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针对脉冲辐射源定位问题,提出了一种基于短时时差(TDOA)序列的多站无源定位新方法。首先建立了TDOA序列模型,然后推导了该方法定位误差的克拉美罗下限(CRLB),并提出了一种高效的解算方法——两步定位法(TSLM):第1步利用TDOA序列线性估计出TDOA及其变化率信息,第2步基于TDOA及其变化率信息进行定位。典型场景下的分析表明:在短时间内,两步定位法获得的辐射源位置估计略微有偏,但大体上定位误差可较好地逼近CRLB;此外,脉冲重复周期越小,短时TDOA序列对应的定位精度越高;观测站速度越大,相应的定位精度越高。
Aiming at the location problem of pulsed radiation source, a new multi-station passive location method based on short time difference (TDOA) sequence is proposed. Firstly, the TDOA sequence model is established, and then the Cramerlob Lower bound (CRLB) of the positioning error is derived. An efficient solution method - two-step localization method (TSLM) is proposed. The first step is to use TDOA sequence linearity Estimate the TDOA and its rate of change information, and the second step is to locate it based on the TDOA and its rate of change information. The analysis of the typical scenarios shows that the position estimation of the radiation source obtained by the two-step localization method is slightly biased in a short time, but the positioning errors generally approximate the CRLB. In addition, the shorter the pulse repetition period, the short TDOA sequence The corresponding positioning accuracy is higher; the greater the observation station speed, the higher the corresponding positioning accuracy.