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Simple radar multi-target parameter extraction method

A parameter extraction, multi-target technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as failure, computational complexity defects, and detection algorithms that are easy to fall into local extreme value detection technology.

Active Publication Date: 2015-06-03
XIAN UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Matrix inversion It is not only a defect in computational complexity, but more importantly, when the target orientation parameter (i from 1 to D), when the difference is small The condition number is so small that The calculation error is very large, which makes the detection algorithm easy to fall into local extremum and makes the entire detection technology invalid

Method used

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Experimental program
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Effect test

Embodiment 1

[0081] One-dimensional iterative implementation of the classical maximum likelihood detection technique - an implementation method of the alternating projection detection technique.

[0082] The structure of the array radar system is completely known, so its array popular vector form is completely known, that is, the vector a(θ i ) = a i The form of is completely known. For the snapshot data output by the radar, we can calculate its covariance matrix R.

[0083] In the initial estimation stage of this technology, if more than 3 targets are involved, the method designed by this technology needs to be used. Equation (3) gives the algebraic expression of the projection operator in the case of two targets. When the parameters of the two targets are known This formula is used when estimating the third objective parameter. For more target situations, use the (expansion) inversion formula to iteratively find it. Its specific implementation steps are:

[0084] Estimate the initia...

Embodiment 2

[0108] Implementation method of alternate separation detection technique.

[0109] The initial detection stage of the target parameters only needs to repeatedly use the formula Any number of initial estimates of the target parameters can be obtained.

[0110] In the main iterative loop, Eq. (4) gives the assumption that targets 2 and 3 are known, and the initial estimate of target 1 has been obtained, but the operator that needs to be used to further obtain its relatively accurate estimate. Because the target label is completely artificial. Therefore, the precise estimation of the azimuth parameters of targets 1, 2 and 3 can be obtained by using formula (4) repeatedly. The problem-solving strategies for more target situations are completely similar, just write out the corresponding formula (4).

[0111] Estimate the initial value of signal azimuth (take 3 targets as an example)

[0112] Step 1: Initial parameter estimation, for i from 1 to 3,

[0113] ①Calculation: Q 1 =I...

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Abstract

The invention discloses a simple radar multi-target parameter extraction method. In the method, D is equal to three targets, when the number of targets is greater than 3, equations similar to equations (3) and (4) can be written in an imitating manner, but only the expression is relatively lengthy. The simple radar multi-target parameter extraction method specifically comprises the following steps: 1), estimating initial parameters of a signal direction, wherein when i ranges from 1 to D, D represents the sequence number of signals and is supposed to be equal to 3, if i is equal to 1, a formula shown in the description and another formula shown in the description are calculated so as to obtain an estimated target direction parameter initial value shown in the description, and i ranges from 1 to 3; 2), performing main iterative circulation, estimating a parameter shown in the description according to the initial parameters obtained in the step 1), thereby obtaining precise estimation on i, wherein i ranges from 1 to 3; 3), for the precise estimation on the value as shown in the description obtained in the step 2), calculating another two formulas shown in the description so as to obtain estimation on three target waveform parameters according to formula (4) and (8) shown in the specification, thereby providing parameter basis on target positioning and waveform identification, wherein i ranges from 1 to 3; when the number of the targets is greater than or equal to 3, writing a corresponding matrix shown in the description, Qi and expression of a projection matrix operator Pak,i according to existing expression such as P <A2-3> and matrix inversion iterative calculation relationship shown in the description. Therefore, the calculation complexity degree is substantially reduced, and the inversion errors can be avoided.

Description

technical field [0001] The invention belongs to the technical field of radar multi-target parameter detection and estimation, in particular to a simple radar multi-target parameter extraction method. Background technique [0002] Radar multi-target parameter detection and estimation technology is widely used in military and civilian fields, especially in the current military technology background where multiple warheads simultaneously launch and multi-jamming coexist and large-scale multi-input multi-output civilian technology systems, this technology is particularly important. [0003] Radar multi-target parameter detection and estimation technology is to obtain the azimuth, waveform and other parameters of multiple different targets to distinguish them, and then provide a basis for identifying them. Existing radar multi-target parameter detection and estimation techniques are roughly divided into data fitting and subspace fitting. The former involves matrix inversion and t...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 邵朝翟永智李国彬李强林路路
Owner XIAN UNIV OF POSTS & TELECOMM
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