Multichannel large-dynamic range data acquisition system

Abstract

The invention provides a multichannel large-dynamic range data acquisition system, which is realized on the basis of FPGA. The data acquisition system comprises multiple paths of parallel data acquisition channels used for conditioning and amplifying to-be-detected analog signals and converting the analog signals after conditioning and amplifying into digital signals, an acquisition control module used for controlling and managing each data acquisition channel, that is, starting or stopping command of each channel, issuing of gain parameters, arrangement and extraction of data of each data acquisition channel and packing of upload data, a bus control module used for controlling the multichannel large-dynamic range data acquisition system to access and communicate with an external bus according to a CPCI bus protocol and self defining DSP and MCU interface, and a clock management module used for providing clock for the analog-to-digital converter of each data acquisition channel, the acquisition control module and the bus control module.

Description

technical field [0001] The invention belongs to the field of underwater acoustic signal processing and underwater acoustic electronic design, and in particular relates to a data acquisition system with multiple channels, large dynamic range, low input noise, and low interchannel crosstalk. Background technique [0002] The data acquisition system is an essential part of the underwater acoustic signal processing equipment. With the advancement of modern underwater acoustic signal processing technology, the number of channels for underwater acoustic signal acquisition is gradually increasing, so a highly integrated multi-channel data acquisition system is of great significance to the practice of modern underwater acoustic signal processing technology. At the same time, due to the characteristics of the underwater acoustic signal and the particularity of the underwater environment, the data acquisition system used in the underwater acoustic signal processing system requires a l...

AI Technical Summary

Problems solved by technology

However, these converter chips generally have difficulty in achieving low harmonic distortion and low channel-to-channel crosstalk performance by multiplexing a single ADC integrated inside by multiplexing switches

Input noise, harmonic distortion, and crosstalk between channels can greatly reduce the effective dynamic range of data acquisition

[0004] In summary, the existing multi-channel data acquisition system is difficult to balance the number of channels and the performance of dynamic range, and it is not well adapted to the application in the field of underwater acoustic signal processing.

Images