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An Efficient Resource Scheduling Method for Small Satellite Networks Based on Earth Observation Missions

A satellite network and resource scheduling technology, applied in the field of satellite communications, can solve the problems of small amount of transmission, inapplicability to satellite systems, and resource scheduling methods that do not consider the limitation of on-board energy and storage resources. The effect of improving resource utilization efficiency

Active Publication Date: 2019-01-25
陕西丝路天图卫星科技有限公司
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  • Application Information

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Problems solved by technology

[0005] However, the above two resource scheduling methods do not consider the limitation of onboard energy and storage resources, and do not consider the specific task requirements. They only study the scheduling strategy of links in the network from the perspective of network topology, which is not applicable to existing satellite system, so that in the case of actual mission requirements, the above two strategies may only transmit a small amount of business

Method used

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  • An Efficient Resource Scheduling Method for Small Satellite Networks Based on Earth Observation Missions
  • An Efficient Resource Scheduling Method for Small Satellite Networks Based on Earth Observation Missions
  • An Efficient Resource Scheduling Method for Small Satellite Networks Based on Earth Observation Missions

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Embodiment 1

[0039] The present invention is an efficient resource scheduling method for small satellite networks based on earth observation tasks, referring to figure 1 , the specific implementation steps of the present invention are as follows:

[0040] (1) Initialize the network parameters. The ground control center determines the type and number of nodes in the network according to the studied earth observation scenario, and performs network analysis according to the current latitude and longitude of the satellite nodes, ground station nodes and mission observation points in the network. Satellite nodes, ground station nodes and mission observation points are numbered.

[0041] (2) Time slot division, the time set Γ={1,2,...i...T} given by the ground control center for network resource scheduling planning, where 0 is the 0th time slot, that is, the initial time slot, i represents the i-th time slot, each time slot is equal in length, Δt is the length of the time slot, and the current ...

Embodiment 2

[0060] The efficient resource scheduling method for the small satellite network based on the earth observation task is the same as that in Embodiment 1, and the present invention will be described in detail below in combination with specific calculations. see figure 1 , the specific steps include:

[0061] Step 1, the initialization step, that is, the ground control center numbers the satellite nodes, ground station nodes, and mission observation points in the network according to the current latitude and longitude of the satellite nodes, ground station nodes, and mission observation points in the network.

[0062] (1a) Given a satellite network scenario: there are N in the network s observation satellites, N g ground stations, N o Observation points and a ground data center dc, S is the collection of observation small satellites, G is the collection of ground stations, and O is the collection of observation points.

[0063] (1b) According to the geographic location of sma...

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Abstract

This invention discloses a method for scheduling efficient resource of a minisatellite network based on earth observation tasks, and solves the problems that the end-to-end throughput capacity is low and the utilization efficiency of the network resource is low because the network resource is not fully considered during the scheduling process in the earth observation scene of the resource-limited minisatellite network. The method comprises the implementation processes of: according to an initial network topology, determining a node number; at the same time, initializing a network resource scheduling planning time set; according to current network state and resource scheduling conflict restraint, constructing a link scheduling conflict graph by a ground control center; solving a maximal independent set corresponding to the conflict graph to acquire a network conflict-free scheduling link set; by using the link set and a linear programming, solving a resource allocation scheme and a data transmission method capable of mostly optimizing the network efficiency till a time slot is ended. The method improves the resource utilization ratio, increases the returning efficiency of important task data, improves the earth observation network performance of the minisatellite, and is used for scheduling the efficiently transmitted resource of earth observation system data.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and mainly relates to a conflict-free allocation scheme of space-borne resources and a reasonable planning of data transmission mode, specifically, an efficient resource scheduling method for small satellite networks based on earth observation tasks, which can be used for small satellites Network Earth Observation System. Background technique [0002] Compared with the earth observation network relayed by geostationary orbit satellites, the small satellite network has the characteristics of low delay, low path loss and low power because it is distributed in low-level orbits. An indispensable platform facility system required by more and more Earth observation missions. In addition, through the cooperation between small satellites, the efficiency of observation data return is improved, so that when a certain observation small satellite needs to return its observation data to the g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185
CPCH04B7/1851
Inventor 盛敏周笛李璇李建东刘润滋徐超汪宇张琰
Owner 陕西丝路天图卫星科技有限公司
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