CAJ | 학술논문

针对调频连续波(FM-CW)零中频雷达收发前端噪声较大,接收机灵敏度较低的缺点,在分析了零中频雷达接收机中存在的转换噪声和低频噪声原因的基础上,提出了一种提高零中频雷达接收灵敏度的二次变频新方法。该方法通过二次变频增大接收机信号与噪声之间的频距,使接收机系统能够更有效地过滤噪声分量。实践表明,这种二次变频技术可提高系统信噪比10 dB,显著提高了接收机系统灵敏度。
침대조빈련속파(FM-CW)령중빈뢰체수발전단조성교대,접수궤령민도교저적결점,재분석료령중빈뢰체접수궤중존재적전환조성화저빈조성원인적기출상,제출료일충제고령중빈뢰체접수령민도적이차변빈신방법。해방법통과이차변빈증대접수궤신호여조성지간적빈거,사접수궤계통능구경유효지과려조성분량。실천표명,저충이차변빈기술가제고계통신조비10 dB,현저제고료접수궤계통령민도。
Homodyne radar transceiver front-end noise is relatively large,resulting in the sensitivity of the ra-dar receiver system is very low.The maximum noise components are FM-AM conversion noise and low frequen-cy noise of the receiver.This paper presented a quadratic mixing techniques for zero-IF radar.This method en-larged the frequency distance between receiver signal and noise signal,which made the receiver noise filtering more effective.Finally,simulation results showed that the signal to noise ratio was raised by 10 dB.