Time domain dimensionality reduction based multi-snapshot iterative array element amplitude phase error estimation method
An array element amplitude and phase error, time domain technology, which is applied in the field of multi-snapshot iterative array element amplitude and phase error estimation for time domain dimension reduction, can solve the problems of high performance requirements of auxiliary sources and increased system complexity, etc.
Active Publication Date: 2019-10-25
XIDIAN UNIV
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Active correction is a method of off-line correction of the error of the element by using an external accurately known auxiliary source. This method can achieve better results in theory, but it has higher performance requirements for the auxiliary source and increases the complexity of the system.
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[0073] The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto.
[0074] A multi-snapshot iterative array element amplitude and phase error estimation method with dimensionality reduction in the time domain, such as figure 1 As shown, the method steps are as follows:
[0075] Step 1: Take out the echo data x of L distance units received by the radar after pulse compression l , where l=1,2,...,L, and construct the clutter representation basis matrix ψ of these L distance units l ,(l=1,2,...,L);
[0076] Step 2: Using the time-domain dimensionality reduction method, the echo data x l and clutter represent the basis matrix ψ l Carry out time-domain dimensionality reduction processing to obtain echo data z after dimensionality reduction K,l and clutter represent the basis matrix ψ K,l , where l=1,2,...,L;
[0077] Step 3: Initialize the norm p of the received ...
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The invention belongs to the technical field of radars, and particularly relates to a time domain dimensionality reduction based multi-snapshot iterative array element amplitude phase error estimationmethod. The method comprises the following steps: 1, constructing a basis matrix according to echo data xl; 2, obtaining echo data zK, l after dimensionality reduction and a clutter representation basis matrix psi K, l by using a time domain dimensionality reduction method; 3, according to the echo data zK, l after the dimensionality reduction, obtaining a norm of the echo data after the dimensionality reduction; 4, calculating the complex amplitude of clutter data of each distance unit of ith iteration; and 5, calculating optimal estimation es, opt of an array element amplitude phase error.The array element amplitude phase error estimation method has the advantages that the time domain dimensionality reduction is adopted, the estimation precision is relatively high, and automatic convergence can be achieved.
Description
technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a multi-snapshot iterative array element amplitude and phase error estimation method for dimensionality reduction in the time domain. Background technique [0002] With the rapid development of information science and technology, national defense has entered the information age. As the key equipment to win the modern information war, the airborne early warning radar is regarded by the militaries of various countries as a sharp weapon for information acquisition that can influence the battlefield situation due to its unique strategic characteristics. The clutter suppression performance is the main factor affecting whether the airborne early warning radar can work normally. The space-time adaptive processing STAP technology first proposed by Brennan and Reed can effectively suppress space-time coupled ground clutter, and is a prototype of the STAP method. [0003] Many ...
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IPC IPC(8): G01S7/40
CPCG01S7/40G01S7/4004
Inventor 王彤马欣刘程王萌
Owner XIDIAN UNIV