Low earth orbit satellite-to-ground link payload device

Abstract

The application discloses a low-orbit satellite-ground link load device and relates to the field of satellite communication signal processing. The device comprises a load monitoring module, a service information processing module, a frequency conversion and amplification module and a phased array antenna module. The load monitoring module is used for analyzing task planning sets and control instruction information on the ground, and is responsible for autonomous adjustment and switching of working frequency points and beam pointing control; the service information processing module supports network access management and service communication of user terminals, and reports the positions of the network access terminals to the load monitoring module; the frequency conversion and amplification module completes frequency conversion and amplification of intermediate frequency signals and radio frequency signals, and analyzes frequency point configuration instructions of the load monitoring module; and the phased array antenna module completes beam pointing according to transmission beam pointing parameters issued by the service information processing module, and completes the transmission and reception of wireless signals. The application can autonomously adjust the working frequency band according to the avoidance principle planned by the ground, and realizes normal communication in the process of eliminating interference on other systems.

Description

Technical Field

[0001] This invention relates to the field of satellite communication signal processing, and in particular to a low-Earth orbit satellite-to-ground link payload device. Background Technology

[0002] In recent years, with the rapid development of low-Earth orbit satellite internet systems, frequency avoidance for other satellite constellations has become a research hotspot in the field of satellite communications. Due to the advantages of the Ka band, such as its large bandwidth and high antenna gain, communication satellites typically use Ka band payloads to establish satellite-to-ground links. However, due to the scarcity of Ka frequency resources, frequency interference may occur between satellites of different constellations. Therefore, frequency avoidance for existing satellites needs to be considered. Currently, common methods to avoid this interference include: 1) Reasonable frequency planning, using different operating frequencies for different satellites; however, this method has low versatility due to limitations in ITU standards and frequency band resources; 2) Frequency reuse, using frequency reuse technology for different satellites; shutting down satellites when mutual interference occurs to ensure high-priority tasks are protected; this method requires continuous negotiation between different satellite operators, resulting in high communication costs; 3) Power control, controlling the satellite's transmission power to achieve optimal signal reception at ground receiving stations, reducing the possibility of interference; this method reduces link transmission capacity and satellite-to-ground efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and propose a low-Earth orbit satellite-to-ground link payload device. This invention is simple to implement, suitable for autonomous operation of constellation satellites, can support adaptive frequency avoidance adjustment of the link, and is compatible with various satellite platforms and application scenarios that avoid different frequency points in different regions.

[0004] This invention is implemented as follows:

[0005] A low-orbit satellite-to-ground link payload device includes a payload monitoring module 1, a service information processing module 2, a frequency conversion amplifier module 3, and a phased array antenna module 4.

[0006] The payload monitoring module 1 analyzes the task planning set and control command information uploaded by the ground control center in real time for resource status management of the satellite-to-ground link, and stores the avoidance principles uploaded by the ground control center. The payload monitoring module 1 determines whether to initiate avoidance operation based on the local satellite service area and satellite-to-ground link working status parameters reported by the business information processing module 2. If it needs to be initiated, the working frequency point is selected, the frequency point adjustment command of the frequency conversion amplifier module 3 is configured through the high-speed LVDS interface, and the angle pointing parameter value of the phased array antenna module 4 is configured.

[0007] The business information processing module 2 supports the network access management and business communication transmission services of user terminals, and periodically reports the location of the network access terminal to the load monitoring module 1.

[0008] The frequency conversion amplifier module 3 performs up-conversion and signal amplification processing on the signal output by the business information processing module 2, and performs down-conversion and signal amplification processing on the radio frequency signal of the phased array antenna module 4. At the same time, it receives and parses the control information sent by the load monitoring module 1 to complete the local frequency adjustment.

[0009] The phased array antenna module 4 amplifies the signal output from the frequency conversion amplifier module 3 and transmits it wirelessly. At the same time, it amplifies the wireless received signal with low noise and outputs it to the frequency conversion amplifier module 3. In addition, it receives and parses the angle information sent by the service information processing module 2 to complete the beam pointing adjustment.

[0010] Furthermore, the frequency conversion amplifier module 3 supports frequency adjustment in 50MHz steps within the 2.5GHz bandwidth of the Ka band, and the phased array antenna module 4 supports the 2.5GHz operating bandwidth of the Ka band.

[0011] Furthermore, the load monitoring module 1 uses a 50MHz in-circuit clock and configures the frequency adjustment command of the frequency converter amplifier module 3 through a high-speed LVDS interface.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. This invention supports autonomous on-orbit operation in accordance with the avoidance principle of ground planning. The payload monitoring module simultaneously controls the switching timing of the ground user terminal and the frequency conversion amplifier module to ensure the consistency of the frequency adjustment timing of the satellite-to-ground communication.

[0014] 2. This invention transmits control command information at high speed through the LVDS interface, thereby achieving high-speed transmission of command information, effectively shortening the frequency adjustment time, and improving satellite-to-ground efficiency.

[0015] 3. This invention uses on-board autonomous region judgment and operating frequency switching. The satellite unifies the frequency switching time between user terminals and link payloads and completes the switching within the communication frame protection interval. Data is not lost or interrupted during and after the switching process.

[0016] 4. This invention employs frequency hopping technology, which allows the satellite to autonomously determine whether interference avoidance is necessary based on the frequency rules planned by the ground control center, and to autonomously coordinate frequency synchronization and switching between the satellite and the ground terminal. This has advantages in ensuring business continuity and service capabilities. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the low-orbit satellite-to-ground link payload device. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] A low-Earth orbit satellite-to-ground link payload device, such as Figure 1 As shown, it includes a load monitoring module 1, a service information processing module 2, a frequency conversion amplifier module 3, and a phased array antenna module 4.

[0020] According to the mission planning requirements, the payload monitoring module 1 is used to parse the mission planning set and control command information injected on the ground, and also for resource management such as satellite-to-ground link frequency points; it can determine interference avoidance requirements based on the avoidance positions and frequencies planned on the ground, combined with the location of the network access terminal and the operating frequency of the frequency conversion amplifier module; the service information processing module 2 supports the network access management and service communication services of user terminals, and reports the location of the network access terminal to the payload monitoring module 1; the frequency conversion amplifier module 3 completes the frequency conversion and amplification processing of intermediate frequency signals and radio frequency signals, and at the same time parses the frequency configuration commands of the payload monitoring module 1. The phased array antenna module 4 completes beam pointing and completes wireless signal transmission and reception according to the transmit beam pointing parameters issued by the service information processing module 2.

[0021] This device can autonomously adjust frequencies according to ground-planned frequency avoidance principles, with an adjustment time of less than 100µs (the frame protection duration). This ensures uninterrupted service communication and no data loss during frequency switching. The device effectively adapts to frequency avoidance requirements and usage patterns among satellites in the constellation, improving the availability and flexibility of payload equipment, as well as the efficiency of the satellite-to-ground link.

[0022] The basic working principle of this device is as follows:

[0023] The payload monitoring module 1 stores the locations and operating frequencies of areas to be avoided, as reported by the ground control center. It combines this information with the local satellite beam service area reported by the business information processing module 2 and the operating frequencies reported by the corresponding frequency conversion channel 3 to determine whether an interference zone has been entered. If an interference zone is entered, the operating frequency is adjusted. The payload monitoring module uses a high-speed LVDS interface to communicate with the frequency conversion amplifier module 3 for command issuance and health status management. It also comprehensively analyzes information such as mission planning, operating mode, satellite position, and target location, and configures the angle pointing value of the Ka phased array antenna module 4 via the LVDS interface.

[0024] The business information processing module 2 performs network access management and business information modulation and demodulation on the ground user terminals, and periodically reports the location of the user terminals served by this satellite to the payload monitoring module 1.

[0025] The frequency conversion amplifier module 3 up-converts and amplifies the signal output from the service information processing module 2, and down-converts and amplifies the signal output from the phased array antenna module 4. Simultaneously, it receives and parses the operation control information sent by the load monitoring module 1 to complete the local oscillator frequency adjustment. The frequency conversion amplifier module 3 supports 50MHz step adjustments within a 2.5GHz bandwidth.

[0026] The phased array antenna module 4 amplifies the signal packets output by the frequency conversion amplifier module 3 and transmits them wirelessly; at the same time, it amplifies the wireless received signal with low noise and outputs it to the frequency conversion amplifier module 3; in addition, it receives and parses the angle information sent by the service information processing module to complete the pointing adjustment; the phased array antenna supports a 2.5GHz operating bandwidth.

[0027] The load monitoring module of this invention stores avoidance criteria and autonomously determines whether to perform interference avoidance operations based on parameters such as satellite position and satellite operating status. The load monitoring module autonomously decides which channels require avoidance adjustment and the adjusted operating frequency based on the operating frequency band and bandwidth usage of each channel of the frequency converter amplifier module, and notifies the user terminal and the frequency converter channel module of the adjusted frequency for frequency switching. The load monitoring module and the frequency converter amplifier module use an LVDS interface for command transmission, employing a 50MHz on-path clock, enabling frequency command transmission to be completed in nanoseconds. The frequency converter amplifier module minimizes phase noise and reference spurious design and employs a high-performance oscillator (LO) to relock the operating frequency within tens of microseconds; therefore, the entire frequency adjustment completion time is less than 100µs.

[0028] This invention can eliminate frequency interference to other constellation systems, supports 50MHz step adjustments within the 2.5GHz bandwidth of the Ka band, and ensures frequency switching is completed within each communication frame guard interval without affecting normal transmission delay jitter and transmission efficiency. This invention can autonomously adjust its operating frequency band according to the avoidance principles of ground planning, ensuring uninterrupted service communication and no data loss during the elimination of interference to other systems.

Claims

1. A low-Earth orbit satellite-to-ground link payload device, characterized in that, It includes a load monitoring module (1), a business information processing module (2), a frequency conversion amplifier module (3), and a phased array antenna module (4). The payload monitoring module (1) analyzes the task planning set and control command information uploaded by the ground control center in real time for the resource status management of the satellite-to-ground link, and stores the avoidance principles uploaded by the ground control center; the payload monitoring module (1) determines whether to start avoidance operation based on the local satellite service area and satellite-to-ground link working status parameters reported by the business information processing module (2). If it needs to be started, the working frequency point is selected, the frequency point adjustment command of the frequency conversion amplifier module (3) is configured through the high-speed LVDS interface, and the angle pointing parameter value of the phased array antenna module (4) is configured; the payload monitoring module controls the switching timing of the ground user terminal and the frequency conversion amplifier module to ensure the consistency of the frequency point adjustment timing of satellite-to-ground communication. The business information processing module (2) supports the network access management and business communication transmission services of user terminals, and periodically reports the location of the network access terminal to the load monitoring module (1). The frequency conversion amplification module (3) performs up-conversion and signal amplification processing on the signal output by the business information processing module (2), and performs down-conversion and signal amplification processing on the radio frequency signal of the phased array antenna module (4). At the same time, it receives and parses the control information sent by the load monitoring module (1) to complete the local frequency adjustment. The phased array antenna module (4) amplifies the signal output by the frequency conversion amplifier module (3) and transmits it wirelessly. At the same time, it amplifies the wireless received signal with low noise and outputs it to the frequency conversion amplifier module (3). In addition, it receives and parses the angle information sent by the service information processing module (2) to complete the beam pointing adjustment.

2. The low-Earth orbit satellite-to-ground link payload device according to claim 1, characterized in that, The frequency conversion amplifier module (3) supports frequency adjustment in 50MHz steps within the 2.5GHz bandwidth of the Ka band, and the phased array antenna module (4) supports the 2.5GHz working bandwidth of the Ka band.

3. A low-Earth orbit satellite-to-ground link payload device according to claim 1, characterized in that, The load monitoring module (1) uses a 50MHz on-path clock and configures the frequency adjustment command of the frequency converter module (3) through the high-speed LVDS interface.

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