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针对以往单站无源定位系统中采用的多通道干涉仪或阵列测向系统复杂、易受通道间幅相不一致性影响等缺点,提出了一种基于信号子空间分解的运动单站单个长基线干涉仪(LBI)直接定位(DPD)方法。该方法采用量子粒子群优化(QPSO)方法获得定位初值,再利用Newton迭代方法得到精估计值。仿真结果表明:增加观测器的机动性,可对辐射源实现快速无模糊的定位;定位性能在较高信噪比(SNR)下可接近定位误差的克拉美-罗下限(CRLB),在低信噪比下优于多通道干涉仪仅测角(BO)和长基线相位差变化率定位方法。
Aiming at the shortcomings of multi-channel interferometer or array direction finding system used in single-station passive location system, which is easily influenced by the inconsistency of amplitude and phase between channels, a single long baseline of moving single station based on signal subspace decomposition Interferometer (LBI) Direct Positioning (DPD) method. In this method, QPSO method is used to obtain the initial location value, and the Newton iteration method is used to obtain the refined estimation value. Simulation results show that the proposed method can increase the observer mobility and achieve fast and unambiguous positioning of the radiation source. The positioning performance can reach the Cramer-Luo Lower Limit (CRLB) of the positioning error at high signal-to-noise ratio (SNR) Signal to noise ratio is better than multi-channel interferometer only angle measurement (BO) and long baseline phase difference rate of change of positioning method.