Abstract:

In the case of small angle pitch and roll，a small magnetic heading measurement system is designed to solve the problems of large volume and weight，high power consumption，complex of error compensation algorithm and high price in the existing magnetic heading measurement system. The system makes the error compensation come ture by using constitute digital solvable platform，which consists of 32 bit high-speed processing chip with DSP instructions(AVR32UC3B0256),a new inclination sensor（SCA100T）and a solidstate magnetic sensor (HMC1022). The experimental data show that the maximum error value of the magnetic heading measurement is ±1.4 in the level of the state when pitch angle is less than 30°or roll angle is less than 35°，the magnetic heading output error changes very little as the angle increases the maximum error are 3.7°and 2.8°respectively；when pitch angle exceeds 30°，or roll angle exceeds 35°，the magnetic headingoutput error increases rapidly. The results show that the system is capable to calculate magnetic heading angle more accurately in the case of small angle pitch and roll.

Key words: magnetic heading system, AVR32, digital solvable platform, error compensation