CN201828785U - Beidou/GPS dual-mode time service module - Google Patents

Beidou/GPS dual-mode time service module Download PDF

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Publication number
CN201828785U
CN201828785U CN 201020563118 CN201020563118U CN201828785U CN 201828785 U CN201828785 U CN 201828785U CN 201020563118 CN201020563118 CN 201020563118 CN 201020563118 U CN201020563118 U CN 201020563118U CN 201828785 U CN201828785 U CN 201828785U
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module
gps
frequency
signal
big
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CN 201020563118
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水孝敏
孟宪伟
王宇
桂岳
曾洁
李应彬
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Anhui Sun Create Electronic Co Ltd
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Anhui Sun Create Electronic Co Ltd
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Abstract

The utility model discloses a beidou/GPS dual-mode time service module which consists of a dual-mode receiving radio-frequency module, a beidou satellite baseband module, a GPS module and a power module. By combining with a beidou/GPS dual-mode system, and integrated design of sampling radio-frequency baseband, a radio-frequency module outputs a beidou intermediate-frequency signal through down-conversion twice, the baseband module adopts an ARM+FPGA structure, and a dual-mode PPS can output GPS second pulse and beidou second pulse which are selected and determined by an ARM module through a serial port. The beidou/GPS dual-mode time service module adopts dual-mode radio-frequency baseband integrated design technology to effectively fuse time service of double systems of beidou satellite and GPS, so as to improve reliability and precision of the system, and reduce dependence on a single navigation system; and the beidou/GPS dual-mode time service module can output a PPS signal, UTC and other information, and has the advantages of open/short-circuit detecting and protecting functions, low cost, small volume, light weight, low power consumption, convenience in being embedded in the interior of equipment needing time service, and the like.

Description

The Big Dipper/GPS bimodulus time service module
Technical field
The utility model relates to a kind of bimodulus satellite time service module, and receive the Big Dipper simultaneously No. one, gps satellite signal is specially adapted to the fields such as production scheduling robotization of digital synchronous network construction, national information network security, electric power, belongs to satnav time service field.
Background technology
The high precision clock source is the guarantee of modern communications and information security, its importance for national security and economic development is self-evident, and its cost performance optimum of high precision time service mode of other class is compared in the satellite time service, so all numerous and confused investment construction in various countries satellite system independently.China all is to adopt GPS as the clock source in a lot of industries (as: communication, electric power etc.) at present basically, but owing to be subjected to the policy implication of the U.S., if we are only by relying on external satellite system as the clock source, the security of clock can't be guaranteed, and must have very big potential safety hazard.So for the accurate time transmission industry, make full use of have China's independent intellectual property right satellite system of the Big Dipper as China high precision clock source, adopt the Big Dipper/GPS bimodulus Service of Timing will be China now and development in future trend.
The utility model content
Problem to be solved in the utility model is to utilize existing big-dipper satellite positioning system and GPS positioning system, adopt bimodulus radio frequency baseband integrated design technology, big-dipper satellite, the time service of GPS dual system are effectively merged, improve system reliability and precision, reduce dependence single navigational system.
The technical solution of the utility model is as follows:
The Big Dipper/GPS bimodulus time service module, by bimodulus received RF module, the big-dipper satellite baseband module, GPS module and power module are formed, it is characterized in that: described bimodulus received RF module is by power splitter, Big Dipper radio-frequency module and local oscillator are formed, described power splitter is divided into gps signal and Big Dipper satellite signal two-way to the signal that receives through antenna, and be transported to GPS module and Big Dipper radio-frequency module respectively, comprise amplifilter in the described Big Dipper radio-frequency module, first frequency mixer, bandpass filter, second frequency mixer and automatic gain control module, two signals of described local oscillator output are sent into described Big Dipper radio-frequency module;
Described big-dipper satellite baseband module is made up of FPGA module and ARM module, described FPGA module is connected in series mutually with described ARM module, link to each other by the AD sampling module between described FPGA module and the described Big Dipper radio-frequency module, described FPGA module is circumscribed with the FLASH module, and described ARM module has the UART serial ports;
Described GPS module output GPS information is also sent into described FPGA module; Also include crystal oscillator, the output signal of described crystal oscillator is sent into described local oscillator, and described FPGA module output frequency is finely tuned control signal and sent into described crystal oscillator by the DA module; The voltage output end of described power module links to each other with the power end of big-dipper satellite baseband module, GPS module and crystal oscillator respectively.
The described Big Dipper/GPS bimodulus time service module, it is characterized in that: described power splitter, first and second frequency mixer, bandpass filter, local oscillator and automatic gain control module split in a radome.
The described Big Dipper/GPS bimodulus time service module, it is characterized in that: the circuit board of the Big Dipper/GPS bimodulus time service module adopts two-sided fabric swatch, wherein the same side is installed or be mounted on to bimodulus received RF module and big-dipper satellite baseband module, and the same side is installed or be mounted on to GPS module and power module.
The described Big Dipper/GPS bimodulus time service module is characterized in that: described bimodulus received RF module provides the GPS radiofrequency signal and through the big-dipper satellite 12.24MHz intermediate frequency baseband signal after twice down-converted.
The described Big Dipper/GPS bimodulus time service module is characterized in that: described big-dipper satellite baseband module is handled the baseband signal of 12.24MHz intermediate frequency, and its sample frequency of baseband signal is 48.96MHz, and ARM handles frequency 75MHz.
The beneficial effects of the utility model:
The utility model adopts bimodulus radio frequency baseband integrated design technology, and big-dipper satellite, the time service of GPS dual system are effectively merged, and has improved system reliability and precision, has reduced the dependence to single navigational system; Information such as when the exportable PPS signal of the utility model, UTC has out the short-circuit detecting defencive function, cost is low, volume is little, in light weight, low in energy consumption, conveniently be embedded into the advantages such as device interior that need time service.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Referring to Fig. 1, the Big Dipper/GPS bimodulus time service module, by bimodulus received RF module, the big-dipper satellite baseband module, GPS module 105 and power module are formed, bimodulus received RF module is by power splitter 101, Big Dipper radio-frequency module 102 and local oscillator 103 are formed, can receive satellite-signal of the Big Dipper and gps satellite signal simultaneously, receive frequency is respectively the 2491.75MHz of No. one, the Big Dipper, the 1575.42MHz of GPS, wherein Big Dipper signal is through twice down-converted: signal frequency is 881.68MHz after the down coversion, signal frequency is 12.24MHz after the secondary down coversion, local oscillator 103 provides two local frequencies that double conversion is handled to be needed, and its frequency configuration is finished by the setting of IIS bus by FPGA module 109; Power splitter 101 is divided into gps signal and Big Dipper satellite signal two-way to the signal that receives through antenna, and is transported to GPS module 105 and Big Dipper radio-frequency module 102 respectively.Power splitter 101 also has out short-circuit detecting and defencive function simultaneously.Be provided with the amplifilter, first frequency mixer, bandpass filter, second frequency mixer and the automatic gain control module that are in series successively in the Big Dipper radio-frequency module 102, two local oscillation signals of local oscillator 103 are sent into Big Dipper radio-frequency module 102 respectively, Big Dipper radio-frequency module 102 output differential intermediate frequency are given AD module 106, differential level is 1VPP, and the datum of difference is provided by AD module 106.
The big-dipper satellite baseband module is made up of FPGA module 109 and ARM module 108, utilize altera corp's chip and atmel corp's chip to finish integrated circuit (IC) design, after being handled by radio-frequency module, its signal input, finishes the function of Big Dipper base band signal process, Big Dipper signal resolution, time service pulse per second (PPS) generation through providing after the A/D sampling; FPGA module 109 is connected in series mutually with ARM module 108, links to each other by AD sampling module 106 between FPGA module 109 and the Big Dipper radio-frequency module 102, and FPGA module 109 is circumscribed with FLASH module 110, and ARM module 108 has the UART serial ports; FPGA module 109 receives A/D sampling (sample frequency is set to 48.96MHz by the FPGA module) signals, and signal is caught, followed the tracks of and synchronously; After simultaneously signal being carried out demodulation, despreading and Vertibi decoding, the satellite almanac data that solves is offered ARM module 108; ARM module 108 is utilized and is received satellite almanac data (position and the velocity information that comprise satellite, and electromagnetic wave propagation correction model parameter etc.), and local position information, obtaining the received signal lag of per second through the derivation match delays time accurately, thereby derive the precise time of per second, and data are sent back to FPGA module 109; FPGA module 109 for producing high accurate clock signal, adopts counter and comparer that the high precision crystal oscillator is carried out frequency division in clock synchronization circuit, produces crystal oscillator clock signal second; Crystal oscillator clock second carries out bit comparison mutually with Big Dipper clock second, produces biased sequence; FGPA module 109 also is responsible for producing a NCO module and is carried out frequency trim, the regulation and control amount of frequency trim is the control signal of sending here from ARM module 108, make the signal of NCO output both have the frequency high stability of local crystal oscillator, possess at every moment phase-locked high frequency accuracy again with dipper system; FPGA module 109 receives GPS module 105 information simultaneously, and according to the PPS of the information decision output that receives, it still is Big Dipper PPS information that the output of PPS also can be selected output GPS module 105PPS information by serial ports by ARM module 108.
GPS module 105 adopts the Ublox-5 series module to finish the gps signal recovery and PPS produces, and GPS module 105 output GPS information are also sent into FPGA module 109; Also include crystal oscillator 104, the output signal of crystal oscillator 104 is sent into local oscillator 103, and FPGA module 109 output frequencies are finely tuned control signal and sent into crystal oscillator 104 by DA module 107;
Power module 111 adopts the LTC3564 chip that the 3.3V external power supply is converted to 1.2V, 1.8V and 2.5V direct supply, wherein 1.2V, 2.5V offer FPGA module 109,1.8V offer ARM module 108, bimodulus received RF modular power source is 3.3V and 5V, is directly provided by external power supply.
Power splitter 101, first and second frequency mixer, bandpass filter, local oscillator and automatic gain control module split in a radome.
The circuit board of the Big Dipper/GPS bimodulus time service module adopts two-sided fabric swatch, and wherein the same side is installed or be mounted on to bimodulus received RF module and big-dipper satellite baseband module, and the same side is installed or be mounted on to GPS module 105 and power module 111.
Bimodulus received RF module provides the GPS radiofrequency signal and through the big-dipper satellite 12.24MHz intermediate frequency baseband signal after twice down-converted.
The big-dipper satellite baseband module is handled the baseband signal of 12.24MHz intermediate frequency, and its sample frequency of baseband signal is 48.96MHz, and ARM handles frequency 75MHz.
The utility model is described in further detail below in conjunction with specific embodiment:
The signal that radio-frequency module is received separates satellite-signal of the Big Dipper and gps signal through power splitter, and wherein gps signal is exported to the GPS module; Satellite-signal of the Big Dipper enters the High Amplifier Circuit of receiving cable circuit, the signal that height is put output through first frequency mixer and first local oscillator after, by the intermediate-freuqncy signal that intermediate-frequency filter takes out 872.1MHz, exporting second frequency mixer to after amplifying through variable gain again.After the mixing for the second time of a satellite-signal process of the Big Dipper, the RF conversion of signals of reception is that centre frequency is two intermediate-freuqncy signals of 12.24MHz.After second intermediate frequency filtering and output driving amplification, this signal exports baseband circuit to, and is coupled to the AGC loop, through after the detection, controls the gain of putting in by loop control circuit, realizes that the automatic gain of receiving cable is controlled.All local oscillators of channel circuit are phase-locked loop frequency synthesizer, adopt same reference frequency signal.Through buffer compartment from after, this reference frequency signal exports baseband circuit to as required as clock signal.
The FPGA module is responsible for receiving the intermediate-freuqncy signal of A/D sampling (sample frequency is 48.96MHz), and to signal catch, tracking and clock synchronization; In clock synchronization circuit, for producing high accurate clock signal, adopt counter and comparer that the high precision crystal oscillator is carried out frequency division, produce crystal oscillator clock signal second; Crystal oscillator clock second carries out bit comparison mutually with Big Dipper clock second, produces biased sequence; FGPA also is responsible for producing a NCO module and carries out frequency trim, the regulation and control amount of frequency trim is the control signal of sending here from the ARM module, make the signal of NCO output both have the frequency high stability of local crystal oscillator, possess at every moment phase-locked high frequency accuracy again with dipper system.Simultaneously, the FPGA module also is responsible for signal is carried out demodulation, despreading, after Vertibi decoding, the satellite-signal that solves is transferred to the ARM module, and (data transmission interface between ARM module and the FPGA module is two-way ram port, therefore need customize the two-way RAM of ARM module in the FPGA inside modules), the I branch road navigation message data that the utilization of ARM module receives, and current code element the bit ordinal number of corresponding frame, can obtain accurate clock, again in conjunction with the position and the velocity information of the satellite that obtains in local position and the navigation message, and electromagnetic wave propagation correction model parameter, can obtain accurate moment of current pulse per second (PPS) correspondence.
The GPS module adopts the Ublox-5 series module to finish the gps signal recovery and pulse per second (PPS) (PPS) produces; Power module adopts the LTC3564 chip that the 3.3V external power supply is converted to 1.2V, 1.8V and 2.5V direct supply, and wherein 1.2V, 2.5V offer the FPGA module, and 1.8V offers the ARM module, and the radio-frequency module power supply is 3.3V and 5V, is directly provided by external power supply.Here, the Big Dipper/two-sided fabric swatch of GPS bimodulus time service module board, the same side is installed or be mounted on to bimodulus received RF module and big-dipper satellite baseband module, and the same side is installed or be mounted on to GPS module and power module.

Claims (5)

1. the Big Dipper/GPS bimodulus time service module, by bimodulus received RF module, the big-dipper satellite baseband module, GPS module and power module are formed, it is characterized in that: described bimodulus received RF module is by power splitter, Big Dipper radio-frequency module and local oscillator are formed, described power splitter is divided into gps signal and Big Dipper satellite signal two-way to the signal that receives through antenna, and be transported to GPS module and Big Dipper radio-frequency module respectively, comprise amplifilter in the described Big Dipper radio-frequency module, first frequency mixer, bandpass filter, second frequency mixer and automatic gain control module, two signals of described local oscillator output are sent into described Big Dipper radio-frequency module;
Described big-dipper satellite baseband module is made up of FPGA module and ARM module, described FPGA module is connected in series mutually with described ARM module, link to each other by the AD sampling module between described FPGA module and the described Big Dipper radio-frequency module, described FPGA module is circumscribed with the FLASH module, and described ARM module has the UART serial ports;
Described GPS module output GPS information is sent into described FPGA module and described ARM module; The output signal of described crystal oscillator is sent into described local oscillator, and described FPGA module output frequency is finely tuned control signal and sent into described crystal oscillator by the DA module; The voltage output end of described power module links to each other with the power end of big-dipper satellite baseband module, GPS module and crystal oscillator respectively.
2. the Big Dipper according to claim 1/GPS bimodulus time service module, it is characterized in that: described power splitter, first and second frequency mixer, bandpass filter, local oscillator and automatic gain control module split in a radome.
3. the Big Dipper according to claim 1/GPS bimodulus time service module, it is characterized in that: the circuit board of the Big Dipper/GPS bimodulus time service module adopts two-sided fabric swatch, wherein the same side is installed or be mounted on to bimodulus received RF module and big-dipper satellite baseband module, and the same side is installed or be mounted on to GPS module and power module.
4. the Big Dipper according to claim 1/GPS bimodulus time service module is characterized in that: described bimodulus received RF module provides the GPS radiofrequency signal and through the big-dipper satellite 12.24MHz intermediate frequency baseband signal after twice down-converted.
5. the Big Dipper according to claim 1/GPS bimodulus time service module is characterized in that: described big-dipper satellite baseband module is handled the baseband signal of 12.248MHz intermediate frequency, and its sample frequency of baseband signal is 48.96MHz, and ARM handles frequency 75MHz.
CN 201020563118 2010-10-15 2010-10-15 Beidou/GPS dual-mode time service module Expired - Fee Related CN201828785U (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
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CN102253638A (en) * 2011-08-12 2011-11-23 北京电子工程总体研究所 Frequency stability control and compensation method for automatically keeping time in complex environment
CN102323744A (en) * 2011-08-12 2012-01-18 北京电子工程总体研究所 High-precision and independent time-keeping type ground time service instrument used on ground in complex environment
CN103227655A (en) * 2013-03-29 2013-07-31 电信科学技术第四研究所 Wireless transmission system and transmission method based on compass navigation satellite system and WCDMA
CN103344969A (en) * 2013-07-09 2013-10-09 北京理工大学 Dual-mode navigator with GPS receiving mode and plough receiving mode
CN104166146A (en) * 2014-01-08 2014-11-26 芜湖市振华戎科智能科技有限公司 Dual-mode navigation receiver based on Beidou-2 and GPS
CN104301052A (en) * 2014-10-20 2015-01-21 中国电子科技集团公司第四十一研究所 Seamless collecting and real-time frequency spectrum monitoring implementation method based on FPGA
CN104330966A (en) * 2014-10-22 2015-02-04 中国人民解放军信息工程大学 Multi-mode high-precision time and frequency standard equipment
CN104363029A (en) * 2014-11-20 2015-02-18 山东大学 Transmitting-receiving circuit system for receiving Beidou first-generation signals and Beidou second-generation signals and working method thereof
CN104375413A (en) * 2014-11-06 2015-02-25 西安交通大学 Time synchronization system and method based on GPS/BD dual-mode time service
CN105137456A (en) * 2015-07-25 2015-12-09 山东大学 Front end system and working method thereof by using second frequency mixing for simultaneously receiving GPS L1 signal and Beidou B1 signal
CN105759600A (en) * 2014-12-19 2016-07-13 云南电网公司电力科学研究院 Beidou Satellite-based power grid system time-service system
CN106301749A (en) * 2016-07-21 2017-01-04 芜湖航飞科技股份有限公司 A kind of time synchronization device for electrical power system based on dipper system
CN106292267A (en) * 2016-07-28 2017-01-04 武汉纳时科技有限公司 A kind of GNSS high accuracy time service terminal system and time service method
CN109343331A (en) * 2018-11-16 2019-02-15 中国铁路总公司 A kind of Railway Mobile Radio time dissemination system of Beidou+GPS dual signal synchronised clock
CN110198198A (en) * 2018-02-27 2019-09-03 深圳市金溢科技股份有限公司 A kind of roadside unit synchronous method, device, processor and roadside unit
CN110780658A (en) * 2019-09-23 2020-02-11 大唐陕西发电有限公司西安热电厂 System and method for accurately recording fault time of DCS (distributed control system) card
CN114994727A (en) * 2022-07-18 2022-09-02 成都迅翼卫通科技有限公司 Equipment for realizing high-precision time calibration and satellite positioning

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102253638A (en) * 2011-08-12 2011-11-23 北京电子工程总体研究所 Frequency stability control and compensation method for automatically keeping time in complex environment
CN102323744A (en) * 2011-08-12 2012-01-18 北京电子工程总体研究所 High-precision and independent time-keeping type ground time service instrument used on ground in complex environment
CN103227655A (en) * 2013-03-29 2013-07-31 电信科学技术第四研究所 Wireless transmission system and transmission method based on compass navigation satellite system and WCDMA
CN103227655B (en) * 2013-03-29 2016-04-13 电信科学技术第四研究所 Based on wireless transmitting system and the transmission method of the Big Dipper and WCDMA
CN103344969A (en) * 2013-07-09 2013-10-09 北京理工大学 Dual-mode navigator with GPS receiving mode and plough receiving mode
CN104166146A (en) * 2014-01-08 2014-11-26 芜湖市振华戎科智能科技有限公司 Dual-mode navigation receiver based on Beidou-2 and GPS
CN104301052A (en) * 2014-10-20 2015-01-21 中国电子科技集团公司第四十一研究所 Seamless collecting and real-time frequency spectrum monitoring implementation method based on FPGA
CN104330966A (en) * 2014-10-22 2015-02-04 中国人民解放军信息工程大学 Multi-mode high-precision time and frequency standard equipment
CN104330966B (en) * 2014-10-22 2017-02-08 中国人民解放军信息工程大学 Multi-mode high-precision time and frequency standard equipment
CN104375413A (en) * 2014-11-06 2015-02-25 西安交通大学 Time synchronization system and method based on GPS/BD dual-mode time service
CN104375413B (en) * 2014-11-06 2017-01-11 西安交通大学 Time synchronization system and method based on GPS/BD dual-mode time service
CN104363029B (en) * 2014-11-20 2016-08-24 山东大学 A kind of receive Big Dipper generation signal and the transmission circuit system of Beidou II signal and method of work thereof
CN104363029A (en) * 2014-11-20 2015-02-18 山东大学 Transmitting-receiving circuit system for receiving Beidou first-generation signals and Beidou second-generation signals and working method thereof
CN105759600A (en) * 2014-12-19 2016-07-13 云南电网公司电力科学研究院 Beidou Satellite-based power grid system time-service system
CN105137456A (en) * 2015-07-25 2015-12-09 山东大学 Front end system and working method thereof by using second frequency mixing for simultaneously receiving GPS L1 signal and Beidou B1 signal
CN105137456B (en) * 2015-07-25 2017-11-14 山东大学 It is a kind of that the front end system and its method of work for receiving GPS L1 signals and Big Dipper B1 signals simultaneously are realized using secondary mixing
CN106301749A (en) * 2016-07-21 2017-01-04 芜湖航飞科技股份有限公司 A kind of time synchronization device for electrical power system based on dipper system
CN106292267A (en) * 2016-07-28 2017-01-04 武汉纳时科技有限公司 A kind of GNSS high accuracy time service terminal system and time service method
CN106292267B (en) * 2016-07-28 2019-08-02 武汉纳时科技有限公司 A kind of GNSS high-precision time service terminal system and time service method
CN110198198A (en) * 2018-02-27 2019-09-03 深圳市金溢科技股份有限公司 A kind of roadside unit synchronous method, device, processor and roadside unit
CN109343331A (en) * 2018-11-16 2019-02-15 中国铁路总公司 A kind of Railway Mobile Radio time dissemination system of Beidou+GPS dual signal synchronised clock
CN110780658A (en) * 2019-09-23 2020-02-11 大唐陕西发电有限公司西安热电厂 System and method for accurately recording fault time of DCS (distributed control system) card
CN114994727A (en) * 2022-07-18 2022-09-02 成都迅翼卫通科技有限公司 Equipment for realizing high-precision time calibration and satellite positioning
CN114994727B (en) * 2022-07-18 2022-12-02 成都迅翼卫通科技有限公司 Equipment for realizing high-precision time calibration and satellite positioning

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