CN114598382B - Conduction integrated satellite-based receiving and transmitting ground station baseband system - Google Patents
Conduction integrated satellite-based receiving and transmitting ground station baseband system Download PDFInfo
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- CN114598382B CN114598382B CN202210241251.3A CN202210241251A CN114598382B CN 114598382 B CN114598382 B CN 114598382B CN 202210241251 A CN202210241251 A CN 202210241251A CN 114598382 B CN114598382 B CN 114598382B
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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
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
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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
- H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
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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
Abstract
The invention discloses a base band system of a conducting integrated satellite-based receiving and transmitting ground station, which comprises a base band uplink conducting integrated signal transmitting link, a satellite downlink loop or an antenna radio frequency loop conducting integrated signal receiving link and a satellite downlink communication signal receiving link, wherein the base band uplink conducting integrated signal transmitting link, the satellite downlink loop or the antenna radio frequency loop conducting integrated signal receiving link and the satellite downlink communication signal receiving link are formed by an upper computer unit, a base band signal generating module, an intermediate frequency channel module, a base band signal receiving and processing module, a frequency synthesis module, a ground station antenna and a radio frequency system; compared with the traditional navigation baseband or communication baseband which only has single ranging signals or receiving and transmitting of communication signals, the ground station baseband system provided by the invention has the capability of transmitting and receiving conduction integrated signals and the capability of receiving single communication signals, and can serve the conduction integrated system based on satellites.
Description
Technical Field
The invention relates to satellite navigation and satellite communication technology, in particular to a base band system of a conduction integrated satellite base transceiver ground station.
Background
The satellite navigation system realizes PVT service for users through medium orbit satellites and geosynchronous satellite constellations, and the data communication service is mainly used for transmitting navigation messages. Satellite communication systems often implement high-rate communication services to subscribers via geostationary satellites. If a user needs to realize the functions of navigation and communication at the same time, the terminal of the satellite navigation system and the terminal of the satellite communication system are required to be provided at the same time, and a system integrating the functions of navigation and communication is not realized.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a conduction integrated satellite-based receiving and transmitting ground station baseband system based on a forwarding satellite navigation test system, which is used for realizing the generation, transmission and receiving processing of navigation communication integrated signals.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a base band system of a conducting integrated satellite-based receiving and transmitting ground station comprises a base band uplink conducting integrated signal transmitting link, a satellite downlink loop or antenna radio frequency loop conducting integrated signal receiving link and a satellite downlink communication signal receiving link, wherein the base band uplink conducting integrated signal transmitting link, the satellite downlink loop or antenna radio frequency loop conducting integrated signal receiving link and the satellite downlink communication signal receiving link are formed by an upper computer unit, a base band signal generating module, an intermediate frequency channel module, a base band signal receiving and processing module, a frequency synthesis module, a ground station antenna and a radio frequency system; wherein, the liquid crystal display device comprises a liquid crystal display device,
the upper computer unit is used for sending and receiving the navigation message and the communication message, and resolving the extracted navigation observed quantity and the received navigation message and communication message;
the baseband signal generation module is used for respectively carrying out channel coding, spread spectrum modulation and intermediate frequency carrier modulation on the navigation message and the communication message issued by the upper computer unit to generate an integrated intermediate frequency signal of baseband uplink navigation communication; the modulated intermediate frequency signal is selected by a gating device, an intermediate frequency digital signal under the current configuration is output, and then an analog intermediate frequency signal is output to an intermediate frequency channel module by a DA conversion module;
the intermediate frequency channel module is used for filtering and controlling the power of the analog intermediate frequency signal output by the baseband signal generating module in the baseband uplink conduction integrated signal transmitting link, and transmitting the output intermediate frequency signal to the ground station antenna and the radio frequency system for transmitting; the method comprises the steps that in a satellite downlink loop or an antenna radio frequency loop conduction integrated signal receiving link and a satellite downlink communication signal receiving link, intermediate frequency signals output by a ground station antenna and a radio frequency system are filtered and power controlled, and intermediate frequency analog signals are output to enter a baseband signal receiving and processing module;
the baseband signal receiving and processing module is used for carrying out AD analog-to-digital conversion on the received intermediate frequency analog signal, carrying out digital down-conversion on the digital intermediate frequency signal output by the AD conversion, capturing and tracking the near zero frequency digital baseband signal after the down-conversion, carrying out navigation message synchronization, channel decoding and message extraction on the navigation branch signal, and sending the navigation message to the upper computer unit for resolving; performing observed quantity extraction on the ranging branch, and sending a measurement result to an upper computer unit for processing; synchronizing, decoding and extracting communication messages of the communication branch signals, and transmitting the communication messages to an upper computer unit; for the intermediate frequency analog signals of the satellite downlink communication signal receiving link, the received intermediate frequency analog signals are subjected to AD analog-to-digital conversion, digital down-conversion is carried out on the digital intermediate frequency signals output by the AD conversion, the near zero frequency digital baseband signals subjected to down-conversion are captured, tracked, synchronized, channel decoded, communication text extracted, and the communication text is sent to an upper computer unit;
the frequency synthesis module is used for generating and distributing working clocks of all modules in the baseband system of the ground station and providing homologous working clocks for all modules of the baseband system;
the ground station antenna and the radio frequency system are used for carrying out up-conversion on intermediate frequency signals subjected to filtering and power control by the intermediate frequency channel module in the baseband uplink conduction integrated signal transmitting link, and transmitting the intermediate frequency signals to a satellite after passing through the power amplifier antenna; the integrated signal receiving link is used for receiving the integrated signal of the satellite downlink or the radio frequency self loop and outputting an intermediate frequency signal, and the integrated signal receiving link is used for receiving the communication signal forwarded by the satellite and outputting the intermediate frequency signal.
Further, the upper computer unit is a single board computer.
Further, the frequency synthesizer module adopts an external reference clock or an internal high-stability crystal oscillator as a clock source.
Compared with the prior art, the invention has the following technical effects:
compared with the traditional navigation baseband or communication baseband which only has single ranging signals or receiving and transmitting of communication signals, the ground station baseband system provided by the invention has the capability of transmitting and receiving conduction integrated signals and the capability of receiving single communication signals, and can serve the conduction integrated system based on satellites.
Drawings
Fig. 1 is a hardware block diagram of a baseband system of a conductive integrated satellite-based transceiver ground station according to an embodiment of the present invention;
fig. 2 is a baseband processing flow chart of a baseband system of a conductive integrated satellite-based transceiver ground station according to an embodiment of the present invention;
fig. 3 is a block diagram of a conductive integrated satellite-based transceiver ground station baseband system and a terminal system used in cooperation with the same according to an embodiment of the present invention.
Detailed Description
The following examples illustrate the invention in further detail.
Referring to fig. 1-3, the present embodiment provides a conductive integrated satellite-based transceiver ground station baseband system, which includes an upper computer unit, a baseband signal generating module, an intermediate frequency channel module, a baseband signal receiving and processing module, a frequency synthesis module, a ground station antenna and a radio frequency system;
the upper computer unit is used for sending and receiving the navigation message and the communication message, and resolving the extracted navigation observed quantity and the received navigation message and communication message;
the baseband signal generation module is used for respectively carrying out LDPC/convolution code channel coding, spread spectrum BPSK modulation and intermediate frequency 143.22MHz carrier modulation on the navigation message and the communication message issued by the upper computer unit to generate an integrated intermediate frequency signal for baseband uplink navigation communication; the modulated intermediate frequency signal is selected by a gating device, an intermediate frequency digital signal under the current configuration is output, and then an analog intermediate frequency signal is output to an intermediate frequency channel module by a DA conversion module;
the intermediate frequency channel module is used for filtering and controlling the power of the analog intermediate frequency signal output by the baseband signal generating module in the baseband uplink conduction integrated signal transmitting link, and transmitting the output intermediate frequency signal to the ground station antenna and the radio frequency system for transmitting; the method comprises the steps that in a satellite downlink loop or antenna radio frequency loop conduction integrated signal receiving link, intermediate frequency signals output by a ground station antenna and a radio frequency system are filtered and power controlled, and 143.22MHz intermediate frequency analog signals are output to enter a baseband signal receiving and processing module; the system comprises a satellite downlink communication signal receiving link, a baseband signal receiving processing module and a ground station antenna, wherein the satellite downlink communication signal receiving link is used for filtering and controlling the power of intermediate frequency signals sent by the ground station antenna and a radio frequency system, and outputting 140MHz intermediate frequency analog signals to enter the baseband signal receiving processing module;
the baseband signal receiving and processing module is used for carrying out AD analog-to-digital conversion on the received intermediate frequency analog signal, carrying out digital down-conversion on the digital intermediate frequency signal output by the AD conversion, capturing and tracking the near zero frequency digital baseband signal after the down-conversion, carrying out navigation message synchronization, channel decoding and message extraction on the navigation branch signal, and sending the navigation message to the upper computer unit for resolving; performing observed quantity extraction on the ranging branch, and sending a measurement result to an upper computer unit for processing; synchronizing, decoding and extracting communication messages of the communication branch signals, and transmitting the communication messages to an upper computer unit; for the intermediate frequency analog signals of the satellite downlink communication signal receiving link, the received intermediate frequency analog signals are subjected to AD analog-to-digital conversion, digital down-conversion is carried out on the digital intermediate frequency signals output by the AD conversion, the near zero frequency digital baseband signals subjected to down-conversion are captured, tracked, synchronized, channel decoded, communication text extracted, and the communication text is sent to an upper computer unit;
the frequency synthesis module is used for generating and distributing working clocks of all modules in the baseband system of the ground station, and can use an external reference clock or an internal high-stability crystal as a clock source to carry out frequency multiplication or frequency division so as to provide homologous working clocks for all modules of the baseband system;
the ground station antenna and the radio frequency system are used for carrying out up-conversion on intermediate frequency signals subjected to filtering and power control by the intermediate frequency channel module in the baseband uplink conduction integrated signal transmitting link, and transmitting the intermediate frequency signals to a satellite after passing through the power amplifier antenna; the integrated signal receiving link is used for receiving the integrated signal of the satellite downlink or the radio frequency self loop and outputting an intermediate frequency signal, and the integrated signal receiving link is used for receiving the communication signal forwarded by the satellite and outputting the intermediate frequency signal.
Specifically, in the baseband uplink conduction integrated signal transmitting link, the upper computer unit transmits a navigation message and a communication message to be transmitted to the baseband signal generating module, and carries out LDPC/convolution code channel coding of the navigation branch and the communication branch, BPSK spread spectrum modulation of the baseband, 143.22MHz intermediate frequency carrier modulation and DA digital-to-analog conversion; performing baseband BPSK spread spectrum modulation and DA digital-to-analog conversion of a ranging branch, sending 143.22MHz intermediate frequency signals to an intermediate frequency channel module for filtering and power control, sending the signals to a ground station antenna and a radio frequency system, and transmitting the signals to a satellite through a C2 (6368 MHz) frequency band;
in a satellite downlink loop or antenna radio frequency loop conduction integrated signal receiving link, a ground station antenna and a radio frequency system receive Cn (5022 MHz) frequency band satellite downlink conduction integrated signals, output intermediate frequency analog signals, the intermediate frequency signals are subjected to filtering and power control through an intermediate frequency channel module, the intermediate frequency signals of 143.22MHz are sent to a baseband signal receiving and processing module to be subjected to AD analog-to-digital conversion, and the navigation branch signals after digital sampling are subjected to capturing, tracking, bit synchronization, channel decoding, frame synchronization, navigation message extraction, code pseudo-range observation quantity extraction, carrier observation quantity extraction and distance measurement, and the communication branch signals after digital sampling are subjected to capturing, tracking, bit synchronization, channel decoding, frame synchronization and communication message extraction and communication function;
in a C1down (3826 MHz) frequency band satellite downlink communication signal receiving link, a ground station antenna and a radio frequency system receive communication signals forwarded by a satellite, output 140MHz intermediate frequency signals, filter and control power of the intermediate frequency signals through an intermediate frequency channel module, send the intermediate frequency signals to a baseband signal receiving and processing module, perform AD analog-to-digital conversion, and capture, track, bit synchronization, channel decoding, frame synchronization and communication text extraction of the digitally sampled communication signals.
Specifically, referring to fig. 2, the baseband signal generating module is configured to perform the following steps:
step one, a communication message and a navigation message issued by an upper computer unit enter a baseband signal generation module to carry out LDPC/convolution code channel coding, spread spectrum BPSK modulation and intermediate frequency 143.22MHz carrier modulation;
and step two, the modulated intermediate frequency signal is selected by a gating device, the intermediate frequency digital signal under the current configuration is output, the analog intermediate frequency signal is output by a DA conversion module to an intermediate frequency channel module for filtering and power control, and the output is sent to a ground station radio frequency and antenna system for transmitting.
Referring to fig. 2, the baseband signal receiving and processing module is configured to perform the following steps for a loop-on integrated signal:
step one, receiving a Cn (5022 MHz) frequency band satellite downlink conduction integrated signal by a ground station antenna and a radio frequency system, outputting an intermediate frequency analog signal, filtering and controlling the power of the intermediate frequency signal through an intermediate frequency channel module, and sending the 143.22MHz intermediate frequency signal to a baseband signal receiving and processing module;
step two, the baseband signal receiving and processing module performs AD analog-to-digital conversion on the intermediate frequency signal, and captures and tracks the near zero frequency digital baseband signal subjected to down-conversion after digital sampling;
step three, navigation text synchronization, decoding and extraction are carried out on the navigation branch signals, and text is sent to an upper computer for resolving processing; performing observed quantity extraction on the ranging branch, and sending a measurement result to an upper computer for processing; and synchronizing, decoding and extracting the communication message of the communication branch signal, and transmitting the communication message to the upper computer.
Referring to fig. 2, the baseband signal receiving and processing module is configured to perform the following steps with respect to the satellite downlink communication signal:
step one, a ground station antenna and a radio frequency system receive satellite downlink communication signals in a C1down (3826 MHz) frequency band, the communication signals after the satellite downlink communication signals are subjected to down-conversion are sent to an intermediate frequency channel module for filtering and power control, the output intermediate frequency 140MHz signals enter a baseband AD conversion module for outputting digital intermediate frequency signals, and the digital intermediate frequency signals are sent to a baseband signal receiving and processing module for digital down-conversion;
step two, capturing and tracking near zero frequency digital baseband signals after down-conversion;
and thirdly, synchronizing, decoding and extracting the communication text, and sending the communication text to an upper computer.
Claims (3)
1. A turn-on integrated star-based receiving and transmitting ground station baseband system is characterized in that: the system comprises a baseband uplink conduction integrated signal transmitting link, a satellite downlink loop or antenna radio frequency loop conduction integrated signal receiving link and a satellite downlink communication signal receiving link, wherein the baseband uplink conduction integrated signal transmitting link, the satellite downlink loop or antenna radio frequency loop conduction integrated signal receiving link and the satellite downlink communication signal receiving link are formed by an upper computer unit, a baseband signal generating module, an intermediate frequency channel module, a baseband signal receiving and processing module, a frequency synthesis module, a ground station antenna and a radio frequency system; wherein, the liquid crystal display device comprises a liquid crystal display device,
the upper computer unit is used for sending and receiving the navigation message and the communication message, and resolving the extracted navigation observed quantity and the received navigation message and communication message;
the baseband signal generation module is used for respectively carrying out channel coding, spread spectrum modulation and intermediate frequency carrier modulation on the navigation message and the communication message issued by the upper computer unit to generate an integrated intermediate frequency signal of baseband uplink navigation communication; the modulated intermediate frequency signal is selected by a gating device, an intermediate frequency digital signal under the current configuration is output, and then an analog intermediate frequency signal is output to an intermediate frequency channel module by a DA conversion module;
the intermediate frequency channel module is used for filtering and controlling the power of the analog intermediate frequency signal output by the baseband signal generating module in the baseband uplink conduction integrated signal transmitting link, and transmitting the output intermediate frequency signal to the ground station antenna and the radio frequency system for transmitting; the method comprises the steps that in a satellite downlink loop or an antenna radio frequency loop conduction integrated signal receiving link and a satellite downlink communication signal receiving link, intermediate frequency signals output by a ground station antenna and a radio frequency system are filtered and power controlled, and intermediate frequency analog signals are output to enter a baseband signal receiving and processing module;
the baseband signal receiving and processing module is used for carrying out AD analog-to-digital conversion on the received intermediate frequency analog signal, carrying out digital down-conversion on the digital intermediate frequency signal output by the AD conversion, capturing and tracking the near zero frequency digital baseband signal after the down-conversion, carrying out navigation message synchronization, channel decoding and message extraction on the navigation branch signal, and sending the navigation message to the upper computer unit for resolving; performing observed quantity extraction on the ranging branch, and sending a measurement result to an upper computer unit for processing; synchronizing, decoding and extracting communication messages of the communication branch signals, and transmitting the communication messages to an upper computer unit; for the intermediate frequency analog signals of the satellite downlink communication signal receiving link, the received intermediate frequency analog signals are subjected to AD analog-to-digital conversion, digital down-conversion is carried out on the digital intermediate frequency signals output by the AD conversion, the near zero frequency digital baseband signals subjected to down-conversion are captured, tracked, synchronized, channel decoded, communication text extracted, and the communication text is sent to an upper computer unit;
the frequency synthesis module is used for generating and distributing working clocks of all modules in the baseband system of the ground station and providing homologous working clocks for all modules of the baseband system;
the ground station antenna and the radio frequency system are used for carrying out up-conversion on intermediate frequency signals subjected to filtering and power control by the intermediate frequency channel module in the baseband uplink conduction integrated signal transmitting link, and transmitting the intermediate frequency signals to a satellite after passing through the power amplifier antenna; the integrated signal receiving link is used for receiving the integrated signal of the satellite downlink or the radio frequency self loop and outputting an intermediate frequency signal, and the integrated signal receiving link is used for receiving the communication signal forwarded by the satellite and outputting the intermediate frequency signal.
2. The on-integrated satellite-based transceiver ground station baseband system of claim 1, wherein: the upper computer unit is a single board computer.
3. The on-integrated satellite-based transceiver ground station baseband system of claim 1, wherein: the frequency synthesis module adopts an external reference clock or an internal high-stability crystal as a clock source.
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| CN103412317A (en) * | 2013-08-15 | 2013-11-27 | 上海司南卫星导航技术有限公司 | Radio-frequency circuit structure for achieving function of converting GNSS satellite signals into baseband signals |
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| CN102333057A (en) * | 2011-05-25 | 2012-01-25 | 北京航空航天大学 | Micro/nano satellite measure and control communication integral transmitting and receiving system and realization method thereof |
| CN104570023A (en) * | 2015-01-23 | 2015-04-29 | 桂林电子科技大学 | Method and system for converting GPS analog signals based on Beidou satellite signals |
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