Abstract: A system, method and apparatus for detecting a plurality of targets in a radar device are disclosed. A transmitter transmits a source signal and a receiver receives echo signals from reflection of the source signal from the plurality of targets. A composite signal is generated that includes a plurality of target signals from the plurality of echo signals. A largest signal in the composite signal is identified and a value of a parameter of the largest signal is estimated. A representative signal is generated as a convolution of a point target having the estimated value of the parameter. The representative signal is subtracted from the composite signal to obtain a remaining signal. Another of the plurality of targets is determined using the remaining signal.

Abstract: A wave transmitted by an antenna made up of an array of radiating elements, two pulse waves are transmitted, each modulated by a phase shift law known as modulation phase shift, the phase shifts being in opposition, a first wave being transmitted by a sub-array of radiating elements referred to as odd and the second wave being transmitted by a second sub-array of radiating elements referred to as even, the two sub-arrays being interleaved, the transmitted wave being the combination of the first wave and the second wave.

Abstract: The present invention is directed to a method for processing radar signals in a distributed array radar that includes a first airborne platform and at least one second airborne platform. Doppler filtered radar return samples are obtained and a weight value is calculated as a function of first clutter signals and second clutter signals. The weight value is employed in a weight vector that is computed, as well, from a steering vector that need not be matched to the target vector. The weight vector is applied to a signal vector corresponding to the Doppler filtered radar return samples. An open loop feedback is implemented and configured to create beam pattern nulls at angles corresponding to the plurality of first interference signals within each of the Doppler bins without substantially tracking a position or velocity of the first airborne platform or the at least one second airborne platform.

Abstract: Systems and methods for measuring velocity and acceleration with a radar altimeter. In certain embodiments, a method for measuring velocity magnitude of a platform in relation to a surface includes transmitting a radar beam, wherein the radar beam is aimed toward a surface. The method also includes receiving a plurality of reflected signals, wherein the plurality of reflected signals correspond to portions of the transmitted radar beam that are reflected by a plurality of portions of the surface. Further, the method includes applying Doppler filtering to the plurality of signals to form at least one Doppler beam. Also, the method includes identifying range measurements within each Doppler beam in the at least one Doppler beam. The method further includes calculating one or more coefficients of the Taylor expansion of the velocity magnitude based on the range measurements of the at least one Doppler beam.

Abstract: A method, system and computer program product for computing a target distance estimate using a wireless device. A waveform is transmitted to an object (e.g., automobile) by a wireless device. Reflections of the waveform are then received, such as on two forward directional antennas. A channel impulse response (e.g., a frequency-domain channel impulse response) is then obtained from the reflections. A parameterized function is applied to the channel impulse response. Parameters of the parameterized function are fitted to measure the channel impulse response. A distance to the object is then estimated based on the fitted parameters. In this manner, by operating wireless devices as radar devices, a higher accuracy in target range estimates can be achieved with less spectrum bandwidth when compared to standard radar waveforms with standard radar processing. Furthermore, by utilizing wireless devices as opposed to radar devices, the cost problem associated with radar is addressed.

Abstract: The present invention relates to a method for removing a noise tone in a digital region of an imaging radar receiver, an imaging radar receiver therefor, and a program recording medium. A method for removing a noise tone in a digital region of an imaging radar receiver using a D-ramping structure according to an embodiment of the present invention is characterized by comprising the steps of: (a) extracting a noise tone location of a D-ramped image signal; (b) selecting a noise tone to be removed from the extracted noise tones using step (a); and (c) removing the selected noise tone of step (b) from source data.

Abstract: A frequency generator includes two voltage controlled oscillators, which have a plurality of switchable sub-bands, each, and which are designed to produce respective frequency signals, wherein a switching from one sub-band to a neighboring sub-band occurs at predetermined switching locations. The sub-bands of the second oscillator are arranged offset in frequency relative to the sub-bands of the first oscillator. The frequency generator includes an electronic switch element, which is designed to switch either the first or the second frequency signal through to the output of the electronic switch element, and to switch the switch element such that during the producing of the frequency ramp alternately either the first or the second frequency signal is switched through to the output. When at one of the oscillators the switching between two neighboring sub-bands is occurring, the frequency signal produced by the other oscillator is switched through to the output.

Abstract: A configuration is provided with: a local oscillator 3 which generates M local oscillation signals Lm(t) whose frequencies differ from one another by an integral multiple of an angular frequency ?; receiver devices 4-m each converting the frequency of a received signal Rxm(t) of one antenna element 2-m using one local oscillation signal Lm(t) generated by the local oscillator 3, thereby generating a received video signal Vm(t) having an antenna element number m; an adder 5 which adds the received video signals V1(t) to VM(t) generated by the receiver devices 4-1 to 4-M, and outputs a received video signal Vsum(t) after addition; and an A/D converter 6 which A/D-converts the received video signal Vsum(t) outputted from the adder 5, thereby to generate a received video signal V(n) which is a digital signal.

Abstract: An optical flow sensing method includes: using an image sensor to capture images; using a directional-invariant filter device upon at least one first block of the first image to process values of pixels of the at least one first block of the first image, to generate a first filtered block image; using the first directional-invariant filter device upon at least one first block of the second image to process values of pixels of the at least one first block of the second image, to generate a second filtered block image; comparing the filtered block images to calculate a correlation result; and estimating a motion vector according to a plurality of correlation results.

Abstract: A radar sensing system for a vehicle includes transmit and receive pipelines. The transmit pipeline includes transmitters able to transmit radio signals. The receive pipeline includes receivers able to receive radio signals. The received radio signals include transmitted radio signals that are reflected from an object. The transmitters phase modulate the radio signals before transmission, as defined by a first binary sequence. The receive pipeline comprises at least one analog to digital converter (ADC) for sampling the received radio signals. The first binary sequence is defined by least significant bit (LSB) outputs from the at least one ADC.

Abstract: A radar is equipped with a main antenna having three radiation patterns, sum, difference and control, corresponding to the antenna, the radar comprises an auxiliary antennal device, composed of an antenna and of a rear radiating element which is situated at the rear of the antenna, fixed above the antenna and coupling means, the auxiliary antennal device: having three radiation patterns, sum, difference and control, the control pattern ensured for the direction opposite to the antenna by the rear radiating element; the antenna inclined to guarantee a maximum gain of its sum pattern in the elevational domain (60°-90°).

Abstract: A system and method for obtaining a Doppler frequency of a target are disclosed. A receiver receives a first plurality of samples of a first echo signal from the target and a second plurality of samples of a second echo signal from the target. The second plurality of samples is separated from the first plurality of samples by a time period. A phase shift is determined for the duration of the time period and the phase shift is applied to the second plurality of samples. The first plurality of samples is combined with the second plurality of samples to obtain combined samples, and the Doppler frequency for the target is obtained from the combined samples.

Abstract: A radar system for discriminating between sources of radar interference and targets of interest. The system includes a transmitter for transmitting radar signals into a region, a receiver for receiving return signals of the radar signals returned from within the region, and a processor for processing the return signals to discriminate between return signals returned from a first object and return signals returned from a second object where the return signals from the second object comprise both zero and non-zero Doppler components and interfere with the return signals from the first object. The radar system is operable for discriminating between the return signals when the return signals are received at a distance from the second object which is less than a proximity limit based on the geometry of the object.

Abstract: This disclosure aims to accurately track a tracking target regardless of a surrounding environment. A tracking processor may be provided, which includes a tracking processing module configured to perform processing of tracking a tracking target, and a congestion degree calculating submodule configured to calculate a degree of congestion of objects located within an area including an estimated position of the tracking target. The tracking processing module may perform the processing of tracking the tracking target based on a value of the congestion degree calculated by the congestion degree calculating submodule.

Abstract: Operating a police radar detector to suppress nuisance radar alerts due to received signals that are not police radar signals includes receiving electromagnetic signals; mixing received electromagnetic signals with a local oscillator signal that is swept at a constant sweep rate; and accumulating a virtual image of the signal environment represented by received electromagnetic signals. Analysis of the virtual image is performed for signals suspected of being nuisance signals that could result in nuisance radar alert so that any nuisance signals within the virtual image can be identified and ignored by the alarm portion of the police radar detector.

Abstract: The distinguishing of rain echoes from ground echoes is performed by an analysis of the attenuation of the radar echoes, a radar echo being classed as a rain echo if its attenuation on a logarithm scale as a function of distance fluctuates around an affine straight line according to a given statistical law.

Abstract: A ground radio station (GRS) apparatus and a radio station apparatus included in an unmanned aerial vehicle (UAV) are provided. The GRS apparatus may include an antenna configured to transmit and receive a radio frequency (RF) signal, an RF and/or intermediate frequency (IF) (RF/IF) chain configured to perform a conversion between the RF signal and a baseband signal, a baseband transceiving processor configured to transmit and receive the baseband signal, and a BB-IF interface configured to map the baseband signal to the RF/IF chain or the baseband transceiving processor.

Abstract: An altimeter apparatus for external fuselage mounting for an aircraft includes an altimeter circuit and a chassis. The altimeter circuit is coupled to an antenna system. The altimeter circuit is configured to generate a first signal and transmit the first signal via the antenna system, receive a second signal via the antenna system, wherein the second signal is a reflected version of the first signal, and determine an altitude based on the first and second signals. The chassis is configured to contain the altimeter circuit and the antenna system, wherein the chassis is connected to a fuselage of the aircraft and is located outside of the aircraft.

Abstract: Methods and systems for detection of an occupancy status of a space monitored by a system (100) are described herein. The method comprises detecting a magnetic field value at the space by a magnetic field sensor (210) of a sensing device (104). The detected magnetic field value with a reference magnetic field value, to determine a magnetic occupancy status (MOS) of the space. The MOS is indicative of the change in the occupancy status of the space. The change in the occupancy status is indicative of one of a change from empty to occupied occupancy status, and a change from occupied to empty occupancy status. Further, when the MOS indicates the change in the occupancy status of the space, a radar sensor (212) of the sensing device (104) is activated to determine a radar occupancy status (ROS) by generating at least one radar reading from the radar sensor (212). The ROS is indicative of the change in the occupancy status of the space.

Abstract: A method and apparatus are provided to authenticate information embedded within radar signals. Radar signals comprising embedded information are received from a first sender. First position information is determined corresponding to a position of the first sender. Second position information associated with the embedded information is determined. The first and second position information is compared.