For get mod instantaneous frequency from underwater acoustic signal, the paper estimate instantaneous frequency and get perfect estimate result by colligating the difference method and the M -estimate method. By emulation mode with computer, present instantaneous frequency estimate and contrast it with the truth value.%为了获得水声信号稳健的瞬时频率值,本文综合相位差分法和M-估计方法对瞬时频率进行估计,获得理想的估计值.通过计算机仿真分析,给出采用该方法获得的瞬时频率估计值,并与真值进行对比.
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