CN113452433B - Low-orbit communication constellation inter-satellite transmission power control method - Google Patents
Low-orbit communication constellation inter-satellite transmission power control method Download PDFInfo
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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
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
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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 method for controlling inter-satellite transmission power of a low-orbit communication constellation, which comprises the following steps: setting default states of an information source satellite and an information sink satellite into a channel pre-evaluation mode; when the inter-satellite communication starts, the information source satellite enters a channel evaluation mode and sends a channel evaluation signal, the information sink satellite receives the channel evaluation signal and then transparently forwards the channel evaluation signal to the information source satellite, and then the information sink satellite switches to an inter-satellite communication receiving mode; the information source satellite receives the forwarded channel evaluation signal and carries out transmission channel evaluation, enters an inter-satellite communication transmission configuration mode, and configures inter-satellite transmission rate and minimum transmission power; and the information source satellite enters an inter-satellite communication sending mode, an inter-satellite communication signal is sent to the information sink satellite according to the configured inter-satellite transmission rate and the minimum sending power, and after the transmission of the inter-satellite communication signal is finished, the information source satellite and the information sink satellite return to a default channel pre-evaluation mode. The invention can complete the inter-satellite communication with the minimum transmission power and effectively reduce the power consumption of the satellite.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a method for controlling inter-satellite transmission power of a low-orbit communication constellation.
Background
With the blowout development of the commercial low-orbit satellite constellation, the giant satellite constellation brings cheaper, convenient, fast and stable broadband service for the public in the foreseeable future. Typical commercial space enterprises represented by space exploration company (SpaceX), one network company (OneWeb), and telecommunications satellite company (Telesat) successively publish respective medium and low orbit satellite constellation plans and rapidly advance the constellation deployment process. The global low-orbit satellite constellation has the characteristics of batch development, rapid deployment, high capacity, low time delay, global coverage and the like, so that the global low-orbit satellite constellation has an extremely wide application prospect.
For networking among satellites, a communication mode of an inter-satellite link must be adopted among the satellites, otherwise, a large number of ground stations must be built in a global range for relaying. The low-orbit communication satellite exchanges information among satellites through the inter-satellite communication link, can be separated from the constraint of a ground circular arc, increases the transmission distance, is beneficial to reducing information transmission delay caused by satellite communication, and increases the system capacity.
When the communication satellite works in orbit, power supply comes from solar energy, power supply burden can be effectively reduced by reducing power consumption, and therefore when inter-satellite communication is carried out, inter-satellite communication power needs to be reduced as far as possible, and transmission efficiency is improved. In order to improve the transmission efficiency of the inter-satellite link, chinese patent with publication number CN107508659A entitled "adaptive coding modulation method for data transmission of inter-satellite link of satellite navigation system" discloses an adaptive coding modulation method for data transmission of inter-satellite link of satellite navigation system, which adopts an adaptive coding modulation data transmission method based on continuous phase modulation according to the difference of inter-satellite distances of navigation satellite constellations to improve the reliability and effectiveness of the inter-satellite adaptive coding modulation system, but the method needs to use navigation messages of the navigation constellation to measure and calculate the distance between two satellites, and thus is only applicable to the navigation constellation. Chinese patent literature with publication number CN110708111B and name "adaptive communication system and communication method between stars" discloses an adaptive communication system between stars and a communication method thereof, by utilizing a ranging communication module equipped with an SX1280 chip unit, the functions of ranging between stars and communication between stars can be realized, and the implementation of ranging between stars and communication between stars only needs to carry out parameter configuration on the ranging communication module, does not need to carry out separate development work, and has simple design and development; and the adaptive configuration can be carried out according to the inter-satellite distance measurement result, and the utilization rate of on-satellite energy is improved. According to the method, the SX1280 chip is configured according to the working mode, the communication coding and the communication rate, and the SX1280 chip works in the L frequency band, has low frequency points and is difficult to be applied to high-speed inter-satellite communication.
Therefore, designing a method for controlling inter-satellite transmission power of a low-orbit communication constellation becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for controlling the inter-satellite transmission power of a low-orbit communication constellation.
Therefore, the invention discloses a method for controlling the inter-satellite transmission power of a low-orbit communication constellation, which comprises the following steps:
s1: inter-satellite channel assessment including (1) setting a source satellite and a sink satellite of a low earth orbit communication constellation to a channel pre-assessment mode by default before inter-satellite communication begins; (2) When the inter-satellite communication starts, the information source satellite enters a channel evaluation mode and sends a channel evaluation signal to the information sink satellite; (3) After receiving the channel evaluation signal, the information sink satellite transparently forwards the channel evaluation signal to the information source satellite and then switches to an inter-satellite communication receiving mode; (4) The information source satellite receives the channel evaluation signal forwarded by the information sink satellite and carries out transmission channel evaluation;
s2: inter-satellite communication transmission configuration, wherein the inter-satellite communication transmission configuration comprises an inter-satellite communication transmission configuration mode of an information source satellite after transmission channel evaluation is completed, and inter-satellite transmission rate and minimum transmission power are configured;
s3: after the inter-satellite communication transmission configuration is completed, the information source satellite enters an inter-satellite communication sending mode, and inter-satellite communication signals are transmitted to an information sink satellite in an inter-satellite communication receiving mode according to the configured inter-satellite transmission rate and the minimum sending power to carry out inter-satellite communication signal transmission; (2) And after the transmission of the inter-satellite communication signals is finished, the information source satellite and the information sink satellite return to the default channel pre-evaluation mode.
Further, in the method for controlling inter-satellite transmission power of a low earth orbit communication constellation, the inter-satellite channel estimation includes:
s11: detecting an inter-satellite communication starting instruction, detecting whether the inter-satellite communication starting instruction is received by an information source satellite, and if the inter-satellite communication starting instruction is received by the information source satellite, enabling the information source satellite to enter a channel evaluation mode; if the information source satellite does not receive the inter-satellite communication starting instruction, the following S12 is entered;
s12: detecting a channel evaluation signal, detecting whether the channel evaluation signal from the information source satellite is received by the information sink satellite in a matched filtering mode, if the channel evaluation signal from the information source satellite is not detected by the information sink satellite, returning to the S11, and continuously detecting whether an inter-satellite communication starting instruction is received by the information source satellite; if the sink satellite detects a channel estimation signal from the source satellite, the following step S13 is performed;
s13: and the information sink satellite directly and transparently forwards the channel evaluation signal without any processing, and the information sink satellite is converted into an inter-satellite communication receiving mode after the forwarding is finished.
Further, in the above method for controlling inter-satellite transmission power of a low earth orbit communication constellation, the inter-satellite communication start command is designed to be 32 bits, and the method includes: the 4-bit task identifier is used for judging whether the task is an inter-satellite transmission task; the information source satellite number of 8 bit; an 8-bit sink satellite number; 4bit inter-satellite transmission rate; an inter-satellite transmission quality of 4 bits, the inter-satellite transmission quality being represented by a transmission error rate required for inter-satellite communications; and the 4-bit check code is used for checking 28 bits in total of the task identifier, the information source satellite number, the information sink satellite number, the inter-satellite transmission rate and the inter-satellite transmission quality.
Further, in the above method for controlling inter-satellite transmission power of a low earth orbit communication constellation, the channel estimation signal is modulated by direct sequence spread spectrum, each satellite in the low earth orbit communication constellation is allocated with a different spreading code, and the spreading code of the direct sequence spread spectrum modulation used by the channel estimation signal sent from the source satellite to the sink satellite is the spreading code allocated to the sink satellite receiving the channel estimation signal from the source satellite.
Further, in the above method for controlling inter-satellite transmission power of a low-orbit communication constellation, a code pattern of the spreading code is a Gold code, and a short code with a code length of 1024 is used.
Further, in the above method for controlling inter-satellite transmission power of a low earth orbit communication constellation, after the source satellite receives the channel estimation signal forwarded by the sink satellite, the transmission channel estimation is performed as follows:
(4.1) calculating the transmission time delay t of the channel estimation signal d The specific calculation method comprises the following steps:
wherein, t 1 Time of channel estimation signal for the source satellite, t 2 Evaluating the time of the signal after the information source satellite receives the forwarded channel;
(4.2) calculation of the spatial free attenuation L p The specific calculation method comprises the following steps:
L p ＝20lg(4πft d )
wherein f is the frequency of the inter-satellite communication signal;
(4.3) evaluating the transmission channel to obtain the channel transmission gain A ch The specific calculation method comprises the following steps:
A ch ＝A tr +A re -L p
in the formula, A tr And A re The transmission gain of the source satellite and the reception gain of the sink satellite respectively.
Further, in the method for controlling inter-satellite transmission power of a low earth orbit communication constellation, the inter-satellite communication signal frequency is consistent with the operating frequency of a channel estimation signal sent by an information source satellite.
Further, in the method for controlling inter-satellite transmission power of a low-orbit communication constellation, the inter-satellite communication signal frequency is 30GHz.
Further, in the above method for controlling inter-satellite transmission power of low-orbit communication constellation, the inter-satellite transmission rate R configured in the inter-satellite communication transmission configuring step s Obtained by the assignment of the inter-satellite communication transmission task, the minimum transmitting power P configured in the inter-satellite communication transmission configuration step min Calculated according to the following formula:
wherein eta is the inter-satellite transmission quality, and is represented by the transmission error rate required by inter-satellite communication and is represented by the error rate; k is Boltzmann constant, T is receiver noise temperature, epsilon is inter-satellite communication transmission link margin, Q -1 (η) is the inverse of the Q (η) function, which is expressed as:
the method for controlling the inter-satellite transmission power of the low-orbit communication constellation has the beneficial effects that: the technical scheme provided by the invention adopts a mode of firstly evaluating the inter-satellite channel and then transmitting the inter-satellite communication, adopts the minimum transmission power to complete the inter-satellite communication according to the transmission characteristics of the inter-satellite channel and the requirement of the inter-satellite transmission rate, can effectively reduce the power consumption of the satellite under the condition of meeting the requirement of the inter-satellite communication, saves the energy on the satellite and improves the transmission efficiency.
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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. In the drawings:
fig. 1 is a flowchart of a method for controlling inter-satellite transmission power of a low-earth-orbit communication constellation according to an embodiment of the present invention;
fig. 2 is a flowchart of inter-satellite channel estimation in a method for controlling inter-satellite transmission power of a low-orbit communication constellation according to an embodiment of the present 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, the method for controlling inter-satellite transmission power of a low-orbit communication constellation provided in the embodiment of the present invention includes the following steps:
s1: inter-satellite channel estimation comprising (1) setting a source satellite and a sink satellite of a low earth orbit communication constellation to a channel pre-estimation mode by default before inter-satellite communication starts; (2) When the inter-satellite communication starts, the information source satellite enters a channel evaluation mode and sends a channel evaluation signal to the information sink satellite; (3) After receiving the channel evaluation signal, the information sink satellite transparently forwards the channel evaluation signal to the information source satellite and then switches to an inter-satellite communication receiving mode; (4) The information source satellite receives the channel evaluation signal forwarded by the information sink satellite, and transmission channel evaluation is carried out;
s2: inter-satellite communication transmission configuration, wherein the inter-satellite communication transmission configuration comprises an inter-satellite communication transmission configuration mode of an information source satellite after transmission channel evaluation is completed, and inter-satellite transmission rate and minimum transmission power are configured;
s3: after the inter-satellite communication transmission configuration is finished, the information source satellite enters an inter-satellite communication sending mode, and an inter-satellite communication signal is transmitted to an information sink satellite in an inter-satellite communication receiving mode according to the configured inter-satellite transmission rate and the minimum sending power to carry out inter-satellite communication signal transmission; (2) And after the transmission of the inter-satellite communication signals is finished, the information source satellite and the information sink satellite return to the default channel pre-evaluation mode.
As shown in fig. 2, the S1 inter-satellite channel estimation in the low earth orbit communication constellation inter-satellite transmission power control method of the present invention includes:
s11, detecting an inter-satellite communication starting command: the information source satellite detects whether an inter-satellite communication starting instruction is received, and if the information source satellite receives the inter-satellite communication starting instruction, the information source satellite enters a channel evaluation mode; and if the information source satellite does not receive the inter-satellite communication starting instruction, the S12 is carried out, and a channel evaluation signal is detected: the information sink satellite detects whether a channel evaluation signal from the information source satellite is received or not in a matched filtering mode, if the information sink satellite does not detect the channel evaluation signal from the information source satellite, the S11 is returned, and the information source satellite continues to detect whether an inter-satellite communication starting instruction is received or not; if the sink satellite detects the channel estimation signal from the source satellite, the method goes to S13, and transparently forwards the channel estimation signal: and the information sink satellite directly and transparently forwards the received channel evaluation signal to the information source satellite without any processing, and the information sink satellite is converted into an inter-satellite communication receiving mode after the forwarding is finished.
Further, as shown in table 1, an inter-satellite communication start instruction in the low earth orbit communication constellation inter-satellite transmission power control method implemented by the present invention may be designed to be 32 bits, and includes: a 4-bit task identifier used for judging whether the task is an inter-satellite transmission task; the number of an 8-bit information source satellite and the number of an 8-bit information sink satellite are used, so that 256 satellite numbers can be supported to the maximum extent; 4 bits of inter-satellite transmission rate, wherein the unit of the inter-satellite transmission rate is Mbps;4bit inter-satellite transmission quality, the inter-satellite transmission quality being represented by a transmission error rate required for inter-satellite communication; the check code of 4bit is used for checking a total of 28 bits of the task identifier, the information source satellite number, the information sink satellite number, the inter-satellite transmission rate and the inter-satellite transmission quality, and preferably, the check is performed by adopting a CRC (cyclic redundancy check) mode in the embodiment of the invention.
TABLE 1 INTER-START COMMUNICATION START INSTRUCTION COMPOSITION TABLE
| Task identifier | Source satellite numbering | Sink satellite number | Inter-satellite transmission rate | Quality of inter-satellite transmission | Check code |
| 4bit | 8bit | 8bit | 4bit | 4bit | 4bit |
Furthermore, the channel estimation signal in the inter-satellite transmission power control method of the low earth orbit communication constellation is modulated by direct sequence spread spectrum, and each satellite in the low earth orbit communication constellation is respectively allocated with a different spread spectrum code. The spreading code of the direct sequence spread spectrum modulation adopted by the channel estimation signal transmitted by the source satellite to the sink satellite is the spreading code allocated to the sink satellite receiving the channel estimation signal from the source satellite, so that only one sink satellite can detect and identify the channel estimation signal.
Preferably, in the method for controlling inter-satellite transmission power of a low earth orbit communication constellation, a code pattern of a spreading code of a channel estimation signal is a Gold code, and a short code with a code length of 1024 is adopted, so that an information sink satellite can conveniently identify the information sink satellite.
Further, in the method for controlling the inter-satellite transmission power of the low earth orbit communication constellation, after the information source satellite receives the channel estimation signal forwarded by the information sink satellite, the transmission channel estimation is performed as follows:
(4.1) calculating the transmission time delay t of the channel estimation signal d The specific calculation method comprises the following steps:
wherein, t 1 Time of channel estimation signal for the source satellite, t 2 And evaluating the time of the signal after the information source satellite receives the forwarded channel.
(4.2) calculating the spatial free attenuation L p The specific calculation method comprises the following steps:
L p ＝20lg(4πft d )
wherein f is the frequency of the inter-satellite communication signal.
Preferably, in the method for controlling inter-satellite transmission power of a low earth orbit communication constellation, the inter-satellite communication signal frequency is consistent with the operating frequency of a channel estimation signal sent by an information source satellite, and both the inter-satellite communication signal frequency and the operating frequency are selected to be 30GHz.
(4.3) evaluating the transmission channel to obtain the channel transmission gain A ch The specific calculation method comprises the following steps:
A ch ＝A tr +A re -L p
in the formula, A tr And A re The transmitting gain of the information source satellite and the receiving gain of the information sink satellite can be obtained through the design values of the satellites.
Furthermore, in the method for controlling the inter-satellite transmission power of the low-orbit communication constellation, the inter-satellite communication transmission configuration step is implementedConfigured inter-satellite transmission rate R s The minimum transmitting power P configured in the inter-satellite communication transmission configuration step is obtained through the designation of the inter-satellite communication transmission task min Calculated according to the following formula:
wherein eta is the transmission quality between the satellites, and is represented by the transmission error rate required by the communication between the satellites, and is represented by the error rate; k is Boltzmann constant, T is noise temperature of a receiver, the receiver is an inter-satellite communication terminal of a sink satellite, epsilon is inter-satellite communication transmission link margin, and Q is -1 (η) is the inverse of the Q (η) function, which is expressed as:
in the formula, t is an intermediate variable of the Q function.
In summary, the inter-satellite transmission power control method for the low earth orbit communication constellation provided by the embodiment of the present invention adopts a mode of first inter-satellite channel estimation and then inter-satellite communication transmission, and completes inter-satellite communication by using the minimum transmission power according to the inter-satellite channel transmission characteristics and the inter-satellite transmission rate requirement, so that the power consumption of a satellite can be effectively reduced, the energy on the satellite can be saved, and the transmission efficiency can be improved under the condition of meeting the inter-satellite communication requirement.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are 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 (7)
1. A method for controlling inter-satellite transmission power of a low earth orbit communication constellation is characterized by comprising the following steps:
s1: inter-satellite channel assessment including (1) setting a source satellite and a sink satellite of a low earth orbit communication constellation to a channel pre-assessment mode by default before inter-satellite communication begins; (2) When inter-satellite communication starts, the information source satellite enters a channel evaluation mode and sends a channel evaluation signal to the information sink satellite; (3) After receiving the channel evaluation signal, the information sink satellite transparently forwards the channel evaluation signal to the information source satellite and then switches to an inter-satellite communication receiving mode; (4) The information source satellite receives the channel evaluation signal forwarded by the information sink satellite and carries out transmission channel evaluation;
s2: inter-satellite communication transmission configuration, wherein the inter-satellite communication transmission configuration comprises an inter-satellite communication transmission configuration mode of an information source satellite after transmission channel evaluation is completed, and inter-satellite transmission rate and minimum transmission power are configured;
s3: after the inter-satellite communication transmission configuration is completed, the information source satellite enters an inter-satellite communication sending mode, and transmits inter-satellite communication signals to an information sink satellite in an inter-satellite communication receiving mode according to the configured inter-satellite transmission rate and the minimum sending power to carry out inter-satellite communication signal transmission; (2) After the inter-satellite communication signal transmission is finished, the information source satellite and the information sink satellite return to a default channel pre-evaluation mode;
after the information source satellite receives the channel estimation signal forwarded by the information sink satellite, the transmission channel estimation is carried out according to the following mode:
(4.1) calculating the transmission time delay t of the channel estimation signal d The specific calculation method comprises the following steps:
wherein, t 1 Time of channel estimation signal for the source satellite, t 2 Evaluating the time of the signal after the information source satellite receives the forwarded channel;
(4.2) calculation of the spatial free attenuation L p The specific calculation method comprises the following steps:
L p ＝20lg(4πft d )
wherein f is the frequency of the inter-satellite communication signal;
(4.3) evaluating the transmission channel to obtain the channel transmission gain A ch The specific calculation method comprises the following steps:
A ch ＝A tr +A re -L p
in the formula, A tr And A re The transmitting gain of the information source satellite and the receiving gain of the information sink satellite are respectively obtained;
the inter-satellite transmission rate R configured in the inter-satellite communication transmission configuration step s The minimum transmitting power P configured in the inter-satellite communication transmission configuration step is obtained through the designation of the inter-satellite communication transmission task min Calculated according to the following formula:
wherein eta is the transmission quality between the satellites and is represented by the transmission error rate required by the communication between the satellites; k is Boltzmann constant, T is the noise temperature of the receiver, epsilon is the margin of the inter-satellite communication transmission link,Q -1 (η) is the inverse of the Q (η) function, which is expressed as:
2. the method of claim 1, wherein the inter-satellite channel estimation comprises:
s11: detecting an inter-satellite communication starting instruction, detecting whether the inter-satellite communication starting instruction is received by an information source satellite, and if the inter-satellite communication starting instruction is received by the information source satellite, entering a channel evaluation mode by the information source satellite; if the information source satellite does not receive the inter-satellite communication starting instruction, the following S12 is entered;
s12: detecting a channel evaluation signal, detecting whether the channel evaluation signal from the information source satellite is received by the information sink satellite in a matched filtering mode, if the channel evaluation signal from the information source satellite is not detected by the information sink satellite, returning to the S11, and continuously detecting whether an inter-satellite communication starting instruction is received by the information source satellite; if the sink satellite detects a channel estimation signal from the source satellite, the following step S13 is performed;
s13: and the information sink satellite directly and transparently forwards the channel evaluation signal without any processing, and the information sink satellite is converted into an inter-satellite communication receiving mode after the forwarding is finished.
3. The method according to claim 2, wherein the inter-satellite communication start command is designed to be 32 bits, and comprises: the 4-bit task identifier is used for judging whether the task is an inter-satellite transmission task; the information source satellite number of 8 bit; an 8-bit sink satellite number; 4bit inter-satellite transmission rate; an inter-satellite transmission quality of 4 bits, said inter-satellite transmission quality being represented by a transmission error rate required for inter-satellite communications; and the 4-bit check code is used for checking 28 bits in total of the task identifier, the information source satellite number, the information sink satellite number, the inter-satellite transmission rate and the inter-satellite transmission quality.
4. The method according to claim 2, wherein the channel estimation signal is modulated by direct sequence spread spectrum, each satellite in the low earth orbit communication constellation is assigned a different spreading code, and the spreading code of the direct sequence spread spectrum modulation used for the channel estimation signal transmitted from the source satellite to the sink satellite is the spreading code assigned to the sink satellite receiving the channel estimation signal from the source satellite.
5. The method of claim 4, wherein the spreading code has a code pattern of Gold code and a code length of 1024 short codes.
6. The method of claim 1, wherein the inter-satellite communication signal frequency is consistent with an operating frequency of a channel estimation signal transmitted by a source satellite.
7. The method of claim 6, wherein the inter-satellite communication signal frequency is 30GHz.
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