A Smoothing and Filtering Method of Dot Trace Sequence Aiming at Multi-frame Joint Detection

A technology of multi-frame joint detection and dot trace sequence, which is applied in the direction of measuring device, radio wave measurement system, radio wave reflection/reradiation, etc., can solve the problem of low estimation accuracy, improve estimation accuracy and suppress noise correlation , to achieve the effect of long-term tracking

Active Publication Date: 2018-06-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, in order to ensure detection performance and real-time radar display requirements, multi-frame joint detection technology usually adopts the form of sliding window batch processing, and the result of a single sliding window processing is only some track fragments rather than continuous and complete target track
In order to obtain complete target track information, traditional methods often directly use the last frame estimation result obtained by each sliding window process as an update to the target state at the current moment. This method does not perform subsequent smoothing and filtering processing. Accuracy tends to be lower

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  • A Smoothing and Filtering Method of Dot Trace Sequence Aiming at Multi-frame Joint Detection
  • A Smoothing and Filtering Method of Dot Trace Sequence Aiming at Multi-frame Joint Detection

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[0029] specific implementation plan

[0030] The present invention mainly adopts the method of computer simulation for verification, and all steps and conclusions are verified correctly on MATLAB-R2012b. The specific implementation steps are as follows:

[0031] Step 1. Initialize system parameters:

[0032] The initialization system parameters include: the total number of observation frames K=30; the current moment k=6; the interval between frames T=1s; the number of frames for one multi-frame joint detection processing N=6; the dimension of the target state n=4; the augmented target state transfer matrix

[0033] in I m Represents the identity matrix of m×m;

[0034] Augmented Process Noise Covariance Matrix

[0035] where diag(·) represents a diagonal matrix, Indicates the Kronecker product operation;

[0036] Dot trace sequence observation matrix

[0037] autoregressive model coefficient matrix where the parameter λ 1 =λ 2 =...=λ 5 =0.95; autoregressi...

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Abstract

Aiming at the multi-frame joint detection technology of the sliding window batch processing structure, the invention proposes a dot track sequence smoothing filter method for the multi-frame joint detection, which solves the problems of low tracking accuracy and difficulty in forming a complete target track in the traditional method. The method of the present invention fully utilizes the structural characteristics of multi-frame joint detection by adopting the target state in an augmented form, and can provide the filtering result of the target state at the current moment and the results of other target states in the current sliding window in real time at any processing moment. The result is smoothed, thereby effectively improving the target state estimation accuracy and realizing long-term tracking of the target. In addition, through the noise whitening preprocessing step, the present invention effectively suppresses the influence of noise correlation of dot trace sequences obtained by adjacent sliding window processing, thereby further improving the estimation accuracy.

Description

technical field [0001] The invention belongs to the technical field of radar data processing, in particular to radar weak target tracking technology. Background technique [0002] As we all know, the diverse small and weak targets and the increasingly complex detection environment have led to a serious decline in the detection performance of active radars, with problems such as large missed detections and discontinuous tracking. Therefore, how to reliably detect and track weak targets in complex environments is an urgent technical problem for modern radar systems, which has important theoretical value and practical significance. [0003] Different from the traditional single-frame detection technology, the multi-frame joint detection technology can realize the effective accumulation of the target signal and the detection of noise / clutter by jointly processing the echo data of multiple frames and utilizing the difference in the inter-frame correlation between the target and n...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S13/66
CPCG01S7/41G01S13/66
Inventor 易伟方梓成孙旭锋陈方园王经鹤孔令讲崔国龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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