Ethernet bus system for launch vehicle

Abstract

An Ethernet bus system for a carrier rocket comprises a telemetering module, a data interpretation and voting module, a time synchronizer, a plurality of sensors, an Ethernet bus A and an Ethernet busB, wherein the Ethernet bus A and the Ethernet bus B are hot backups for each other. The time synchronizer is used for ensuring the time synchronism of the Ethernet bus A and the Ethernet bus B. Busterminals of the Ethernet bus A and the Ethernet bus B are connected with sensors, acquire data of the sensors according to a fixed period, and store the data and acquisition time information in a data cache region. The Ethernet bus A and the Ethernet bus B respectively compile the acquired data into telemetry data frames and send the telemetry data frames to the data interpretation and voting module; the data interpretation and voting module interprets the two groups of telemetering data frames and uploads the telemetering data frames without abnormality to the telemetering module; and the telemetering module modulates the received telemetering data frame and sends the modulated telemetering data frame to ground receiving equipment. Time synchronism and real-time performance can be guaranteed, system reliability is improved, and the using requirement of a carrier rocket is met.

Description

technical field [0001] The invention relates to an Ethernet bus system used for launch vehicles and belongs to the field of spacecraft electrical system design. Background technique [0002] With the demand for fault diagnosis, intelligent flight, full rocket information fusion and commercialization of the new generation of launch vehicles, more and more complex electronic devices will be applied. Among the rocket models in active service, the data interaction of the rocket-borne system mainly uses 1553B and RS-422 buses, the communication rate is low, and the number of terminal nodes that can be mounted is small, which cannot meet the needs of the new generation of rocket-borne large data transmission. [0003] At present, most of the rocket-borne equipment uses embedded systems, and the processor resources are limited, and aerospace products have strict requirements on product reliability. Therefore, there is an urgent need for a low-resource consumption, high-bandwidth, a...

AI Technical Summary

Problems solved by technology

The above characteristics of Ethernet make Ethernet widely used in the industrial field, and gradually applied in the field of avionics, but it has not yet involved the launch vehicle

At the same time, the retransmission mechanism of Ethernet leads to poor real-time performance and uncertainty. At the same time, it does not take into account the network performance guarantee after node and switch failures, and does not provide delay and synchronization guarantees.

The flight environment of the launch vehicle is harsh, so the traditional Ethernet bus cannot meet the requirements of the launch vehicle in terms of reliability and synchronization.

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