CN103795455B - User comprehensive weighting access method suitable for satellite data acquisition system - Google Patents
User comprehensive weighting access method suitable for satellite data acquisition system Download PDFInfo
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- CN103795455B CN103795455B CN201410015630.6A CN201410015630A CN103795455B CN 103795455 B CN103795455 B CN 103795455B CN 201410015630 A CN201410015630 A CN 201410015630A CN 103795455 B CN103795455 B CN 103795455B
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Abstract
The invention discloses a user comprehensive weighting access method suitable for a satellite data acquisition system. The method comprises the following steps: A. for general data services, when a plurality of satellites cover a data acquisition platform (DCP), the DCP weights three factors of the number of idle channels of access satellites, satellite coverage time and elevation angle to form a weighted target access function, selects the optimal satellite access to ensure that the system switching cost is low and the switching failure rate is low in the access process, avoids channel deterioration and avoids overload of part of satellites calling frequently; B. and for the emergency data service, adjusting the weighting coefficient of the weighted target access function, and selecting a proper satellite for access. If the access satellite has no idle channel, the transmission of the current general service is suspended, and the channel is seized. The method can effectively solve the problem that when the DCP is covered by a plurality of satellites in a satellite data acquisition system, the DCP selects the satellite for access, the success rate of the DCP for accessing the satellite is improved, and the throughput of the system is improved.
Description
Technical Field
The present invention relates to the field of satellite communications. Satellite communication can provide global coverage broadband mobile services, and in a satellite data acquisition system, when a plurality of satellites cover a data acquisition platform (DCP), the selection of the best satellite for access is an important factor for guaranteeing the communication quality. Under the condition of a multi-satellite coverage data acquisition platform (DCP), an access satellite can be effectively selected through a weighted target access function, the access success rate is improved, and the throughput of the system is improved.
Background
The system for collecting a large number of information sources on the ground and on the sea by using the satellite is a satellite data acquisition system, consists of a measurement terminal, a forwarding satellite and a satellite operation control center, is suitable for acquiring and summarizing data with wide distribution range, slowly-varying parameters and low transmission rate, and has the outstanding advantage that relevant information in a satellite coverage range can be quickly and conveniently acquired by establishing an unattended data acquisition platform (DCP). Today, international DCS systems are divided into two categories: the geostationary orbit (GEO) meteorological satellite DCS system (GEO DCS) and the low earth orbit DCS system (LEO DCS). In order to avoid the problems that the communication distance of a high-orbit satellite is long, the path loss is caused, and the DCP antenna is too large and is not beneficial to miniaturization, the patent provides a weight access algorithm for a low-orbit satellite DCS system so as to solve the problems that in the low-orbit satellite DCS system, the number of satellites is large, and when a plurality of satellites cover the same data acquisition platform at the same time, the data acquisition platform selects the satellites to access.
When a data acquisition platform (DCP) communicates with multiple LEO satellites covering a ground station, only a single satellite needs to be accessed. Although the number of satellites can theoretically satisfy the requirement, the coverage of the satellites is not uniformly distributed in consideration of the difference of the distribution density of users, that is, the situation that a plurality of satellites cover the same DCP may occur. If the DCP adopts a random access algorithm at this time, the access success rate is reduced, thereby reducing the throughput of the system and causing the reduction of data transmission quality. At the moment, if a certain access control algorithm is selected, the success probability of access can be effectively ensured. If the design of the access algorithm is performed according to one of the factors of the satellite coverage time, the number of idle channels of the satellite, the elevation factor and the like, there is a certain limitation, for example, if the satellite with the longest service time is selected for access according to the satellite coverage time factor, the access satellite is far away from the DCP, a larger time delay is caused, channel deterioration caused by low elevation cannot be avoided, and the access satellite is overloaded and is not favorable for load balancing; if the satellite with the shortest transmission distance is selected for access according to the elevation factor, the service time of the satellite is possibly discontinuous, the system switching cost is increased, the problem of high switching failure rate is caused, and the problem of heavy satellite load cannot be avoided. Therefore, the method comprehensively considers a plurality of factors, and adopts a weighting strategy to design a widely applicable and flexible access algorithm, which is an optimal method for effectively solving various problems.
Disclosure of Invention
According to the characteristics of satellite communication, a comprehensive weighting satellite access strategy based on a shortest distance strategy, a longest service time strategy and a load balancing strategy is provided. The shortest distance strategy mainly considers the elevation factor, the longest service time strategy mainly considers the satellite coverage time factor, and the load balancing strategy mainly considers the access satellite idle channel factor. And performing weighting calculation on the parameters related to the three strategies to form a weighting objective function, selecting, calculating and determining weighting coefficients of the three parameters according to actual conditions, and designing an access method suitable for different conditions. The method comprises the steps that under the condition of different services, the weight coefficient of a weighted target access function is changed, the influence proportion of three factors, namely the number of idle satellite channels, the satellite coverage time and the elevation angle, on the weighted target access function is adjusted, and an applicable access method is formed; under the condition of emergency data service, due to the emergency characteristic of data transmission, the transmission channel of the general data service currently being transmitted can be preempted under the condition of no idle channel, and two factors of the coverage time and the transmission distance of the weighting satellite are further synthesized to form a weighted target access method, and the optimal satellite is selected for access. The patent proposes that a satellite coverage area is divided into a plurality of cellular networks, DCPs are uniformly distributed at nodes of the cellular networks, and the satellite coverage area is determined firstly; secondly, the radius of the cellular network is determined according to the DCP number, the DCPs are uniformly distributed on nodes of the cellular network, and the distribution condition of the DCPs in the satellite coverage area is determined according to the mapping relation between the DCP number on the radius and the DCP number in the coverage area.
Drawings
FIG. 1 is a schematic diagram of a data user integrated weighted access method
FIG. 2 data acquisition platform Access flow diagram
Fig. 3 shows access policy diagrams under different weight coefficients
FIG. 4 satellite coverage area cellular network partitioning method
In fig. 4:
1 denotes satellite coverage;
2 denotes the satellite coverage radius;
3 denotes the divided cellular network;
and 4, a ground data acquisition platform.
Detailed Description
In a data acquisition system, under the condition that a plurality of satellites cover a data acquisition platform, the data acquisition platform needs to select an optimal satellite for access through a certain access algorithm so as to ensure the probability of successful access, improve the throughput of the system and ensure higher transmission quality. In the longest service time access strategy, because a satellite with the longest service time needs to be accessed preferentially, the probability that the elevation angle of the satellite tends to be low is increased relative to the shortest distance access strategy; in contrast, in the shortest distance access policy, since a satellite having a shorter transmission distance is preferentially accessed, the probability that the satellite coverage time becomes shorter increases compared to the longest service time access policy. Therefore, on the basis of ensuring that the satellite has an idle channel, a comprehensive weighting strategy needs to be designed, so that the advantages of low system switching overhead and low switching failure rate of the longest service time strategy are reserved, channel deterioration caused by a lower elevation angle is avoided, communication traffic in the space tends to be balanced as much as possible, and overload of a part of the satellite with frequent calling is avoided.
Aiming at data transmission of general services, on the basis of ensuring that a satellite covering a DCP has idle channels, carrying out weighted calculation on three factors of the number of the idle channels of the satellite, the satellite covering time and the elevation angle, selecting the satellite with a large number of the idle channels, balancing network load and avoiding overload of part of the satellite with frequent calling; selecting a satellite with longer satellite coverage time, ensuring the longest service time, reducing the switching times to the maximum extent, reducing the system overhead caused by switching and obtaining a lower switching failure rate; and a satellite with a larger elevation angle, namely a satellite with a shorter transmission distance is selected, so that channel deterioration caused by a lower elevation angle is avoided. In the patent, the coverage time and the number of idle channels are linearly weighted, and the satellite elevation angle is nonlinearly weighted due to the nonlinear relation among the channel attenuation loss, the shielding effect and the elevation angle, so that the satellite channel is prevented from being seriously deteriorated when the elevation angle is the minimum elevation angle.
Aiming at the emergency data service, if the satellite covering the DCP has an idle channel, carrying out comprehensive weighted access according to the access strategy of the general service condition; if no idle channel exists in the satellite covering the DCP, suspending the general service in the satellite covering the DCP at present, seizing the general service channel, ensuring the transmission of the emergency data service, then carrying out weighted calculation on three factors of the satellite covering time and the transmission distance, forming an applicable access method, and selecting the best satellite to be added.
Fig. 1 is a schematic diagram of a data user integrated weighted access method. When a plurality of satellites cover the terminal DCP, judging whether idle channels exist in the plurality of satellites covering the DCP, and if the idle channels exist, implementing a target weighted access method for integrating three factors of the number of the idle channels, the satellite coverage time and the elevation angle; if no idle channel exists and the type of the data service is a general service, the DCP enters a queuing waiting state; if no idle channel exists and the type of the data service is an emergency service, suspending the data transmission service of the current satellite, seizing the channel of the general service, comprehensively weighting the satellite coverage time and the elevation angle factor, forming an applicable access method, and selecting the optimal satellite for access.
The data acquisition platform DCP access flow diagram is shown in fig. 2. When a new call request exists, calling the mobile terminal to enter a service list, and selecting a satellite according to the comprehensive consideration of the coverage time, the transmission distance strategy and the load balance; then, selecting a channel according to the access scheme, and if the access is successful, occupying the channel to transmit data; if so, clearing the service list item and requesting again after a certain time interval.
We set the weighted objective function formula for multi-satellite DCP as follows:
wherein λ1、λ2、λ3The weighting coefficients of the idle channel, the satellite coverage time and the elevation angle respectively represent a channel state factor, a service time factor and a distance factor when information is accessed.
cfreeFor the current number of free channels of a single satellite, callThe total number of channels for a single satellite. T isoverFor satellite coverage time, TmIs the maximum satellite coverage time of the system, theta is the current elevation angle, thetamIs the minimum elevation angle.
Different lambda values are selected to determine different access strategies. The access policies under different weight coefficients are shown in fig. 3. The value of different weight coefficients is 0 or 1, if the factor is not considered, the weight coefficient is zero, and if the factor is considered, the weight coefficient is 1. Setting weight coefficients of different factors according to actual requirements, and designing access methods suitable for different conditions.
Considering the time factor of the satellite coverage DCP, the coverage area of the satellite is divided into cell shapes, and the satellite coverage area division diagram is shown in fig. 4. Firstly, the coverage area of a satellite is determined, the number of cellular networks needing to be divided is determined according to the number of DCPs in the coverage area of the satellite, the DCPs in the coverage area are uniformly distributed on nodes of the divided cells, so that the number of the DCPs in each radius is calculated, and the distribution condition of the DCPs in the coverage area of the satellite is determined through the mapping relation between the number of the DCPs in the radius and the number of the DCPs in the coverage area in consideration of the moving characteristics of the satellite.
Claims (1)
1. A user comprehensive weighting access method suitable for a satellite data acquisition system is characterized in that: the method comprises
A. Comprehensively considering three reference factors of a satellite idle channel, satellite coverage time and elevation angle;
B. performing weighted calculation on the three parameters to form a weighted target access function;
C. selecting, calculating and determining the weighting coefficients of the three parameters, and setting a weighting objective function formula when the DCP is covered by multiple stars as follows
Wherein λ1、λ2、λ3Respectively idle channel weighting coefficient, satellite coverage time weighting coefficient, elevation angle weighting coefficient, CfreeFor the current number of free channels of a single satellite, CallFor the total number of channels, T, of a single satelliteoverFor satellite coverage time, TmIs the maximum satellite coverage time of the system, theta is the current elevation angle, thetamIn order to be the minimum elevation angle,
under different service conditions, changing the weight coefficient of the weighted target access function, and adjusting the influence proportion of three factors, namely the number of idle channels of the satellite, the satellite coverage time and the elevation angle, on the weighted target access function to form an applicable access method;
D. the principle of changing the weight coefficient includes:
1) if the service type is general service, selecting satellites with a large number of idle channels from a plurality of satellites covering the DCP, and if all the satellites have no idle channels, entering a queuing waiting state to make a new call or failing to switch, and re-initiating a call which is not a new call; if the service type is emergency service, selecting a satellite with a large number of idle channels from a plurality of satellites covering the DCP, and if the plurality of satellites currently covering the DCP do not have idle channels, suspending the transmission service of the current satellite and seizing a general service channel;
2) on the basis of ensuring the idle channels, carrying out weighted calculation on the number of the idle channels, the satellite coverage time and the elevation factor, and selecting the optimal satellite for access;
E. the satellite coverage is divided into a plurality of cellular networks, the DCP or the ground users are uniformly distributed at the nodes of the cellular networks, and the dividing step comprises the following steps:
1) determining a satellite coverage range;
2) determining the radius of a satellite coverage range according to the DCP number, and calculating the DCP number on each radius;
3) the DCPs are uniformly distributed at nodes of a cellular network, and the distribution condition of the DCPs in the satellite coverage range is determined through the mapping relation between the DCP number on the radius and the DCP number in the coverage range in consideration of the satellite movement characteristics.
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| CN113037358B (en) * | 2021-03-02 | 2023-04-18 | 南京邮电大学 | Low-orbit satellite Internet of things service model establishing method based on attractor selection algorithm and multi-satellite load balancing method |
| CN113114336B (en) * | 2021-03-19 | 2022-04-29 | 北京邮电大学 | Method and device for determining switching threshold in low-earth-orbit satellite communication network |
| CN114173402A (en) * | 2021-12-09 | 2022-03-11 | 广州爱浦路网络技术有限公司 | User terminal dormancy control method, heaven-earth integrated communication network and storage medium |
| CN114900224B (en) * | 2022-04-15 | 2023-06-09 | 中国电子科技集团公司第十研究所 | Method for aircraft handover target measurement and control satellite and related equipment |
| CN115913323A (en) * | 2022-10-14 | 2023-04-04 | 西安空间无线电技术研究所 | Low-orbit access selection method based on space-time grid and storage medium |
| CN116208222A (en) * | 2022-12-08 | 2023-06-02 | 中国联合网络通信集团有限公司 | Data transmission method, device, equipment and storage medium |
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