CN111030772A - Short wave broadcast transmitting system based on ionosphere multi-station oblique measurement calibration - Google Patents
Short wave broadcast transmitting system based on ionosphere multi-station oblique measurement calibration Download PDFInfo
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- CN111030772A CN111030772A CN201911351191.5A CN201911351191A CN111030772A CN 111030772 A CN111030772 A CN 111030772A CN 201911351191 A CN201911351191 A CN 201911351191A CN 111030772 A CN111030772 A CN 111030772A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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- Physics & Mathematics (AREA)
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a short-wave broadcast transmitting system based on ionosphere multi-station inclined survey calibration, which can improve the efficiency of short-wave broadcast coverage, realize coverage of different distance areas by utilizing a single broadcast station and save broadcast resources. The ionosphere inclination measurement subsystem comprises an ionosphere inclination measurement subsystem, an emission subsystem and a control subsystem, wherein the control subsystem is respectively connected with the ionosphere inclination measurement subsystem and the emission subsystem. The invention has the beneficial effects that: the invention can acquire the ionosphere information of a large area in real time, and can calculate the optimal broadcast antenna transmitting elevation according to the ionosphere virtual height and other information, thereby realizing accurate broadcast coverage. The system only needs to be provided with an ionosphere oblique measurement receiver, so that the cost is low and the implementation is simple. The invention adjusts the transmitting wave beam of the broadcasting antenna in a numerical control mode, the transmitting elevation angle of the broadcasting antenna is variable, the broadcasting coverage of different distances is realized, and the cost-effectiveness ratio is high.
Description
Technical Field
The invention belongs to a short-wave broadcast transmitting system, and particularly relates to a short-wave broadcast transmitting system based on ionosphere multi-station inclined survey calibration.
Background
Short-wave broadcast signals with beyond visual range are transmitted in an sky wave mode, due to the characteristic of short-wave sky wave transmission, the coverage area of the broadcast signals depends on the transmitting elevation angle of a broadcast antenna and the height of an ionized layer, and the transmitting elevation angle is adjusted according to real-time information of the ionized layer when the broadcast signals cover a target area. The traditional short wave broadcasting station adopts a multi-station cooperative mode to realize the coverage of areas with different distances, the emission elevation angle of a broadcasting antenna of each short wave broadcasting station is not adjustable, different short wave broadcasting stations are deployed at different positions away from the coverage area, and the station or stations are determined to be used for broadcasting coverage according to the conditions of emission frequency and the like, so that the waste of broadcasting resources is caused, and the cost-effectiveness ratio is low.
Disclosure of Invention
The invention aims to provide a shortwave broadcast transmitting system based on ionosphere multi-station inclined calibration, which can improve the efficiency of shortwave broadcasting, realize broadcast coverage of different distance areas by using a single broadcast station and save broadcast resources.
The technical scheme of the invention is as follows: a short wave broadcast transmitting system based on ionosphere multi-station inclined measurement calibration comprises an ionosphere inclined measurement subsystem, an transmitting subsystem and a control subsystem, wherein the control subsystem is respectively connected with the ionosphere inclined measurement subsystem and the transmitting subsystem.
The ionosphere inclinometry sub-system receives ionosphere detection signals transmitted by a plurality of ionosphere inclinometry stations in the country, carries out ionosphere reconstruction and acquires information such as ionosphere concentration, half thickness and virtual height.
The ionosphere oblique measurement system comprises a receiving antenna and an ionosphere oblique measurement receiver, wherein the receiving antenna outputs a received signal to the ionosphere oblique measurement receiver.
The ionosphere oblique measurement receiver comprises a plurality of ionosphere external stations, receiving antennas, receiving channels, a signal processing module, a computer, a synchronization module and a GPS antenna, wherein each ionosphere external station outputs signals to the receiving antennas, the receiving antennas transmit the received signals to the receiving channels, the receiving channels output the signals to the signal processing module, the signal processing module outputs the signals to the computer, the computer outputs the signals through a network, and the synchronization module is respectively connected with the receiving channels, the signal processing module, the computer and the GPS antenna to perform synchronous processing on the signals.
The transmitting subsystem comprises a multichannel exciter, a short wave power amplifier group and a broadcasting antenna array, wherein the multichannel exciter outputs signals to each short wave power amplifier respectively, and each short wave power amplifier outputs signals to the broadcasting antenna array respectively.
The multi-channel exciter comprises a power supply unit, a control unit, a signal processing unit, a calibration unit, an audio unit, a radio frequency unit and a panel unit.
The main control unit is connected with the signal processing unit through an RS232 interface, the main control unit carries out input and output of signals or data through the RS232 interface and a network control interface, and the main control unit is connected with the panel unit; the signal processing unit outputs 8 paths of radio frequency signals to the radio frequency unit, the radio frequency unit outputs 8 paths of radio frequency outputs, the audio unit outputs audio signals and clock signals to the signal processing unit, the signal processing unit performs power amplifier control on the audio unit, the audio unit receives external audio and power amplifier control signals, the audio unit outputs clock signals to the calibration unit, 8 paths of radio frequency feedback are input to the calibration unit, and the calibration unit inputs phase difference to the signal processing unit; the power supply unit provides power for the control unit, the signal processing unit, the calibration unit, the audio unit, the radio frequency unit and the panel unit.
The power amplifier comprises a monitoring unit, an one-to-eight distributor, 8 500W power amplifier modules, a power combiner and a power supply unit, wherein the power supply unit supplies power to the monitoring unit, the one-to-eight distributor, the power combiner and the 8 500W power amplifier modules, and the power supply unit is connected with 220V alternating current; wherein, the monitoring unit receives the radio frequency input, and with signal output to an eight-in-one distributor, 8 500W power amplifier modules are connected respectively to an eight-in-one distributor, and with signal output to 500W power amplifier module 1, 500W power amplifier module 2, 500W power amplifier module 3, 500W power amplifier module 4, 500W power amplifier module 5, 500W power amplifier module 6, 500W power amplifier module 7 and 500W power amplifier module 8, 500W power amplifier module 1, 500W power amplifier module 2, 500W power amplifier module 3, 500W power amplifier module 4, 500W power amplifier module 5, 500W power amplifier module 6, 500W power amplifier module 7 and 500W power amplifier module 8 are respectively with signal output to the power combiner, power combiner output, the power combiner is with signal detection output to the monitoring unit simultaneously.
The control subsystem has the functions of sending commands to the transmitting subsystem and the ionosphere inclination measurement subsystem, receiving the equipment state information reported by each subsystem and realizing the amplitude phase calibration function among a plurality of transmitting channels.
The control subsystem comprises a computer and a network switch, and the computer is connected with the network switch.
The invention has the beneficial effects that: the invention can acquire the ionosphere information of a large area in real time, and can calculate the optimal broadcast antenna transmitting elevation according to the ionosphere virtual height and other information, thereby realizing accurate broadcast coverage. The system only needs to be provided with an ionosphere oblique measurement receiver, so that the cost is low and the implementation is simple. The invention adjusts the transmitting wave beam of the broadcasting antenna in a numerical control mode, the transmitting elevation angle of the broadcasting antenna is variable, the broadcasting coverage of different distance areas is realized, and the cost-efficiency ratio is high.
Drawings
FIG. 1 is a schematic diagram of a shortwave broadcast transmitting system based on ionosphere multi-station calibration and calibration;
FIG. 2 is a schematic diagram of an ionospheric bias-scoring system;
FIG. 3 is a schematic diagram of a multi-channel exciter;
fig. 4 is a schematic diagram of a power amplifier.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1, a short-wave broadcast transmitting system based on ionosphere multi-station calibration and calibration comprises an ionosphere calibration and measurement subsystem, a transmitting subsystem and a control subsystem. The control subsystem is respectively connected with the ionosphere inclined measurement subsystem and the emission subsystem.
The ionospheric inclinometer subsystem, the transmission subsystem, and the control subsystem are described in detail below with reference to the drawings.
Ionospheric inclinometer subsystem:
the ionosphere oblique measurement system is used for receiving ionosphere detection signals transmitted by a plurality of ionosphere oblique measurement stations in the country, carrying out ionosphere reconstruction and acquiring information such as ionosphere concentration, half thickness, virtual height and the like.
The ionosphere oblique measurement receiver can receive detection signals transmitted by 5 ionosphere external stations at most, the detection signals are transmitted by different external stations at different moments, and the oblique measurement receiver is synchronized with the external stations through a GPS antenna and an internal synchronization module.
The receiving antenna is used for receiving detection signals transmitted by an ionized layer external station and transmitting the signals to a receiving channel, the receiving channel converts radio frequency into intermediate frequency signals, the signal processing module carries out AD acquisition on the intermediate frequency signals and converts the intermediate frequency signals into digital signals, and an ionized layer data analysis function is completed to obtain ionized layer parameters.
The computer is used for communicating with the outside, and after receiving an external command through a network, the computer sends an instruction to the synchronization module, the signal processing module and the like so that each module works in a designated working mode.
As shown in fig. 1, the ionospheric inclinometry system includes a receiving antenna, and an ionospheric inclinometry receiver. The receiving antenna outputs the received signal to the ionospheric bias measurement receiver.
As shown in fig. 2, the ionospheric bias measurement receiver includes a plurality of ionospheric outstations, a receiving antenna, a receiving channel, a signal processing module, a computer, a synchronization module, and a GPS antenna, each ionospheric outstation outputs a signal to the receiving antenna, the receiving antenna transmits the received signal to the receiving channel, the receiving channel outputs the signal to the signal processing module, the signal processing module outputs the signal to the computer, the computer outputs the signal through a network, and the synchronization module is connected with the receiving channel, the signal processing module, the computer, and the GPS antenna, respectively, to perform synchronization processing on the signal.
A transmitting subsystem:
as shown in fig. 1, the transmitting subsystem includes a multi-channel exciter, a short-wave power amplifier set and a broadcasting antenna array. The multichannel exciter is used for generating exciting signals of a plurality of channels, and the phase and the amplitude among output signals of the channels can be adjusted according to needs. The short-wave power amplifier group is used for carrying out power amplification on the excitation signals of the channels. The broadcast antenna array is used for radiating broadcast signals. In an embodiment of the invention, the multi-channel exciter outputs a signal to each short wave power amplifier separately, each short wave power amplifier outputting a signal to the broadcast antenna array separately.
As shown in fig. 3, the multi-channel exciter includes a power supply unit, a control unit, a signal processing unit, a calibration unit, an audio unit, a radio frequency unit, and a panel unit.
The main control unit is connected with the signal processing unit through an RS232 interface, the main control unit carries out input and output of signals or data through the RS232 interface and a network control interface, and the main control unit is connected with the panel unit; the signal processing unit outputs 8 paths of radio frequency signals to the radio frequency unit, the radio frequency unit outputs 8 paths of radio frequency outputs, the audio unit outputs audio signals and clock signals to the signal processing unit, the signal processing unit performs power amplifier control on the audio unit, the audio unit receives external audio and power amplifier control signals, the audio unit outputs clock signals to the calibration unit, 8 paths of radio frequency feedback are input to the calibration unit, and the calibration unit inputs phase difference to the signal processing unit; the power supply unit provides power for the control unit, the signal processing unit, the calibration unit, the audio unit, the radio frequency unit and the panel unit.
The main control unit is a control center of the exciter, realizes control of other modules, completes communication with superior equipment and is realized by a computer module. Its main function includes receiving and processing the instruction sent from the superior device or panel; parameters such as operating frequency, broadcast pattern, transmit power, etc. may be set.
The signal processing unit is a core module for realizing the function of the exciter and mainly comprises an interface circuit, logic control, a DSP, audio processing, A/D, D/A and the like. It outputs 8 broadcast signals according to the control command sent by the control unit and can realize the control of the power amplifier.
The calibration unit mainly comprises circuits such as a DSP, an FPGA and 8 radio frequency A/D, and has the function of calculating phase difference among all paths of transmitters and reporting the phase difference to the signal processing unit for phase consistency calibration.
The audio unit mainly completes the pre-processing of the audio signal and sends the processed audio signal to the processing unit. Meanwhile, the audio unit provides required working clock signals for the signal processing unit and the calibration unit. The radio frequency unit mainly completes the amplification of 8 paths of radio frequency signals. The power supply unit provides power supply required by each unit of the system. The front panel unit provides a man-machine interface.
The power amplifier is mainly used for amplifying the power of the broadcast signals generated by the multi-channel exciter, and the output power is 3 kW.
As shown in fig. 4, the power amplifier includes a monitoring unit, an one-to-eight distributor, 8 500W power amplifier modules, a power combiner, and a power supply unit. The power supply unit supplies power to the monitoring unit, the one-to-eight distributor, the power synthesizer and the 8 500W power amplification modules, and is connected with 220V alternating current; wherein, the monitoring unit receives the radio frequency input, and with signal output to an eight-in-one distributor, 8 500W power amplifier modules are connected respectively to an eight-in-one distributor, and with signal output to 500W power amplifier module 1, 500W power amplifier module 2, 500W power amplifier module 3, 500W power amplifier module 4, 500W power amplifier module 5, 500W power amplifier module 6, 500W power amplifier module 7 and 500W power amplifier module 8, 500W power amplifier module 1, 500W power amplifier module 2, 500W power amplifier module 3, 500W power amplifier module 4, 500W power amplifier module 5, 500W power amplifier module 6, 500W power amplifier module 7 and 500W power amplifier module 8 are respectively with signal output to the power combiner, power combiner output, the power combiner is with signal detection output to the monitoring unit simultaneously.
The monitoring unit carries out power adjustment and preamplification on input radio frequency signals, the amplified signals are respectively sent to 8 500W power amplification modules for power amplification through an eight-way distributor, and 8 paths of amplified power signals output 3kW power signals through an eight-in-one power combiner and are output. The power synthesizer has power detecting circuit to detect the forward and reverse power signals for standing-wave ratio protection and power control.
The power supply unit inputs 220V alternating current power supply and provides +48V direct current stabilized power supply and +24V direct current stabilized power supply for the power amplifier.
The broadcast antenna array adopts a space power synthesis technology, has 8 array elements in total, and adopts a 2 x 4 arrangement mode to perform space power synthesis and then radiate signals generated by 8 3kW transmitters. In order to meet the requirement of spatial synthesis, the signals of each transmission channel need to conform to a certain relation, and therefore, a control subsystem needs to control the phase and the amplitude of an excitation signal through a multi-channel exciter.
A control subsystem:
the control subsystem has the functions of sending commands to the transmitting subsystem and the ionosphere oblique measurement subsystem, receiving the equipment state information reported by each subsystem and realizing the amplitude phase calibration function among a plurality of transmitting channels. The control subsystem comprises a computer and a network switch, and the computer is connected with the network switch.
Claims (10)
1. The utility model provides a shortwave broadcasting transmitting system based on ionosphere multistation survey is calibrated to one side which characterized in that: the ionosphere inclination measurement subsystem comprises an ionosphere inclination measurement subsystem, an emission subsystem and a control subsystem, wherein the control subsystem is respectively connected with the ionosphere inclination measurement subsystem and the emission subsystem.
2. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 1, wherein: the ionosphere inclinometry sub-system receives ionosphere detection signals transmitted by a plurality of ionosphere inclinometry stations in the country, carries out ionosphere reconstruction and acquires information such as ionosphere concentration, half thickness and virtual height.
3. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 2, wherein: the ionosphere oblique measurement system comprises a receiving antenna and an ionosphere oblique measurement receiver, wherein the receiving antenna outputs a received signal to the ionosphere oblique measurement receiver.
4. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 3, wherein: the ionosphere oblique measurement receiver comprises a plurality of ionosphere external stations, receiving antennas, receiving channels, a signal processing module, a computer, a synchronization module and a GPS antenna, wherein each ionosphere external station outputs signals to the receiving antennas, the receiving antennas transmit the received signals to the receiving channels, the receiving channels output the signals to the signal processing module, the signal processing module outputs the signals to the computer, the computer outputs the signals through a network, and the synchronization module is respectively connected with the receiving channels, the signal processing module, the computer and the GPS antenna to perform synchronous processing on the signals.
5. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 1, wherein: the transmitting subsystem comprises a multichannel exciter, a short wave power amplifier group and a broadcasting antenna array, wherein the multichannel exciter outputs signals to each short wave power amplifier respectively, and each short wave power amplifier outputs signals to the broadcasting antenna array respectively.
6. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 5, wherein: the multi-channel exciter comprises a power supply unit, a control unit, a signal processing unit, a calibration unit, an audio unit, a radio frequency unit and a panel unit.
7. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 6, wherein: the main control unit is connected with the signal processing unit through an RS232 interface, the main control unit carries out input and output of signals or data through the RS232 interface and a network control interface, and the main control unit is connected with the panel unit; the signal processing unit outputs 8 paths of radio frequency signals to the radio frequency unit, the radio frequency unit outputs 8 paths of radio frequency outputs, the audio unit outputs audio signals and clock signals to the signal processing unit, the signal processing unit performs power amplifier control on the audio unit, the audio unit receives external audio and power amplifier control signals, the audio unit outputs clock signals to the calibration unit, 8 paths of radio frequency feedback are input to the calibration unit, and the calibration unit inputs phase difference to the signal processing unit; the power supply unit provides power for the control unit, the signal processing unit, the calibration unit, the audio unit, the radio frequency unit and the panel unit.
8. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 5, wherein: the power amplifier comprises a monitoring unit, an one-to-eight distributor, 8 500W power amplifier modules, a power combiner and a power supply unit, wherein the power supply unit supplies power to the monitoring unit, the one-to-eight distributor, the power combiner and the 8 500W power amplifier modules, and the power supply unit is connected with 220V alternating current; wherein, the monitoring unit receives the radio frequency input, and with signal output to an eight-in-one distributor, 8 500W power amplifier modules are connected respectively to an eight-in-one distributor, and with signal output to 500W power amplifier module 1, 500W power amplifier module 2, 500W power amplifier module 3, 500W power amplifier module 4, 500W power amplifier module 5, 500W power amplifier module 6, 500W power amplifier module 7 and 500W power amplifier module 8, 500W power amplifier module 1, 500W power amplifier module 2, 500W power amplifier module 3, 500W power amplifier module 4, 500W power amplifier module 5, 500W power amplifier module 6, 500W power amplifier module 7 and 500W power amplifier module 8 are respectively with signal output to the power combiner, power combiner output, the power combiner is with signal detection output to the monitoring unit simultaneously.
9. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 1, wherein: the control subsystem has the functions of sending commands to the transmitting subsystem and the ionosphere inclination measurement subsystem, receiving the equipment state information reported by each subsystem and realizing the amplitude phase calibration function among a plurality of transmitting channels.
10. The ionospheric multistation calibration based short-wave broadcast transmission system of claim 1, wherein: the control subsystem comprises a computer and a network switch, and the computer is connected with the network switch.
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| CN201911351191.5A CN111030772A (en) | 2019-12-24 | 2019-12-24 | Short wave broadcast transmitting system based on ionosphere multi-station oblique measurement calibration |
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2019
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| CN101310453A (en) * | 2005-11-17 | 2008-11-19 | Tdf公司 | System of transmit antennas adapted to propagation conditions for radio broadcasting |
| CN105655711A (en) * | 2016-01-13 | 2016-06-08 | 深圳市顶精密五金有限公司 | Short-wave transmission blind area elimination system and method |
| US20190187295A1 (en) * | 2017-12-18 | 2019-06-20 | Korea Advanced Institute Of Science And Technology (Kaist) | Method and system for local-area differential gnss for uav navigation, and for generating optimal protection level and geometry screening therefor |
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