Method for acquiring and transmitting mass data in astronomical telescope control system

Abstract

A method for collecting or transmitting a mass of data in an astronomical telescope control system belongs to the automation control field, which includes steps as following: step 1, preparing protocol headers of protocols of each layer when starting the procedure of astronomical data collection, utilizing the Mason Express function to manually produce a required protocol header, and skirting an LWIP protocol stack running in a Nios II embedded system, step 2, setting a global pointer in the Mason Express function for the skirted LMIP protocol stack, obtaining a semaphore handle from the inside of the LWIP protocol stack, simultaneously, enabling data to be sent by the LWIP protocol stack to be kept in a waiting status before the Mason Express function sending data, and thereby avoiding safety hazards resulting in thread conflicts. By manually producing the required net protocol header, the invention can realize a data transfer rate higher than 90MB / s from an embedded system to a data collecting computer.

Description

technical field [0001] The invention relates to a method in the technical field of automatic control, in particular to a method for collecting and transmitting a large amount of data in an astronomical telescope control system. Background technique [0002] In various fields such as modern measurement, monitoring, control, diagnosis, scientific experiment, etc., the data acquisition system is an indispensable part. The data acquisition system is commonly used in astronomical observation systems to realize the transmission of observation data (images, spectra, etc.) from the telescope to the control computer. According to different application requirements, different data acquisition schemes can be selected: such as data acquisition card scheme, USB acquisition scheme and network acquisition scheme. Generally speaking, in addition to a certain transmission rate for astronomical data acquisition, a longer transmission distance is very important, because in the process of astr...

AI Technical Summary

Problems solved by technology

But since the introduction of the Nios II embedded central processing unit, the data transmission rate of Ethernet has been the bottleneck of the whole system performance

[0004] According to the literature search of the existing technology, Han Lichang and Xu Xinqi published "Design of Large-Scale Astronomical Telescope Environmental Temperature Data Acquisition System" published in "Computer Engineering" No. 6, 2006. In the design of the environmental monitoring system of the target fiber optic spectroscopic telescope LAMOST, USB technology is used for fast data transmission and control. Although many measures have been taken (such as using UDP instead of TCP, disabling UDP checks, etc.), the Cyclone 1C20 development board In fact, the network transmission speed can only reach about 1.21MB / s, which is far from meeting the needs of a large number of astronomical data acquisition applications.

In addition, although many manufacturers have developed Gigabit or even 10 Gigabit Ethernet TP cores for Nios II embedded systems, these TP cores are not only expensive, but the programming is complicated and huge, and many of them need to cooperate with special hardware or TCP / IP protocol stack to work

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