高精度气压高度表的研制

Development of High Precision Barometric Altimeter

研制了一款适用于小型飞行器和无人机的高精度气压式高度表。通过曲面拟合的方法,运用最小二乘法完成了对硅阻压力传感器的标定和误差补偿工作,提高了压力传感器的实际输出精度。对实际大气状况与标准大气不符时的气压高度原理误差进行了分析,提出了误差补偿的新方法。实验结果和理论分析吻合较好,表明气压高度表有效地补偿了压力传感器原始误差以及大气状况不符时的气压高度原理误差,提高了气压高度表高度信息的实际精度。

A high precision barometric altimeter is developed for small aircraft and unmanned aerial vehicles. The calibration and the error compensation of the silicon piezoresistive pressure sensor are achieved with surface fitting method based on the least squares method. And the actual precision of the pressure transducer output is improved. The theoretical error of the barometric altitude caused by the mismatch between the actual atmosphere situation and the standard atmosphere situation is analyzed. A new method for compensating the theoretical error is proposed. The theoretical analysis is in agreement with experimental results. The result shows that the barometric altimeter can compensate the error of the pressure sensor and the theoretical error of the barometric altitude caused by the mismatch. And the actual precision of the barometric altimeter output is improved.