Multi-channel signal preprocessing system and method based on FPGA

Abstract

The invention belongs to the field of digital signal processing, and discloses a multi-channel signal preprocessing system and method based on an FPGA. Firstly, an AD configuration module generates a control signal to complete configuration of eight AD chips, the AD chips start to work after configuration, differential clock and differential data signals are sent to an AD clock module and an AD data module in the FPGA respectively, the AD clock module converts a differential clock into a single-ended clock and sends the single-ended clock to the AD data module, the AD data module converts a differential data signal into a single-channel data signal and outputs 32-channel data to the digital down-conversion module for DDC processing, and then a processing result is sent to the optical fiber sending module and sent to a next-stage signal processing unit through an optical fiber. The system is simple in structure. According to the preprocessing method, the problem that multi-channel sampling data of an existing data acquisition system are not synchronous can be solved, data acquisition of large-scale multi-channel signals is achieved, and the data rate is reduced through the digital down-conversion module.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to an FPGA-based multi-channel signal preprocessing system and method, which is suitable for receiving multi-channel radar echoes with high real-time performance and large data volume. Background technique [0002] With the application and development of modern electronic technology, more and more electronic applications are changing from analog systems to digital systems. It is becoming more and more important in analog-to-digital conversion. In practical engineering applications, the data acquisition system is required to have the characteristics of real-time processing, high speed, multi-channel and system stability. Multi-channel synchronous high-speed data acquisition system is widely used in many occasions, and it is an indispensable early stage of digital signal processing, and the synchronization between channels is often a key part of the data acquisition system. I...

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Problems solved by technology

[0004] For the problems existing in the prior art, the purpose of the present invention is to provide a multi-channel signal preprocessing system and method based on FPGA. The problem of asynchronous sampling data, realize the data acquisition of large-scale multi-channel signals, and reduce the data rate through the digital down-conversion module

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