CAJ | 학술논문

水下多目标的远程检测和方位估计是是水下阵列信号处理的两个关键问题。传统的方法是将这两个方面分开处理，先通过某种检测方法来检测目标个数，然后再利用某种方位估计方法来确定各个目标的方位。这样前面目标检测的结果的好坏就直接影响到后面目标方位估计的性能。针对低信噪比下传统检测方法的性能差且不能同时给出方位估计的问题，提出了一种基于水下运动阵列合成孔径技术的多目标检测和方位估计一体化新方法SATDE。该方法充分利用水下运动阵列合成孔径技术来提高阵增益和角度分辨率，并利用体现信号能量的MVDR空间谱函数来确定目标的个数及方位。仿真结果表明，对于相干信号来说，提出的方法在低信噪比下的检测性能显著优于AIC和MDL等传统方法，并且可以同时给出正确的方位估计。
수하다목표적원정검측화방위고계시시수하진렬신호처리적량개관건문제。전통적방법시장저량개방면분개처리，선통과모충검측방법래검측목표개수，연후재이용모충방위고계방법래학정각개목표적방위。저양전면목표검측적결과적호배취직접영향도후면목표방위고계적성능。침대저신조비하전통검측방법적성능차차불능동시급출방위고계적문제，제출료일충기우수하운동진렬합성공경기술적다목표검측화방위고계일체화신방법SATDE。해방법충분이용수하운동진렬합성공경기술래제고진증익화각도분변솔，병이용체현신호능량적MVDR공간보함수래학정목표적개수급방위。방진결과표명，대우상간신호래설，제출적방법재저신조비하적검측성능현저우우AIC화MDL등전통방법，병차가이동시급출정학적방위고계。
In the field of array signal processing, the detection of the number of signals and estimation of the Direction of Arrival(DOA)of signals are two important issues. They are generally solved separately with some algorithms dedicated to detection and other algorithms dedicated to DOA estimation. An integrated method called Synthetic Aperture Technique based Detection and Estimation(SATDE)is proposed for multi-target detection and DOA estimation by underwater moving array. The proposed method exploits the synthetic aperture technique to achieve high angular resolution and the energy detection idea embodied in Minimum Variance Distortionless Response(MVDR)spectrum function to determinate the number and DOA of signals at the same time. Simulations and experimental results show that the proposed method yields better detection performance than conventional detection methods such Akaike Information Criterion(AIC)and Minimum Descriptive Length(MDL)for closely-spaced coherent signals and produces correct DOA estimations at the same time.