CN101835004B - Frequency agility system for co-frequency forwarding of digital television - Google Patents
Frequency agility system for co-frequency forwarding of digital television Download PDFInfo
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- CN101835004B CN101835004B CN200910258090A CN200910258090A CN101835004B CN 101835004 B CN101835004 B CN 101835004B CN 200910258090 A CN200910258090 A CN 200910258090A CN 200910258090 A CN200910258090 A CN 200910258090A CN 101835004 B CN101835004 B CN 101835004B
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Abstract
The invention relates to a frequency agile system for co-frequency forwarding of a digital television, which mainly comprises a donor antenna, a frequency agile host machine, a digital television power amplifier and a retransmitting antenna, wherein the donor antenna for receiving a digital television signal derived from a main transmitting station is connected with the input end of the frequency agile host machine by a coaxial cable; the digital television power amplifier for power amplification is connected with the output end of the frequency agile host machine by a coaxial cable; and the retransmitting antenna for transmitting a digital television signal is connected with the output end of the digital television power amplifier by a coaxial cable. The invention has the advantage of being suitable for different frequency bands and different output power of the c-frequency forwarding of the digital television. The use performance is favorable, the quality of the digital television signal and the signal coverage of a blind area can be ensured, and the digital television signal is enabled to forwards extend continuously; and a working channel of the frequency agile system can be configured by software according to the requirement of practical engineering application without waiting and restarting and is speedy and convenient.
Description
Technical field
The present invention relates to the DTV transmitter, particularly a kind of DTV that is used for is with the frequency agile system of transmitting frequently.
Background technology
Under the situation that DTV is promoted day by day, in some markets, underground parking, tunnel, skyscraper, elevator, public place of entertainment and outskirts of a town and outlying zone,, will be unthinkable if there is not the covering of digital television signal.Characteristics in conjunction with digital TV transmitter; Can not cover poor zone or signal blind zone at each digital television signal and all set up a transmitting station; So all set up DTV with the frequency agility device of transmitting frequently usually in these zones, the native system device well solves these problems.Frequency agile system is to utilize directive antenna that digital television signal is introduced, and digital television signal is carried out filtering amplify, and is transmitted into the shadow region with directive antenna again.But because the isolation of input, output antenna is limited, for fear of the amplifier self-excitation, amplifying power can not be too big usually.Frequency agile system also can be used to the improvement of indoor reception; Because building is to attenuation of Electromagnetic; Indoor signal strength signal intensity is significantly less than the intensity of outdoor signal, and the major parameter of frequency agile system is gain, sensitivity, power output, signal to noise ratio, band shoulder, the modulation error rate and linearity.
Summary of the invention
The present invention will solve the defective of above-mentioned prior art, provides a kind of DTV that is used for the frequency agile system of frequently transmitting, this system can effectively solve digital TV transmitter can not the overlay area signal quality of digital television problem.
The present invention solves the technical scheme that its technical problem adopts.This DTV that is used for is with the frequency agile system of transmitting frequently; Mainly comprise donor antenna, frequency agility main frame, digital television power amplifier and retransmitting antenna, the donor antenna that wherein is used to receive the digital television signal of autonomous cell site is connected with frequency agility main frame input through coaxial wire; The frequency agility main frame is made up of small-signal processing unit, clock generation unit, CPU control unit, GSM MODEM unit, power conversion unit and power supply; Wherein small-signal processing unit and clock generation unit according to four signals one by one correspondence be connected, the CPU control unit is connected with small-signal processing unit, clock generation unit, GSM MODEM unit respectively.The digital television power amplifier that is used for power amplification is connected with the frequency agility host output end through coaxial wire; The retransmitting antenna that is used to launch digital television signal is connected with the digital television power amplifier output through coaxial wire.Described small-signal processing unit comprises low noise amplifier part, IF process part, output amplifier section and control section; Clock generation unit comprises local oscillation signal LO1 and LO4 generator, local oscillation signal LO2 and LO3 generator and control section; Donor antenna is sent into the low noise amplifier in the frequency agility main frame after receiving signal, and signal is amplified into numerical-control attenuator A, and A amplifies once more with signal amplifier; Get into numerical-control attenuator B once more signal level is controlled and regulated, the signal that comes out then arrives first order intermediate frequency through first frequency mixer with frequency translation then through signal amplifier B; After the decay with the first intermediate frequency amplifier compensating signal, first order intermediate frequency is carried out filtering, then carry out the mixing second time with first intermediate-frequency filter; Through obtaining second level intermediate frequency behind second frequency mixer, with the second intermediate frequency amplifier A signal attenuation is compensated, with second intermediate-frequency filter second level intermediate frequency is carried out filtering then after; With the second intermediate frequency amplifier B signal attenuation is compensated once more; Then send into three-mixer and obtain third level intermediate frequency, behind the 3rd intermediate frequency amplifier amplifying signal, filtering unwanted signal composition in the 3rd intermediate-frequency filter; Deliver to the 4th frequency mixer then and frequency translation is returned the frequency that begins input signal most; Carry out signal at output amplifier A then and amplify, send into automatic gain control attenuator and be used for automatic gain control AGC, at last through output amplifier B; Signal is amplified to the output requirement of frequency agility main frame; Signal is sent to digital television power amplifier then, after signal is amplified to launch requirements, delivers to retransmitting antenna.
The effect that the present invention is useful: 1, on principle, realize novel circuit structure, signal is transmitted in same frequency, Digital Television is with the different frequency range of transmitting frequently, different power outputs.Serviceability is good, can guarantee that the quality of digital television signal and the signal of blind area cover, and make digital television signal constantly extend forward; 2, have the frequency agility function, in 470MHz～862MHz scope, 49 digital TV channels are arranged, each channel bandwidth 8M.Can with the working channel of software arrangements frequency agile system, need not to wait for according to the needs of practical engineering application, need not restart, efficient and convenient.3, on performance, really realized unattended operation, can adjust each item running parameter, the mode of operation of this device through the remote wireless control system; 4, used the structure that more is prone to installation on the engineering, made that installation is more convenient, the set-up time is within 2 hours; 5, owing to adapt to indoor installation, the occasion of therefore using is extensive.In sum, this DTV has epoch making significance with the use of transmitting frequency agile system frequently, and has more use value.
Description of drawings
Fig. 1 is a principle block diagram of the present invention;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is the circuit diagram of the low noise amplifier part of the medium and small signal processing unit of the present invention;
Fig. 4 is the circuit diagram of the IF process part of the medium and small signal processing unit of the present invention;
Fig. 5 is the circuit diagram of the output amplifier section of the medium and small signal processing unit of the present invention;
Fig. 6 is the circuit diagram of the control section of the medium and small signal processing unit of the present invention;
Fig. 7 is the local oscillation signal LO1 of clock generation unit among the present invention and the circuit diagram of LO4 generator;
Fig. 8 is the local oscillation signal LO2 of clock generation unit among the present invention and the circuit diagram of LO3 generator;
Fig. 9 is the circuit diagram of the control section of clock generation unit among the present invention;
Description of reference numerals: 1-donor antenna, 2-frequency agility main frame, 3-digital television power amplifier, 4-retransmitting antenna, 5-small-signal processing unit; The 6-clock generation unit, 7-CPU control unit, 8-GSM MODEM unit, 9-power conversion unit, 10-power supply; The 11-low noise amplifier, 12-numerical-control attenuator A, 13-signal amplifier A, 14-numerical-control attenuator B, 15-signal amplifier B; 16-first frequency mixer, 17-first intermediate frequency amplifier, 18-first intermediate-frequency filter, 19-second frequency mixer, the 20-second intermediate frequency amplifier A; 21-second intermediate-frequency filter, the 22-second intermediate frequency amplifier B, 23-three-mixer, 24-the 3rd intermediate frequency amplifier, 25-the 3rd intermediate-frequency filter; 26-the 4th frequency mixer, 27-output amplifier A, 28-automatic gain control attenuator, 29-output amplifier B; 30-input power detector, 31-output power detector, 32-local oscillation signal LO1 and LO4 generator, 33-local oscillation signal LO2 and LO3 generator.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described; But should understand these embodiment is not restriction scope of the present invention; Under the situation of the spirit and scope of the present invention; Those skilled in the art can make the present invention and change and improve so that it is fit to different operating positions, condition and embodiment.
Referring to above description of drawings; The present invention relates to a kind of DTV that is used for the frequency agile system (see figure 2) of transmitting frequently; Mainly comprise donor antenna 1, frequency agility main frame 2, digital television power amplifier 3, retransmitting antenna 4, input power detector 30 and output power detector 31, the donor antenna 1 that wherein is used to receive the digital television signal of autonomous cell site is connected with frequency agility main frame 2 inputs through coaxial wire; Frequency agility main frame 2 is made up of small-signal processing unit 5, clock generation unit 6, CPU control unit 7, GSM MODEM unit 8, power conversion unit 9 and 10 of power supplys; Wherein small-signal processing unit 5 and clock generation unit 6 according to four signals one by one correspondence be connected, CPU control unit 7 is connected with small-signal processing unit 5, clock generation unit 6, GSM MODEM unit 8 respectively.The digital television power amplifier 3 that is used for power amplification is connected with frequency agility main frame 2 outputs through coaxial wire; The retransmitting antenna 4 that is used to launch digital television signal is connected with digital television power amplifier 3 outputs through coaxial wire.
The wherein said donor antenna 1 main digital television signal that receives autonomous cell site, the requirement of antenna be certain directivity must be arranged, the input standing wave is little, lightning protection properties good, receptivity is stable.Retransmitting antenna 4 is with launching from the signal of DTV power amplifier; Retransmitting antenna 4 has certain directivity, the output standing wave is little, lightning protection properties good; The requirement that also should have high power level in addition; Little with the back lobe of donor antenna 1, promptly the isolation between retransmitting antenna 4 and the donor antenna 1 wants big.
Described frequency agility main frame 2 (like Fig. 1) is made up of small-signal processing unit 5, clock generation unit 6, CPU control unit 7, GSM MODEM unit 8, power conversion unit 9 and 10 of power supplys.Wherein small-signal processing unit 5 comprises that mainly low noise amplifier part, IF process part, output amplifier section and control section constitute; And clock generation unit 6 mainly comprises shake signal LO1 and LO4 generator part, shake signal LO2 and LO3 generator part and control section constitute.
In the low noise amplifier part (like Fig. 3) of described small-signal processing unit 5,1U1 carries out the amplification of initial one-level with input signal, and 1C1,1C2 and 1L1 mate input, have realized the function of LNA fault warning during 1R2, the 1R3 etc.; 1L4,1L5,1L6,1L7,1L8,1C7,1C8,1C9,1C10,1C11 have realized the filter of a uhf band, can tentatively filter the interference signal beyond the uhf band; 1R5,1R6,1R7,1R8,1R9 have constituted a power divider; Main path signal will be proceeded to handle; Signal then is sent to 1U2 and carries out input power and detect from the road, thereby has realized functions such as input power detection, the alarm of input underpower, the alarm of input power overpower; 1U3 and 1U5 along with the size of input signal is done corresponding variation, make signal level on the radio frequency link keep relative constant to the decay meeting of signal, in addition, and temperature gain compensation and frequency gain compensation also realization here; 1U4 and 1U6 then amplify signal.
In the IF process of described small-signal processing unit 5 part (like Fig. 4), the signal of partly coming from low noise amplifier will be transformed to first order intermediate frequency through behind the 2U1; 2U2 amplifies signal, and 2F1 is the filter on first order intermediate frequency, the spurious signal that filtering is useless; 2U3 continues signal frequency converting to second utmost point intermediate frequency, and 2L1,2L2,2L3,2C10,2C11 have constituted a low pass filter on the second level intermediate frequency, the unwanted signal of preliminary filtering HFS; 2U4 and 2U5 amplify signal; 2F2 is a SAW filter, can be with the unwanted signal filtering beyond the required channel; 2U6 is with signal frequency converting to the three utmost point intermediate frequencies then; 2F3 and 2F4 are the band pass filters on this frequency, the spurious signal that the filtering mixing produces; 2U7 then amplifies signal; 2U8 then carries out mixing to signal the 4th time, makes digital television signal get back on the frequency of the signal of original input.
In the output amplifier section (like Fig. 5) of described small-signal processing unit 5,3L1,3L2,3L3,3C1,3C2 have constituted a low pass filter, with each harmonic wave and spuious filtering; 3U1 and 3U3 provide enough gains, signal are amplified to the signal output requirement of frequency agility main frame; But 3U2 can carry out controlling attenuation and 3Q1,3U5,3U4 have constituted the power output detection together to signal, and power output setting and automatic gain control make the output signal constant all the time on the output level of setting; 3U8 has realized the detection and the monitoring of electric current; 3U9 is controlling the power supply of radio circuit, has realized the Kai Heguan of radio frequency.
4U6 is the MCU that realizes each logic function in the control section of described small-signal processing unit 5 (like Fig. 6); 4U5 is the RS485 conversion of signals, makes module communicate with the external world and is connected, and realizes the reporting of inquiry, setting and alarm of each parameter; 4U9 is the temperature detection chip, for temperature gain compensation provides reliable temperature environment parameter; 4U10 is EEPROM, is used to keep the setting of each parameter; 4U8 is a digital to analog converter, and the digital signal that MCU is used to control power output converts analog signal into, for power output provides a reference level.
In the local oscillation signal LO1 of described clock generation unit 6 and LO4 generator 32 parts (like Fig. 7), 2X1 provides a stable clock signal reference source; 2U1 is a phase-locked loop chip; Some components and parts of 2U2 and its periphery have constituted a loop filter, and the pulse signal that phase-locked loop chip is exported is transformed into a direct current signal; 2VCO1 is a voltage controlled oscillator, under stable reference voltage, produces a stable local oscillation signal source; 2U3 amplifies signal; 2R17,2R18,2R19 divide two-way with signal, and one the tunnel feeds back to phase-locked loop chip, and another road is divided into two-way by 2R26,2R27,2R28 once more, export after the amplification through 2U4 and 2U5 respectively.
In the circuit diagram (like Fig. 8) of the local oscillation signal LO2 of clock generation unit and LO3 generator 33,3X1 provides a stable clock signal reference source; 3U1 is a phase-locked loop chip; 3C14,3R8,3C15,3R9,3C16 have constituted a loop filter, and the pulse signal that phase-locked loop chip is exported is transformed into a direct current signal; 3VCO1 is a voltage controlled oscillator, under stable reference voltage, produces a stable local oscillation signal source; 3U2 amplifies signal; 3R14,3R15,3R16 divide two-way with signal, and one the tunnel feeds back to phase-locked loop chip, and another road is divided into two-way by 3R23,3R24,3R25 once more, export after the amplification through 3U3 and 3U4 respectively.
1U4 is the MCU that realizes each logic function in the control section of described clock generation unit 6 (like Fig. 9); 1U1 is the RS485 conversion of signals, makes module communicate with the external world and is connected, and realizes the reporting of inquiry, setting and alarm of each parameter; 1U2 is the temperature detection chip, for the temperature frequency compensation provides reliable temperature environment parameter; 1U3 is EEPROM, is used to keep the setting of each parameter; 1U8 has realized the detection and the monitoring of electric current.
The realization of above-mentioned functions all can realize through CPU control unit 7.Adopt ARM as main control MCU; Extend out SRAM, the equipment that guaranteed can embed real time operating system, can preserve mass data; Extend out Serial E EROM, be specifically designed to system at application upgrade (IAP); Extend out the serial ports expansion chip, can realize multiple communication mode easily; Select GPRS module 8 for use, can use multiple communication mode such as sms and gprs to realize the real-time monitoring and the warning of equipment; Have power supply main standby and switch, can realize functions such as power down warning; Software section: embedded real time operating system guarantees the stable, reliable of equipment operation; Have application upgrade (IAP) function, guarantee because the change of network etc. needs upgrade-system, mode that can long-range unattended duty is upgraded; Network management protocol is UNICOM's NMP; Test is separately all passed through in The software modularized design, each module, has guaranteed the stable, reliable of equipment operation.
It is understandable that, for a person skilled in the art, technical scheme of the present invention and inventive concept are equal to replacement or change the protection range that all should belong to the appended claim of the present invention.
Claims (1)
1. one kind is used for DTV with the frequency agile system of transmitting frequently; It is characterized in that: comprise donor antenna (1), frequency agility main frame (2), digital television power amplifier (3) and retransmitting antenna (4), the donor antenna (1) that is used to receive the digital television signal of autonomous cell site is connected with frequency agility main frame (2) input through coaxial wire; Frequency agility main frame (2) is made up of small-signal processing unit (5), clock generation unit (6), CPU control unit (7), GSM MODEM unit (8), power conversion unit (9) and power supply (10); Wherein small-signal processing unit (5) and clock generation unit (6) according to four signals one by one correspondence be connected, CPU control unit (7) is connected with small-signal processing unit (5), clock generation unit (6), GSM MODEM unit (8) respectively; The digital television power amplifier (3) that is used for power amplification is connected with frequency agility main frame (2) output through coaxial wire; The retransmitting antenna (4) that is used to launch digital television signal is connected with digital television power amplifier (3) output through coaxial wire; Described small-signal processing unit (5) comprises low noise amplifier part, IF process part, output amplifier section and control section; Clock generation unit (6) comprises local oscillation signal LO1 and LO4 generator (32), local oscillation signal LO2 and LO3 generator (33) and control section; Donor antenna (1) is sent into the low noise amplifier (11) in the frequency agility main frame (2) after receiving signal, and signal is amplified into numerical-control attenuator A (12), amplifies once more with signal amplifier A (13); Get into numerical-control attenuator B (14) once more signal level is controlled and regulated, the signal that comes out then arrives first order intermediate frequency through first frequency mixer (16) with frequency translation then through signal amplifier B (15); After the decay with first intermediate frequency amplifier (17) compensating signal, first order intermediate frequency is carried out filtering, then carry out the mixing second time with first intermediate-frequency filter (18); Through obtaining second level intermediate frequency behind second frequency mixer (19), with the second intermediate frequency amplifier A (20) signal attenuation is compensated, use second intermediate-frequency filter (21) that second level intermediate frequency is carried out filtering then after; Use the second intermediate frequency amplifier B (22) that signal attenuation is compensated once more; Then send into three-mixer (23) and obtain third level intermediate frequency, behind the 3rd intermediate frequency amplifier (24) amplifying signal, filtering unwanted signal composition in the 3rd intermediate-frequency filter (25); Deliver to the 4th frequency mixer (26) then and frequency translation is returned the frequency that begins input signal most; Carry out signal at output amplifier A (27) then and amplify, send into automatic gain control attenuator (28) and be used for automatic gain control AGC, at last through output amplifier B (29); Signal is amplified to the output requirement of frequency agility main frame; Signal is sent to digital television power amplifier (3) then, after signal is amplified to launch requirements, delivers to retransmitting antenna (4).
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| CN200910258090A CN101835004B (en) | 2009-12-08 | 2009-12-08 | Frequency agility system for co-frequency forwarding of digital television |
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| CN200910258090A CN101835004B (en) | 2009-12-08 | 2009-12-08 | Frequency agility system for co-frequency forwarding of digital television |
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| CN101835004A CN101835004A (en) | 2010-09-15 |
| CN101835004B true CN101835004B (en) | 2012-09-19 |
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| CN103618578B (en) * | 2013-11-07 | 2015-09-23 | 中国电子科技集团公司第四十一研究所 | A kind of radio-frequency signal power agility method based on numerical control attenuation |
| CN103626002B (en) * | 2013-11-12 | 2016-02-10 | 张洋 | The uninterrupted formula elevator alarm device of the interactive cross complaint of one core |
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| CN1700746A (en) * | 2005-05-23 | 2005-11-23 | 浙江三维通信股份有限公司 | Power intensifier system for cofrequency transmitting of digital television |
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| CN201274529Y (en) * | 2008-09-11 | 2009-07-15 | 福建三元达通讯股份有限公司 | Frequency selecting and converting forwarding device for digital television |
| CN201629801U (en) * | 2009-12-08 | 2010-11-10 | 三维通信股份有限公司 | Agile frequency conversion system for digital television transmitting in identical frequency |
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- 2009-12-08 CN CN200910258090A patent/CN101835004B/en active Active
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| CN1700746A (en) * | 2005-05-23 | 2005-11-23 | 浙江三维通信股份有限公司 | Power intensifier system for cofrequency transmitting of digital television |
| CN1901673A (en) * | 2006-07-25 | 2007-01-24 | 浙江三维通信股份有限公司 | Same frequency repeating power increasing device system using optic fiber transmission digita TV signal |
| CN201274529Y (en) * | 2008-09-11 | 2009-07-15 | 福建三元达通讯股份有限公司 | Frequency selecting and converting forwarding device for digital television |
| CN201629801U (en) * | 2009-12-08 | 2010-11-10 | 三维通信股份有限公司 | Agile frequency conversion system for digital television transmitting in identical frequency |
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