Real-time data acquisition system and method

Abstract

The invention provides a real-time data acquisition system and method. The real-time data acquisition system comprises a sensor, a DAQ device and a computer. The sensor, the DAQ device and the computer are sequentially connected. The DAQ device comprises a programmable logic device and an ADC analog-digital converter. The sensor is used for acquiring analog data, and the ADC analog-digital converter is used for converting the analog data into digital data. The programmable logic device is used for filtering the digital data to generate filtered data, and transmitting the filtered data to a buffer of the computer. According to the system and method provided by the invention, the system can be implemented by using a general purpose microprocessor and the programmable logic device, and is compatible with an existing data acquisition apparatus structure; programmable parallel computing is applied to data acquisition; a non-real-time factor caused by CPU instruction serial and operating system scheduling is overcome; and higher performance is realized with extremely low hardware costs.

Description

technical field [0001] The present invention relates to data collection, in particular to a real-time data collection system and method. Background technique [0002] Data acquisition is the process of using a computer to measure electrical and physical phenomena such as voltage, current, temperature, pressure or sound. PC-based DAQ (Data Acquisition, Data Acquisition) systems leverage the processing, production, display, and connectivity capabilities of industry-standard computers to provide more powerful, flexible, and cost-effective measurement solutions. Whether it is a stand-alone data acquisition (acquisition card + local bus) or a multi-point distributed data acquisition device (upper computer + lower computer + field bus), it generally includes sensors, DAQ equipment (signal conditioning, digital-to-analog conversion), through standard computer A bus (or network) connects the computers. The DAQ system composition in the prior art is as figure 1 shown. [0003] Th...

AI Technical Summary

Problems solved by technology

The DMA method reduces the CPU usage and increases the transmission bandwidth, but it still cannot fundamentally meet the strict requirements of real-time systems on time, and in strong real-time application scenarios, DMA (Direct Memory Access, Direct Memory Access) is not allowed to occupy the bus for a long time , so the pure DMA technology also has certain disadvantages

The use of RTOS (Real Time Operating System, RealTime Operating System) task scheduling mechanism can improve real-time performance, but the disadvantage is that on the one hand, it increases the cost of system transplantation, and on the other hand, it is fundamentally limited. Based on the inherent defect of "instruction serial", real-time performance is not easy Meet the requirements of modern high-speed control systems

That is, the data processed at time Ty is the data at time T0, and the accuracy of Ty cannot be guaranteed more accurately under the cache-based mechanism, resulting in the inability to guarantee the real-time performance of the system

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