CN116248135A - Satellite-borne X-frequency band miniaturized data transmission transmitter - Google Patents
Satellite-borne X-frequency band miniaturized data transmission transmitter Download PDFInfo
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- CN116248135A CN116248135A CN202310146117.XA CN202310146117A CN116248135A CN 116248135 A CN116248135 A CN 116248135A CN 202310146117 A CN202310146117 A CN 202310146117A CN 116248135 A CN116248135 A CN 116248135A
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- 230000005540 biological transmission Effects 0.000 title description 14
- 238000001914 filtration Methods 0.000 claims description 28
- 238000005070 sampling Methods 0.000 claims description 25
- 238000012545 processing Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 238000007493 shaping process Methods 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 6
- 238000009432 framing Methods 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000013507 mapping Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 230000010354 integration Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 6
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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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
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application relates to a miniaturized data transmitter of space-borne X frequency channel, includes: the system comprises an FPGA module, a high-speed DAC module, an X-frequency band bandpass filter and an X-frequency band amplifier; the image frequency output by the high-speed DAC is utilized to generate an X-frequency-band modulation signal, when the X-frequency-band modulation signal is generated, a microwave modulation up-conversion module and a local oscillator signal required by modulation up-conversion are not needed, the image frequency in the DAC output signal is utilized to directly generate the X-frequency-band modulation signal, the integration level of the system is greatly improved, the hardware cost is reduced, and the system has obvious advantages compared with the traditional scheme in the aspects of single machine weight, complete machine integration level and the like.
Description
Technical Field
The application relates to the technical field of microwave high-speed high-capacity communication, in particular to a satellite-borne X-frequency-band miniaturized data transmission transmitter.
Background
At present, the X frequency band is a frequency band mainly adopted by low-orbit remote sensing satellites, particularly commercial remote sensing satellites for transmitting data to the ground, and as the resolution of the remote sensing satellites is higher, the data rate required to be transmitted is higher, which leads to the fact that the hardware design related to the satellite data transmission is more and more complex. Meanwhile, in order to reduce the cost of satellite transmission and hardware implementation, the integrated design requirements of the whole satellite and a single unit (module) are more and more urgent, and the contradiction between higher and higher speed and higher integrated requirements in the design process of the satellite-borne data transmission transmitter is needed to be solved.
The traditional satellite-borne X-band data transmission transmitter consists of FPGA (Field Programmable Gate Array), a high-speed DAC (digital-to-analog converter), a baseband clock, a radio frequency local oscillator and a microwave modulation (up-conversion) module. The FPGA receives data and processes the baseband data, the baseband clock module generates a sampling clock required by the operation of the high-speed DAC, the high-speed DAC converts digital signals output by the FPGA into baseband analog signals, the radio-frequency local oscillator generates local oscillator signals required by modulation up-conversion, and the microwave modulation up-conversion module modulates (up-converts) the baseband signals to an X frequency band. The X-band modulation signal is generated according to the traditional design thought, if the integration level of a hardware circuit needs to be improved, the integration level of components and peripheral circuits adopted in each module is mainly improved, and the integration design difficulty is high.
Disclosure of Invention
In order to overcome at least one defect in the prior art, the embodiment of the application provides a satellite-borne X-frequency-band miniaturized data transmission transmitter.
In a first aspect, there is provided a miniaturized data transmitter for an on-board X-band, comprising: the system comprises an FPGA module, a high-speed DAC module, an X-frequency band bandpass filter and an X-frequency band amplifier;
the FPGA module is used for modulating and digitally up-converting the baseband signal to obtain a processed digital signal;
the high-speed DAC module is used for up-converting the processed digital signal to an intermediate frequency and outputting an intermediate frequency signal and a plurality of mirror image frequency components;
the X-frequency band-pass filter is used for carrying out frequency-selecting filtering treatment on the intermediate frequency signal and the image frequency components to obtain a signal after the frequency-selecting filtering treatment;
the X-band amplifier is used for carrying out power amplification processing on the signals subjected to the frequency selection filtering processing and outputting X-band modulation signals.
In one embodiment, the frequency of the signal after the frequency selective filtering process is fs+fc, where Fc is the intermediate frequency carrier frequency and Fs is the sampling rate.
In one embodiment, the high speed DAC module has a sampling rate of 6Gsps and an intermediate carrier frequency of 1.5GHz to 2.5GHz.
In one embodiment, modulating the baseband signal includes: AOS framing, signal coding, constellation mapping, and shaping filtering.
In one embodiment, further comprising: and the DAC sampling clock is used for generating sampling clocks required by the operation of the high-speed DAC module.
In a second aspect, there is provided a method for generating an X-band modulated signal, including:
modulating and digitally up-converting the baseband signal to obtain a processed digital signal;
up-converting the processed digital signal to an intermediate frequency, and outputting an intermediate frequency signal and a plurality of mirror frequency components;
performing frequency-selecting filtering processing on the intermediate frequency signal and the image frequency components to obtain a signal subjected to the frequency-selecting filtering processing;
and performing power amplification processing on the signal subjected to the frequency selection filtering processing, and outputting an X-frequency band modulation signal.
In one embodiment, the frequency of the signal after the frequency selective filtering process is fs+fc, where Fc is the intermediate frequency carrier frequency and Fs is the sampling rate.
In one embodiment, the high speed DAC module has a sampling rate of 6Gsps and an intermediate carrier frequency of 1.5GHz to 2.5GHz.
In one embodiment, modulating the baseband signal includes: AOS framing, signal coding, constellation mapping, and shaping filtering.
In one embodiment, the method further comprises generating a sampling clock required for operation of the high-speed DAC module.
Compared with the prior art, the application has the following beneficial effects: the application provides a novel satellite-borne X frequency band miniaturized data transmission transmitter, image frequency that utilizes high-speed DAC output produces X frequency band modulation signal, when producing X frequency band modulation signal, no longer need microwave modulation up-conversion module and modulate the required local oscillator signal of up-conversion, utilize image frequency in the high-speed DAC output signal directly to produce the modulation signal of X frequency band, greatly promoted the integrated level of system, reduced hardware cost, have obvious advantage in the aspects such as unit weight and complete machine integrated level and compared with traditional scheme.
Drawings
The present application may be better understood by reference to the following description taken in conjunction with the accompanying drawings, which are incorporated in and form a part of this specification, together with the following detailed description. In the drawings:
FIG. 1 shows a schematic diagram of a time domain waveform of an original signal;
FIG. 2 shows a schematic diagram of the output signal of the DAC module;
FIG. 3 shows a schematic diagram of the reconstructed signal in the frequency domain;
fig. 4 shows a hardware block diagram of a miniaturized data transmitter of a satellite-borne X-band according to an embodiment of the present application;
FIG. 5 shows a schematic diagram of generating an X frequency modulated signal;
fig. 6 shows a flowchart of modulating a baseband signal, digitally up-converting by an FPGA module according to an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual embodiment are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions may be made to achieve the developers' specific goals, and that these decisions may vary from one implementation to another.
It should be noted that, in order to avoid obscuring the present application with unnecessary details, only the device structures closely related to the solution according to the present application are shown in the drawings, and other details not greatly related to the present application are omitted.
It is to be understood that the present application is not limited to the described embodiments due to the following description with reference to the drawings. In this context, embodiments may be combined with each other, features replaced or borrowed between different embodiments, one or more features omitted in one embodiment, where possible.
According to the baseband sampling theorem, when the sampling rate Fs is greater than 2 times the signal bandwidth, any bandwidth-limited signal can be reconstructed, fig. 1 shows a schematic diagram of the original signal time domain waveform, denoted by T S Sampling (T) the time domain signal for a sampling period S ＝1/F S ) Fs is the sampling rate, the most common sampling method is sample-and-hold, and fig. 2 shows a schematic diagram of the output signal of the DAC module, which can be understood as the convolution of the sampled pulse train with a rectangular pulse of unit amplitude of pulse width Ts.
Fig. 3 shows a schematic diagram of the reconstructed signal in the frequency domain. When the high-speed DAC module outputs a signal with the frequency Fc, the signal can be generated in the frequency domain at the same time: and image frequency components such as Fs-Fc, fs+Fc, 2Fs-Fc, 2Fs+Fc … and the like.
In most application processes, a DAC is used to generate a baseband original signal, and the rest image frequency components are all useless signals, which need to be filtered by a filter. In fact, depending on the frequency of the desired signal, the image frequency may also be output as a final useful signal, which is used by the present application to "up-convert" within the high-speed DAC module, thereby producing a wideband modulated signal in the X-band.
The application provides a satellite-borne X frequency band miniaturized data transmission transmitter, which utilizes the mirror frequency output by a high-speed DAC module to generate an X frequency band modulation signal, designs the satellite-borne X frequency band miniaturized data transmission transmitter based on the principle, can simplify the hardware architecture, and improves the integration level of the whole machine.
Fig. 4 shows a hardware block diagram of a miniaturized data transmitter of an on-board X-band according to an embodiment of the present application, where the miniaturized data transmitter of the on-board X-band includes: the system comprises an FPGA module, a high-speed DAC module, an X-frequency band bandpass filter and an X-frequency band amplifier;
the FPGA module is used for modulating and digitally up-converting the baseband signal to obtain a processed digital signal;
the high-speed DAC module is used for up-converting the processed digital signal to an intermediate frequency and outputting an intermediate frequency signal and a plurality of mirror image frequency components;
the X-frequency band-pass filter is used for carrying out frequency-selecting filtering treatment on the intermediate frequency signal and the image frequency components to obtain a signal after the frequency-selecting filtering treatment;
the X-band amplifier is used for carrying out power amplification processing on the signals subjected to the frequency selection filtering processing and outputting X-band modulation signals.
In the embodiment, the image frequency output by the high-speed DAC module is utilized to generate the X-frequency-band modulation signal, when the X-frequency-band modulation signal is generated, the microwave modulation up-conversion module and the local oscillator signal required by modulation up-conversion are not needed, and the image frequency in the output signal of the high-speed DAC module is utilized to directly generate the X-frequency-band modulation signal, so that the integration level of the system is greatly improved, the hardware cost is reduced, and the system has obvious advantages compared with the traditional scheme in the aspects of single machine weight, complete machine integration level and the like. In addition, the high-speed DAC module is adopted, so that the X-band miniaturized data transmission transmitter can realize transmission of data at hundreds of Mbps.
In one embodiment, the frequency of the signal after the frequency selective filtering process is fs+fc, where Fc is the intermediate frequency carrier frequency and Fs is the sampling rate. Fig. 5 shows a schematic diagram of generating an X-frequency modulated signal. Furthermore, the sampling rate of the high-speed DAC module is 6Gsps, the intermediate frequency carrier frequency is 1.5 GHz-2.5 GHz, and the DAC can generate corresponding modulation signals at the frequency Fs+Fc (about 8 GHz) according to the finally required X-band carrier frequency.
In one embodiment, fig. 6 shows a flowchart of modulating and digitally up-converting a baseband signal by an FPGA module according to an embodiment of the present application, and referring to fig. 6, after the FPGA module performs AOS (advanced on-orbit system, advanced Orbiting Systems) framing, signal encoding, constellation mapping, shaping filtering and digitally up-converting on the baseband signal, the processed digital signal is output to a high-speed DAC module. Here, the AOS framing is performed according to the frame format requirement specified by the CCSDS (international data system consultation committee, consultative Committee for Space Data Systems) standard, the channel coding may use an LDPC (Low-density Parity-check) or an rs+ convolutional concatenated code, the baseband data is constellation mapped according to a specified modulation mode, the mapped data is subjected to shaping filtering and digital up-conversion, the shaping filtering is implemented by adopting a table look-up method, and the core of the table look-up method is the data in the table, which are the convolution values of the required filter impulse response and the input symbol.
In one embodiment, the miniaturized data transmitter of space-borne X frequency band further comprises: and the DAC sampling clock is used for generating sampling clocks required by the operation of the high-speed DAC module.
In a second aspect, an embodiment of the present application further provides a method for generating an X-band modulated signal, where the method is based on the satellite-borne X-band miniaturized data transmitter provided in the foregoing embodiment, and the method includes:
step S1, modulating and digitally up-converting a baseband signal to obtain a processed digital signal;
step S2, up-converting the processed digital signal to an intermediate frequency, and outputting the intermediate frequency signal and a plurality of mirror image frequency components;
step S3, frequency-selecting filtering processing is carried out on the intermediate frequency signal and the mirror frequency components, and signals after the frequency-selecting filtering processing are obtained;
and S4, performing power amplification processing on the signal subjected to the frequency selection filtering processing, and outputting an X-frequency band modulation signal.
In sum, the satellite-borne X-frequency band miniaturized data transmission transmitter adopts a new X-frequency band modulation signal generation mode, greatly simplifies the hardware architecture, reduces the realization cost, can be subsequently applied to the design of the satellite-borne X-frequency band transmitter, improves the integration level of the whole machine, and reduces the volume and the weight of a single machine.
The foregoing is merely various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A miniaturized data transmitter for a satellite-borne X-band, comprising: the system comprises an FPGA module, a high-speed DAC module, an X-frequency band bandpass filter and an X-frequency band amplifier;
the FPGA module is used for modulating and digitally up-converting the baseband signal to obtain a processed digital signal;
the high-speed DAC module is used for up-converting the processed digital signal to an intermediate frequency and outputting an intermediate frequency signal and a plurality of mirror image frequency components;
the X frequency band-pass filter is used for carrying out frequency selection filtering processing on the intermediate frequency signal and the image frequency components to obtain a signal after the frequency selection filtering processing;
the X frequency band amplifier is used for carrying out power amplification processing on the signals subjected to the frequency selection filtering processing and outputting X frequency band modulation signals.
2. The miniaturized data transmitter of claim 1, wherein the frequency of the signal after the frequency selective filtering is fs+fc, where Fc is an intermediate frequency carrier frequency and Fs is a sampling rate.
3. The miniaturized data transmitter of the satellite-borne X-band of claim 2, wherein the high-speed DAC module has a sampling rate of 6Gsps and an intermediate frequency carrier frequency of 1.5GHz to 2.5GHz.
4. The miniaturized data transmitter of the X-band on board of claim 1, wherein the modulating the baseband signal comprises: AOS framing, signal coding, constellation mapping, and shaping filtering.
5. The miniaturized data transmitter of the satellite-borne X-band of claim 1, further comprising: and the DAC sampling clock is used for generating sampling clocks required by the operation of the high-speed DAC module.
6. A method for generating an X-band modulated signal, comprising:
modulating and digitally up-converting the baseband signal to obtain a processed digital signal;
up-converting the processed digital signal to an intermediate frequency, and outputting an intermediate frequency signal and a plurality of mirror frequency components;
performing frequency-selecting filtering processing on the intermediate frequency signal and the image frequency components to obtain a frequency-selecting filtered signal;
and performing power amplification processing on the signal subjected to the frequency selection filtering processing, and outputting an X-frequency band modulation signal.
7. The method of claim 6, wherein the frequency of the frequency-selective filtered signal is fs+fc, where Fc is an intermediate frequency carrier frequency and Fs is a sampling rate.
8. The method of claim 7, wherein the high speed DAC module has a sampling rate of 6Gsps and an intermediate carrier frequency of 1.5GHz to 2.5GHz.
9. The method of claim 6, wherein modulating the baseband signal comprises: AOS framing, signal coding, constellation mapping, and shaping filtering.
10. The method of claim 6, further comprising generating a sampling clock required for operation of the high-speed DAC module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310146117.XA CN116248135A (en) | 2023-02-21 | 2023-02-21 | Satellite-borne X-frequency band miniaturized data transmission transmitter |
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| CN202310146117.XA CN116248135A (en) | 2023-02-21 | 2023-02-21 | Satellite-borne X-frequency band miniaturized data transmission transmitter |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003092183A2 (en) * | 2002-04-10 | 2003-11-06 | Nanotron Technologies Gmbh | Transceiver device |
| CN104218959A (en) * | 2014-09-30 | 2014-12-17 | 中国电子科技集团公司第三十六研究所 | Design method of analog-variable-frequency-free radio frequency digitizing transmitter and transmitter |
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- 2023-02-21 CN CN202310146117.XA patent/CN116248135A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003092183A2 (en) * | 2002-04-10 | 2003-11-06 | Nanotron Technologies Gmbh | Transceiver device |
| CN104218959A (en) * | 2014-09-30 | 2014-12-17 | 中国电子科技集团公司第三十六研究所 | Design method of analog-variable-frequency-free radio frequency digitizing transmitter and transmitter |
Non-Patent Citations (2)
| Title |
|---|
| SHIOU-LI CHEN等: "Development of a low cost and high data rate X-band transmitter for micro-satellite applications", 《2017 IEEE ASIA PACIFIC MICROWAVE CONFERENCE (APMC)》, 11 January 2018 (2018-01-11) * |
| 陈皓滢: "K波段群时延校准收发***的研制", 《中国优秀硕士学位论文全文数据库-信息科技辑》, 3 June 2016 (2016-06-03) * |
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