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Method for controlling and producing AC code of IRIG-B as time synchronization standard by FPGA (field programmable gata array)

A time synchronization and AC code technology, applied in the field of time synchronization standards, can solve the problems of high cost, poor B code accuracy and system flexibility, and difficulty in system design, so as to improve accuracy, reduce design difficulty, and improve system flexibility. sexual effect

Active Publication Date: 2011-12-14
上海瑞强信息科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing AC codes (AC codes) are realized based on MCU or DSP and digital logic circuits. This method still has many shortcomings: the design of the system is very difficult, the cost is high, the accuracy of the B code and the flexibility of the system Disadvantages such as poor sex

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  • Method for controlling and producing AC code of IRIG-B as time synchronization standard by FPGA (field programmable gata array)
  • Method for controlling and producing AC code of IRIG-B as time synchronization standard by FPGA (field programmable gata array)
  • Method for controlling and producing AC code of IRIG-B as time synchronization standard by FPGA (field programmable gata array)

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Embodiment Construction

[0016] The structural schematic diagram of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] The present invention adopts the FPGA design method through the research on the IRIG-B code. Using the DC code stream of IRIG-B, the AC code digital sequence of 1KHz sine wave for amplitude modulation is first generated by the FPGA, and then the AC code stream of IRIG-B is generated after the DAC, that is, AC modulation is realized on the basis of the DC code. to get the AC code.

[0018] The DC code stream format of IRIG-B is as follows: figure 2 As shown, it is a time string code of one frame per second, each symbol width is 10ms, and a time frame period includes 100 symbols, which are pulse width codes. A pulse width of 0.2ms represents a binary 0, a pulse width of 0.5ms represents a binary 1, and a pulse width of 0.8ms represents a position identifier or reference symbol.

[0019] The AC code stream for...

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Abstract

The invention relates to a method for controlling and producing an AC code of an IRIG-B as a time synchronization standard by a FPGA (field programmable gata array), which comprises the following steps: a DC code stream of the IRIG-B passes through the FPGA, then an AC code number sequence for amplitude modulation of a sine wave (1KHz) is produced; the AC code number sequence passes through a DAC, then an AC code stream of the IRIG-B is produced; and the FPGA carries out level discrimination on the DC code stream of the IRIG-B, wherein 'H' means that the high level part synchronously triggersa phase accumulator 1, the sample data of a sine wave of which the peak value of a voltage peak is 10V is stored in a ROM 1, the output value of the phase accumulator 1 triggers the data output in the ROM 1; 'L' refers to the operation of the low level, and the operation principle of the low level is same as that of the high level. The method in the invention has the advantages that compared withthe methods implemented based on MCU or DSP and DLC (digital logic circuit), the method in the invention can greatly reduce the system design difficulty, lower the cost, and improve the accuracy of aB code and the system flexibility.

Description

[technical field] [0001] The present invention relates to the technical fields of IRIG-B and FPGA, specifically a method for generating the AC code of IRIG-B under the control of FPGA (Field Programmable Gate Array) as a time synchronization standard. [Background technique] [0002] In the range measurement, industrial control, power system measurement and protection, computing, communication, meteorological and other test equipment, the time code of the international standard IRIG-B format (B code for short) is used as the time synchronization standard, which is also a kind of telemetry implemented in my country. time standard. B code is a serial time format, which is divided into direct current code (DC code) and alternating current code (AC code). [0003] Existing AC codes (AC codes) are realized based on MCU or DSP and digital logic circuits. This method still has many shortcomings: the design of the system is very difficult, the cost is high, the accuracy of the B code...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04G7/00H03K7/02
Inventor 丁晨张柄瑶叶磊
Owner 上海瑞强信息科技有限公司