Design And Implementation Of X - Band LFMCW Radar Based On Sampling Phase Lock

LFMCW radar has the inherent advantages of measuring velocity and distance in high precision. Many scholars have already lucubrated the implementation of this technique at home and abroad and many application scenarios have been developed. This paper makes a design of an X-waveband LFMCW radar and realizes its RF front-end. To detect a small target(person) within 600m, this paper designs a SPLL as LO of the Radar system, which decreases the effect of LO’s phase noise on detection. Finally, the system makes a successful detection of target, and the detection performance is much more than expected.Firstly, this paper determines the overall structure diagram of the radar system. Secondly, each function device is designed and implemented. Thirdly, all modules are constructed and tested. Considering that the radar is applied to detect people within 600 meters in open ground and people have a small RCS, so the system should have a high receiving sensitivity. Therefore, the LO of zero IF receiver ought to have low phase noise.Comparing to digital PLL, the outstanding phase noise performance of SPLL makes it possible to become an ideal device to generate single frequency source. Based on this, this paper successfully develops an SPLL, and makes it as LO of the radar system. Its stability, reliability and phase noise performance all meet engineering requirement.In the end, the system which is based on SPLL is tested in out-field. The result shows that this system can successfully detect targets within the preset-distance. In other words, this system is feasible in detecting.