High-speed frequency hopping synchronization method which does not rely on external clock reference

Abstract

The invention discloses a high-speed frequency hopping synchronization method which does not rely on an external clock reference. A three-level searching structure is adopted; various levels of frequency hopping synchronization indicate next-level frequency points, so apriori information is provided for the next-level frequency points, and efficiency of next-level frequency hopping synchronization capturing is improved; searching is performed on a limited frequency point set in the first-level frequency hopping synchronization, and, compared with full-frequency-band blind searching, the searching can effectively shorten searching time; the second-level frequency hopping synchronization adopts reasonable-number limited frequency point sets. So a characteristic of frequency point randomness is presented, and the complexity of implementation is considered at the same time; the third-level frequency hopping synchronization can achieve synchronization of a frequency hopping pattern and receiving time at the same time; synchronization sequences carried by the various-level frequency hopping synchronization frames are preferably sequences having good related characteristics, and then efficiency of synchronization detection is improved; and, compared with the prior art, the high-speed frequency hopping synchronization method does not need an accurate clock to control time of both sides, has good concealment performance and short waiting time, and can guarantee precision of the synchronization capturing.

Description

Technical field [0001] The present invention relates to the technical field of frequency hopping synchronization in a frequency hopping communication system, and in particular to a high-speed frequency hopping synchronization method that does not rely on an external clock reference. Background technique [0002] Frequency hopping synchronization is the core of the frequency hopping communication system. Frequency hopping synchronization should meet the following requirements: the synchronization establishment time is fast, and the synchronization system itself has strong anti-interference and anti-interception capabilities. Commonly used frequency hopping synchronization methods include: precise clock method, which uses a high-precision clock to control the frequency hopping patterns of both the sender and receiver in real time; the synchronization header method, which places the synchronization header with synchronization information in the frequency hopping signal, and the rece...

AI Technical Summary

Problems solved by technology

The precise clock method has the characteristics of fast synchronization and good confidentiality, but the synchronization of frequency hopping patterns is easily affected by uncertain factors such as clock stability and movement distance changes.

[0003] The synchronous head method has the characteristics of easy implementation and high reliability, but its anti-interference and concealment are relatively poor

[0004] The self-synchronization method has the characteristics of strong concealment, but it takes a long time to establish synchronization