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Study on STAP Method in Non-homogeneous Clutter Environment

Author: DanRong
Tutor: HuangXiaoTao
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: Space Time Adaptive Processing (STAP) non-homogeneous clutter environments clutter suppression Power Selected Training (PST) method Non-Homogeneous Detector (NHD) prior knowledge Range-Doppler domain ATI (RD-ATI)
CLC: TN957.51
Type: Master's thesis
Year: 2009
Downloads: 31
Quote: 1
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Abstract


Space time adaptive processing (STAP) is a leading technology candidate for improving detection performance of next generation airborne radar. The performance of STAP is greatly affected in non-homogeneous clutter environments. New STAP algorithms for this problem are studied widely.Three common non-homogeneous factors are researched firstly in this paper, they are: power non-homogeneity、interference target and discrete interference. Then, the influence to STAP caused by nonhomogeneous clutter environment is analyzed and simulated.For power non-homogeneity, the typical method called power selected training (PST) is researched. It is shown that when there are not enough strong secondary data for selected, the PST method can’t work well, so the improvement of the PST method is proposed, and the result of simulation and real data shows its effectiveness. For interference target, Non-homogeneous Detector (NHD) is introduced. For discrete interference, substitution method is used and improved. Besides, the range-Doppler domain ATI (RD-ATI) technique is used to detect interference moving target and provide important information to STAP.Based on the research of methods for non-homogeneous clutter environments, at the end of the paper, integrative STAP approach is researched. The direct-data domain (DDD) method is introduced. To research the knowledge-based STAP, a non-homogeneous STAP method based on priori SAR image is proposed and simulated. Furthermore, a Non-homogeneous STAP Approach Combined with RD-ATI Technique is proposed, in which RD-ATI technique is used as a NHD to provide prior knowledge of moving targets, PST method is employed to restrain clutter power non-homogeneous, and Frequency Domain Substitution (FDS) method used to eliminate the discrete interference. The approach improves conventional STAP performance significantly and greatly reduces computational burden, which has a great practical value. The result of real data from a three-channel SAR/GMTI system shows efficiency of the approach.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Radar signal detection and processing
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