CAJ | 학술논문

为了提高三元阵被动定位精度，该文对互谱法时延差估计进行了研究改进。改进算法解决了单独采用互谱法进行时延差估计存在的相位模糊问题，增强了互谱法在实际应用的鲁棒性。该算法所得时延差由周期值和修正值构成；时延差周期值是通过对阵元间互谱信号进行时延补偿所得，时延差修正值是采用最小二乘法对补偿后互谱信号拟合所得。理论分析和实验结果表明：采样率为310 Hz时的时延差估计精度可以达到610? s ，该方法具有很强的实用性。能有效提高三元阵被动定位精度。
위료제고삼원진피동정위정도，해문대호보법시연차고계진행료연구개진。개진산법해결료단독채용호보법진행시연차고계존재적상위모호문제，증강료호보법재실제응용적로봉성。해산법소득시연차유주기치화수정치구성；시연차주기치시통과대진원간호보신호진행시연보상소득，시연차수정치시채용최소이승법대보상후호보신호의합소득。이론분석화실험결과표명：채양솔위310 Hz시적시연차고계정도가이체도610? s ，해방법구유흔강적실용성。능유효제고삼원진피동정위정도。
In order to improve the passive positioning accuracy of three-element array, a modified cross-spectral algorithm is proposed for time delay difference estimation. The improved method solves phase ambiguity issue in conventional the cross-spectral method, and enhances the robustness of cross-spectral method in practical application. The time delay difference obtained with the proposed method contains cycle value and correction value. The cycle value is obtained by compensating the phase of cross-spectrum signal, and the correction value is obtained by applying least-squares to cross-spectrum signal after compensation. Theoretical analysis and experiment results show that this method can achieves the evaluation accuracy of 610? s for sampling rate of 310 Hz , and has a strong practicability. Therefore it can effectively improve the positioning accuracy of three-element array passive positioning.