Time Information Transmission Based on FM Broadcast Signal

Zhaopeng Hu,Yu Xiang,Shifeng Li

doi:10.1109/access.2021.3050410

Abstract

The wireless communication technology is now widely used in many different applications. For example: communication, surveying and mapping, navigation and national defense and other fields. However, the frequency resources of wireless communication are becoming more and more tense, especially the related time service means used for time transmission, satellite time service, short wave time service and other technologies have been very mature. As a new time service method, time transmission using FM broadcasting additional channel will not occupy new frequency resources, nor will it interfere with the original audio broadcasting A very useful technique. In this paper, we propose a new method for transmitting time information through an additional frequency modulation (FM) broadcasting channel, based on the existing FM broadcasting technology. As a result, the transmission and reception technology required is mature and readily available, which makes this approach accessible as well as affordable. A field test was conducted, which demonstrated that the proposed method is feasible and accurate. This method meets the channel conditions and is conducive to accurate acquisition and tracking of the receiving end. This approach is expected to achieve higher accuracy, of sub-millisecond order, than existing methods, which will make it suitable for applications such as regional and battlefield formation time synchronization signal systems.

Highlights

Since the timing technology was first developed, various timing techniques have played an important role in a wide range of applications
This is followed by a 2 bit timing frame number, 0–3, which indicates the order of the data sent this second and is arranged in the time message
We considered the advantages and characteristics of additional Frequency modulated (FM) broadcasting channels and developed a new time service method

Summary

INTRODUCTION

Since the timing technology was first developed, various timing techniques have played an important role in a wide range of applications. The time information code is modulated by the SCA modulator to the 67 or 92 kHz carrier in the additional channel of the FM broadcast, by means of the spread spectrum It can be mixed with the original audio program signal of the FM broadcast and transmitted through the exciter and FM broadcast transmitter. TIMING INFORMATION The time message takes 4 s per frame and the 11-bit Baker code is modulated at the start of each second to facilitate capture and tracking of signals and the output of the 1PPS This is followed by a 2 bit timing frame number, 0–3, which indicates the order of the data sent this second and is arranged in the time message. It is used to deal with the error time delay from each link in the FM broadcasting time service system [26], [27]

TIMING ACCURACY TEST

CONCLUSION