Design And FPGA Implement Of Anti-jamming Filter And Code Acquisition Of Spread Spectrum Signal In Airspace

The technology of Direct Sequence Spread Spectrum has the virtue of anti-jamming and high confidentiality . It can achieve high-precision measurement and code division multiple access communication , with which rapid acquisition is the key of spread-spectrum systems . Though the spread spectrum system has the ability of anti-jamming itself,but the strong interference can make a serious deterioration of system performance,significantly affect the accuracy of code-acquisition , or even can not acquisition . Therefore, adaptive antenna array can be used to carry out anti-jamming filter to enhance the anti-jamming ability of the system before the code-acquisition after the receiver had received signal. At the same time, anti-jamming filter may bring some impact into the code-acquisition of spread-spectrum signals,this problem also needs to be analyzed.This paper is based on the research topic of "GPS receiver of airspace anti-jamming" . From the point of code-acquisition of spread-spectrum signals,making use of simulative data,this paper carry out MATLAB simulation about adaptive antenna arrays of anti-jamming filtering and code-acquisition,analysis the impact on spread spectrum signal acquisition by different anti-filtering programs, determine FPGA design,implement the design in ISE using specific VHDL program and compare the result through Modelsim simulation , provide technical support for determining design of the research topic of "GPS receiver of airspace anti-jamming".