Geomagnetic Detection And The Detection Technology Of The Gps Composite Roll Attitude

The purpose of the research of this paper is to grope for the application of the technology of geomagnetism detection and GPS in "two-dimensional trajectory correct fuze". The trajectory correct fuze can work well if the information of azimuth and attitude is got correctly and in time during the pill flying, so that it can attack the target precisely. The earth is surrounded by the geomagnetism. The geomagnetism is stable and has some regulation. The GPS can provide highly accurate information of position, speed and time for the carrier in the global area. This paper research the key technology of the integration navigation system based on geomagnetism detection and GPS.The part that detects magnetic data of attitude in this design is using high precision magnetoresistive sensor. The signal of attitude is processed in requested time and requested precision. And the GPS receiver gets the projectile's information of position, speed and time based on the position principle of GPS, then the direction angle and pitching angle when the projectile was projected will be confirmed. At last, the system works out the result of the attitude.The two-dimensional geomagnetism detection system is designed by using two-axes magnetoresistive sensor and C8051 single chip, including its geomagnetism signal detecting circuitry, set/reset circuitry and signal modulate circuitry.The paper firstly designed the GPS signal receiving circuit based on GPS module (u-blox LEA-4H), and a system including software and hardware based on MCU is designed, the interface is designed then. It is approved to work well, and the result is correspondingly perfect.