CN102323741A - Pulse per second (PPS) signal generating device for vehicle-mounted equipment - Google Patents
Pulse per second (PPS) signal generating device for vehicle-mounted equipment Download PDFInfo
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- CN102323741A CN102323741A CN201110183992A CN201110183992A CN102323741A CN 102323741 A CN102323741 A CN 102323741A CN 201110183992 A CN201110183992 A CN 201110183992A CN 201110183992 A CN201110183992 A CN 201110183992A CN 102323741 A CN102323741 A CN 102323741A
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Abstract
The invention provides a pulse per second (PPS) signal generating device for vehicle-mounted equipment. The PPS signal generating device comprises a hardware part and control software, wherein a constant-temperature crystal oscillator, an external error signal interface, calibrated equipment, and a transmission bus interface of the hardware part are respectively connected with a PPS signal generating module; in the hardware part, the PPS signal generating module is taken as a core, the constant-temperature crystal oscillator is used for supplying a signal source to the PPS signal generating module, the external error signal interface is used for providing error calibration signals for the PPS signal generating module, and the PPS signals generated through the PPS signal generating module are sent to the calibrated equipment through the transmission bus interface for PPS calibration; and the control software is arranged in an FPGA (Field Programmable Gate Array) of the PPS signal generating module and is used for synthesizing the PPS signals, acquiring error data, and performing transmission delay calculation on the PPS signals and conversion control on the interfaces. The PPS signal generating device provided by the invention can be used for providing the PPS signals with higher cost performance for the calibrated equipment and has the advantages of simple structure, low cost, stable performance and the like.
Description
Technical field
The invention belongs to the correction device technical field, be specifically related to a kind of used for vehicle-carrying equipment pps pulse per second signal generating apparatus.
Background technology
The pps pulse per second signal that at present a lot of equipment are used is all produced by the GPS receiver, and this pps pulse per second signal exists stochastic error and transmission error, and directly use cost is high, and signal Processing is complicated.Particularly under the not high situation of pps pulse per second signal accuracy requirement, cause the design resource waste, but also need carry out the multiple interfaces conversion, use trouble.In order to overcome above-mentioned shortcoming, a kind of used for vehicle-carrying equipment pps pulse per second signal of ad hoc meter generating apparatus.
The Chinese patent document databse has announced that a kind of name is called the application for a patent for invention of " a kind of clock source device and control method thereof based on the GPS pulse per second (PPS) " (number of patent application 201010261347.3); This patented claim discloses a kind of clock source device and control method based on the GPS pulse per second (PPS); Utilize the close loop negative feedback control principle; The output frequency of VCXO is controlled on its nominal frequency, supplies the measuring system multiple devices to use synchronously.Experimental result shows that VCXO receives after the closed-loop control, and its cumulative errors can be controlled within several pulses.This patented claim error is bigger, realizes trouble, and utilizes the GPS cost higher.
Summary of the invention
Need carry out interface conversion in order to solve prior art generation calibration pps pulse per second signal, repeatedly revise filtering repeatedly; Use deficiencies such as trouble; Lower design cost, make the calibration pulse per second (PPS) use and be simple and easy to usefulness, the present invention provides a kind of used for vehicle-carrying equipment pps pulse per second signal generating apparatus.
Used for vehicle-carrying equipment pps pulse per second signal generating apparatus of the present invention comprises hardware components and Control Software, and hardware components contains pps pulse per second signal generation module, constant-temperature crystal oscillator, external error signaling interface, is calibrated equipment, transfer bus interface, power supply; Constant-temperature crystal oscillator, external error signaling interface, be calibrated equipment, transfer bus interface and be connected with the pps pulse per second signal generation module respectively; Hardware components is a core with the pps pulse per second signal generation module; Power supply is supplied power to total system; Constant-temperature crystal oscillator provides signal source for the pps pulse per second signal generation module; The external error signaling interface provides the signal that calibrates for error to the pps pulse per second signal generation module, gives the calibration that the equipment of being calibrated carries out pulse per second (PPS) through the pps pulse per second signal that the pps pulse per second signal generation module produces through the transfer bus interface; Control Software is arranged in the FPGA module of pps pulse per second signal generation module, and synthetic, the error information that is used for pps pulse per second signal obtained, the pps pulse per second signal transmission delay calculates and the conversion and control of interface.
Constant-temperature crystal oscillator output signal frequency among the present invention is 10MHz.
FPGA in the pps pulse per second signal generation module among the present invention adopts CPLD to substitute.
Used for vehicle-carrying equipment pps pulse per second signal generating apparatus of the present invention utilizes the pps pulse per second signal generation module to synthesize the signal of constant-temperature crystal oscillator input; Produce the pps pulse per second signal of 1PPs; Utilize the external error interface to carry out outside benchmark second pulse signal the error checking of 1s then; Thereby calibrate, can give the equipment of being calibrated through the pps pulse per second signal after the calibration.
The pps pulse per second signal generation module of used for vehicle-carrying equipment pps pulse per second signal generating apparatus of the present invention utilizes FPGA or CPLD, and the transfer bus interface is ISA or pci interface.
External error signaling interface among the present invention is the RS232 EBI.
Mobile unit among the present invention is X86 computing machine, DSP, ARM, PowerPC.
External error signaling interface among the present invention need utilize the RS232 phy chip to be combined into the RS232 bus.
The ISA of the transfer bus among the present invention directly is connected with the equipment of being calibrated, and pci interface need use the converting interface chip to be connected with the equipment of being calibrated.
Used for vehicle-carrying equipment pps pulse per second signal generating apparatus reliability of the present invention is high, precision is high, cost is low, interface flexibility is strong.
Description of drawings
Fig. 1 is a used for vehicle-carrying equipment pps pulse per second signal generating apparatus hardware configuration schematic block diagram of the present invention.
Fig. 2 is a used for vehicle-carrying equipment pps pulse per second signal generating apparatus software flow pattern of the present invention.
Among the figure, 1. pps pulse per second signal generation module 2. constant-temperature crystal oscillators 3. external error signaling interfaces 4. are calibrated equipment 5. transfer bus interfaces 6. power supplys.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Fig. 1 is a used for vehicle-carrying equipment pps pulse per second signal generating apparatus hardware configuration schematic block diagram of the present invention.As shown in Figure 1; Used for vehicle-carrying equipment pps pulse per second signal generating apparatus of the present invention; Comprise hardware components and Control Software, hardware components contains pps pulse per second signal generation module 1, constant-temperature crystal oscillator 2, external error signaling interface 3, is calibrated equipment 4, transfer bus interface 5, power supply 6; Constant-temperature crystal oscillator 2, external error signaling interface 3, be calibrated equipment 4, transfer bus interface 5 and be connected with pps pulse per second signal generation module 1 respectively; Hardware components is a core with pps pulse per second signal generation module 1; Power supply 6 is supplied power to total system; Constant-temperature crystal oscillator 2 provides signal source for pps pulse per second signal generation module 1; 3 pairs of pps pulse per second signal generation modules 1 of external error signaling interface provide the signal that calibrates for error, and give the calibration that the equipment of being calibrated 4 carries out pulse per second (PPS) through the pps pulse per second signal that pps pulse per second signal generation module 1 produces through transfer bus interface 5; Control Software is arranged in the FPGA module of pps pulse per second signal generation module 1, and synthetic, the error information that is used for pps pulse per second signal obtained, the pps pulse per second signal transmission delay calculates and the conversion and control of interface.
Described constant-temperature crystal oscillator 2 output signal frequencies are 10MHz.
FPGA in the said pps pulse per second signal generation module 1 adopts CPLD to substitute pps pulse per second signal generation module 1 main CPLD of employing or FPGA of the present invention, and global clock adopts the signal of constant-temperature crystal oscillator 2 inputs.
External error signaling interface 3 of the present invention is RS232 EBIs.
The equipment 4 that is calibrated of the present invention can be various types of X86 supervisory computers, DSP, ARM, PowerPC.
External error signaling interface 3 of the present invention need utilize the RS232 phy chip to be combined into the RS232 bus.
The ISA of transfer bus interface 5 of the present invention can directly be connected with the equipment of being calibrated, and pci interface need use the converting interface chip to be connected with the equipment of being calibrated.
Fig. 2 is a used for vehicle-carrying equipment pps pulse per second signal generating apparatus software flow pattern of the present invention.As shown in Figure 2, used for vehicle-carrying equipment pps pulse per second signal generating apparatus of the present invention powers on and brings into operation, and pps pulse per second signal generation module 1 receives constant-temperature crystal oscillator 2 signals; Count then, after counting through 10000000 times, can obtain pulse per second (PPS) 1PPs signal; Carry out phase place and time difference contrast through signal with 3 inputs of external error signaling interface; Find out difference, after revising, can give the equipment of being calibrated and calibrate.
During used for vehicle-carrying equipment pps pulse per second signal generating apparatus software design of the present invention, the pps pulse per second signal that produces at pps pulse per second signal generation module 1 and the signal of external error signaling interface 3 inputs carry out phase place and the time difference when contrasting, and idiographic flow is following:
Aspect signal length; If the signal length of external error signaling interface 3 inputs is
; The pps pulse per second signal length that pps pulse per second signal generation module 1 produces is
; Error in length is
, can get
Can get by formula 1
Be corrected value thereby can get
; This value can be used as calibrating signal output, and this length signals can obtain through adding and subtracting to dash second when counting;
Aspect signal length; If the signal phase of external error signaling interface 3 inputs is
; The pps pulse per second signal phase place that pps pulse per second signal generation module 1 produces is
; Phase error is
, can obtain
Can get by formula 3
（4）
From the phase place that formula 4 can be known
after being correction, this phase signal can obtain through phase shift.
Pps pulse per second signal error in length in the used for vehicle-carrying equipment pps pulse per second signal generating apparatus of the present invention
can repeatedly be obtained and long preservation with phase error
; Obtain mean value then and proofread and correct the pps pulse per second signal that pps pulse per second signal generation module 1 produces; After proofreading and correct; Can remove external error signaling interface 3, directly call the error amount of having preserved during use.
Claims (3)
1. used for vehicle-carrying equipment pps pulse per second signal generating apparatus; It is characterized in that: described device comprises hardware components and Control Software, and hardware components contains pps pulse per second signal generation module (1), constant-temperature crystal oscillator (2), external error signaling interface (3), is calibrated equipment (4), transfer bus interface (5), power supply (6); Constant-temperature crystal oscillator (2), external error signaling interface (3), be calibrated equipment (4), transfer bus interface (5) and be connected with pps pulse per second signal generation module (1) respectively; Hardware components is a core with pps pulse per second signal generation module (1); Power supply (6) is supplied power to total system; Constant-temperature crystal oscillator (2) provides signal source for pps pulse per second signal generation module (1); External error signaling interface (3) provides the signal that calibrates for error to pps pulse per second signal generation module (1), gives the calibration that the equipment of being calibrated (4) carries out pulse per second (PPS) through the pps pulse per second signal that pps pulse per second signal generation module (1) produces through transfer bus interface (5); Control Software is arranged in the FPGA module of pps pulse per second signal generation module (1), and synthetic, the error information that is used for pps pulse per second signal obtained, the pps pulse per second signal transmission delay calculates and the conversion and control of interface.
2. used for vehicle-carrying equipment pps pulse per second signal generating apparatus according to claim 1 is characterized in that: described constant-temperature crystal oscillator (2) output signal frequency is 10MHz.
3. used for vehicle-carrying equipment pps pulse per second signal generating apparatus according to claim 1 is characterized in that: the FPGA in the said pps pulse per second signal generation module (1) adopts CPLD to substitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110183992A CN102323741A (en) | 2011-07-04 | 2011-07-04 | Pulse per second (PPS) signal generating device for vehicle-mounted equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110183992A CN102323741A (en) | 2011-07-04 | 2011-07-04 | Pulse per second (PPS) signal generating device for vehicle-mounted equipment |
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| CN102323741A true CN102323741A (en) | 2012-01-18 |
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|---|---|---|---|
| CN201110183992A Pending CN102323741A (en) | 2011-07-04 | 2011-07-04 | Pulse per second (PPS) signal generating device for vehicle-mounted equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407511A (en) * | 2014-12-11 | 2015-03-11 | 哈尔滨工程大学 | High-precision multipath timing module for navigation system and method for acquiring timing system signal without accumulated errors |
| CN104536284A (en) * | 2014-10-10 | 2015-04-22 | 北京空间机电研究所 | Clock management circuit of remote sensing camera |
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| CN1312472A (en) * | 2000-10-30 | 2001-09-12 | 华中科技大学 | Synchronous transient-process recording method and device |
| US6711230B1 (en) * | 2002-09-27 | 2004-03-23 | Nortel Networks Limited | Reference timing signal oscillator with frequency stability |
| CN101738933A (en) * | 2009-12-24 | 2010-06-16 | 中国航空工业集团公司第六三一研究所 | High-precision timing system and timing method thereof |
| CN101930211A (en) * | 2010-08-24 | 2010-12-29 | 西安交通大学 | Clock source device based on GPS second pulse and control method thereof |
-
2011
- 2011-07-04 CN CN201110183992A patent/CN102323741A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312472A (en) * | 2000-10-30 | 2001-09-12 | 华中科技大学 | Synchronous transient-process recording method and device |
| US6711230B1 (en) * | 2002-09-27 | 2004-03-23 | Nortel Networks Limited | Reference timing signal oscillator with frequency stability |
| CN101738933A (en) * | 2009-12-24 | 2010-06-16 | 中国航空工业集团公司第六三一研究所 | High-precision timing system and timing method thereof |
| CN101930211A (en) * | 2010-08-24 | 2010-12-29 | 西安交通大学 | Clock source device based on GPS second pulse and control method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104536284A (en) * | 2014-10-10 | 2015-04-22 | 北京空间机电研究所 | Clock management circuit of remote sensing camera |
| CN104407511A (en) * | 2014-12-11 | 2015-03-11 | 哈尔滨工程大学 | High-precision multipath timing module for navigation system and method for acquiring timing system signal without accumulated errors |
| CN104407511B (en) * | 2014-12-11 | 2017-02-22 | 哈尔滨工程大学 | Multipath timing module and method for acquiring timing system signal without accumulated errors |
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Application publication date: 20120118 |