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A Robust Design Method for Slow Time Series under Independent Disturbance Environment

A robust design and slow time technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as high algorithm complexity, deteriorating solutions, and underutilization of prior information, achieving low computational complexity and good optimization results , the effect of improving the efficiency of the algorithm

Active Publication Date: 2020-03-27
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, this method assumes that the target Doppler is completely unknown, which does not make full use of prior information; in addition, the solution algorithm based on SDR+randomization theory has high algorithm complexity, and the rank-one relaxation in it will deteriorate the quality of the solution. Limit the SNR that can be optimized

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  • A Robust Design Method for Slow Time Series under Independent Disturbance Environment
  • A Robust Design Method for Slow Time Series under Independent Disturbance Environment
  • A Robust Design Method for Slow Time Series under Independent Disturbance Environment

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Embodiment Construction

[0039] combined with figure 1 , the specific implementation steps of the present invention are described as follows:

[0040] 1 Build a system model

[0041] 1.1 Signal Model Description

[0042] Considering the point target detection scenario in an independent interference environment, it is assumed that the monostatic radar transmits N pulses within a correlation processing interval (CPI), and the matched filtering is completed for each pulse at the receiving end within its corresponding pulse repetition period (PRT) And perform peak sampling, then the observation vector at the receiving end is

[0043] v=αs⊙p+n

[0044] where s=[s 1 ,s 2 ,...,s N ] T is the slow-time emission sequence, s iis its i-th codeword, α is the magnitude complex parameter of the Rayleigh fluctuation target, and has is the frequency steering vector, f T is its corresponding target normalized Doppler frequency; n is the covariance of R n =E[nn H ] independent interference; E[·] means expe...

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Abstract

The invention discloses a robust design method for slow time series in an independent interference environment, which belongs to the field of radar signal processing. For undulating point targets with unknown speeds, the invention normalizes the Doppler f T modeled as f 0 Nearby uniformly distributed random variables, and their second-order statistical properties are described. Finally based on f T The covariance matrix M of constructs a robust design optimization problem to maximize f T The SNR in the distribution interval can improve the target detection probability in this interval, and it has better Doppler robustness compared with the optimal design in which the target Doppler is accurately known. Compared with the robust design method in the unknown Doppler interval [0,1], the optimization range of the present invention is more targeted, so it can achieve a better optimization effect. In addition, the algorithm used in the present invention has the advantages of semi-positive definite relaxation algorithms. Lower computational complexity improves algorithm efficiency.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a robust design method of a radar slow-time constant modulus sequence, which is applicable to a moving target detection scene of a monostatic radar in an independent interference environment. Background technique [0002] In the cognitive radar system, using the prior knowledge of the target to design a slow time domain sequence that matches the moving target but does not match the environment can effectively suppress the interference components in the environment and greatly improve the radar's ability to detect moving targets , so the optimal slow time series design based on prior knowledge has been extensively studied. Aiming at the problem of moving target detection in an independent jamming environment, the priori target Doppler information and the second-order statistical characteristics of jamming are usually used to design a radar slow-time transmission ...

Claims

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Application Information

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IPC IPC(8): G01S7/36
Inventor 崔国龙付月王祥丽陈璐杨婧易伟张天贤孔令讲杨晓波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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