Research Of G Function Algorithm Of Differential Frequency Hopping System

The advantages of strong anti-interference, random address selection make shortwave frequency hopping(FH) communication have a wide application in the area of military. With harder and harder of countermeasures analysis, more and more disadvantages of traditional shortwave FH communication system is found, so the new shortwave FH system is demanded. Differential Frequency Hopping(DFH) technique has more advantages in contrast to traditional FH technique. DFH communication technique is a new type of FH communication technology. Relativity is imported to FH frequency sequence, so it has capability of interference resistance and fiding resistance innatly. Using DFH technique, the High Frequency(FH) radio may overcome spectral band limited, multipath fiding and interference badly etc. With the development of electronic technology and digital signal processing, DFH communication technique is applied abroadly. G function algorithm is the key technique of DFH communication technique, which involves FH pattern and modulation and demodulation etc. It's also the main subject to solve in this paper. After deep research on DFH communication system, the mathematic mode of G function is set up. The process of generating transmission frequency sequence is Markove process. This ensures the science of the algorithm. To test the validity, the transmission frequency sequence generated from the G function is simulated by MATLAB program. At last, the K.Pearson Chi-siquare test is used to test the equality character of the frequency sequence. The smooth periodogram average method is used to test the randomicity of the frequency sequence. All tests are realized by computer simulation and the simulation result proved the algorithm is useful. At last, the capability of anti-jamming is analyzed.