FMCW radar high-precision distance estimation method based on variable step size interpolation iteration
A technology of distance estimation and variable step size, which is applied in the field of FMCW radar distance estimation based on variable step size interpolation iteration, can solve the problems of low accuracy of distance estimation, poor anti-interference ability, and low accuracy of algorithmic frequency estimation, etc. The effects of the influence between the lines, the improvement of accuracy, and the strong ability to resist environmental interference
Active Publication Date: 2020-06-26
CHONGQING UNIV OF POSTS & TELECOMM
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However, in FMCW radar, due to the use of single-step amplitude spectrum information, the above algorithm has poor anti-interference ability
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[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0033] The overall technical scheme of the present invention includes: firstly, according to the characteristics of the FMCW radar, windowing the obtained intermediate frequency signal; secondly, performing fast Fourier transform on the windowed signal and obtaining the index value of the maximum amplitude spectrum line ; Then iterative interpolation is performed according to the deviation correction factor of the maximum amplitude spectr...
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The invention relates to the technical field of high-precision distance estimation of an FMCW radar, in particular to an FMCW radar distance estimation method based on variable step size interpolationiteration. The method comprises the following steps: firstly, windowing an obtained intermediate frequency signal according to the characteristics of the FMCW radar; performing fast Fourier transformon the windowed signal and solving an index value of a maximum peak spectral line; constructing a deviation correction factor according to the maximum amplitude spectral line and the adjacent spectral lines on the left and right sides of the maximum amplitude spectral line to perform iterative interpolation, and updating the interval between the auxiliary spectral line and the maximum amplitude spectral line in each iteration to gradually correct the deviation value; and solving a distance estimation value from the target to the radar according to the relationship between the frequency and the distance. According to the method, the problems of fence effect and spectrum leakage in a traditional distance estimation algorithm can be effectively improved, the distance estimation precision isgreatly improved, and the method has high environmental interference resistance.
Description
Technical field [0001] The invention relates to the technical field of high-precision distance estimation of FMCW radars, in particular to a method of FMCW radar distance estimation based on variable step length interpolation iteration. Background technique [0002] Radar can work around the clock, and is not affected by factors such as light and weather, so it is widely used in the military field. By radiating electromagnetic waves into space and detecting the echoes reflected by the target, information such as the distance of the target is obtained. Because the frequency modulated continuous wave (FMCW) radar has the advantages of easy implementation in hardware, simple structure, small size, light weight and low cost. In terms of performance, it has the advantages of high range resolution, low transmitting power, no range blind zone, short-distance measurement, etc. Its application has gradually moved from military radar to civilian use. [0003] With the wide application of ...
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IPC IPC(8): G01S13/34G01S7/40
CPCG01S13/341G01S7/4056Y02A90/10
Inventor 田增山李艳春王勇周牧
Owner CHONGQING UNIV OF POSTS & TELECOMM