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 signals are one of the key data types for flight control computers. A kind of A / D conversion unit with high speed and high precision is designed to suppress noise and electromagnetic interference. Take differential signal acquisition circuit, combined with hardware and software forming filter design techniques, to suppress and eliminate noise interference, and enhance the stability of A / D sampling data purposes. The test results show that the resolution of the high-precision A / D data acquisition unit reaches 15 bits and the precision reaches 14 bits under the typical interference conditions. Compared with the original sample flight control computer A / D unit, the data acquisition accuracy is improved by 2 ~ 3, stable, to meet the UAV flight control computer analog data acquisition requirements.