基于CPLD和DSP的不同采样速率多路数据采集系统的设计

New Method of Designing a Multi-channel Data Acquisition System with Different Sampling Rate Based on CPLD and DSP

针对星载电场探测仪星内信号采集与处理系统的应用需求,提出了一种新的基于CPLD和DSP的多路数据采集系统的设计方法,并通过系统设计验证此方法的可行性。该方法利用CPLD为DSP提供AD的数据和控制接口,屏蔽了不同AD的差异对DSP软件的影响,实现了硬件电路的模块化设计,从而有较好的可扩展性和可操作性。该系统有三路数据采集通道,使用了三种不同型号的AD进行采样,以实现不同的动态范围、采样速率与采样精度。通过仿真和系统验证证明了该方法的可行性和可操作性。

A new method of designing multi-channel data acquisition system for spaceborne electric field sensor with different sampling rate using CPLD and DSP was introduced.CPLD was used to control AD in different sampling channels and provide a common interface to access AD convert results for DSP.The system has three sampling channels and three different kinds of AD.Two methods were introduced for comparison.The method is testified by system simulation and system design.