Clutter environment based transmitting and receiving jointly optimized adaptive filtering method

An adaptive filtering and joint optimization technology, applied in the radar field, can solve problems such as large amount of computation, divergence of the filtering process, and increased error in estimation of the amplitude of the scattering center, achieving the effect of high estimation accuracy and small amount of computation

Active Publication Date: 2013-05-22
XIDIAN UNIV
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Problems solved by technology

However, there is also the problem of a large amount of calculation, and it is easily affected by the setting parameters, which can easily cause the filtering process to diverge, resulting in an increase in the amplitude estimation error of the scattering center.

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  • Clutter environment based transmitting and receiving jointly optimized adaptive filtering method
  • Clutter environment based transmitting and receiving jointly optimized adaptive filtering method
  • Clutter environment based transmitting and receiving jointly optimized adaptive filtering method

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Embodiment Construction

[0030] refer to figure 1 , the realization steps of the invention are as follows:

[0031] Step 1, transmit a phase-encoded signal.

[0032] refer to figure 2 , the radar transmission signal mode of the present invention is set to be composed of a plurality of intervals i, i=1, 2,..., each interval i contains M identical phase encoding signals, and the encoding methods include P3 code, P4 code, Frank code and Golomb code, this example adopts P3 code, expressed as:

[0033] s=[s(1),s(2),...,s(N)] T ,

[0034] in,[·] T For the transpose operation, the nth element in the vector is j represents an imaginary number, is the phase of s(n), n=1,2,...,N, where N is the code length.

[0035] Step 2, calculate the received echo.

[0036] Usually, during the radar observation time, the amplitude of the scattering center of the same range unit fluctuates, so in the radar observation environment, the same range unit scattering center corresponds to different pulses, and thei...

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Abstract

The invention discloses a clutter environment based transmitting and receiving jointly optimized adaptive filtering method which mainly solves the problems that operation quantity is large while a receiver and a transmitter are not in jointly optimized utilization in the prior art. The method includes the implementation procedures: 1) transmitting a group of phase-coded signals; 2) calculating received echoes; 3) performing matched filtering for the received echoes; 4) feeding back a scattering center amplitude estimated value obtained by matched filtering to a transmitter, and setting a transmitted signal side lobe weight; 5) optimizing the phase-coded signals to enable weighted integral side lobe level to be the smallest; 6) transmitting the optimized phase-coded signals and calculating received echoes; and 7) performing adaptive filtering for the received echoes to obtain an amplitude estimated value of a scattering center. The method is optimal to an existing filtering method in amplitude estimation performance of the scattering center, is small in operation quantity, preliminarily achieves closed loop feedback of cognitive radar from a receiver to the transmitter, and can be used for radar clutter suppression and target detection.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an adaptive filtering method for joint optimization of transmission and reception, which can be used for radar to estimate the amplitude of the scattering center of the range unit of interest in a clutter environment, and to realize closed-loop feedback from a receiver to a transmitter , improve the estimation accuracy and reduce the computation load. Background technique [0002] With the rapid development of modern electronic technology, the working environment faced by radar is becoming more and more complex. Modern radar not only has to face the traditional "four resistance" problems, that is, anti-electronic interference, anti-radiation missile, anti-stealth, and anti-low-altitude penetration. It is necessary to integrate multiple working modes and have the comprehensive ability to handle multi-objective and multi-task. Cognitive radar, as an intelligent radar tha...

Claims

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Application Information

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IPC IPC(8): G01S7/28
Inventor 刘峥吴旭姿刘韵佛
Owner XIDIAN UNIV
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