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GPS synchronous IRIG-B time code generator

A generator and time code technology, which is applied in the direction of instruments, measuring devices, radio wave measuring systems, etc., can solve problems such as large logic resources and technical complexity, and achieve the effect of simple device structure, high precision, and guaranteed synchronization accuracy

Inactive Publication Date: 2009-09-30
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

The technology of this scheme is relatively complicated, and requires large logic resources. In addition, it also requires analog circuit design such as DAC and LPF.

Method used

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  • GPS synchronous IRIG-B time code generator
  • GPS synchronous IRIG-B time code generator
  • GPS synchronous IRIG-B time code generator

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with accompanying drawings and examples.

[0034] The overall circuit framework of the IRIG-B code generator is as follows Figure 4 As shown, it is composed of a GPS receiver 1, a single chip microcomputer 2, a DC B code generation circuit 3, a DC code to AC code conversion circuit 4 and a crystal oscillator circuit 5. The positioning and timing information (1 frame per second) of the NMEA-0183 format serially output by the GPS receiver 1 is connected to the serial port of the single-chip microcomputer 2 and input to the RXD pin, and the single-chip microcomputer 2 is responsible for decoding to obtain information such as UTC date, time and leap second, and according to these The information completes the encoding of the current IRIG-B data frame, that is, the corresponding 100x2-bit symbol data (each symbol corresponds to 2 bits) is generated inside the single-chip microcomputer 2 .

[0035] ima...

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Abstract

The invention discloses a GPS synchronous IRIG-B time code generator, which comprises a GPS receiver, a singlechip, a direct current B code generating circuit and a direct current code to alternating code switching circuit. The direct current B code generating circuit generates direct current B codes and 1 kHz square wave signal P1k which is synchronous with a second pulse signal, the direct current code to alternating code switching circuit performs low-pass filtering and phase-shifting correcting treatments on the square wave signal P1K to obtain a 1 kHz sinusoidal carrier having same frequency and phase with the square wave signal P1K, and the direct current B codes are used for performing amplitude modulation on the sinusoidal carrier to obtain alternating current B codes. The GPS synchronous IRIG-B time code generator obtains high-precision direct current B codes by adopting a hardware synchronization frequency division technique and generates high-precision alternating current B codes by adopting filtering, phase correction and amplitude modulation techniques and the complete device has a simple structure and is easy for popularization and application.

Description

technical field [0001] The invention relates to the technical field of industrial automation time synchronization, in particular to an IRIG-B time code generator for GPS synchronization. Background technique [0002] At present, various automation equipment in industrial automation sites such as power plants, substations, and wireless communication base stations need to maintain precise time synchronization with UTC time. After the GPS time service main device obtains UTC time information (including 1PPS pulse signal and time data sent by serial port) from the satellite, it mainly uses pulse signal, RS-232 / RS-485 serial port, IRIG-B code and network to give timing from the device. B code is a coding scheme with high timing accuracy, convenient use and large amount of information, and has been widely used in industrial fields. [0003] The B code was originally a serial format time code (hereinafter referred to as B code) formulated by the Instrument Group (IRIG, Inter-Rang...

Claims

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Application Information

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IPC IPC(8): G01S5/02
Inventor 魏丰金波魏力
Owner HUAZHONG UNIV OF SCI & TECH
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