North Finding System’s Reaseaching And Implemetation Based On The MEMS Gyroscrope

Miniaturization and fast have been the hot spot and difficulty in north finding measurements. MEMS gyroscope has the advantage of low costs, accuracy, small size, low power consumption, high reliability and anti-high overload, etc. North Finding system based on MEMS gyroscope’s volume can be smaller, and easy to use.Against the background of actual engineering application, this paper expounds a low cost north finding system’s design and implementation based on MEMS gyroscope. According to the demand of the system, this paper first expounds the key technology and the common solution of the north finding system. The north finding system is designed for this paper.This paper expounds the design and implementation of the north finding system, including the system overall design, hardware design and the design of the north finding system software. Hardware design and implementation provides a hardware platform for the sensor measurement. According to the north finding software’s instructions, hardware can also execute the scheduled program. In order to make the system measured at any place, GPS is joined, we can gets the current position, include the longitude and latitude. The software of the north finding system is designed to communicate with the hardware via serial port, the software can realize the whole system’s initialization, control the system and calculate the algorithm of the north finding system.Error elimination is an important part of this paper, According to the gyroscope and accelerometer used in this paper, the error of gyroscope and acceleration are analyzed. This thesis proposes a fast field calibration algorithm for low-cost inertial sensors. According to the real test, time-various biases of inertial sensors are no apparent, thus fixed biases can be taken into account only. The proposed calibration algorithm can correct biases and scale factor errors without and external equipment.For the random error of sensors, wavelet filter is designed. wavelet transform is designed to decrease the impact of white noise, which is quantitatively analyzed using Allan variance. In order to reduce the hardware cost, the error model of the sensor, signal filtering and north finding calculating is processed in PC, effectively reduced the north finding system’s volume and cost.Finally the system experiment is conducted, verified the system design conform to the requirements of the indicators, reaches the desired effect. Through the experiment data, the result is revised, can improve the north finding accuracy.