CN110808802A - Airborne frequency modulation broadcast transmitting system - Google Patents
Airborne frequency modulation broadcast transmitting system Download PDFInfo
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- CN110808802A CN110808802A CN201911169958.2A CN201911169958A CN110808802A CN 110808802 A CN110808802 A CN 110808802A CN 201911169958 A CN201911169958 A CN 201911169958A CN 110808802 A CN110808802 A CN 110808802A
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- power amplifier
- power
- exciter
- antenna
- controller
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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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
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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
- H04B1/0466—Fault detection or indication
-
- 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
-
- 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
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transmitters (AREA)
Abstract
The invention provides an airborne frequency modulation broadcast transmitting system, comprising: the power distribution device comprises a cabinet, a controller, a first exciter, a second exciter, a switcher, a first power amplifier, a second power amplifier, a filtering switch component, a first power amplifier power supply, a second power amplifier power supply, a power distribution device, a first antenna and a second antenna. The method is mainly applied to a broadcast transmitting system taking a large airplane as a carrier. The system works in an ultrashort wave frequency band, and has larger transmitting power and wider working bandwidth. The highest output power of the system is higher than 1 kilowatt, and wide-area effective coverage and local-area signal suppression of the transmitted signals are realized. Except the antenna, all units of the system are installed in the cabinet, and each unit adopts a modular design, so that the system has good interchangeability, a self-detection function and convenience in maintenance.
Description
Technical Field
The invention belongs to the field of electronic communication, and mainly relates to an airborne frequency modulation broadcast transmitting system which is mainly applied to an airborne broadcast transmitting system.
Background
As a communication system with relatively early construction time and wide coverage, a broadcasting system has long been an important media propagation means in social life. Due to the advantages of mature system technology, low construction cost, rapid distribution speed and the like, the system is still an important mass media propagation system even in the highly developed mobile internet today.
The broadcasting system features that information is transmitted in single direction and transmitted by one broadcasting transmitter and the corresponding information can be received by all the broadcasting receivers in the signal coverage range. The disadvantage of this simplex one-way system is that users in the coverage area of the broadcast transmitter will not receive information when the transmitter is not operating properly. The existing broadcasting system mainly comprises a transmitter arranged on the ground and a receiver of a user, and the system is easy to lose the capability when a natural disaster happens. For example: the ground power supply is interrupted due to the fact that a strong earthquake occurs in one area, the broadcasting transmitter in the area cannot broadcast due to the fact that power supply is lost, all users in the area cannot receive optical broadcasting signals, and people in a disaster area are seriously affected in obtaining rescue information.
Disclosure of Invention
The invention aims to provide an airborne frequency modulation broadcast transmitting system which works in an ultrashort wave frequency band, has larger transmitting power and wider working bandwidth and has good interchangeability.
The invention is implemented by the following technical scheme, and is characterized in that: comprises a controller, a first exciter, a first power amplifier power supply, a first power amplifier, a switcher, a filter switch component, a second antenna, a first antenna, a second exciter, a second power amplifier and a second power amplifier power supply, the output end of the controller is respectively connected with the input ends of the first exciter, the switcher and the second exciter, the output end of the first exciter is connected with the input end of the first power amplifier, the output end of the switcher is respectively connected with the input ends of the first power amplifier, the second power amplifier and the filtering switch component, the output end of the second exciter is connected with the output end of the second power amplifier, the output end of the filtering switch component is respectively connected with the input ends of the first antenna and the second antenna, the input end of the first power amplifier is connected with the output end of the first power amplifier power supply, and the input end of the second power amplifier is connected with the output end of the second power amplifier power supply.
This broadcast transmitting system is except first antenna, second antenna, controller, first exciter, first power amplifier power, first power amplifier, switch, filter switch subassembly, second exciter, second power amplifier install in the rack, provide the power by distribution device, convert the airborne 28V DC power supply of input into the power that work needs, and operating frequency is 360MHz ~470MHz, the inside liquid cooling pipeline that is provided with of both sides face of rack, distribution device, the bottom of rack are provided with the liquid cooling pipeline, and the rack adopts rack 42U standard rack, and the degree of depth is 800 mm.
The controller can carry out local configuration to the system through the button on its panel or insert the machine through optical network and carry the comprehensive accuse and realize remote configuration, the controller panel disposes 5 inches OLED display screens, can real-time display system operating condition, system operating condition conveys to the machine through the network and carries the comprehensive accuse, controller inside core processor chip adopts the STM32H743Z1 type treater of ARM framework, the controller sends the report information of local prestoring to the modulator or to the modulator retransmission machine carries the comprehensive accuse editor's report information, report information is digital signal.
The first exciter and the second exciter carry out frequency modulation processing on broadcast information input by the controller, modulated radio frequency signals are output to the first power amplifier and the second power amplifier respectively, and a digital-to-analog conversion circuit mainly comprising a chip AD9773 is adopted in the first exciter and the second exciter to carry out digital-to-analog conversion for receiving digital broadcast information.
The maximum output power of the first power amplifier and the second power amplifier is higher than 2 kilowatts through power amplification and power synthesis.
The switcher sends a starting instruction to a corresponding power amplifier according to a received channel selection instruction, sends the channel selection instruction to the filter switch component, sends a filtering frequency band selection instruction to the filtering switch component according to a transmitting frequency point, gates a filtering channel of a corresponding frequency band, receives an output power coupling signal fed back by the filtering switch component, carries out sampling judgment on the signal, and actively closes the channel transmission and reports abnormal transmitting power information to the controller when the output power coupling signal exceeds or is lower than a threshold range set by a system.
The filtering switch component is internally composed of a plurality of groups of filters, a radio frequency switch and two directional couplers, segmented filtering is adopted, every 5MHz in the amplified filtering bandwidth of 360 MHz-470 MHz is divided into one segment, and each segment adopts different power references, so that the flatness of output power is ensured, and the filtering of signals in a desired frequency band is realized.
The first antenna and the second antenna radiate radio frequency signals to an external space, the first antenna and the second antenna adopt a knife-shaped monopole antenna, and the polarization mode is vertical polarization.
The invention has the following effects: the system works in an ultrashort wave frequency band, has larger transmitting power and wider working bandwidth, has the highest output power of 1 kilowatt, and has the wide-area effective coverage and local-range signal suppression capability of signals. Except the antenna, all units of the system are installed in the cabinet, and each unit adopts a modular design, so that the system has good interchangeability, a self-detection function and convenience in maintenance.
Drawings
Fig. 1 is a schematic diagram of the structure of the transmitting system of the present invention.
Description of the drawings: 1. the device comprises a controller, 2, a first exciter, 3, a first power amplifier power supply, 4, a first power amplifier, 5, a switcher, 6, a filtering switch component, 7, a second antenna, 8, a first antenna, 9, a second exciter, 10, a second power amplifier, 11 and a second power amplifier power supply.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides an airborne frequency modulation broadcast transmitting system, which transmits a frequency modulation signal carrying a specific audio program to a target area through a first antenna and a second antenna which are arranged on a machine body at a power of not less than 1000W, thereby realizing the purpose of covering information of the target area.
As shown in fig. 1, the power amplifier comprises a controller 1, a first exciter 2, a first power amplifier power supply 3, a first power amplifier 4, a switcher 5, a filter switch assembly 6, a second antenna 7, a first antenna 8, a second exciter 9, a second power amplifier 10, and a second power amplifier power supply 11, wherein the controller output end is connected with the input ends of the first exciter, the switcher, and the second exciter respectively, the first exciter output end is connected with the first power amplifier input end, the switcher output end is connected with the first power amplifier, the second power amplifier, and the filter switch assembly input end, the second exciter output end is connected with the second power amplifier output end, the filter switch assembly output end is connected with the first antenna, and the second antenna input end, the first power amplifier input end is connected with the first power amplifier power supply output end, and the input end of the second power amplifier is connected with the output end of the second power amplifier power supply.
This broadcast transmitting system is except first antenna, second antenna, controller, first exciter, first power amplifier power, first power amplifier, switch, filtering switch subassembly, second exciter, second power amplifier are installed in the rack, provide the power by distribution device, convert the airborne 28V DC power supply of input into the power that work needs, and operating frequency is 360MHz ~470 MHz. The liquid cooling pipeline and the power distribution device are arranged in the two side faces of the cabinet, and the liquid cooling pipeline is arranged at the bottom layer of the cabinet, so that efficient heat dissipation of the system is achieved. And the cabinet adopts a 42U standard cabinet, and the depth is 800 mm.
The power distribution device respectively converts and outputs the following power sources according to the input +28V airborne direct current: one path of isolated +28V power supply is connected to a first power amplifier power supply; one path of isolated +28V power supply is connected to the second power amplifier power supply, and the other path of isolated +5V power supply is connected to the filter switch component; an isolated +28V to switch, a first actuator, a second actuator and a controller. The design can effectively ensure that the power supply of the power amplifier cannot cause interference to the power supplies of other parts of the system.
The controller can carry out local configuration on the system through keys on a panel of the controller, and can also access airborne integrated control through a fiber network to realize remote configuration. The controller panel is provided with a 5-inch OLED display screen, the working state of the system can be displayed in real time, the working state of the system can also be transmitted to the airborne comprehensive control through a network, and an STM32H743Z1 type processor of an ARM framework is adopted as a core processor chip in the controller. The controller can send the broadcast information of local prestoring to the modulator, also can forward the broadcast information of machine-carried comprehensive control editor to the modulator, broadcast information and be digital signal.
The first exciter and the second exciter carry out frequency modulation processing on broadcast information input by the controller, modulated radio frequency signals are output to the first power amplifier and the second power amplifier respectively, and a digital-to-analog conversion circuit mainly comprising a chip AD9773 is adopted in the first exciter and the second exciter to carry out digital-to-analog conversion for receiving digital broadcast information.
The maximum output power of the first power amplifier and the second power amplifier is higher than 2 kilowatts through power amplification and power synthesis.
The switcher switches send a starting instruction to the corresponding power amplifiers according to the received channel selection instruction, and send the channel selection instruction to the filter switch component. And sending a filtering frequency band selection instruction to the filtering switch component according to the transmitting frequency point, and gating a filtering channel of a corresponding frequency band. The switch receives the output power coupling signal fed back by the filter switch component, carries out sampling judgment on the signal, and can actively close the channel for transmitting when the output power coupling signal exceeds or is lower than a threshold range set by a system, and reports abnormal information of the transmitting power to the controller.
The filtering switch component is internally composed of a plurality of groups of filters, a radio frequency switch and two directional couplers, segmented filtering is adopted, every 5MHz in the amplified filtering bandwidth of 360 MHz-470 MHz is divided into one segment, and each segment adopts different power references, so that the flatness of output power is ensured, and the filtering of signals in a desired frequency band is realized.
The first antenna and the second antenna radiate radio frequency signals to an external space, the first antenna and the second antenna adopt a knife-shaped monopole antenna, and the polarization mode is vertical polarization.
The first exciter, the same power amplifier power supply and the same antenna form a double transmitting channel which is mutually backup.
This technical scheme provides an airborne frequency modulation broadcast transmitting system, contains: the power distribution device comprises a cabinet, a controller, a first exciter, a second exciter, a switcher, a first power amplifier, a second power amplifier, a filtering switch component, a first power amplifier power supply, a second power amplifier power supply, a power distribution device, a first antenna and a second antenna. The method is mainly applied to a broadcast transmitting system taking a large airplane as a carrier. The system works in an ultrashort wave frequency band, and has larger transmitting power and wider working bandwidth. The highest output power of the system is higher than 1 kilowatt, and wide-area effective coverage and local-area signal suppression of the transmitted signals are realized. Except the antenna, all units of the system are installed in the cabinet, and each unit adopts a modular design, so that the system has good interchangeability, a self-detection function and convenience in maintenance.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integral connections and can be communications between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Claims (8)
1. An airborne FM broadcast transmission system, characterized in that: comprises a controller, a first exciter, a first power amplifier power supply, a first power amplifier, a switcher, a filter switch component, a second antenna, a first antenna, a second exciter, a second power amplifier and a second power amplifier power supply, the output end of the controller is respectively connected with the input ends of the first exciter, the switcher and the second exciter, the output end of the first exciter is connected with the input end of the first power amplifier, the output end of the switcher is respectively connected with the input ends of the first power amplifier, the second power amplifier and the filtering switch component, the output end of the second exciter is connected with the output end of the second power amplifier, the output end of the filtering switch component is respectively connected with the input ends of the first antenna and the second antenna, the input end of the first power amplifier is connected with the output end of the first power amplifier power supply, and the input end of the second power amplifier is connected with the output end of the second power amplifier power supply.
2. An airborne fm broadcast transmission system according to claim 1 wherein: this broadcast transmitting system is except first antenna, second antenna, controller, first exciter, first power amplifier power, first power amplifier, switch, filter switch subassembly, second exciter, second power amplifier install in the rack, provide the power by distribution device, convert the airborne 28V DC power supply of input into the power that work needs, and operating frequency is 360MHz ~470MHz, the inside liquid cooling pipeline that is provided with of both sides face of rack, distribution device, the bottom of rack are provided with the liquid cooling pipeline, and the rack adopts rack 42U standard rack, and the degree of depth is 800 mm.
3. An airborne fm broadcast transmission system according to claim 1 wherein: the controller can carry out local configuration to the system through the button on its panel or insert the machine through optical network and carry the comprehensive accuse and realize remote configuration, the controller panel disposes 5 inches OLED display screens, can real-time display system operating condition, system operating condition conveys to the machine through the network and carries the comprehensive accuse, controller inside core processor chip adopts the STM32H743Z1 type treater of ARM framework, the controller sends the report information of local prestoring to the modulator or to the modulator retransmission machine carries the comprehensive accuse editor's report information, report information is digital signal.
4. An airborne fm broadcast transmission system according to claim 1 wherein: the first exciter and the second exciter carry out frequency modulation processing on broadcast information input by the controller, modulated radio frequency signals are output to the first power amplifier and the second power amplifier respectively, and a digital-to-analog conversion circuit mainly comprising a chip AD9773 is adopted in the first exciter and the second exciter to carry out digital-to-analog conversion for receiving digital broadcast information.
5. An airborne fm broadcast transmission system according to claim 1 wherein: the maximum output power of the first power amplifier and the second power amplifier is higher than 2 kilowatts through power amplification and power synthesis.
6. An airborne fm broadcast transmission system according to claim 1 wherein: the switcher sends a starting instruction to a corresponding power amplifier according to a received channel selection instruction, sends the channel selection instruction to the filter switch component, sends a filtering frequency band selection instruction to the filtering switch component according to a transmitting frequency point, gates a filtering channel of a corresponding frequency band, receives an output power coupling signal fed back by the filtering switch component, carries out sampling judgment on the signal, and actively closes the channel transmission and reports abnormal transmitting power information to the controller when the output power coupling signal exceeds or is lower than a threshold range set by a system.
7. An airborne fm broadcast transmission system according to claim 1 wherein: the filtering switch component is internally composed of a plurality of groups of filters, a radio frequency switch and two directional couplers, segmented filtering is adopted, every 5MHz in the amplified filtering bandwidth of 360 MHz-470 MHz is divided into one segment, and each segment adopts different power references, so that the flatness of output power is ensured, and the filtering of signals in a desired frequency band is realized.
8. An airborne fm broadcast transmission system according to claim 1 wherein: the first antenna and the second antenna radiate radio frequency signals to an external space, the first antenna and the second antenna adopt a knife-shaped monopole antenna, and the polarization mode is vertical polarization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911169958.2A CN110808802A (en) | 2019-11-26 | 2019-11-26 | Airborne frequency modulation broadcast transmitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911169958.2A CN110808802A (en) | 2019-11-26 | 2019-11-26 | Airborne frequency modulation broadcast transmitting system |
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| Publication Number | Publication Date |
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| CN110808802A true CN110808802A (en) | 2020-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911169958.2A Pending CN110808802A (en) | 2019-11-26 | 2019-11-26 | Airborne frequency modulation broadcast transmitting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113746490A (en) * | 2021-09-10 | 2021-12-03 | 维沃移动通信有限公司 | Radio frequency structure and electronic equipment |
| CN114389625A (en) * | 2020-10-19 | 2022-04-22 | 华为技术有限公司 | Transmission system, transmission signal switching method, medium, and user equipment |
-
2019
- 2019-11-26 CN CN201911169958.2A patent/CN110808802A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389625A (en) * | 2020-10-19 | 2022-04-22 | 华为技术有限公司 | Transmission system, transmission signal switching method, medium, and user equipment |
| CN114389625B (en) * | 2020-10-19 | 2023-06-27 | 华为技术有限公司 | Transmitting system, transmitting signal switching method, medium and user equipment |
| CN113746490A (en) * | 2021-09-10 | 2021-12-03 | 维沃移动通信有限公司 | Radio frequency structure and electronic equipment |
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