论文部分内容阅读
在天线和环行器之间的雷达传输线中加入脉动的90°移相器,可以增加微波多普勒雷达测量缓慢移动的近目标速度的能力。由于相位移动,多普勒频率是作为载波的调制信号而不是作为基带信号探测的。在解调之前,载波可以放大和滤波,结果产生出极强而干净的测量和显示用的解调多普勒信号。
Adding a pulsating 90 ° phase shifter to the radar transmission line between the antenna and the circulator increases the ability of the microwave Doppler radar to measure slowly moving near-target speeds. Due to the phase shift, the Doppler frequency is detected as a modulated signal of the carrier rather than as a baseband signal. Before demodulation, the carrier can be amplified and filtered, resulting in a very strong and clean demodulated Doppler signal for measurement and display.