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无源时差定位中,当目标处于运动状态时,多普勒频率的存在将导致时延差估计精度变差。自相关法和互相关法相结合的多普勒频差估计方法可以获得可靠性较高、估计精度较好的频差估计结果。对该结果进行频差补偿后,采用基于相位谱的时延估计方法获得两信号间的时延差。经过仿真验证,这种基于频差补偿的时延估计方法可以有效降低多普勒频差对时延差估计精度的影响。
In passive time-difference positioning, when the target is in motion, the existence of Doppler frequency will lead to poor accuracy of estimation of the delay delay. The Doppler frequency difference estimation method combining autocorrelation and cross-correlation can obtain the result of frequency difference estimation with high reliability and good estimation accuracy. After compensating for the frequency offset of the result, the time delay difference between the two signals is obtained by using the time-delay estimation method based on the phase spectrum. After simulation, the time delay estimation method based on frequency offset compensation can effectively reduce the impact of Doppler frequency error on the estimation accuracy of time delay difference.