BPM short-wave data modulation design method based on Chirp signal

A technology of data modulation and design method, which is applied in the direction of modulation carrier system, digital transmission system, electrical components, etc. It can solve the problems of difficult time code information accuracy, high risk of short-wave channel interference, and insufficient reservation of time code frame format Extended bits and other issues to achieve good anti-Doppler frequency shift, optimal design, and good anti-multipath fading effect

Active Publication Date: 2018-09-21
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

The main problems existing in the existing time code insertion scheme: (1) the data rate is low, only 1bps, and it takes 1 minute to broadcast a complete time code information, and the risk of being interfered by the shortwave channel is very high; (2) there is no time code frame format Sufficient reserved extension bits make it difficult to implement system expansion applications; (3) Without reliable verification, it is difficult for the receiving terminal to judge the accuracy of the received time code information

Method used

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  • BPM short-wave data modulation design method based on Chirp signal
  • BPM short-wave data modulation design method based on Chirp signal
  • BPM short-wave data modulation design method based on Chirp signal

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0025] The present invention adopts following technical scheme:

[0026] 1. Overall design

[0027] Such as figure 1 As shown, the newly added data modulation signal needs to be compatible with the original BPM shortwave timing system, including:

[0028] (1) Insert the data modulation in the time period of UTC time number and UT1 time number in the original BPM broadcast program, and keep the format of the original BPM time number unchanged;

[0029] (2) The interval between the start time of the first data modulation signal and the end time of the original UTC time number and UT1 time number is denoted as T G1 ; The interval between the end moment of the last data modulation signal and the initial moment of the original UTC time number and UT1 time number is denoted as...

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Abstract

The invention provides a BPM short-wave data modulation design method based on a Chirp signal, which combines the Chirp signal and MFSK to form a multi-ary Chirp signal center frequency keying (MCFSK)mode, thereby not only retaining the advantages of MFSK, but also further improving the ability of system data transmission to resist short-wave channel interference. In addition, MCFSK is cascaded with binary Chirp-rate keying to form MCFSK-2CrSK modulation, which can improve the system data transmission rate without changing the MCFSK modulation signal parameters. The invention may be compatible with the existing BPM short-wave timing system without affecting the use of the original system user. The data modulation signal provided by the invention has the advantages of good anti-multipath fading and anti-Doppler frequency shift, is suitable for the short-wave channel, and may be flexibly designed for channel characteristics and synchronization accuracy of the receiving terminal.

Description

technical field [0001] The invention relates to the technical field of communication and information processing, in particular to a BPM shortwave data modulation design method. Background technique [0002] As one of the large scientific installations, the BPM short-wave timing system is a long-distance land-based radio timing service system independently mastered by my country, and it is also the only means for the broadcast of my country's universal time correction (DUT1). 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 、30 m 00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7176H04B1/7183H04B1/719H04L27/156
CPCH04B1/7176H04B1/7183H04B1/719H04L27/156
Inventor 袁江斌赵坤娟闫温合李实锋杨朝中华宇
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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