CN114884559A - Measurement and control communication cooperative transmission method and system - Google Patents
Measurement and control communication cooperative transmission method and system Download PDFInfo
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- CN114884559A CN114884559A CN202210394933.8A CN202210394933A CN114884559A CN 114884559 A CN114884559 A CN 114884559A CN 202210394933 A CN202210394933 A CN 202210394933A CN 114884559 A CN114884559 A CN 114884559A
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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
- H04B7/18513—Transmission in a satellite or space-based system
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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
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
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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
- H04B1/69—Spread spectrum techniques
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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
- H04B7/18517—Transmission equipment in 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
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1438—Negotiation of transmission parameters prior to communication
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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 measurement and control communication cooperative transmission method and a system, belonging to the field of measurement and control communication and comprising an uplink transmission process and a downlink transmission process; a sending frequency offset compensation process for carrying out frequency offset compensation on the communication uplink sending signal by using the sending frequency offset compensation value output by uplink frequency offset resolving is arranged in the uplink transmission process; and a receiving frequency offset compensation process for performing frequency offset compensation on the communication downlink receiving signal by using the receiving frequency offset compensation value output by downlink frequency offset resolving is arranged in the downlink transmission process. The invention can realize measurement and control and communication transmission resource sharing while being compatible with the existing measurement and control communication transmission system, and effectively reduces the realization complexity of the ground station and the satellite receiver by assisting the transmission and the reception of communication signals through measurement and control information.
Description
Technical Field
The invention relates to the field of measurement and control communication, in particular to a measurement and control communication cooperative transmission method and system.
Background
The traditional aerospace measurement and control system and the satellite communication system have large difference of bearing service types due to different initial service objects of design, and are generally independently designed and deployed. With the increasing demand of low-orbit satellite communication constellation construction, on one hand, a large number of gateway stations are required to be constructed for landing of large-scale low-orbit satellite communication service data, and on the other hand, a large number of measurement and control stations are required to be constructed for daily management and control of large-scale low-orbit satellites. The existing independent construction scheme of the aerospace measurement and control system and the satellite communication system brings great cost pressure to the construction of a large-scale low-orbit satellite constellation.
In order to reduce the construction cost, the industry commonly knows that the gateway station and the measurement and control station are constructed in a unified way at present, and one set of ground station has the functions of the gateway station and the measurement and control station at the same time, so that the simultaneous transmission of measurement and control and communication services is realized.
One simultaneous transmission scheme for measurement and control communication is common-station and non-common-equipment transmission. Due to different requirements on service types and transmission rates, measurement and control and communication are generally performed on different frequency bands, for example, measurement and control are performed by adopting an S frequency band, communication is performed by adopting a Ka frequency band, and a common-station common-device transmission scheme requires that independent antennas, channels and baseband devices are configured for measurement and control and communication functions, so that system equipment is high in complexity and needs to occupy multiple frequency bands.
Another simultaneous transmission scheme for measurement and control communication is common-equipment common-signal transmission. For a scene with low requirement on the transmission rate of communication, measurement and control and communication can be uniformly designed on a transmission signal, an unbalanced QPSK signal is adopted, the code rates of I, Q branches are the same but the information rates are different, the I branch emphasizes the communication function, and the information rate is between several kbps and more than ten Mbps; the Q branch emphasizes the measurement and control function, and the modulated information rate is low. The scheme not only can multiplex transmission equipment such as antennas, channels, base bands and the like, but also realizes the signal level fusion of measurement and control and communication. However, the requirements of the new generation of low earth orbit satellites on the communication transmission rate have already reached Gbps, and the existing scheme cannot support such high data transmission rate and cannot be compatible with the existing technical system and baseband equipment.
Therefore, the prior art cannot meet the requirements of large-scale low-orbit constellation measurement and control communication common-station construction and simultaneous transmission, and a new low-complexity measurement and control communication transmission method is needed to be provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a measurement and control communication cooperative transmission method and a system, which can realize measurement and control and communication transmission resource sharing while being compatible with the prior measurement and control communication transmission system, and effectively reduce the realization complexity of a ground station and a satellite receiver by assisting the communication signal reception through measurement and control information.
The purpose of the invention is realized by the following scheme:
a measurement and control communication cooperative transmission method comprises an uplink transmission process and a downlink transmission process; a sending frequency offset compensation process for carrying out frequency offset compensation on a sending signal by using a sending frequency offset compensation value output by uplink frequency offset resolving is arranged in the communication uplink sending baseband processing in the uplink transmission process, and the frequency offset information of the communication uplink sending baseband processing is crosslinked with the measurement and control downlink receiving baseband processing by using the uplink frequency offset resolving; in the downlink transmission process, a receiving frequency offset compensation process for performing frequency offset compensation on a received signal by using a receiving frequency offset compensation value output by downlink frequency offset resolving is arranged in the processing of a communication downlink receiving baseband, and the frequency offset information of the communication downlink receiving baseband processing is crosslinked with the processing of a measurement and control downlink receiving baseband by using the downlink frequency offset resolving.
Further, in the uplink transmission process, the method comprises the following substeps:
at a ground station, after being subjected to first coding modulation, framing and spread spectrum after the measurement and control information is packaged, the measurement and control information is converted into an uplink measurement and control intermediate frequency through first digital up-conversion; meanwhile, after the communication information is packaged, the communication information is subjected to second coding modulation, framing and sending frequency offset compensation, and then is subjected to second digital up-conversion and frequency conversion to an uplink communication intermediate frequency;
the uplink measurement and control intermediate frequency signal and the uplink communication intermediate frequency signal enter a DAC (digital-to-analog converter), a radio frequency sending channel, a duplexer and an antenna after being combined to realize uplink signal transmission;
in the satellite, the uplink signal respectively enters the satellite-borne measurement and control baseband and the satellite-borne communication baseband after passing through the antenna, the duplexer, the radio frequency receiving channel and the power divider to complete uplink processing.
Further, in the downlink transmission process, the method comprises the following substeps:
downlink intermediate frequency signals processed by a satellite, a satellite-borne measurement and control baseband and a satellite-borne communication baseband realize downlink signal transmission through a combiner, a radio frequency transmission channel, a duplexer and an antenna;
at a ground station, downlink signals pass through an antenna, a duplexer, a radio frequency receiving channel, an ADC and a shunt circuit to obtain downlink measurement and control intermediate frequency signals and downlink communication intermediate frequency signals;
the downlink measurement and control intermediate frequency signal is subjected to a first digital filter, a first digital down-conversion, capturing, first loop tracking, first demodulation decoding and measurement and control information analysis to obtain downlink measurement and control information; meanwhile, downlink communication intermediate frequency signals are subjected to second digital filters, second digital down-conversion, downlink frequency offset calculation, receiving frequency offset compensation, second loop tracking, second demodulation decoding and communication information analysis to obtain downlink communication information.
Further, the transmission frequency offset compensation process includes the sub-steps of:
resolving frequency estimation value f output by capture by uplink frequency offset acq Clock error estimation value sigma of analysis output of measurement and control information s Preset downlink measurement and control radio frequency center frequency f dw_TTC And up communication radio frequency center frequency f up_COM Resolving to obtain a sending frequency offset compensation value f bias_up Designing a calculation formula of the transmitted frequency offset compensation value as follows:
further, the receiving frequency offset compensation process includes the sub-steps of:
downlink frequency offset resolving frequency estimation value f output by capture acq Preset downlink measurement and control radio frequency center frequency f dw_TTC And downlink communication radio frequency center frequency f dw_COM Resolving to obtain a receiving frequency offset compensation value f bias_dw Designing a calculation formula of the received frequency offset compensation value as follows:
furthermore, the working frequency range supported by the antennas and duplexers of the ground station and the satellite is larger than the maximum frequency range occupied by the uplink and downlink measurement and control signals and the communication signals.
Further, the working frequency range supported by the DAC and the radio frequency transmitting channel of the ground station, the radio frequency receiving channel of the satellite and the power divider is larger than the maximum frequency range occupied by the uplink measurement and control and communication signals.
Furthermore, the working frequency range supported by the combiner, the radio frequency transmitting channel, the radio frequency receiving channel of the ground station and the ADC is larger than the maximum frequency range occupied by the downlink measurement and control and communication signals.
Furthermore, the frequency interval between the uplink measurement and control intermediate frequency and the uplink communication intermediate frequency is at least more than half of the sum of the uplink measurement and control signal bandwidth and the uplink communication signal bandwidth; the frequency interval between the downlink measurement and control intermediate frequency and the downlink communication intermediate frequency is at least more than half of the sum of the downlink measurement and control signal bandwidth and the downlink communication signal bandwidth.
A measurement and control communication cooperative transmission system comprises a baseband processing device, a downlink frequency offset resolving unit, an uplink frequency offset resolving unit and front-end equipment, wherein the baseband processing device comprises a measurement and control downlink receiving baseband processing unit, a communication downlink receiving baseband processing unit, a measurement and control uplink sending baseband processing unit and a communication uplink sending baseband processing unit; the receiving frequency offset compensation unit is connected with the downlink frequency offset resolving unit, and the downlink frequency offset resolving unit is connected with a capture module of the measurement and control downlink receiving baseband processing unit; the system comprises a measurement and control downlink receiving baseband processing unit, a measurement and control uplink sending baseband processing unit, a communication downlink receiving baseband processing unit and a communication uplink sending baseband processing unit of the baseband processing device, and the front-end equipment is shared.
The beneficial effects of the invention include:
the invention can realize measurement and control and communication transmission resource sharing while being compatible with the existing measurement and control communication transmission system, and simultaneously, the invention effectively reduces the realization complexity of the ground station and the satellite receiver by assisting the communication signal receiving through the measurement and control information. Specifically, through the baseband cross-linking design, the frequency offset resolving unit is utilized to realize the sharing of the frequency offset information of the measurement and control baseband processing unit and the communication baseband processing unit, and compared with the traditional independent design, the frequency offset range to be processed by the communication baseband is reduced, and the complexity of realizing the communication baseband is reduced. Furthermore, on the basis of a baseband cross-linking design, through a common design of front-end equipment such as an antenna and a duplexer, two sets of antennas and duplex equipment with independent measurement and control and communication are avoided, the equipment integration level is improved, the system complexity when the measurement and control and the communication coexist is further reduced, and the implementation cost is reduced.
In the embodiment of the invention, the received communication signal is subjected to the received frequency offset compensation by using the downlink frequency offset resolving result, so that the received frequency offset required to be processed by the downlink communication signal can be reduced, and the complexity of a ground station receiver is reduced.
In the embodiment of the invention, the uplink frequency offset resolving result is utilized to carry out transmission frequency offset compensation on the transmission communication signal, so that the receiving frequency offset required to be processed by the uplink communication signal can be reduced, and the complexity of a satellite receiver is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a ground station according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a satellite implementation in an embodiment of the invention;
fig. 3 is a schematic diagram of a downlink frequency offset resolving unit in fig. 1;
fig. 4 is a schematic diagram of the uplink frequency offset solution unit in fig. 1.
Detailed Description
All features disclosed in all embodiments in this specification, or all methods or process steps implicitly disclosed, may be combined and/or expanded, or substituted, in any way, except for mutually exclusive features and/or steps.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a measurement and control communication cooperative transmission method, including an uplink transmission part and a downlink transmission part.
The uplink transmission comprises the following specific steps:
at a ground station:
after the measurement and control information is packed, the information is coded and modulated 1, framed and spread, and then is converted into an uplink measurement and control intermediate frequency through digital up-conversion 1 to obtain an uplink measurement and control intermediate frequency signal.
After being packed, the communication information is subjected to coding modulation 2, framing and sending frequency offset compensation, and then is subjected to frequency conversion to uplink communication intermediate frequency through digital up-conversion 2 to obtain uplink communication intermediate frequency signals.
The uplink measurement and control intermediate frequency signal and the uplink communication intermediate frequency signal enter the DAC, the radio frequency sending channel, the duplexer and the antenna after being digitally combined to realize uplink wireless signal transmission.
In the case of a satellite:
after being received by an antenna, the uplink wireless signals sequentially enter a duplexer, a radio frequency receiving channel and a power divider, and are divided by the power divider to obtain two paths of uplink intermediate frequency signals;
the two paths of uplink intermediate frequency signals respectively enter the satellite-borne measurement and control baseband and the satellite-borne communication baseband to complete uplink measurement and control and communication processing, and uplink measurement and control information and uplink communication information are obtained.
The specific steps for downlink transmission include:
in the satellite:
the measurement and control information and the communication information are processed by a satellite-borne measurement and control base band and a satellite-borne communication base band to respectively obtain a downlink measurement and control intermediate frequency signal and a downlink communication intermediate frequency signal;
the downlink measurement and control intermediate frequency signal and the downlink communication intermediate frequency signal are combined by the combiner to obtain a downlink intermediate frequency signal, and the downlink intermediate frequency signal sequentially enters the radio frequency sending channel, the duplexer and the antenna to realize downlink wireless signal transmission.
At a ground station:
the downlink wireless signal is received by an antenna and then sequentially enters a duplexer, a radio frequency receiving channel, an ADC and a digital shunt circuit to obtain a downlink measurement and control intermediate frequency signal and a downlink communication intermediate frequency signal;
the downlink measurement and control intermediate frequency signal is subjected to digital filter 1, digital down-conversion 1, capturing, loop tracking 1, demodulation decoding 1 and measurement and control information analysis to obtain downlink measurement and control information.
The downlink communication intermediate frequency signal is subjected to digital filter 2, digital down-conversion 2, downlink frequency offset compensation, loop tracking 2, demodulation decoding 2 and communication information analysis to obtain downlink communication information.
As shown in FIG. 3, in the downlink transmission, the frequency offset resolving unit outputs the frequency estimation value f from the capturing unit acq Preset downlink measurement and control radio frequency center frequency f dw_TTC And downlink communication radio frequency center frequency f dw_COM Resolving to obtain a receiving frequency offset compensation value f bias_dw The received frequency offset compensation value calculation formula is as follows:
as shown in FIG. 4, in the uplink transmission, the frequency estimation value f outputted by the acquisition unit of the uplink frequency offset resolving unit acq Clock error estimation value sigma output by measurement and control information analysis unit s Preset downlink measurement and control radio frequency center frequency f dw_TTC And up communication radio frequency center frequency f up_COM Resolving to obtain a sending frequency offset compensation value f bias_up The calculation formula of the transmitted frequency offset compensation value is as follows:
in the above embodiment:
the working frequency range supported by the antennas and duplexers of the ground station and the satellite is larger than the maximum frequency range occupied by the uplink and downlink measurement and control and communication signals.
The working frequency range supported by the DAC and the radio frequency transmitting channel of the ground station, the radio frequency receiving channel of the satellite and the power divider is larger than the maximum frequency range occupied by the uplink measurement and control and communication signals.
The working frequency range supported by the combiner, the radio frequency transmitting channel, the radio frequency receiving channel and the ADC of the ground station is larger than the maximum frequency range occupied by the downlink measurement and control and communication signals.
The frequency interval between the uplink measurement and control intermediate frequency and the uplink communication intermediate frequency is to ensure that the uplink measurement and control signal and the uplink communication signal do not interfere with each other, that is, the frequency interval is at least greater than half of the sum of the bandwidth of the uplink measurement and control signal and the bandwidth of the uplink communication signal.
The frequency interval between the downlink measurement and control intermediate frequency and the downlink communication intermediate frequency is to ensure that the downlink measurement and control signal and the downlink communication signal do not interfere with each other, that is, the frequency interval is at least greater than half of the sum of the bandwidth of the downlink measurement and control signal and the bandwidth of the downlink communication signal.
The functional units of the capturing, loop tracking, demodulation and decoding, clock error resolving, satellite-borne measurement and control baseband and satellite-borne communication baseband in the embodiment of the invention can all follow the existing mature technology and method.
In the embodiment of the invention, the received communication signal is subjected to the received frequency offset compensation by using the downlink frequency offset resolving result, so that the received frequency offset required to be processed by the downlink communication signal can be reduced, and the complexity of a ground station receiver is reduced.
In the embodiment of the invention, the uplink frequency offset resolving result is utilized to carry out transmission frequency offset compensation on the transmission communication signal, so that the receiving frequency offset required to be processed by the uplink communication signal can be reduced, and the complexity of a satellite receiver is reduced.
Example 1
A measurement and control communication cooperative transmission method comprises an uplink transmission process and a downlink transmission process; a sending frequency offset compensation process for carrying out frequency offset compensation on a sending signal by using a sending frequency offset compensation value output by uplink frequency offset resolving is arranged in the communication uplink sending baseband processing in the uplink transmission process, and the frequency offset information of the communication uplink sending baseband processing is crosslinked with the measurement and control downlink receiving baseband processing by using the uplink frequency offset resolving; in the downlink transmission process, a receiving frequency offset compensation process for performing frequency offset compensation on a received signal by using a receiving frequency offset compensation value output by downlink frequency offset resolving is arranged in the processing of a communication downlink receiving baseband, and the frequency offset information of the communication downlink receiving baseband processing is crosslinked with the processing of a measurement and control downlink receiving baseband by using the downlink frequency offset resolving.
Example 2
On the basis of the embodiment 1, in the uplink transmission process, the method comprises the following substeps:
at a ground station, after being subjected to first coding modulation, framing and spread spectrum after the measurement and control information is packaged, the measurement and control information is converted into an uplink measurement and control intermediate frequency through first digital up-conversion; meanwhile, after the communication information is packaged, the communication information is subjected to second coding modulation, framing and sending frequency offset compensation, and then is subjected to second digital up-conversion and frequency conversion to an uplink communication intermediate frequency;
the uplink measurement and control intermediate frequency signal and the uplink communication intermediate frequency signal enter a DAC (digital-to-analog converter), a radio frequency sending channel, a duplexer and an antenna after being combined to realize uplink signal transmission;
in the satellite, the uplink signal respectively enters the satellite-borne measurement and control baseband and the satellite-borne communication baseband after passing through the antenna, the duplexer, the radio frequency receiving channel and the power divider to complete uplink processing.
Example 3
On the basis of the embodiment 1, in the downlink transmission process, the method comprises the following sub-steps:
downlink intermediate frequency signals processed by a satellite, a satellite-borne measurement and control baseband and a satellite-borne communication baseband realize downlink signal transmission through a combiner, a radio frequency transmission channel, a duplexer and an antenna;
at a ground station, downlink signals pass through an antenna, a duplexer, a radio frequency receiving channel, an ADC and a shunt circuit to obtain downlink measurement and control intermediate frequency signals and downlink communication intermediate frequency signals;
the downlink measurement and control intermediate frequency signal is subjected to a first digital filter, a first digital down-conversion, capturing, first loop tracking, first demodulation decoding and measurement and control information analysis to obtain downlink measurement and control information; meanwhile, downlink communication intermediate frequency signals are subjected to second digital filters, second digital down-conversion, downlink frequency offset calculation, receiving frequency offset compensation, second loop tracking, second demodulation decoding and communication information analysis to obtain downlink communication information.
Example 4
On the basis of embodiment 1 or embodiment 2, the transmission frequency offset compensation process includes the sub-steps of:
resolving frequency estimation value f output by capture by uplink frequency offset acq Clock error estimation value sigma of analysis output of measurement and control information s Preset downlink measurement and control radio frequency center frequency f dw_TTC And up communication radio frequency center frequency f up_COM Resolving to obtain a sending frequency offset compensation value f bias_up Designing a calculation formula of the transmitted frequency offset compensation value as follows:
example 5
On the basis of embodiment 1 or embodiment 3, the receiving frequency offset compensation process includes the sub-steps of:
downlink frequency offset resolving frequency estimation value f output by capture acq Preset downlink measurement and control radio frequency center frequency f dw_TTC And downlink communication radio frequency center frequency f dw_COM Resolving to obtain a receiving frequency offset compensation value f bias_dw Designing a calculation formula of the received frequency offset compensation value as follows:
example 6
On the basis of the embodiment 2 or the embodiment 3, the working frequency range supported by the antennas and duplexers of the ground station and the satellite is larger than the maximum frequency range occupied by the uplink and downlink measurement and control signals and the communication signals.
Example 7
On the basis of the embodiment 2, the working frequency range supported by the DAC and the radio frequency transmission channel of the ground station, the radio frequency reception channel of the satellite and the power divider is larger than the maximum frequency range occupied by the uplink measurement and control and communication signals.
Example 8
On the basis of embodiment 3, the working frequency range supported by the combiner and the radio frequency transmission channel of the satellite, the radio frequency reception channel of the ground station and the ADC is greater than the maximum frequency range occupied by the downlink measurement and control and communication signals.
Example 9
On the basis of the embodiment 2, the frequency interval between the uplink measurement and control intermediate frequency and the uplink communication intermediate frequency is at least more than half of the sum of the uplink measurement and control signal bandwidth and the uplink communication signal bandwidth; on the basis of embodiment 3, the frequency interval between the downlink measurement and control intermediate frequency and the downlink communication intermediate frequency is at least greater than half of the sum of the downlink measurement and control signal bandwidth and the downlink communication signal bandwidth.
Example 10
A measurement and control communication cooperative transmission system comprises a baseband processing device, a downlink frequency offset resolving unit, an uplink frequency offset resolving unit and front-end equipment, wherein the baseband processing device comprises a measurement and control downlink receiving baseband processing unit, a communication downlink receiving baseband processing unit, a measurement and control uplink sending baseband processing unit and a communication uplink sending baseband processing unit; the receiving frequency offset compensation unit is connected with the downlink frequency offset resolving unit, and the downlink frequency offset resolving unit is connected with a capture module of the measurement and control downlink receiving baseband processing unit; the system comprises a measurement and control downlink receiving baseband processing unit, a measurement and control uplink sending baseband processing unit, a communication downlink receiving baseband processing unit and a communication uplink sending baseband processing unit of the baseband processing device, and the front-end equipment is shared. In specific implementation, the front-end device includes an antenna, a duplexer, a radio frequency transmitting channel, a radio frequency receiving channel, etc., which can be implemented by using the prior art, but on the basis of the design of implementing baseband cross-linking by using the system structure, two sets of antennas and duplex devices independent in measurement and control and communication are avoided by using the common structural design of the front-end device, so that the system complexity when the measurement and control and communication coexist can be further reduced, and the implementation cost is reduced.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Other embodiments than the above examples may be devised by those skilled in the art based on the foregoing disclosure, or by adapting and using knowledge or techniques of the relevant art, and features of various embodiments may be interchanged or substituted and such modifications and variations that may be made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the following claims.
Claims (10)
1. A measurement and control communication cooperative transmission method is characterized by comprising an uplink transmission process and a downlink transmission process; a sending frequency offset compensation process for carrying out frequency offset compensation on a sending signal by using a sending frequency offset compensation value output by uplink frequency offset resolving is arranged in the communication uplink sending baseband processing in the uplink transmission process, and the frequency offset information of the communication uplink sending baseband processing is crosslinked with the measurement and control downlink receiving baseband processing by using the uplink frequency offset resolving; in the downlink transmission process, a receiving frequency offset compensation process for performing frequency offset compensation on a received signal by using a receiving frequency offset compensation value output by downlink frequency offset resolving is arranged in the processing of a communication downlink receiving baseband, and the frequency offset information of the communication downlink receiving baseband processing is crosslinked with the processing of a measurement and control downlink receiving baseband by using the downlink frequency offset resolving.
2. The measurement and control communication cooperative transmission method according to claim 1, wherein in the uplink transmission process, the measurement and control communication cooperative transmission method comprises the substeps of:
at a ground station, after being subjected to first coding modulation, framing and spread spectrum after the measurement and control information is packaged, the measurement and control information is converted into an uplink measurement and control intermediate frequency through first digital up-conversion; meanwhile, after the communication information is packaged, the communication information is subjected to second coding modulation, framing and sending frequency offset compensation, and then is subjected to second digital up-conversion and frequency conversion to an uplink communication intermediate frequency;
the uplink measurement and control intermediate frequency signal and the uplink communication intermediate frequency signal enter a DAC (digital-to-analog converter), a radio frequency sending channel, a duplexer and an antenna after being combined to realize uplink signal transmission;
in the satellite, the uplink signal respectively enters the satellite-borne measurement and control baseband and the satellite-borne communication baseband after passing through the antenna, the duplexer, the radio frequency receiving channel and the power divider to complete uplink processing.
3. The measurement and control communication cooperative transmission method according to claim 1, comprising the sub-steps of, during downlink transmission:
downlink intermediate frequency signals processed by a satellite, a satellite-borne measurement and control baseband and a satellite-borne communication baseband realize downlink signal transmission through a combiner, a radio frequency transmission channel, a duplexer and an antenna;
at a ground station, downlink signals pass through an antenna, a duplexer, a radio frequency receiving channel, an ADC and a shunt circuit to obtain downlink measurement and control intermediate frequency signals and downlink communication intermediate frequency signals;
the downlink measurement and control intermediate frequency signal is subjected to a first digital filter, a first digital down-conversion, capturing, first loop tracking, first demodulation decoding and measurement and control information analysis to obtain downlink measurement and control information; meanwhile, downlink communication intermediate frequency signals are subjected to second digital filters, second digital down-conversion, downlink frequency offset calculation, receiving frequency offset compensation, second loop tracking, second demodulation decoding and communication information analysis to obtain downlink communication information.
4. The measurement and control communication cooperative transmission method according to any one of claims 1 or 2, wherein the transmission frequency offset compensation process comprises the sub-steps of:
resolving frequency estimation value f output by capture by uplink frequency offset acq Clock error estimation value sigma of analysis output of measurement and control information s Preset downlink measurement and control radio frequency center frequency f dw_TTC And up communication radio frequency center frequency f up_COM Resolving to obtain a sending frequency offset compensation value f bias_up Designing a calculation formula of the transmitted frequency offset compensation value as follows:
5. the measurement and control communication cooperative transmission method according to any one of claims 1 or 3, wherein the receiving frequency offset compensation process comprises the sub-steps of:
downlink frequency offset resolving frequency estimation value f output by capture acq Preset downlink measurement and control radio frequency center frequency f dw_TTC And downlink communication radio frequency center frequency f dw_COM Resolving to obtain a receiving frequency offset compensation value f bias_dw Designing a calculation formula of the received frequency offset compensation value as follows:
6. the measurement and control communication cooperative transmission method according to any one of claims 2 or 3, wherein an operating frequency range supported by antennas and duplexers of the ground station and the satellite is larger than a maximum frequency range occupied by the uplink and downlink measurement and control and communication signals.
7. The measurement and control communication cooperative transmission method according to claim 2, wherein a DAC and a radio frequency transmission channel of the ground station, a radio frequency reception channel of the satellite, and a working frequency range supported by the power divider are larger than a maximum frequency range occupied by the uplink measurement and control and communication signal.
8. The measurement and control communication cooperative transmission method according to claim 3, wherein the working frequency range supported by the combiner and the radio frequency transmission channel of the satellite, the radio frequency reception channel of the ground station and the ADC is larger than the maximum frequency range occupied by the downlink measurement and control and communication signals.
9. The measurement and control communication cooperative transmission method according to claim 2, wherein a frequency interval between the uplink measurement and control intermediate frequency and the uplink communication intermediate frequency is at least greater than a half of a sum of an uplink measurement and control signal bandwidth and an uplink communication signal bandwidth; the frequency interval between the downlink measurement and control intermediate frequency and the downlink communication intermediate frequency is at least more than half of the sum of the downlink measurement and control signal bandwidth and the downlink communication signal bandwidth.
10. A measurement and control communication cooperative transmission system is characterized by comprising a baseband processing device, a downlink frequency offset resolving unit, an uplink frequency offset resolving unit and front-end equipment, wherein the baseband processing device comprises a measurement and control downlink receiving baseband processing unit, a communication downlink receiving baseband processing unit, a measurement and control uplink sending baseband processing unit and a communication uplink sending baseband processing unit; the receiving frequency offset compensation unit is connected with the downlink frequency offset resolving unit, and the downlink frequency offset resolving unit is connected with a capture module of the measurement and control downlink receiving baseband processing unit;
the system comprises a measurement and control downlink receiving baseband processing unit, a measurement and control uplink sending baseband processing unit, a communication downlink receiving baseband processing unit and a communication uplink sending baseband processing unit of the baseband processing device, and the front-end equipment is shared.
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