SAR成像仿真，设定场景参数，目标参数和信号参数后对应两种不同分辨率完成正交解调接收方式仿真SAR回波信号，观察信号的时、频域波形。-SAR imaging simulation, set the scene parameters, target parameters and signal parameters corresponding to the two different resolutions to complete the quadrature demodulator receive

QPSK调制后产生QPSK信号，QPSK信号分别通过AWGN信道、Rayleigh衰减信道和Rician衰减信道，分别通过QPSK解调出数字信号，通过输入与输出数字信号的对比计算出仿真过程中的传输误比率，并将其与各衰减信道的理论误比率进行对比-Generate QPSK signal QPSK modulation, QPSK signals through AWGN channel, Rayleigh fading channel and Rician fading channel, resp