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本发明涉及一种信号处理系统,该系统在发射多个载频的同时,接收载频中的一部分,而抑制另一些载频。在采用本发明的雷达系统中,连续波载频和脉冲调制的载频同时由一个天线发射出去。连续波载频和受调制载波产生的回波频率由一个接收机保护电路接收,此电路可让脉冲调制载频的低功率回波通过,到达接收机处理电路,但是功率电平超过预定门限的连续波载频却被此电路抑制。接收机保护器确保在频率捷变系统里使用多个载频,并且这些频率之间的间隔很小。
The present invention relates to a signal processing system that receives a portion of a carrier frequency while suppressing other carrier frequencies while transmitting a plurality of carrier frequencies. In the radar system employing the present invention, a continuous carrier frequency and a pulse-modulated carrier frequency are simultaneously transmitted by one antenna. The continuous carrier frequency and the echo frequency generated by the modulated carrier are received by a receiver protection circuit that allows the low power echo of the pulsed carrier frequency to pass through to the receiver processing circuitry but at a power level above a predetermined threshold Continuous wave carrier frequency is suppressed by this circuit. The receiver protector ensures that multiple carrier frequencies are used in a frequency-agile system and the separation between these frequencies is small.