Parallel streamlined processing method for LFMCW array radar signals

A processing method, array radar technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problems of large computing time, multiple hardware resources, large amount of computing, etc., and achieve time complexity reduction , high computing efficiency, and the effect of reducing system cost

Active Publication Date: 2019-10-01
LINGBAYI ELECTRONICS GRP
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Problems solved by technology

[0006] The present invention is aimed at the processing of LFMCW array radar signals in the distance dimension, angle dimension and Doppler dimension, and the amount of calculation is very large, which will consume more hardware resources. At the same time, it also consumes a lot of computing time and does not meet the application scenario problems with high real-time requirements. It provides a parallel pipeline processing method for LFMCW array radar signals that can improve computing efficiency, save hardware resources, and reduce system costs.

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  • Parallel streamlined processing method for LFMCW array radar signals
  • Parallel streamlined processing method for LFMCW array radar signals
  • Parallel streamlined processing method for LFMCW array radar signals

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Embodiment

[0026] Step 1, before the follow-up processing, the M distance units are used as the Doppler channel number N to perform a fast Fourier transform (FFT) of 2M points, discard the negative frequency components, and construct the echo signal and its fast time dimension and angle dimension (spatial ), Doppler dimension (slow time dimension) processing model.

[0027] Array element receiving signal

[0028]

[0029] In the formula, q is the number of samples in the fast time dimension of each cycle, P is the number of transmitted pulses, l is the array element number, A is the echo amplitude, e is the exponent, j is the imaginary number unit, and fr is the difference frequency in the distance dimension , d is the distance between the vibration elements, θ is the target angle, λ is the wavelength, fd is the Doppler frequency, T p is the chirp modulation cycle, Q is the number of samples in the fast time dimension of each cycle, and L is the number of array element channels.

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Abstract

The invention discloses a parallel streamlined processing method for LFMCW array radar signals, and aims to provide a processing method which can improve the operation efficiency, save hardware resources and lower the system cost. The technical scheme is implemented as follows: a digital receiving unit adopts a time-sharing sampling chip A / D which integrates an embedded programmable low-noise amplifier (LNA) and a programmable anti-aliasing filter for receiving radar array signals; digital processing is carried out by adopting a digital interpolation synchronization algorithm, and then a fieldprogrammable gate array (FPGA) is adopted to carry out fine topology on a space-time frequency three-dimensional complex signal processing algorithm, so that the calculation amount is reduced; a space-time frequency three-dimensional joint processing target detection mathematical model is constructed; finally, the processing module algorithms are subjected to decomposition fusion, and a completeparallel streamlined structure of the fine topology is constructed; and the signal processing algorithms are mapped to the FPGA, and parallelization, streamlined and pipeline treatment are carried outon the linear frequency modulation continuous waves ( LFMCW).

Description

technical field [0001] The invention relates to a parallel streamlined processing method mainly for short-distance LFMCW radar, anti-collision LFMCW radar, long-distance LFMCW sky wave and ground wave radar array signals. Background technique [0002] With the development of LFMCW radar technology, chirp signal has been widely used in the field of high-resolution radar. Linear frequency modulation continuous wave radar transmits electromagnetic waves whose frequency changes with time, and then detects the radial distance, speed and other information of the target by the phase difference and frequency difference between the target echo and the transmitted signal. The radar system that uses frequency modulation to obtain distance and speed information has attracted extensive attention in recent years because of its advantages such as small range blind zone, high range resolution, low transmission power, and simple structure. Its operating distance is usually relatively small....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/34
CPCG01S13/34
Inventor 刘华林狄中泉李海彬谢兰军游志平向琛雷东季伟
Owner LINGBAYI ELECTRONICS GRP
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