Method and device for decoding time information of BPL (broadband over power line) receiver

Abstract

The invention relates to a method and device for decoding time information of a BPL (broadband over power line) receiver. The method is technically characterized by comprising the following steps of: performing 12bit A / D (analog / digital) sampling conversion on a received BPL long wave time service signal, and performing digital filtering and other preprocessing; carrying out carrier removal by using a Costas loop to acquire carrier phase modulation information of the BPL long wave time service signal; performing relevant frequency mixing on the BPL long wave time service signal which is subjected to the sampling and filtering processing; and filtering out a high frequency component by using a FIR (far infrared) low pass filter, sending data to a DSP (digital signal processor) along an I / Q branch, wherein the DSP performs phase verification, loop filtering and other processing mainly according to the data of the I / Q branch so as to control and process a carrier tracking loop. When the method for decoding the time information, provided by the invention is used for encoding the BPL long wave time service signal, the decoding error rate at a signal-to-noise ratio (SNR) of more than or equal to 5dB is more than 0.05 percent, and the timing uncertainty of a 1PPS timing signal generated by the standard time information which is acquired by decoding is less than or equal to 200ns.

Description

technical field [0001] The invention relates to a BPL receiver time information decoding method and a device thereof, belonging to the field of electronic circuits, and relates to a timing device time data information decoding method and a device thereof, in particular to a BPL receiver time information decoding method and a device thereof. Background technique [0002] BPL long-wave timing system my country's high-precision large-scale land-based radio timing system, its broadcast standard time UTC (NTSC), the broadcast pulse group repetition period (GRI) is 60ms, the peak power of the broadcast antenna radiation pulse ≥ 1100KW, ground wave signal The timing accuracy is better than ±1μs, and the ground wave signal frequency calibration accuracy is better than ±5×10 -12 / day, ground wave signal coverage radius ≥ 1100km, which has the advantages of wide coverage, strong anti-interference ability, low construction cost and can be used as a satellite-based augmentation system. ...

AI Technical Summary

Problems solved by technology

[0004] However, the PO21 type BPL full-automatic long-wave timing frequency calibration receiver commonly used in China lacks the time data information decoding function. To realize the timing function, it must first implement rough synchronization with the help of a third party (such as short-wave), and then perform related TOC operations. To achieve the final timing function, its shortcomings such as cumbersome operation have seriously affected the use of users

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