BPM shortwave timing signal and timing method based on Chirp signals

Abstract

The invention provides a BPM shortwave timing signal and timing method based on Chirp signals. A timing signal is obtained by combining two Chirp base band signals with zero central frequency and opposite frequency modulation numbers through a time division mode and modulating the carrier frequency, and the timing signal is used for realizing a timing function; a receiving terminal can obtain signal measurement precision higher than that of original BPM time signals and extra anti-interference gain and then obtain more reliable timing performance. The timing signal can be compatible in an original BPM shortwave timing system without affecting users of the original system in use; the timing signal has the advantages of high multi-path fading resistance, Doppler frequency shift resistance and the like and is particularly suitable for shortwave signal channels; frequency adjusting and timing can be realized for the timing signal through simple matching and filtering without a complicatedcarrier loop or code tracking loop.

Description

technical field [0001] The invention relates to the technical field of time service and information processing, in particular to a BPM short-wave time service signal and a timing method. Background technique [0002] As one of the large scientific devices, the BPM short-wave timing system is a long-range land-based radio timing service system independently mastered by my country. It has the advantages of long distance, simple receiving equipment, low price, and wartime persistence. The BPM short-wave time service system alternately broadcasts standard time and standard frequency signals at 4 frequencies (2.5MHz, 5MHz, 10MHz, 15MHz) every day. The content of the broadcast includes the UTC time number of the coordinated universal time, the UT1 time number of the universal time, empty carrier and BPM call sign. BPM timing broadcast program: (1) 59 m 00 s ~00 m 00 s and 29 m 00 s ~30 m 00 s Broadcast BPM callsign; (2)00 m 00 s ~10 m 00 s 、15 m 00 s ~25 m 00 s 、3...

AI Technical Summary

Problems solved by technology

The BPM short-wave timing signal adopts the broadcast method of fixed carrier frequency AM amplitude modulation. The poor anti-channel interference performance leads to low timing accuracy. At present, various short-wave timing receivers generally can only guarantee the absolute timing accuracy of a few milliseconds to more than ten milliseconds, even in a certain In some occasions, the short-wave timing signal cannot be received normally within a certain period of time

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