Development Of X-band Range Pulse Train Radar Transceiver System And Research On Phase Detection Speed Measurement Technolog

Pulse Doppler(PD)radar is a full phase reference pulse system radar,which has good detection performance and outstanding anti-jamming capability,and is widely used in areas such as homeland defence,traffic safety and scientific research.The transceiver system is not only an important part of the radar system,but also has a decisive influence on the radar performance.In response to the problems of high hardware cost,poor detection accuracy and low equipment reliability of traditional PD radar,the thesis designs a low-cost,small volume and highly reliable X-band distance pulse string marine radar transceiver system,and proposes an improved phase-derived velocity measurement algorithm based on chirp-Fourier transform for detecting high-speed moving targets,which provides a reference technology to meet the design of high accuracy velocity measurement radar.The main work and innovations of the thesis are as follows:(1)The current status of research on X-band radar transceiver systems at home and abroad is introduced,and the basic working principle of PD radar and key algorithms for conventional radar signal processing are elaborated.(2)According to the requirements of the subject,the overall design of the X-band distance pulse string marine radar transceiver system consists of six basic modules: reference signal source module,pulse signal source module,phase-locked loop module,transceiver module,power supply module and control module.Measurement results of the developed product show that reference source module can provide a reference signal of 1.89 d Bm@100MHz with phase noise of-159.29 d Bc/Hz@10k Hz and spurious suppression regime of >75d Bc;pulse source module using direct digital waveform synthesis can provide a 5.08 d Bm@90MHz IF signal with±1d B in-band power flatness;phase-locked loop module can provide an X-band microwave local oscillation signal with phase noise of-100.57 d Bc/Hz@10k Hz and spurious suppression of >55d Bc;transmitter module operates at 9.35-9.45 GHz and has a saturated output power of34.46 d Bm;receiver module has a super outlier structure with noise figure of <4d B,dynamic range of >90d B and sensitivity of <-91 d Bm.The main technical specifications of the developed X-band distance pulse string marine radar transceiver system can meet the design requirements,and field verification experiments have been conducted to prove that the system works well.(3)In order to improve the traditional phase-derived velocity measurement to enhance the radar detection accuracy,the basic principles and technical difficulties of phase-derived velocity measurement are analysed.An improved phase-derived velocity measurement algorithm based on chirp-Fourier transform is proposed for high-speed moving targets under low signal-to-noise conditions.Through computer simulation experiments,it is proved that the algorithm has the advantages of high measurement accuracy and strong anti-interference ability.