Navigation Receiver Frequency Domain Interference Suppression Technology Research And Implementation

Satellite navigation and positioning technology, whether in the military, or commercial applications is of great value. Navigation and positioning satellite system can send high-precision positioning and timing information in all-day and all-weather.The information is a available to all military and civilian users. Who owns the technology, who will occupy advantage on the military, diplomatic and economic. Therefore, all countries want to obtain more accurate satellite navigation information and prevent the other accessing the satellite navigation information. Following this, more and more people research the satellite navigation system technology and anti-interference technology. In this paper, satellite navigation system technology and anti-interference technology are discussed deeply. The key work of the paper is included as fallow:1. Analysis the characteristics of navigation receiver and the characteristics of interference signal. Set up the model of the interference signals. Based on the model, discuss the anti-interference ability of satellite navigation systems. Through the computer simulation, we get the bit error rate of satellite navigation system in the interference environment.2. Study frequency domain narrowband interference suppression technology for navigation receiver and discusse how to select the parameters of it. Using the adaptive threshold filtering algorithm and frequency domain LMS filtering algorithm to suppress the narrowband interference and found some disadvantage with it. Based on the narrow-band interference characteristics, this paper uses part update weights LMS algorithm to suppress narrowband interference. A lot of simulation was done to certify that the algorithm can work very well.3. Study broadband interference suppression technology for navigation receiver. Because broadband interference signal can not be distinguished between interference and signals in the frequency domain, a time-frequency method was used to suppress the interference. Based on that, frequency-shift filter was designed to suppress broadband interference for navigation receiver. Through the simulation analysis we certify that the frequency-shift filter can suppress the broadband interference.4. Using FPGA technology, the interference suppression system for navigation receiver was made according to the theoretical analysis before. A large number of hardware simulations were done to certify the system could work well.