Research On The Pseudolite Augmentation System And Its Protection Technology

Though GPS is the most advanced navigation and positioning system presently, it still cannot fulfil all the requirements of location information, which include accuracy, availability and integrity etc. Further more, the weak receive signal makes GPS vulnerable to low-power interference and/or jamming. So it is necessary to search on the problems about GPS augumentation and protection. Pseudolite is the very effective way to enhance GPS.This paper focuses on the problems of the pseudolite augumentation system, include the navigation algorithm, pseudolites' location, and anti-jamming. Firstly, the conception of pseudolite is given, also the principle and the key technologies. Secondly, this paper puts forward the navigation algorithm of pseudolite agumentation system, analyzes and computes the problem of APLs' location, and the simulation validates the efficiency and practicality of the GPS augmentation with pseudolites. Finally, this papar also studies the protection of pseudolites augmentation system, especially researches on the anti-jamming effect of the smart antenna in the pseudolite augmentation system, simulates and analyzes the performance of the diffirent adaptative arithmetics.