Satellite phased array beam scanning application method

Abstract

The application provides a satellite phased array beam scanning application method, which comprises the following steps: in a broadcast time slot, a phased array beam covers each wave position according to a scanning pattern, when covering a wave position where a satellite terminal is located, receiving a satellite-ground notification by the satellite terminal; the satellite terminal acquires common control channel resources and scanning pattern information in the satellite-ground notification; in a common control time slot, performing random access; after the random access succeeds, allocating a service beam, dynamically generating a scanning pattern of a service time slot and a time slot allocation plan during a wave position residence period according to position information and service demand of the satellite terminal, and satisfying communication demand. Through fine division and dynamic allocation of time slot resources, in combination with design of a phased array scanning strategy, the method realizes wide-area concurrent service of a satellite to multiple ground terminals, random access and on-demand coverage, and guarantees efficient utilization of phased array beam resources.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of satellite communication, and relates to a satellite phased array beam, in particular to a satellite phased array beam scanning application method. BACKGROUND

[0002] With the rapid development of satellite communication systems, the types of satellite terminals are increasing, the demand for services is rising sharply, and the limited available resources on the satellite make the imbalance between supply and demand of satellite communication resources increasingly prominent. The spatio-temporal unevenness of service distribution may cause the existing resource allocation method to result in the situation of "uneven work and rest" and "overwork and underwork" of each beam. Therefore, how to improve the transmission capacity of the satellite network and flexibly allocate available resources has become a problem to be solved.

[0003] The agile beam technology realized by using the phased array antenna is a technology capable of flexibly allocating resources developed on this basis. The agile beam technology aims to realize the coverage of the traditional multi-beam system by using fewer beam jumps, thereby improving the actual throughput and resource utilization efficiency of the system. The basic idea of the agile beam technology is to allocate the frequency bandwidth resources under different time slots to the users (i.e. wave positions) in the coverage range of different beams by using the time slicing technology, that is, at any moment, the beam can only serve one wave position. The agile beam technology can meet the high-gain coverage demand of any point in the field of view range, and has become a necessary configuration for the satellite communication system to support the dynamic distribution of service terminals in a large area, flexible communication, and improve the anti-interference ability of the system.

[0004] In the method of realizing satellite communication by using the technology of agile beam, the pre-injection method is usually used to realize user access. The patent "a satellite jump beam tracking coverage method" (CN202310462023.3) divides the phased array antenna into scanning and staring two working modes. In the scanning mode, the beam formed by the phased array antenna covers the wide area wave position by wave, and when it scans to the wave position of the satellite terminal, the satellite terminal sends an access application, and the phased array antenna converts from the scanning mode to the staring mode. In the staring mode, the satellite terminal periodically sends the location information to guide the phased array antenna to track it. After the communication is completed, the satellite terminal sends an access completion, and the phased array antenna converts from the staring mode to the scanning mode. The method can realize the tracking of the satellite to the ground terminal and guarantee the quality of the communication. The patent "a satellite jump beam agile coverage method" (CN202310461986.1) uses a group of receiving / transmitting beams of the satellite phased array antenna as access beams, and other groups of receiving / transmitting beams as service beams. The access beams are scanned wave by wave in the satellite ground field of view, and the receiving beam and the transmitting beam maintain a fixed polling delay during the scanning to guarantee the satellite terminal access. After the access is successful, the service beams are allocated to the terminal, and the service beam scanning pattern is generated. The satellite terminal is switched from the access beam to the service beam, the service beam signal acquisition is completed, and the service data transmission and reception are realized. The method can realize the on-demand coverage of the satellite to the ground terminal and guarantee the efficient use of the beam resources.

[0005] The above two existing technologies, the first one needs the control center to know the time and approximate position of the terminal in the airspace in advance, supports the wide beam function through the scanning mode, has strict requirements on the sending time of the terminal access application, cannot meet the demand of the terminal random access, and can only serve a single terminal cluster after the access is successful, and cannot realize the multi-user wide area concurrent service. The second one scans the access beam wave by wave in the full field of view, and the access beam only completes the terminal access and coordinates the service beam to provide data service according to the access condition. At the same time, the terminal needs to maintain a fixed polling delay according to the scanning receiving beam and the transmitting beam to access, has strict requirements on the sending time of the terminal access application and the receiving of the access response, cannot meet the demand of the terminal flexible access, and needs to use at least two groups of phased array receiving / transmitting beams to realize the terminal access and service, and cannot meet the demand of the terminal access and service in the single beam condition. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present application is to provide a satellite phased array beam scanning application method, which solves the technical problem that the utilization efficiency of the phased array beam resources in the prior art needs to be further improved.

[0007] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0008] A satellite phased array beam scanning application method, which is performed according to the following steps:

[0009] Step one, the network management center configures the scanning pattern of the satellite-borne phased array antenna to the satellite-borne network control, the satellite-borne network control generates the uplink synchronization time slot scanning pattern and the uplink common control time slot scanning pattern, and controls the receiving beam to perform wave position hopping, and the residence time of each wave position is the same.

[0010] Step two, the network management center configures the scanning pattern of the satellite-borne phased array antenna to the satellite-borne network control, the satellite-borne network control generates the downlink synchronization time slot scanning pattern and the downlink broadcast time slot scanning pattern, and controls the transmitting beam to perform wave position hopping, and the residence time of each wave position is the same.

[0011] During the residence, the satellite-borne network control broadcasts the satellite-ground announcement to the current coverage wave position through the downlink broadcast time slot, and the satellite-ground announcement includes synchronization information, current common control channel resources and scanning pattern information.

[0012] Step three, after the satellite terminal is started, it waits in the transmitting beam of the satellite-borne phased array antenna, when the transmitting beam scans to the location, the satellite terminal captures the transmitting beam signal, performs downlink synchronization, and receives the satellite-ground announcement.

[0013] Step four, according to the current common control channel resources and scanning pattern information in the satellite-ground announcement, the satellite terminal sends the access application containing the satellite terminal location information to the satellite-borne network control of the satellite terminal in the uplink common control time slot.

[0014] Step five, after the satellite-borne network control receives the access application, it allocates the receiving service resources and the transmitting service resources to the satellite terminal, dynamically generates the scanning pattern of the service time slot and the time slot allocation plan during the residence of each wave position, according to the satellite terminal location information in the access application and the service demand of the satellite terminal, and controls the receiving service beam and the transmitting service beam to perform hopping according to the scanning pattern of the service time slot.

[0015] Step six, the satellite-borne network control sends the service time slot resources allocated to the satellite terminal to the satellite terminal through the transmitting beam of the satellite-borne phased array antenna.

[0016] Step seven, the satellite terminal calculates the sending time of the service data according to the time slot allocation plan, sends the service data at the time, and realizes the service communication.

[0017] Step eight, after the service communication is completed, the satellite terminal sends the access completion to the satellite-borne network control.

[0018] Step nine, after the satellite-borne network control receives the access completion, it recovers the service time slot resources occupied by the satellite terminal, updates the scanning pattern of the service time slot and the time slot allocation plan during the residence of each wave position, and controls the phased array receiving beam and the transmitting beam to perform wave position hopping according to the new scanning pattern.

[0019] Compared with the prior art, the present application has the following technical effects:

[0020] (I) The method of the present application realizes wide-area concurrent service of a satellite to multiple ground terminals, random access and on-demand coverage by fine division and dynamic allocation of time slot resources, combined with the design of phased array scanning strategy, and guarantees efficient utilization of phased array beam resources.

[0021] (II) The method of the present application integrates multiple beam completion functions into one beam completion, supports flexible definition of coverage range according to coverage requirements, and supports random access of user terminals.

[0022] (III) The method of the present application has the characteristics of simple establishment, high reliability, strong operability and strong continuous service capability, and supports multiple application scenario communication requirements. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a schematic diagram of a satellite phased array beam scanning application method scenario in the embodiments.

[0024] Figure 2 FIG. 3 is a schematic diagram of a phased array beam communication interaction process in the embodiments.

[0025] Figure 3 FIG. 4 is a schematic diagram of phased array beam time slot division in the embodiments.

[0026] Figure 4 FIG. 6 is a schematic diagram of the running process of the satellite phased array beam scanning application method in the embodiments.

[0027] The specific content of the present application is further explained and described in detail below in combination with the embodiments. DETAILED DESCRIPTION

[0028] It should be noted that all the devices and technologies in the present application, unless otherwise specified, all use the devices and technologies known in the prior art.

[0029] The application provides a satellite phased array beam scanning application method. The method divides the receiving beam operation time of the phased array antenna into an uplink synchronization time slot, a public control time slot and an uplink service time slot, and divides the transmitting beam operation time of the phased array antenna into a downlink synchronization time slot, a broadcast time slot and a downlink service time slot. In the broadcast time slot, the phased array transmitting beam covers each wave position according to a scanning pattern, and when covering the wave position where the satellite terminal is located, the satellite terminal receives a satellite-ground announcement; the satellite terminal performs random access in the public control time slot according to the public control channel resource and the scanning pattern information in the satellite-ground announcement; after the random access succeeds, a service beam is allocated, the scanning pattern of the service time slot and the time slot allocation plan during the wave position residence period are dynamically generated according to the position information and the service demand of the satellite terminal, and the communication demand is met. The application is suitable for high-orbit and low-orbit satellites with on-board processing technology and phased array antennas, and can realize wide-area concurrent service of the satellite to multiple ground terminals, random access and on-demand coverage by fine division and dynamic allocation of time slot resources and design of the phased array scanning strategy, thereby guaranteeing the efficient use of the phased array beam resources.

[0030] The specific embodiments of the application are given below, and it should be noted that the application is not limited to the following specific embodiments, and any equivalent transformation made on the basis of the technical scheme of the application falls within the protection scope of the application.

[0031] Embodiment:

[0032] The embodiment provides a satellite phased array beam scanning application method, which is applied to high-orbit and low-orbit satellites with on-board processing technology and phased array antennas. The satellite is provided with a satellite-borne phased array antenna, a satellite-borne network controller, a satellite-borne switch, a satellite-borne demodulator and a satellite-borne modulator, the receiving beam and the transmitting beam of the satellite-borne phased array antenna are controlled by the satellite-borne network controller, and the access process is jointly completed by the satellite, the network management center on the ground and the satellite terminal.

[0033] In the embodiment, specifically, the satellite phased array beam scanning application method scene is as shown in Figure 1 The method can be used for high-orbit and low-orbit satellites with on-board processing technology and phased array antennas. Figure 1 1-8 indicate different wave positions, the satellite is provided with a satellite-borne phased array antenna, a satellite-borne network controller, a satellite-borne switch, a satellite-borne demodulator and a satellite-borne modulator, and the receiving beam and the transmitting beam of the satellite-borne phased array antenna are controlled by the satellite-borne network controller. The access process is jointly completed by the satellite, the network management center on the ground and the satellite terminal.

[0034] Specifically, the satellite network controller generates a downlink broadcast time slot scanning pattern according to the scanning pattern of the satellite phased array antenna configured by the network management center, and controls the phased array transmitting beam to scan each wave position. When the satellite terminal at wave position 4 is under guard, the satellite terminal receives the satellite-ground announcement when the phased array transmitting beam scans to the position, calculates the transmission time of the access application according to the public control channel resource and scanning pattern information in the announcement; when the phased array receiving beam scans to wave position 4, the satellite terminal sends the access application to the satellite network controller through the uplink public control time slot; the satellite network controller generates the uplink and downlink service time slot scanning pattern according to the terminal position information and service demand in the application, and performs on-demand coverage on wave position 4 and wave position 8 where the satellite terminal exists. The satellite terminal transmits service data when the phased array receiving beam covers the wave position, and the phased array transmitting beam scans according to the downlink service time slot scanning pattern and synchronously irradiates the corresponding wave position during data transmission.

[0035] As shown in Figure 2 , the method proceeds according to the following steps:

[0036] Step one, the network management center configures the scanning pattern of the satellite phased array antenna to the satellite network controller, and the satellite network controller generates the uplink synchronization time slot scanning pattern and the uplink public control time slot scanning pattern, and controls the receiving beam to jump from wave position to wave position, and the residence time of each wave position is the same.

[0037] Step two, the network management center configures the scanning pattern of the satellite phased array antenna to the satellite network controller, and the satellite network controller generates the downlink synchronization time slot scanning pattern and the downlink broadcast time slot scanning pattern, and controls the transmitting beam to jump from wave position to wave position, and the residence time of each wave position is the same.

[0038] During the residence period, the satellite network controller broadcasts the satellite-ground announcement to the current coverage wave position through the downlink broadcast time slot, and the satellite-ground announcement includes synchronization information, current public control channel resource and scanning pattern information.

[0039] Step three, after the satellite terminal is powered on, it is under guard of the transmitting beam of the satellite phased array antenna, and when the transmitting beam scans to the position, the satellite terminal captures the transmitting beam signal, performs downlink synchronization, and receives the satellite-ground announcement.

[0040] Step four, the satellite terminal sends the access application containing the satellite terminal position information to the satellite network controller of the satellite terminal in the uplink public control time slot according to the current public control channel resource and scanning pattern information in the satellite-ground announcement.

[0041] Step five, after the satellite network controller receives the access application, it allocates the receiving service resource and the transmitting service resource for the satellite terminal, dynamically generates the scanning pattern of the service time slot and the time slot allocation plan during the residence period of each wave position according to the satellite terminal position information and the service demand of the satellite terminal in the access application, and controls the receiving service beam and the transmitting service beam to perform jumping according to the scanning pattern of the service time slot.

[0042] In this specific embodiment, such as Figure 3 As shown, Figure 3 This represents the specific time slot allocation within N frames, where the j-th time slot of the i-th frame is determined by t. ij If we express this as T, then the set of synchronization time slots T can be represented as T = {t} 11 ,t 21 ,t 31 ,…,t N1 The set C of uplink common control slots / downlink broadcast slots can be represented as C = {t} 12 ,t 22 ,t 32 ,…,t N2 The set B of service time slots can be represented as B = {t} 13 ,t 14 ,…,t 1M ,t 23 ,t 24 ,…,t 2M ,t N3 ,t N4 ,…,t NM Within set T, the satellite-borne network control phased array receiving beam transitions according to the uplink synchronization time slot scanning pattern, while the phased array transmitting beam transitions according to the downlink synchronization time slot scanning pattern. Within set C, the satellite-borne network control phased array receiving beam transitions according to the uplink common control time slot scanning pattern, while the phased array transmitting beam transitions according to the broadcast time slot scanning pattern. Within set B, the satellite-borne network control phased array receiving beam transitions according to the uplink service time slot scanning pattern, while the phased array transmitting beam transitions according to the downlink service time slot scanning pattern.

[0043] Step six: The onboard network controller transmits beams through the onboard phased array antenna to send the service time slot resources allocated to the satellite terminal.

[0044] Step 7: The satellite terminal calculates the transmission time of the service data according to the time slot allocation plan, and transmits the service data at that time to realize service communication.

[0045] Step 8: After the service communication ends, the satellite terminal sends an access completion message to the onboard network controller.

[0046] Step nine: After the satellite network controller receives the access information, it reclaims the service time slot resources occupied by the satellite terminal, updates the scanning pattern of the service time slots and the time slot allocation plan during the dwell period of each wave position, and controls the phased array receiving beam and transmitting beam to perform wave position-by-wave switching according to the new scanning pattern.

[0047] As a preferred scheme of the embodiment, the phased array receiving beams and the phased array transmitting beams are scheduled and managed in units of frames, one frame is composed of M time slots, and a scheduling period is defined as the length of the frame; the phased array receiving beams are divided into 1 uplink synchronization time slot, 1 uplink common control time slot and M-2 uplink service time slots in one scheduling period; and the phased array transmitting beams are divided into 1 downlink synchronization time slot, 1 downlink broadcast time slot and M-2 downlink service time slots in one scheduling period.

[0048] Further preferably, the uplink synchronization time slot is used by the satellite terminals in a shared manner, the uplink common control time slot is used by the satellite terminals in a contention manner, and the uplink service time slots are managed in one scheduling period and are allocated and used by the satellite terminals through the on-board network control.

[0049] Further preferably, the downlink synchronization time slot and the downlink broadcast time slot are used by the satellite terminals in a shared manner, and the downlink service time slots are managed in one scheduling period and are allocated and used by the satellite terminals through the on-board network control.

[0050] As a preferred scheme of the embodiment, the wave position is a region projected on the ground by the phased array receiving beams and the phased array transmitting beams; the scanning pattern is composed of a wave position sequence and a dwell time; and the receiving beams and the transmitting beams of the on-board phased array antenna are switched among different wave positions in the order given by the wave position sequence.

[0051] Further preferably, the on-board network control can generate multiple scanning patterns according to the time slot types, and the receiving beams and the transmitting beams of the on-board phased array antenna are switched only according to the scanning pattern corresponding to the current time slot in different time slots.

[0052] In the embodiment, as shown in Figure 4 as shown in Figure 4 FIG. 1 is a flowchart of a satellite phased array beam scanning application method, which comprises the following steps. First, the network management center configures an antenna scanning pattern to the on-board network control, the on-board network control generates uplink synchronization, uplink control, downlink synchronization and downlink broadcast scanning patterns according to the configured scanning pattern, and sends a beam pointing control instruction according to the wave position scanning pattern. The satellite terminals receive a satellite-ground announcement in the broadcast time slot, and send an access application containing the terminal position information to the on-board network control of the satellite through the uplink common control time slot according to the public control channel resource and the scanning pattern information in the announcement. The on-board network control performs an access control process according to the user type, priority and resource demand after receiving the access application, and allocates time-frequency resources to the satellite terminal if the satellite terminal meets the access conditions, updates the uplink and downlink service scanning patterns, and sends a beam pointing control instruction.

Claims

1. A method for satellite phased array beam scanning applications, characterized in that, This method is performed according to the following steps: Step 1: The network management center configures the scanning pattern of the satellite phased array antenna to the satellite network controller. The satellite network controller generates the uplink synchronization time slot scanning pattern and the uplink common control time slot scanning pattern, and controls the receiving beam to perform wave-by-wave position switching, with the same dwell time on each wave position. Step 2: The network management center configures the scanning pattern of the satellite phased array antenna to the satellite network controller. The satellite network controller generates the downlink synchronization time slot scanning pattern and the downlink broadcast time slot scanning pattern, and controls the transmission beam to perform wave-by-wave position switching, with the dwell time on each wave position being the same. During the stay, the onboard network control broadcasts satellite-to-ground announcements to the current coverage position via downlink broadcast time slots. The satellite-to-ground announcements include synchronization information, current common control channel resources, and scan pattern information. Step 3: After the satellite terminal is powered on, it monitors the transmitted beam of the onboard phased array antenna. When the transmitted beam scans to its location, the satellite terminal captures the transmitted beam signal, performs downlink synchronization, and receives satellite-to-ground notifications. Step 4: Based on the current common control channel resources and scanning pattern information in the satellite-to-ground announcement, the satellite terminal sends an access request containing the satellite terminal's location information to the satellite-borne network controller within the uplink common control time slot. Step 5: After receiving the access request, the onboard network controller allocates receive and transmit service resources to the satellite terminal. Combining the satellite terminal location information and satellite terminal service requirements in the access request, it dynamically generates a scan pattern for service time slots and a time slot allocation plan for each wave position during its dwell period. It then controls the receive and transmit service beams to switch according to the scan pattern of the service time slots. Step 6: The onboard network controller transmits beams through the onboard phased array antenna to send the service time slot resources allocated to the satellite terminal to the satellite terminal; Step 7: The satellite terminal calculates the transmission time of the service data according to the time slot allocation plan, and transmits the service data at that time to realize service communication; Step 8: After the service communication ends, the satellite terminal sends an access completion message to the onboard network control. Step nine: After the satellite network controller receives the access information, it reclaims the service time slot resources occupied by the satellite terminal, updates the scanning pattern of the service time slots and the time slot allocation plan during the dwell period of each wave position, and controls the phased array receiving beam and transmitting beam to perform wave position-by-wave switching according to the new scanning pattern.

2. The satellite phased array beam scanning application method as described in claim 1, characterized in that, The phased array receive and transmit beams are scheduled and managed in frames. One frame consists of M time slots, and the scheduling period is defined as the frame duration. The phased array receive beam is divided into 1 uplink synchronization time slot, 1 uplink common control time slot, and M-2 uplink service time slots within one scheduling period. The phased array transmit beam is divided into 1 downlink synchronization time slot, 1 broadcast time slot, and M-2 downlink service time slots within one scheduling period.

3. The satellite phased array beam scanning application method as described in claim 2, characterized in that, The uplink synchronization time slot is used by the satellite terminal in a shared manner, the uplink common control time slot is used by the satellite terminal in a contention manner, and the uplink service time slot is managed according to one scheduling cycle and allocated by the satellite terminal through the onboard network control.

4. The satellite phased array beam scanning application method as described in claim 2, characterized in that, The downlink synchronization time slot and the downlink broadcast time slot are shared by the satellite terminal. The downlink service time slot is managed according to one scheduling cycle and is allocated and used by the satellite terminal through the onboard network control.

5. The satellite phased array beam scanning application method as described in claim 1, characterized in that, A wave position is an area projected onto the Earth's surface by the phased array's receiving and transmitting beams; a scanning pattern consists of a wave position sequence and a dwell time. The receiving and transmitting beams of the spaceborne phased array antenna jump between different wave positions in the order given by the wave position sequence.

6. The satellite phased array beam scanning application method as described in claim 5, characterized in that, The aforementioned spaceborne network control can generate multiple scanning patterns according to the time slot type. In different time slots, the receiving and transmitting beams of the spaceborne phased array antenna only change according to the scanning pattern corresponding to the current time slot.

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