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Distributed coherent radar moving target echo coherent synthesis method

A technology of coherent radar and synthesis method, applied in radio wave measurement systems, instruments, etc., can solve problems affecting coherent performance, Doppler mismatch, etc., and achieve the goal of solving Doppler mismatch and reducing the impact of noise Effect

Active Publication Date: 2020-03-24
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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Problems solved by technology

Unlike the case of a stationary target, since the moving target will bring the Doppler frequency, there will be a Doppler mismatch problem during matched filtering, and this will affect the estimation of the coherent parameters, thereby affecting the coherent performance

Method used

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  • Distributed coherent radar moving target echo coherent synthesis method
  • Distributed coherent radar moving target echo coherent synthesis method
  • Distributed coherent radar moving target echo coherent synthesis method

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Embodiment Construction

[0019] In this embodiment, the target is a distributed coherent radar system, and its general structure is as follows figure 1 shown. The implementation process and information processing flow are as follows: figure 2 As shown, the specific description is the following process:

[0020] S1 echo signal distance correction: After down-converting the received signal at the receiving unit l, it can be expressed as:

[0021]

[0022] Among them, t represents the fast time variable, n represents the slow time variable, and s k (t) represents the transmitting signal waveform of transmitting unit k, ξ represents the complex scattering coefficient, τ lk (n)=τ lk (0)-n(v t +v r ) T r / c means path delay, and Indicates the phase of the main array introduced during up- and down-conversion, f d Indicates the Doppler frequency, w l (t,n) represents additional Gaussian white noise. The echoes of different periods are in different distance units, and the distance units need ...

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Abstract

The invention relates to a distributed coherent radar moving target echo transmit-receive full-phase participation synthesis method. The method comprises the following steps of for the influence of Doppler frequency on matched filtering and coherent parameter estimation under the condition of a moving target, creating a three-dimensional data matrix then carrying out Doppler filtering and matchedfiltering processing and extracting peak value estimation coherent parameters and Doppler frequency; and adjusting the transmitted signal according to the estimated time delay difference and phase difference, and constructing a matched filter according to the Doppler frequency. The method comprises the following specific steps: 1) echo signal distance correction; 2) Doppler filtering; 3) matched filtering; 4) peak value method parameter estimation, (5) judgment as to whether the parameter estimation precision meets requirements or not, (6) refining of Doppler frequency, (7) parameter adjustment of a transmitting end, and (8) conducting matched filtering and coherent fusion at a receiving end. The method can eliminate moving target echo signal mismatch influences caused by the Doppler frequency and achieve echo receiving and transmitting all-phase participation synthesis under the moving target condition.

Description

technical field [0001] The invention belongs to the technical field of distributed coherent radar. Background technique [0002] In order to meet the needs of modern operations, Lincoln Laboratory proposed the concept of distributed coherent radar in 2003: to replace the large-aperture radar with a multi-part dispersed array or unit aperture radar to achieve equivalent detection performance. Its core and key is to achieve simultaneous in-phase superposition of multiple transmission signals at the target. Distributed coherent radar mainly has two working modes: receiving coherent mode and transmitting and receiving coherent mode. According to the acquired target position information, all unit radars are aimed at the direction of the target area in the receiving coherent mode, and transmit mutually orthogonal signal waveforms, which are separated by matched filtering at the receiving end to estimate the time delay difference between the signals and phase difference. Then sw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 涂刚毅王雪琦吴少鹏
Owner THE 724TH RES INST OF CHINA SHIPBUILDING IND
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