模拟信号是飞行控制计算机关键数据类型之一。设计了一种对噪声和电磁干扰具有强抑制能力、高速、高精度A/D转换单元。采取差分信号采集电路, 结合硬件和软件成型滤波器设计技术, 达到抑制和消除噪声干扰、增强A/D采样数据稳定性之目的。测试结果表明, 该高精度A/D数据采集单元在典型干扰条件下数据采集分辨率达到15位, 精度达到14位, 相比较于原样例飞行控制计算机A/D单元数据采集精度提高2～3位, 工作稳定, 满足无人机飞行控制计算机模拟量数据采集要求。

Analog signal is one of the key data types of flight control computer.We designed a kind of A/D conversion unit with high speed, high precision and strong inhibiting ability to the noise and electromagnetic interference.To suppress and eliminate the noise interference and improve the stability of the A/D sampling data, we used the differential signal acquisition circuit, combining with the hardware and software design of the filter.The test results showed that:under the condition of typical interference, the high precision A/D units resolution of data acquisition reaches 15 bit and the accuracy is 14 bit.Compared with the original example of flight control computer, the A/D data acquisition precision is increased by 2~3 bits and flight control computer works stably, which meets the requirements of UAV flight control computer analog data acquisition.