Inter-satellite multiple access method for LEO satellite network based on propagation delay

Abstract

The invention discloses a low-orbit satellite network inter-satellite multiple access method, which mainly solves the problem of low utilization rate of the existing frame structure. The solution is: 1) Construct a probability distribution model of the propagation delay of the entire network; 2) Design the respective initial frame structures using the extreme values ​​in the probability model in the multi-antenna multi-radio frequency channel and single radio frequency channel scenarios; 3) According to Constraints between propagation delay and sending and receiving time slots, optimize the initial frame structure of a single radio frequency channel, and obtain a frame structure suitable for large-capacity services; 4) For multi-radio frequency channel scenarios, design a unified frame for the entire network according to its initial frame structure structure, and dynamically adjust it according to the current propagation delay to obtain a frame structure suitable for large-throughput scenarios under multiple radio frequency channels; 5) design the corresponding receiving time slot to be the shortest, optimize the result of 4), and obtain adaptive Frame structure under business. The invention improves the utilization rate of the frame structure and can be used for the resource allocation of the inter-satellite link layer of the 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

Images