Satellite phased array beam scanning application method

Abstract

The invention provides a satellite phased array wave beam scanning application method, which comprises the following steps that: in a broadcast time slot, phased array transmitting wave beams cover wave positions one by one according to a scanning pattern, and when the wave positions of satellite terminals are covered, the satellite terminals receive satellite-ground announcements; the satellite terminal scans the pattern information according to the common control channel resources and the scanning pattern information in the satellite-ground announcement; carrying out random access in the common control time slot; and after the access is successful, allocating a service beam, and dynamically generating a scanning pattern of a service time slot and a time slot allocation plan during a beam position residence period according to the position information and service requirements of the satellite terminal, thereby meeting communication requirements. According to the method provided by the invention, through fine division and dynamic allocation of time slot resources and in combination with the design of a phased array scanning strategy, wide-area concurrent service, random access and on-demand coverage of a satellite to a plurality of ground terminals are realized, and efficient utilization of phased array beam resources is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of satellite communications, relates to a satellite phased array beam, and specifically relates to a satellite phased array beam scanning application method. Background Art

[0002] With the rapid development of satellite communication systems, there are more and more types of satellite terminals, and the demand for services has increased dramatically. The limited resources available on board have made the imbalance between supply and demand of satellite communication resources increasingly prominent. The uneven distribution of services in time and space means that the existing resource allocation method may cause "uneven work and rest" and "excessive busyness" in each beam. Therefore, how to improve the transmission capacity of satellite networks and flexibly allocate available resources has become an urgent problem to be solved.

[0003] Agile beam technology implemented by phased array antennas is a technology developed on this basis that can flexibly allocate resources. Agile beam technology aims to achieve coverage of traditional multi-beam systems with fewer beam hops, thereby improving the actual throughput and resource utilization efficiency of the system. The basic idea of ​​agile beam technology is to use time slicing technology to allocate frequency bandwidth resources in different time slots to users (i.e., wave positions) within different beam coverage ranges, that is, the beam can only serve one wave position at any time. The use of agile beam technology can meet the high-gain coverage requirements of any point within the field of view, and has become a necessary configuration for satellite communication systems to support dynamic distribution of service terminals in large areas, flexible communication, and enhance the system's anti-interference capabilities.

[0004] In the method of realizing satellite communication through agile beam technology, user access is usually achieved by pre-annotation. The patent "A tracking and coverage method for satellite beam hopping" (CN202310462023.3) divides the phased array antenna into two working modes: scanning and staring. In scanning mode, the beam formed by the phased array antenna covers each wave position in a wide area. When scanning to the wave position where the satellite terminal is located, the satellite terminal sends an access request, and the phased array antenna switches from scanning mode to staring mode. In staring mode, the satellite terminal periodically sends location information to guide the phased array antenna to track it. After the communication is completed, the satellite terminal sends access completion, and the phased array antenna switches from staring mode back to scanning mode. This method can realize the tracking guarantee of the satellite to the ground terminal and ensure the quality of communication. Patent "A satellite beam-hopping agile coverage method" (CN202310461986.1) One group of receive / transmit beams of the satellite-borne phased array antenna is the access beam, and the other group of receive / transmit beams is the service beam. The access beam is scanned wave-by-wave within the satellite's field of view of the ground. During the scanning, the receiving beam and the transmitting beam maintain a fixed polling delay to ensure the access of the satellite terminal. After successful access, a service beam is assigned to the terminal, and a service beam scanning pattern is generated. The satellite terminal switches from the access beam to the service beam, completes the service beam signal capture and realizes the reception and transmission of service data. This method can realize on-demand coverage of ground terminals by satellites and ensure efficient use of beam resources.

[0005] Of the above two existing technologies, the first one requires the control center to know the time and approximate location of the airspace where the terminal is located in advance, supports quasi-wide beam functions through scanning, has strict requirements on the sending time of the terminal access application, cannot meet the terminal's demand for random access, and can only serve a single-point terminal cluster after successful access, and cannot achieve multi-user wide-area concurrent services. The second access beam scanning is a full-field wave-by-wave position scanning. The access beam only completes the terminal access, and coordinates the service beam for data services according to the access situation. At the same time, the terminal is required to access according to the fixed polling delay maintained by the receiving beam and the transmitting beam during scanning. There are strict requirements for the sending time of the terminal access application and the reception of the access response, which cannot meet the terminal's demand for flexible access, and at least two sets of phased array receive / transmit beams are required to achieve terminal access and business services, which cannot meet the terminal access and service requirements in the single beam case. Summary of the invention

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

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

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

[0009] Step 1: The network management center configures the scanning pattern of the satellite-borne phased array antenna to the satellite-borne network control, which generates the uplink synchronization time slot scanning pattern and the uplink common control time slot scanning pattern, and controls the receiving beam to jump from one wave position to another, with the same dwell time on each wave position.

[0010] Step 2: The network management center configures the scanning pattern of the satellite-borne phased array antenna to the satellite-borne network control, which generates the downlink synchronization time slot scanning pattern and the downlink broadcast time slot scanning pattern, and controls the transmission beam to jump from one wave position to another, with the same dwell time on each wave position.

[0011] During the stay, the satellite network control broadcasts satellite-to-ground notifications to the current coverage wave position through the downlink broadcast time slot. The satellite-to-ground notifications include synchronization information, current public control channel resources and scanning pattern information.

[0012] Step 3: After the satellite terminal is powered on, it will monitor the transmitting beam of the onboard phased array antenna. When the transmitting beam scans to the location, the satellite terminal will capture the transmitting beam signal, perform downlink synchronization, and receive satellite-ground notifications.

[0013] Step 4: The satellite terminal sends an access request containing the satellite terminal location information to the satellite-borne network control of the satellite terminal in the uplink public control time slot according to the current public control channel resources and scanning pattern information in the satellite-ground notification.

[0014] Step 5: After receiving the access application, the satellite network control allocates receiving and transmitting service resources to the satellite terminal. Based on the satellite terminal location information and satellite terminal service requirements in the access application, it dynamically generates the scanning pattern of the service time slot and the time slot allocation plan during the residence period of each beam position, and controls the receiving and transmitting service beams to perform hopping according to the scanning pattern of the service time slot.

[0015] Step 6: The satellite network control sends a beam through the satellite phased array antenna to send the service time slot resources allocated to the satellite terminal to the satellite terminal.

[0016] Step 7: The satellite terminal calculates the time to send the service data according to the time slot allocation plan, and sends the service data at this time to achieve service communication.

[0017] Step 8: After the service communication is completed, the satellite terminal sends an access completion message to the onboard network control.

[0018] Step nine: After receiving the access completion, the satellite network control reclaims 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 period of each wave position, and controls the phased array receiving beam and transmitting beam to jump wave position by wave position according to the new scanning pattern.

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

[0020] (I) The method of the present invention realizes the satellite's wide-area concurrent service for multiple ground terminals, access on demand and coverage on demand, through the refined division and dynamic allocation of time slot resources, combined with the design of phased array scanning strategy, to ensure the efficient use of phased array beam resources.

[0021] (II) The method of the present invention 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 invention has the characteristics of being simple to establish and implement, having high reliability, strong operability and strong continuous service capability, and supports the communication requirements of various application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a scenario of a satellite phased array beam scanning application method in an embodiment.

[0024] Figure 2 The figure is a schematic diagram of the phased array beam communication interaction process of the embodiment.

[0025] Figure 3 Schematic diagram of phased array beam time slot division in an embodiment.

[0026] Figure 4 It is a schematic diagram of the operation flow of the satellite phased array beam scanning application method in the embodiment.

[0027] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0028] It should be noted that, unless otherwise specified, all devices and techniques in the present invention are devices and techniques known in the prior art.

[0029] The present invention provides a satellite phased array beam scanning application method. The method divides the beam receiving working 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 beam sending working 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 beam sends coverage of each wave position according to the scanning pattern. When the wave position where the satellite terminal is located is covered, the satellite terminal receives the satellite-to-ground notification; the satellite terminal performs random access in the public control time slot according to the public control channel resources and scanning pattern information in the satellite-to-ground notification; after successful access, the service beam is allocated, and 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 location information and service requirements of the satellite terminal to meet the communication requirements. The present invention is applicable to high-orbit and low-orbit satellites with on-board processing technology and phased array antennas. By finely dividing and dynamically allocating time slot resources and combining the design of phased array scanning strategies, the present invention can realize wide-area concurrent services for multiple ground terminals by satellites, and ensure on-demand access and on-demand coverage, thus ensuring efficient use of phased array beam resources.

[0030] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0031] Example:

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

[0033] Specifically, in this embodiment, the satellite phased array beam scanning application method scenario is as follows: Figure 1 As shown, the method can be used for high and low orbit satellites with on-board processing technology and phased array antennas; Figure 1 1 to 8 represent different beam positions. The satellite is equipped with a satellite-borne phased array antenna, a satellite-borne network control, a satellite-borne switch, a satellite-borne demodulator, and a satellite-borne modulator. The receiving and transmitting beams of the satellite-borne phased array antenna are controlled by the satellite-borne network control. The access process is completed jointly by the satellite and the ground network management center and the satellite terminal.

[0034] Specifically, the satellite network control 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 transmission beam to scan each wave position. When the phased array transmission beam scans to the location, the satellite terminal on duty at wave position 4 receives the satellite-ground notification, and calculates the sending time of the access application according to the public control channel resources and scanning pattern information in the notification; when the phased array receiving beam scans to wave position 4, the satellite terminal sends an access application to the satellite network control through the uplink public control time slot; the satellite network control generates uplink and downlink service time slot scanning patterns according to the terminal location information and service requirements in the application, and covers wave positions 4 and 8 where satellite terminals exist on demand. When the phased array receiving beam covers the wave position where it is located, the satellite terminal sends service data, and the phased array transmission beam scans according to the downlink service time slot scanning pattern, and synchronously illuminates the corresponding wave position when sending data.

[0035] like Figure 2 As shown, the method is performed according to the following steps:

[0036] Step 1: The network management center configures the scanning pattern of the satellite-borne phased array antenna to the satellite-borne network control, which generates the uplink synchronization time slot scanning pattern and the uplink common control time slot scanning pattern, and controls the receiving beam to jump from one wave position to another, with the same dwell time on each wave position.

[0037] Step 2: The network management center configures the scanning pattern of the satellite-borne phased array antenna to the satellite-borne network control, which generates the downlink synchronization time slot scanning pattern and the downlink broadcast time slot scanning pattern, and controls the transmission beam to jump from one wave position to another, with the same dwell time on each wave position.

[0038] During the stay, the satellite network control broadcasts satellite-to-ground notifications to the current coverage wave position through the downlink broadcast time slot. The satellite-to-ground notifications include synchronization information, current public control channel resources and scanning pattern information.

[0039] Step 3: After the satellite terminal is powered on, it will monitor the transmitting beam of the onboard phased array antenna. When the transmitting beam scans to the location, the satellite terminal will capture the transmitting beam signal, perform downlink synchronization, and receive satellite-ground notifications.

[0040] Step 4: The satellite terminal sends an access request containing the satellite terminal location information to the satellite-borne network control of the satellite terminal in the uplink public control time slot according to the current public control channel resources and scanning pattern information in the satellite-ground notification.

[0041] Step 5: After receiving the access application, the satellite network control allocates receiving and transmitting service resources to the satellite terminal. Based on the satellite terminal location information and satellite terminal service requirements in the access application, it dynamically generates the scanning pattern of the service time slot and the time slot allocation plan during the residence period of each beam position, and controls the receiving and transmitting service beams to perform hopping according to the scanning pattern of the service time slot.

[0042] In this embodiment, specifically, Figure 3 As shown, Figure 3 It shows the specific time slot allocation in N frames, where the jth time slot of the i-th frame is represented by t ij The set of synchronization time slots T can be expressed as T = {t 11 ,t 21 ,t 31 ,…,t N1}, the set C of uplink common control time slots / downlink broadcast time slots can be expressed as C = {t 12 ,t 22 ,t 32 ,…,t N2}, the set of service time slots B can be expressed as B = {t 13 ,t 14 ,…,t 1M ,t 23 ,t 24 ,…,t 2M ,t N3 ,t N4 ,…,t NM In set T, the satellite network controls the phased array receiving beam to jump according to the uplink synchronization time slot scanning pattern, and the phased array transmitting beam to jump according to the downlink synchronization time slot scanning pattern; in set C, the satellite network controls the phased array receiving beam to jump according to the uplink public control time slot scanning pattern, and the phased array transmitting beam to jump according to the broadcast time slot scanning pattern; in set B, the satellite network controls the phased array receiving beam to jump according to the uplink service time slot scanning pattern, and the phased array transmitting beam to jump according to the downlink service time slot scanning pattern.

[0043] Step 6: The satellite network control sends a beam through the satellite phased array antenna to send the service time slot resources allocated to the satellite terminal to the satellite terminal.

[0044] Step 7: The satellite terminal calculates the time to send the service data according to the time slot allocation plan, and sends the service data at this time to achieve service communication.

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

[0046] Step nine: After receiving the access completion, the satellite network control reclaims 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 period of each wave position, and controls the phased array receiving beam and transmitting beam to jump wave position by wave position according to the new scanning pattern.

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

[0048] Further preferably, the uplink synchronization time slot is used by the satellite terminal in a shared manner, the uplink public control time slot is used by the satellite terminal in a competitive manner, and the uplink service time slot is managed according to one scheduling cycle and allocated for use by the satellite terminal through onboard network control.

[0049] Further preferably, the downlink synchronization time slot and the downlink broadcast time slot are used by the satellite terminal in a shared manner, and the downlink service time slot is managed according to one scheduling cycle and allocated for use by the satellite terminal through onboard network control.

[0050] As a preferred solution of this embodiment, the wave position is an area where the phased array receiving beam and transmitting beam are projected on the surface; the scanning pattern is composed of a wave position sequence and a dwell time, and the receiving beam and transmitting beam of the satellite-borne phased array antenna jump between different wave positions in the order given by the wave position sequence.

[0051] Further preferably, the satellite-borne network control can generate a variety of scanning patterns according to the time slot type, and in different time slots, the receiving beam and transmitting beam of the satellite-borne phased array antenna only jump according to the scanning pattern corresponding to the current time slot.

[0052] Specifically, in this embodiment, Figure 4 As shown, Figure 4 The figure shows the operation flow chart of the satellite phased array beam scanning application method. First, the network management center configures the antenna scanning pattern to the satellite network control. The satellite network control generates uplink synchronization, uplink control, downlink synchronization, and downlink broadcast scanning patterns according to the configured scanning patterns, and sends beam pointing control instructions according to the wave position scanning pattern. The satellite terminal receives the satellite-ground announcement in the broadcast time slot, and sends an access application containing the terminal location information to the satellite network control of the satellite through the uplink public control time slot according to the public control channel resources and scanning pattern information in the announcement. After receiving the access application, the satellite network control executes the access control process according to the user type, priority, and resource requirements. If the satellite terminal meets the access conditions, it allocates time and frequency resources to it, updates the uplink and downlink service scanning patterns, and sends beam pointing control instructions.

Claims

1. A satellite phased array beam scanning application method, characterized in that: The method proceeds as follows: Step 1: The network management center configures the scanning pattern of the satellite-borne phased array antenna to the satellite-borne network control, and 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 dwell time on each wave position is the same; Step 2: The network management center configures the scanning pattern of the satellite-borne phased array antenna to the satellite-borne network control, and the satellite-borne network control generates the downlink synchronization time slot scanning pattern and the downlink broadcast time slot scanning pattern, and controls the transmission beam to perform wave position hopping, and the dwell time on each wave position is the same; During the stay period, the satellite network control broadcasts the satellite-to-ground notification to the current coverage wave position through the downlink broadcast time slot. The satellite-to-ground notification includes synchronization information, current public control channel resources and scanning pattern information; Step 3: After the satellite terminal is powered on, it stands guard at the transmitting beam of the onboard phased array antenna. When the transmitting beam scans to the location, the satellite terminal captures the transmitting beam signal, performs downlink synchronization, and receives satellite-to-ground notifications. Step 4: The satellite terminal sends an access request including the location information of the satellite terminal to the satellite-borne network control of the satellite terminal in the uplink public control time slot according to the current public control channel resources and scanning pattern information in the satellite-ground notification; Step 5: After receiving the access application, the satellite network control allocates receiving service resources and 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 period of each beam position in combination with the satellite terminal location information and the satellite terminal service requirements in the access application, and controls the receiving service beam and the transmitting service beam to perform hopping according to the scanning pattern of the service time slot; Step 6: The satellite network control sends a beam through the satellite 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 time to send the service data according to the time slot allocation plan, and sends the service data at this time to achieve service communication; Step 8: After the service communication is completed, the satellite terminal sends an access completion message to the onboard network control; Step nine: After receiving the access completion, the satellite network control reclaims 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 period of each wave position, and controls the phased array receiving beam and transmitting beam to jump wave position by wave position according to the new scanning pattern.

2. The satellite phased array beam scanning application method according to claim 1, characterized in that: The phased array receiving beam and transmitting beam 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 receiving beam is divided into 1 uplink synchronization time slot, 1 uplink public control time slot and M-2 uplink service time slots in one scheduling period; the phased array transmitting beam is divided into 1 downlink synchronization time slot, 1 broadcast time slot and M-2 downlink service time slots in one scheduling period.

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

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

5. The satellite phased array beam scanning application method according to claim 1, characterized in that: The beam position is an area where the phased array receiving beam and transmitting beam are projected on the surface; the scanning pattern consists of a beam position sequence and a dwell time, and the receiving beam and transmitting beam of the satellite-borne phased array antenna jump between different beam positions in the order given by the beam position sequence.

6. The satellite phased array beam scanning application method according to claim 5, characterized in that: The satellite-borne network control can generate a variety of scanning patterns according to the time slot type. In different time slots, the receiving beam and transmitting beam of the satellite-borne phased array antenna only jump according to the scanning pattern corresponding to the current time slot.

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