Initial downlink signal synchronization method of marisat system

Abstract

The invention relates to a wireless communication technology and discloses an initial downlink signal synchronization method of a marisat system, which has strong antijamming capacity, is stable and reliable and can search rapidly. The method provided by the invention adopts a strength judging way to eliminate influence from interference signals; as abrupt types of interference signals are the same with HMSCH information channel signals of a local beam, but strength of the interference signals is weaker than that of the HMSCH information channel signals of the local beam, the HMSCH information channel signal must appear once within a multiframe circulation, so that the probably real position of the HMSCH information channel signal of the local beam is found if an HMB type signal with strongest signal strength is found in one multiframe circulation; and the initial position of the HMSCH information channel signal can be located accurately by the characteristics of an SCH signal and a BCCH signal and the position relationship between the SCH signal and the HMSCH signal and between the BCCH signal and the HMSCH signal in one multiframe circulation after a frequency deviation value in a receiving signal is computed and then eliminated. The initial downlink signal synchronization method of the marisat system is applicable to initial downlink signal synchronization for a user terminal in the marisat system.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to an initial downlink signal synchronization method of a maritime satellite communication system. Background technique [0002] With the rapid development of wireless communication technology, satellite communication, as an important supplement to ground communication, increasingly reflects its importance; the maritime satellite communication system is a practical system integrating global maritime routine communication, distress and safety communication, special and combat readiness communication. Sexual high-tech products. [0003] After the user terminal of the maritime satellite communication system is turned on, it first needs to perform a local beam search. During the search process, it needs to obtain the timing position information of the satellite downlink signal. After the initial downlink signal synchronization is completed, the satellite broadcast information can be ...

AI Technical Summary

Problems solved by technology

[0004] In the traditional technology, the initial downlink signal synchronization is completed by confirming the position of the HMSCH channel signal. However, due to the existence of various interference signals in the actual channel, it is not reliable to simply correlate the HMSCH channel signal to determine its true position. In the case of severe interference, it takes a long time to complete the initial synchronization by using this method, or even the initial synchronization cannot be completed.

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