Burst data downloading communication method for spacecraft multilevel subnets

Abstract

The invention discloses a burst data downloading communication method for spacecraft multilevel subnets and belongs to the technical field of communication. A remote terminal A remote control package is produced by a ground station, packaged in a remote control frame and transmitted to a primary subnet main control terminal. All-level subnet main control terminals judge whether the remote control frame belongs to the level subnet. If the remote control frame belongs to the level subnet, a corresponding remote terminal is informed to prepare data so as to carry out other operations, and otherwise the remote control frame is transferred to a sub-level subnet main control terminals until the remote terminal A is informed to prepare data. After the data is well prepared by the remote terminal A, request is put forward. Once all-level subnet main control terminals search for the request of the remote terminal A, data is obtained, and then requests are put forward to the super-level subnet main control terminals until the data reach the primary subnet main control terminal. The primary subnet main control terminal forms the received data to burst data downloading frames, corresponding data channels are scheduled to finish downloading. After the downloading is fished, transmission of regular data downloading is recovered. The burst data downloading communication method is capable of improving flexibility of the burst data downloading of spacecraft mounted network transmission.

Description

technical field [0001] The invention discloses a burst downlink data communication method for multi-level subnets of spacecraft, which belongs to the technical field of communication. Background technique [0002] According to the network topology, the spacecraft on-board network is composed of multiple subnets. Each subnet has a master control terminal and multiple remote terminals. The master control terminal also serves as the remote terminal of the upper-level subnet, connecting the two subnets. ,like figure 1 As shown, subnet 1 is the highest-level subnet of the entire network, and the master terminals of subnets 2 and 3 also serve as remote terminals of subnet 1, thus connecting the three subnets into one. The downlink data transmitted in each subnet must pass through the main control terminal of the subnet. Through this connection method, multiple subnets constitute a complete onboard network, and all downlink data is finally collected through the main control termi...

AI Technical Summary

Problems solved by technology

The values ​​of T1 and T2 are affected by the characteristics of the communication protocol and physical layer of subnet 1 and subnet 2, and sufficient time margin must be ensured, which is not efficient

[0010] At the same time, when the on-board network expands to multi-level subnets, when the master control terminal initiates the burst data acquisition process, it needs to go through multiple operations of issuing instructions, retrieving data, and obtaining from the upper-level subnet. According to the characteristics of the subnet, a delay will be added to the uppermost subnet, and the delay will increase, and it will be affected by the network characteristics of different lower-level subnets. The delay is not a general value. The main control terminal The control logic is bloated and difficult to implement

Moreover, the master control terminal at each level needs to understand the data content and mark the data layer by layer according to the content. In this way, the master control terminal at the upper level must understand the composition and characteristics of all lower-level subnets. The design is complicated and does not meet the requirement that the subnets are independent of each other. The design principle is very unfavorable to the expansion of the network

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