Abstract: A vehicle, radar system for a vehicle and method of estimating a cross-transmission range of an object. The radar system includes a first radar, a second radar and a processor. The first radar transmits a test signal. The second radar is separated from the first radar by a selected distance and receive a total signal that includes the test signal received directly from the first radar and a reflection of the test signal from the target. The processor performs a non-linear operation on the total signal to obtain a cross-correlation term of the directly received test signal and the reflection signal, and estimate a cross-transmission range of the object from the cross-correlation term.

Abstract: A vehicle, system and method of estimating a velocity of an object with respect to the vehicle is disclosed. The system includes a plurality of radars associated with the vehicle and a processor. The plurality of radars provide a coarse estimate of the velocity. The processor obtains a plurality of velocity hypotheses based on the coarse estimate of the velocity of the object, determines a likelihood for each of the plurality of velocity hypotheses, and chooses a velocity hypothesis having as the estimate of velocity based on the determined likelihood.

Abstract: A vehicle, a radar system for the vehicle, and method of driving the vehicle. A radar array having plurality of radar nodes is arranged along the vehicle. Each radar node includes a first transmitter at one end of the node, a second transmitter at a second end of the node and a plurality of receivers aligned between the first transmitter and the second transmitter. At least one of an aperture length of the nodes and a spacing between the nodes is a variable parameter. A processor activates a transmitter of the radar array to generate a test pulse, receive, at a receiver of the radar array, a reflection of the test pulse from an object, and determines an angular location of the object from the reflection of the test pulse. A trajectory of the vehicle can be changed using the determined angular location of the object.

Abstract: A radar system includes two or more nodes. Each node includes one or more transmit antennas and one or more receive antennas. The radar system also includes a processor to obtain received signals at each of the two or more nodes, estimate an angle of arrival of each target identified based on the received signals, estimate an offset of each of the two or more nodes from a known location, and compensate for the offsets in the process of estimating the angle of arrival for subsequent targets in the received signals.

Abstract: A radar system and method for calibrating a radar system, the method including the steps of: measuring a set of azimuth angles of the radar system to obtain a plurality of measured azimuth array responses, wherein the radar system is physically rotated about a first axis of the radar system between each azimuth angle measurement; measuring a set of elevation angles of the radar system to obtain a plurality of measured elevation array responses, wherein the radar system is physically rotated about a second axis of the radar system between each elevation angle measurement; obtaining an azimuth calibration matrix based on the plurality of measured azimuth array responses and an elevation calibration matrix based on the plurality of measured elevation array responses; and configuring the radar system to apply the azimuth calibration matrix and the elevation calibration matrix to one or more antenna array responses.

Abstract: A method is disclosed for determining an angle of arrival of an incident plane wave received by an antenna array. The method includes receiving signals from a plurality of antenna receiving channels, determining a set of possible angles of arrival of the incident plane wave based on the signals received at the plurality of receiving channels, measuring a pulse delay of the incident plane wave between the signals received at the plurality of receiving channels, and calculating the angle of arrival of the incident plane wave based on the set of possible angles of arrival and the measured pulse delay.

Abstract: A system and method generate a signal for transmission by a radar system. A bit modulator outputs a bit of a binary code. A digital frequency controller outputs a range of frequencies. An order of the range of frequencies is based on the bit. A phase-locked loop generates a signal for transmission by the radar system. The signal includes a chirp comprising the range of frequencies in the order output by the digital frequency controller.

Abstract: A radar system and a method to configure the radar system involve one or more transmit antennas to transmit a radio frequency signal, and one or more receive antennas to receive reflected energy based on the radio frequency signal transmitted by the one or more transmit antennas. The one or more transmit antennas and the one or more receive antennas are arranged in an array. A processor jointly determines a spacing among the one or more transmit antennas and the one or more receive antennas arranged in the array and a mapping between data obtained by the one or more receive antennas and an angle of arrival of one or more targets detected in the data. Joint determination refers to both determination of the spacing being in consideration of the mapping and determination of the mapping being in consideration of the spacing.

Abstract: Embodiments include methods, systems and computer readable storage medium for geo-location based transmission resource allocation for vehicle sensors. The method includes determining available transmission resources for an area and partitioning the area into a plurality of cells. The method includes determining whether the plurality of cells exceeds the available transmission resources and allocating a portion of the available resources to a first set of one or more cells. The method includes reusing the portion of the available resources allocated to the first set of one or more cells by allocating the portion of the available resources to a second set of one or more cells and assigning transmission resources associated with the second set of one or more cells to a second set of one or more vehicles when the second set of one or more vehicles enters an area associated with the second set of one or more cells.

Abstract: A radar system and method of detecting an object involve a first node including a first transmitter and a first receiver, and a second node including a second transmitter and a second receiver. The second receiver receives a first received signal from an object from a first transmission by the first transmitter, the first received signal including first phase noise with a first delay, and the first receiver receives a second received signal from the object from a second transmission by the second transmitter, the second received signal including second phase noise with a second delay. A processor processes the first transmission, the first received signal, the second transmission, and the second received signal to eliminate the inter-node phase noise and to estimate a location of the object relative to the radar system based on the first delay and the second delay.

Abstract: A vehicle radar system and calibration method that provide for system calibration so that target object parameters can be calculated with improved accuracy. Generally speaking, the calibration method uses a number of hypothesized calibration matrices, which represent educated guesses for possible system or array calibrations, to obtain a number of beamforming images. A blurring metric is then derived for each beamforming image, where the blurring metric is generally representative of the quality or resolution of the beamforming image. The method then selects hypothesized calibration matrices based on their blurring metrics, where the selected matrices are associated with the blurring metrics having the best beamforming image resolution (e.g., the least amount of image blurriness). The selected hypothesized calibration matrices are then used to generate new calibration matrices, which in turn can be used to calibrate the vehicle radar system so that more accurate target object parameters can be obtained.

Abstract: Assemblies, systems and devices for reducing a gap between physical antennas on multiple printed circuit boards (PCBs) are provided.

Abstract: A radar system and method of detecting an object involve a first node including a first transmitter and a first receiver, and a second node including a second transmitter and a second receiver. The second receiver receives a first received signal from an object from a first transmission by the first transmitter, the first received signal including first phase noise with a first delay, and the first receiver receives a second received signal from the object from a second transmission by the second transmitter, the second received signal including second phase noise with a second delay. A processor processes the first transmission, the first received signal, the second transmission, and the second received signal to eliminate the inter-node phase noise and to estimate a location of the object relative to the radar system based on the first delay and the second delay.

Abstract: A system and method to separate close targets includes transmitting a pulse sequence and detecting a first target at a first target Doppler frequency based on processed received reflections resulting from the pulse sequence. A nulling pulse sequence designed to null the processed received reflections at the target Doppler frequency is transmitted.

Abstract: A vehicle, driving system and method for driving a vehicle is disclosed. The driving system includes a radar system, a processor and an autonomous driving system. The radar system obtains an SAR measurement of a static object in an environment of the vehicle. The processor obtains a first estimate of a location of the vehicle in the environment, obtains from a database a representation of a static object in the environment associated with the first estimate of the location, and compares the SAR measurement of the static object to the representation of the static object from the database to obtain a second estimate of the location of the vehicle. The autonomous driving system drives the vehicle through the environment based on the second estimate of the location of the vehicle.

Abstract: The present application generally relates communications and hazard avoidance within a monitored driving environment. More specifically, the application teaches a system and method for improved target object detection in a vehicle equipped with a laser detection and ranging LIDAR system by transmitting a light pulse for a known duration and comparing a duration of the received pulse to the transmitted pulse in order to determine an orientation of a surface of a target.

Abstract: A system and method for resolving a first target from a second target by radar is disclosed. The system includes a transmitter for transmitting a source signal, a receiver for receiving first and second echo signals from reflection of the source signal from at least a first target and a second target, respectively. A processor is used to subtract the first echo signal from the composite signal to obtain a second generation of the second echo signal, subtract the second generation of the second echo signal from the composite signal to obtain a second generation of the first echo signal, and estimate a parameter value for the first target from the second generation of the first echo signal and a parameter value for the second target from the second generation of the second echo signal.

Abstract: A vehicle radar system, such as a multiple input multiple output (MIMO) radar system, for estimating a Doppler frequency shift and a method of using the same. In one example, a modulated signal is mixed with an orthogonal code sequence and is transmitted by a transmit antenna array with a plurality of transmitting antennas. The signals reflect off of a target object and are received by a receive antenna array with a plurality of receiving antennas. Each of the received signals, which likely includes a Doppler frequency shift, is processed and mixed with a number of frequency shift hypotheses that are intended to offset the Doppler frequency shift and result in a series of correlation values. The frequency shift hypothesis with the highest correlation value is selected and used to correct for the Doppler frequency shift so that more accurate target object parameters, such as velocity, can be obtained.

Abstract: A method is disclosed for optimizing an angular resolution across a field-of view for an antenna array having a plurality of antenna elements positioned along a curved surface. The method includes selecting a position along the curved surface for a first antenna element in the plurality of antenna elements and calculating subsequent positions for each of the remaining plurality of antenna elements on the antenna array, wherein the subsequent positions are determined relative to the position of the first antenna element and wherein the subsequent positions represent positions at which a maximum angular resolution is achieved for all angles in the field-of-view.

Abstract: Methods and systems are provided for controlling a radar system of a vehicle. One or more transmitters are configured to transmit radar signals. A plurality of antennas or arrays are configured to receive return radar signals from the transmitting and other transmitting antennas after the transmitted radar signals are deflected from an object proximate the vehicle. A processor is coupled combined the various observation vectors into a virtual observation vector terminating at a single observation point.