Sub-band self-adaptive GLRT-LTD detection method under sea clutter background

A detection method and sea clutter technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as performance degradation of adaptive detection methods, and achieve the effect of improving detection performance and accurate detection and judgment

Active Publication Date: 2015-04-29
XIDIAN UNIV
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Problems solved by technology

However, the actual situation is: the sea clutter is short-term stationary but long-term non-stationary, uniform in the local distance interval and non-uniform in the large distance interval
When the above two basic conditions are not satisfied, the performance of the adaptive detection method will be severely degraded

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  • Sub-band self-adaptive GLRT-LTD detection method under sea clutter background

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[0024] The present invention will be further described below in conjunction with accompanying drawing:

[0025] In order to be able to detect weak moving targets such as small boats on the sea surface, the cumulative time of the adaptive detector is as long as tens of milliseconds, or even a few tenths of a second, and the corresponding cumulative pulse number is increased to tens or even hundreds (here it is assumed that the radar works at Low repetition rate mode, pulse repetition frequency within 1000Hz). Within the sub-second accumulation time, the radial velocity of the target can be considered as constant, and the target echo obeys the simple form of complex amplitude multiplied by Doppler steering vector. The contradiction between the large number of accumulated pulses and the short uniform range of the sea clutter is the main difficulty in the detection of weak moving targets in the background of sea clutter. In order to solve this problem and improve the detection ab...

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Abstract

The invention belongs to the field of radar target detection, and particularly relates to a sub-band self-adaptive GLRT-LTD detection method under a sea clutter background. The sub-band self-adaptive GLRT-LTD detection method under the sea clutter background comprises the steps that a DFT modulation filter set is utilized to carry out sub-band decomposition on a sea return time sequence received by a radar, a sub-band decomposition signal of each sub-band filter in the DFT modulation filter set is obtained, and the sub-band decomposition signal of the Kth sub-band filter is expressed as Xk; K1 down-sampling is carried out on the sub-band decomposition signal Xk of the Kth sub-band filter to obtain a corresponding K1 down-sampling post signal; a scale parameter lambda k and a shape parameter eta k of a sea clutter Pareto amplitude distribution model corresponding to the Kth sub-band filter are determined; a sub-band self-adaptive GLRT-LTD detection statistical magnitude tk,k1 of a kth sub-band subjected to the K1 down-sampling is obtained, a constant false-alarm threshold is set, the detection statistical magnitude of each sub-band is compared with the constant false-alarm threshold of the sub-band, and whether a target exists or not is judged.

Description

technical field [0001] The invention belongs to the field of radar target detection, and in particular relates to a subband self-adaptive GLRT-LTD (generalized likelihood ratio-linear threshold detector) detection method under the background of sea clutter. Background technique [0002] Faint target detection in the background of sea clutter has always been one of the main tasks of marine surveillance radars. For the statistical characteristics of space-varying and time-varying sea clutter, it is considered to be an effective way to adopt an adaptive moving target detection method that matches the characteristics of sea clutter. Adaptive detectors that match the characteristics of sea clutter generally include two parts: adaptive sea clutter suppression and matched filter reception of target echoes. Most of the existing adaptive detectors are based on the following two basic assumptions: the sea clutter is stationary within the coherent accumulation time; the sea clutter is...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/292
CPCG01S7/292G01S7/41
Inventor 水鹏朗孟庆霞刘明
Owner XIDIAN UNIV
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