CN114884559B - Coordinated transmission method and system for measurement and control communication - Google Patents
Coordinated transmission method and system for measurement and control communication Download PDFInfo
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- CN114884559B CN114884559B CN202210394933.8A CN202210394933A CN114884559B CN 114884559 B CN114884559 B CN 114884559B CN 202210394933 A CN202210394933 A CN 202210394933A CN 114884559 B CN114884559 B CN 114884559B
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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 coordinated transmission method and a coordinated transmission system for measurement and control communication, which belong to the field of measurement and control communication and comprise an uplink transmission process and a downlink transmission process; a transmission frequency offset compensation process for performing frequency offset compensation on the communication uplink transmission signal by using a transmission frequency offset compensation value output by uplink frequency offset calculation 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 utilizing the receiving frequency offset compensation value output by the downlink frequency offset calculation 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 the transmission and reception of the communication signal assisted by measurement and control information.
Description
Technical Field
The invention relates to the field of measurement and control communication, in particular to a cooperative transmission method and a cooperative transmission system for measurement and control communication.
Background
The traditional aerospace measurement and control system and the satellite communication system are designed independently and are deployed independently due to the fact that the types of bearing services are large in difference due to the fact that service objects are different at the beginning of design. Along with the increasing demands of low-orbit satellite communication constellation construction, on one hand, a large number of gateway stations are required to be constructed for the 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 the daily management and control of large-scale low-orbit satellites. The scheme of independent construction of the existing aerospace measurement and control system and the satellite communication system brings great cost pressure to large-scale low-orbit satellite constellation construction.
In order to reduce the construction cost, the common knowledge in the industry at present is to uniformly construct a gateway station and a measurement and control station, and a set of ground stations have 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.
A measurement and control communication simultaneous transmission scheme is that co-station and non-co-equipment are transmitted. Because of different service types and transmission rate requirements, the measurement and the communication are generally transmitted in different frequency bands, for example, the measurement and the measurement are performed in an S frequency band, the communication is performed in a Ka frequency band, the transmission scheme of the co-station and the non-co-equipment requires that independent antenna, channel and baseband equipment are configured for the measurement and the communication functions, the complexity of system equipment is high, and a plurality of frequency bands are occupied.
Another measurement and control communication simultaneous transmission scheme is co-equipment co-signal transmission. For the scene with low requirement on the transmission rate of communication, unified design can be carried out on measurement and control and communication on the transmission signal, unbalanced QPSK signals are adopted, the code rate of I, Q branches is the same but the information rate is different, the I branch focuses on the communication function, and the information rate is between a few kbps and tens of Mbps; the Q branch is focused on the measurement and control function, and the modulated information rate is low. The scheme not only can multiplex transmission equipment such as antennas, channels, baseband and the like, but also realizes signal layer fusion of measurement and control and communication. However, the requirements of the new generation of low orbit satellites on the communication transmission rate reach the upper Gbps, and the existing scheme cannot support such high data transmission rate and cannot be compatible with the prior art system and baseband equipment.
Therefore, the prior art cannot meet the requirements of large-scale low-orbit constellation measurement and control communication co-station construction and simultaneous transmission, and a new low-complexity measurement and control communication transmission method is necessary to be provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a coordinated transmission method and a coordinated transmission system for measurement and control communication, which can realize measurement and control and communication transmission resource sharing while being compatible with the existing measurement and control communication transmission system, and effectively reduce the implementation complexity of a ground station and a satellite receiver by assisting communication signal reception through measurement and control information.
The invention aims at realizing the following scheme:
a coordinated transmission method for measurement and control communication comprises an uplink transmission process and a downlink transmission process; a transmission frequency offset compensation process for performing frequency offset compensation on a transmission signal by using a transmission frequency offset compensation value output by uplink frequency offset calculation is arranged in communication uplink transmission baseband processing in the uplink transmission process, and frequency offset information of communication uplink transmission baseband processing and measurement and control downlink receiving baseband processing are crosslinked by using uplink frequency offset calculation; and a receiving frequency offset compensation process for performing frequency offset compensation on the received signal by using a receiving frequency offset compensation value output by downlink frequency offset calculation is arranged in the communication downlink receiving baseband processing in the downlink transmission process, and the frequency offset information of the communication downlink receiving baseband processing is crosslinked with the measurement and control downlink receiving baseband processing by using the downlink frequency offset calculation.
Further, in the uplink transmission process, the method includes the following sub steps:
after the measurement and control information is packed in a ground station and subjected to first code modulation, framing and spread spectrum, the measurement and control information is subjected to first digital up-conversion and frequency conversion to an uplink measurement and control intermediate frequency; meanwhile, after the communication information is packed, the communication information is subjected to second code modulation, framing and frequency offset compensation, and 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 transmission channel, a duplexer and an antenna after being combined to realize uplink signal transmission;
in the satellite, the uplink signal enters the satellite measurement and control baseband and the satellite communication baseband respectively after passing through the antenna, the duplexer, the radio frequency receiving channel and the power divider to finish uplink processing.
Further, in the downlink transmission process, the method includes the following sub steps:
the method comprises the steps that 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;
in a ground station, a downlink measurement and control intermediate frequency signal and a downlink communication intermediate frequency signal are obtained after downlink signals pass through an antenna, a duplexer, a radio frequency receiving channel, an ADC and a shunt;
the downlink measurement and control intermediate frequency signal is subjected to a first digital filter, a first digital down-conversion, acquisition, a first loop tracking, a first demodulation decoding and measurement and control information analysis to obtain downlink measurement and control information; meanwhile, the downlink communication intermediate frequency signal passes through a second digital filter, a second digital down-conversion, a downlink frequency offset calculation, a receiving frequency offset compensation, a second loop tracking, a second demodulation decoding and communication information analysis to obtain downlink communication information.
Further, the transmission frequency offset compensation process includes the sub-steps of:
frequency estimation value f output by capturing for upstream frequency offset calculation acq Clock error estimation value sigma of measurement and control information analysis output s Preset downlink measurement and control radio frequency center frequency f dw_TTC And an uplink communication radio frequency center frequency f up_COM Obtaining a transmission frequency offset compensation value f by means of solution bias_up The following calculation formula of the frequency offset compensation value is designed:
further, the receiving frequency offset compensation process comprises the following sub-steps:
frequency estimation value f output by capturing is calculated by downlink frequency offset acq Preset downlink measurement and control radio frequency center frequency f dw_TTC And a downlink communication radio frequency center frequency f dw_COM The received frequency offset compensation value f is obtained through solution bias_dw The following receiving frequency offset compensation value calculation formula is designed:
further, the working frequency range supported by the antennas of the ground station and the satellite and the duplexer is larger than the maximum frequency range occupied by the uplink and downlink measurement and control and communication signals.
Further, the DAC and the radio frequency transmitting channel of the ground station, the radio frequency receiving channel of the satellite and the working frequency range supported by the power divider are larger than the maximum frequency range occupied by the uplink measurement and control and communication signals.
Further, the working frequency ranges supported by the combiner and the radio frequency transmitting channel of the satellite, the radio frequency receiving channel of the ground station and the ADC are larger than the maximum frequency range occupied by the downlink measurement and control and communication signals.
Further, the frequency interval between the uplink measurement and control intermediate frequency and the uplink communication intermediate frequency 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 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 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 transmitting baseband processing unit and a communication uplink transmitting baseband processing unit, the communication downlink receiving baseband processing unit is provided with a receiving frequency offset compensating unit, the communication uplink transmitting baseband processing unit is provided with a transmitting frequency offset compensating unit, the transmitting frequency offset compensating unit is connected with the uplink frequency offset resolving unit, and the uplink frequency offset resolving unit is connected with a capturing module of the measurement and control downlink receiving baseband processing unit; the receiving frequency offset compensation unit is connected with the downlink frequency offset calculation unit, and the downlink frequency offset calculation unit is connected with the capturing module of the measurement and control downlink receiving baseband processing unit; and the front-end equipment is shared by 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.
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 assists communication signal receiving through measurement and control information, thereby effectively reducing the realization complexity of a ground station and a satellite receiver. Specifically, through the baseband cross-linking design, the frequency offset calculation unit is utilized to realize the frequency offset information sharing 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 of the communication baseband to be processed is reduced, and the implementation complexity of the communication baseband is reduced. Furthermore, on the basis of baseband cross-linking design, through the common design of front-end equipment such as antenna and duplexer, two sets of independent antenna and duplex equipment of measurement and control and communication have been avoided, the equipment integration level has been promoted, the system complexity when further reducing measurement and control and communication coexistence has reduced the implementation cost.
In the embodiment of the invention, the receiving frequency offset compensation is carried out on the received communication signal by utilizing the downlink frequency offset calculation result, so that the receiving frequency offset required to be processed on 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 calculation result is utilized to carry out the 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 the satellite receiver is reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of an implementation principle of a ground station in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the implementation principle of a satellite in an embodiment of the invention;
fig. 3 is a schematic diagram of a downlink frequency offset calculation unit in fig. 1;
fig. 4 is a schematic diagram of the uplink frequency offset calculation unit in fig. 1.
Detailed Description
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
As shown in fig. 1 and fig. 2, the embodiment of the invention provides a coordinated transmission method for measurement and control communication, which comprises an uplink transmission part and a downlink transmission part.
The specific steps of uplink transmission include:
at the ground station:
after the measurement and control information is packed, the uplink measurement and control intermediate frequency signal is obtained by carrying out coding modulation 1, framing and spread spectrum and then carrying out digital up-conversion 1 frequency conversion to the uplink measurement and control intermediate frequency.
After the communication information is packed, the communication information is subjected to code modulation 2, framing and frequency offset compensation, and is subjected to digital up-conversion 2 to be converted into an uplink communication intermediate frequency to obtain an uplink communication intermediate frequency signal.
The uplink measurement and control intermediate frequency signal and the uplink communication intermediate frequency signal enter a DAC, a radio frequency transmission channel, a duplexer and an antenna after digital combination, so that uplink wireless signal transmission is realized.
At satellite:
after the uplink wireless signal is received by an antenna, the uplink wireless signal sequentially enters a duplexer, a radio frequency receiving channel and a power divider, and the power divider performs power division to obtain two paths of uplink intermediate frequency signals;
and the two paths of uplink intermediate frequency signals respectively enter a satellite-borne measurement and control baseband and a satellite-borne communication baseband to finish uplink measurement and control and communication processing so as to obtain uplink measurement and control information and uplink communication information.
The specific steps for downlink transmission include:
at satellite:
the measurement and control information and the communication information are processed by a satellite-borne measurement and control baseband and a satellite-borne communication baseband 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 a combiner to obtain a downlink intermediate frequency signal, and the downlink intermediate frequency signal sequentially enters a radio frequency transmission channel, a duplexer and an antenna to realize downlink wireless signal transmission.
At the ground station:
after the downlink wireless signal is received by an antenna, the downlink wireless signal sequentially enters a duplexer, a radio frequency receiving channel, an ADC and a digital shunt 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 downlink transmission, the downlink frequency offset resolving unit is composed of a capturing unitOutput frequency estimate f acq Preset downlink measurement and control radio frequency center frequency f dw_TTC And a downlink communication radio frequency center frequency f dw_COM The received frequency offset compensation value f is obtained through solution bias_dw The calculation formula of the received frequency offset compensation value is as follows:
as shown in fig. 4, in the uplink transmission, the uplink frequency offset calculating unit outputs the frequency estimated value f from the capturing unit acq Clock error estimated value sigma outputted by measurement and control information analysis unit s Preset downlink measurement and control radio frequency center frequency f dw_TTC And an uplink communication radio frequency center frequency f up_COM Obtaining a transmission frequency offset compensation value f by means of solution 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 of the ground station and the satellite and the duplexer is larger than the maximum frequency range occupied by uplink and downlink measurement and control and communication signals.
The DAC and the radio frequency transmitting channel of the ground station, the radio frequency receiving channel of the satellite and the working frequency range supported by the power divider are larger than the maximum frequency range occupied by the uplink measurement and control and communication signals.
The working frequency ranges supported by the combiner and the radio frequency transmitting channel of the satellite, the radio frequency receiving channel of the ground station and the ADC are 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 should ensure that the uplink measurement and control signal and the uplink communication signal do not interfere with each other, i.e. 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 should ensure that the downlink measurement and control signal and the downlink communication signal do not interfere with each other, i.e. 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 capturing, loop tracking, demodulation and decoding, clock difference resolving, satellite-borne measurement and control baseband and satellite-borne communication baseband function units in the embodiment of the invention can all adopt the existing mature technology and method.
In the embodiment of the invention, the receiving frequency offset compensation is carried out on the received communication signal by utilizing the downlink frequency offset calculation result, so that the receiving frequency offset required to be processed on 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 calculation result is utilized to carry out the 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 the satellite receiver is reduced.
Example 1
A coordinated transmission method for measurement and control communication comprises an uplink transmission process and a downlink transmission process; a transmission frequency offset compensation process for performing frequency offset compensation on a transmission signal by using a transmission frequency offset compensation value output by uplink frequency offset calculation is arranged in communication uplink transmission baseband processing in the uplink transmission process, and frequency offset information of communication uplink transmission baseband processing and measurement and control downlink receiving baseband processing are crosslinked by using uplink frequency offset calculation; and a receiving frequency offset compensation process for performing frequency offset compensation on the received signal by using a receiving frequency offset compensation value output by downlink frequency offset calculation is arranged in the communication downlink receiving baseband processing in the downlink transmission process, and the frequency offset information of the communication downlink receiving baseband processing is crosslinked with the measurement and control downlink receiving baseband processing by using the downlink frequency offset calculation.
Example 2
On the basis of embodiment 1, in the uplink transmission process, the method includes the following sub-steps:
after the measurement and control information is packed in a ground station and subjected to first code modulation, framing and spread spectrum, the measurement and control information is subjected to first digital up-conversion and frequency conversion to an uplink measurement and control intermediate frequency; meanwhile, after the communication information is packed, the communication information is subjected to second code modulation, framing and frequency offset compensation, and 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 transmission channel, a duplexer and an antenna after being combined to realize uplink signal transmission;
in the satellite, the uplink signal enters the satellite measurement and control baseband and the satellite communication baseband respectively after passing through the antenna, the duplexer, the radio frequency receiving channel and the power divider to finish uplink processing.
Example 3
On the basis of embodiment 1, in the downlink transmission process, the method includes the following sub-steps:
the method comprises the steps that 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;
in a ground station, a downlink measurement and control intermediate frequency signal and a downlink communication intermediate frequency signal are obtained after downlink signals pass through an antenna, a duplexer, a radio frequency receiving channel, an ADC and a shunt;
the downlink measurement and control intermediate frequency signal is subjected to a first digital filter, a first digital down-conversion, acquisition, a first loop tracking, a first demodulation decoding and measurement and control information analysis to obtain downlink measurement and control information; meanwhile, the downlink communication intermediate frequency signal passes through a second digital filter, a second digital down-conversion, a downlink frequency offset calculation, a receiving frequency offset compensation, a second loop tracking, a 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:
frequency estimation value f output by capturing for upstream frequency offset calculation acq Clock error estimation value sigma of measurement and control information analysis output s Preset downlink measurement and control radio frequency center frequency f dw_TTC And an uplink communication radio frequency center frequency f up_COM Obtaining a transmission frequency offset compensation value f by means of solution bias_up The following calculation formula of the frequency offset compensation value is designed:
example 5
On the basis of embodiment 1 or embodiment 3, the received frequency offset compensation process includes the sub-steps of:
frequency estimation value f output by capturing is calculated by downlink frequency offset acq Preset downlink measurement and control radio frequency center frequency f dw_TTC And a downlink communication radio frequency center frequency f dw_COM The received frequency offset compensation value f is obtained through solution bias_dw The following receiving frequency offset compensation value calculation formula is designed:
example 6
Based on embodiment 2 or embodiment 3, the antenna and the diplexer of the ground station and the satellite support a working frequency range greater than the maximum frequency range occupied by uplink and downlink measurement and control and communication signals.
Example 7
Based on embodiment 2, the DAC and the rf transmit channels of the ground station, the rf receive channels of the satellite and the power divider support a working frequency range that is greater than the maximum frequency range occupied by the uplink measurement and control and communication signals.
Example 8
Based on embodiment 3, the working frequency ranges supported by the combiner and the radio frequency transmitting channel of the satellite, the radio frequency receiving channel of the ground station and the ADC are larger than the maximum frequency range occupied by the downlink measurement and control and communication signals.
Example 9
Based on the embodiment 2, the frequency interval between the uplink measurement and control intermediate frequency and the uplink communication intermediate frequency 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; based on 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 bandwidth of the downlink measurement and control signal and the bandwidth of the downlink communication signal.
Example 10
The 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 transmitting baseband processing unit and a communication uplink transmitting baseband processing unit, the communication downlink receiving baseband processing unit is provided with a receiving frequency offset compensating unit, the communication uplink transmitting baseband processing unit is provided with a transmitting frequency offset compensating unit, the transmitting frequency offset compensating unit is connected with the uplink frequency offset resolving unit, and the uplink frequency offset resolving unit is connected with a capturing module of the measurement and control downlink receiving baseband processing unit; the receiving frequency offset compensation unit is connected with the downlink frequency offset calculation unit, and the downlink frequency offset calculation unit is connected with the capturing module of the measurement and control downlink receiving baseband processing unit; and the front-end equipment is shared by 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. In the implementation, the front-end equipment comprises an antenna, a duplexer, a radio frequency transmitting channel, a radio frequency receiving channel and the like, which can be realized by adopting the prior art, but on the basis of the design of realizing baseband cross-linking by the system structure, two sets of antenna and duplex equipment which are independent in measurement and control and communication are avoided by the common structural design of the front-end equipment, so that the system complexity in the coexistence of measurement and control and communication can be further reduced, and the realization cost is reduced.
The invention is not related in part to the same as or can be practiced with the prior art.
In addition to the foregoing examples, those skilled in the art will recognize from the foregoing disclosure that other embodiments can be made and in which various features of the embodiments can be interchanged or substituted, and that such modifications and changes can be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A coordinated transmission method for measurement and control communication is characterized by comprising an uplink transmission process and a downlink transmission process; a transmission frequency offset compensation process for performing frequency offset compensation on a transmission signal by using a transmission frequency offset compensation value output by uplink frequency offset calculation is arranged in communication uplink transmission baseband processing in the uplink transmission process, and frequency offset information of communication uplink transmission baseband processing and measurement and control downlink receiving baseband processing are crosslinked by using uplink frequency offset calculation; a receiving frequency offset compensation process for performing frequency offset compensation on the received signal by utilizing a receiving frequency offset compensation value output by downlink frequency offset calculation is arranged in the communication downlink receiving baseband processing in the downlink transmission process, and the frequency offset information processed by the communication downlink receiving baseband is crosslinked with the measurement and control downlink receiving baseband processing by utilizing the downlink frequency offset calculation;
the transmission frequency offset compensation process comprises the following substeps:
frequency estimation value f output by capturing for upstream frequency offset calculation acq Clock error estimation value sigma of measurement and control information analysis output s Preset downlink measurement and control radio frequency center frequency f dw_TTC And an uplink communication radio frequency center frequency f up_COM Obtaining a transmission frequency offset compensation value f by means of solution bias_up The following calculation formula of the frequency offset compensation value is designed:
2. the coordinated transmission method for measurement and control communication according to claim 1, characterized in that in the uplink transmission process, it comprises the sub-steps of:
after the measurement and control information is packed in a ground station and subjected to first code modulation, framing and spread spectrum, the measurement and control information is subjected to first digital up-conversion and frequency conversion to an uplink measurement and control intermediate frequency; meanwhile, after the communication information is packed, the communication information is subjected to second code modulation, framing and frequency offset compensation, and 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 transmission channel, a duplexer and an antenna after being combined to realize uplink signal transmission;
in the satellite, the uplink signal enters the satellite measurement and control baseband and the satellite communication baseband respectively after passing through the antenna, the duplexer, the radio frequency receiving channel and the power divider to finish uplink processing.
3. The cooperative transmission method of measurement and control communication according to claim 1, wherein in the downlink transmission process, the method comprises the following sub steps:
the method comprises the steps that 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;
in a ground station, a downlink measurement and control intermediate frequency signal and a downlink communication intermediate frequency signal are obtained after downlink signals pass through an antenna, a duplexer, a radio frequency receiving channel, an ADC and a shunt;
the downlink measurement and control intermediate frequency signal is subjected to a first digital filter, a first digital down-conversion, acquisition, a first loop tracking, a first demodulation decoding and measurement and control information analysis to obtain downlink measurement and control information; meanwhile, the downlink communication intermediate frequency signal passes through a second digital filter, a second digital down-conversion, a downlink frequency offset calculation, a receiving frequency offset compensation, a second loop tracking, a second demodulation decoding and communication information analysis to obtain downlink communication information.
4. A coordinated transmission method for measurement and control communication according to any one of claims 1 or 3, wherein the received frequency offset compensation process comprises the sub-steps of:
frequency estimation value f output by capturing is calculated by downlink frequency offset acq Preset downlink measurement and control radio frequency center frequency f dw_TTC And a downlink communication radio frequency center frequency f dw_COM The received frequency offset compensation value f is obtained through solution bias_dw The following receiving frequency offset compensation value calculation formula is designed:
5. a coordinated transmission method for measurement and control communication according to any one of claims 2 or 3, wherein the operating frequency range supported by the antennas and diplexers of the ground station and satellite is greater than the maximum frequency range occupied by the uplink and downlink measurement and control and communication signals.
6. The cooperative transmission method of measurement and control communication according to claim 2, wherein the operating frequency ranges supported by the DAC and the radio frequency transmission channel of the ground station, the radio frequency receiving channel of the satellite and the power divider are larger than the maximum frequency range occupied by the uplink measurement and control and communication signals.
7. The cooperative transmission method of measurement and control communication according to claim 3, wherein the working frequency ranges supported by the combiner and the radio frequency transmitting channel of the satellite, the radio frequency receiving channel of the ground station and the ADC are larger than the maximum frequency range occupied by the downlink measurement and control and communication signals.
8. The cooperative transmission method of measurement and control communication according to claim 2, wherein a frequency interval between an uplink measurement and control intermediate frequency and an uplink communication intermediate frequency is at least greater than 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 greater than half of the sum of the bandwidth of the downlink measurement and control signal and the bandwidth of the downlink communication signal.
9. The measurement and control communication cooperative transmission system is characterized by further 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 transmitting baseband processing unit and a communication uplink transmitting baseband processing unit, the communication downlink receiving baseband processing unit is provided with a receiving frequency offset compensating unit, the communication uplink transmitting baseband processing unit is provided with a transmitting frequency offset compensating unit, the transmitting frequency offset compensating unit is connected with the uplink frequency offset resolving unit, and the uplink frequency offset resolving unit is connected with a capturing module of the measurement and control downlink receiving baseband processing unit; the receiving frequency offset compensation unit is connected with the downlink frequency offset calculation unit, and the downlink frequency offset calculation unit is connected with the capturing module of the measurement and control downlink receiving baseband processing unit;
and the front-end equipment is shared by 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.
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