CN117408556A - Distributed low-orbit satellite operation situation and service capability assessment method - Google Patents
Distributed low-orbit satellite operation situation and service capability assessment method Download PDFInfo
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Abstract
The invention discloses a distributed low-orbit satellite operation situation and service capability assessment method, which comprises ephemeris automatic loading, satellite situation prediction, prediction data distribution, satellite service capability monitoring assessment and satellite service capability assessment display. The invention realizes the functions of automatically updating and displaying satellite situation based on the map, generating satellite situation prediction data based on the region, distributing the satellite situation prediction data, evaluating satellite service capability based on the site and the like. The method has the advantages of high real-time performance, high automation, high stability, high performance and expandable high satellite service capability assessment. The method is particularly suitable for the requirements of low-orbit satellite monitoring, satellite tracking prediction, optimal use position site selection of monitoring stations and the like in the field of radio monitoring, and has stronger popularization and application values.
Description
Technical Field
The invention belongs to a low orbit satellite service capability assessment technology in the field of wireless signal communication, has a service capability assessment function for a target area transit satellite, is beneficial to improving the comprehensive grasp of the signal capability of a non-stationary orbit satellite transit and a service terminal in China, timely discovers the operation rule and the signal service capability, and has very important significance in improving the site selection of a signal monitoring station and the selection of a satellite terminal using region in China.
Background
The satellite of the low-orbit satellite communication system has small volume, light weight, low cost, short period and mass production; the satellites are mutually backed up, so that the loss is small; the ground terminal equipment is simple, low in cost and convenient to carry; because the track height is low, high-speed internet access service can be provided; can cover two polar regions and truly realize global coverage. Satellite internet generally adopts a low orbit constellation mode to provide internet access service for users.
The number of low orbit constellation satellites is huge, and the relative positions of the satellites and the ground are rapidly changed when the satellites are always in high-speed motion relative to the earth. In order to determine the motion trail of each node (satellite) in the constellation and the change condition of the position relation with the ground along with time, the constellation is effectively evaluated for service capability, monitoring and evaluating stations are required to be established in all places to evaluate the satellite service capability, and under the same time reference, the generation and distribution of the constellation situation unified by the whole network and the evaluation of the constellation service capability are necessary. The satellite situation is composed of a specific position of each satellite at a certain moment in a constellation, situation data of each satellite comprises satellite names, satellite identifications, time, longitude and latitude, altitude and the like, and as the number of low-orbit internet constellation satellites is huge (2-4 ten thousand), the situation prediction time precision is high (0.1 second), the data size is large, and how to coordinate each monitoring station to monitor a certain constellation at the same time so as to accurately evaluate the communication capability of the certain constellation in the national range faces challenges.
At present, research of inside and outside scholars in China in the public literature is mainly focused on satellite situation and satellite coverage research, the satellite regional service capability assessment function is not provided, and the research content is single. The method for evaluating the low orbit satellite operation situation and the satellite service capability by integrating relevant realization technologies such as constellation situation distribution, regional satellite service capability evaluation and the like of the distributed networking is not seen yet.
Disclosure of Invention
The invention aims to provide a distributed low-orbit satellite operation situation and service capability assessment method which has the characteristics of strong automation, high concurrency, high speed and the like.
In order to achieve the technical aim, the invention adopts the following technical scheme:
a distributed low-orbit satellite operation situation and service capability evaluation method comprises the following steps:
step 1, a central station acquires ephemeris data according to a plurality of backup redundant addresses, selects the latest ephemeris data to generate satellite situation data, and distributes the satellite situation data to each monitoring station;
step 2, each monitoring station receives corresponding satellite situation data, adjusts the monitoring antenna to aim at the target satellite according to the position of the target satellite and the position of the monitoring antenna, monitors the frequency band of the target satellite to obtain an evaluation index, and transmits the evaluation index to the central station;
and step 3, the central station gathers the evaluation index data of each monitoring station, performs real-time display, comprehensively analyzes and processes the indexes of each monitoring station, generates the communication service capability indexes, and displays the communication service capability indexes.
Further, the step 1 specifically includes the following steps:
step 101, a central station acquires ephemeris data according to a plurality of backup redundant addresses, calculates position data of all satellites at all moments in a future set time based on the latest ephemeris data, and generates a satellite situation prediction list;
step 102, screening a satellite situation prediction list according to an evaluation area to generate satellite situation data in the evaluation area;
step 103, screening satellite situation data in an evaluation area according to the monitoring evaluation range of each monitoring station to obtain satellite situation data of a certain monitoring station;
and 104, packaging satellite situation data of the monitoring stations according to set time intervals, and distributing the data packets serving as subject data to the corresponding monitoring stations.
Further, the step 2 specifically includes the following steps:
step 201, each monitoring station acquires satellite situation data in a set time period according to monitoring evaluation task parameters, caches the satellite situation data, and generates a monitoring sequence according to the transit time and azimuth pitch angle of the satellite;
step 202, in the monitoring process, obtaining the position of a target satellite at the current moment from a local cache according to the time beat, and combining the position of a monitoring antenna, calculating the azimuth pitch angle of the monitoring antenna relative to the target satellite, and adjusting the alignment of the monitoring antenna to the target satellite;
step 203, invoking monitoring equipment to monitor the frequency band of the target satellite, obtaining an evaluation index according to the result data obtained by monitoring, and transmitting the evaluation index to a central station; the evaluation indexes comprise evaluation sites, evaluation time, frequency, bandwidth, signal to noise ratio, theoretical channel capacity, satellite elevation angle, azimuth angle, satellite longitude, satellite latitude and satellite altitude.
Compared with the background technology, the invention has the beneficial effects that:
1. the invention realizes the real-time monitoring and evaluation of the whole network combined by a plurality of stations, and has the characteristics of strong constellation pertinence and wide coverage area;
2. the invention divides the tasks according to regions, so that each station can execute the monitoring and evaluating tasks in parallel, and the invention has higher efficiency;
3. the invention realizes the unified calculation and distribution of satellite situation in the center, can eliminate the error of monitoring and evaluation of each station, and has higher accuracy;
4. the central station transmits situation data, each monitoring station automatically executes monitoring and reports the data, and the system has the characteristic of unattended operation and has better automaticity.
5. The central station manages all the monitoring evaluation index data, can form a monitoring evaluation index historical database, is convenient for analyzing and evaluating big data, and discovers rules and information.
6. The invention has expansibility, supports the expansion construction of a plurality of evaluation sites, and realizes better monitoring density;
7. the central station can intensively adjust the system working parameters in the monitoring and evaluating process, and has stronger flexibility.
Drawings
Fig. 1 is a flow chart of the operation of the present invention.
Fig. 2 is a system architecture diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The invention discloses a distributed low-orbit satellite operation situation and service capability assessment method, which is realized based on a central station and monitoring assessment stations (monitoring stations) in each province and city. The workflow diagram is shown in fig. 1, and includes the following procedures:
step 1, a central station acquires ephemeris data according to a plurality of backup redundant addresses, selects the latest ephemeris data to generate satellite situation data, and distributes the satellite situation data to each monitoring station;
the situation data of a single satellite at a certain moment is described as follows:
(cons_name,sat_id，sat_name，time，lon，lat，alt，generate_time)
typically, to improve the temporal accuracy of the predictions, the temporal granularity (time) is typically 1 second. The amount of satellite situation data produced in one second is 30000 pieces. Assuming that situation data needs to be distributed to 30 stations, each data is calculated according to 128 bytes, the requirement of the outlet network bandwidth of the center is 30000 (entry) ×30 (station) ×128 (byte) ×8 (bit) =880M bandwidth, and the requirement of national networking is obviously difficult to realize.
In order to achieve the purpose of distributing constellation situation data to each station through a network, the situation data generation and distribution process is optimized by combining an evaluation area, evaluation station positions and evaluation station numbers. Meanwhile, the central station distributes satellite situation data to each station, network delay exists, and certain delay exists when each station receives and processes the satellite situation data, so that the center needs to forecast and send the satellite situation data to each station, and the data is transmitted to each monitoring station in advance.
The specific process is described as follows:
step 101, a central station acquires ephemeris data according to a plurality of backup redundant addresses, calculates position data of all satellites at all moments in a future set time (set to 3 minutes in the embodiment) based on the latest ephemeris data, and generates a satellite situation prediction list;
step 102, screening a satellite situation prediction list according to an evaluation area to generate satellite situation data in the evaluation area;
step 103, screening satellite situation data in an evaluation area according to the monitoring evaluation range of each monitoring station to obtain satellite situation data of a certain monitoring station;
step 104, the satellite situation data of the monitoring stations are packaged according to a set time interval (the interval is adjustable, and 30 seconds are set in the embodiment), and the data packets are used as subject data to be distributed to the corresponding monitoring stations.
According to the steps, through measurement and calculation, the outlet bandwidth requirement of the central station can be reduced to be within 7M, so that the requirement of the central station for distributing satellite situations to all monitoring stations in real time is met. The central station distributes satellite situation data to each monitoring station, network delay exists, and certain delay exists when each monitoring station receives and processes the satellite situation data, so that the satellite situation data sent to each monitoring station by the central station cannot meet the requirements of real-time monitoring and evaluation. The central station continuously broadcasts forecast satellite situation data to each monitoring station, each monitoring station receives the forecast data and then caches the forecast data to local for standby, and the real-time requirement of each station for acquiring the satellite situation data at any time in the future can be met.
Step 2, each monitoring station receives corresponding satellite situation data, adjusts the monitoring antenna to aim at the target satellite according to the position of the target satellite and the position of the monitoring antenna, monitors the frequency band of the target satellite to obtain an evaluation index, and transmits the evaluation index to the central station;
the time system of each monitoring station adopts standard Beidou time and realizes synchronization of the whole network time.
The evaluation process of each monitoring site is as follows:
step 201, each monitoring station acquires satellite situation data in a set time period according to monitoring evaluation task parameters, caches the satellite situation data, and generates a monitoring sequence according to the transit time and azimuth pitch angle of the satellite;
step 202, in the monitoring process, obtaining the position of a target satellite at the current moment from a local cache according to the time beat, and combining the position of a monitoring antenna, calculating the azimuth pitch angle of the monitoring antenna relative to the target satellite, and adjusting the alignment of the monitoring antenna to the target satellite;
step 203, invoking monitoring equipment to monitor the frequency band of the target satellite, obtaining an evaluation index according to the result data such as the frequency, the bandwidth, the signal to noise ratio and the like obtained by monitoring, and transmitting the evaluation index to a central station; the evaluation indexes comprise evaluation sites, evaluation time, frequency, bandwidth, signal to noise ratio, theoretical channel capacity, satellite elevation angle, azimuth angle, satellite longitude, satellite latitude, satellite altitude and the like.
And step 3, the central station gathers the evaluation index data of each monitoring station, performs real-time display, comprehensively analyzes and processes the indexes of each monitoring station, generates the communication service capability indexes, and displays the communication service capability indexes.
The satellite service capability shows that the earth is divided into hexagonal grids with the radius of 22Km according to an H3 algorithm, the earth is divided into 288122 hexagons, grid coverage with the radius of 100Km (configurable) range near a designated position is displayed, whether each grid is covered by a satellite is judged according to whether the pitching of a connecting line of the satellite and a central point of the hexagons is greater than or equal to 30 degrees, and satellites in the hexagonal area are not covered at the angle of less than 30 degrees. According to the situation of calculating the current site transit satellite, the grid coverage situation can be drawn in real time, the grid color is better, the grid color is more green, the grid coverage is worse, and the terminal communication capability is worse.
The invention can calculate the position of the satellite (including the longitude, latitude, altitude and other information of the satellite) according to the satellite ephemeris data in the background, automatically calculate the position information for a period of time in the background and store the position information as a file format, realize the satellite animation effect by loading the satellite position file on the map, and can fast forward and display the satellite running condition, and display the satellite running track and satellite coverage range. And the system draws the coverage of the satellite according to satellite parameter configuration. The map supports two-dimensional and three-dimensional display, and the running track of the satellite can be displayed by clicking a certain satellite icon.
It should be understood that the foregoing description of the embodiments of the present invention is merely illustrative for the purpose of facilitating the understanding of the present invention by those skilled in the art, and is not intended to limit the scope of the present invention to only these examples, and that those skilled in the art may fully realize that many more embodiments are possible without any inventive effort, by combining technical features, substituting parts of technical features, adding more technical features, etc. for each of the examples listed in the present invention, all of which are within the scope of the claims of the present invention, and therefore, these new embodiments should also fall within the scope of the present invention.
Claims (3)
1. The method for evaluating the running situation and the service capability of the distributed low-orbit satellite is characterized by comprising the following steps of:
step 1, a central station acquires ephemeris data according to a plurality of backup redundant addresses, selects the latest ephemeris data to generate satellite situation data, and distributes the satellite situation data to each monitoring station;
step 2, each monitoring station receives corresponding satellite situation data, adjusts the monitoring antenna to aim at the target satellite according to the position of the target satellite and the position of the monitoring antenna, monitors the frequency band of the target satellite to obtain an evaluation index, and transmits the evaluation index to the central station;
and step 3, the central station gathers the evaluation index data of each monitoring station, performs real-time display, comprehensively analyzes and processes the indexes of each monitoring station, generates the communication service capability indexes, and displays the communication service capability indexes.
2. The method for evaluating the running situation and service capability of a distributed low-orbit satellite according to claim 1, wherein the step 1 specifically comprises the following steps:
step 101, a central station acquires ephemeris data according to a plurality of backup redundant addresses, calculates position data of all satellites at all moments in a future set time based on the latest ephemeris data, and generates a satellite situation prediction list;
step 102, screening a satellite situation prediction list according to an evaluation area to generate satellite situation data in the evaluation area;
step 103, screening satellite situation data in an evaluation area according to the monitoring evaluation range of each monitoring station to obtain satellite situation data of a certain monitoring station;
and 104, packaging satellite situation data of the monitoring stations according to set time intervals, and distributing the data packets serving as subject data to the corresponding monitoring stations.
3. The method for evaluating the running situation and service capability of a distributed low-orbit satellite according to claim 1, wherein the step 2 comprises the following steps:
step 201, each monitoring station acquires satellite situation data in a set time period according to monitoring evaluation task parameters, caches the satellite situation data, and generates a monitoring sequence according to the transit time and azimuth pitch angle of the satellite;
step 202, in the monitoring process, obtaining the position of a target satellite at the current moment from a local cache according to the time beat, and combining the position of a monitoring antenna, calculating the azimuth pitch angle of the monitoring antenna relative to the target satellite, and adjusting the alignment of the monitoring antenna to the target satellite;
step 203, invoking monitoring equipment to monitor the frequency band of the target satellite, obtaining an evaluation index according to the result data obtained by monitoring, and transmitting the evaluation index to a central station; the evaluation indexes comprise evaluation sites, evaluation time, frequency, bandwidth, signal to noise ratio, theoretical channel capacity, satellite elevation angle, azimuth angle, satellite longitude, satellite latitude and satellite altitude.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117973816A (en) * | 2024-04-01 | 2024-05-03 | 贵州师范大学 | Observation planning system and method based on antenna array |
| CN118018103A (en) * | 2024-04-09 | 2024-05-10 | 北京有生志广科技有限公司 | Method for guiding and monitoring position by ephemeris, satellite monitoring control equipment and satellite monitoring control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117973816A (en) * | 2024-04-01 | 2024-05-03 | 贵州师范大学 | Observation planning system and method based on antenna array |
| CN118018103A (en) * | 2024-04-09 | 2024-05-10 | 北京有生志广科技有限公司 | Method for guiding and monitoring position by ephemeris, satellite monitoring control equipment and satellite monitoring control system |
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