Abstract: The cosite interference is aggravated when several frequency-hopping (FH) radios arc located on the same platform, and the small hop-set used in this condition results in low FH gain. The constraints in the in asynchronous FH networks with cosite restriction include constraints within subnets, constraints among subnets and no interference of the synchronization constraints,and cost function is based on the above analysis. The application of the simulated annealing (SA) algorithm was improved by the characteristic of the violations of the constraints. The method of frequency assignment problems (FAPs) in the asynchronous FH networks with cosite constraints was presented and the computing resups indicate this method can realize the FH communications in the full-band with given minimum gap. This approach gave a method to actualize the advantages of FH communications.

Key words: Frequency assignment,FH communications,Cosite interference,Asynchronous networks,Full-band