CN111446975A - Satellite-borne VHF frequency band transmitter - Google Patents
Satellite-borne VHF frequency band transmitter Download PDFInfo
- Publication number
- CN111446975A CN111446975A CN202010249393.5A CN202010249393A CN111446975A CN 111446975 A CN111446975 A CN 111446975A CN 202010249393 A CN202010249393 A CN 202010249393A CN 111446975 A CN111446975 A CN 111446975A
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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
-
- 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
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- 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
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a satellite-borne VHF frequency band transmitter which is used in a satellite very high frequency data exchange system and is used for up-converting a VDE modulation baseband signal in the satellite very high frequency data exchange system to a VHF frequency band and amplifying power. The transmitter adopts a primary up-conversion mode and comprises a crystal filter, a radio frequency amplifier, a sound meter filter, a power amplifier, a frequency mixer, a coupler, a wave detector, a booster, an isolator and the like. The power supply of the transmitter is +10V, and the +28V voltage required by the power amplifier for working and power supply is converted by the booster, so that the output power of the transmitter and the stability of the link gain can be improved. The input end of the transmitter is designed with a narrow-band crystal filter, so that the phase noise of a transmitting signal can be improved, and the influence on a VDES system receiver is reduced. The final stage of the transmitter is provided with a resistance parallel coupler and a detector, which can remotely measure and indicate the output power of the transmitter, and has the advantage of simplified design.
Description
Technical Field
The invention belongs to the field of satellite communication, and particularly relates to a satellite-borne VHF frequency band transmitter.
Background
At present, the VHF frequency band is mainly used in international maritime affairs, according to relevant regulations in radio rules modified by the international telecommunication union, the receiving and transmitting frequency range of a VDE system used by a satellite in an automatic ship identification system is 160 MHz-165 MHz, and VHF frequency band transmitters are generally designed in the VDE system. The VHF frequency range transmitter is used for converting the VDE system modulation signal into the VHF frequency range and performing power amplification output.
The satellite-borne VHF frequency band transmitters disclosed and reported at present mostly adopt a direct amplification mode. The method has the defects that amplification gains of all stages cannot be flexibly adjusted, the gains are stable and easy to self-excite, stray and phase noise indexes of the output end of a transmitter cannot be effectively improved, and the method is large in size. On the other hand, the frequency band satellite-borne transmitter has lower working voltage, cannot output larger power and has lower conversion efficiency.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention discloses a satellite-borne VHF frequency band transmitter. The technical scheme is as follows:
a satellite borne VHF band transmitter comprising at least:
a crystal filter: the system is used for receiving and filtering out the out-of-band spurious of the input baseband signal, improving the signal spectrum purity and the phase noise, and sending the processed input baseband signal to the intermediate frequency amplifier;
an intermediate frequency amplifier: the mixer is used for carrying out power amplification on the input baseband signal to obtain an intermediate frequency signal and sending the intermediate frequency signal to the mixer;
a mixer: the up-conversion circuit is used for up-converting the sent intermediate frequency signal into a radio frequency signal and sending the radio frequency signal to a radio frequency amplifier;
a radio frequency amplifier: the device is used for amplifying the power of the sent radio frequency signal and sending the amplified radio frequency signal to the sound meter filter;
acoustic surface filter: the system comprises a power amplifier, a radio frequency link stray and out-of-band signal used for filtering an input radio frequency signal to obtain a final stage radio frequency signal, and the final stage radio frequency signal is input into the power amplifier;
a power amplifier: the coupler is used for amplifying the power of the fed final-stage radio frequency signal and feeding the final-stage radio frequency signal into the coupler;
a coupler: the signal processing circuit is used for outputting signals sent into the signal processing circuit in two paths, wherein one path is a main signal, and the other path is an auxiliary signal; wherein:
the main signal is sent to an isolator; the secondary signal is fed to a detector;
an isolator: the device is used for receiving the main signal, ensuring the unidirectional output of the main signal input into the device and improving the standing wave of the output port of the transmitter;
a detector: the DC amplifier is used for receiving the auxiliary signal, converting the input auxiliary signal into a DC voltage which is in direct proportion to the power of the auxiliary signal and sending the DC voltage to the DC amplifier;
a direct current amplifier: the direct current voltage signal processing circuit is used for receiving the direct current voltage sent by the detector and amplifying the voltage signal;
first power protection device: the power amplifier is used for respectively carrying out voltage protection on the intermediate frequency amplifier and the radio frequency amplifier, and can inhibit external transient high-voltage signals;
the second power supply protection device: the power amplifier is used for voltage protection, and external transient high-voltage signals can be restrained.
Optionally, the bandwidth of the crystal filter is 1.1 times of the bandwidth of the input baseband signal, and the center frequency of the crystal filter is consistent with the center frequency of the input baseband signal.
Optionally, the transmitter supply voltage is +10V, and the power amplifier supply voltage is + 28V.
Optionally, the transmitter further comprises: a voltage booster;
the booster converts the +10V voltage into a +28V voltage, and the +28V voltage is output to the power amplifier for power supply after passing through the second power supply protection device.
Optionally, the coupler is coupled in a manner that a resistor is connected in parallel to the transmitter output end and is directly coupled.
Optionally, the detection mode of the detector is square rate detection, and the magnitude of the output direct-current voltage of the detector is proportional to the magnitude of the output power of the power amplifier.
Optionally, the transmitter further comprises: a voltage stabilizer and a constant temperature crystal oscillator; the local oscillation signal required by the working of the frequency mixer is generated by a constant-temperature crystal oscillator, the power supply voltage of the constant-temperature crystal oscillator is +5V, and the +5V voltage is obtained by converting the input +10V voltage by a voltage stabilizer.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts a one-time up-conversion mode, can flexibly adjust the amplification gains of all levels, and has the advantages of stable gain, difficult self-excitation and the like.
The invention adopts the frequency mixer to realize the primary up-conversion mode, and the local oscillation signal of the frequency mixer is generated by the constant temperature crystal oscillator, thereby having the advantages of high frequency stability, low phase noise and the like.
The input end of the invention is designed with a crystal filter, which can greatly improve the stray and phase noise indexes of the output end of the transmitter.
The final stage of the transmitter is provided with the resistance coupler, and the transmitter has the advantage of miniaturization.
The transmitter of the invention adopts +10V for power supply, the +28V required by the work of the internal power amplifier is converted by the booster, the output signal amplitude of the power amplifier can be effectively improved, the output power is improved, and the power supply of all active devices is designed with power supply protection or voltage stabilization isolation, thereby improving the reliability of the transmitter.
The final stage of the transmitter is provided with a coupler and a detector, the coupler is coupled in a way that a resistor is connected in parallel to the output end of the transmitter for direct coupling, and the transmitter has the advantage of simple design.
The final stage of the transmitter is provided with a coupler and a detector, and the detector adopts a square rate detection mode and can remotely measure and indicate the output power of the transmitter.
The transmitter output end of the invention is provided with the isolator, which can improve the port matching capability and the output power telemetering stability.
Drawings
Fig. 1 is a block diagram of a structure of a satellite-borne VHF band transmitter according to an embodiment of the present invention.
Detailed Description
The present invention will be described in more detail below with reference to the accompanying drawings, which illustrate embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.
As shown in fig. 1, the present embodiment discloses a satellite-borne VHF band transmitter, which is used in a satellite VHF Data Exchange System (VDES), and is used for up-converting a VDE modulated baseband signal in the satellite VHF Data Exchange System to a VHF band and performing power amplification. The transmitter at least comprises the following modules:
a crystal filter: the system is used for receiving and filtering out the out-of-band spurious of the input baseband signal, improving the signal spectrum purity and the phase noise, and sending the processed input baseband signal to the intermediate frequency amplifier;
an intermediate frequency amplifier: the mixer is used for carrying out power amplification on the input baseband signal to obtain an intermediate frequency signal and sending the intermediate frequency signal to the mixer;
a mixer: the up-conversion circuit is used for up-converting the sent intermediate frequency signal into a radio frequency signal and sending the radio frequency signal to a radio frequency amplifier;
a radio frequency amplifier: the device is used for amplifying the power of the sent radio frequency signal and sending the amplified radio frequency signal to the sound meter filter;
acoustic surface filter: the system comprises a power amplifier, a radio frequency link stray and out-of-band signal used for filtering an input radio frequency signal to obtain a final stage radio frequency signal, and the final stage radio frequency signal is input into the power amplifier;
a power amplifier: the coupler is used for amplifying the power of the fed final-stage radio frequency signal and feeding the final-stage radio frequency signal into the coupler;
a coupler: the signal processing circuit is used for outputting signals sent into the signal processing circuit in two paths, wherein one path is a main signal, and the other path is an auxiliary signal; wherein: the main signal is sent to an isolator; the secondary signal is fed to a detector;
an isolator: the device is used for receiving the main signal, ensuring the unidirectional output of the main signal input into the device and improving the standing wave of the output port of the transmitter; the VHF frequency band isolator is designed at the output end of the transmitter so as to improve the matching capability and the detection voltage stability of the transmitter.
A detector: the DC amplifier is used for receiving the auxiliary signal, converting the input auxiliary signal into a DC voltage which is in direct proportion to the power of the auxiliary signal and sending the DC voltage to the DC amplifier;
a direct current amplifier: the direct current voltage signal processing circuit is used for receiving the direct current voltage sent by the detector and amplifying the voltage signal;
first power protection device: the power amplifier is used for respectively carrying out voltage protection on the intermediate frequency amplifier and the radio frequency amplifier, and can inhibit external transient high-voltage signals;
the second power supply protection device: the power amplifier is used for voltage protection, and external transient high-voltage signals can be restrained.
The transmitter further includes: a voltage stabilizer and a constant temperature crystal oscillator; the local oscillation signal required by the operation of the frequency mixer is generated by a constant temperature crystal oscillator, and the frequency mixer has the characteristic of high frequency stability.
In this embodiment, the baseband signal frequency is about 15MHz, the local oscillator signal frequency is about 145MHz, and the constant temperature crystal oscillator is powered by +5V, which is obtained from +10V through the voltage stabilizer.
The bandwidth of the crystal filter is 1.1 times of the bandwidth of the input baseband signal, and the center frequency of the crystal filter is consistent with the center frequency of the input baseband signal.
The power amplifier is connected with the transmitter, wherein the power supply voltage of the transmitter is +10V, and the power supply voltage of the power amplifier is + 28V.
The transmitter further includes: a voltage booster;
the booster converts the +10V input voltage into +28V voltage, and the +28V voltage is output to the power amplifier for power supply after passing through the second power supply protection device.
In this embodiment, the first power protection device and the second power protection device are both composed of transient suppression diodes. This is by way of example only and the invention is not so limited.
The power amplifier is a core device in this embodiment, and in this embodiment, a field effect transistor MRF134 of MACOM corporation is selected, the conversion efficiency is higher than 55%, and the output power is higher than 5W.
The coupler is coupled in a manner that a resistor is connected in parallel to the output end of the transmitter and is directly coupled. In this embodiment, the parallel resistor is 2k Ω, and the loss of the main path signal is not affected.
The detection mode of the detector is square rate detection, and the output direct-current voltage of the detector is in direct proportion to the output power of the power amplifier. The detector can perform telemetering indication on the output power of the transmitter, and a direct current amplifier is designed to amplify the output voltage of the detector to a required telemetering range.
In summary, the present invention adopts a one-time up-conversion mode, can flexibly adjust the amplification gains of each stage, has the advantages of stable gain, uneasy self-excitation, etc., and can greatly improve the stray and phase noise indexes of the output end of the transmitter due to the design of the crystal filter at the input end. The final stage of the transmitter is provided with a resistance coupler, and the transmitter has the advantage of miniaturization. The transmitter adopts +10V for power supply, the +28V required by the work of the internal power amplifier is converted by the booster, the output signal amplitude of the power amplifier can be effectively improved, and power supply protection or voltage stabilization isolation is designed for the power supply of all active devices so as to improve the reliability of the transmitter.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (7)
1. A satellite-borne VHF band transmitter, comprising at least:
a crystal filter: the system is used for receiving and filtering out the out-of-band spurious of the input baseband signal, improving the signal spectrum purity and the phase noise, and sending the processed input baseband signal to the intermediate frequency amplifier;
an intermediate frequency amplifier: the mixer is used for carrying out power amplification on the input baseband signal to obtain an intermediate frequency signal and sending the intermediate frequency signal to the mixer;
a mixer: the up-conversion circuit is used for up-converting the sent intermediate frequency signal into a radio frequency signal and sending the radio frequency signal to a radio frequency amplifier;
a radio frequency amplifier: the device is used for amplifying the power of the sent radio frequency signal and sending the amplified radio frequency signal to the sound meter filter;
acoustic surface filter: the system comprises a power amplifier, a radio frequency link stray and out-of-band signal used for filtering an input radio frequency signal to obtain a final stage radio frequency signal, and the final stage radio frequency signal is input into the power amplifier;
a power amplifier: the coupler is used for amplifying the power of the fed final-stage radio frequency signal and feeding the final-stage radio frequency signal into the coupler;
a coupler: the signal processing circuit is used for outputting signals sent into the signal processing circuit in two paths, wherein one path is a main signal, and the other path is an auxiliary signal; wherein: the main signal is sent to an isolator; the secondary signal is fed to a detector;
an isolator: the device is used for receiving the main signal, ensuring the unidirectional output of the main signal input into the device and improving the standing wave of the output port of the transmitter;
a detector: the DC amplifier is used for receiving the auxiliary signal, converting the input auxiliary signal into a DC voltage which is in direct proportion to the power of the auxiliary signal and sending the DC voltage to the DC amplifier;
a direct current amplifier: the direct current voltage signal processing circuit is used for receiving the direct current voltage sent by the detector and amplifying the voltage signal;
first power protection device: the power amplifier is used for respectively carrying out voltage protection on the intermediate frequency amplifier and the radio frequency amplifier, and can inhibit external transient high-voltage signals;
the second power supply protection device: the power amplifier is used for voltage protection, and external transient high-voltage signals can be restrained.
2. The satellite-borne VHF band transmitter according to claim 1, wherein the crystal filter has a bandwidth 1.1 times a bandwidth of the input baseband signal, and a center frequency of the crystal filter coincides with a center frequency of the input baseband signal.
3. The satellite-borne VHF band transmitter according to claim 1, wherein the transmitter supply voltage is +10V and the power amplifier supply voltage is + 28V.
4. A satellite-borne VHF band transmitter according to claim 3, further comprising: a voltage booster;
the booster converts the +10V voltage into a +28V voltage, and the +28V voltage is output to the power amplifier for power supply after passing through the second power supply protection device.
5. The VHF band transmitter of claim 1, wherein the coupler is coupled by connecting a resistor in parallel to the transmitter output.
6. The vehicle-mounted VHF band transmitter according to claim 1, wherein the detector detects square-rate detection, and the magnitude of the output DC voltage of the detector is proportional to the magnitude of the output power of the power amplifier.
7. The satellite-borne VHF band transmitter according to claim 1, further comprising: a voltage stabilizer and a constant temperature crystal oscillator; the local oscillation signal required by the working of the frequency mixer is generated by a constant-temperature crystal oscillator, the power supply voltage of the constant-temperature crystal oscillator is +5V, and the +5V voltage is obtained by converting the input +10V voltage by a voltage stabilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010249393.5A CN111446975A (en) | 2020-04-01 | 2020-04-01 | Satellite-borne VHF frequency band transmitter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010249393.5A CN111446975A (en) | 2020-04-01 | 2020-04-01 | Satellite-borne VHF frequency band transmitter |
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| Publication Number | Publication Date |
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| CN111446975A true CN111446975A (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010249393.5A Pending CN111446975A (en) | 2020-04-01 | 2020-04-01 | Satellite-borne VHF frequency band transmitter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114288A (en) * | 2021-05-21 | 2021-07-13 | 中国电子科技集团公司第二十九研究所 | High-power transmitter power trap method and trap assembly |
| CN113872622A (en) * | 2021-10-15 | 2021-12-31 | 上海航天测控通信研究所 | Variable frequency point satellite measurement and control transmitter |
| US11621737B2 (en) | 2021-06-01 | 2023-04-04 | Rockwell Collins, Inc. | Architecture for wideband receiver module with acoustic filter array |
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| CN103281114A (en) * | 2013-05-15 | 2013-09-04 | 浙江大学 | Device and method for processing signals of pico-satellite transmitters |
| CN103501204A (en) * | 2013-10-08 | 2014-01-08 | 上海航天测控通信研究所 | X-waveband output power telemetry collecting device |
| US9444336B2 (en) * | 2014-04-01 | 2016-09-13 | Rohm Co., Ltd. | Switching regulator |
| CN108736904A (en) * | 2017-04-17 | 2018-11-02 | 东莞百电子有限公司 | A kind of novel VSAT receivers and transmitter |
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2020
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Patent Citations (5)
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| JP2007532028A (en) * | 2003-07-15 | 2007-11-08 | アドバンスド エナジー インダストリーズ， インコーポレイテッド | Improved RF power control device for RF plasma application |
| CN103281114A (en) * | 2013-05-15 | 2013-09-04 | 浙江大学 | Device and method for processing signals of pico-satellite transmitters |
| CN103501204A (en) * | 2013-10-08 | 2014-01-08 | 上海航天测控通信研究所 | X-waveband output power telemetry collecting device |
| US9444336B2 (en) * | 2014-04-01 | 2016-09-13 | Rohm Co., Ltd. | Switching regulator |
| CN108736904A (en) * | 2017-04-17 | 2018-11-02 | 东莞百电子有限公司 | A kind of novel VSAT receivers and transmitter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114288A (en) * | 2021-05-21 | 2021-07-13 | 中国电子科技集团公司第二十九研究所 | High-power transmitter power trap method and trap assembly |
| US11621737B2 (en) | 2021-06-01 | 2023-04-04 | Rockwell Collins, Inc. | Architecture for wideband receiver module with acoustic filter array |
| CN113872622A (en) * | 2021-10-15 | 2021-12-31 | 上海航天测控通信研究所 | Variable frequency point satellite measurement and control transmitter |
| CN113872622B (en) * | 2021-10-15 | 2022-05-27 | 上海航天测控通信研究所 | Variable frequency point satellite measurement and control transmitter |
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