双载频线性调频连续波雷达测距研究

Research of range finding of dual-carrier frequency LFMCW radar

一般线性调频连续波雷达在对运动目标测距时,采用增加调频斜率的方法来消除运动目标多普勒频移的影响,但这种方法会增加系统处理时间,实时性较差.为缩短数据处理的时间,增加系统探测目标的实时性,研究了一种新的调频测距方法.通过分析,使用双载频线性调频连续波可以实现对运动目标的快速探测,大大缩短了数据处理时间,并且提高了雷达系统对目标的发现概率和综合抗干扰能力.新方法提高了测距雷达的整体性能,在对高速运动目标的精确探测与打击等领域有着很好的应用前景.

As the common LFMCW radar is used for ranging, the scheme of increasing the slope of FM canbe employed to eliminate the impacts of Doppler frequency shift of moving targets, which, however, may lengthenthe system’s processing time, resulting in the poor real-time. This paper aims to study a new scheme of FMranging, which can shorten the time of data processing and enhance the real-time of system detecting the targets.The analysis shows that the fast detection of moving targets can be implemented by using the dual-carrierfrequency LFMCW, the data processing time shortened greatly, and the probability of target detection and thecapability comprehensive anti-jamming for the radar system enhanced as well. The new scheme improves theoverall performances of ranging radars, and has an excellent application prospect in the fields of the accuratedetection and hit of high speed moving targets.