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CFAR detection method based on two-dimensional frequency spectrum coherent combination

A detection method and two-dimensional spectrum technology are applied in the field of CFAR detection based on two-dimensional spectrum coherent combining, which can solve the problems of high time complexity of the two-dimensional CFAR algorithm and unfavorable hardware implementation, so as to facilitate hardware structure implementation and reduce time. Complexity, the effect of simplifying the CFAR detection process

Active Publication Date: 2020-07-03
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to propose a CFAR detection method based on two-dimensional spectrum coherent combination, to solve the problem of high time complexity of the two-dimensional CFAR algorithm in the radar signal processing system. Facilitate hardware implementation issues

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  • CFAR detection method based on two-dimensional frequency spectrum coherent combination
  • CFAR detection method based on two-dimensional frequency spectrum coherent combination
  • CFAR detection method based on two-dimensional frequency spectrum coherent combination

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Embodiment Construction

[0024] Such as Figure 1~3 As shown, a CFAR detection method based on two-dimensional spectrum coherent combination, the specific steps are:

[0025] Step 1: Set the size of the radar transceiver antenna array and the number of MIMO cycles;

[0026] In some embodiments, the scale of the radar transceiver antenna array is 3 transmissions and 4 receptions, including 3 transmission antennas and 4 reception antennas, which will form 12 virtual channels, and the transceiver antenna array is set to complete 42 MIMO cycles;

[0027] Step 2: Denote the echo signal obtained by the k-th MIMO period, the m-th transmit antenna, and the n-th receive antenna as s(m,n,k), where 0≤m<3, 0≤n<4 ,0≤k<42;

[0028] Down-convert the echo signal s(m,n,k) into an intermediate frequency signal, and obtain discrete data Data through intermediate frequency filtering, amplification, and ADC sampling adc ;

[0029] Step 3: For discrete data Data adc Perform FFT transformation of 256 points to obtain t...

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Abstract

The invention discloses a CFAR detection method based on two-dimensional frequency spectrum coherent combination. Coherent combination is carried out on a two-dimensional frequency spectrum after 2D-FFT processing in a millimeter wave radar signal processing system, CFAR detection on each virtual channel frequency spectrum is avoided, and the problem of high CFAR detection time complexity in the radar signal processing process is solved; 2D-FFT data of each virtual channel of an MIMO antenna array is subjected to weighted summation and amplitude squaring, multiple pre-combination directions are covered through multiple groups of weights of a specified adder, and peak search and classic two-dimensional OS-CFAR detection are combined so as to reduce the influence of channel difference on a target detection result, the detection probability in a CFAR search engine is improved, and hardware implementation is simplified.

Description

technical field [0001] The invention belongs to the field of target detection of a millimeter-wave radar signal processing system, and specifically relates to a CFAR detection method based on two-dimensional frequency spectrum coherent combination. Background technique [0002] With the increasing development of intelligent driving technology, the vehicle-mounted millimeter-wave radar system has attracted the attention of many scholars and has very important research value. Millimeter-wave radar can present the outline of the target, provide real path planning and passable space detection functions, and provide more accurate environmental information for intelligent driving environment perception. With all-weather and all-day working characteristics, small size and low price, it makes up for the shortcomings of cameras, lidar and other sensors. Considering the implementation complexity, hardware cost, and size limitation, the vehicle-mounted millimeter-wave radars all use M...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 彭树生李小柳吴礼卞亨通
Owner NANJING UNIV OF SCI & TECH