Thu, 23 Feb 2017 08:00:00 ESTA radar system is provided that includes a compression component configured to compress blocks of range values to generate compressed blocks of range values, and a radar data memory configured to store compressed blocks of range values generated by the compression component.
Thu, 23 Feb 2017 08:00:00 ESTElevation data obtained from a terrain database is a measurement in an inertial navigation system for land vehicles.
Thu, 23 Feb 2017 08:00:00 ESTThe system provides a global navigation satellite system (GNSS) receiver in a vehicle. The GNSS receiver includes a radio frequency (RF) receiving circuit configured to receive GNSS signals from a plurality of GNSS satellites orbiting Earth at respective azimuth and elevation angles, a memory device storing an predetermined antenna pattern including initial signal to noise ratio (SNR) values for each of the respective azimuth and elevation angles, and a processor. The processor is configured to calculate SNR values of the received GNSS signals, iteratively calculate an updated antenna pattern by combining the calculated SNR values with the initial SNR values, compare further SNR values of further received GNSS signals to the SNR values in the updated antenna pattern to perform at least one of the following: 1) detection and mitigation of multipath signals, 2) estimation of vehicle heading, and 3) determination of a location of the antenna within the vehicle.
Thu, 23 Feb 2017 08:00:00 ESTAn apparatus and method of delivering an alert from an aircraft to a search and rescue system. An alert from an aircraft is received via a communications satellite. The alert comprises identification information identifying the aircraft and position information identifying the position of the aircraft. In response to receiving the alert, an emulated distress radio beacon signal is generated. The emulated distress radio beacon signal comprises the identification information and the position information in a standard format of a signal generated by a distress radio beacon. The emulated distress radio beacon signal is broadcast from a location other than the aircraft as an emulated distress radio beacon transmission that is configured to be received and processed by the search and rescue system.
Thu, 23 Feb 2017 08:00:00 ESTA method and apparatus for tracking the position of an aircraft. A tracking device comprises a satellite navigation system receiver, a satellite communications transceiver, and a processor hermetically sealed within a housing attached on an outside of the aircraft. The satellite navigation system receiver is used to identify the position of the aircraft using navigation signals received from a satellite navigation system. The processor generates position information identifying the position of the aircraft as identified using the navigation system receiver. The processor sends the position information to a receiving station via a communications satellite in a low Earth orbit using the satellite communications transceiver. The position information is automatically generated by the processor and sent to the receiving station at a desired rate.
Thu, 23 Feb 2017 08:00:00 ESTA networked radio frequency identification system includes a plurality of radio frequency identification (RFID) tag readers, a computer in signal communication with the RFID tag readers over a network, and a software module for storage on and operable by the computer that localizes RFID tags based on information received from the RFID tag readers using a network model having endpoints and oriented links. In an additional example, at least one of the RFID tag readers includes an adjustable configuration setting selected from RF signal strength, antenna gain, antenna polarization, and antenna orientation. In a further aspect, the system localizes RFID tags based on hierarchical threshold limit calculations. In an additional aspect, the system controls a locking device associated with an access point based on localization of an authorized RFID tag at the access point and reception of additional authorizing information from an input device.
Thu, 23 Feb 2017 08:00:00 ESTEmbodiments for accurately tracking objects in three-dimensional space by at least one processor device. Inter-device communications are sent between a plurality of stationary radio frequency elements to triangulate a three-dimensional position between the plurality of stationary radio frequency elements and a tracking element registerable to a user, the tracking element also in radio frequency communication with the plurality of stationary radio frequency elements. The tracking element moves, and is tracked by, the plurality of stationary radio frequency elements through the three-dimensional space.
Thu, 16 Feb 2017 08:00:00 ESTThe invention relates to a radar sensor having a printed circuit board which has an electronic circuit and is equipped with electronic components, and having a shielding cover which covers the printed circuit board and the equipment arranged on said printed circuit board, wherein the shielding cover is formed from a printed circuit board material and has a recess which creates space for accommodating the equipment.
Thu, 16 Feb 2017 08:00:00 ESTAn electronic device includes circuitry configured to determine an antenna operation mode for one or more antenna arrays. The circuitry is further configured to control the one or more antenna arrays to operate in a combined antenna mode via a Wilkinson combiner. The circuitry is also configured to control the one or more antenna arrays to operate in an isolated antenna mode via a single-pole, multi-throw switch.
Thu, 16 Feb 2017 08:00:00 ESTThe free space absorber based on an absorbent material containing conductive dipoles dispersing EM waves, includes a conductive substrate reflecting EM waves and a conductive grid located on the surface of the absorber.
Thu, 16 Feb 2017 08:00:00 ESTMethods, systems, and apparatus for real-time control of radio frequency (RF) reflectivity to enable radar camouflage are disclosed. A spatially diverse collection of elements, consisting of at least two elements, are used to control the direction of reradiated (reflected) energy from an object or person where direction of the reradiated energy is controlled by a circuit and a controller. The controller and circuit changes the reflectivity of each element individually as a function of time. The effect of the spatial distribution and time varying reflectors is a reflected RF signal that can statistically mimic background clutter.
Thu, 16 Feb 2017 08:00:00 ESTA street lighting fixture and street lamp used in street lighting containing an accelerometer that is used to detect and characterize acceleration events on a street lighting fixture. The accelerometer readings may be combined with GPS technology to determine a relocation of the street lighting fixture.
Thu, 16 Feb 2017 08:00:00 ESTA system and method for determining transmission delay in a communications system. In some embodiments, satellite positioning information having System Frame Number (SFN) information may be received for a mobile device and observed time difference of arrival (OTDOA) measurements may be received for a mobile device. A location of the mobile device may be determined as a function of the received satellite positioning information. A Global Positioning System (GPS) time estimate may be determined as a function of the determined location of the mobile device. Transmission delay between a node serving the mobile device and an antenna serving the mobile device may be determined as a function of the received OTDOA measurements and determined GPS time estimate.
Thu, 16 Feb 2017 08:00:00 ESTThe invention relates to generating regional tropospheric correction information for correcting observations useful for estimating phase ambiguities and/or a position of global or regional navigation satellite systems (NSS) receiver(s). For each of a plurality of reference stations, at least one troposphere correction parameter is estimated by evaluating NSS observation equations using i) precise satellite information or the information derived from the precise satellite information, and ii) received multiple-frequency-signals-based raw observations or a linear combination thereof. The regional tropospheric correction information is then generated based on the estimated troposphere correction parameter(s) per reference station, the tropospheric correction information comprising a regional tropospheric delay function(s) and coefficients representing a tropospheric delay affecting a NSS signal passing through the troposphere in a region of interest. The generated tropospheric correction information may then be sent to NSS receiver(s) and used by the receiver(s) for example to facilitate position determination.
Thu, 16 Feb 2017 08:00:00 ESTDetermining alignment and clear line-of-sight (LOS) of a satellite antenna using sensor data from an LOS sensor of the satellite antenna. Described techniques include storing first sensor data captured by the LOS sensor at a first time, the first sensor data indicating a first LOS condition of the satellite antenna corresponding to the satellite antenna having a beam LOS with a satellite of the satellite communication system that is aligned and unobstructed. The techniques may include receiving second sensor data captured by the LOS sensor at a second time after the first time, the second sensor data indicating a second LOS condition of the satellite antenna. The techniques may include determining an LOS condition change for the satellite antenna between the first time and the second time based on a comparison of the second sensor data with the first sensor data.
Thu, 16 Feb 2017 08:00:00 ESTAn electronic apparatus includes a processing unit that presents either or both of indexes and evaluations regarding physical activity of a user causing a directional change by using movement direction information of the user calculated on the basis of a satellite signal.
Thu, 16 Feb 2017 08:00:00 ESTThe present disclosure provides a satellite positioning device which includes a first short-distance transceiver module and a first satellite positioning device. The first short-distance transceiver module is configured to wirelessly connect to a second short-distance transceiver module of an electronic device, and to receive satellite positioning information from the second short-distance transceiver module. The first satellite positioning module is electrically coupled to the first short-distance transceiver module and is configured to receive at least one satellite signal. The first satellite positioning module generates a first satellite positioning result according to the at least one satellite signal and the satellite positioning information received by the first short-distance transceiver module.
Thu, 16 Feb 2017 08:00:00 ESTA GPS positioning method for a mobile terminal, and a mobile terminal are provided. The method includes: after GPS positioning is started, acquiring a first cell identifier of a first cell in which the mobile terminal is located; acquiring, according to the first cell identifier, first latitude and longitude information corresponding to the first cell identifier from a correspondence table stored on the mobile terminal, where the correspondence table includes a cell identifier and latitude and longitude information corresponding to the cell identifier; and with reference to the first latitude and longitude information, and time information and ephemeris information that are acquired in advance, performing GPS positioning on the mobile terminal by using a GPS receiver of the mobile terminal.
Thu, 16 Feb 2017 08:00:00 ESTThe present invention provides a method for detecting an object, said method comprising: providing a plurality of nonrotating transmitting and receiving antennas at a location; transmitting an electromagnetic waveform from each of said plurality of nonrotating transmitting antennas for reflection from an object to be detected, each of said waveforms chosen so as to avoid interference with the other waveforms between transmitted signals and received signals; receiving reflected electromagnetic echo signals by the receiving antennas from the object to be detected and generating receiving signals corresponding to the echo signals; processing the receiving signals to determine relative location information about the object to be detected.
Thu, 16 Feb 2017 08:00:00 ESTA target detection apparatus includes a target detection means, a depth determination value calculation means, a crossing over determination means, an attention information setting means, a tracking means, a transfer determination value calculation means, and an attention information cancelling means. The depth determination value calculation means determines a depth determination value indicating the depth of a target. The crossing over determination means determines whether the target can be crossed over by the vehicle. The attention information setting means sets attention information indicating that the target needs to be paid attention. The tracking means determines a connection relationship between a current-cycle target and a previous-cycle target and cause the current-cycle target having a connection relationship, to take over information relating to the previous-cycle target. The transfer determination value calculation means determines a transfer determination value, for each target. The attention information cancelling means cancels the setting of the attention information.
Thu, 16 Feb 2017 08:00:00 ESTCalibrating an antenna diagram of a MIMO radar sensor, including: before commissioning: storing an antenna diagram that associates with each of several angles a respective control vector that is made up of a transmitting control vector and a receiving control vector; after commissioning: performing a radar measurement to localize an object; checking whether the localized object is a single target or a multiple target; if single: performing a SIMO measurement with each of the transmitting antenna elements; estimating the angle of the object based on the measurement results; calculating a first comparison variable, dependent on the components of the transmitting control vector, for each transmitting antenna element; calculating a second comparison variable, dependent on the results of the SIMO measurements, for each transmitting antenna element; and correcting the transmitting control vector based on a known relationship between the first and second comparison variables for each transmitting antenna element.
Thu, 16 Feb 2017 08:00:00 ESTGenerally discussed herein are systems, apparatuses, and methods for generating a replica of a first signal with a notch at one or more desired frequencies. In an example, an apparatus can include a pulse cataloger configured to analyze the first signal and to provide phase modulation information about the first signal, a direct digital synthesizer having an output and configured to modulate a second signal using the phase modulation information and to provide the second signal at the output. The second signal can include a representation of the first signal with a frequency notch at a particular center frequency within the bandwidth of the second signal.
Thu, 16 Feb 2017 08:00:00 ESTThe disclosure provides a radar apparatus. The radar apparatus includes a transmit unit that generates a first signal in response to a reference clock and a feedback clock. The first signal is scattered by one or more obstacles to generate a second signal. A receive unit receives the second signal and generates N samples corresponding to the second signal. N is an integer. A conditioning circuit is coupled to the transmit unit and the receive unit. The conditioning circuit receives the N samples corresponding to the second signal, and generates N new samples using an error between the feedback clock and the reference clock.
Thu, 16 Feb 2017 08:00:00 ESTAn embodiment relates to a method for processing radar signals. The radar signals may include digitized data received by at least two radar antennas. The method may include determining CFAR results on FFT results based on data received by a first antenna, and applying the CFAR results to FFT results based on data received by a second antenna.
Thu, 16 Feb 2017 08:00:00 ESTThe invention relates to a device and a method for determining whether a living person has been buried in collapsed ground. The device consists of a rod provided with a receiver unit and a signal processing unit. The receiver unit is intended to receive reflected radar signals transmitted form a radar transmitting antenna and transfer these signals to the signal processing unit. The signal processing unit which is provided with specific detection units determines whether the received signal have been Doppler shifted. By determining this the device can decide whether the Doppler shift depends on the moving chest of a breathing person buried alive.
Thu, 09 Feb 2017 08:00:00 ESTA universal transmit-receive (UTR) module for phased array systems comprises an antenna element shared for both transmitting and receiving; a transmit path that includes a transmit-path phase shifter, a driver, a switch-mode power amplifier (SMPA) that is configured to be driven by the driver, and a dynamic power supply (DPS) that generates and supplies a DPS voltage to the power supply port of the SMPA; and a receive path that includes a TX/RX switch that determines whether the receive path is electrically connected to or electrically isolated from the antenna element, a bandpass filter (BPF) that aligns with the intended receive frequency and serves to suppress reflected transmit signals and reverse signals, an adjustable-gain low-noise amplifier (LNA), and a receive-path phase shifter. The UTR module is specially designed for operation in phased array systems. The versatility and wideband agility of the UTR module allows a single phased array system to be designed that can be used for multiple purposes, such as, for example, both radar and communications applications.
Thu, 09 Feb 2017 08:00:00 ESTA hybrid active array approach can combine aspects of a passive and active array architecture with transmitter, high power, and cooling components positioned in one location, e.g., below a ship deck, apart from a radiating location. Waveguides or signal transmission lines can convey a transmit signal from the transmitter to the radiating location, e.g., to a beamforming network (BFN), hybrid transmit/receive modules (HTRM), and a plurality of antenna elements. The exemplary BFN can set an amplitude distribution of an antenna aperture associated with the BFN, HTRMs, and plurality of antenna elements to control both transmit and receive sidelobes where low or reduced sidelobes on transmit reduces radiation outside of the main beam further reducing signal returns in one or more sidelobes sections of the antenna elements. In a receive mode, a reverse can occur and additional beamformers can be utilized for beamforming the receive beams.
Thu, 09 Feb 2017 08:00:00 ESTProvided is a positioning terminal of a global navigation satellite system configured to: receive a plurality of navigation signals and an augmentation signal from a plurality of navigation satellites and an augmentation satellite; acquire, in a process of causing each value of error causes including an ambiguity to converge through a plurality of times of observation to enhance an accuracy of positioning through continuous observation, each value of a position of the positioning terminal recorded in advance in a storage area to calculate each value of the error cause, and use the calculated each value as an initial value and/or one value to be added for the continuous observation to cause each value of the error cause to converge; and successively perform positioning calculation.
Thu, 09 Feb 2017 08:00:00 ESTA method of dividing a satellite signal into eight frequency points for processing includes the following steps: amplifying a satellite signal received by an antenna (SI); dividing the amplified satellite signal into radio frequency signals that includes eight frequency points in total, GPSL1, GPSL2, GPSL5, BDB1, BDB2, BDB3, GLNL1, and GLNL2, by a power divider circuit (S2); conducting a frequency mixing processing on five signals GPSL2, CPSL5, BDB2, BDB3, and GLNL2, and filtering the radio frequency signals that include eight frequency points in total, which include five frequency-mixed signals, GPSL2, GPSL5, BDB2, BDB3, and GLNL2, and three unmixed signals, GPS1, BDB1, and GN1 (S3); down-converting and A/D converting filtered eight-frequency-point radio frequency signals, outputting the signals to a baseband portion for a baseband signal processing (S4). This method reduces the power consumption, the size and the cost of the hardware.
Thu, 09 Feb 2017 08:00:00 ESTSensing, in particular a generic and innovative search and identification of objects in an arena, of interest based on electromagnetic detection and/or imaging, self-focused, in the near field, with high range resolution, cross-range resolution, nearby arenas functionality, high range resolution, and accuracies, as compared to conventional solutions. Larger volume arenas can be searched with greater range resolution, accuracy, and cross range resolution as compared to conventional solutions. Embodiments include implementations sufficiently low power to be acceptable for use in human applications (for example, meeting HERP standards).
Thu, 09 Feb 2017 08:00:00 ESTA method (400) and a 3D camera (110) for a vehicle for detecting an object (130) in an area (140) for collecting (401) measurement data related to the area (140) by a sensor (310) in the 3D camera (110) using a first sensor setting, in addition, reception (402) of measurement data related to the area (140) from a radar (120), and detection (405) of the object (130) based on interpretation of collected (401) measurement data by the camera together with measurement data received (402) from the radar (120).
Thu, 09 Feb 2017 08:00:00 ESTMethod and apparatus for tracking pulse trains from one or more emitters. For a valid pulse. PRI parameters are measured. A pulse pattern count is incremented and checked to determine if a track is acquired for the emitter.
Thu, 09 Feb 2017 08:00:00 ESTSystems, methods, and devices of the present invention use a single Pseudo Noise (PN) code to modulate multiple orthogonal carriers by Binary Phase Shift Keying (BPSK) modulation. The various embodiments enable closely spaced carriers to be modulated with the same periodic PN sequence using BPSK modulation. In this manner, even though the carriers may almost entirely share bandwidth, orthogonality of the carriers may not be lost, enabling the various embodiments to be used with limited bandwidth Intensity Modulated Continuous Wave (IM-CW) Light detection and ranging (Lidar), Radio detection and ranging (Radar), or Sound Navigation and Ranging (Sonar) systems. Additionally, by using orthogonal carriers the various embodiments enable measurements to be made simultaneously, thereby reducing the error compared to systems that require sequential measurements, such as pulsed Lidar systems.
Thu, 09 Feb 2017 08:00:00 ESTA near-field plate is a non-periodically patterned surface that can overcome the diffraction limit and confine electromagnetic fields to subwavelength dimensions. By controlling the interference of the electromagnetic fields radiated by the near-field plate with that of a source, the near-field plate can form a subwavelength near-field pattern in a forward direction, while suppressing fields in other directions, such as those reflected. The resulting unidirectional near-field plate may find utility in many applications such as high resolution imaging and probing, high density data storage, biomedical targeting devices, and wireless power transfer.
Thu, 09 Feb 2017 08:00:00 ESTIn one example, this disclosure is directed to a system configured to receive weather data from one or more weather data sources. The system is further configured to receive, from a requesting weather radar system, a request for supplemental weather data covering an identified region, wherein the requesting weather radar system is associated with a specific weather radar data format. The system is further configured to identify a set of supplemental weather data for the identified region, based on the received weather data from the one or more weather data sources, wherein the supplemental weather data is in the specific weather radar data format associated with the requesting weather radar system and comprises weather forecast information for the identified region. The system is further configured to transmit the supplemental weather data for the identified region to the requesting weather radar system.
Thu, 09 Feb 2017 08:00:00 ESTIn selected embodiments, a process of geolocation of a transmitter uses a receiver with an antenna array that is non-line-of-sight (NLoS) to the transmitter. A first plurality of scatterers within line-of-sight (LoS) of the array is located using multilateration based on time difference of arrival (TDoA) from the first scatterers, and applying a spatial consistency requirement. Time of emission/reflection from the first scatterers is also determined. The coordinates and timing of the first scatterers are used to locate either the transmitter or another set of scatterers, by applying multilateration to the TDoA at the first scatterers, and applying the spatial consistency requirement. The process is iteratively repeated until the transmitter is identified. The multilateration may be linearized without sacrificing precision. In each iteration, a non-singularity requirement is applied to ensure that the selected scatterers produce unambiguous results.
Thu, 09 Feb 2017 08:00:00 ESTA ranging and tracking system and method employs a Coherent Array Reconciliation Tomography (CART) approach that benefits from a series of samples gathered from deployed receivers in an area of interest, and applies a sequence of matrix operations and transformations to data defining locations in a Cartesian grid space for summing constructive characteristics in a received waveform for identifying a leading edge indicative of a time of arrival (TOA) from a signal source, and computing a metric based on the distance to the signal source. Sampled waveform information (data) from multiple locations in the area of interest allows computation of a likelihood metric for each location in the grid space of containing the signal source. Rendering of the grid space location having the highest likelihood metric illustrates a position of the signal source, and may be graphically depicted clustering of the locations depicting a high likelihood.
Thu, 09 Feb 2017 08:00:00 ESTDevice (1) for manually measuring the frequency of vibrations on a tight drive belt (6, 6′, 6″), comprising a Doppler radar module (3) which uses a transmit antenna (4) for emitting a transmit beam (8) onto a vibrating surface of the drive belt (6, 6′, 6″) as well as a receive antenna (5) for receiving the receive beam (9) reflected by the surface and evaluates the receive beam (9) according to the Doppler principle, the vibration sensor (1) also comprising an acceleration sensor (10) in addition to the Doppler radar module (3), the signals of the acceleration sensor (10) being calculated along with the signals of the Doppler radar module, thus allowing some signals to be disregarded.
Thu, 02 Feb 2017 08:00:00 ESTAn antenna array includes a first antenna disposed on a micro strip and oriented along a first axis in a first direction, a second antenna disposed on the micro strip and oriented along a second axis in the first direction, a third antenna disposed on the micro strip and oriented along the first axis in a second direction opposite the first direction and a fourth antenna disposed on the micro strip and oriented along the second axis in the second direction. The antenna array further includes a phase shifter connected to at least one of the antennas.
Thu, 02 Feb 2017 08:00:00 ESTA method for active interference avoidance in unlicensed bands. The method includes receiving an electromagnetic signal having a transmission frequency, a transmission period, and an antenna pattern from a phased array antenna. The method also includes switching the transmission frequency from a first transmission frequency with a first signal to interference and noise ratio to a second transmission frequency with a second signal to interference and noise ratio, wherein the second signal to interference and noise ratio is lower than the first signal to interference and noise ratio. The method further includes selecting a transmission period based on a time when a least amount of signal noise is present on the transmission frequency and selecting an antenna pattern that reduces interference on the selected transmission frequency.
Thu, 02 Feb 2017 08:00:00 ESTDisclosed embodiments pertain to a method on a UE may comprise determining a first absolute position of the UE at a first time based on GNSS measurements from a set of satellites. At a second time subsequent to the first time, the UE may determine a first estimate of displacement of the UE relative to the first absolute position using non-GNSS measurements. Further, at the second time, the UE may also determine a second estimate of displacement relative to the first absolute position and/or a second absolute position of the UE based, in part, on: the GNSS carrier phase measurements at the first time from the set of satellites, and GNSS carrier phase measurements at the second time from a subset comprising two or more satellites of the set of satellites, and the first estimate of displacement of the UE.
Thu, 02 Feb 2017 08:00:00 ESTA distance measuring device and method are disclosed for use on a golf course. A satellite navigation system receiver determines a user's location. A database containing stored coordinates is accessed by a processor to determine a golf course and a hole associated with the location and a maximum and a minimum distance from the location to a green containing the hole. A laser rangefinder determines a distance between the location and each of a plurality of objects. The processor discards object distances which are not within the perimeter of the green. Optionally, an accelerometer and a gyrometer are used to more precisely determine a heading of the laser pulse for each object distance. The processor establishes from the stored coordinates a cone of interest originating at the location and extending to the green, and discards object distances which do not have headings within the cone of interest. The retained distance may be displayed for the user.
Thu, 02 Feb 2017 08:00:00 ESTA method is provided for aligning RF signals of a first channel bank and additional channel banks in a test platform. A plurality of correlators is used to correlate a reference code signal carrying a particular code at a particular chip rate with a received code signal carrying the particular code at the particular chip rate from the first channel bank to establish a first timing offset. The plurality of correlators is used to correlate a continuation of the reference code signal with additional received code signals carrying the particular code at the particular chip rate from the additional channel banks to establish additional timing offsets. The first timing offset and additional timing offsets are applied to the first and additional channel banks. The plurality of correlators includes at least 12 correlators, and a timing offset is established in a correlation interval having a shorter duration than the particular code.
Thu, 02 Feb 2017 08:00:00 ESTA radio navigation system (100; 400), comprising a plurality of satellite-borne transmitters (110, 114, 118, 122) and at least one ground-based receiver (104), the receiver (104) being adapted to receive radionavigation signals (112, 116, 120, 124; 412, 416, 420, 424) from each of a plurality of the transmitters (110, 114, 118, 122). Each of the transmitters (110, 114, 118, 122) and the receiver (104) being adapted to access a predetermined first key chain, the first key chain comprising a first encryption key (K; Kj) and one or more further encryption keys (K; Kj,1, Kj,2, Kj,3, Kj,4). The system may comprise a first group of transmitters from said plurality of transmitters (110, 114, 118, 122), each transmitter in the first group of transmitters being operable to transmit a first radio navigation signal (112, 116, 120, 124; 412, 416, 420, 424), the first radionavigation signals including, at a given instant or for a given subframe (k, k+1), radionavigation data, a MAC (MAC1, MAC2, MAC3, MAC4), and one of said one or more further encryption keys (K; Kj,1, Kj,2, Kj,3, Kj,4). The MAC code (MAC1, MAC2, MAC3, MAC 4) is unique to each transmitter (110, 114, 118, 122) and is generated using the first encryption key (K; Kj,) and the one of said one or more further encryption keys (K; Kj,1, Kj,2, Kj,3, Kj,4) is transmitted a predetermined time after transmission of the MAC. The receiver (104) is operable, upon receipt of all or part of the first radionavigation signal (112, 116, 120, 124; 412, 416, 420, 424) from one or more of the first group of transmitters (110, 114, 118, 122), to authenticate a first radionavigation signal received from one of the first group of transmitters based on one of said one or more further encryption keys (K; Kj,1, Kj,2, Kj,3, Kj,4) received from that transmitter or from any other transmitter in said first group of transmitters. The same key K may be used for all transmitters in the first group, or each transmitter may use different key from the key chain. The transmitters may be formed into a second group, in addition to the first, with the second group using its own key chain in a similar manner. An advantage is to increase the availability of an authenticated position even in degraded reception environments. Embodiments also relate to the optimal transmission of authentication information—though the use of unpredictable bits interleaved with predictable bits—so as to minimize the signal predictability time and the increase of robustness against replay attacks.
Thu, 02 Feb 2017 08:00:00 ESTA pay television satellite broadcast includes validation data that can be used to validate authenticity of live global positioning system (GPS) data. The validation data may be included within entitlement messages and encrypted for security and selective reception by authorized receivers. A navigation system may compute checksums of received live GPS data and compare with the validation data for a match. A decision about whether or not to use the live GPS data may be taken based on whether or not the computed checksums match the validation data received via the pay television satellite broadcast signals.
Thu, 02 Feb 2017 08:00:00 ESTAn exemplary method includes a monitoring system identifying a time period during which a vehicle equipped with a tracking device travels at least a threshold distance, determining that the tracking device fails to acquire a desired signal for a predetermined amount of time during the time period, and determining, based on the determining that the tracking device fails to acquire the desired signal for the predetermined amount of time during the time period, that the tracking device is potentially being interfered with during the time period. Corresponding systems and methods are also described.
Thu, 02 Feb 2017 08:00:00 ESTA moving object detection apparatus is configured to calculate, based on detection information of an object from a radar sensor, a moving direction of the object with respect to a host vehicle to generate object information, the object information including information representing the calculated moving direction; set an invalidation time period or an invalidation section; and prevent a calculation of the moving direction during a period from the detection start timing to an invalidation end timing, the invalidation end timing being at a lapse of the invalidation time period or a timing when the object exists from the invalidation section, or prevent the moving direction calculated by the object information generating part from being used in a drive support control during the period from the detection start timing to the invalidation end timing.
Thu, 02 Feb 2017 08:00:00 ESTA target tracking device transmits a radio frequency beam towards a scene, detects backscatter comprising at least a portion of the RF beam reflected from a reflecting object at the scene, and performs operations that include determining whether the reflecting object is a tracking target, determining a position of the tracking target, and generating tracking information indicative of a position adjustment for maintaining an alignment of the target tracking device and the tracking target. A target tracking method includes transmitting a millimeter wavelength beam in a direction of orientation of a camera, detecting backscatter reflected from a reflecting object, determining whether the reflecting object is a tracking target, and determining a position of the tracking target. If a distance to the tracking target has increased from a prior distance, tracking information indicative of a position adjustment for offsetting the increase in distance may be generated.
Thu, 02 Feb 2017 08:00:00 ESTMinimizing incorrect associations of sensor data for an autonomous vehicle are described. A driving environment of the autonomous vehicle includes a stationary object and a dynamic object. Such objects can be detected by radar sensors and/or lidar sensors. In one example, a history of radar observation can be used to minimize incorrect sensor data associations. In such case, the location of a stationary object in the driving environment can be determined. When a dynamic object passes by the stationary object, lidar data of the dynamic object is prevented from being associated with radar data obtained substantially at the determined location of the stationary object. In another example, identifiers assigned to radar data can be used to minimize incorrect sensor data associations. In such case, lidar data of an object can be associated with radar data having a particular identifier.
Thu, 02 Feb 2017 08:00:00 ESTFor a set-up for measuring a rotational speed of a turbocharger of a motor vehicle, including at least one antenna for generating and/or receiving electromagnetic radiation and an electronic module having at least one electric and/or electronic component and being electrically connected to the antenna. The set-up further includes a housing shell made at least partially of laser-absorbing material and having an inner chamber, and a housing cover, which rests on at least one laser-absorbing contact surface of the housing shell and covers the inner chamber of the housing shell at least partially, and at least sections of which are made of material transparent to laser radiation; the antenna and the electronic module being situated in the inner chamber of the housing shell, and at least sections of the housing cover being welded to the housing shell at the at least one contact surface using a laser-welded seam.