RVD Microwave Measurement Radar Pseudo-code Synchronization

Rendezvous radar sensor mainly used to measure the relative position of the spacecraft, is an important sensor which is used to achieve the required rendezvous and docking of two or more spacecraft in orbital positions and within a predetermined time. GNC using the relative information (distance, speed, angle and angular velocity) between the two spacecraft to get closer and closer with the minimum fuel consumption,within the relative distance range from tens of meters to hundreds of kilometers.Due to the higher rate of pseudorandom signal and sharp autocorrelation characteristics, the receiver can be used to the related detection,to improve the distance measuring accuracy, enhance anti-jamming capability, greatly increase the measured distance. Currently the spacecraft rendezvous radar measurement systems use spread spectrum pseudocode measuring system to meet system requirements.Pseudo-code synchronization is an important part of rendezvous radar receiver signal processing part.this thesis which based on the actual needs of project, researched the rendezvous radar pseudo-code synchronization technology,the research include the following parts:rendezvous radar measuring principle analysis; radar signal characteristic analysis; m code autocorrelation and power spectrum characteristics analysis; capture and tracking the m-sequence spread spectrum code signals under the rendezvous of high dynamic environment; verify the correctness of algorithm on the digital signal processing platform which bsased on FPGA hardware design; analyze and resolve system exists problems based on test results.