双谱估计法及其在智能地雷时延估计中的应用

智能地雷中影响目标定位精度的关键性技术之一是时延估计。常用的时延估计方法是广义互相关方法,按方法对于较少先验知识、大背景噪声具有一定的局限性。结合坦克声目标的探测,提出了一种可以应有的不必具有先验知识、对背景噪声不敏感的新方法——双谱估计法,进行了理论介绍和公式推导,利用野外实测数据和编制的程序,检验方法的适用性,和广义互相关法比较,取得了较好的效果,表明在选验知识较少和背景噪声较强时它的适用性更好。双谱估计法对于智能地雷的时延估计技术进一步优化具有重要作用。

Time Delay Estimate Using Bispectrum Method and Application in TimeDelay Estimate of Intelligent Mine

Time delay estimate is the key technology affecting precision of target orientation in the intelligent mine. The common using method is generalized cross correlation, but it has a definite limitation to those without transcendental information on the occasion of having much noise. This paper puts forward a new method-time delay estimation using bispectrum method, according to the practice of intelligent detecting target of tanks, introduces the theory and deduces the expressions. Its applicability is verified with field measure and compiled program; Better effect is obtained when comparing it with the method of generalized cross correlation.