Study Of INS/GPS/SAR Integrated Navigation System

INS/GPS/SAR integrated navigation system have promoted widespread interest in the field of navigation. In this paper, the overall frame and the key techniques of INS/GPS/SAR integrated navigation system are studied through a large amount of simulations, the design of the simulations in this paper strive to close with the practice, so many modals and the parameters in these modals are chosen from practice. The main research contents are summarized as follows:1. The development of integrated navigation system and the application of multi-sensor data fusion used in integrated navigation system are introduced first, then the development of INS/GPS/SAR integrated navigation system is introduced emphatically.2. The main characteristic of INS/GPS/SAR integrated navigation system is studied, then the overall frame of whole the system is given. Since the simulations to the whole system and many key subsystems are given in this paper, the projects to each simulations are also given in this paper.3. The key techniques of INS/GPS integrated subsystem are studied and the results of simulation are also analyzed at the same time, for example, in this paper, a flight-track generator is designed since it is necessary to use a flight-track generator like this in the simulation of integrated navigation system based on inertial navigation system. The algorithm of strapdown inertial navigation system is also discussed and then use the flight-track generator to give a simulation, since a closedloop feedback integrated navigation system is designed in this paper, and the output of the filter must feed back to the strapdown inertial navigation system, the analysis of the algorithm in strapdown inertial navigation system is important. The scheme to design the trajectory of GPS and the simulation of GPS constellation are then studied, the simulation of GPS constellation is given from the calculation of vernal equinox base on the principle of celestial mechanics, this method of different from other methods given by other paper and is useful to the research of satellite navigation system. A new method to abstract noise modal in integrated navigation system is proved to be useful in practice, this method, which is given by use the principles of stochastic processes, statistics, time series analysis, and system identification, is suitable for the Kalman Filter in integrated navigation system.4. The motion compensation problem, which is one of the important problems in Synthetic Aperture Radar is discussed in this paper, the method to install three accelerometers in the center of the antenna is discussed in detail.5. Give the introduction of the INS/SAR image matching navigation system, especially the principle and the design. The method to establish the digital map is useful and by using this method, a geographical information system based on digital map of xian by the ratio of 1:10000 is established, many kinds of information is categorized and managed by different layers in this system. It is a good way for fast query by these layers.6. A closed loop feedback cascade INS/GPS/SAR integratednavigation system is designed and give simulation. The INS/GPS integrated subsystem is studied in deep, then discuss the application of the multi-sensor data fuse in INS/GPS/SAR integrated navigation system.Through the analysis in this paper, it can prove that INS/GPS/SAR integrated navigation system is a system of high reliability, independence, fault-tolerance and navigation precision.