Produce lfm,tfm,sfm,pfm,bpsk,qpsk cw ledai signal .Use short-time Fourier transform arrive at the instantaneous frequency.-Produce lfm, tfm, sfm, pfm, bpsk, qpsk cw ledai signal. Use short-time Fourier transform arrive at the instantaneous frequency.

matlab绘制CW信号的时域波形，同时对信号进行频谱分析，并考察采样频率以及信噪比对频谱分析的影响。-matlab draw CW signal time-domain waveform, and spectral analysis of signals and the sampling frequency and signal to noise ratio study of the impact of spectrum analysis.

彩超CW的IQ数分析，做fft变换，看频谱的能量(Color Doppler ultrasound CW IQ number analysis, do FFT transform, look at the spectrum of energy)