A satellite signal and resource regulation method and system integrating transmission and guidance

Abstract

The application relates to a satellite signal and resource regulation method and system. The method generates a two-way positioning timing service inbound signal composed of a satellite common synchronization header and a data segment through modulation, so that all satellites or ground receiving links corresponding to the satellites can receive signals according to the satellite common synchronization header, the requirement of two-way positioning timing for multiple satellite beams is met, and the success rate and accuracy of two-way positioning timing are ensured; a communication service inbound signal composed of a home satellite synchronization header and a data segment is used, so that signal reception can be performed only through the home satellite or the ground receiving link corresponding to the home satellite, occupation of other satellite signal processing channel resources is avoided, and communication capacity is improved. The application can realize compatibility of communication services and two-way positioning timing services without increasing on-board or ground station processing resources, and the satellite communication capacity is improved and the accuracy of two-way positioning timing is improved.

Description

Technical Field

[0001] This application relates to the field of satellite navigation and communication technology, and in particular to a method and system for the integrated control of satellite signals and resources that combines communication and navigation. Background Technology

[0002] Satellite communication and two-way positioning timing capabilities are closely related to the satellite uplink receiving beamwidth, but the two indicators are mutually restrictive. Specifically, to achieve satellite two-way positioning timing, the satellite uplink receiving beamwidth needs to be sufficiently large, and the number of beam overlap layers needs to reach three or more to ensure that the same user's signal can be received by three or more satellites, thereby guaranteeing the success rate and accuracy of two-way positioning timing. However, when the satellite uplink receiving beamwidth is larger and the number of beam overlap layers is greater, the same user's incoming signal will be received and processed by multiple satellites, consuming unnecessary on-board or ground station signal processing channel resources and reducing the overall system's uplink communication capacity.

[0003] Therefore, how to simultaneously balance satellite communication capacity and the accuracy of two-way positioning and timing services has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] Therefore, it is necessary to provide a method and system for the integrated control of satellite signals and resources that addresses the aforementioned technical problems.

[0005] A method for controlling satellite signals and resources integrating communication and navigation, the method comprising:

[0006] Based on the service requirements of user equipment and the signal quality and channel processing resource utilization of the downlink outgoing signals broadcast by each satellite, uplink incoming signals of different service types are modulated and generated and transmitted; among them, the uplink incoming signals include bidirectional positioning and timing service incoming signals composed of satellite shared synchronization headers and data segments, and communication service incoming signals composed of home satellite synchronization headers and data segments.

[0007] For the incoming signals of the two-way positioning and timing service, each satellite receives the signal based on the satellite's shared synchronization head, and performs two-way positioning and timing service processing on the satellite payload or by forwarding the signal to the ground center station.

[0008] For incoming communication signals, the signal is received by the home satellite corresponding to the home satellite synchronization header, and the communication service is processed on-board or forwarded to the ground center station according to the satellite payload of the home satellite.

[0009] In one embodiment, based on the user equipment's service requirements and the signal quality and channel processing resource utilization of the downlink outgoing signals broadcast by each satellite, uplink incoming signals of different service types are modulated and transmitted, including:

[0010] When the user equipment has a bidirectional positioning and timing service requirement, it receives downlink outgoing signals broadcast by three or more satellites, and after selecting any one of the satellites as the synchronous satellite, it modulates and generates a bidirectional positioning and timing service incoming signal composed of a shared synchronization header and data segment of the satellites. At the reference time of a certain frame of the downlink outgoing signal broadcast by the synchronous satellite, it sends the bidirectional positioning and timing service incoming signal.

[0011] When a user equipment has communication service requirements, it receives and measures downlink outgoing signals broadcast by one or more satellites. Based on the satellite number carried in the downlink outgoing signal, the channel processing resource utilization rate, and the signal quality measurement value, it selects the home satellite and modulates and generates a communication service incoming signal consisting of a home satellite synchronization header and a data segment for transmission. The spreading code sequence of the home satellite synchronization header is generated by using the corresponding number of the home satellite as the initial phase of the spreading code generator polynomial. The signal quality measurement values ​​include the carrier-to-noise ratio and Doppler shift of the downlink outgoing signal.

[0012] In one embodiment, satellite attribution is selected based on the satellite number carried in the downlink outgoing signal, channel processing resource utilization, and signal quality measurements, including:

[0013] Based on the satellite number carried in the downlink outgoing signal, the channel processing resource utilization rate, and the signal quality measurement value, the selection probability of each satellite is calculated, and the satellite with the highest probability value is selected as the assigned satellite; the expression for calculating the selection probability is as follows:

[0014] ;

[0015] in, Indicates satellite Selection probability, subscript Indicates the satellite number; and These are non-negative weighting coefficients; Indicates satellite Channel processing resource utilization rate Indicates satellite The number of demodulation channels currently in use. Indicates satellite The total number of normal demodulation channels; and These represent satellite measurements taken by the user equipment. The carrier-to-noise ratio and Doppler shift of the broadcast downlink outgoing signal;

[0016] Alternatively, when a user equipment continuously transmits multiple frames of inbound communication service signals and expects the home satellite to remain unchanged during signal transmission, the channel processing resource utilization rate should be selected. The lowest-ranking satellite is designated as the satellite to which the satellite belongs.

[0017] In one embodiment, when the channel processing resource utilization rate of the satellite exceeds a correspondingly set threshold... In addition, the above method also includes:

[0018] The channel processing resource utilization rate of the home satellite is transmitted to multiple neighboring satellites via inter-satellite links, and the channel processing resource utilization rates of the neighboring satellites are assessed to determine whether they are below the corresponding set thresholds. Only when the channel processing resource utilization rate of adjacent satellites is lower At the same time, by adjusting the beam angle and / or tilt angle of adjacent satellites, it helps to cover the service area of ​​the home satellite and connect some user equipment in the service area to adjacent satellites to provide communication services;

[0019] The utilization rate of channel processing resources belonging to the satellite has dropped. In this case, the updated channel processing resource utilization rate of the home satellite is further sent to multiple neighboring satellites via inter-satellite links, and the beam angle and / or tilt angle of the neighboring satellites are adjusted to restore them to the initial state.

[0020] In one embodiment, the adjustment of the satellite beam's angle and tilt angle satisfies the following constraints:

[0021] Satellite beam angle and tilt angle Constrained within the curvature of the Earth, it is represented as:

[0022] ;

[0023] in, Indicates the satellite's orbital altitude. Indicates the Earth's radius;

[0024] Satellite beam angle and tilt angle Limited by the maximum Doppler frequency shift processed by user equipment , represented as:

[0025] ;

[0026] in, Indicates the center frequency of the downlink outgoing signal carrier. This represents the satellite's velocity in the Earth-centered, Earth-fixed coordinate system. At the speed of light, The azimuth angle represents the direction of motion of the user equipment relative to the satellite.

[0027] Satellite beam angle and tilt angle Limited by the minimum elevation angle of the user equipment , represented as:

[0028] .

[0029] A satellite system integrating communication and navigation, employing the aforementioned method for regulating satellite signals and resources, comprises: user equipment, a satellite, and a ground control station;

[0030] The user equipment is used to modulate and generate uplink inbound signals of different service types and transmit them according to its own service needs and the signal quality and channel processing resource utilization of the downlink outbound signals broadcast by each satellite. The uplink inbound signals include bidirectional positioning and timing service inbound signals composed of satellite shared synchronization headers and data segments, and communication service inbound signals composed of home satellite synchronization headers and data segments.

[0031] The satellite is used to receive inbound signals for bidirectional positioning and timing services based on the satellite's shared synchronization head, and to perform bidirectional positioning and timing service processing on the satellite or by forwarding the signals to the ground center station according to the satellite payload; and the home satellite corresponding to the home satellite synchronization head is also used to receive inbound signals for communication services, and to perform communication service processing on the satellite or by forwarding the signals to the ground center station according to the home satellite's satellite payload.

[0032] The ground control station is used to process bidirectional positioning, timing, and communication services according to the functional configuration of the satellite payload.

[0033] Furthermore, the user equipment consists of a user transceiver isolated antenna, an RF receiving module, a baseband signal processing module, an information processing module, and an RF transmitting module;

[0034] Among them, the user transceiver isolation antenna is used to receive downlink outbound signals broadcast by the satellite and transmit uplink inbound signals of different service types;

[0035] The radio frequency receiving module is used to perform down-conversion, analog-to-digital conversion, and filtering and amplification of the downlink outgoing signal;

[0036] The baseband signal processing module includes multiple receiving channels and one transmitting channel. The multiple receiving channels are used to receive downlink outgoing signals broadcast by multiple satellites in parallel. By demodulating and measuring the quality of the downlink outgoing signals, the module obtains the satellite number, channel processing resource utilization, user message information, and signal quality measurement values ​​carried in the downlink outgoing signals and sends them to the information processing module, which generates user incoming messages. The transmitting channel is used to receive user incoming messages and, according to different service types, frames, encodes, and modulates the user incoming messages to generate digital baseband uplink incoming signals.

[0037] The radio frequency (RF) transmitter module is used to perform digital-to-analog conversion, up-conversion, filtering, and amplification of the digital baseband uplink inbound signal, and output the processed uplink inbound signal to the user's transceiver isolation antenna for transmission.

[0038] Furthermore, the satellite payload includes transparent relay satellite payloads and regenerative relay satellite payloads; the transparent relay satellite payload is used to forward uplink inbound signals of different service types to the ground center station to complete the corresponding service processing, and forward outbound signals sent by the ground center station to the user equipment;

[0039] The regenerative transponder satellite payload is used to receive uplink inbound signals of different service types and sequentially perform signal acquisition, demodulation, and decoding. For bidirectional positioning and timing service inbound signals, the regenerative transponder satellite payload is also used to transmit the demodulated user information to the ground control station via a satellite-to-ground link, where the ground control station performs position calculation. For communication service inbound signals, the regenerative transponder satellite payload is also used to transmit the demodulated user valid messages to the satellite to which the recipient belongs via an inter-satellite link.

[0040] Furthermore, the regenerative transceiver satellite payload consists of a signal transceiver isolation antenna, an incoming signal processing module, a user information processing module, an inter-satellite signal transceiver module, and an outgoing signal generation and transmission module;

[0041] Among them, the signal transceiver isolation antenna is used to receive the uplink inbound signal transmitted by the user equipment and input it into the inbound signal processing module;

[0042] The incoming signal processing module consists of a low-noise amplifier unit, a down-conversion sampling unit, a first-type acquisition unit, a second-type acquisition unit, and a demodulation unit. The low-noise amplifier unit amplifies the uplink incoming signal. The down-conversion sampling unit performs down-conversion, analog-to-digital conversion, quantization, and filtering on the uplink incoming signal, and copies the processed baseband digital signal into two copies, sending each copy to one of the two acquisition units. The first-type and second-type acquisition units are respectively used to capture the spreading code of the satellite shared synchronization header corresponding to the bidirectional positioning and timing service incoming signal and the communication service incoming signal. The system retrieves the spreading code of the corresponding satellite synchronization header and sends the synchronization header acquisition information to the demodulation unit. The synchronization header acquisition information includes the position of the synchronization header's initial sampling point and the Doppler frequency shift of the incoming signal. The demodulation unit consists of multiple demodulation channels, which are used to allocate idle demodulation channel resources to the uplink incoming signal based on the current usage of each demodulation channel. The system also tracks, demodulates, measures, and decodes the data segment of the uplink incoming signal and outputs user information to the user information processing module. If there are no idle demodulation channel resources, the currently received uplink incoming signal is discarded.

[0043] The user information processing module receives user information output by the demodulation unit, including service type, valid user message, pseudorange, Doppler frequency shift, carrier-to-noise ratio, and channel processing resource utilization. After reframing the user information according to the service type, the module sends the reframed user information to the inter-satellite signal transceiver module for routing and distribution.

[0044] For user information in bidirectional positioning and timing services, the inter-satellite signal transceiver module transmits user information to the ground control station via the satellite-to-ground link, where the ground control station performs position calculation. For user information in communication services, the inter-satellite signal transceiver module transmits valid user messages to the satellite to which the recipient belongs via the inter-satellite link. Simultaneously, the inter-satellite signal transceiver module also receives outbound messages sent by other satellites via the inter-satellite link that need to be transmitted via the downlink of this satellite. After the outbound messages are sent to the user information processing module for parsing, the outbound messages are pushed into the message queue, waiting to be sent to the outbound signal generation and transmission module.

[0045] The outbound signal generation and transmission module is used to receive user outbound messages from the user information processing module, and after framing, encoding, modulation, digital-to-analog conversion and frequency conversion amplification of the user outbound messages, it generates downlink outbound signals and sends the downlink outbound signals to the user equipment via the signal transceiver isolation antenna.

[0046] Furthermore, when the satellite payload is a transparent transponder satellite payload, the ground center station is used to perform down-conversion, filtering, sampling quantization, acquisition, tracking, decoding, and communication service processing or two-way positioning timing service processing of the incoming signals of each beam, as well as encoding, modulation, digital-to-analog conversion, up-conversion, and amplification processing of the outgoing signals; when the satellite payload is a regenerative transponder satellite payload, the ground center station is only used to receive user information of the two-way positioning timing service transmitted by the regenerative transponder satellite payload and perform position calculation.

[0047] The aforementioned integrated satellite signal and resource control method and system for communication and navigation generates a bidirectional positioning and timing service inbound signal by modulating and generating a signal composed of a shared satellite synchronization header and data segments. This allows all satellites or their corresponding ground receiving links to receive signals based on the shared synchronization header, meeting the requirements of bidirectional positioning and timing services for multi-satellite beams and effectively ensuring the success rate and accuracy of bidirectional positioning and timing. Furthermore, the communication service inbound signal, composed of the home satellite synchronization header and data segments, ensures that signals can only be received by the home satellite or its corresponding ground receiving link. Other satellites or their corresponding ground receiving links cannot capture this communication service inbound signal, avoiding the occupation of other satellite signal processing channel resources and improving communication capacity. Therefore, compared to existing technologies, this application can generate uplink inbound signals of different service types based on user service requirements and the quality of received signals and channel processing resource utilization without increasing onboard or ground station processing resources. This achieves compatibility between communication services and bidirectional positioning and timing services, improving satellite communication capacity and the accuracy of bidirectional positioning and timing. Attached Figure Description

[0048] Figure 1 This is a flowchart illustrating a satellite signal and resource control method integrating communication and navigation in one embodiment;

[0049] Figure 2 This is a schematic diagram of the inbound signal format for bidirectional positioning timing service in one embodiment.

[0050] Figure 3 This is a schematic diagram of the inbound signal format for communication services in one embodiment;

[0051] Figure 4 This is a schematic diagram illustrating the process of adjusting the angle and / or tilt of adjacent satellite beams in one embodiment;

[0052] Figure 5 This is a schematic diagram of the beam angle and tilt angle of a satellite beam in one embodiment;

[0053] Figure 6 This is a schematic diagram of the user equipment composition in one embodiment;

[0054] Figure 7 This is a schematic diagram of the regenerative transponder satellite payload composition in one embodiment. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0056] In one embodiment, such as Figure 1 As shown, a method for integrated communication and navigation satellite signal and resource regulation is provided, including the following steps:

[0057] Step S1: Based on the service requirements of the user equipment and the signal quality and channel processing resource utilization of the downlink outgoing signals broadcast by each satellite, modulate and generate uplink inbound signals of different service types and transmit them; wherein, the uplink inbound signals include bidirectional positioning and timing service inbound signals composed of satellite shared synchronization headers and data segments, and communication service inbound signals composed of home satellite synchronization headers and data segments.

[0058] The format of the inbound signal for bidirectional positioning timing service is as follows: Figure 2 As shown, Figure 2 The shared synchronization header PN0 for all satellites is a spreading code sequence of a specified length. This shared synchronization header is identical for all satellites, allowing all satellites or their corresponding ground receiving links to receive signals based on it. This satisfies the multi-satellite beam requirements of two-way positioning and timing services, effectively guaranteeing the success rate and accuracy of two-way positioning and timing. The format of the inbound signal for communication services is as follows: Figure 3 As shown, Figure 3 China's home satellite geosynchronous head PN (Sat i Similarly, the spreading code sequence of a specified length is used. The home satellite synchronization header spreading code sequence is generated by the home satellite number as the initial phase of the spreading code generator polynomial. The signal can only be received by the home satellite or the ground receiving link corresponding to the home satellite. Other satellites or the ground receiving links corresponding to other satellites cannot capture the incoming signal of this communication service, thus avoiding the occupation of other satellite signal processing channel resources and improving communication capacity.

[0059] Step S2: For the inbound signal of the two-way positioning and timing service, each satellite receives the signal based on the satellite's shared synchronization head, and performs two-way positioning and timing service processing on the satellite payload or by forwarding the signal to the ground center station.

[0060] Step S3: For the incoming communication service signal, the signal is received through the home satellite corresponding to the home satellite synchronization header, and the communication service is processed on the satellite or forwarded to the ground center station according to the satellite payload of the home satellite.

[0061] In summary, the integrated satellite signal and resource regulation method provided in this application can modulate and generate uplink inbound signals of different service types according to user service requirements, the quality of received signals, and the utilization rate of channel processing resources without increasing on-board or ground station processing resources. This achieves compatibility between communication services and two-way positioning and timing services, improves satellite communication capacity, and enhances the accuracy of two-way positioning and timing.

[0062] In one embodiment, based on the user equipment's service requirements and the signal quality and channel processing resource utilization of the downlink outgoing signals broadcast by each satellite, uplink incoming signals of different service types are modulated and transmitted, including:

[0063] When a user equipment has a bidirectional positioning and timing service requirement, it receives downlink outgoing signals broadcast by three or more satellites, selects any one of the satellites as a synchronous satellite, modulates and generates a bidirectional positioning and timing service incoming signal composed of a shared synchronization header and data segment, and sends the bidirectional positioning and timing service incoming signal at the reference time mark of a certain frame of the downlink outgoing signal broadcast by the synchronous satellite.

[0064] When a user equipment has communication service requirements, it receives and measures downlink outgoing signals broadcast by one or more satellites. Based on the satellite number, channel processing resource utilization, and signal quality measurement values ​​carried in the downlink outgoing signal, it selects the home satellite and modulates and generates a communication service incoming signal consisting of a home satellite synchronization header and a data segment for transmission. The spreading code sequence of the home satellite synchronization header is generated by using the corresponding home satellite number as the initial phase of the spreading code generator polynomial. The signal quality measurement values ​​include signal quality-related measurements such as the carrier-to-noise ratio and Doppler shift of the downlink outgoing signal.

[0065] Specifically, this embodiment provides two methods for satellite attribution screening. In actual use, one or a combination of these methods can be used, including:

[0066] Method 1: Based on the satellite number carried in the downlink outgoing signal, the channel processing resource utilization rate, and the signal quality measurement value, calculate the selection probability of each satellite, and select the satellite with the highest probability value as the assigned satellite. The expression for calculating the selection probability is as follows:

[0067] ;

[0068] in, Indicates satellite Selection probability, subscript Indicates the satellite number; , and These are non-negative weighting coefficients, which can be flexibly configured. Indicates satellite Channel processing resource utilization rate Indicates satellite The number of demodulation channels currently in use. Indicates satellite The total number of normal demodulation channels; and These represent satellite measurements taken by the user equipment. The carrier-to-noise ratio and Doppler shift of the broadcast downlink outgoing signal. It is evident that the lower the channel processing resource utilization, the higher the carrier-to-noise ratio of the outgoing signal, and the smaller the Doppler shift, the greater the probability of being selected as the assigned satellite.

[0069] Method 2: When the user equipment continuously transmits multiple frames of communication service incoming signals and expects the home satellite to remain unchanged during signal transmission, select the channel to process resource utilization. The lowest-ranking satellite is designated as the satellite to which the satellite belongs.

[0070] In one embodiment, such as Figure 4 As shown, if a large number of user devices select a certain satellite As the home satellite, this results in a heavy workload for the satellite, meaning that the utilization rate of the home satellite's channel processing resources is high. Exceeding the corresponding set threshold In addition, the above method also includes:

[0071] By using inter-satellite links, the channel processing resource utilization rate of the satellites will be improved. Send to multiple adjacent satellites ;in, This represents the number of adjacent satellites. Configurable, for example, set to 90%;

[0072] Assess the utilization rate of channel processing resources of adjacent satellites. Is it below the corresponding set threshold? Only Below At the same time, by adjusting the beam angle and / or tilt angle of adjacent satellites, it helps to cover the service area of ​​the home satellite, and connects some user equipment in the service area to adjacent satellites to provide communication services, thereby achieving load balancing and reducing communication congestion; It is also configurable, for example, set to 60%;

[0073] The utilization rate of channel processing resources belonging to the satellite has dropped. In this case, the updated channel processing resource utilization rate of the home satellite is further sent to multiple neighboring satellites via inter-satellite links, and the beam angle and / or tilt angle of the neighboring satellites are adjusted to restore them to the initial state.

[0074] In one embodiment, the satellite beam's angle and tilt angle are as follows: Figure 5 As shown, the adjustment of the satellite beam's angle and tilt angle satisfies the following constraints, including:

[0075] (1) Angle of satellite beam and tilt angle Constrained within the curvature of the Earth, it is represented as:

[0076] ;

[0077] in, Indicates the satellite's orbital altitude. The radius of the Earth is 6378 km. This constraint ensures that all the energy of the outgoing beam is projected onto the ground, avoiding energy waste by projecting it into space.

[0078] (2) Angle of satellite beam and tilt angle Limited by the maximum Doppler frequency shift processed by user equipment , represented as:

[0079] ;

[0080] in, Indicates the center frequency of the downlink outgoing signal carrier. This represents the satellite's velocity in the Earth-centered, Earth-fixed coordinate system. At the speed of light, It represents the azimuth angle of the user equipment relative to the direction of motion of the satellite.

[0081] (3) Angle of satellite beam and tilt angle Limited by the minimum elevation angle of the user equipment By the Law of Sines, we can obtain:

[0082] .

[0083] Specifically, assuming the satellite orbital altitude is 1150km, the user's minimum elevation angle... It is 10°. It is 2.5GHz. It is 7.3 km / s. The maximum Doppler frequency shift is 60°. At ±15kHz, the maximum beamwidth and maximum tilt angle of the satellite beam were ±14° and 29°, respectively.

[0084] In one embodiment, a communication and navigation integrated satellite system is provided, which employs the above-described communication and navigation integrated satellite signal and resource regulation method. The system consists of user equipment, satellites, and a ground central station.

[0085] The user equipment is used to modulate and generate uplink inbound signals of different service types and transmit them according to its own service needs and the signal quality and channel processing resource utilization of the downlink outbound signals broadcast by each satellite. The uplink inbound signals include bidirectional positioning and timing service inbound signals composed of satellite shared synchronization headers and data segments, and communication service inbound signals composed of home satellite synchronization headers and data segments.

[0086] The satellite is used to receive inbound signals for bidirectional positioning and timing services based on the shared satellite synchronization head, and to perform bidirectional positioning and timing service processing on the satellite or by forwarding the signals to the ground center station according to the satellite payload; the home satellite corresponding to the home satellite synchronization head is also used to receive inbound signals for communication services, and to perform communication service processing on the satellite or by forwarding the signals to the ground center station according to the satellite payload of the home satellite.

[0087] The ground control station is used to process bidirectional positioning, timing, and communication services according to the functional configuration of the satellite payload.

[0088] The aforementioned integrated communication and navigation satellite system can modulate and generate uplink inbound signals of different service types according to user service requirements, the quality of received signals, and the utilization rate of channel processing resources without increasing on-board or ground station processing resources. This achieves compatibility between communication services and two-way positioning and timing services, improves satellite communication capacity, and enhances the accuracy of two-way positioning and timing.

[0089] Furthermore, such as Figure 6 As shown, the user equipment consists of a user transceiver isolated antenna, an RF receiving module, a baseband signal processing module, an information processing module, and an RF transmitting module.

[0090] Among them, the user transceiver isolation antenna is used to receive downlink outbound signals broadcast by the satellite and transmit uplink inbound signals of different service types.

[0091] The radio frequency receiving module is used to perform down-conversion, analog-to-digital conversion, and filtering and amplification of the downlink outgoing signal.

[0092] The baseband signal processing module includes multiple receiving channels and one transmitting channel. The multiple receiving channels are used to receive downlink outgoing signals broadcast by multiple satellites in parallel. By demodulating and measuring the quality of the downlink outgoing signals, the satellite number, channel processing resource utilization, user message information, and signal quality measurement values ​​carried in the downlink outgoing signals are obtained and sent to the information processing module, which generates user incoming messages. The transmitting channel is used to receive user incoming messages and, according to different service types, frame, encode, and modulate the user incoming messages to generate digital baseband uplink incoming signals.

[0093] The radio frequency (RF) transmitter module is used to perform digital-to-analog conversion, up-conversion, filtering, and amplification of the digital baseband uplink inbound signal, and output the processed uplink inbound signal to the user's transceiver isolation antenna for transmission.

[0094] Furthermore, satellite payloads can be carried on satellite platforms at any orbital altitude, including GEO (Geostationary Earth Orbit), MEO (Medium Earth Orbit), and LEO (Low Earth Orbit). Satellite payloads include transparent relay payloads and regenerative relay payloads.

[0095] Transparent repeater satellite payloads are used to forward uplink inbound signals of different service types to the ground control station for corresponding service processing, and to forward outbound signals sent by the ground control station to user equipment. In other words, the main function of a transparent repeater satellite payload is to forward outbound signals from the ground control station and inbound signals from user equipment; it does not perform digitization on the inbound and outbound signals, only frequency conversion, filtering, and amplification. A transparent repeater satellite payload consists of a signal transceiver isolation antenna and a frequency converter. The signal transceiver isolation antenna is a full-duplex integrated antenna with its beam center covering the ground, and the beam angle is adjustable. The frequency converter performs frequency conversion between the user's operating frequency (i.e., the uplink and downlink signal frequencies between the user and the satellite) and the satellite feed link operating frequency (i.e., the uplink and downlink signal frequencies between the satellite and the ground control station).

[0096] The regenerative transponder satellite payload is used to receive uplink inbound signals of different service types and sequentially perform signal acquisition, demodulation, and decoding. For bidirectional positioning and timing service inbound signals, the regenerative transponder satellite payload is also used to transmit the demodulated user information to the ground control station via a satellite-to-ground link, where the ground control station performs position calculation. For communication service inbound signals, the regenerative transponder satellite payload is also used to transmit the demodulated user valid messages to the satellite to which the recipient belongs via an inter-satellite link.

[0097] Furthermore, such as Figure 7 As shown, the regenerative transceiver satellite payload consists of a signal transceiver isolation antenna, an incoming signal processing module, a user information processing module, an inter-satellite signal transceiver module, and an outgoing signal generation and transmission module.

[0098] The signal transceiver isolation antenna is used to receive uplink incoming signals transmitted by user equipment and input them into the incoming signal processing module. Specifically, the signal transceiver isolation antenna is a full-duplex integrated antenna with its beam center covering the ground. The beam angle and tilt angle can be adjusted. The maximum beam angle and maximum tilt angle of the satellite beam are jointly determined by the curvature of the Earth, the maximum Doppler frequency shift that the user equipment can handle, and the minimum elevation angle of the user equipment.

[0099] The inbound signal processing module consists of a low-noise amplifier unit, a down-conversion sampling unit, a first-type acquisition unit, a second-type acquisition unit, and a demodulation unit. The system includes a low-noise amplifier unit for amplifying the uplink incoming signal; a down-conversion sampling unit for down-converting, analog-to-digital conversion, quantization, and filtering the uplink incoming signal, and copying the resulting baseband digital signal into two copies, which are then sent to two acquisition units; a first-type acquisition unit and a second-type acquisition unit for capturing the spreading code of the satellite shared synchronization header corresponding to the bidirectional positioning timing service incoming signal and the spreading code of the home satellite synchronization header corresponding to the communication service incoming signal, respectively, and sending the synchronization header acquisition information to the demodulation unit, which includes the synchronization header starting sampling point position and the Doppler frequency shift of the incoming signal; and a demodulation unit consisting of multiple demodulation channels for allocating idle demodulation channel resources to the uplink incoming signal based on the current usage of each demodulation channel, and for tracking, demodulating, measuring, and decoding the data segment of the uplink incoming signal, and outputting user information to the user information processing module; if there are no idle demodulation channel resources, the currently received uplink incoming signal is discarded.

[0100] Specifically, the demodulation unit will process the channel processing resource utilization. When reporting to the user information processing module, The reporting frequency can be periodic or event-triggered. For example, when... Below a certain threshold For example, 20% can be reported on a period of T1. Exceeding a certain threshold For example, 50%, or If the rate of change is rapid, such as an increase or decrease of 20% within 1 second, it should be reported immediately. The user information processing module will then optimize the utilization of channel processing resources. The downlink outgoing signal is broadcast to all user equipment within the coverage area of ​​this satellite beam.

[0101] The user information processing module receives user information output by the demodulation unit, including service type, valid user message, pseudorange, Doppler frequency shift, carrier-to-noise ratio, and channel processing resource utilization. After reframing the user information according to the service type, the module sends the reframed user information to the inter-satellite signal transceiver module for routing and distribution.

[0102] For user information in bidirectional positioning and timing services, the inter-satellite signal transceiver module transmits user information to the ground control station via the satellite-to-ground link, where the ground control station performs position calculation. For user information in communication services, the inter-satellite signal transceiver module transmits valid user messages to the satellite to which the recipient belongs via the inter-satellite link. Simultaneously, the inter-satellite signal transceiver module also receives outbound messages sent by other satellites via the inter-satellite link that need to be transmitted via the downlink of this satellite. After the outbound messages are sent to the user information processing module for parsing, the outbound messages are pushed into the message queue, waiting to be sent to the outbound signal generation and transmission module.

[0103] The outbound signal generation and transmission module is used to receive user outbound messages from the user information processing module, and after framing, encoding, modulation, digital-to-analog conversion and frequency conversion amplification of the user outbound messages, it generates downlink outbound signals and sends the downlink outbound signals to the user equipment via the signal transceiver isolation antenna.

[0104] Furthermore, when the satellite payload is a transparent transponder satellite payload, the ground center station is used to perform down-conversion, filtering, sampling quantization, acquisition, tracking, decoding, and communication service processing or two-way positioning timing service processing of the incoming signals of each beam, as well as encoding, modulation, digital-to-analog conversion, up-conversion, and amplification processing of the outgoing signals; when the satellite payload is a regenerative transponder satellite payload, the ground center station is only used to receive user information of the two-way positioning timing service transmitted by the regenerative transponder satellite payload and perform position calculation.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for integrated communication and navigation satellite signal and resource control, characterized in that, The method includes: Based on the service requirements of user equipment and the signal quality and channel processing resource utilization of the downlink outgoing signals broadcast by each satellite, uplink incoming signals of different service types are modulated and generated and transmitted; wherein, the uplink incoming signals include bidirectional positioning and timing service incoming signals composed of satellite shared synchronization headers and data segments, and communication service incoming signals composed of home satellite synchronization headers and data segments. For the bidirectional positioning and timing service incoming signal, each satellite receives the signal based on the satellite's shared synchronization head, and performs bidirectional positioning and timing service processing on-board or by forwarding the signal to the ground center station according to the satellite payload. For the communication service inbound signal, the signal is received through the home satellite corresponding to the home satellite synchronization header, and the communication service is processed on the satellite or forwarded to the ground center station according to the satellite payload of the home satellite. Based on the user equipment's service requirements and the signal quality and channel processing resource utilization of the downlink outgoing signals broadcast by each satellite, uplink incoming signals of different service types are modulated and transmitted, including: When the user equipment has a bidirectional positioning and timing service requirement, it receives downlink outgoing signals broadcast by three or more satellites, and after selecting any one of the satellites as a synchronous satellite, it modulates and generates a bidirectional positioning and timing service incoming signal composed of a shared synchronization header and data segment of the satellites, and sends the bidirectional positioning and timing service incoming signal at the reference time mark of a certain frame of the downlink outgoing signal broadcast by the synchronous satellite. When a user equipment has communication service requirements, it receives and measures downlink outgoing signals broadcast by one or more satellites. Based on the satellite number, channel processing resource utilization rate, and signal quality measurement values ​​carried in the downlink outgoing signals, it performs satellite selection and modulates and generates a communication service incoming signal consisting of a home satellite synchronization header and a data segment for transmission. The spreading code sequence of the home satellite synchronization header is generated by using the corresponding home satellite number as the initial phase of the spreading code generator polynomial. The signal quality measurement values ​​include the carrier-to-noise ratio and Doppler shift of the downlink outgoing signal.

2. The integrated satellite signal and resource control method according to claim 1, characterized in that, Satellite attribution is determined based on the satellite number carried in the downlink outgoing signal, channel processing resource utilization, and signal quality measurements, including: Based on the satellite number carried in the downlink outgoing signal, the channel processing resource utilization rate, and the signal quality measurement value, the selection probability of each satellite is calculated, and the satellite with the highest probability value is selected as the assigned satellite; wherein, the expression for calculating the selection probability is: ； in, Indicates satellite Selection probability, subscript Indicates the satellite number; , and These are non-negative weighting coefficients; Indicates satellite Channel processing resource utilization rate Indicates satellite The number of demodulation channels currently in use. Indicates satellite The total number of normal demodulation channels; and These represent satellite measurements taken by the user equipment. The carrier-to-noise ratio and Doppler shift of the broadcast downlink outgoing signal; Alternatively, when a user equipment continuously transmits multiple frames of inbound communication service signals and expects the home satellite to remain unchanged during signal transmission, the channel processing resource utilization rate should be selected. The lowest-ranking satellite is designated as the satellite to which the satellite belongs.

3. The integrated satellite signal and resource control method according to claim 2, characterized in that, When the channel processing resource utilization rate of the satellite exceeds the corresponding set threshold The method further includes: The channel processing resource utilization rate of the home satellite is transmitted to multiple neighboring satellites via inter-satellite links, and the channel processing resource utilization rates of the neighboring satellites are assessed to determine whether they are below a corresponding set threshold. Only when the channel processing resource utilization rate of the adjacent satellite is lower than At the same time, by adjusting the beam angle and / or tilt angle of adjacent satellites, the service area of ​​the home satellite can be covered, and some user equipment in the service area can be connected to adjacent satellites to provide communication services; The utilization rate of channel processing resources for the satellite in question has decreased. In this case, the updated channel processing resource utilization rate of the home satellite is further sent to multiple neighboring satellites via inter-satellite links, and the beam angle and / or tilt angle of the neighboring satellites are adjusted to restore them to their initial state.

4. The satellite signal and resource control method integrating communication and navigation according to claim 3, characterized in that, The adjustment of the satellite beam's angle and tilt angle must satisfy the following constraints, including: Satellite beam angle and tilt angle Constrained within the curvature of the Earth, it is represented as: ； in, Indicates the satellite's orbital altitude. Indicates the Earth's radius; Satellite beam angle and tilt angle Limited by the maximum Doppler frequency shift processed by user equipment , is represented as: ； in, Indicates the center frequency of the downlink outgoing signal carrier. This represents the satellite's velocity in the Earth-centered, Earth-fixed coordinate system. At the speed of light, The azimuth angle represents the direction of motion of the user equipment relative to the satellite. Satellite beam angle and tilt angle Limited by the minimum elevation angle of the user equipment , is represented as: 。 5. A satellite system integrating communication and navigation using the method described in any one of claims 1-4, characterized in that, The system includes: user equipment, satellites, and a ground control station; The user equipment is used to modulate and generate uplink inbound signals of different service types and transmit them according to its own service needs and the signal quality and channel processing resource utilization of the downlink outbound signals broadcast by each satellite; wherein, the uplink inbound signals include bidirectional positioning and timing service inbound signals composed of satellite shared synchronization headers and data segments, and communication service inbound signals composed of home satellite synchronization headers and data segments. The satellite is used to receive bidirectional positioning and timing service inbound signals based on the shared synchronization head of the satellite, and to perform bidirectional positioning and timing service processing on the satellite or by forwarding the signals to the ground center station according to the satellite payload; and the home satellite corresponding to the synchronization head of the home satellite is also used to receive communication service inbound signals, and to perform communication service processing on the satellite or by forwarding the signals to the ground center station according to the satellite payload of the home satellite. The ground control station is used to process bidirectional positioning and timing services and communication services according to the functional configuration of the satellite payload.

6. A satellite system integrating communication and navigation according to claim 5, characterized in that, The user equipment consists of a user transceiver isolation antenna, a radio frequency receiving module, a baseband signal processing module, an information processing module, and a radio frequency transmitting module; The user transceiver isolation antenna is used to receive downlink outbound signals broadcast by the satellite and to transmit uplink inbound signals of different service types. The radio frequency receiving module is used to perform down-conversion, analog-to-digital conversion, and filtering and amplification processing of the downlink outgoing signal; The baseband signal processing module includes multiple receiving channels and one transmitting channel. The multiple receiving channels are used to receive downlink outgoing signals broadcast by multiple satellites in parallel. By demodulating and measuring the quality of the downlink outgoing signals, the satellite number, channel processing resource utilization rate, user message information, and signal quality measurement values ​​carried in the downlink outgoing signals are obtained and sent to the information processing module, which generates user incoming messages. The transmitting channel is used to receive the user incoming messages and, according to different service types, frame, encode, and modulate the user incoming messages to generate digital baseband uplink incoming signals. The radio frequency transmission module is used to perform digital-to-analog conversion, up-conversion, filtering and amplification of the digital baseband uplink inbound signal, and output the processed uplink inbound signal to the user's transceiver isolation antenna for transmission.

7. A satellite system integrating communication and navigation according to claim 5, characterized in that, The satellite payload includes a transparent relay satellite payload and a regenerative relay satellite payload; the transparent relay satellite payload is used to forward uplink inbound signals of different service types to the ground center station to complete the corresponding service processing, and forward outbound signals sent by the ground center station to the user equipment; The regenerative transponder satellite payload is used to receive uplink inbound signals of different service types and sequentially perform signal acquisition, demodulation, and decoding. Specifically, for bidirectional positioning and timing service inbound signals, the regenerative transponder satellite payload is also used to transmit the demodulated user information to the ground control station via a satellite-to-ground link, where the ground control station performs position calculation. For communication service inbound signals, the regenerative transponder satellite payload is also used to transmit the demodulated valid user messages to the satellite to which the recipient belongs via an inter-satellite link.

8. A satellite system integrating communication and navigation according to claim 7, characterized in that, The regenerative transceiver satellite payload consists of a signal transceiver isolation antenna, an inbound signal processing module, a user information processing module, an inter-satellite signal transceiver module, and an outbound signal generation and transmission module. The signal transceiver isolation antenna is used to receive the uplink inbound signal transmitted by the user equipment and input it into the inbound signal processing module. The inbound signal processing module comprises a low-noise amplifier unit, a down-conversion sampling unit, a first type of acquisition unit, a second type of acquisition unit, and a demodulation unit. The low-noise amplifier unit amplifies the uplink inbound signal. The down-conversion sampling unit performs down-conversion, analog-to-digital conversion, quantization, and filtering on the uplink inbound signal, and copies the processed baseband digital signal into two copies, sending each copy to one of the two acquisition units. The first and second type of acquisition units are respectively used to capture the spreading code of the satellite shared synchronization header corresponding to the bidirectional positioning and timing service inbound signal and the communication service inbound signal. The system receives the spreading code of the home satellite synchronization header corresponding to the uplink incoming signal and sends the synchronization header acquisition information to the demodulation unit. The synchronization header acquisition information includes the position of the synchronization header starting sampling point and the Doppler frequency shift of the incoming signal. The demodulation unit consists of multiple demodulation channels, which are used to allocate idle demodulation channel resources to the uplink incoming signal according to the current usage of each demodulation channel. The system also tracks, demodulates, measures, and decodes the data segment of the uplink incoming signal and outputs user information to the user information processing module. If there are no idle demodulation channel resources, the currently received uplink incoming signal is discarded. The user information processing module is used to receive user information output by the demodulation unit, including service type, valid user message, pseudorange, Doppler frequency shift, carrier-to-noise ratio, and channel processing resource utilization. After reframing the user information according to the service type, the reframed user information is sent to the inter-satellite signal transceiver module for routing and distribution. For user information in bidirectional positioning and timing services, the inter-satellite signal transceiver module transmits user information to the ground control station via a satellite-to-ground link, where the ground control station performs position calculation. For user information in communication services, the inter-satellite signal transceiver module transmits valid user messages to the satellite to which the recipient belongs via an inter-satellite link. Simultaneously, the inter-satellite signal transceiver module also receives outbound messages from other satellites that need to be transmitted via the downlink of this satellite, sends these outbound messages to the user information processing module for parsing, and then pushes the outbound messages into a message queue, awaiting transmission to the outbound signal generation and transmission module. The outbound signal generation and transmission module is used to receive user outbound messages from the user information processing module, and after performing framing, encoding, modulation, digital-to-analog conversion and frequency conversion amplification on the user outbound messages, generate downlink outbound signals, and send the downlink outbound signals to user equipment via the signal transceiver isolation antenna.

9. A satellite system integrating communication and navigation according to claim 7, characterized in that, When the satellite payload is a transparent transponder satellite payload, the ground center station is used to perform down-conversion, filtering, sampling quantization, acquisition, tracking, decoding, and communication service processing or two-way positioning timing service processing of the incoming signals of each beam, as well as encoding, modulation, digital-to-analog conversion, up-conversion, and amplification processing of the outgoing signals; when the satellite payload is a regenerative transponder satellite payload, the ground center station is only used to receive user information of the two-way positioning timing service sent by the regenerative transponder satellite payload and perform position calculation.

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