CN108768500B - Communication satellite transponder - Google Patents
Communication satellite transponder Download PDFInfo
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- CN108768500B CN108768500B CN201810513258.XA CN201810513258A CN108768500B CN 108768500 B CN108768500 B CN 108768500B CN 201810513258 A CN201810513258 A CN 201810513258A CN 108768500 B CN108768500 B CN 108768500B
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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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Abstract
In an embodiment of the present application, a communication satellite repeater includes: the first conversion unit is used for carrying out frequency conversion processing on the Ka waveband signal based on the first local oscillation signal and the second local oscillation signal to obtain an intermediate frequency signal; the power division unit divides the intermediate frequency signals into a plurality of paths of intermediate frequency signals according to equal power; the plurality of second conversion units are used for processing the plurality of paths of intermediate frequency signals based on the third local oscillator signals and the fourth local oscillator signals to obtain Ku waveband signals; the channels adopted by each second conversion unit are different. The technical scheme is small in size and light in weight, the weight of the satellite can be reduced, and more use space is saved for the satellite.
Description
Technical Field
The present application relates to the field of satellite signal transmission, and more particularly, to a communication satellite transponder for a miniaturized communication satellite.
Background
The transponder is a main component of a communication satellite payload and is responsible for processing and amplifying communication signals received by the antenna, sending the communication signals back to the antenna and radiating the communication signals to the outside. The traditional communication satellite transponder mainly comprises an amplifier, an input multiplexer, a frequency mixer and the like, wherein the input multiplexer is mostly realized by adopting a waveguide cavity filter, so that the volume of the transponder is larger, the microwave circuit integration of the transponder is not facilitated, and when the number of channels is increased, the problem is more prominent.
Disclosure of Invention
The embodiment of the application provides a communication satellite transponder for a miniaturized communication satellite, and aims to solve the problems of large size and heavy weight of a traditional transponder.
In order to solve the above technical problem, the present application provides a communication satellite repeater, including:
the first conversion unit is used for carrying out frequency conversion processing on the Ka waveband signal based on the first local oscillation signal and the second local oscillation signal to obtain an intermediate frequency signal;
the power division unit divides the intermediate frequency signals into a plurality of paths of intermediate frequency signals according to equal power;
the plurality of second conversion units are used for processing the plurality of paths of intermediate frequency signals based on the third local oscillator signals and the fourth local oscillator signals to obtain Ku waveband signals;
the channels adopted by each second conversion unit are different.
Preferably, the first conversion unit includes:
the first frequency conversion module 24 is configured to amplify, filter and mix the Ka band signal based on the first local oscillator signal to obtain an L band signal;
and the second frequency conversion module 25 amplifies, filters and mixes the L-band signal based on a second local oscillation signal to obtain the intermediate frequency signal.
Preferably, the first frequency conversion module 24 includes: the low noise amplifier 1, the first filter 2 and the first mixer 3 are connected in sequence;
the input end of the low noise amplifier 1 is used as the input end of the first frequency conversion module 24; the output end of the first mixer 3 is used as the output end of the first frequency conversion module 24;
and the first frequency mixer 3 performs frequency mixing processing on the amplified and filtered Ka-band signal based on the first local oscillation signal to obtain an L-band signal.
Preferably, the second frequency conversion module 25 includes: the second filter 4, the first amplifier 5, the second mixer 6 and the second amplifier 7 are connected in sequence;
the input end of the second filter 4 is used as the input end of the second frequency conversion module 25; the output end of the second amplifier 7 is used as the output end of the second frequency conversion module 25;
the second mixer 6 processes the filtered and amplified L-band signal based on a second local oscillation signal, and obtains the intermediate frequency signal.
Preferably, the power dividing unit adopts a first power divider 8 with three outputs; each output terminal of the first power divider 8 is connected to a second conversion unit.
Preferably, the second conversion unit includes:
the third frequency conversion module 26 performs attenuation, filtering and frequency mixing processing on one path of intermediate frequency signal based on a third local oscillation signal to obtain an S-band signal;
and a fourth frequency conversion module 27, which performs filtering, amplification and frequency mixing processing on the S-band signal based on a fourth local oscillation signal to obtain a Ku-band signal.
Preferably, the third frequency conversion module 26 includes: the digital control attenuator 9, the acoustic surface filter 10 and the third mixer 11 are connected in sequence;
the input end of the numerical control attenuator 9 is used as the input end of the third frequency conversion module 26; the output end of the third mixer 11 is used as the output end of the third frequency conversion module 26;
the third mixer 11 performs frequency mixing processing on the intermediate frequency signal subjected to attenuation filtering based on the third local oscillation signal, so as to obtain an S-band signal.
Preferably, the center frequency of each of the acoustic surface filters 10 in the plurality of third frequency conversion units is different.
Preferably, the fourth frequency conversion module 27 includes: a third filter 12, a third amplifier 13, a fourth mixer 14 and an amplifier 15 connected in sequence;
an input terminal of the third filter 12 is used as an input terminal of a fourth frequency conversion module 27; the output end of the power amplifier 15 is used as the output end of the fourth frequency conversion module 27;
the fourth mixer 14 performs frequency mixing processing on the filtered and amplified S-band signal based on a fourth local oscillation signal, so as to obtain a Ku-band signal.
Preferably, the repeater further includes: the local oscillator signal generating module 28 generates a first local oscillator signal, a second local oscillator signal, a third local oscillator signal and a fourth local oscillator signal based on the crystal oscillator 16.
Preferably, the local oscillator signal generating module 28 includes: a crystal oscillator 16 and a second power divider 17 connected in sequence;
a first output end of the second power divider 17 is sequentially connected with a sampling phase-locked medium oscillation source PDRO18 and a first frequency multiplier 19, and outputs a first local oscillation signal through an output end of the first frequency multiplier 19;
a second output end of the second power divider 17 is connected to an integrated phase-locked frequency source PLS20, and a second local oscillator signal is output through an output end of the pulse generator;
a third output end of the second power divider 17 is sequentially connected to an integrated phase-locked frequency source PLS20 and a third power divider 21, and a third local oscillator signal is output through an output end of the third power divider 21;
a fourth output end of the second power divider 17 is sequentially connected to a second microwave assembly PDRO, a second frequency multiplier 22 and a fourth power divider 23, and a fourth local oscillator signal is output through an output end of the fourth power divider 23.
The invention has the following beneficial effects:
the technical scheme is small in size and light in weight, the weight of the satellite can be reduced, and more use space is saved for the satellite. The technical scheme of the application can ensure that the noise coefficient is less than 3dB and the gain is greater than 80 dB; the adjacent channel rejection ratio is greater than 35 dBc; the third-order intermodulation is greater than 30 dBc; the phase noise is less than-90 dBc/Hz @1 KHz; EVM (error vector magnitude) is less than 10%.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 shows a schematic diagram of a communication satellite transponder according to the present solution;
fig. 2 shows a schematic diagram of a local oscillator signal generating module according to the present embodiment.
Reference numerals
1. The low noise amplifier comprises a low noise amplifier, 2, a first filter, 3, a first mixer, 4, a second filter, 5, a first amplifier, 6, a second mixer, 7, a second amplifier, 8, a first power divider, 9, a numerical control attenuator, 10, a sound meter filter, 11, a third mixer, 12, a third filter, 13, a third amplifier, 14, a fourth mixer, 15, a power amplifier, 16, a crystal oscillator, 17, a second power divider, 18, a sampling phase-locked medium oscillation source PDRO, 19, a first frequency multiplier, 20, a phase-locked frequency source PLS, 21, a third power divider, 22, a second frequency multiplier, 23, a fourth power divider, 24, a first frequency conversion module, 25, a second frequency conversion module, 26, a third frequency conversion module, 27, a fourth frequency conversion module, 28 and a local oscillation signal generation module.
Detailed Description
In order to make the technical solutions and advantages of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments in the present description may be combined with each other without conflict.
The core thought of the scheme is that Ka waveband signals with an input bandwidth of 100MHz are down-converted to an intermediate frequency of 200-300 MHz, then frequency band division is completed by using a sound meter filter 10 with a high rectangular coefficient, the Ka waveband signals are divided into three sections of intermediate frequency signals with a bandwidth of 30MHz, and the intermediate frequency signals are up-converted and amplified to Ku waveband signals to be output.
As shown in fig. 1, a communication satellite repeater includes: the power division unit comprises a first conversion unit, a power division unit and a plurality of second conversion units. The first conversion unit carries out frequency conversion processing on the Ka waveband signal based on the first local oscillation signal and the second local oscillation signal to obtain an intermediate frequency signal; the power dividing unit divides the intermediate frequency signals into a plurality of paths of intermediate frequency signals according to equal power; and each path of intermediate frequency signal is processed through a second conversion unit based on the third local oscillation signal and the fourth local oscillation signal to obtain a Ku waveband signal. And the channels adopted by each second conversion unit are different.
In this aspect, the first conversion unit includes: a first frequency conversion module 24 and a second frequency conversion module 25; the first frequency conversion module 24 amplifies, filters and mixes the Ka band signal based on the first local oscillation signal to obtain an L band signal; the second frequency conversion module 25 amplifies, filters, and mixes the L-band signal based on the second local oscillation signal to obtain the intermediate frequency signal. Wherein, this scheme is optional, and the first frequency conversion module 24 includes: the low noise amplifier 1, the first filter 2 and the first mixer 3 are connected in sequence; the input end of the low noise amplifier 1 is used as the input end of the first frequency conversion module 24; the output end of the first mixer 3 is used as the output end of the first frequency conversion module 24; and the first frequency mixer 3 performs frequency mixing processing on the amplified and filtered Ka-band signal based on the first local oscillation signal to obtain an L-band signal. In this optional aspect, the second frequency conversion module 25 includes: the second filter 4, the first amplifier 5, the second mixer 6 and the second amplifier 7 are connected in sequence; the input end of the second filter 4 is used as the input end of the second frequency conversion module 25; the output end of the second amplifier 7 is used as the output end of the second frequency conversion module 25; the second mixer 6 processes the filtered and amplified L-band signal based on a second local oscillation signal, and obtains the intermediate frequency signal.
In this scheme, the power dividing unit adopts a first power divider 8 with three paths of outputs; each output terminal of the first power divider 8 is connected to a second conversion unit.
In this solution, the second conversion unit includes: a third frequency conversion module 26 and a fourth frequency conversion module 27; the third frequency conversion module 26 performs attenuation, filtering and frequency mixing processing on one path of intermediate frequency signal based on a third local oscillation signal to obtain an S-band signal; the fourth frequency conversion module 27 performs filtering, amplification and frequency mixing processing on the S-band signal based on a fourth local oscillation signal, so as to obtain a Ku-band signal. In this embodiment, optionally, the third frequency conversion module 26 includes: the digital control attenuator 9, the acoustic surface filter 10 and the third mixer 11 are connected in sequence;
the input end of the numerical control attenuator 9 is used as the input end of the third frequency conversion module 26; the output end of the third mixer 11 is used as the output end of the third frequency conversion module 26; the third mixer 11 performs frequency mixing processing on the intermediate frequency signal subjected to attenuation filtering based on the third local oscillation signal, so as to obtain an S-band signal. Optionally, in this scheme, the fourth frequency conversion module 27 includes: a third filter 12, a third amplifier 13, a fourth mixer 14 and an amplifier 15 connected in sequence; an input terminal of the third filter 12 is used as an input terminal of a fourth frequency conversion module 27; the output end of the power amplifier 15 is used as the output end of the fourth frequency conversion module 27; the fourth mixer 14 performs frequency mixing processing on the filtered and amplified S-band signal based on a fourth local oscillation signal, so as to obtain a Ku-band signal.
In this scheme, in order to perform output and control of local oscillation signals in a centralized manner, the repeater is further provided with a local oscillation signal generating module 28; the local oscillator signal generating module 28 generates a first local oscillator signal, a second local oscillator signal, a third local oscillator signal and a fourth local oscillator signal based on the crystal oscillator 16. Optionally, in this embodiment, the local oscillator signal generating module 28 includes: a crystal oscillator 16 and a second power divider 17 connected in sequence; a first output end of the second power divider 17 is sequentially connected with a sampling phase-locked medium oscillation source PDRO18 and a first frequency multiplier 19, and outputs a first local oscillation signal through an output end of the first frequency multiplier 19; a second output end of the second power divider 17 is connected to an integrated phase-locked frequency source PLS20, and a second local oscillator signal is output through an output end of the pulse generator; a third output end of the second power divider 17 is sequentially connected to an integrated phase-locked frequency source PLS20 and a third power divider 21, and a third local oscillator signal is output through an output end of the third power divider 21; a fourth output end of the second power divider 17 is sequentially connected to a second microwave assembly PDRO, a second frequency multiplier 22 and a fourth power divider 23, and a fourth local oscillator signal is output through an output end of the fourth power divider 23.
The present solution is further illustrated by the following examples.
As shown in fig. 1, the present embodiment provides a communication satellite transponder comprising: the frequency conversion part and the local oscillator part are integrated in a box body. When the communication satellite transponder works, an input Ka-band signal firstly enters a low noise amplifier 1, enters a first filter 2 after being amplified to filter out-of-band interference signals and enters a first frequency mixer 3, frequency mixing is carried out based on a first local oscillation signal, an output L-band signal is amplified by a first amplifier 5 after being filtered out-of-band spurious by a second filter 4 and is output to a second frequency mixer 6, and the second frequency mixer 6 carries out frequency mixing based on a second local oscillation signal to output 200-300 MHz intermediate frequency signals; the intermediate frequency signal is power-divided into three paths of signals by a first power divider 8, and each path of signal is sent to a sound meter filter 10 after amplitude adjustment by a numerical control attenuator 9 in a second conversion unit; the bandwidth of the sound meter filter 10 in the second conversion unit connected with the first path of signal is 200-230 MHz, the bandwidth of the sound meter filter 10 in the second conversion unit connected with the second path of signal is 235-265 MHz, the bandwidth of the sound meter filter 10 in the second conversion unit connected with the third path of signal is 270-300 MHz, the three paths of signals are divided into three channels by the sound meter filters 10 with different bandwidths, then the three channels pass through the third mixer 11 in each second conversion unit, the signals are mixed into S-band signals based on the third local oscillation signals, the S-band signals are sent to the third filter 12 to filter stray and amplify the S-band signals by the amplifier, then the S-band signals are sent to the fourth mixer 14, the S-band signals are mixed into Ku-band signals based on the fourth local oscillation signals, and finally the Ku-band signals are amplified by the power amplifier 15 and then output.
As shown in fig. 2, the 100MHz reference signal output by the crystal oscillator 16 is divided into four paths by the second power divider 17, the first path signal generates a Ku band signal by the sampling phase-locked medium oscillation source PDRO1820, and then generates a first local oscillation signal in Ka band by the first frequency multiplier 19; the second path of signal generates a second local oscillator signal of an L wave band through a phase-locked frequency source PLS 20; the third signal is processed by a phase-locked frequency source PLS20 to generate a third local oscillation signal of S band, and then divided into three paths by a third power divider 21 to be sent to a third mixer 11 in three channels; the fourth path of signals generates X-band signals through the sampling phase-locked medium oscillation source PDRO18, generates a fourth local oscillation signal of Ku band through the second frequency multiplier 22, and is divided into three paths by the fourth power divider 23 to be sent to the fourth mixer 14 in three channels.
The volume of the transponder can be greatly reduced by adopting the acoustic surface filter 10, the volume of the Ka-band communication satellite transponder designed by the invention is 220 multiplied by 50mm, and the noise coefficient is less than 3dB through test verification; the gain is greater than 80 dB; the adjacent channel rejection ratio is greater than 35 dBc; the third-order intermodulation is greater than 30 dBc; the phase noise is less than-90 dBc/Hz @1 KHz; EVM (error vector magnitude) is less than 10%.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
Claims (7)
1. A communication satellite transponder, the transponder comprising:
the first conversion unit is used for carrying out frequency conversion processing on the Ka waveband signal based on the first local oscillation signal and the second local oscillation signal to obtain an intermediate frequency signal;
the power division unit divides the intermediate frequency signals into a plurality of paths of intermediate frequency signals according to equal power;
the plurality of second conversion units are used for processing the plurality of paths of intermediate frequency signals based on the third local oscillator signals and the fourth local oscillator signals to obtain Ku waveband signals;
the channels used by each second conversion unit are different,
wherein the content of the first and second substances,
the second conversion unit includes:
the third frequency conversion module (26) is used for carrying out attenuation, filtering and frequency mixing processing on one path of intermediate frequency signal based on a third local oscillation signal to obtain an S-band signal;
a fourth frequency conversion module (27) for filtering, amplifying and mixing the S-band signal based on a fourth local oscillation signal to obtain a Ku-band signal,
the third frequency conversion module (26) comprises: the digital control attenuator (9), the acoustic surface filter (10) and the third mixer (11) are connected in sequence;
the input end of the numerical control attenuator (9) is used as the input end of a third frequency conversion module (26); the output end of the third mixer (11) is used as the output end of the third frequency conversion module (26);
the third mixer (11) performs frequency mixing processing on the intermediate frequency signal subjected to attenuation filtering based on a third local oscillation signal to obtain an S-band signal,
the fourth frequency conversion module (27) comprises: a third filter (12), a third amplifier (13), a fourth mixer (14) and an amplifier (15) which are connected in sequence;
an input of the third filter (12) is used as an input of a fourth frequency conversion module (27); the output end of the power amplifier (15) is used as the output end of a fourth frequency conversion module (27);
and the fourth frequency mixer (14) performs frequency mixing processing on the S-band signal after filtering and amplification based on a fourth local oscillation signal to obtain a Ku-band signal.
2. The repeater according to claim 1, wherein the first conversion unit includes:
the first frequency conversion module (24) is used for amplifying, filtering and mixing the Ka waveband signal based on the first local oscillation signal to obtain an L waveband signal;
and the second frequency conversion module (25) is used for amplifying, filtering and mixing the L-band signal based on a second local oscillation signal to obtain the intermediate frequency signal.
3. The repeater according to claim 2, characterized in that the first frequency conversion module (24) comprises: the low noise amplifier (1), the first filter (2) and the first mixer (3) are connected in sequence;
the input end of the low noise amplifier (1) is used as the input end of a first frequency conversion module (24); the output end of the first mixer (3) is used as the output end of the first frequency conversion module (24);
and the first frequency mixer (3) performs frequency mixing processing on the amplified and filtered Ka waveband signal based on the first local oscillation signal to obtain an L waveband signal.
4. The transponder according to claim 2, characterized in that the second frequency conversion module (25) comprises: the second filter (4), the first amplifier (5), the second mixer (6) and the second amplifier (7) are connected in sequence;
the input end of the second filter (4) is used as the input end of a second frequency conversion module (25); the output end of the second amplifier (7) is used as the output end of the second frequency conversion module (25);
and the second frequency mixer (6) processes the L-band signal subjected to filtering amplification based on a second local oscillation signal to obtain the intermediate frequency signal.
5. The transponder of claim 1, wherein the center frequency of each of the acoustic surface filters (10) in the plurality of third frequency conversion units is different.
6. The repeater according to claim 1, further comprising: and the local oscillation signal generation module (28) generates a first local oscillation signal, a second local oscillation signal, a third local oscillation signal and a fourth local oscillation signal based on the crystal oscillator (16).
7. The repeater according to claim 6, wherein the local oscillator signal generating module (28) comprises: a crystal oscillator (16) and a second power divider (17) which are connected in sequence;
a first output end of the second power divider (17) is sequentially connected with a sampling phase-locked medium oscillation source PDRO (18) and a first frequency multiplier (19), and a first local oscillator signal is output through an output end of the first frequency multiplier (19);
a second output end of the second power divider (17) is connected with an integrated phase-locked frequency source PLS (20), and a second local oscillator signal is output through an output end of the integrated phase-locked frequency source PLS (20);
a third output end of the second power divider (17) is sequentially connected with an integrated phase-locked frequency source PLS (20) and a third power divider (21), and a third local oscillator signal is output through an output end of the third power divider (21);
a fourth output end of the second power divider (17) is sequentially connected with a sampling phase-locked medium oscillation source PDRO (18), a second frequency multiplier (22) and a fourth power divider (23), and a fourth local oscillation signal is output through an output end of the fourth power divider (23).
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| CN110086488A (en) * | 2019-03-29 | 2019-08-02 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Radar-communication integration shares building module architectures superheterodyne receiver design method |
| CN110557189B (en) * | 2019-08-23 | 2021-12-14 | 北京无线电测量研究所 | V-band communication satellite transponder |
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