Spreading codes for a satellite navigation system

The invention an embodiment of the invention claims a method for establishing the satellite constellation of the satellite navigation system for use in a spread spectrum code a method for. Constellation each satellite application comprises at least primary and secondary decoding code with layered spread spectrum code. Constellation in every satellite to be distributed from said group spread spectrum code of different spread spectrum code. The method comprises: Generates initial bit mode and wherein each bit mode can be expressed in the spread spectrum code. To the initial bit mode set in the bit mode to execute optimization processing. Used as the optimizing result of the modified or replace the initial concentration of at least part of the bit mode to create used for spread spectrum code and the final mode of bit collecting.