Research On Anti-jamming Technique Of GPS Based On Adaptive Antenna

As GPS receiver has been used in civil and military affair more and more widely. The main problem of GPS is easy to be jammed that is increasingly serious, thus the GPS receiver often works in unstable state or even can not work. For these reasons, it is very important to study the anti-jamming technology for GPS receiver.Based on the analysis of the work principles, signal characteristics, RF interference influence on GPS, and the adaptive antenna principles, the author studies the problem of anti-jamming and uses antenna array for it. The author's researches involve four aspects as follows:1. The scheme of GPS anti-jamming receiver, which is based on adaptive antenna, is put forward.2. Commence on ensuring the number of antennas in adaptive array, the thesis discusses how to choose the shape of adaptive array, analyzes the features of the line, the rectangle and the circle these three forms array concretely, and finally takes the circle array as our chosen shape.3. The algorithms of direction of arrival estimation and of the anti-jamming are studied and analyzed separately. The traditional estimation algorithm of direction of arrival and the anti-jamming algorithm are applied and extended to two-dimensional angle, then simulated. The algorithms, which contain DOA estimation and anti-jamming that satisfy the anti-jamming GPS receiver scheme based on adaptive array, are choose through simulation by computer.4. The performance of anti-jamming GPS receiver is evaluated and a satisfactory conclusion is drawn.