A time-delay-Doppler frequency shift extraction method based on external radiation source radar
An external radiation source radar and Doppler frequency shift technology, which is applied in the field of signal processing, can solve the problems of large errors and achieve the effect of improving time delay and reducing time complexity
Active Publication Date: 2019-02-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0018] The present invention aims at the problem that the existing time-frequency two-dimensional correlation method extracts the time delay-Doppler frequency parameters in the process of radar detection, which often have relatively large errors, and proposes a more accurate time delay-Doppler frequency parameter extraction method
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[0042] In this embodiment, the Barker code chirp signal is used as the reference signal, and the time domain diagram of the signal is shown in the attached image 3 As shown, the simulation parameters of the signal are shown in Table 1. The operating system of the simulation platform is WIN7 (64bit) CPU 3.20GHz, which is compiled with MATLAB R2012a (64bit). The basic parameters of the simulation are shown in Table 1 below:
[0043] Table 1 Simulation basic parameter list
[0044] pulse width
[0045] The target delay of this simulation is 2.11(us), and the Doppler frequency shift is 5455Hz
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The present invention belongs to the signal processing field and relates to a passive coherent location radar-based delay-Doppler frequency extraction method. The passive coherent location radar-based delay-Doppler frequency extraction method of the invention is based on a traditional time-frequency two-dimensional correlation method; in the extraction process of the delay and Doppler frequency of a target, initial delay and Doppler frequency are obtained through mainly using reference signals and the traditional method; and compensation and correlation operation are performed on the reference signals and target signals, so that more accurate delay and Doppler frequency can be obtained. Compared with the traditional method, the method of the invention can obviously improve the detection precision of delay and Doppler frequency in radar detection and is lower in time complexity when reaching the same detection precision.
Description
technical field [0001] The invention belongs to the field of signal processing, in particular to a time delay-Doppler frequency extraction method based on external radiation source radar. Background technique [0002] External radiation source radar uses non-cooperative third-party radiation signals such as ground radio stations, television stations, and communication stations to obtain target information after being scattered by the target. It has the characteristics of strong survivability, good anti-interference performance, and the potential to detect stealth targets. , and has the ability to detect low-altitude targets. In the process of external radiation source radar detection, time delay and Doppler frequency are the most important extraction parameters. The accuracy of this parameter directly affects the subsequent positioning of the target. At present, the main method for parameter extraction of time delay and Doppler frequency is time-frequency two-dimensional c...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 李万春田正武唐遒彭丽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA