Method of realizing sampling data stream low-delay transmission based on 10 gigabit Intel network card

Abstract

The invention belongs to the field of radio and satellite navigation simulator and relates to a method of realizing sampling data stream low-delay transmission based on a 10 gigabit Intel network card. The method comprises the steps of (S1) loading a drive program and initializing the 10 gigabit Intel network card; (S2) mapping each caching node in a data caching block queue into memory space of an application program; (S3) sending time mark messages to the 10 gigabit Intel network card every 1 ms at a digital-analogue conversion device end; (S4) after reception of the time mark messages whichare sent every 1 ms is interrupted, parsing timestamp information in the time mark messages by the drive program; (S5) starting to generate sampling data at the 1 ms by the application program when the drive program sets a 1 ms time d arrival mark; (S6) obtaining caching node data based on the timestamp information; (S7) composing an Ethernet transmitting frame based on the caching node data; (S8) assigning a packet head and a packet body to two different DMA transmission descriptors, separately, configuring the DMA transmission descriptors to DMA engine register space of the 10 gigabit Intelnetwork card and starting up data transmission.

Description

technical field [0001] The invention belongs to the technical field of software radio and satellite navigation simulators, and in particular relates to a high-speed, low-delay, low-jitter real-time data transmission method between sampling data generation software and digital-to-analog conversion hardware based on IntelES82599 10 Gigabit network card. Background technique [0002] Satellite navigation signal simulation is a device that simulates satellite radio frequency signals received by transmitter receivers. It can easily test and verify receivers and other equipment. It is one of the important test equipment in the field of satellite navigation. A navigation simulator mainly consists of two parts: a mathematical simulation module and a signal generation module. An important link in the signal generation module is to generate discrete sampling digital signals according to a certain sampling rate and then convert them into analog signals. [0003] At present, the mainst...

AI Technical Summary

Problems solved by technology

[0006] (2) Insufficient flexibility

It makes the signal generation device not be used as a general signal generation platform, which is not flexible enough

[0007] (3) The ability to expand is limited

However, if you generally use a 10G network card for transmission, you need to use the network card driver provided by the manufacturer to send and receive data, and even the data stream will pass through the TCP / IP protocol stack of the operating system, which will seriously reduce the data transmission efficiency of the 10 Gigabit optical fiber network port. Real-time, delay jitter is very large

Images