CN111404596B - Satellite downlink high-frequency head controller - Google Patents
Satellite downlink high-frequency head controller Download PDFInfo
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- CN111404596B CN111404596B CN202010226345.4A CN202010226345A CN111404596B CN 111404596 B CN111404596 B CN 111404596B CN 202010226345 A CN202010226345 A CN 202010226345A CN 111404596 B CN111404596 B CN 111404596B
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- satellite downlink
- conversion module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The invention relates to the technical field of satellite communication, in particular to a satellite downlink high-frequency head controller, which comprises an MCU (microprogrammed control unit), an external DC (direct current), a modem, a DC-DC module, a controllable DC-DC conversion module and a 22KHZ communication module; the external DC and the DC of the modem are respectively connected with a rectifier diode and then connected with the MCU through the DC-DC conversion module and the controllable DC-DC conversion module, the MCU is respectively connected with a user serial port, the controllable DC-DC conversion module and the 22KHZ communication module, the LNB converts the frequency of the received signals into L-waveband signals, the L-waveband signals are filtered and extracted through C9 and HF2, then enter a variable amplifier consisting of AMP and ATT, and then are input into the modem through HF1 and C10. The device provided by the invention can realize multi-mode control of free switching of LNB local oscillators and can make up for cable insertion loss.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a satellite downlink high-frequency head controller.
Background
In recent years, the development of satellite emergency communication is rapid, with the popularization of satellite communication of marine fishing boats in remote mountainous areas, islands and offshore fishing lands, the frequency band of satellite communication is also expanded to a KA (KA) band, the frequency band is wider, the speed is higher, so that the satellite communication ground station is also developed, the performance of the ground station and each unit inside the ground station and the component assembly is also improved, and the satellite emergency communication system is developed towards modularization and intellectualization. At present, a satellite communication downlink tuner (hereinafter referred to as a satellite downlink tuner LNB) on the market is mainly characterized in that a C wave band is converted into an L wave band, a KU wave band is converted into an L wave band, the local oscillation frequency of the KU wave band satellite downlink tuner LNB is mainly 3, 9.75G, 10.6G and 11.3G, and the intermediate frequency output frequency is 950-2150 MHz because the KU wave band frequency is wider (10.75G-12.75G) and the use occasion and the unit are different, otherwise, the local oscillation frequency hopping switching is required to be realized by using one satellite downlink tuner LNB, and the cost and the trouble are increased because different satellite downlink tuners LNBs are required to be replaced; the Ka wave band frequency band is wider, the local oscillator frequency needing to be switched is more, manufacturers for producing the satellite downlink tuner LNB are different, the requirements of users are different, the local oscillator is switched by changing the input voltage according to some requirements, and the selection and the use of a system integration manufacturer and some users with small use amount are inconvenient because some users need to realize the switching through a 22KHZ communication module. The invention solves the problems of compatibility and inconvenience in use, and saves system space and manufacturing cost for users.
Disclosure of Invention
The invention aims to solve the technical problem of providing a satellite downlink high-frequency head controller capable of realizing multi-mode control of local oscillation switching of a satellite downlink high-frequency head LNB.
The invention is realized by the following technical scheme:
the satellite downlink high-frequency head controller comprises a Micro Control Unit (MCU), an external direct-current power supply DC, a modem, a DC-DC direct-current power supply conversion module, a controllable DC-DC direct-current power supply conversion module and a 22KHZ communication module;
the external direct-current power supply DC and the DC of the modem are respectively connected with the rectifier diode and then connected with the micro-control unit MCU through the DC-DC direct-current power supply conversion module and the controllable DC-DC direct-current power supply conversion module to supply power for the micro-control unit MCU and other units of the controller;
the micro control unit MCU is respectively connected with the user serial port, the controllable DC-DC direct current power supply conversion module and the 22KHZ communication module,
when the micro control unit MCU receives an instruction through a user serial port to change an output voltage value, the controllable DC-DC power supply conversion module is controlled to change the output voltage value and then is transmitted to the satellite downlink tuner LNB through the first DC low-pass filter, and the satellite downlink tuner LNB switches local oscillators with different frequencies according to different received voltages;
when the satellite downlink high-frequency head LNB needs to be controlled by the 22KHZ signal, the micro control unit MCU sends an instruction to the 22KHZ communication module, the 22KHZ communication module converts the digital signal into a modulation signal with the frequency of 22KHZ, the modulation signal is filtered by the 22K band-pass filter BF2, C5 and L5, and then the modulation signal is combined with the variable DC voltage signal output by the first direct-current low-pass filter and the 10M reference signal sent by the modem and input into the satellite downlink high-frequency head LNB after being processed by the 10M processing circuit;
the satellite downlink tuner LNB converts the received signal into an L-band signal, filters and extracts the L-band signal through the C9 and the high-pass filter HF2, then enters the variable amplifier composed of the microwave amplifier AMP and the controllable attenuator ATT, amplifies the L-band signal, and then inputs the L-band signal into the modem through the high-pass filters HF1 and C10;
further, the satellite downlink high-frequency head controller also comprises a voltage detection module, wherein the voltage detection module is connected between the first direct current low-pass filter and the controllable DC-DC direct current power supply conversion module and is connected with the micro control unit MCU and used for verifying whether the voltage output by the controllable DC-DC direct current power supply conversion module is the voltage required by the satellite downlink high-frequency head LNB, and if the voltage output by the controllable DC-DC direct current power supply conversion module is not the voltage required by the satellite downlink high-frequency head LNB, the micro control unit MCU is informed to control the controllable DC-DC direct current power supply conversion module to change the output voltage.
Furthermore, a second direct current low-pass filter is connected between the modem and the corresponding rectifying diode, and the second direct current low-pass filter is formed by combining and connecting an inductor L1, a capacitor C1, an inductor L2 and a capacitor C2.
Furthermore, the first dc low-pass filter is formed by connecting an inductor L3, a capacitor C3, an inductor L4, and a capacitor C4 in combination.
Further, the 10M processing circuit includes an inductor L7, a capacitor C7, a band pass filter BF1, a capacitor C8, a capacitor C6, and an inductor L6, which are connected in sequence.
Advantageous effects of the invention
The satellite downlink high-frequency head controller protected by the invention has the following advantages:
1) the problem of compatible satellite downlink tuner LNB frequency hopping control mode is solved, local oscillator frequency can be controlled by changing input voltage, and 22KHZ communication control mode can also be adopted.
2. And the gain of the L-band signal is controlled to make up for the insertion loss of the cable.
3. The self-made branch (close) circuit of power DC, 22KHZ, 10M and L wave bands realizes the local oscillation switching of the satellite downlink tuner LNB controlled by multiple modes.
Drawings
FIG. 1 is a hardware schematic block diagram of the present invention;
FIG. 2 is a block diagram of the control flow of the present invention;
Detailed Description
The satellite downlink high-frequency head controller comprises a Micro Control Unit (MCU), an external direct-current power supply DC, a modem, a DC-DC direct-current power supply conversion module, a controllable DC-DC direct-current power supply conversion module and a 22KHZ communication module;
the external direct-current power supply DC and the DC of the modem are respectively connected with the rectifier diode and then connected with the micro-control unit MCU through the DC-DC direct-current power supply conversion module and the controllable DC-DC direct-current power supply conversion module to supply power for the micro-control unit MCU and other units of the controller; the two rectifier diodes D1 and D2 are used for preventing the DC from the modem and the DC of an external direct current power supply from being isolated from each other, the DC input of the modem can enable the equipment to work, the DC input of the external direct current power supply can enable the equipment to work, the two rectifier diodes can be simultaneously input into the equipment to work normally, and the modem and the external direct current power supply cannot be damaged due to conflict;
the micro control unit MCU is respectively connected with the user serial port, the controllable DC-DC direct current power supply conversion module and the 22KHZ communication module,
when the micro control unit MCU receives an instruction through a user serial port to change an output voltage value, the controllable DC-DC power supply conversion module is controlled to change the output voltage value and then is transmitted to the satellite downlink tuner LNB through the first DC low-pass filter, and the satellite downlink tuner LNB switches local oscillators with different frequencies according to different received voltages; the micro control unit MCU is powered on to output 15V by default (because the voltage of the satellite downlink tuner LNB is generally 13-24V), and the output voltage value can be changed according to the instruction when the micro control unit MCU receives a user instruction.
When a satellite downlink high-frequency head LNB which needs to be controlled by a 22KHZ signal is required, a command is sent to a 22KHZ communication module through a micro control unit MCU, the 22KHZ communication module converts a digital signal into a modulation signal with the frequency of 22KHZ, the modulation signal is filtered by a 22KHZ band-pass filter BF2, a capacitor C5 and an inductor L5, and then the modulation signal, a variable DC voltage signal output by a first direct current low-pass filter and a 10M reference signal sent by a modem are processed by a 10M processing circuit and then are combined and input into the satellite downlink high-frequency head LNB; the problem of the LNB frequency hopping control mode of the compatible satellite downlink tuner is solved, the local oscillation frequency can be controlled by changing the input voltage, the local oscillation frequency can also be controlled by 22KHZ communication, and the circuits can be freely separated and combined.
The satellite downlink tuner LNB converts the received signal into an L-band signal, filters and extracts the L-band signal through the capacitor C9 and the high-pass filter HF2, then enters the variable amplifier composed of the microwave amplifier AMP and the controllable attenuator ATT, amplifies the L-band signal, and then enters the modem through the high-pass filter HF1 and the capacitor C10; the gain of the L-band signal can be controlled to make up for the insertion loss of the cable.
Further, the satellite downlink high-frequency head controller also comprises a voltage detection module, wherein the voltage detection module is connected between the direct current low-pass filter and the controllable DC-DC power supply conversion module and is connected with the micro control unit MCU and used for verifying whether the voltage output by the controllable DC-DC power supply conversion module is the voltage required by the satellite downlink high-frequency head LNB, if the voltage output by the controllable DC-DC power supply conversion module is not the voltage required by the satellite downlink high-frequency head LNB, the micro control unit MCU is informed to control the controllable DC-DC power supply conversion module to change the output voltage, so that the voltage output by the controllable DC-DC power supply conversion module can be ensured to be always within the voltage range required by the satellite downlink high-frequency head LNB, and the equipment damage or the equipment working abnormity can be prevented.
Furthermore, a second direct current low-pass filter is connected between the modem and the corresponding rectifying diode, and the second direct current low-pass filter is formed by combining and connecting an inductor L1, a capacitor C1, an inductor L2 and a capacitor C2, wherein inductance values and capacitance values of L1 and C1 are small, inductance values and capacitance values of L2 and C2 are large, and filtering extraction can be performed on a DC signal output by the modem, so that a 10M reference signal and an L-band signal are isolated and suppressed.
Furthermore, the first dc low-pass filter is formed by combining and connecting an inductor L3, a capacitor C3, an inductor L4 and a capacitor C4, wherein the inductance and capacitance values of L3 and C3 are small, and the inductance and capacitance values of L4 and C4 are large, so that the distribution parameters of the large inductor and capacitor can be effectively prevented from generating resonance on the L-band signal by adopting a step filtering mode, and the signal absorption on a certain frequency end is caused.
Further, the 10M processing circuit includes an inductor L7, a capacitor C7, a band-pass filter BF1, a capacitor C8, a capacitor C6, and an inductor L6, which are connected in sequence, wherein inductance values and capacitance values of C7, L7, C6, and L6 are small, so that it is effectively prevented that the distribution parameters of the large inductor and capacitor resonate L-band signals to absorb signals at a certain frequency end, and thus it is possible to realize a combining and splitting circuit in which low-frequency signals and high-frequency signals are not affected.
The satellite downlink high-frequency head controller protected by the invention solves the problem of compatibility with an LNB frequency hopping control mode of a satellite downlink high-frequency head, can control the local oscillation frequency by changing the input voltage, and can also be realized by adopting a 22KHZ communication control mode; the gain of the L-band signal is controlled, so that the insertion loss of the cable can be compensated; meanwhile, the self-made branch (combination) circuit of the power supply DC, 22KHZ, 10M and L wave band realizes multi-mode control of local oscillator switching of the satellite downlink tuner LNB, can effectively prevent resonance generated by distribution parameters of a large inductance capacitor on L wave band signals from absorbing signals of a certain frequency end, and then enables free combination and branch of low-frequency signals and high-frequency signals without influence.
The satellite downlink high-frequency head controller protected by the invention can realize multi-mode control of free switching of LNB local oscillators of the satellite downlink high-frequency head, and can make up for cable insertion loss.
In summary, the satellite downlink high-frequency head controller protected by the invention can realize automatic conversion of internal and external reference signals to achieve synchronous communication and solve the problem of multi-frequency band and multi-local oscillator.
Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The satellite downlink high-frequency head controller is characterized by comprising a micro control unit MCU, an external direct-current power supply DC, a modem, a DC-DC direct-current power supply conversion module, a controllable DC-DC direct-current power supply conversion module and a 22KHZ communication module;
the direct current power supply DC externally connected with the direct current power supply DC and the modulator-demodulator is respectively connected with the rectifier diode and then connected with the micro control unit MCU through the DC-DC direct current power supply conversion module and the controllable DC-DC direct current power supply conversion module to supply power for the micro control unit MCU and other units of the controller;
when the micro control unit MCU receives an instruction through the user serial port to change an output voltage value, the controllable DC-DC direct-current power supply conversion module is controlled to change the output voltage value and then the output voltage value is transmitted to the satellite downlink tuner LNB through the first direct-current low-pass filter, and the satellite downlink tuner LNB switches local oscillators with different frequencies according to different received voltages; when a satellite downlink high-frequency head LNB which needs to be controlled by a 22KHZ signal is required, a command is sent to a 22KHZ communication module through a micro control unit MCU, the 22KHZ communication module converts a digital signal into a modulation signal with the frequency of 22KHZ, the modulation signal is filtered by a 22KHZ band-pass filter BF2, a capacitor C5 and an inductor L5, and then the modulation signal, a variable DC voltage signal output by a first direct current low-pass filter and a 10M reference signal sent by a modem are processed by a 10M processing circuit and then are combined and input into the satellite downlink high-frequency head LNB;
the satellite downlink tuner LNB converts the received signal into an L-band signal, filters and extracts the L-band signal through the capacitor C9 and the high-pass filter HF2, then enters the variable amplifier composed of the microwave amplifier AMP and the controllable attenuator ATT, amplifies the L-band signal, and then enters the modem through the high-pass filter HF1 and the capacitor C10;
2. the satellite downlink high-frequency head controller according to claim 1, further comprising a voltage detection module, connected between the DC low-pass filter and the controllable DC-DC power conversion module, and connected to the micro control unit MCU, for verifying whether the voltage output by the controllable DC-DC power conversion module is the voltage required by the satellite downlink high-frequency head LNB, and if the voltage output by the controllable DC-DC power conversion module is not the voltage required by the satellite downlink high-frequency head LNB, notifying the micro control unit MCU to control the controllable DC-DC power conversion module to change the output voltage.
3. The satellite downlink high-frequency head controller according to claim 1, wherein a second dc low-pass filter is connected between the modem and the corresponding rectifying diode, and the second dc low-pass filter is formed by combining and connecting an inductor L1, a capacitor C1, an inductor L2 and a capacitor C2.
4. The satellite downlink high-frequency head controller according to claim 1, wherein the first dc low-pass filter is formed by connecting an inductor L3, a capacitor C3, an inductor L4 and a capacitor C4 in combination.
5. The satellite downlink high-frequency head controller according to claim 1, wherein the 10M processing circuit comprises an inductor L7, a capacitor C7, a band-pass filter BF1, a capacitor C8, a capacitor C6 and an inductor L6 which are connected in sequence.
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| CN202010226345.4A CN111404596B (en) | 2020-03-27 | 2020-03-27 | Satellite downlink high-frequency head controller |
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| CN202010226345.4A CN111404596B (en) | 2020-03-27 | 2020-03-27 | Satellite downlink high-frequency head controller |
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| CN111404596B true CN111404596B (en) | 2022-01-28 |
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