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1.雷达接收器的要求 多普勒测距成象雷达需要一个外差接收器,该外差接收器通过使雷达返回信号与一个类似主振荡器的稳定的本机振荡器相混合;产生图象频率(IF)输出。混频器是一个10μm光电探测器,其电学带宽要求取决于雷达返回信号的多普勒频移,即目标的相对速度。通常,本机振荡器的频率偏离主振荡器频率某一固定量。对于
1. RADAR RECEIVER REQUIREMENTS Doppler range imaging radars require a heterodyne receiver that is fabricated by mixing the radar return signal with a stable, local oscillator like the main oscillator; Like frequency (IF) output. The mixer is a 10μm photodetector whose electrical bandwidth requirements depend on the Doppler shift of the radar return signal, the relative speed of the target. Normally, the local oscillator frequency deviates from the main oscillator frequency by a fixed amount. for