CN202931285U - GPS synchronous sampling circuit based on CPLD - Google Patents
GPS synchronous sampling circuit based on CPLD Download PDFInfo
- Publication number
- CN202931285U CN202931285U CN 201220602634 CN201220602634U CN202931285U CN 202931285 U CN202931285 U CN 202931285U CN 201220602634 CN201220602634 CN 201220602634 CN 201220602634 U CN201220602634 U CN 201220602634U CN 202931285 U CN202931285 U CN 202931285U
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- gps
- cpld
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- sampling
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Abstract
The utility model discloses a GPS synchronous sampling circuit based on a CPLD, comprising a master control chip CPLD, a high precision crystal oscillator and a GPS controller; an input terminal of the master control chip CPLD is respectively in connection with the high precision crystal oscillator and a pulses per second (PPS) terminal of the GPS controller; an output terminal of the master control chip CPLD is in connection with each terminal device. The GPS synchronous sampling circuit of the utility model employs a CPLD to realize high precision synchronous sampling among terminal devices in an electric power system; a GPS is used as a common time reference for each terminal device and performs genlocking on sampling pulses outputted by the high precision crystal oscillator, and thereby sampling pulses outputted to each terminal device keep time synchronization with the GPS, time errors of the sampling pulses are controlled in one second and synchronous sampling precision is substantially raised.
Description
Technical field
The utility model relates to global positioning system, refers more particularly to the synchronized sampling circuit in navigation system.
Background technology
The GPS global positioning system is the satellite system of U.S.'s emission operation, is made of three parts: deep space satellite part, ground control part and user terminal.Deep space satellite has partly comprised 27 satellites that can continue to send geographical position height above sea level and time signal, and each satellite is all continuing the radio wave that emission is loaded with satellite orbit data and time, uses for tellurian various terminals.Ground control is partly in order to follow the trail of and control above-mentioned satellite running, set ground control point, the GPS controller is set in the control point of ground, main responsible the correction with safeguarding each satellite can keep the parameters data that run well, and can provide correct message to receive to user terminal to guarantee each satellite.User terminal is followed the trail of all gps satellites, and calculates in real time coordinate, translational speed and the time of terminal position.In order to obtain the ground elements of a fix, gps system needs 4 satellite-signals at least, three latitude, longitude and height above sea levels that are used for determining gps receiver wherein, and the 4th provides the synchronous correction time.
Along with the development of electric power system, also more and more higher to the requirement of supervisory control system strange land sampling with high precision.In electric power system at present, each terminal equipment of monitoring is all complete independentlies under internal clocking is controlled, the terminal equipment that needs synchronized sampling for the strange land, because the inner crystal oscillator frequency that adopts of each terminal equipment has error, therefore cause its internal clocking cycle to produce error, cause to be difficult to realize high-precision synchronized sampling between each terminal equipment.
The utility model content
The utility model technical issues that need to address are to provide a kind of circuit that can realize that in electric power system, between each terminal equipment, high-precise synchronization is sampled.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is.
GPS synchronized sampling circuit based on CPLD, comprise main control chip CPLD, High Precision Crystal Oscillator and GPS controller, the input of described main control chip CPLD is connected with GPS controller pulse per second (PPS) output PPS with High Precision Crystal Oscillator respectively, produce the sampling pulse of required sample frequency after main control chip CPLD control High Precision Crystal Oscillator frequency division, main control chip CPLD carries out genlocing by the pulse per second (PPS) of GPS controller pulse per second (PPS) output output to sampling pulse, and each terminal equipment is exported in the employing pulse after synchronous, realize and the gps time Synchronous Sampling Pulse.
Owing to having adopted technique scheme, the technological progress that the utility model is obtained is.
The utility model adopts CPLD to realize the sampling of the high-precise synchronization between each terminal equipment in electric power system, with global positioning system as the common time reference of each terminal equipment, every one second, the sampling pulse of exporting by High Precision Crystal Oscillator is carried out genlocing, thereby make the sampling pulse of exporting to each terminal equipment keep synchronizeing with gps time; Solved existing sampling pulse asynchronous, each terminal equipment is because the increasing problem of sampling error appears in the accumulated time error of sampling pulse existence separately.Application of the present utility model is controlled at the time error of sampling pulse the error that produces in the second, has greatly improved the accuracy of synchronized sampling.
Description of drawings
Fig. 1 is the utility model theory diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further details.
Based on the GPS synchronized sampling circuit of CPLD, its schematic block circuit diagram as shown in Figure 1.Comprise main control chip CPLD, High Precision Crystal Oscillator and GPS controller, the input of main control chip CPLD is connected with GPS controller pulse per second (PPS) output PPS respectively at High Precision Crystal Oscillator, produce the sampling pulse of required sample frequency after main control chip CPLD control High Precision Crystal Oscillator frequency division, pulse per second (PPS) by GPS controller pulse per second (PPS) output (PPS) output is carried out genlocing to sampling pulse, and each terminal equipment is exported in the employing pulse after synchronous, thereby make the sampling pulse that each terminal equipment receives keep synchronizeing with gps time.
The course of work of the present utility model is as described below:
High-frequency pulse signal A by High Precision Crystal Oscillator output enters main control chip CPLD inside, produce the sampling pulse B=A/N of required frequency by frequency divider, at this moment sampling pulse B and gps time are nonsynchronous, and there is error delta/s between the sample frequency B' of sampling pulse B and actual requirement, and Δ can constantly be increased to the t* Δ along with the increase of time t, although it is very little that High Precision Crystal Oscillator produces Δ, accumulated error also can exceed the scope that error allows for a long time.
Pulse per second (PPS) PPS signal by the output of GPS controller enters main control chip CPLD inside, the sampling pulse of controlling frequency divider output by control circuit is synchronizeed with the PPS pps pulse per second signal, produce the sampling pulse B of synchronizeing with gps time, there is error delta/s between the sampling pulse B of this moment and the sample frequency B' of actual requirement, after 1 second, the sampling pulse signal of PPS pps pulse per second signal re-synchronization frequency divider output, make error delta can not increase in time, it is very little that High Precision Crystal Oscillator produces Δ, satisfies the requirement of sampling pulse precision.
Certainly, when main control chip CPLD of the present utility model carries out genlocing to the frequency of crystal oscillator output, can also be according to actual requirement, take the pulse per second (PPS) of GPS controller output as benchmark, set the sampling period of Synchronous Sampling Pulse.
Claims (1)
1. based on the GPS synchronized sampling circuit of CPLD, it is characterized in that: comprise main control chip CPLD, High Precision Crystal Oscillator and GPS controller, the input of described main control chip CPLD is connected with GPS controller pulse per second (PPS) output PPS with High Precision Crystal Oscillator respectively, produce the sampling pulse of required sample frequency after main control chip CPLD control High Precision Crystal Oscillator frequency division, main control chip CPLD carries out genlocing by the pulse per second (PPS) of GPS controller pulse per second (PPS) output output to sampling pulse, and each terminal equipment is exported in the employing pulse after synchronous realized and the gps time Synchronous Sampling Pulse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220602634 CN202931285U (en) | 2012-11-15 | 2012-11-15 | GPS synchronous sampling circuit based on CPLD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220602634 CN202931285U (en) | 2012-11-15 | 2012-11-15 | GPS synchronous sampling circuit based on CPLD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202931285U true CN202931285U (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220602634 Expired - Lifetime CN202931285U (en) | 2012-11-15 | 2012-11-15 | GPS synchronous sampling circuit based on CPLD |
Country Status (1)
| Country | Link |
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| CN (1) | CN202931285U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001632A (en) * | 2012-11-15 | 2013-03-27 | 保定浪拜迪电气股份有限公司 | CPLD-based (complex programmable logic device-based) GPS (global positioning system) synchronous sampling circuit |
| CN108168918A (en) * | 2017-12-25 | 2018-06-15 | 中铁第四勘察设计院集团有限公司 | For the synchronization control system and method for track automatic measurement vehicle synchro measure |
-
2012
- 2012-11-15 CN CN 201220602634 patent/CN202931285U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001632A (en) * | 2012-11-15 | 2013-03-27 | 保定浪拜迪电气股份有限公司 | CPLD-based (complex programmable logic device-based) GPS (global positioning system) synchronous sampling circuit |
| CN108168918A (en) * | 2017-12-25 | 2018-06-15 | 中铁第四勘察设计院集团有限公司 | For the synchronization control system and method for track automatic measurement vehicle synchro measure |
| CN108168918B (en) * | 2017-12-25 | 2019-12-27 | 中铁第四勘察设计院集团有限公司 | Synchronous automatic control system and method for synchronous measurement of automatic track measuring vehicle |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130508 |
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| CX01 | Expiry of patent term |