Propagation delay-based inter-satellite multiple access method for low-earth-orbit satellite network

Abstract

The invention discloses an inter-satellite multiple access method for a low-earth-orbit satellite network, and mainly solves the problem of low utilization rate of an existing frame structure. According to the scheme, the method comprises the following steps: 1) constructing a probability distribution model of whole network propagation time delay; 2) respectively designing respective initial framestructures by using extreme values in the probability model in a multi-antenna multi-radio-frequency channel scene and a single-radio-frequency channel scene; 3) optimizing the initial frame structure of the single radio frequency channel according to the constraints between the propagation time delay and the sending and receiving time slots to obtain a frame structure suitable for the high-capacity service; 4) for the multi-radio-frequency channel scene, designing a unified frame structure of the whole network according to the initial frame structure, and dynamically adjusting the frame structure according to the current propagation time delay to obtain a high-throughput scene frame structure adapting to the multi-radio-frequency channel; and 5) designing the corresponding receiving timeslot to be the shortest, and optimizing the result of the step 4) to obtain the frame structure adapting to the sensitive service. The utilization rate of the frame structure is improved, and the method can be used for resource allocation of an inter-satellite link layer of a satellite network.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an inter-satellite multiple access method of a consistent low-orbit satellite network, which can be used for resource allocation of an inter-satellite link layer of the satellite network. Background technique [0002] Mobile satellite communication systems are the best solution, and probably the only one, for complete "global communication coverage". They have been continuously studied since the 1950s and today find widespread use in areas such as military applications, remote sensing for disaster mitigation, and providing television and Internet services around the globe. Due to its wide coverage, satellites can extend the ground network to the space field, which adds greater flexibility to the network with large bandwidth. [0003] In the past few years, the number of Internet users has exploded, and in the next few years, it will continue to remain the same....

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1) The satellite link power is not easy to control, if it is too large, neighbor satellites will be affected, if it is too small, the communication quality will be damaged

2) The guard interval of the frequency band is not easy to control. If it is too large, the frequency domain resources cannot be effectively used. If it is too small, the accuracy of the hardware device will be very high when filtering.

3) The working power of the transponder is relatively large, and the intermodulation effect will occur when amplifying multiple carriers at the same time

However, this method is only analyzed in the scenario of multi-antenna single radio frequency channel, and only uses the extreme value of the propagation delay of the whole network to design the frame structure, and does not consider the distribution of other propagation delay segments on the frame structure design. As a result, there is still 9ms idle time in the receiving time slot of each frame, and the time-frequency resources are not fully utilized

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