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基于脉冲对处理技术,本文提出了一种估计目标多卜勒频率及其变化率的脉冲对处理新方法。推导出了CRAMER-RAO限的表达式以及脉冲对方法估计多卜勒频率变化率的误差力差分析表达式。在短数据长度,信噪比大于工作门限时,这种新方法可获得接近CRAMER—RAO限的估计精度,并且只有很小的计算量。此外,基于近来提出的“修正的FFT方法”,本文还提出了一种运算量可减少数十倍的“改进的FFT方法”,并给出了这个改进方法的最小可用信噪比(溢出概率)的分析与计算公式。
Based on the pulse pair processing technique, a new method of pulse pair processing is proposed in this paper to estimate the target Doppler frequency and its rate of change. The expression of CRAMER-RAO limit and the analytic expression of error force difference of pulse Doppler method to estimate the rate of change of Doppler frequency are deduced. At short data lengths, with a signal to noise ratio greater than the operating threshold, this new approach achieves an estimation accuracy close to the CRAMER-RAO limit with only a small amount of computation. In addition, based on the recently proposed “Modified FFT Method”, this paper also proposes a “modified FFT method” that can reduce the computational complexity by a factor of ten and gives the minimum available signal-to-noise ratio ) Analysis and calculation formula.