关键词: 短波授时, 短波时号, 扩频, 相对时间间隔

Abstract: The application of spread spectrum signal in HF time service system will help to improve the quality of time service.Considering the complexity of HF channel and the limitation of system bandwidth,this paper proposes a novel scheme to transmit HF time signal based on the relative time interval between two spread spectrum signals,and analyses its feasibility.The basic technical ideas of the scheme is expounded,and then theoretical analysis is carried out to verify that compared with the conventional scheme,the proposed scheme can significantly reduce the probability of the time signal detection error of the receiver.Compared with the conventional scheme,the proposed scheme is better realized to coordinate the compatible transmission of the two HF time signals of UTC and UT1,and provide an effective way for the further research of HF time signal modulation technology based on spread spectrum system.

Key words: HF time service, HF time signal, Spread spectrum, Relative time interval