基于旋转干涉仪模糊相位差的多假设NLS定位算法

摘要

To cope with the disadvantage that many receiving channels will be needed in traditional Long Baseline Interferometer (LBI) localization system, a novel emitter localization method using ambiguous phase difference measurements by a rotating LBI is proposed. High localization precision can be achieved in a short observing period with no localization ambiguity, and the amount of receiving channels can be reduced to two. To cope with the strong nonlinear problem caused by the phase difference ambiguity, a multiple hypothesis nonlinear least square localization algorithm is proposed. Flow of the algorithm is presented. The algorithm has some advantages, such as small computation burden and strong ability on resolving localization ambiguity. Moreover, localization precision of the algorithm can approach Cramer-Rao lower bound. Feasibility of the localization method and performance of the localization algorithm are validated through computer simulations.%针对传统长基线干涉仪(LBI)定位系统通常需要多个接收通道的缺点,该文提出了一种基于旋转LBI模糊相位差的定位新体制,最少只需两个接收通道即可实现快速、高精度、无模糊定位.针对相位差模糊导致的强非线性问题,提出了一种多假设非线性最小二乘定位算法,给出了算法的实现流程,从理论上分析了子区域宽度的选择依据.该算法计算量小、解定位模糊的能力强,定位精度能够达到克拉美罗下限(CRLB).计算机仿真实验验证了该文定位体制的可行性以及算法性能的优越性.