An Ethernet bus system for launch vehicles

Abstract

An Ethernet bus system used for launch vehicles, including a telemetry module, a data interpretation and voting module, a time synchronizer, a plurality of sensors, an A Ethernet bus and a B Ethernet bus that are mutually hot backup. The time synchronizer is used to ensure the time synchronization of A and B Ethernet buses. The bus terminals of the A Ethernet bus and the B Ethernet bus are connected to the sensor, and the data of the sensor is collected according to a fixed cycle, and the data and the collection time information are stored in the data buffer area; the A Ethernet bus and the B Ethernet bus respectively store the collected data Compile telemetry data frames and send them to the data interpretation and voting module; the data interpretation and voting module interprets two sets of telemetry data frames, and uploads the telemetry data frames without exception to the telemetry module; the telemetry module modulates the received telemetry data frames and then sent to the ground receiving equipment. The invention can ensure time synchronization and real-time performance, improve system reliability and meet the use requirements of launch vehicles.

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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