Research On Attitude Measurement Of Aircraft Based On Satellite Navigation System

With the development of aerospace industry in the world,the rapid development of various high-speed aircraft,aircraft attitude measurement has become one of the important technical problems of the control system.The traditional inertial navigation system will not be able to fully meet the needs of today's aircraft control,satellite navigation system is perfect,all-weather,no error accumulation and other advantages,its application is no longer limited to the traditional single point positioning,timing and so on.Differential technology as a new field,making the satellite navigation receiver applied to the aircraft attitude measurement possible,is the future development trend.This paper studies a technique of measuring the attitude of an aircraft using satellite navigation receivers.By receiving the satellite signal,the carrier phase to do the difference method,the solution of high-precision baseline vector,so as to determine the attitude angle to achieve the attitude of the measurement.Based on the theory,the principle of aircraft attitude measurement is introduced,and the method of measuring the attitude of the aircraft by satellite navigation receiver is determined.Secondly,the key technology of the attitude measurement of the aircraft is studied.Taking the missile as an example,the layout,the direction and the gain of the antenna are analyzed.The attitude measurement equation and the carrier phase difference technique are discussed,and the mathematical model of the attitude calculation of the aircraft is established.In this paper,the algorithm of calculating the ambiguity of the carrier phase in the posture solution is discussed,and the flow of the carrier phase ambiguities is analyzed in detail by LAMBDA algorithm.And the MATLAB simulation is used to verify and analyze the attitude angle algorithm.Describe the causes of weekly jumps and study the methods of detecting and repairing weeks.Finally,according to the above theoretical research,the design of single-baseline aircraft attitude measurement receiver hardware platform.RF front end using MAX2769 as the main chip,the antenna to receive the RF analog signal amplification,filtering,down conversion,AD conversion and other processing.The digital part adopts SOC as the core processor,and the processing of the baseband digital signal and the calculation of the attitude measurement algorithm are realized in the single chip,which improves the system integration.Through the actual test,respectively,the baseline length of five meters and 5.9 meters to measure multiple sets of data.Pitch angle and yaw angle of the measurement error is basically less than 0.5 degrees.And proves the feasibility of the research program.