By means of Hilbert transform, the author obtains the signalenvelope, and then calculates the demodulation spectrum.
首先利用希尔波特变换解调出信号包络，进而计算出解调谱；
2
The method based on joint parameter estimation shows preferable performance almost at all times, in cases of various number of targets and various type of signalenvelope.
基于参数联合估计的多目标定位方法在不同目标数目、不同信号包络的定位实验中都有较好的表现。
3
The speed and accuracy are increased by improving the search strategy, adjusting the threshold of the video signalenvelope and setting the corresponding transitive state.