CAJ | 학술논문

给出了一种分段无源预选滤波器的设计,以提高接收机对带外强干扰的抑制能力及信噪比、灵敏度等指标.该预选滤波器采用无源LC并联谐振实现滤波,微控制器控制衰减倍数来调节滤波器的输出幅度.将预选滤波器加入到扫频雷达中对电离层进行探测,实验结果表明：该滤波器提高了接收机的信噪比、灵敏度,对带外强干扰的抑制能力可达20 dB,改善了雷达的性能.
급출료일충분단무원예선려파기적설계,이제고접수궤대대외강간우적억제능력급신조비、령민도등지표.해예선려파기채용무원LC병련해진실현려파,미공제기공제쇠감배수래조절려파기적수출폭도.장예선려파기가입도소빈뢰체중대전리층진행탐측,실험결과표명：해려파기제고료접수궤적신조비、령민도,대대외강간우적억제능력가체20 dB,개선료뢰체적성능.
The receiver＇s parameters such as the rejection capability of interference outside the band,the signal to noise ratio,and the sensitivity can be improved by using the merogenesis passive preselected filter in the front end of the receiver.The preselected filter is realized by parallel resonance passive LC circuits and its output magnitude is controlled by the microcontroller adjusting the attenuator coefficient.The experimental results show that the preselected filter improved the receiver＇s parameters of the signal to noise ratio and the sensitivity,had the ability to suppress strong interference of outside the band reached 20dB and promoted the performance of the radar.