Time diffusion route search method of satellite DTN (Delay/Disrupt-Tolerant Networking) network

Abstract

The invention provides a time diffusion route search method of a satellite DTN (Delay / Disrupt-Tolerant Networking) network, wherein the method is used for solving a route selection problem of an intermittent relay satellite network, and is obtained by CGR (Contact Graph Routing) principle improvement. An ERSA algorithm described in the invention calculates all information of a time-varying network, and the paths searched by the ERSA algorithm comprise a directly connected end-to-end path and a path for storage waiting for communication through a discontinuous link, and quantitative analysis is performed on the paths. Two new path measuring standards consider the transmission performance of the link, so as to guarantee the successful delivery rate and the shortest reach time of data. The increment of available paths improves the utilization rate of the algorithm for the system throughput performance. The time diffusion route search method of the satellite DTN network provided by the invention obtains a more efficient routing design and transmission quality by utilizing the overall inspection information of the network and the real-time network condition; therefore, compared with the traditional method, the method has certain advantages both in objective elevation index and subjective visual effect.

Description

technical field [0001] The invention belongs to the technical field of deep space communication, and in particular relates to a route search method of a satellite DTN network. Background technique [0002] The near-Earth satellite space network is a dynamic and complex network system. High-orbit satellites with better coverage are used as backbone nodes to provide data communication support for low-orbit remote sensing satellites and unmanned aerial vehicles. Due to its orbital characteristics, the communication time between a single earth observation remote sensing satellite and the ground station is relatively short. Laying a constellation with global coverage to support a single mission will make the cost too high, and a relay network of several satellites can significantly improve the timeliness of transmission tasks. Compared with the ground network, the space network relayed by several satellites has the following characteristics: [0003] 1. In-orbit satellites oper...

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Problems solved by technology

[0005] 3. The two-way link has asymmetric transmission rate and high bit error rate characteristics, and the propagation delay is large

In the satellite network, the above method has two problems: 1. Due to the high-speed movement of the satellite in orbit, the link distance between the two satellites is constantly changing, and the fixed link weight is used when the topology structure does not change. The obtained results will deviate greatly from the actual

The above method ignores the retransmission phenomenon caused by bit errors in the link

A path with a theoretical best arrival time may cause link congestion due to a very high retransmission rate on one of its links

[0026] Problems such as sudden node failures often lead to poor performance of theoretically optimal paths in practice

DRSA relies on a simple network and the transmission time is much smaller than the network change rate. Once the network scale increases, its transmission performance will decrease

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