Multiple Channels Of Simultaneous Data Acquisition System Design And Implementation

Data acquisition system has a very wide range of applications in radar systems, mainly used in the collection and storage of radar echoes. In the imaging array radar, phased array radar, distributed radar system, because of multi-channel transceiver, receiving signal has the need for coherent signal processing, broad signal bandwidth, and high pulse repetition rate, so the need for the data acquisition system with multi-channel synchronous data acquisition and high-speed collection, transmission and storage capacity is strong. In this paper, a radar system designed to complete the multi-channel synchronous data acquisition system, the synchronization of the system, transmission and storage, such as performance testing, to meet the system requirements for the technical indicators.First of all, this paper, research the multi-channel high-speed data acquisition system channel and the application of synchronous acquisition, Studied the system for high-speed data transfer and storage of the bus structure, the characteristics of disk array technology and the realization of the method; Study the evaluation of multi-channel data acquisition system channel delay and analyzing the performance of three algorithms and applications, mathematical methods are as follows: discrete Fourier transform ( DFT), sine wave fitting and Kalman filtering algorithms.Second, in this paper, according to the system design requirements, based on system requirements, select the data acquisition components, to build a collection by the four controllers and data acquisition system consisting of multi-channel synchronous data acquisition hardware system, enabling 96-channel, maximum 60MSPs per channel, sampling resolution is 12bit, inter-channel synchronization performance of less than 1ns, the speed of data transfer and storage than the data acquisition system 139.2MBPs.Then, this paper study the principle of virtual instrument, based on LabVIEW software development, using multi-threaded design to complete the technical design of the multi-channel data acquisition system software, achieved the acquisition and control, data transmission and storage, data playback functions.Finally, this paper carried out data transmission and storage system performance testing based on DFT algorithm, meet the system requirements of Specifications.