CN102928855A - Beidou multimode time service receiving device - Google Patents
Beidou multimode time service receiving device Download PDFInfo
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- CN102928855A CN102928855A CN 201210195132 CN201210195132A CN102928855A CN 102928855 A CN102928855 A CN 102928855A CN 201210195132 CN201210195132 CN 201210195132 CN 201210195132 A CN201210195132 A CN 201210195132A CN 102928855 A CN102928855 A CN 102928855A
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Abstract
The invention discloses a Beidou multimode time service receiving device which is composed of a broadband time service active antenna and a multimode radio-frequency receiver module. According to the technical scheme of the invention, a plurality of special frequency-band time service antennas are not required to be set according to navigation satellites and frequency bands, the radio-frequency receiver module does not frequently switch local frequencies and intermediate-frequency filtering frequency points by using a time-division multiplexing technology, and frequency bands and multi-channel demodulation modes are not switched by using a tunable mode, but a programmable intermediate-frequency filter is controlled to automatically select main and standby time service signals through a storage control processor by using a software technology, so that the transmission and demodulation qualities can be ensured. According to the invention, because the time service active antenna and the multimode radio-frequency receiver module are subjected to an integrated design, a provided latest circuit design and a provided structure not only improve the flexibility and reliability of multimode time service conversion, but also extremely facilitate the reduction of renovation costs consumed for converting single-mode time services into multimode time services implemented by the existing domestic CDMA (code division multiple access) and TD-SCDMA (time division-synchronization code division multiple access) mobile communication base stations.
Description
The application is dividing an application of the original bill number of patent application is 200910073942.1, denomination of invention is on March 17th, 2009 application for a patent for invention for " big dipper multi-mode time service receiving device ", the applying date.
Technical field
The present invention relates to a kind of satellite positioning navigation multi-mode time service receiving device, be specially adapted to the mobile communication apparatus station time services such as CDMA, CDMA2000, TD-SCDMA synchronous, belong to mobile communication and satellite positioning navigation field.
Background technology
CDMA especially in Modern Mobile Communications Systems, in CDMA2000 and the TD-SCDMA mobile communication system, require the wave point of whole cellular system all to be synchronized with same etalon time, generally Position Fixing Navigation System or wire cable provide this etalon time via satellite, because NAVSTAR time service degree of accuracy is high, time delay is little, therefore in these mobile communications devices, adopt satellite time transfers more, but, foundation along with a plurality of international satellite navigational system, except the gps satellite navigational system of the U.S., other the Galileo such as European Union, in " two generations of the Big Dipper " that Muscovite GLONASS and China will soon set up, are the global location navigational system (COMPASS-M1), all incite somebody to action or entered practical stage, therefore require satellite positioning navigation or the time service service receiver of a new generation, compatible and different satellite navigation time service signals of reception simultaneously, for the user provides more stable, reliably, it is inevitable that accurate service, multisystem compatible receiver replace the triangular web receiver to become.But, the enterprise that present domestic most designs and production base station produce the radio-frequency transmitter chip with time-service active antenna and design is respectively independently, the special China that works as encourages exploitation take the Big Dipper two generations satellite navigation system as main, when having simultaneously multi-system compatible type time service radio-frequency transmitter, just should take the method for time-service active antenna and radio-frequency transmitter integrated design, select best multimode to receive design proposal." a kind of double-mode time service active antenna " patent of the previous application of applicant owing to the design of radio-frequency transmitter module is not considered as a whole interior, therefore is difficult to realize applicant's technical goal.For further improving reliability and the manufacturability of satellite time transfer, guarantee domestic CDMA and TD-SCDMA mobile communication system in the situation that the Big Dipper two generations time service conversion transformation is carried out in normal operation, reduction system conversion cost, just be necessary time-service active antenna and radio-frequency transmitter module are carried out overall planning, adopt the technology path of simplifying most, realize that above-mentioned multimode receives and compatible target.
Summary of the invention
Problem to be solved by this invention be overall planning with the Big Dipper two on behalf of the master, multi-system compatible type time-service active antenna and radio-frequency transmitter module, adopt radio frequency reception integrated design scheme, guarantee that existing mobile communication base station can receive different satellite navigation time service signals simultaneously, strive breaking away from the dependence to single satellite navigation system, improve security, reliability and the independence of China's mobile communication system network.
Big dipper multi-mode time service receiving device of the present invention is by the broadband time-service active antenna, the multi-mode radio frequency receiver module forms, the principal character of broadband time-service active antenna is: described broadband time-service active antenna is by broadband ceramic dielectric receiving antenna, band-pass filter, the low noise field-effect amplifier, broadband band-pass filter, Low Noise Amplifier MMIC, lightening surge preventing impacts circuit, the power supply mu balanced circuit, contain the double-sided printing copper-clad plate of microstrip circuit, the N-type needle electric coupler forms, this ceramic medium antenna is arranged at the one side of printing copper-clad plate, and is connected to the band-pass filter input end by lead-in wire; Band-pass filter, low noise field-effect amplifier, broadband band-pass filter, one chip amplifier and lightening surge preventing impact circuit and the power supply mu balanced circuit is positioned at the another side of printing copper-clad plate, and splits in two metallic enclosures; Band-pass filter and low noise field-effect amplifier place in the metallic enclosure, and remaining circuit places in another shielding cavity.This time-service active antenna is the application of inventor's patent 200520023991.1,200620024687.3 and 200720304839,200820228116.0,200820228123.0 in this patent.
Above-mentioned ceramic medium antenna is broad-band reception antenna, can accept simultaneously " two generations of the Big Dipper " and GPS, Galileo satellite time transfer carrier signal, and receive frequency is respectively the 1561.098MHz in " two generations of the Big Dipper " and the 1575.42MHz of GPS, Galileo.
Above-mentioned broadband band-pass filter adopts Ceramic Dielectric Filter part or SAW (Surface Acoustic Wave) device, and the frequency response bandwidth is 1550 to 1580MHz; Or adopt staggered tuning bandpass filter, wherein f
01Be the 1561.098MHz in " two generations of the Big Dipper ", f
021575.42MHz for GPS and Galileo.
Described broadband time-service active antenna important technological parameters is as follows:
(1) frequency range [MHz]: 1550-1580
(2) gain [dBi]:＞20
(3) noise figure [dB]:＜2.5@+25 ℃,＜3.0@+80 ℃
(4) Out-of-band rejection [dB]: fo=1570MHz
fo±30MHz ＞5
fo±50MHz ＞20
fo±100MHz ＞50
(5) input and output voltage standing-wave ratio (SWR) :≤2.0
(6) Anti-surging (impact) immunity to interference performance meets GB/T17626.5-1999 idt IEC61000-4-5:1995 standard
Surge waveform: CWG composite wave, 1.2/50 μ s, 8/20 μ s
Voltage peak [V]: 〉=2000
Number of pulses: 10
(7) signal time delay is less than 5ns.
The broadband time-service active antenna transfers to the multi-mode radio frequency receiver module via N-type needle electric coupler connecting coaxial cable, lightning arrester behind broadband filter and low noise amplification.
Above-mentioned multi-mode radio frequency receiver module is by the multimode narrow band filter, frequency mixer, a shared frequency comprehensive generator, the intermediate frequency integrated filter, the AGC automatic gain amplifier, the A/D analog to digital converter, access control processor, network interface, the multimode signal selector switch, signal level detecter, wideband low noise amplifier, intermediate-frequency filter able to programme, digital demodulator forms, it is characterized in that: described multi-mode radio frequency receiver module adopts the method for integrated circuit to be produced on one or two chip, wherein, frequency mixer, comprehensive frequency generator, the intermediate frequency integrated filter, the AGC automatic gain amplifier, the A/D analog to digital converter is integrated on the chip, and access control processor is integrated on another chip; Or all be integrated on the chip; Or frequency mixer, comprehensive frequency generator, multimode signal selector switch, signal level monitor, LNA wideband low noise amplifier, A/D analog to digital converter be integrated on the chip, intermediate-frequency filter able to programme, digital demodulator, access control processor are integrated on another chip; The multi-mode radio frequency receiver module is installed and is mounted on one and covers on the copper printed circuit board.
Described narrow band filter adopts Ceramic Dielectric Filter part or SAW (Surface Acoustic Wave) device to arrange respectively, and centre frequency is respectively 1561.098MHz, and bandwidth is 4.092MHz, 1575.42MHz, and bandwidth is respectively 2.046MHz and 4.092MHz.
Described intermediate frequency integrated filter is for can write the formula integrated filter; Also can adopt the discrete devices such as Ceramic Dielectric Filter or surface acoustic wave to arrange outward, its centre frequency depends on the selection of local frequency, is arranged on 1 to 30MHz.
The electric principle of described broadband time-service active antenna and multi-mode radio frequency receiver module is: the broadband time-service active antenna receives simultaneously from " two generations of the Big Dipper " and GPS, Galileo satellite time transfer carrier signal, behind low noise amplification and broadband filter, via concentric cable, lightning arrester transfers to the multi-mode radio frequency receiver module, broadband high-frequency signals is respectively through two narrow band filter filtering, produce centre frequency and be respectively 1561.098MHz and 1575.42MHz, the frequency response bandwidth is two groups of high frequency analog signals of 4.092MHz, then enter respectively frequency mixer separately, carry out the down coversion mixing with the local frequency that comprehensive frequency generator produces, produce two centre frequency differences but the identical analog intermediate frequency signal of bandwidth through mixing, because the bandwidth of GPS time signal is 2.046MHz, Galileo is 4.092MHz, therefore the wherein one group of intermediate-freuqncy signal after down coversion is comprising the time service information of GPS and two groups of satellites of Galileo simultaneously, but the spread spectrum code check is different, another group then is the Big Dipper two generations intermediate-freuqncy signal, bandwidth is 4.092MHz, two groups of intermediate-freuqncy signals enter the intermediate frequency integrated filter simultaneously, the intermediate frequency integrated filter is under the control of access control processor, automatically giving tacit consent to one of them satellite time transfer intermediate-freuqncy signal according to the centre frequency of setting and band bandwidth is main signal, other is space signal, perhaps while cut-in stand-by signal oscillator disturbs frequently to reduce self produce adjacent; Enter the AGC automatic gain amplifier through filtered intermediate-freuqncy signal, then entering A/D analog-digital demodulation device finishes analog to digital conversion and conciliates spread spectrum and resolve, digit time signal after access control processor will resolve passes through network interface, according to and the base station time synchronism machine between communication protocol and technical manual transmission time synchronizing signal, guarantee that mobile communication system is synchronized with a reference time.
Because the present invention has carried out integrated design to time-service active antenna and radio-frequency transmitter module, the up-to-date circuit design that provides and structure take full advantage of existing integrated chip technology and software radio-frequency technique, not only improve dirigibility, the reliability of multimode time service conversion, and extremely be conducive to reduce cost.The particularly operating CDMA of China, CDMA2000 and TD-SCDMA mobile communication system, be converted to the multimode time service by the time service of GPS single mode, only need to change time-service active antenna and the radio-frequency transmitter module of base station, other hardware facility can use in complete reservation, and do not increase new equipment, can significantly reduce improvement expenses.This technical scheme can also extend to the civilian or military frequency range of other satellite, also can be applicable on the multimode positioning navigation device simultaneously.
Description of drawings
Fig. 1 is big dipper multi-mode time service receiving device schematic diagram of the present invention
Fig. 2 is multi-mode radio frequency receiver module principle figure of the present invention
Embodiment
Broadband time-service active antenna circuit is by broadband ceramic medium antenna 101, prefilter 102, low noise field-effect amplifier 103, broadband filter 104, Low Noise Amplifier MMIC 105, lightening surge preventing impacts circuit 106, power supply mu balanced circuit 107, contain the double-sided printing copper-clad plate of microstrip circuit, the formations such as N-type needle electric coupler, principle of work is: broadband ceramic medium antenna 101 receives from GPS, Galileo and " two generations of the Big Dipper " satellite time transfer carrier signal, guarantee 1550 to 1580MHz Out-of-band rejections through prefilter 102 filtering, then send low noise field-effect amplifier 103 to amplify, broadband signal through amplifying enters broadband filter 104, the formation center frequency point is 1570MHz, cover simultaneously the carrier signal of 1561.098MHz and 1575.42MHz, or adopt staggered tuning one-tenth multifrequency point wideband filtered, amplify through Low Noise Amplifier MMIC 105 again, guarantee that entire gain is more than 20db, noise is below 2.5db, then by N-type needle electric coupler and the concentric cable that is connected the base station, lightning arrester connects, and transmits signals to the multi-mode radio frequency receiver module.
The multi-mode radio frequency receiver module is by narrow band filter 201, frequency mixer 202, comprehensive frequency generator 203, intermediate frequency integrated filter 204, AGC automatic gain control amplifier 205, A/D analog to digital converter 206, access control processor 207, network interface 208 formations such as grade, its principle of work is: transfer to the broadband high-frequency signals of multi-mode radio frequency receiver module respectively through two narrow band filter 201 filtering through concentric cable, produce centre frequency and be respectively 1575.42MHz and 1561.098MHz, the frequency response bandwidth is two groups of high frequency analog signals of 4.092MHz, then enter respectively frequency mixer 202 separately, carry out the down coversion mixing with the local frequency that comprehensive frequency generator 203 produces, produce two centre frequency differences through mixing, the analog intermediate frequency signal that bandwidth is identical.Because the bandwidth of GPS time signal is 2.046MHz, Galileo is 4.092MHz, therefore the wherein one group of intermediate-freuqncy signal after down coversion is comprising GPS and two groups of satellite time transfer information of Galileo simultaneously, another group then is the Big Dipper two generations intermediate-freuqncy signal, bandwidth is 4.092MHz, two groups of intermediate-freuqncy signals enter intermediate frequency integrated filter 204 simultaneously, access control processor is given tacit consent to one of them satellite time transfer intermediate-freuqncy signal automatically according to centre frequency and band bandwidth and pulse code quality, other is as for subsequent use, main signal enters AGC automatic gain control amplifier 205 after filtering, then entering A/D analog-digital demodulation device 206 finishes analog to digital conversion and resolves, pulse digit time after access control processor 207 will resolve is by network interface 208, and according to and the base station time synchronism machine between communication protocol and the technical manual set up, the time pulse synchronous transmission of signal to the base station time synchronism substrate, is guaranteed that mobile communication system is synchronized with a reference time.As shown in Figure 1.
The present invention only is explained as an example of the downlink carrier frequency parameter of current transmission example; In addition because software programmable intermediate frequency filtering and digital demodulation techniques are ripe; programmable filter software also can have different pattern and the versions write with time service digital demodulation software; even change can not change with the Big Dipper two on behalf of the compatible receiving mode of main multimode yet; therefore; all identical with principle with the present technique implementation or equivalents; its essence all falls into the row of the present invention's protection, be engaged in these those skilled in the art should with understanding.
Claims (9)
1. big dipper multi-mode time service receiving device comprises broadband time-service active antenna and multi-mode radio frequency receiver module two parts, wherein the broadband time-service active antenna is by broadband ceramic dielectric receiving antenna, band-pass filter, the low noise field-effect amplifier, broadband band-pass filter, Low Noise Amplifier MMIC, lightening surge preventing impacts circuit, the power supply mu balanced circuit, contain the double-sided printing copper-clad plate of microstrip circuit, the N-type needle electric coupler forms, it is characterized in that: described broadband ceramic medium antenna is arranged at the one side of printing copper-clad plate, and is connected to the band-pass filter input end by lead-in wire; Band-pass filter, low noise field-effect amplifier, broadband band-pass filter, one chip amplifier and lightening surge preventing impact circuit and the power supply mu balanced circuit is positioned at the another side of printing copper-clad plate, split in two metallic enclosures, band-pass filter and low noise field-effect amplifier place in the metallic enclosure, and remaining circuit places in another shielding cavity.
2. big dipper multi-mode time service receiving device according to claim 1, it is characterized in that: described ceramic medium antenna is broad-band reception antenna, and the receive frequency of this ceramic medium antenna is respectively the 1561.098MHz in " two generations of the Big Dipper " and the 1575.42MHz of GPS, Galileo.
3. big dipper multi-mode time service receiving device according to claim 1 is characterized in that: described broadband band-pass filter adopts Ceramic Dielectric Filter part or SAW (Surface Acoustic Wave) device, and the frequency response bandwidth is 1550 to 1580MHz; Or adopt staggered tuning bandpass filter, wherein f
01Be the 1561.098MHz in " two generations of the Big Dipper ", f
021575.42MHz for GPS and Galileo.
4. big dipper multi-mode time service receiving device according to claim 1, it is characterized in that: described broadband time-service active antenna basic mechanical design feature index is:
(1) frequency range [MHz]: 1550-1580
(2) gain [dBi]:＞20
(3) noise figure [dB]:＜2.5@+25 ℃,＜3.0@+80 ℃
(4) Out-of-band rejection [dB]: fo=1570MHz
fo±30MHz ＞5
fo±50MHz ＞20
fo±100MHz ＞50
(5) input and output voltage standing-wave ratio (SWR) :≤2.0
(6) Anti-surging (impact) immunity to interference performance meets
GB/T17626.5-1999 idt IEC 61000-4-5:1995 standard
Surge waveform: CWG composite wave, 1.2/50 μ s, 8/20 μ s
Voltage peak [V]: 〉=2000
Number of pulses: 10
(7) signal time delay is less than 5ns.
According to claim 1 described multi-mode radio frequency receiver module by multimode narrow band filter, frequency mixer; Shared frequency comprehensive generator, intermediate frequency integrated filter, AGC automatic gain amplifier, A/D analog to digital converter and an access control processor, network interface; Multimode signal selector switch, signal level detecter, intermediate-frequency filter able to programme, digital demodulator form, it is characterized in that: adopt the method for integrated circuit to be produced on one or two chip, wherein, frequency mixer, comprehensive frequency generator, intermediate frequency integrated filter, AGC automatic gain amplifier, A/D analog to digital converter are integrated on the chip, and access control processor is integrated on another chip; Or all be integrated on the chip; Or frequency mixer, comprehensive frequency generator be integrated on the chip, intermediate frequency integrated filter, AGC automatic gain amplifier, A/D analog to digital converter, access control processor are integrated on another chip; Or employing software engineering demodulation, frequency mixer, comprehensive frequency generator, multimode signal selector switch, signal level detecter, LNA wideband low noise amplifier, A/D analog to digital converter are integrated on the chip, and intermediate-frequency filter able to programme, digital demodulator, access control processor etc. are integrated on another chip; The multi-mode radio frequency receiver module is installed and is mounted on one and prints in the copper-clad plate.
6. according to claim 1,5 described multi-mode radio frequency receiver modules, it is characterized in that: described multimode narrow band filter adopts Ceramic Dielectric Filter part or SAW (Surface Acoustic Wave) device, and the intermediate-frequency bandwidth of GPS is 2.046MHz; The intermediate-frequency bandwidth of two generations of the Big Dipper and Galileo is 4.092MHz.
7. according to claim 1,5 described multi-mode radio frequency receiver modules, it is characterized in that: described intermediate frequency integrated filter is for can write intermediate-frequency filter; Or adopting the discrete device settings such as Ceramic Dielectric Filter or surface acoustic wave, its centre frequency depends on the selection of local frequency, is arranged on 1 to 30MHz.
8. according to claim 1,5 described big dipper multi-mode time service receiving devices, it is characterized in that: described broadband time-service active antenna receives simultaneously from 6PS, Galileo and " two generations of the Big Dipper " satellite time transfer carrier signal, behind low noise amplification and broadband filter, via lightning arrester, concentric cable transfers to the multi-mode radio frequency receiver module, broadband high-frequency signals is respectively through two narrow band filter filtering, produce centre frequency and be respectively 1561.098MHz and 1575.42MHz, the frequency response bandwidth is two groups of high frequency analog signals of 4.092MHz, then enter respectively frequency mixer separately, carry out the down coversion mixing with the local frequency that comprehensive frequency generator produces, produce two centre frequency differences through mixing, the analog intermediate frequency signal that bandwidth is identical, because the bandwidth of GPS time signal is 2.046MHz, Galileo is 4.092MHz, therefore the wherein one group of intermediate-freuqncy signal after down coversion is comprising GPS and two groups of satellite time transfer information of Galileo simultaneously, another group then is the Big Dipper two generations intermediate-freuqncy signal, bandwidth is 4.092MHz, two groups of intermediate-freuqncy signals enter simultaneously and can write the intermediate frequency integrated filter, can write the intermediate frequency integrated filter under the control of access control processor, automatically giving tacit consent to one of them satellite time transfer intermediate-freuqncy signal according to centre frequency and band bandwidth is main signal, other is space signal, perhaps while cut-in stand-by signal oscillator; Enter the AGC automatic gain amplifier through filtered intermediate-freuqncy signal, then entering A/D analog-digital demodulation device finishes analog to digital conversion and conciliates spread spectrum and resolve, digit time signal after access control processor will resolve according to and the base station time synchronism machine between communication protocol and technical manual transmission time synchronizing signal, guarantee that mobile communication system is synchronized with a reference time.
9. according to claim 1,5 described big dipper multi-mode time service receiving devices, it is characterized in that: a multimode signal selector switch was set before frequency mixer, the major function of this selector switch is that the high-frequency signal incoming level to input multi-mode radio frequency receiver module detects and compare, and signal is strong to select, pulse code distorts smaller is as the time service main signal; The multimode signal selector switch is responsible for monitoring by the signal level detecter that independently arranges or be arranged in the access control processor, corresponding is that intermediate-frequency filter able to programme is made corresponding IF spot and frequency band change action according to the steering order of signal level detecter or access control processor simultaneously, LNA wideband low noise amplifier, A/D digital to analog converter are arranged on after the frequency mixer, to guarantee the required digital intermediate frequency signal of intermediate-frequency filter able to programme and gain amplifier.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439721A (en) * | 2013-08-14 | 2013-12-11 | 东莞市科维电子科技有限公司 | Beidou and GPS satellite dual-mode navigation system and navigation method thereof |
| CN104113371A (en) * | 2014-07-23 | 2014-10-22 | 成都天奥信息科技有限公司 | Transmit type satellite monitoring simulating device and working and application method |
| CN104748623A (en) * | 2015-03-24 | 2015-07-01 | 芜湖航飞科技股份有限公司 | Anti-interference system of navigation and positioning GPS guided weapon |
| CN109257057A (en) * | 2018-11-08 | 2019-01-22 | 扬州海科电子科技有限公司 | A kind of ultra wide band Superheterodyne receiving system |
| CN110927754A (en) * | 2019-11-15 | 2020-03-27 | 北京遥测技术研究所 | Low-orbit high-reliability micro-nano satellite navigation receiver |
-
2012
- 2012-06-14 CN CN 201210195132 patent/CN102928855A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439721A (en) * | 2013-08-14 | 2013-12-11 | 东莞市科维电子科技有限公司 | Beidou and GPS satellite dual-mode navigation system and navigation method thereof |
| CN104113371A (en) * | 2014-07-23 | 2014-10-22 | 成都天奥信息科技有限公司 | Transmit type satellite monitoring simulating device and working and application method |
| CN104748623A (en) * | 2015-03-24 | 2015-07-01 | 芜湖航飞科技股份有限公司 | Anti-interference system of navigation and positioning GPS guided weapon |
| CN109257057A (en) * | 2018-11-08 | 2019-01-22 | 扬州海科电子科技有限公司 | A kind of ultra wide band Superheterodyne receiving system |
| CN109257057B (en) * | 2018-11-08 | 2023-09-29 | 扬州海科电子科技有限公司 | Ultra-wideband superheterodyne receiving system |
| CN110927754A (en) * | 2019-11-15 | 2020-03-27 | 北京遥测技术研究所 | Low-orbit high-reliability micro-nano satellite navigation receiver |
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Application publication date: 20130213 |