MIMO radar waveform modulation and demodulation method

Abstract

The present invention discloses an MIMO (Multiple-Input Multiple-Output) radar waveform modulation and demodulation method. The method comprises the following steps of: according different transmitting channels at a transmitting end, modulating periodic target detection baseband signals to form different phase codes at the Doppler dimension; converting echo signals received by each receiving signals of a receiving end to digital echo signals after the echo signals are preprocessed, and performing windowed Fourier transform of the digital echo signals according to distance dimensions; converting the digital echo signals after windowed Fourier transform to a matrix in a distance-Doppler two-dimensional form, and performing decoding of the matrix in the Doppler dimension; and performing Doppler dimension coherent processing of the decoded signals to separate each transmitting channel to obtain two-dimensional output of the distance-Doppler frequency. The waveform modulation and demodulation method generates different frequency offsets at the Doppler dimension through phase encoding so as to achieve the purpose of distinguishing different transmitting channels and solve the mutual interference problem between the channels due to increasing of the transmit-receive antennas; and moreover, the signal real-time bandwidth and the computing resource consumption are not increased.

Description

technical field [0001] The invention belongs to the technical field of MIMO radar, and relates to the phase encoding technology of the MIMO radar transmission waveform and the corresponding signal processing technology at the receiving end. Background technique [0002] As one of the core sensors that provide environmental perception information, vehicle radar is widely used in the fields of automotive intelligent braking and driverless driving. In practical applications, considering factors such as the size of the radar sensor, the number of receiving antennas is relatively small, so high and reliable angular resolution cannot be achieved. The Multiple-Input Multiple-Output (MIMO) radar can achieve relatively high angular resolution through virtual arrays with fewer receiving antennas, so the current mainstream vehicle radar generally adopts a centralized MIMO system. One of the core problems of MIMO radar is that each receiving antenna can distinguish different transmitte...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a MIMO radar waveform modulation and demodulation method, which generates different frequency offsets in the Doppler dimension through phase encoding, so as to achieve the purpose of distinguishing different transmission channels and solve the problem of inter-channel interaction caused by the increase in the number of transceiver antennas. interference problem

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