Emulation And Analyse Of GPS Anti-Jamming Adaptive Array

Ever since the first earth satellite has been launched successfully in October, 1975, space technology has been applied broadly in every scientific area and bringed far-reaching influence to politics, economy, military even all human society. Thereby GPS becomes the third new economic rising point after GSM and network all over the world, because of its all weather, high degree of accuracy, automation and high efficiency. Future battle must be high-technological digital battle, but advanced navigation and position technology is the key . guarantee of the digital battle.As a universal navigation and position system, GPS has many advantages superior to other navigation and position equipment, such as its all weather characteristic, high degree of accuracy, automation and high efficiency. But some of its disadvantages make GPS receiver attacked possibly by some potential factors. As a result, not only GPS interrelated technology but also GPS anti-jamming technology need to be studied in order to meet the needs of modern information battle. Therefore in this paper GPS anti-jamming technology is studied in depth, the study content with an eye to improve the anti-jamming ability of GPS receiving antenna array.First, this paper analyses the study actuality of GPS anti-jamming in all study institution throughout the world and the feasibility of interfering GPS signal is theoretically analyzed according to the composing of GPS and the structure and characteristics of its signal. Afterward, the existing GPS anti-jamming form is analyzed by combining the jamming form and effect, the anti-jamming measure is decided by combining prepositive filtering with adaptive antenna array. Next, power inversion arithmetic is chose to be the core arithmetic of the GPS anti-jamming antenna array by comparing PI arithmetic and MUSIC(Mutiple Signal Classification) arithmetic. The mathematic model of PI arithmetic is analysed. The width of the nulls in the array's direction graph is widen by combining the MUSIC arithmetic and PI arithmetic; at the same time, the depth of the nulls is improved by introducing the eigen-space thinking into the PI arithmetic. After that, PI arithmetic is not only fit for anti the strong jamming, but also the weak jamming. The validity of the two thoughts is proved by the emulation results. Last the specific systemic method is put forward. The array unit, the beam-formation unit and the adaptive arithmetic controlling unit are studied in detail. And the testing results of all critical parts are also given in the paper.