To meet the demand to set parameters sampling rate flexibly in a flight test mission , the paper designed a new voltage signal acquisition circuit using 8-channel high-speed synchronous AD converter and large-scale FPGA in an airborne universal acquisition equipment , based on theory of multi-rate signal acquisition and processing. Users can get the desired output rate signal by oversampling and gradual decimation filtering. The circuit can effectively filter out noise and improve SNR. After laboratory and flight test validation, the hopping code data output of this method is reduced by several times than traditional treatment methods.%本文为满足飞行试验测试任务对参数采样率进行灵活设置的要求,基于多速率信号采集处理的理论,采用8通道高速同步AD转换器和大规模FPGA设计了新的机载通用采集器电压量信号采集电路.通过过采样和逐级抽取滤波,获得用户所需信号输出速率.该电路可以有效滤除噪声干扰,提高信噪比.经过实验室和飞行试验验证,较传统处理方法输出数据跳码减少数十倍.
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