A Noise Estimation Method for Automotive Millimeter Wave Radar System Based on Entropy Statistics
A millimeter-wave radar and system noise technology, applied in radio wave measurement systems, instruments, etc., can solve the problem of low noise estimation accuracy of the vehicle-mounted millimeter-wave radar system, and achieve the effect of improving detection ability, precision and accuracy
Active Publication Date: 2020-12-29
NANJING CHUHANG TECH CO LTD
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[0005] The purpose of the present invention is to provide a method for estimating the noise of the vehicle-mounted millimeter-wave radar system based on entropy statistics, so as to solve the problem that the noise estimation accuracy of the vehicle-mounted millimeter-wave radar system is not high
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Embodiment 1
[0031] Embodiment 1: This embodiment provides a 77GHz vehicle-mounted millimeter-wave radar system noise estimation method based on entropy statistics as shown in the figure, including data extraction and system noise estimation. The specific steps are as follows:
[0032] Step 1: Collect data in the radar anechoic chamber;
[0033] Step 2: Preliminarily process the collected data, according to the fast Fourier transform formula:
[0034] The two-dimensional Fourier spectrum of the radar signal is obtained by performing fast Fourier transform on the distance dimension and the velocity dimension of the original data respectively;
[0035] Step 3: intercepting the data of the two-dimensional Fourier spectrum to obtain the intercepted two-dimensional Fourier spectrum data, the method of intercepting the two-dimensional Fourier spectrum data is: intercepting the two-dimensional Fourier spectrum The half of the two-dimensional Fourier spectrum corresponding to the long distance ...
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The invention discloses a vehicle-mounted millimeter wave radar system noise estimation method based on entropy statistics. The method comprises steps of extracting data, estimating system noise, andcollecting the data in a radar darkroom; preliminarily processing the acquired data, and respectively performing fast Fourier transform on the distance dimension and the speed dimension of the original data to obtain a radar signal two-dimensional Fourier spectrum; intercepting and selecting the data of the two-dimensional Fourier spectrum to obtain intercepted and selected two-dimensional Fourierspectrum data, and obtaining data for noise calculation from the two-dimensional Fourier spectrum data through entropy statistics; calculating a fuzzy entropy value of the distance dimension data corresponding to each speed dimension in the intercepted two-dimensional Fourier spectrum data, selecting the data through a set entropy value threshold value, and judging that the intercepted two-dimensional Fourier spectrum data is unavailable if the finally obtained data size conforming to the entropy value threshold value is less than one third of the intercepted two-dimensional Fourier spectrumdata. According to the method disclosed by the invention, precision of estimating the system noise is improved.
Description
technical field [0001] The invention belongs to the technical field of noise estimation of a vehicle-mounted millimeter-wave radar system, and in particular relates to a method for estimating noise of a vehicle-mounted millimeter-wave radar system based on entropy statistics. Background technique [0002] For vehicle-mounted millimeter-wave radars, the ability to detect targets is an important indicator for evaluating its performance. Due to the limitations of hardware conditions, the radar receiving system will generate some noise in the process of receiving signals, and the radar does not have the ability to distinguish the information from these noises in the process of receiving information, resulting in the noise mixed in the useful information is also received System acquisition affects the ability of subsequent radar signal processing to detect targets. Therefore, the analysis and evaluation of system noise is of great significance to millimeter wave radar. [0003]...
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IPC IPC(8): G01S7/41
CPCG01S7/414G01S7/418
Inventor 李从志张洁吴军王奇卫一真宋玛君黄小月石明礼
Owner NANJING CHUHANG TECH CO LTD