Key. Bombs Contained The Gps Space For Access To Information Technology

With the development of science and technology, precision attack is the key for countries in the world to find a foothold in the future war, the use of satellite positioning technology to improve the accuracy of conventional ammunition in the fight has become a hot research around the world at this time.In China, there are still a number of technical difficulties in using satellite positioning technology on conventional ammunition.Based on the introduction of application of ways of satellite positioning technology in munitions in foreign countries and domestic reaserch status of satellite positioning technology, the main technical difficulties in using satellite positioning technology in conventional ammunition are analyzed. Mainly according to rapid positioning, rapid reacquisition and anti-electromagnetic interfere, the corresponding solutions are proposed.Aiming at the technical requirements of GPS receiving antenna of the ammunition, a conformal with the bomb ring microstrip antenna is designed.Considering the technical requirements of missile-borne satellite positioning system for fast positioning and rapid recapture, the overall structure of the hardware of the GPS receiver module based on integrated RF chip, FPGA and DSP development board is built.The RF front-end module circuit, digital correlator module circuit, interface circuit between each module and system power supply circuit are respectively designed. The function of the system software is divided, the overall structure and internal sub-module of the digital correlator suitable for the parallel FFT frequency fast acquisition are mainly designed,the software process of the navigation solution module, the choice of discriminator algorithms and determination of loop filter parameters in carrier tracking loop and code tracking loop are introduced.By means of the existing GPS module, the location test of the ring microstrip antenna is done.The antenna is verified to meet the application requirements.The Quartus and Modelsim as the development of FPGA are combined to be used as simulation tools, in which the important simulation modules of the digital correlator are simulated and analyzed. The correctness of the design scheme is verified. The measurements and tests of the RF front-end module circuit and digital circuit are carried out, the designed circuit is verified.