The Speed Measurement And Angle Measurement Of Microwave Radar In Lunar Orbit Rendezvous And Docking

With the increasingly rapid pace of China’s lunar exploration,study the rendezvousand docking (RVD) of the two spacecraft in the lunar orbit has become increasinglyimportant,it is the key technologies that must be addressed in the lunar explorationprogram.Generally speaking, RVD include two porcesses: rendezvous and docking,it isthe prerequisite to achieve the task of in-orbit assembly,materialssupply,maintenance.etc.Form the perspective of the measurement,the RVD is a process of actually trackingspacecraft to constantly adjust the relative distance,velocity and angle between it andthe target spacecraft,usually using radar measurement when the relative distance isfar,and when the distance is near using the optical sensor.This paper focuses on thealgorithms of speed measurement and angle measurement in the RVD remotesegments,on the basis of analysis of the sources of error in the measurement,interestingin the affects which phase noise to the velocity precision and multipath to thegoniometer.The paper is organized as follows:first analyzes the background and research statusof the RVD measurement system,and show the major content of this paper on thecharacteristics of the lunar orbit relative to the earth orbit.Then focuses on the RVDbasic measurement theory,including bi-directional asynchronous incoherent ranging,multi baseline angle measurement method and the error sources in RVD measurementsystem. Based on the characteristics of the lunar orbit and related measurement theory,in the third chapter focuses on the analysis of the affect of phase noise to bi-directionalasynchronous velocimetry, derive the theoretical results and build a simulationmodel,the last two parts of the thesis study the multi-baseline angle measurementmethod, including the the defuzzification in phase angle measurement and the effect ofmultipath to angel measurement between the target spacecraft and the trackingspacecraft.The paper has certain guiding significance and practical value to build a lunar RVDmeasuring system,including given the detailed results and analysis of the affect of the phase noise to velocity measurement and multipath to angle measurement,then providebasis results for further study. The fourth chapter propose a new away of solve fuzzymethod in goniometer:mean filter dualband method,as one of the innovation of thispaper,the method can still keep good defuzzification performance in a higher phasemeasurement error and longer goniometer baseline,so it can be well apply in the lunarorbit RVD goniometer module.