Extremely high frequency echo processing method and system based on time-frequency domain matrix joint matching
A processing method and technology in the time-frequency domain, applied in the radar field, can solve the problems of unachievable pulse compression, high frequency, and inability to match, achieve high parameter estimation accuracy and practicability, reduce the probability of false alarms, and ensure the effect of target detection
Pending Publication Date: 2022-06-07
XIAN UNIV OF POSTS & TELECOMM
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However, for EHF radar, no matter whether it adopts the phase code pulse compression method or the chirp pulse compression method, there will be a serious mismatch due to the extremely high frequency and extremely short wavelength, or even no matching at all, so that it cannot be realized Pulse compression, it is impossible to detect the target at all, let alone estimate the distance and speed of the target
[0004] Because the frequency band is extremely high and the wavelength is extremely short, a very small moving speed of the target will produce a large Doppler frequency. The existing method for estimating the parameters of the moving target in the extremely high frequency band cannot match the target well. The target cannot be detected very well, or even cannot be detected at all, and the target parameter estimation accuracy is not high
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[0061] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 The embodiments of the present invention, and all other embodiments obtained by those of ordinary skill in the art without creative work, fall within the protection scope of the present invention.
[0062] It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" ” refer to directions towards or away from the geometric center of a particular part, respectively.
[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one...
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The invention discloses an extremely-high-frequency echo processing method and system based on time-frequency domain matrix joint matching, and the method comprises the steps: firstly, periodically transmitting an extremely-high-frequency linear frequency modulation pulse signal, and enabling the repetition period to be T; target echoes are received, and a multi-frequency-domain parallel channel is constructed to receive an echo data matrix; constructing a three-dimensional time-frequency domain joint matching matrix according to the target Doppler range and the emission signal bandwidth; obtaining a three-dimensional matrix based on target echo joint matching filtering of the echo data moment and the three-dimensional time-frequency domain joint matching matrix; performing target plane constant false alarm rate detection and primary target aggregation on the three-dimensional matrix according to pages until primary target aggregation is performed on all pages of the data matrix; and carrying out secondary target condensation processing on all targets based on a time-frequency coupling corresponding relation, and estimating target parameters. It is ensured that an extremely-high-frequency radar target can be effectively checked, the false alarm probability is reduced, and the target parameter estimation precision is improved.
Description
technical field [0001] The invention belongs to the field of radar, and relates to an extremely high frequency echo processing method and system for joint matching of time-frequency domain matrices. Background technique [0002] Conventional radars generally work at tens of megahertz to tens of gigahertz. With the development of chip and radar technology and the increase of target detection range and accuracy, the working frequency of radar has also expanded to the extremely high frequency band of hundreds of terahertz. Due to the extremely high target frequencies and extremely short wavelengths, conventional radar signal processing methods cannot be used. Therefore, the estimation of parameters such as distance and speed of radar targets in very high frequency bands is an important problem for radar to be solved urgently. [0003] Conventional radar detection and tracking need to detect the three-dimensional coordinates and motion parameters of distant targets. Therefore, ...
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Login to View More IPC IPC(8): G01S7/41
CPCG01S7/411Y02A90/10
Inventor 王胜华曹运合
Owner XIAN UNIV OF POSTS & TELECOMM