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中文摘要：
针对Ka波段自差频式连续波（CW）多普勒雷达系统中发射漏波信号对接收灵敏度的影响问题,通过计算机建模仿真和实验测试,对存在发射功率泄漏干扰情况下一个接收系统前端（包括低噪声放大器和混频器）的工作性能进行了深入研究.结果表明,在收发隔离度为26dB时,系统所允许的最大发射漏波信号功率电平为-11dBm,接收系统前端增益恶化小于2.5dB.根据这些参数,通过合理设计发射功率电平和收发隔离度,可以保证接收系统的探测灵敏度指标的实现.
英文摘要：
Due to limited transmitting-receiving isolation, the receiving sensitivity of Ka-band autodyne continue wave （CW） Doppler radar system is usually affected by a relatively high power leaking signal from the transmitter. In order to guarantee the sensitivity, the performance of the frontend receiving circuit （including low noise amplifier and mixer） influenced by the leaking signal has been investigated through simulation and experimental measurement. According to the simulation and experimental results, the maximum allowable power level of the transmission leakage signal is - 11 dBm in a Doppler radar system with 26 dB transmitting-receiving isolation. In this case, the decrease of the gain provided by the front-end receiving circuit is less than 2. 5 dB. With reference to these parameters, the transmission power and transmitting-receiving isolation can be specified reasonably to eliminate the negative effects caused by the leakage signal on the receiving sensitivity.
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