A method for improving the accuracy of measuring a distance to an object using a wireless communication signal and an electronic device therefor the same are provided. The method includes transmitting a wireless communication signal to an external object by controlling a wireless communication module, receiving a signal returned based on the transmitted wireless communication signal being reflected from the external object by controlling the wireless communication module, acquiring a first distance to the external object based on a transmission time point of the transmitted signal and a reception time point of the received signal, acquiring a second distance to the external object based on phases of the transmitted signal and the received signal by controlling the phase matching module, and estimating a distance to the external object based on the first distance and the second distance.

Example embodiments described herein involve techniques for removing transmit phase noise. A system may cause a printed circuit board (PCB) to supply a signal enabling the transmission line to couple the signal to the radar unit and the delay line to couple the signal to the quadrature coupler. The radar unit may use the signal to transmit a radar signal on a radio channel having a centered radio frequency while the quadrature coupler uses the signal to produce an output from the quadrature coupler. The system may estimate phase noise relative to the radio channel having the centered RF based on the output from the quadrature coupler, receive, from the radar unit, a radar reflection corresponding to the radar signal, and determine information representative of one or more objects in an environment based on the radar reflection and the phase noise.

Methods, systems and non-transitory computer readable mediums for processing radar signals to recover signals inside a blind region are disclosed. A transmission signal is transmitted from a radar system. The radar system receives a return signal. The return signal includes a first portion of the transmission signal leaked during transmission and a second portion reflected from an object within the blind region. The return signal is partially decoded by zeroing out the first portion of the transmission signal to form a modified return signal. Pulse compression is performed over the modified return signal to form a compressed return signal. The compressed return signal is processed to calculate moment products. The moment products are calibrated with a calibration factor, wherein the calibration factor is multiplied against only calculated moment products of range gates which have been partially decoded.

Systems and methods for software defined radar are disclosed. Exemplary systems utilize a frequency stacking bandwidth reconstruction technique for a stepped frequency signal to create a synthetic wideband waveform. The methods enable low-cost, reconfigurable applications such as ground penetrating radar or small unmanned aerial vehicle synthetic aperture radar platforms.

The invention relates to a method for simplifying a sampled signal digital filter, the method including at least one step for: in order to obtain a first intermediate filter, gathering channels including discrete nonstationary operations relating to the same signal, the first channels including the nonstationary operations relating to a first signal and the second channels including the nonstationary operations relating to a second signal, in order to obtain a second intermediate filter, on each of the first channels and second channels, commutative stationary operations with the nonstationary operations, in order to eliminate the redundant nonstationary operations, and building the filter corresponding to the last obtained intermediate filter.

A radar system for generating a fast frequency hopping output for frequency agility using a transmitter block and a receiver block. The transmitter block is configured to (i) modulate a digital signal using a first digital mixer, (ii) convert a modulated signal into an inphase analog signal and provide the inphase analog signal to at least one of a first RF IQ mixer or a third RF IQ mixer, (iii) convert the modulated signal into a quadrature analog signal provide the quadrature analog signal to at least one of the first RF IQ mixer or the third RF IQ mixer, and (iv) generate the fast frequency hopping output radar signal by mixing the inphase analog signal and the quadrature analog signal with an inphase RF local oscillator signal and a quadrature RF local oscillator signal.

A phased-array Doppler radar includes a two-way splitter, a transmit antenna, a receive antenna array, an ILO, a demodulation unit and a digital signal processing unit. A reference signal is split by the two-way splitter to the transmit antenna for transmission to targets and the ILO for injection locking. Signals reflected by the targets are received by the receive antenna array as received signals. An injection-locked signal generated by the ILO and the received signals received by the receive antenna array are delivered to the demodulation unit. The received signals are demodulated into baseband I/Q signals by the demodulation unit that uses the injection-locked signal as a local oscillator signal. The baseband I/Q signals are processed by the digital signal processing unit to obtain a digital beamforming pattern.

Techniques and apparatuses are described that implement a smart-device-based radar system capable of performing symmetric Doppler interference mitigation. The radar system employs symmetric Doppler interference mitigation to filter interference artifacts caused by the vibration of the radar system or the vibration other objects. This filtering operation incorporates the interference artifact within the noise floor, without significantly attenuating reflections from a desired object. This mitigation can filter each radar frame independently without a priori knowledge about the frequency or amplitude of the vibration. The filtering operation is also independent of the Doppler sampling frequency and can handle aliasing. By filtering the interference artifacts, the radar system produces fewer false detections in the presence of vibrations and can detect objects that would otherwise be masked by the interference artifact.

A low phase noise radar system is disclosed. The system has a signal generator having a stable oscillator that outputs a first lower-frequency signal, a direct digital synthesis circuit that outputs an analog waveform, and a mixer to receive the first lower-frequency signal, and the analog waveform, the mixer to mix the first lower-frequency signal and the analog waveform to generate a signal generator output signal. The system further includes an up converter coupled with the signal generator to filter and to increase frequencies of the signal generator output signal to generate a filtered and frequency multiplied signal to be transmitted.

A method for measuring, using a radar or sonar, the velocity with respect to the ground of a carrier moving parallel to the ground, includes the following steps: a) orienting the line of sight of the radar or sonar toward the ground; b) emitting a plurality of radar or sonar signals (P.sub.1-P.sub.N) that are directed toward the ground, and acquiring respective echo signals (E.sub.1-E.sub.N); c) processing the acquired echo signals so as to obtain, for one or more echo delay values, a corresponding Doppler spectrum; d) for the or at least one the echo delay value, determining a high cut-off frequency of the corresponding Doppler spectrum; and e) computing the velocity of the carrier with respect to the ground on the basis of the one or more high cut-off frequencies. A system allowing such a method to be implemented.