Data Acquisition And Processing Of Analog Channel In IPAS20 System

Magnetic airborne surveys on the vector means to measure the three components of the earth's magnetic field by installing a sensor on the airplane when it flies over some space. In order to gain accurate position and the three components of the magnetic field, an IPAS20 system has been set up to measure the airplane's position , which is made by Leica company. We could reach the aim of magnetic airborne if data from the vector and INS system are put together. Moreover, to gain the accurate gesture is an important problem to solve. Data acquisition and processing is the base for magnetic airborne system, which is also a significant part for gaining the accurate gesture.I've schemed out a data acquisition and processing system for simulate channels of LeicaIPAS20. It tends to find out the rule of gyroscope drifting through analyzing and comparing the data after acquisition and processing. We can make it up for gyroscope drifting if rules can be made use of. This may improve the accuracy of airplane gesture as well.The combination system of GNSS and INS is essential. Firstly, they are both global, comprehensive with full-time work, which offer complete navigation data to us. Secondly, not only can it overcome the shortcomings of INS and GPS, but also can it highlight the advantages. Thirdly, GNSS is a comprehensive system of navigation. Therefore, the combination system of GNSS and INS is the most perfect choice in many navigational tasks.IPAS20 system is a knocked-down system of gesture and position, which is made by Leica in Switzerland. It uses the kalman filter to put the GNSS and IMU data together, so as to gain accurate massages of gesture, position and speed. It will take two stages in this process, named kalman-evaluate and kalman-mend. IPAS20 system consists of GNSS antenna, IMU, control unit, GNSS receiver, the power, software and kinds of connector wire. In fact, IPAS20 system is a knocked-down navigational system of GNSS/INS. The kalman filter is often made use in GNSS/INS system. It obtains the accurate gesture and position massages by receiving data and putting them together. It should make it clear that GNSS in the passage refers to American GPS and Russia GLONASS system.The main aim of simulate channels of IPAS20 system is to find out the rules of gyroscope drifting after dealing with data. It needs to measure constantly in order to find out the rules, for the changing range of gyroscope drifting is very small. So I had to work constantly for 24h. I've designed two groups of experiment to find out the relationship of gyroscope drifting and environment. One group is at room temperature, while the other is in the condition of outside. The experiment happened in Changchun, lasting from 27th to 29th in January of 2010.The environment was good for observing the effect of outer temperature on gyroscope drifting. That's because the temperature varies greatly in and outside in winter.However, there're lots of data to deal with after acquisition. We should do some advance processing if we'd like to make use of the data. It refers to the instrument of data processing. Considering the property of the data, I choose MATLAB for data processing.Finally, I obtain two groups of experimental results after dealing with the data in MATLAB. I point out my own ideas by analyzing and comparing the two groups of results. It's true that environment has some effect on gyroscope drifting. Gyroscope drifting is small at room temperature, when it works stably. In the contrary, gyroscope drifting is much bigger at lower temperature outside.