Multi-channel ARINC429 bus interface

Abstract

The invention provides a multi-channel ARINC429 bus interface which comprises a DSP (digital signal processor) module for receiving and transmitting the data of an ARINC429 bus interface module and a bus drive module, wherein the ARINC429 bus interface module is provided with two channel controllers, namely one transmitting channel controller for providing four channel data transmitting paths and one receiving channel controller for providing eight channel data receiving paths; when the DSP module transmits data, firstly the transmitting channel controller writes the data and command information to be transmitted, selects the transmitting channel number and sets the transmitting rate; the data is processed and packed in an FPGA (field programmable gate array); under the control of time sequence, the packed parallel data is converted into a serial digital signal and sent to the bus drive module; and through the drive circuit bus buffer, voltage comparison and waveform formation in the bus drive module, the digital signal is converted into an analog signal conforming to the ARINC429 bus level and sent to the preset transmitting channel.

Description

technical field [0001] The invention relates to a multi-channel ARINC429 bus interface IPCore module which is widely used in information exchange and transmission between avionics equipment. Background technique [0002] With the development of modern avionics technology, a large amount of information needs to be transmitted between the internal equipment of the avionics system, and the interface specifications and electrical indicators among the equipment manufacturers are not unified, resulting in many contradictions and conflicts of interconnection. In order to solve this problem, the aviation radio company jointly established by various avionics manufacturers, aircraft manufacturers and other institutions in the United States has formulated the ARINC429 specification, an industry standard for avionics system communication. This specification ignores the complexity of the interface between different manufacturers, and stipulates a unified interconnection interface technic...

AI Technical Summary

Problems solved by technology

However, most ARICN429 bus interface modules in China use single-chip microcomputer and protocol chip solutions. If you want to change the bus transmission rate, you need to change the crystal oscillator frequency of the module, which involves the modification of the module hardware, and the compatibility and maintainability are not strong.

[0005] Secondary anti-interference ability is weak

The working environment of airborne equipment is complex, and electromagnetic interference is likely to occur between each equipment

ARINC429 bus data transmission is susceptible to electromagnetic interference, resulting in glitches and distortions in the level. If only the ARINC429 level signal is sampled once in the sampling judgment, the result is easily interfered and leads to wrong judgments.

This requires the ARICN429 bus to be robust enough to prevent the impact of sudden level distortion and glitches on data judgment. However, the existing ARICN429 interface module cannot effectively prevent electromagnetic interference due to its fixed hardware structure and single sampling method. wrong judgment

[0006] Three is a single channel

With the development of avionics systems, the amount of data exchanged between devices is increasing, and the traditional single data channel can no longer meet the requirements. It is necessary to develop an interface module with multiple transceiver channels, and the transceiver channels can be flexibly combined and paired.

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