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1PPS (pulse per second) latch and control method

A latch, signal control technology, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as drift and affecting timing performance

Active Publication Date: 2013-07-10
北斗天汇(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long distance from the satellite transmitting signal to the receiving end, in the process of signal transmission, it is generally affected by different sources such as ephemeris error, wireless link transmission attenuation, multipath effect, external interference, bit error and delay jitter. Interference will cause the drift of the 1PPS signal. If the 1PPS phase cannot be accurately identified, it will directly affect the timing performance

Method used

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  • 1PPS (pulse per second) latch and control method
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  • 1PPS (pulse per second) latch and control method

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Embodiment Construction

[0027] Such as figure 1 As shown, the embodiment of the 1PPS latch of the present invention includes a clock frequency multiplication module 001, a phase detector 002, a floating-point DSP (digital signal processor) 003, a second-order digital filter 004, and a voltage-controlled oscillator 005. The clock multiplication module 001 multiplies the local clock frequency to control the operating frequency of the phase detector 002 and improve the effect of the local 1PPS signal tracking the satellite 1PPS signal. It can be adjusted according to the performance parameters of different local clock systems. In this embodiment, the multiplied frequency reaches 4 multiplied, 200 MHz.

[0028] The phase detector 002 performs phase detection on the 1PPS signal input by the satellite signal receiver and the local 1PPS signal, and outputs the phase difference between the two signals.

[0029] The floating-point DSP 003 converts the output phase difference signal of the phase detector 002 ...

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Abstract

The invention discloses a 1PPS (pulse per second) latch which comprises a clock frequency multiplication module, a phase discriminator, a floating point DSP (digital signal processor), a two-order digital filter and a voltage-controlled oscillator. The satellite 1PPS and local 1PPS input by a receiver are subjected to phase discrimination; the phase difference output by the digital phase discriminator is subjected to data type conversion and then output to the two-order digital filter; the result output by the two-order digital filter is subjected to data type conversion and then output to the voltage-controlled oscillator; and the voltage-controlled oscillator generates local 1PPS. The invention also provides a control method using the latch.

Description

technical field [0001] The invention relates to a signal latch and a control method, in particular to a latch and a control method for 1PPS signal comparison. Background technique [0002] Satellite navigation systems are mainly used for navigation, positioning and timing. Cesium atomic clocks are usually installed on satellites, which can provide high-precision synchronous pulse signals, including pulse-per-second signals (1PPS for short). Because the satellite clock system has the characteristics of long-term stability and insensitivity to changes in external factors, various systems gradually adopt the time signal and frequency signal provided by the satellite as the clock reference of the system. [0003] Usually there is a local clock in the system. When the satellite signal is abnormal or unavailable, the system can automatically switch the time signal source, and rely on the built-in high-stable crystal oscillator to continue to provide high-reliability time and frequ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B17/02H03H17/02
Inventor 刘忠华李大勇王振伟
Owner 北斗天汇(北京)科技有限公司
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