Satellite TT&C data adaptive communication method and system

Abstract

This invention provides an adaptive communication method for satellite telemetry and control data, applied to satellite-to-ground communication including a satellite-based computer and a ground station control system. The method includes: a satellite receiving a remote control transmission signal from a ground station, performing power monitoring to obtain first link attenuation information, and outputting this information to the satellite-based computer; the satellite performing a first demodulation of the telemetry transmission signal to obtain first modulation information, and then performing a second demodulation based on the first modulation information to obtain remote control commands; the satellite-based computer sequentially performing a first modulation and a second modulation on the satellite's telemetry information based on the first link attenuation information to generate a telemetry transmission signal and sending it to the ground station. This method achieves dynamic matching between communication rate and link status.

Description

Technical Field

[0001] This invention relates to the field of satellite communication technology, and more specifically, to an adaptive communication method and system for satellite telemetry and control data. Background Technology

[0002] In satellite telemetry, tracking, and command (TT&C) systems, uplink transmission of remote control commands and downlink transmission of telemetry data are required between the onboard TT&C unit and the ground-based TT&C baseband. Traditional satellite TT&C communication typically uses a fixed communication rate, meaning that the same modulation scheme and communication rate are used throughout the satellite's entire transit.

[0003] However, during a satellite's transit, the transmission attenuation of the satellite-to-ground link dynamically changes with the satellite's elevation angle. Specifically, when the satellite is just rising or about to set, the elevation angle is low, the signal travels a longer atmospheric path, and the link attenuation is greater; when the satellite is at the apex of its transit, the elevation angle is high, and the link attenuation is less. When the link attenuation is significant, using high-speed communication can lead to a sharp increase in the bit error rate, or even prevent the establishment of effective communication; conversely, when the link attenuation is small, using low-speed communication will not fully utilize the channel capacity, resulting in low communication efficiency.

[0004] Current technologies employ fixed-rate communication, which cannot adapt to dynamic changes in the communication link. How to achieve dynamic adaptive adjustment of the communication rate while maintaining the existing communication system is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an adaptive communication method and system for satellite telemetry and control data.

[0006] This invention provides an adaptive communication method for satellite telemetry, tracking, and command (TT&C) data, applied to satellite-to-ground communication including a satellite computer and a ground station control system, comprising: Satellite end: The satellite receives remote transmission signals from the ground station, performs power monitoring to obtain first link attenuation information, and outputs it to the satellite computer. The satellite performs a first demodulation of the telemetry transmission signal to obtain the first modulation information, and then performs a second demodulation based on the first modulation information to obtain the remote control command. The satellite computer modulates the satellite's telemetry information in the first and second stages according to the first link attenuation information, generates a telemetry transmission signal, and sends it to the ground station. Ground station end: The ground station receives the telemetry transmission signal transmitted by the satellite, performs power monitoring to obtain the second link attenuation information, and outputs it to the ground station control system; The ground station performs a first demodulation of the telemetry transmitted signal to obtain the second modulation information, and then performs a second demodulation based on the second modulation information to obtain telemetry data. The ground station control system modulates the remote control information of the ground station in the first and second stages according to the second link attenuation information, generates a remote control transmission signal, and sends it to the satellite.

[0007] According to one embodiment of the present invention, the first demodulation and the second modulation adopt a conventional fixed modulation method to carry modulation information; the first modulation adopts a variable modulation method that is dynamically adjusted according to link attenuation information to carry actual remote control information or telemetry information.

[0008] According to one embodiment of the present invention, the variable modulation method includes: when the link attenuation is greater than a preset threshold, a low-order modulation method is adopted; when the link attenuation is less than the preset threshold, a high-order modulation method is adopted.

[0009] According to one embodiment of the present invention, the low-order modulation scheme includes at least BPSK or QPSK, and the high-order modulation scheme includes at least 8PSK or 16APSK.

[0010] According to one embodiment of the present invention, both the satellite and the ground station communicate in a spread spectrum communication system, and the spread spectrum signal is amplitude modulated.

[0011] On the other hand, the present invention also provides a satellite telemetry and control data adaptive communication system, comprising: Satellites, including: The spaceborne telemetry and control unit is used to receive remote control transmission signals and demodulate them sequentially to obtain remote control commands, and to generate telemetry transmission signals by performing first and second modulation on the satellite's telemetry information sequentially to transmit them; it includes a power monitoring module for monitoring the power of the received remote control transmission signals and outputting first link attenuation information. The satellite computer is used to dynamically select the first modulation method of telemetry information based on the first link attenuation information. Ground stations, including: The ground station telemetry and control baseband is used to receive telemetry transmission signals and perform first and second demodulation on them to obtain telemetry data, as well as to perform first and second modulation on the remote control information of the ground station to generate remote control transmission signals for transmission; it includes a power monitoring module to monitor the power of the received telemetry transmission signals and output second link attenuation information. The ground station control system is used to dynamically select the first modulation method of the remote control information based on the second link attenuation information.

[0012] According to one embodiment of the present invention, the first demodulation and the second modulation adopt a conventional fixed modulation method to carry modulation information; the first modulation adopts a variable modulation method that is dynamically adjusted according to link attenuation information to carry actual remote control information or telemetry information.

[0013] According to one embodiment of the present invention, the variable modulation method includes: when the link attenuation is greater than a preset threshold, a low-order modulation method is adopted; when the link attenuation is less than the preset threshold, a high-order modulation method is adopted.

[0014] According to one embodiment of the present invention, the low-order modulation scheme includes at least BPSK or QPSK, and the high-order modulation scheme includes at least 8PSK or 16APSK.

[0015] According to one embodiment of the present invention, both the satellite and the ground station communicate in a spread spectrum communication system, and the spread spectrum signal is amplitude modulated.

[0016] The adaptive communication method for satellite telemetry and control data in this embodiment monitors the power of the received signal, obtains its link attenuation information in real time, and dynamically adjusts the modulation mode according to the link attenuation. When the link quality is good, high-order modulation is used to improve the communication rate, and low-order modulation is used to ensure communication reliability when the link quality is poor, thus realizing dynamic matching between communication rate and link status.

[0017] It should be understood that the above general description and the following specific embodiments are merely exemplary and illustrative, and do not limit the scope of the invention. Attached Figure Description

[0018] The accompanying drawings, which are part of the specification of this invention, illustrate exemplary embodiments of the invention. The drawings, together with the description in the specification, serve to illustrate the principles of the invention.

[0019] Figure 1 This is a schematic diagram of an adaptive communication method for satellite telemetry and control data according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a satellite telemetry and control data adaptive communication system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a satellite telemetry and control data adaptive communication method according to another embodiment of the present invention. Detailed Implementation

[0020] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and to exemplify the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of the present invention.

[0021] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0022] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0023] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., and should not be considered limiting. Similar terms are used throughout the description to refer to similar elements.

[0024] It will be apparent to those skilled in the art that the present invention can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

[0025] Figure 1 This is a schematic diagram of an adaptive communication method for satellite telemetry and control data according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a satellite telemetry and control data adaptive communication system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a satellite telemetry and control data adaptive communication method according to another embodiment of the present invention.

[0026] Example 1: Adaptive Communication Method for Satellite Telemetry and Control Data like Figure 1 and Figure 3 As shown, this embodiment provides a satellite telemetry and control data adaptive communication method, which is applied to satellite-to-ground communication including a satellite computer and a ground station control system.

[0027] During the initial stage of establishing the satellite-to-ground link, since the link status is unknown, the ground station defaults to using the lowest-order modulation scheme for initial remote control information transmission. For example, in this embodiment, the lowest-order modulation scheme uses binary phase-shift keying (BPSK) modulation, corresponding to the lowest communication rate. Simultaneously, the agreed-upon fixed modulation scheme uses amplitude modulation (ASK) to carry modulation scheme identification information.

[0028] After the satellite receives the remote control signal, the power monitoring module of the onboard telemetry and control system monitors the power of the received signal, obtains the first link attenuation information, and outputs it to the onboard computer. Simultaneously, the baseband module of the onboard telemetry and control system performs a first demodulation of the received signal according to an agreed-upon modulation scheme, such as ASK, to obtain the modulation scheme identifier used in this frame of data (e.g., BPSK). Subsequently, based on this modulation scheme identifier, the onboard telemetry and control system performs a second demodulation of the received signal using the corresponding BPSK demodulation scheme to obtain the remote control command and send it to the onboard computer.

[0029] After receiving the first link attenuation information, the onboard computer determines the current link quality based on this information and selects a suitable initial modulation scheme. For example, when the link attenuation is less than a preset threshold, a higher-order modulation scheme such as 8PSK or 16APSK can be selected; when the link attenuation is greater than the preset threshold, a lower-order modulation scheme such as BPSK or QPSK is selected. The onboard computer then transmits the telemetry information and the selected modulation scheme to the onboard telemetry and control unit.

[0030] The onboard telemetry and control system modulates the telemetry information for the first time according to the selected modulation method, and then modulates the information containing the modulation method identifier a second time using the agreed ASK modulation to generate a telemetry transmission signal, which is then transmitted to the ground station through the antenna.

[0031] After receiving the telemetry transmission signal, the power monitoring module of the ground station's telemetry and control baseband monitors the power of the received signal, obtains the second link attenuation information, and outputs it to the ground station control system. Simultaneously, the ground station's telemetry and control baseband performs a first demodulation of the received signal according to an agreed-upon modulation scheme, such as ASK, to obtain the modulation scheme identifier used in this frame of data. Then, based on this identifier, it selects the corresponding demodulation scheme to perform a second demodulation of the received signal, obtaining the telemetry data.

[0032] After receiving the second link attenuation information, the ground station control system dynamically and adaptively adjusts the modulation scheme of subsequent remote control commands based on this information, selecting a suitable first modulation scheme according to the second link attenuation information. For example, when the link attenuation is less than a preset threshold, a higher-order modulation scheme such as 8PSK or 16APSK can be selected; when the link attenuation is greater than the preset threshold, a lower-order modulation scheme such as BPSK or QPSK is selected. The ground station control system then transmits the remote control information and the selected modulation scheme to the ground station telemetry and control baseband.

[0033] The ground station telemetry and control baseband first selects a variable modulation mode based on the current link status, modulates the remote control information for the first time according to the selected modulation mode, and then modulates the information containing the modulation mode identifier a second time using the agreed ASK modulation to generate a remote control transmission signal, which is then sent to the satellite through the antenna.

[0034] The adaptive communication method for satellite telemetry and control data in this invention can solve the problem of using a fixed communication rate during satellite communication. Within the limited time period of satellite transit, the communication rate is continuously adjusted according to the changes in the distance between the satellite and the ground station and different weather conditions during communication. This enables efficient telemetry and control communication between the satellite and the ground station during satellite transit, thereby solving the problem of telemetry and control capacity saturation during subsequent large-scale constellation construction.

[0035] In one embodiment, during communication, the satellite and ground station respectively control the switching of modulation methods in real time based on the received link attenuation information. Specifically: When link attenuation exceeds a preset threshold, a low-order modulation scheme is employed to ensure communication reliability. This low-order modulation scheme includes at least Binary Phase Shift Keying (BPSK) or Quadrature Phase Shift Keying (QPSK).

[0036] When the link attenuation is less than a preset threshold, a higher-order modulation scheme is used to improve the communication rate. The higher-order modulation scheme includes at least octal phase shift keying modulation (8PSK) or hexadecimal amplitude phase shift keying modulation (16APSK).

[0037] When link attenuation falls between two thresholds, the current modulation scheme is maintained to avoid frequent switching. In this embodiment, the communication rate of QPSK modulation is twice that of BPSK modulation, the communication rate of 8PSK modulation is three times that of BPSK modulation, and the communication rate of 16APSK modulation is even higher.

[0038] In this embodiment, both the satellite and the ground station communicate using a spread spectrum communication system. While maintaining the original spread spectrum communication system, the spread spectrum signal is amplitude modulated. The amplitude modulation information indicates the spread spectrum modulation method used in this frame of data to the receiving end, enabling the receiving end to select the corresponding demodulation method for information parsing based on the amplitude modulation information.

[0039] While maintaining the original spread spectrum communication system, by adding an amplitude modulation layer to carry modulation mode information, it is highly compatible with the existing measurement and control communication system, making it easy to upgrade and transform the existing system.

[0040] After receiving the remote control transmission signal, the satellite first buffers the signal, then performs the first and second demodulation operations sequentially to achieve real-time parsing of the remote control command, avoiding parsing delays caused by unknown modulation methods. Similarly, after receiving the telemetry transmission signal, the ground station also first buffers the signal, then performs the first and second demodulation operations sequentially to achieve real-time parsing of the telemetry data.

[0041] Furthermore, according to one embodiment of the present invention, link attenuation information is acquired in real time through power monitoring, and the modulation scheme is dynamically adjusted according to the link attenuation. Higher-order modulation is used to improve communication rate when link quality is good, and lower-order modulation is used to ensure communication reliability when link quality is poor, thus achieving dynamic matching between communication rate and link status. In this embodiment, a predetermined fixed modulation scheme is used to carry modulation scheme identification information, while a variable modulation scheme is used to carry the actual data. The receiving end obtains the modulation scheme through the first demodulation and then performs a second demodulation to recover the data. This mechanism can achieve real-time notification and switching of the modulation scheme without additional signaling interaction.

[0042] Example 2: Adaptive Communication System for Satellite Telemetry and Control Data like Figure 2 As shown, this embodiment provides a satellite telemetry and control data adaptive communication system for implementing the method described in Embodiment 1.

[0043] The system consists of two parts: a ground station and a satellite.

[0044] 1. Ground station The ground station includes the ground station telemetry and control baseband and the ground station control system.

[0045] Ground station telemetry and control baseband includes: Downlink demodulation module: This module performs a first demodulation (ASK demodulation) and a second demodulation on the telemetry transmission signals received from the satellite. The first demodulation obtains the modulation scheme identifier (e.g., BPSK) used in the current frame. Based on this identifier, the telemetry and control baseband uses the corresponding BPSK demodulation method to perform a second demodulation on the received signal to obtain the telemetry data.

[0046] Uplink modulation module: used to sequentially modulate the remote control information from the ground station into a first modulation (variable modulation mode modulation) and a second modulation (ASK modulation) to generate a remote control transmission signal.

[0047] Power monitoring module: Used to monitor the power of the received telemetry transmission signal and output the second link attenuation information to the ground station control system.

[0048] The ground station control system is used to receive telemetry data and first link attenuation information, and dynamically select the first modulation mode (i.e., variable modulation mode) of the remote control information based on the second link attenuation information.

[0049] 2. Satellite The satellite includes an onboard telemetry and control system and a satellite-based computer.

[0050] The spaceborne telemetry and control system includes: Downlink demodulation module: Used to perform a first demodulation (e.g., ASK demodulation) and a second demodulation on the remote control transmission signal received from the ground station. The first demodulation obtains the modulation scheme identifier (e.g., BPSK) of the current frame data. Based on this modulation scheme identifier, the onboard telemetry and control unit uses the corresponding BPSK demodulation method to perform a second demodulation on the received signal to obtain the remote control command.

[0051] Uplink modulation module: used to sequentially modulate the satellite's telemetry information into a first modulation (variable modulation mode) and a second modulation (such as ASK modulation) to generate a telemetry transmission signal.

[0052] Power monitoring module: Used to monitor the power of the received remote control transmission signal and output the first link attenuation information to the satellite computer.

[0053] The satellite computer is used to receive remote control commands and second link attenuation information, and dynamically select the first modulation mode (i.e., variable modulation mode) of the telemetry information based on the first link attenuation information.

[0054] 3. System Workflow During system initialization, the ground station and satellite use BPSK modulation as the variable modulation method by default.

[0055] In the uplink, the ground station control system generates a modulation scheme control word based on the current link status (initially BPSK). The ground station telemetry and control baseband modulates the remote control command for the first time according to this control word, and then uses ASK for the second modulation to encapsulate the modulation scheme identifier before transmission. After the satellite receives the signal, it obtains the second link attenuation information through power monitoring and feeds it back to the satellite computer. At the same time, it obtains the modulation scheme identifier through the first demodulation using ASK, and then uses the corresponding method for the second demodulation to obtain the remote control command.

[0056] In the downlink, the onboard computer selects a modulation scheme based on the received second link attenuation information. The onboard telemetry and data transfer (TT&C) system modulates the telemetry information using this modulation scheme for the first time, and then uses ASK (Automatic Sounding) for a second modulation to encapsulate the modulation scheme identifier before transmitting. After receiving the data, the ground station obtains the first link attenuation information through power monitoring and feeds it back to the ground station control system. Simultaneously, it obtains the modulation scheme identifier through ASK demodulation for the first time, and then uses the corresponding method for a second demodulation to obtain the telemetry data.

[0057] Next, the ground station control system selects a modulation scheme based on the received first link attenuation information. The ground station telemetry and control baseband modulates the remote control command for the first time according to this modulation scheme, and then transmits it after encapsulating the modulation scheme identifier using ASK second modulation. The uplink steps continue to cycle through the same process.

[0058] During satellite transit, as the link attenuation changes, the ground station control system and the satellite computer dynamically adjust the modulation mode to achieve adaptive switching of communication rate.

[0059] Example 3: Switching Strategy for Variable Modulation Mode This embodiment provides a detailed description of the switching strategy for variable modulation methods.

[0060] Three link state ranges are defined: When the received signal power is below the first threshold (corresponding to a large link attenuation), BPSK modulation is used, resulting in the lowest communication rate. When the received signal power is between the first threshold and the second threshold, QPSK modulation is used, and the communication rate is twice that of BPSK. When the received signal power is higher than the second threshold, 8PSK modulation is used, and the communication rate is 3 times that of BPSK.

[0061] To avoid frequent switching of modulation schemes, a hysteresis comparison mechanism is employed: the up-order threshold is higher than the down-order threshold. For example, when the signal power rises above -90dBm, it switches from BPSK to QPSK; when the signal power drops below -95dBm, it switches back from QPSK to BPSK. This hysteresis range effectively avoids the ping-pong effect caused by power fluctuations.

[0062] Example 4: Implementation under Spread Spectrum Communication System This embodiment illustrates the specific implementation method under the spread spectrum communication system.

[0063] This scheme, while maintaining the original spread spectrum communication system, performs amplitude modulation (ASK) on the spread spectrum signal. Specifically: Transmitter: The baseband data is spread spectrum processed to obtain the spread spectrum signal; then, the spread spectrum modulation method (BPSK / QPSK / 8PSK, etc.) is selected according to the current link status, and the spread spectrum signal is modulated for the first time according to the selected modulation method; finally, ASK modulation is used to modulate the information containing the modulation method identifier for the second time to form the final transmitted signal.

[0064] Receiver: First, the received signal is demodulated using ASK to obtain the spread spectrum modulation scheme identifier used in this frame of data; then, based on the identifier, the signal is despread and the original baseband data is recovered using the corresponding second demodulation scheme.

[0065] This implementation fully utilizes the anti-interference characteristics and multiple access capabilities of existing spread spectrum communication systems, while adding an amplitude modulation layer to achieve dynamic indication of the modulation mode, making it highly compatible with existing systems.

[0066] The adaptive communication method and system for satellite telemetry, tracking, and command (TT&C) data provided by this invention can switch the communication rate in real time according to link attenuation during satellite transit, maximizing communication efficiency while ensuring communication reliability. This solution does not require changes to the existing spread spectrum communication system, is simple to implement, highly compatible, and can be widely applied to various satellite TT&C communication systems, demonstrating significant industrial practical value.

[0067] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A satellite telemetry and control data adaptive communication method, characterized in that, Applications include space-to-ground communications encompassing spaceborne computers and ground station control systems, including: Satellite end: The satellite receives remote transmission signals from the ground station, performs power monitoring to obtain first link attenuation information, and outputs it to the satellite computer. The satellite performs a first demodulation of the telemetry transmission signal to obtain the first modulation information, and then performs a second demodulation based on the first modulation information to obtain the remote control command. The satellite computer modulates the satellite's telemetry information in the first and second stages according to the first link attenuation information, generates a telemetry transmission signal, and sends it to the ground station. Ground station end: The ground station receives the telemetry transmission signal transmitted by the satellite, performs power monitoring to obtain the second link attenuation information, and outputs it to the ground station control system; The ground station performs a first demodulation of the telemetry transmitted signal to obtain the second modulation information, and then performs a second demodulation based on the second modulation information to obtain telemetry data. The ground station control system modulates the remote control information of the ground station in the first and second stages according to the second link attenuation information, generates a remote control transmission signal, and sends it to the satellite.

2. The satellite telemetry and control data adaptive communication method according to claim 1, characterized in that: The first demodulation and the second modulation adopt a fixed modulation scheme to carry modulation information; The first modulation employs a variable modulation method that is dynamically adjusted based on link attenuation information, and is used to carry actual remote control or telemetry information.

3. The satellite telemetry and control data adaptive communication method according to claim 2, characterized in that, The variable modulation method includes: When the link attenuation exceeds a preset threshold, a low-order modulation method is used; When the link attenuation is less than a preset threshold, a higher-order modulation method is used.

4. The satellite telemetry and control data adaptive communication method according to claim 3, characterized in that, in, The low-order modulation scheme includes at least BPSK or QPSK, and the high-order modulation scheme includes at least 8PSK or 16APSK.

5. The satellite telemetry and control data adaptive communication method according to claim 1, characterized in that, Both the satellite and the ground station communicate using a spread spectrum communication system, which modulates the spread spectrum signal.

6. A satellite telemetry, tracking, and command (TT&C) data adaptive communication system, characterized in that, include: Satellites, including: The spaceborne telemetry and control unit is used to receive remote control transmission signals and demodulate them sequentially to obtain remote control commands, and to generate telemetry transmission signals by performing first and second modulation on the satellite's telemetry information sequentially to transmit them; it includes a power monitoring module for monitoring the power of the received remote control transmission signals and outputting first link attenuation information. The satellite computer is used to dynamically select the first modulation method of telemetry information based on the first link attenuation information. Ground stations, including: The ground station telemetry and control baseband is used to receive telemetry transmission signals and perform first and second demodulation on them to obtain telemetry data, as well as to perform first and second modulation on the remote control information of the ground station to generate remote control transmission signals for transmission; it includes a power monitoring module to monitor the power of the received telemetry transmission signals and output second link attenuation information. The ground station control system is used to dynamically select the first modulation method of the remote control information based on the second link attenuation information.

7. The satellite telemetry, tracking, and command data adaptive communication system according to claim 6, characterized in that: The first demodulation and the second modulation adopt a fixed modulation scheme to carry modulation information; The first modulation employs a variable modulation method that is dynamically adjusted based on link attenuation information, and is used to carry actual remote control or telemetry information.

8. The satellite telemetry, tracking, and command data adaptive communication system according to claim 7, characterized in that, The variable modulation method includes: When the link attenuation exceeds a preset threshold, a low-order modulation method is used; When the link attenuation is less than a preset threshold, a higher-order modulation method is used.

9. The satellite telemetry, tracking, and command data adaptive communication system according to claim 8, characterized in that, The low-order modulation scheme includes at least BPSK or QPSK, and the high-order modulation scheme includes at least 8PSK or 16APSK.

10. The satellite telemetry, tracking, and command data adaptive communication system according to claim 6, characterized in that, Both the satellite and the ground station communicate using a spread spectrum communication system, which modulates the spread spectrum signal.

Images