CN101800363A - Integrated double-mode time-service active antenna and double-mode analog-digital demodulation module - Google Patents
Integrated double-mode time-service active antenna and double-mode analog-digital demodulation module Download PDFInfo
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Abstract
The invention provides an integrated double-mode time-service active antenna and a double-mode analog-digital demodulation module, which comprise a double-mode ceramic medium receiving antenna, a broadband low noise amplifier, a double-mode radio-frequency receiver module, the double-mode analog-digital demodulation module, a double-frequency change-over switch and the like, and is characterized in that: the ceramic medium antenna has double-mode broadband design, and the radio-frequency receiver is decomposed into two parts, namely a mixer unit and an analog-digital demodulation module which are both in a double-mode receiving-demodulating mode. Time service signals can be transmitted to a time substrate in a base station in a high-frequency broadband, network data, dual intermediate frequency or single intermediate frequency mode. A double-mode time-service frequency range can be the combination of signals of GPS and Beidou second-generation satellite or the combination of time service signals of other different navigation satellites. The invention realizes the function of simultaneously receiving and demodulating the clock signals of GPS and the Beidou second-generation satellite through optimized design, and improves the time service reliability and flexibility of the base station.
Description
Technical field
The time-service active antenna that the present invention relates to use in mobile radio communications system, the integrated bimodulus receive mode that is adopted can realize high-gain, anti-interference and compatible reception requirement, belongs to moving communicating field.
Background technology
In main mobile communication system such as systems such as CDMA, TD-SCDMA, its general satellite time service synchronizer is made of jointly the radio-frequency transmitter demodulation module that is arranged on the time-service active antenna on the exterior aerial pylon and be arranged in the base station.The radiofrequency signal that time-service active antenna will receive and amplify is transferred to the radio-frequency transmitter demodulation module that is arranged in the base station by radio frequency cable.Because time-service active antenna generally all is arranged on the antenna pylon, the transmission of high-frequency signal need so just must cause the decay to radiofrequency signal through long transmission cable.For avoiding the decay of radiofrequency signal in transmission course, just need in transmission cable, increase relay amplifier, thereby increase the system equipment manufacturing cost.Through looking into, the integrated single mode time-service active antenna that manufacturer production such as Trimble, Symmetricom, Motorala and Japanese Gu Ye are abroad arranged at present, time service reception antenna and radio-frequency transmitter modular design on one or two circuit boards, are received single GPS navigation satellite-signal.This scheme is actual to be that radio-frequency transmitter module on the time substrate that will be arranged in the base station moves in the time-service active antenna, constituted incorporate time-service active antenna, digital signal through demodulation changes the time substrate that directly is transferred to the base station by the network digital transmission cable again, has so just reduced because of transmitting high-frequency signal and the long decay that causes of distance.But this integrated technique only is applicable to gps satellite single mode time dissemination system.
In addition since the international satellite navigation system to be not limited to GPS of USA a kind of, in " two generations of the Big Dipper " that the GULILEO of other GPS (Global Position System) such as European Union, Muscovite GLONASS and China will soon set up, are the global location navigation system (COMPASS-M1), all incite somebody to action or entered practical stage, the satellite positioning navigation receiver or the time service service of a new generation, compatibility receives the signal of these systems simultaneously, for the user provides stable more, reliable, accurate service, it is inevitable that multisystem compatible receiver replaces the triangular web receiver to become.For guaranteeing that existing device for mobile communication can realize stable the switching in different regions and different satellite time service service, just require base station system must receive two or more satellite time signals simultaneously.For adapting to this requirement, the radio frequency chip manufacturer has produced and has been used for bimodulus radio demodulating chip and functional module the satellite navigation location and energy compatible with GPS and GLONASS, but, cause the function of bimodulus radio demodulating chip and functional module to be fully used owing to lack the double-mode time service active antenna that can be its service.And in the disclosed patent that can serve two kinds of satellite time services service of China, also be to propose at " No. one, the Big Dipper " and gps satellite, because " No. one, the Big Dipper " time service frequency range is arranged on 2491.75MHz, bigger apart with the L1 time service frequency range of GPS, therefore the time-service active antenna of two different receive frequencies must be set respectively before receiver, seek star in the azimuth accurately because of " No. one, the Big Dipper " time service again, the therefore integrated bimodulus time service service of technical very difficult realization.
Be about to the technical specification of " two generations of the Big Dipper " satellite navigation system of foundation at China, the applicant had before applied for " a kind of double-mode time service active antenna " patent, experimental results show that the satellite time signal that can receive GPS and " two generations of the Big Dipper " two frequency ranges fully simultaneously.As further optimal design again, use for reference integrated design technology, existing Receiver Module is improved, can overcome the defective that current integrated time-service active antenna exists, also can compatible different satellite time dissemination systems, improve the reliability and the flexibility of base station time service, further reduced the device fabrication cost.
Summary of the invention
Problem to be solved by this invention provides and a kind ofly can receive two kinds of satellite time services service and brand-new integrated double-mode time service active antenna and the bimodulus analog-digital demodulation module supporting with it simultaneously.
Integrated double-mode time service active antenna of the present invention and bimodulus analog-digital demodulation module are respectively by bimodulus ceramic dielectric reception antenna, low noise amplifier unit; Bimodulus radio-frequency transmitter module; Mixer unit, intermediate-frequency filter, impedance matching box; Bimodulus analog-digital demodulation module, double frequency diverter switch; Anti-lightning strike surge impact circuit, the voltage stabilizing circuit of powering, the two-sided printing copper-clad plate that contains microstrip circuit, N type needle electric coupler, antenna casing are formed, and it is characterized in that: broadband ceramic medium antenna, low noise amplifier unit; Bimodulus radio-frequency transmitter module; Mixer unit, intermediate-frequency filter, impedance matching box; The bimodulus analog-digital demodulation module; Anti-lightning strike surge impact circuit, power supply voltage stabilizing circuit; The double frequency diverter switch; N type needle electric coupler connects successively by little band connecting line or the radio frequency cable on the double-sided copper-clad printed circuit board, forms integrated double-mode time service active antenna circuit module; The time service dagital clock signal is by the time substrate in the network cable connection base station; Bimodulus high-frequency signal, dual IF or single intermediate-freuqncy signal are by the time substrate in the coaxial radio frequency cable connection base station; The N type radio-frequency (RF) output end of needle electric coupler or network digital interface or double frequency diverter switch are installed on the housing preformed hole; The bimodulus time service receives the combination of the B1 frequency range satellite-signal in L1 that frequency range is GPS and two generations of the Big Dipper.
Described low noise amplifier unit is made up of preposition band pass filter, low noise amplifier, broadband band-pass filter, one chip amplifier, narrow band filter.
Described ceramic medium antenna is the dual mode wideband reception antenna, can accept GPS and " two generations of the Big Dipper " satellite time service carrier signal simultaneously, be primarily characterized in that: 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; This ceramic medium antenna is arranged at the one side of copper-clad plate, and is connected to low noise amplifier unit input by lead-in wire.
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, and its frequency response bandwidth can cover the B1 frequency range in two generations of L1, the Big Dipper of GPS; Or the staggered tuning band pass filter of employing double frequency LC, wherein f
01Be the 1561.098MHz in " two generations of the Big Dipper ", f
021575.42MHz for GPS.
Described mixer unit comprises narrow band filter, frequency mixer, comprehensive frequency generator, intermediate-frequency filter, double frequency diverter switch, impedance matching box, principal character is: two narrow band filters and two frequency mixers are set respectively, a comprehensive frequency generator, two intermediate-frequency filters, an or double frequency diverter switch, or impedance matching box.Enter separately frequency mixer respectively through the radiofrequency signal of narrow band filter output, comprehensive frequency generator produces a local frequency, produces different separately IF-FRE through the frequency mixer frequency conversion and enters shared impedance matching box; The double frequency diverter switch receives from the control command of analog-digital demodulation module and finishes the bimodulus switching.Described double frequency diverter switch can independently be arranged on the housing or be integrated in the mixer unit; Or be mounted on the flange end that is installed in N type needle electric coupler on the copper clad plate.
Described narrow band filter is provided with two, adopts Ceramic Dielectric Filter part or SAW (Surface Acoustic Wave) device, and the frequency response bandwidth is respectively, and the centre frequency that is used for GPS is 1575.42MHz, and bandwidth is 2.046MHz; The centre frequency of the Big Dipper two generations B1 frequency range is 1561.098MHz, and bandwidth is 4.092MHz.
Described intermediate-frequency filter is provided with two, and its centre frequency depends on the selection of local frequency, is arranged on 1 to 30MHc; The intermediate-frequency bandwidth of GPS is 2.046MHz; The intermediate-frequency bandwidth in two generations of the Big Dipper is 4.092MHz.
Above-mentioned low noise amplifier unit and mixer unit and narrow band filter, impedance matching box, double frequency diverter switch are used the metallic shield shielding, wherein preposition band pass filter, low noise amplifier are arranged in the metallic enclosure, broadband band-pass filter, one chip amplifier and anti-lightning strike surge impact circuit and power supply voltage stabilizing circuit are arranged in the metallic enclosure, and mixer unit and narrow band filter, impedance matching box are arranged in another metallic enclosure; The double frequency diverter switch of setting up separately is individually shielded.
Described antenna casing is made up of cap and housing, and double-mode time service active antenna circuit module or bimodulus radio-frequency transmitter module or mixer unit aggregate erection are in antenna housing; Described double frequency diverter switch can independently be provided with or be integrated in the mixer unit; N type needle electric coupler, or network digital interface or double frequency diverter switch be installed on the housing, and cap and housing seal are fastening, obtain complete integrated bimodulus time service Active Receiving Antenna; Antenna housing adopts ASA plastics or anti-ultraviolet engineering plastics such as ABS, Merlon to make.
Above-mentioned bimodulus radio-frequency transmitter module by binary channels narrow band filter, frequency mixer, comprehensive generator of shared frequency, serve the intermediate frequency dielectric filter or the Surface Acoustic Wave Filter in GPS and two generations of the Big Dipper or integrated filter; Low noise intermediate frequency amplifier and the control of AGC automatic gain, A/D analog to digital converter and an access control processor are formed, it is characterized in that: described bimodulus radio-frequency transmitter module adopts the method for integrated circuit to be produced on one or two chip, wherein, frequency mixer, the comprehensive generator of shared frequency, intermediate-frequency filter, low noise intermediate frequency amplifier and the control of AGC automatic gain, an A/D analog to digital converter are integrated on the chip, and access control processor is integrated on another chip; GPS intermediate-frequency filter and the Big Dipper two generations intermediate-frequency filter adopt intermediate frequency Ceramic Dielectric Filter or Surface Acoustic Wave Filter independently to be provided with, or adopt integrated filter to be produced within the chip; Bimodulus radio-frequency transmitter module is installed and is mounted on one and covers on the copper printed circuit board, or is installed in the double-mode time service active antenna, or on the time substrate of aggregate erection in the base station;
Described bimodulus analog-digital demodulation module is the improvement to GPS radio-frequency transmitter module, be to be mixer unit and bimodulus analog-digital demodulation module two parts with the radio-frequency transmitter decomposition module, mixer unit is arranged in the time-service active antenna, and the bimodulus analog-digital demodulation module is arranged on the time substrate in the base station.The bimodulus analog-digital demodulation module is by the intermediate frequency dielectric filter or the Surface Acoustic Wave Filter of serving GPS and the Big Dipper two generations frequency range, or integrated filter; Binary channels low noise intermediate frequency amplifier, automatic gain control circuit, A/D analog to digital converter and an access control processor are formed, and this module adopts the method for integrated circuit to make, and are installed in one and cover on the copper printed circuit board.
The present invention can select following technical scheme to realize:
First kind is dual mode data line transmission plan:
This scheme is that bimodulus radio-frequency transmitter module is moved in the antenna casing, forms complete antenna module, by data cable transmission of digital clock signal.Behind preposition band pass filter, deliver to low noise amplifier by the satellite time signal that the broadband ceramic medium antenna receives, send into the broadband filter that can cover two radiofrequency signals through the radiofrequency signal that low noise amplifier amplifies, guarantee that sideband suppresses and signal to noise ratio, its range of frequency bandwidths is at 1550MHz to 1680MHz, radiofrequency signal is amplified through the low noise one chip amplifier, guarantee that its gain is greater than more than 20 decibels, enter narrow band filter separately then, wherein the GPS centre frequency is 1575.42MHz, and bandwidth is 2.046MHz; The centre frequency of the Big Dipper two generations B1 frequency range is 1561.098MHz, and bandwidth is 4.092MHz.Bimodulus radio-frequency transmitter module is moved in the time-service active antenna by the base station, and radiofrequency signal enters bimodulus radio-frequency transmitter module frequency mixer separately respectively, and the local frequency mixing that produces with shared comprehensive frequency generator produces separately intermediate-freuqncy signal through down-conversion.Analog intermediate frequency signal is again through intermediate-frequency filter filtering, finish low noise amplification and the control of AGC automatic gain at intermediate frequency amplifier separately, sample, separate spread spectrum and coding by A/D analog to digital converter separately then, access control processor resolves and controls according to the dagital clock signal quality and by software to be judged automatically and accepts or rejects time signal, to guarantee accuracy, fail safe and the reliability of communication time dissemination system, the dagital clock signal after the demodulation is by the time substrate in the network data cable connection base station.Its key problem in technology is that warm frequency conversion moves, the strong magnetic disturbance of preventing RF and anti-lightning strike safety guarantee.
Second kind is bimodulus high-frequency transmission scheme:
This scheme requires radio-frequency transmitter module to have the bimodulus or the multimode demodulation function in GPS and two generations of the Big Dipper.Behind preposition band pass filter, deliver to low noise amplifier by the satellite time signal that the broadband ceramic medium antenna receives, send into the broadband filter that can cover two radiofrequency signals through the radiofrequency signal that low noise amplifier amplifies, guarantee that sideband suppresses and signal to noise ratio, its range of frequency bandwidths is at 1550MHz to 1580MHz, radiofrequency signal is amplified through the low noise one chip amplifier again, guarantee its gain greater than more than 20 decibels, the bimodulus radiofrequency signal sends the bimodulus radio-frequency transmitter module that is installed in the base station to via transmission cable, lightning arrester.This module routine is: enter in the radio-frequency transmitter module separately narrow band filter respectively from the compound radio-frequency signal of time-service active antenna, enter separately frequency mixer and the local frequency frequency conversion that produces of comprehensive frequency generator then, produce intermediate-freuqncy signal separately, analog intermediate frequency signal amplifies and the control of AGC automatic gain through at first finish low noise behind the intermediate frequency filtering in intermediate frequency amplifier separately, sample by A/D analog to digital converter separately then, separate spread spectrum and coding, the digital dock machine sign indicating number that demodulates send the time substrate, access control processor is realized resolving and controlling according to the quality of two groups of dagital clock signals and by software, and to judging automatically from the time signal of double star and accepting or rejecting, to guarantee the accuracy of communication time dissemination system, fail safe and reliability.
The third is a bimodulus dual IF transmission plan:
The radio-frequency transmitter module is divided into mixer unit and two parts of bimodulus analog-digital demodulation module, and mixer unit is installed in the time-service active antenna, and the bimodulus analog-digital demodulation module is installed on the time substrate in the base station.Its course of work is: radiofrequency signal enters frequency mixer separately respectively behind narrow-band filtering in the time service antenna, and the local frequency mixing with comprehensive frequency generator produces produces intermediate-freuqncy signal separately, and wherein the GPS bandwidth is 2.046MHz; The Big Dipper two generations bandwidth is 4.092MHz.After intermediate frequency filtering and impedance matching, transfer to bimodulus analog-digital demodulation module in the base station by radio frequency cable, lightning arrester.This transmission means is actual to be the dual IF transmission, and the key of its technology realization is that warm frequency conversion moves and control mutual interference.
The bimodulus analog-digital demodulation module is to integrate or the demodulation module of two autonomous channels, analog intermediate frequency signal is at first finished intermediate frequency filtering in intermediate frequency amplifier separately, low noise amplifies and the control of AGC automatic gain, samples, separates spread spectrum and coding by A/D analog to digital converter separately then.Access control processor resolves and controls by software to be judged automatically and accepts or rejects the double star time signal.
The 4th kind is bimodulus list intermediate frequency transmission plan:
In integrated bimodulus time service antenna, a double frequency diverter switch is set.Behind preposition band pass filter, deliver to low noise amplifier by the satellite time signal that ceramic medium antenna receives, send into broadband filter through the radiofrequency signal that low noise amplifier amplifies, be amplified into separately narrow band filter through the low noise one chip amplifier again, two radiofrequency signals enter frequency mixer separately respectively, local frequency mixing with the comprehensive frequency generator generation, produce intermediate-freuqncy signal separately, after intermediate frequency filtering and double frequency diverter switch, transfer to bimodulus analog-digital demodulation module in the base station by radio frequency cable.
Bimodulus analog-to-digital conversion demodulation module is the demodulation module that integrates, analog intermediate frequency signal at first enters integrated filter or ceramic dielectric intermediate-frequency filter separately, or surface acoustic wave intermediate-frequency filter, the intermediate frequency low noise amplifies and the AGC automatic gain is controlled the amplification of finishing intermediate-freuqncy signal, sample and coding by A/D analog to digital converter separately then, send time figure base band template through the digital signal of demodulation.Access control processor is according to the gain height and the frame hopping rate output control command of digital signal, this instruction is uploaded to double frequency diverter switch on the integrated double-mode time service active antenna by transmission cable, selects one of them intermediate-freuqncy signal to send the bimodulus analog-digital demodulation module again to.
Special feature of the present invention is: adopt a broadband Active Receiving Antenna can receive GPS and " two generations of the Big Dipper " satellite time service carrier signal simultaneously, bimodulus radio-frequency transmitter module can be arranged in the time-service active antenna, or to decompose bimodulus radio-frequency transmitter module be mixing unit and bimodulus analog-digital demodulation module two parts, is separately positioned on the time substrate in time-service active antenna or the base station.After mixer unit moves to time-service active antenna, can adopt intermediate frequency technical transmission means, just the radiofrequency signal of two different frequencies contains the intermediate-freuqncy signal of two different frequencies and bandwidth simultaneously to base station transmits after having finished high frequency amplification, mixing, finishes bimodulus by the access control processor in the bimodulus analog-digital demodulation module and switches; Or adopt single intermediate frequency transmission, and can be by the output of the access control processor on bimodulus analog-digital demodulation module control command, the electronics double frequency diverter switch that is uploaded on the integrated bimodulus time service antenna is switched, and transmits single intermediate-freuqncy signal; Because the intermediate-freuqncy signal frequency is low, intermodulation distortion is little, has therefore improved fail safe, reliability and the flexibility of base station time service, has reduced equipment cost simultaneously.This invention has stronger flexibility, can select the multiple technologies mode to transmit and demodulation double star time signal.
Description of drawings:
Fig. 1 is the integrated double-mode time service active antenna schematic diagram of the present invention
Fig. 2 is the integrated bimodulus time service of a present invention grid line transmission schematic diagram
Fig. 3 is the integrated dual IF transmission of a present invention schematic diagram
Fig. 4 is the integrated single intermediate frequency transmission schematic diagram of the present invention
Fig. 5 is the integrated single intermediate frequency transmission general structure schematic diagram of the present invention
Fig. 6 is an integrated network line transmission general structure schematic diagram of the present invention
Wherein: 1 dual mode wideband ceramic medium antenna; 2 preposition band pass filters; 3 low noise amplifiers; 4 broadband band-pass filters; 5 one chip amplifiers; 6 anti-lightning strike surge impact circuit; 7 power supply voltage stabilizing circuits; 8 radio frequency cables; 9 radomes; 10 caps; 11 housings; 12 double face copper; 13 bimodulus radio-frequency transmitter modules; 14 frequency mixers; 15 comprehensive frequency generators; 16 double frequency diverter switches; 17 access control processors; 18 intermediate-frequency filters; 19 intermediate frequency amplifiers and automatic gain control; 20 A/D analog to digital converters; 21 narrow band filters; 22 impedance matching boxs; 23 bimodulus analog-digital demodulation modules; 24 network data line interfaces; 25 low noise amplifier unit; 26 data cable
Embodiment
Embodiment one:
This scheme is that bimodulus radio-frequency transmitter module 13 is moved in the antenna casing, forms complete antenna module, by data cable 26 transmission of digital clock signals.Behind preposition band pass filter 2, deliver to low noise amplifier 3 by the satellite time signal that broadband ceramic medium antenna 1 receives, send into the broadband filter 4 that can cover two radiofrequency signals through the radiofrequency signal that low noise amplifier 3 amplifies, guarantee that sideband suppresses and signal to noise ratio, its range of frequency bandwidths is at 1550MHz to 1580MHz, radiofrequency signal is amplified through low noise one chip amplifier 5 again, guarantee that its gain is greater than more than 20 decibels, enter narrow band filter 21 separately then, wherein the GPS centre frequency is 1575.42MHz, and bandwidth is 2.046MHz; The centre frequency of the Big Dipper two generations B1 frequency range is 1561.098MHz, and bandwidth is 4.092MHz.Bimodulus radio-frequency transmitter module 13 is by moving in the base station in the time service antenna, radiofrequency signal enters bimodulus radio-frequency transmitter module 13 frequency mixer 14 separately respectively, the local frequency mixing that produces with shared comprehensive frequency generator 15, through down-conversion generation intermediate-freuqncy signal separately, send into bimodulus analog-digital demodulation module 23 through intermediate-frequency filter 19.Analog intermediate frequency signal is at first finished low noise amplification and the control of AGC automatic gain at intermediate frequency amplifier 19 separately, sample, separate spread spectrum and coding by A/D analog to digital converter separately then, access control processor 17 according to digital signal quality and by software control to judging automatically from the time signal of double star and accepting or rejecting, guaranteeing accuracy, fail safe and the reliability of communication time dissemination system, the digital signal after the demodulation is connected time substrate in the base station by network data interface 24 with data cable 26.Operation principle as shown in Figure 1, circuit module is as shown in Figure 2.
Embodiment two:
This scheme requires radio-frequency transmitter module to have the bimodulus or the multimode demodulation function in GPS and two generations of the Big Dipper.Behind preposition band pass filter 2, deliver to low noise amplifier 3 by the satellite time signal that bimodulus ceramic medium antenna 1 receives, send into broadband filter 4 through the radiofrequency signal that low noise amplifier 3 amplifies, guarantee that sideband suppresses and signal to noise ratio, the radiofrequency signal that covers the double star signal is amplified through low noise one chip amplifier 5 again, guarantee its gain greater than more than 20 decibels, the High Frequency Of Recombination radiofrequency signal sends the bimodulus radio-frequency transmitter module 13 that is arranged in the base station to via radio frequency cable 8, lightning arrester.The bimodulus radiofrequency signal enters narrow band filter 21 separately respectively, and wherein the GPS centre frequency is 1575.42MHz, and bandwidth is 2.046MHz; The centre frequency of the Big Dipper two generations B1 frequency range is 1561.098MHz, and bandwidth is 4.092MHz.The local frequency frequency conversion that produces at separately frequency mixer 14 and comprehensive frequency generator 15 then, produce intermediate-freuqncy signal separately, analog intermediate frequency signal amplifies and the control of AGC automatic gain through finish low noise after intermediate-frequency filter 18 filtering in intermediate frequency amplifier 19 separately, sample, separate spread spectrum and coding by A/D analog to digital converter separately then, access control processor 17 resolves and controls according to the quality of dagital clock signal and by software to be judged automatically and accepts or rejects the double star time signal, to guarantee accuracy, fail safe and the reliability of communication time dissemination system.Time substrate in the dagital clock signal link base station after the demodulation.
Embodiment three:
Radio-frequency transmitter module 13 is divided into mixer unit and 23 two parts of bimodulus analog-digital demodulation module, and mixer unit is installed in the time-service active antenna, and bimodulus analog-digital demodulation module 23 is installed on the time substrate in the base station.Behind preposition band pass filter 2, deliver to low noise amplifier 3 by the satellite time signal that broadband ceramic medium antenna 1 receives, send into broadband filter 4 through the radiofrequency signal that low noise amplifier 3 amplifies, guarantee that sideband suppresses and signal to noise ratio, the radiofrequency signal that covers the double star signal is amplified through low noise one chip amplifier 5 again, guarantee that its gain is greater than more than 20 decibels, enter narrow band filter 21 separately then, two radiofrequency signals enter frequency mixer 14 separately respectively, local frequency mixing with comprehensive frequency generator 15 generations, produce intermediate-freuqncy signal separately, behind intermediate-frequency filter 18 and impedance matching box 22, pass through radio frequency cable 8, lightning arrester transfers to the bimodulus analog-digital demodulation module 23 in the base station, finishes the dual IF transmission.
Bimodulus analog-digital demodulation module 23 for integrate or two demodulation modules independently, analog intermediate frequency signal is at first finished low noise amplification and the control of AGC automatic gain in intermediate frequency amplifier 19 separately, sampled, separated spread spectrum and coding by A/D analog to digital converter separately then, the digital dock machine sign indicating number that demodulates send the time substrate.Access control processor 17 is judged automatically the double star time signal and is accepted or rejected according to the dagital clock signal quality and by software control.As shown in Figure 3.
Embodiment four:
In integrated bimodulus time service antenna, a double frequency diverter switch 16 is set.Behind preposition band pass filter 2, deliver to low noise amplifier 3 by the satellite time signal that broadband ceramic medium antenna 1 receives, send into broadband filter 4 through the radiofrequency signal that low noise amplifier 3 amplifies, be amplified into separately narrow band filter 21 through low noise one chip amplifier 5, two radiofrequency signals enter frequency mixer 14 separately respectively, local frequency mixing with comprehensive frequency generator 15 generations, produce intermediate-freuqncy signal separately, after intermediate-frequency filter 18 and double frequency diverter switch 16, transfer to the bimodulus analog-digital demodulation module 23 that is arranged in the base station by radio frequency cable 8.As shown in Figure 4.
Analog intermediate frequency signal at first enters the intermediate-frequency filter 18 in the bimodulus analog-digital demodulation module 23, the amplification to intermediate-freuqncy signal is finished in intermediate frequency amplifier 19 and the control of AGC automatic gain, then by sampling of separately A/D analog to digital converter and coding, send the time substrate through the dagital clock signal of demodulation.Access control processor 17 is according to the gain height and the frame hopping rate output control command of dagital clock signal, this instruction is uploaded to double frequency diverter switch 16 on the integrated double-mode time service active antenna by radio frequency cable 8, selects one of them intermediate-freuqncy signal to send bimodulus analog-digital demodulation module 23 to through radio frequency cable 8 again.Double frequency diverter switch 16 can be arranged on the housing, or in the integrated circuit of design in mixer unit; Or be mounted on the flange end that is installed in N type needle electric coupler on the copper clad plate.
Integrated double-mode time service active antenna is provided with radome 9 respectively between each circuit module, anti-lightning strike surge impact circuit 6, power supply voltage stabilizing circuit 7 guarantee the impact of power supply and anti-lightning strike surge breakdown voltage; N type needle electric coupler or network data interface 24, or the double frequency diverter switch of setting up separately 16 is installed on the antenna housing 11, and cap 10 and housing 11 sealings are fastening.Shown in Fig. 5,6.
Claims (9)
1. integrated double-mode time service active antenna and bimodulus analog-digital demodulation module are respectively by broadband ceramic dielectric reception antenna, low noise amplifier unit; Bimodulus radio-frequency transmitter module; Mixer unit, intermediate-frequency filter, impedance matching box; Bimodulus analog-digital demodulation module, double frequency diverter switch; Anti-lightning strike surge impact circuit, the voltage stabilizing circuit of powering, the two-sided printing copper-clad plate that contains microstrip circuit, N type needle electric coupler, antenna casing are formed, and it is characterized in that: broadband ceramic medium antenna, low noise amplifier unit; Bimodulus radio-frequency transmitter module; Mixer unit, intermediate-frequency filter, impedance matching box; The bimodulus analog-digital demodulation module; Anti-lightning strike surge impact circuit, power supply voltage stabilizing circuit; The double frequency diverter switch; N type needle electric coupler connects successively by little band connecting line or the radio frequency cable on the double-sided copper-clad printed circuit board, forms integrated double-mode time service active antenna circuit module; Bimodulus time service dagital clock signal is by the time substrate in the network cable connection base station; Bimodulus high-frequency signal, dual IF or single intermediate-freuqncy signal are by the time substrate in the coaxial radio frequency cable connection base station; The N type radio-frequency (RF) output end of needle electric coupler or network digital interface or double frequency diverter switch are installed on the housing preformed hole; The bimodulus time service receives the combination of the B1 frequency range satellite-signal in L1 that frequency range is GPS and two generations of the Big Dipper;
Above-mentioned bimodulus radio-frequency transmitter module is by binary channels narrow band filter, frequency mixer, comprehensive generator of shared frequency, intermediate-frequency filter; Low noise intermediate frequency amplifier and the control of AGC automatic gain, A/D analog to digital converter and an access control processor are formed, it is characterized in that: described bimodulus radio-frequency transmitter module adopts the method for integrated circuit to be produced on one or two chip, wherein, frequency mixer, the comprehensive generator of shared frequency, intermediate-frequency filter, low noise intermediate frequency amplifier and the control of AGC automatic gain, an A/D analog to digital converter are integrated on the chip, and access control processor is integrated on another chip; GPS intermediate-frequency filter and the Big Dipper two generations intermediate-frequency filter adopt Ceramic Dielectric Filter or Surface Acoustic Wave Filter independently to be provided with, or adopt integrated filter to be produced within the chip; Bimodulus radio-frequency transmitter module is installed and is mounted on one and covers on the copper printed circuit board, or is installed in the double-mode time service active antenna, or on the time substrate of aggregate erection in the base station;
Above-mentioned bimodulus analog-digital demodulation module is the fractionation to described bimodulus radio-frequency transmitter module, mainly the radio-frequency (RF) component such as mixer unit in the bimodulus radio-frequency transmitter module are arranged in the time-service active antenna, it is characterized in that: described bimodulus analog-digital demodulation module is made mode for the bimodulus binary channels, this module comprises GPS intermediate-frequency filter and " two generations of the Big Dipper " intermediate-frequency filter that adopts Ceramic Dielectric Filter or Surface Acoustic Wave Filter to make, or adopts integrated filter to be produced within the chip; Also comprise binary channels low noise intermediate frequency amplifier, AGC automatic gain control circuit, A/D analog to digital converter and an access control processor, all adopt the method for integrated circuit to be produced in one or two chip, and install and be mounted on one and cover on the copper printed circuit board, then on the time substrate of aggregate erection in the base station.
2. integrated time-service active antenna receiving system according to claim 1 and bimodulus analog-digital demodulation module is characterized in that: described low noise amplifier unit is made up of preposition band pass filter, low noise amplifier, broadband band-pass filter, one chip amplifier, narrow band filter.
3. integrated time-service active antenna receiving system according to claim 1 and bimodulus analog-digital demodulation module, it is characterized in that: described ceramic medium antenna is the dual mode wideband reception antenna, can accept GPS and " two generations of the Big Dipper " satellite time service carrier signal simultaneously, this ceramic medium antenna receive frequency is respectively the time service carrier signal of the 1575.42MHz of the 1561.098MHz in " two generations of the Big Dipper " and GPS; Or the combination of other satellite-signals etc.; This ceramic medium antenna is arranged at the one side of copper-clad plate, and is connected to low noise amplifier unit input by lead-in wire.
4. according to claim 1,2 described integrated time-service active antenna receiving system and bimodulus analog-digital demodulation modules, it is characterized in that: described broadband band-pass filter is a double frequency point filter, adopt Ceramic Dielectric Filter part or SAW (Surface Acoustic Wave) device, the frequency response bandwidth is 1550 to 1580MHz, or extending to 1650MHz, its frequency response bandwidth can cover the L1 of GPS and the B1 frequency range in two generations of the Big Dipper; Or the staggered tuning band pass filter of employing double frequency LC, wherein f
01Be the 1561.098MHz in " two generations of the Big Dipper ", f
021575.42MHz for GPS.
5. integrated time-service active antenna receiving system according to claim 1 and bimodulus analog-digital demodulation module, it is characterized in that: described mixer unit designs for binary channels, two narrow band filters and two frequency mixers are set respectively, a comprehensive frequency generator, two intermediate-frequency filters and double frequency diverter switch, impedance matching box; The double frequency diverter switch is switched by finish bimodulus from the control command of the bimodulus analog-digital demodulation module in the base station.
6. according to claim 1,5 described integrated time-service active antenna receiving system and bimodulus analog-digital demodulation modules, it is characterized in that: above-mentioned narrow band filter adopts Ceramic Dielectric Filter part or SAW (Surface Acoustic Wave) device, the frequency response bandwidth is respectively, the centre frequency that is used for GPS is 1575.42MHz, and bandwidth is 2.046MHz; The centre frequency of the Big Dipper two generations B1 frequency range is 1561.098MHz, and bandwidth is 4.092MHz.
7. according to claim 1,5 described integrated time-service active antenna receiving system and bimodulus analog-digital demodulation modules, it is characterized in that: above-mentioned intermediate-frequency filter is provided with two, adopts Ceramic Dielectric Filter part or SAW (Surface Acoustic Wave) device, or digital integrated filter; Its centre frequency depends on the setting of local frequency, and IF-FRE is arranged on 1 to 30MHz, and the intermediate-frequency bandwidth of GPS is 2.046MHz; The medium frequency bandwidth in two generations of the Big Dipper is 4.092MHz.
8. integrated time-service active antenna receiving system according to claim 1 and bimodulus analog-digital demodulation module, it is characterized in that: above-mentioned low noise amplifier unit and mixer unit and narrow band filter, impedance matching box uses the metallic shield shielding, wherein preposition band pass filter, low noise amplifier is arranged in the metallic enclosure, broadband band-pass filter, one chip amplifier and anti-lightning strike surge impact circuit and power supply voltage stabilizing circuit are arranged in the metallic enclosure mixer unit and narrow band filter, impedance matching box is arranged in another metallic enclosure; Independently the double frequency diverter switch is individually shielded; Bimodulus radio-frequency transmitter module individual screen.
9. integrated time-service active antenna receiving system according to claim 1 and bimodulus analog-digital demodulation module, it is characterized in that: described antenna casing is made up of cap and housing, and double-mode time service active antenna circuit module or bimodulus radio-frequency transmitter module or mixer unit aggregate erection are in antenna housing; Described double frequency diverter switch can independently be provided with, or is integrated in the mixer unit, or is mounted on the flange end that is installed in N type needle electric coupler on the copper clad plate; N type needle electric coupler, or network digital interface or double frequency diverter switch be installed on the housing, and cap and housing seal are fastening, obtain complete integrated bimodulus time service Active Receiving Antenna; Antenna housing adopts ASA plastics or anti-ultraviolet engineering plastics such as ABS, Merlon to make.
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| CN103487818A (en) * | 2013-09-25 | 2014-01-01 | 上海旦迪电子科技有限公司 | Beidou satellite navigation intelligent receiver |
| CN103513259A (en) * | 2013-09-21 | 2014-01-15 | 江西车仆电子智能科技有限公司 | Dual-mode positioning and timing system |
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| CN110164115A (en) * | 2019-06-05 | 2019-08-23 | 河南卓正电子科技有限公司 | A kind of multi-mode Internet of Things wisdom energy source data acquisition terminal |
| CN113447966A (en) * | 2021-08-19 | 2021-09-28 | 北京云恒科技研究院有限公司 | Protection method for navigation signal receiver |
| CN115309031A (en) * | 2022-07-22 | 2022-11-08 | 杭州亿邦博通科技股份有限公司 | Beidou/GPS dual-mode digital high-precision synchronous time service equipment and system |
| CN115309031B (en) * | 2022-07-22 | 2023-12-29 | 杭州亿邦博通科技股份有限公司 | Beidou/GPS dual-mode digital high-precision synchronous time service equipment and system |
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