CN110708111B - Inter-satellite adaptive communication system and communication method thereof - Google Patents
Inter-satellite adaptive communication system and communication method thereof Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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Abstract
The invention discloses an inter-satellite adaptive communication system and a communication method thereof. The system comprises: the system comprises a ranging communication module and an adaptive control module; the distance measurement communication module is used for receiving, transmitting and analyzing an inter-satellite distance measurement signal and an inter-satellite communication signal and comprises an SX1280 chip unit, a transmitting channel unit, a receiving channel unit, a microwave switch and an antenna unit; the self-adaptive control module is connected with the ranging communication module and is used for configuring and controlling the working mode, the communication code and the communication rate of the ranging communication module. According to the inter-satellite adaptive communication system and the communication method thereof, the ranging communication module provided with the SX1280 chip unit is utilized, so that the inter-satellite ranging and inter-satellite communication functions can be realized, the inter-satellite ranging and the inter-satellite communication can be realized only by configuring parameters of the ranging communication module, independent development work is not needed, and the design and development are simple; and the adaptive configuration can be carried out according to the inter-satellite distance measurement result, so that the utilization rate of on-satellite energy is improved.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to an inter-satellite adaptive communication system and a communication method thereof.
Background
The cooperative completion of a specific task by using multiple satellites is one of the main modes of satellite application, and has wide application in both military and aerospace fields, such as university sodium satellite program supported by the U.S. department of defense and the U.S. national aerospace agency, and grace (gravity Recovery and design expert) earth gravity field inversion system cooperated with the U.S. national aerospace agency and the germany aviation center.
The inter-satellite communication technology is a supporting technology for the cooperative work of a plurality of satellites, and the inter-satellite communication technology carries out cooperative control and information fusion of the plurality of satellites by utilizing inter-satellite communication links to exchange time, position and load information among the satellites. The existing inter-satellite communication is mainly specially designed, the development period is long, and the development cost is high; for example, chinese patent document with publication number CN108120973A and name "an inter-satellite communication ranging system" discloses an inter-satellite communication ranging system, which is composed of a measurement and control communication module and a directional ranging module, the measurement and control communication module is used for transmitting, updating and storing information in a constellation, the directional ranging module adopts a frequency division duplex mode, the measurement and control communication module obtains the state of a satellite pair needing communication, the directional ranging module configures the satellites in the satellite pair under the control of the measurement and control communication module, so that the two satellites have different working modes, and a ranging link is established between each satellite pair to complete ranging. Although this inter-satellite communication ranging system can realize observing and controling communication and accurate range finding function, observe and control communication module and directional ranging module and need additionally develop, and the structure is complicated, leads to this inter-satellite communication ranging system's system complexity height, and development is consuming time many, and development cost is high, is difficult to use widely.
Therefore, developing an inter-satellite communication system and a communication method thereof, which have simple structure and low development cost and can be popularized and used and can realize measurement and control communication and accurate ranging functions, becomes a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides an inter-satellite adaptive communication system and a communication method thereof.
To this end, the invention discloses an inter-satellite adaptive communication system, which is installed on a satellite-borne platform of a satellite, and comprises: the system comprises a ranging communication module and an adaptive control module;
the distance measurement communication module is used for receiving, transmitting and analyzing an inter-satellite distance measurement signal and an inter-satellite communication signal and comprises an SX1280 chip unit, a transmitting channel unit, a receiving channel unit, a microwave switch and an antenna unit; the SX1280 chip unit is respectively connected with the input end of the transmitting channel unit and the output end of the receiving channel unit, the output end of the transmitting channel unit is connected with the input end of the microwave switch, the input end of the receiving channel unit is connected with the output end of the microwave switch, and the transmitting end of the microwave switch is connected with the antenna unit;
the self-adaptive control module is connected with the ranging communication module and is used for configuring and controlling the working mode, the communication code and the communication rate of the ranging communication module.
Further, in the inter-satellite adaptive communication system, the SX1280 chip unit is an SX1280 radio frequency chip adopting a Lora modulation mode, and the SX1280 chip unit is connected to the adaptive control module through a serial peripheral interface.
Further, in the inter-satellite adaptive communication system, the SX1280 chip unit and the adaptive control module are further connected with each other through two connecting wires, two the connecting wires include reset line and state line, the adaptive control module passes through the reset line is right the SX1280 chip unit carries out reset control, the SX1280 chip unit passes through the state line is to adaptive control module transmission operating condition information.
Further, in the inter-satellite adaptive communication system, the transmitting channel unit and the receiving channel unit are both connected with the SX1280 chip unit through radio frequency cables.
Further, in the inter-satellite adaptive communication system, the transmitting channel unit and the receiving channel unit are both connected to the microwave switch through a radio frequency cable.
Further, in the inter-satellite adaptive communication system, the microwave switch is connected to the antenna unit through a radio frequency cable.
Further, in the inter-satellite adaptive communication system, the adaptive control module is a 51-series single chip microcomputer.
In addition, the invention also discloses a communication method implemented by using the inter-satellite adaptive communication system, and the communication method comprises the following steps:
1) the adaptive control module configures the ranging communication module to a ranging mode;
2) the ranging communication module is used for carrying out inter-satellite ranging;
3) the self-adaptive control module carries out inter-satellite link budget according to the inter-satellite distance measurement result of the distance measurement communication module;
4) the self-adaptive control module determines the communication code and the communication rate of the ranging communication module according to the inter-satellite link budget result;
5) the self-adaptive control module configures the ranging communication module according to the determined communication code and the communication rate;
6) the ranging communication module is used for inter-planet communication.
Further, in the communication method, the step 1) includes:
configuring the SX1280 chip unit into a ranging engine mode;
configuring the SX1280 chip unit into a master-slave mode;
and configuring the emission power of the SX1280 chip unit to be the maximum value.
Further, in the communication method, the inter-satellite link budget result is determined by using formula 1;
wherein, PrRepresenting the inter-satellite link budget result, PtRepresents the output power, G, of the SX1280 chip unittRepresents the transmission gain of the transmission channel unit, AtRepresents the transmission gain of the antenna element, ArThe receiving gain of the antenna unit is represented, pi represents a circumference ratio, f represents the signal frequency of a radio frequency signal sent by the SX1280 chip unit, d represents a registered distance value of the SX1280 chip unit, and c represents the speed of light.
According to the inter-satellite adaptive communication system and the inter-satellite adaptive communication method, the ranging communication module provided with the SX1280 chip unit is utilized, so that the inter-satellite ranging and inter-satellite communication functions can be realized, and the inter-satellite ranging and inter-satellite communication can be realized only by configuring parameters of the ranging communication module without independent development work, so that the inter-satellite adaptive communication system and the inter-satellite adaptive communication method are simple in structure, simple in design and development, small in size, low in energy consumption and high in sensitivity; meanwhile, adaptive configuration of communication coding and communication rate can be carried out according to an actual inter-satellite distance measurement result, the utilization rate of on-satellite energy is effectively improved, and on-satellite energy is saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an inter-satellite adaptive communication system according to an embodiment of the present invention;
fig. 2 is a flow chart of a communication method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides an inter-satellite adaptive communication system, which is installed on a satellite-borne platform of a satellite, and includes: the system comprises a ranging communication module and an adaptive control module; the distance measurement communication module is used for receiving, transmitting and analyzing an inter-satellite distance measurement signal and an inter-satellite communication signal and comprises an SX1280 chip unit, a transmitting channel unit, a receiving channel unit, a microwave switch and an antenna unit; the SX1280 chip unit is respectively connected with the input end of the transmitting channel unit and the output end of the receiving channel unit, the output end of the transmitting channel unit is connected with the input end of the microwave switch, the input end of the receiving channel unit is connected with the output end of the microwave switch, and the transmitting end of the microwave switch is connected with the antenna unit; the self-adaptive control module is connected with the ranging communication module and is used for configuring and controlling the working mode, the communication code and the communication rate of the ranging communication module.
The following describes the structure and the operation principle of the inter-satellite adaptive communication system provided by the embodiment of the present invention.
When the inter-satellite adaptive communication system provided by the embodiment of the invention is used, the adaptive control module configures the ranging communication module into a ranging mode, specifically configures an SX1280 chip unit in the ranging communication module into a ranging engine mode and a master-slave mode, and configures the transmitting power of the SX1280 chip unit into a maximum value; at the moment, the antenna unit receives ranging signals from other satellites and sends the received ranging signals to the receiving channel unit through the microwave switch, the receiving channel unit receives the ranging signals from the microwave switch, the ranging signals are filtered and then sent to the SX1280 chip unit, and the SX1280 chip unit analyzes the received ranging signals and determines the distance between the satellite and other satellites needing to be subjected to inter-satellite communication so as to finish inter-satellite ranging; the self-adaptive control module performs inter-satellite link budget according to the determined actual distance value and configures the ranging communication module according to the inter-satellite link budget result; specifically, specific parameter values of a communication code and a communication rate of an SX1280 chip unit are determined according to an inter-satellite link budget result, the SX1280 chip unit is configured based on the obtained specific parameter values of the communication code and the communication rate, and a configured distance measurement communication module enters a communication mode and starts inter-satellite communication; at this time, when the satellite needs to acquire information of other satellites, the antenna unit receives communication signals from other satellites and sends the received communication signals to the receiving channel unit through the microwave switch, the receiving channel unit filters the communication signals and then sends the communication signals to the SX1280 chip unit, and the SX1280 chip unit analyzes and processes the received communication signals to acquire the information of other satellites; when this satellite needs to send self information to other satellites, SX1280 chip unit sends the communication signal who has specific information to the transmission channel unit, and transmission channel unit sends to the microwave switch after enlargiing and filtering communication signal, and the microwave switch sends received communication signal to antenna element, and antenna element sends communication signal to other satellites.
Specifically, in the embodiment of the present invention, the SX1280 chip unit may be an SX1280 radio frequency chip adopting a Lora modulation mode, and the SX1280 chip unit is connected to the adaptive control module through a Serial Peripheral Interface (SPI).
So set up, adaptive control module can carry out accurate control through SPI interface to ranging communication module's mode of operation, communication code and communication rate to can read the actual distance value of registering in the inside address register of SX1280 chip unit through the SPI interface.
Furthermore, the control of the ranging communication module by the adaptive control module is facilitated, and the reliability of the inter-satellite adaptive communication system is ensured; in the embodiment of the invention, the SX1280 chip unit and the adaptive control module are further connected with each other through two connecting wires, the two connecting wires comprise the reset wire and the state wire, the adaptive control module performs reset control on the SX1280 chip unit through the reset wire, and the SX1280 chip unit sends working state information to the adaptive control module through the state wire.
Specifically, when the level input to the SX1280 chip unit by the adaptive control module through the reset line is a high level, the SX1280 chip unit is reset; when the level input to the adaptive control module by the SX1280 chip unit through the state line is a low level, the SX1280 chip unit is in an idle state, and when the level input to the adaptive control module by the SX1280 chip unit through the state line is a high level, the SX1280 chip unit is in a working state.
Further, in the embodiment of the present invention, the transmitting channel unit and the receiving channel unit may both be connected to the SX1280 chip unit through a radio frequency cable; the transmitting channel unit and the receiving channel unit can be both connected with the microwave switch through radio frequency cables; wherein, the interface of the radio frequency cable can be an SMA interface.
In the embodiment of the present invention, the transmission channel unit may include an amplifier and a filter, and the transmission gain of the transmission channel unit may be 20 dB; the receiving channel unit may include a filter, and the filter bandwidth of the receiving channel unit may be 2MHz and the center frequency may be 2.4 GHz.
Further, in the embodiment of the present invention, the microwave switch may be connected to the antenna unit through a radio frequency cable, and an interface of the radio frequency cable may be an SMA interface.
The microwave switch is used for switching the state of the receiving and transmitting signals of the ranging communication module; specifically, the microwave switch may be controlled by the adaptive control module through a control signal, for example, when the microwave switch receives a control signal from the adaptive control module at a high level, the microwave switch is communicated with the transmitting channel unit, and at this time, the ranging communication module operates in a transmitting state; when the microwave switch receives the control signal from the adaptive control module and is at a low level, the microwave switch is communicated with the receiving channel unit, and the ranging communication module works in a receiving state at the moment.
In the embodiment of the invention, in order to facilitate inter-satellite distance measurement and inter-satellite communication, the installation position of the antenna unit can be determined according to the relative position relationship between the satellite and other satellites needing inter-satellite communication; preferably, the antenna unit may be a ground nulling antenna to reduce the effect from ground interference signals.
Further, in the embodiment of the present invention, the adaptive control module may be a 51-series single chip microcomputer, and specifically may be a 51-series single chip microcomputer C8051F 040; because the 51-series singlechip C8051F040 is provided with a local area network (CAN2.0B) controller, the controller CAN be connected with satellite housekeeping through a CAN interface, and the data and instruction interaction between the inter-satellite adaptive communication system and the satellite housekeeping is realized; and C8051F040 has an SPI bus interface realized by hardware, and the adaptive control module can be conveniently connected with the ranging communication module by utilizing the SPI bus interface.
In addition, the invention also discloses a communication method implemented by using the inter-satellite adaptive communication system, which comprises the following steps:
1) the self-adaptive control module configures the ranging communication module into a ranging mode;
2) the ranging communication module carries out inter-satellite ranging;
3) the self-adaptive control module carries out inter-satellite link budget according to the inter-satellite distance measurement result of the distance measurement communication module;
4) the self-adaptive control module determines the communication code and the communication rate of the ranging communication module according to the inter-satellite link budget result;
5) the self-adaptive control module configures the ranging communication module according to the determined communication code and communication rate;
6) the ranging communication module is used for inter-planet communication.
The following is a detailed description of the procedure and principle of the communication method provided by the embodiment of the present invention.
1) The self-adaptive control module configures the ranging communication module into a ranging mode;
specifically, in the embodiment of the present invention, step 1) includes:
configuring an SX1280 chip unit into a ranging engine mode;
configuring an SX1280 chip unit into a master-slave mode;
the transmitting power of the SX1280 chip unit is configured to be the maximum value.
Taking an SX1280 radio frequency chip adopting a Lora modulation mode as an example, the maximum value of the emission power of an SX1280 chip unit is 12.5 dBm.
2) The ranging communication module carries out inter-satellite ranging;
specifically, when the ranging communication module carries out inter-satellite ranging, the antenna unit receives ranging signals from other satellites and sends the received ranging signals to the receiving channel unit through the microwave switch, the receiving channel unit receives the ranging signals from the microwave switch, the ranging signals are filtered and then sent to the SX1280 chip unit, the SX1280 chip unit analyzes the received ranging signals, and the distance between the satellite and the other satellites needing to be subjected to inter-satellite communication is determined so as to complete the inter-satellite ranging process.
3) The self-adaptive control module carries out inter-satellite link budget according to the inter-satellite distance measurement result of the distance measurement communication module;
specifically, after the ranging communication module finishes inter-satellite ranging, the adaptive control module reads an inter-satellite ranging result registered by an SX1280 chip unit in the ranging communication module, namely a specific distance value, and performs inter-satellite link budget according to the obtained distance value;
in the embodiment of the invention, the inter-satellite link budget result can be determined by using a formula 1;
wherein, PrRepresenting the result of the inter-satellite link budget, PtRepresents the output power, G, of an SX1280 chip unittDenotes the transmit gain of the transmit channel unit, AtDenotes the transmission gain of the antenna element, ArThe receiving gain of the antenna unit is represented, pi represents the circumference ratio, f represents the signal frequency of the radio frequency signal sent by the SX1280 chip unit, d represents the registered distance value of the SX1280 chip unit, and c represents the light speed.
Taking the parameters of each unit of the ranging communication module set as an example, the output power of the SX1280 chip unit is 12.5dBm, the transmission gain of the transmission channel unit is 20dB, the transmission gain and the receiving gain of the antenna unit are both 0dB, and the signal frequency of the radio frequency signal is 2.4 GHz.
By means of the arrangement, through inter-satellite link budget, the optimal communication code and communication rate of the ranging communication module adaptive to the current inter-satellite distance can be determined, so that the utilization rate of on-satellite energy is improved, and on-satellite energy is saved.
4) The self-adaptive control module determines the communication code and the communication rate of the ranging communication module according to the inter-satellite link budget result;
specifically, the adaptive control module obtains an inter-satellite link budget result P according to the aboverAnd determining the communication code and the communication rate of the ranging communication module by using the lookup table.
Taking an SX1280 radio frequency chip adopting a Lora modulation mode as an example, the relationship between the inter-satellite link budget result and the communication coding and communication rate is shown in table 1;
table 1 (relationship table of inter-satellite link budget result, communication rate and encoding parameter)
In table 1, coding parameters SF5 and SF8 both represent spreading factors, and the coding parameters correspond to communication codes and are the modulation method of the SX1280 radio frequency chip itself; the signal bandwidth corresponds to a communication rate, which can be uniquely determined by the signal bandwidth.
Specifically, based on table 1, the communication coding and communication rate of the ranging communication module are selected in the following manners: current inter-satellite link budget result PrGreater than-99 dBm, selecting signal bandwidth of 1625kHz and encoding parameter of SF 5; current inter-satellite link budget result PrIn the range of [ -99dBm, -105dBm), the bandwidth of the selected signal is 812kHz, and the encoding parameter is SF 5; current inter-satellite link budget result PrIn the range of [ -105dBm, -107dBm), the bandwidth of the selected signal is 406kHz, and the encoding parameter is SF 5; current inter-satellite link budget result PrIn the range of [ -107dBm, -109dBm), the bandwidth of the selected signal is 203kHz, and the encoding parameter is SF 5; current inter-satellite link budget result PrIn the range of [ -109dBm, -115dBm), the bandwidth of the selected signal is 1625kHz, and the coding parameter is SF 8; current inter-satellite link budget result PrIn the range of [ -115dBm, -116dBm), the signal bandwidth is selected to be 812kHz, and the coding parameter is SF 8; current inter-satellite link budget result PrIn the range of [ -116dBm, -118dBm), the bandwidth of the selected signal is 406kHz, and the encoding parameter is SF 8; current inter-satellite link budget result PrBelow-118 dBm, the select signal bandwidth is 203kHz and the encoding parameter is SF 8.
5) The self-adaptive control module configures the ranging communication module according to the determined communication code and communication rate;
specifically, the adaptive control module determines a specific communication code and a specific communication rate according to the signal bandwidth and the coding parameters obtained in the step 4, and configures an SX1280 chip unit in the ranging communication module based on the determined communication code and the determined communication rate, so that the ranging communication module starts inter-satellite communication.
6) The distance measurement communication module is used for carrying out inter-planet communication;
specifically, when the ranging communication module performs inter-satellite communication and the satellite needs to acquire information of other satellites, the antenna unit receives communication signals from other satellites and sends the received communication signals to the receiving channel unit through the microwave switch, the receiving channel unit filters the communication signals and sends the filtered communication signals to the SX1280 chip unit, and the SX1280 chip unit analyzes and processes the received communication signals to acquire information of other satellites; when this satellite needs to send self information to other satellites, SX1280 chip unit sends the communication signal who has specific information to the transmission channel unit, and transmission channel unit sends to the microwave switch after enlargiing and filtering communication signal, and the microwave switch sends received communication signal to antenna element, and antenna element sends communication signal to other satellites.
Therefore, the inter-satellite adaptive communication system and the inter-satellite adaptive communication method provided by the embodiment of the invention can realize the inter-satellite ranging and inter-satellite communication functions by utilizing the ranging communication module provided with the SX1280 chip unit, and the inter-satellite ranging and inter-satellite communication can be realized only by configuring parameters of the ranging communication module without carrying out separate development work, so that the inter-satellite adaptive communication system and the inter-satellite adaptive communication method are simple in structure, simple in design and development, small in size, low in energy consumption and high in sensitivity; meanwhile, adaptive configuration of communication coding and communication rate can be carried out according to an actual inter-satellite distance measurement result, the utilization rate of on-satellite energy is effectively improved, and on-satellite energy is saved.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. An inter-satellite adaptive communication method, wherein the communication method is implemented by using an inter-satellite adaptive communication system, the system being installed on a satellite-borne platform of a satellite, the system comprising: the system comprises a ranging communication module and an adaptive control module; the distance measurement communication module is used for receiving, transmitting and analyzing an inter-satellite distance measurement signal and an inter-satellite communication signal and comprises an SX1280 chip unit, a transmitting channel unit, a receiving channel unit, a microwave switch and an antenna unit; the SX1280 chip unit is respectively connected with the input end of the transmitting channel unit and the output end of the receiving channel unit, the output end of the transmitting channel unit is connected with the input end of the microwave switch, the input end of the receiving channel unit is connected with the output end of the microwave switch, and the transmitting end of the microwave switch is connected with the antenna unit; the self-adaptive control module is connected with the ranging communication module and is used for configuring and controlling the working mode, the communication code and the communication rate of the ranging communication module;
the communication method comprises the following steps:
1) the adaptive control module configures the ranging communication module to a ranging mode;
2) the ranging communication module is used for carrying out inter-satellite ranging;
3) the self-adaptive control module carries out inter-satellite link budget according to the inter-satellite distance measurement result of the distance measurement communication module;
4) the self-adaptive control module determines the communication code and the communication rate of the ranging communication module according to the inter-satellite link budget result;
5) the self-adaptive control module configures the ranging communication module according to the determined communication code and the communication rate;
6) the ranging communication module is used for inter-planet communication.
2. The inter-satellite adaptive communication method according to claim 1, wherein the step 1) comprises:
configuring the SX1280 chip unit into a ranging engine mode;
configuring the SX1280 chip unit into a master-slave mode;
and configuring the emission power of the SX1280 chip unit to be the maximum value.
3. The inter-satellite adaptive communication method according to claim 1, wherein the inter-satellite link budget result is determined using the following formula;
wherein, PrRepresenting the inter-satellite link budget result, PtRepresents the output power, G, of the SX1280 chip unittRepresents the transmission gain of the transmission channel unit, AtRepresents the transmission gain of the antenna element, ArThe receiving gain of the antenna unit is represented, pi represents a circumference ratio, f represents the signal frequency of a radio frequency signal sent by the SX1280 chip unit, d represents a registered distance value of the SX1280 chip unit, and c represents the speed of light.
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