捷联惯性测高误差分析

在一些不能采用气压高度表或卫星、雷达信号实时测高的特殊且飞行时间很短的场合，利用惯性测量单元进行高度实时测量成为一种主要手段。鉴于惯性测高的发散性，对惯性器件和初始对准信息的精度有严格要求。本文从惯性测高原理及其发散性出发，建立了计算捷联惯性测高的误差方程，结合某载体再入轨道参数。对影响捷联惯性测高误差的各因素对测高误差造成的影响进行了估计，为惯性器件的选型和初始对准参数的给定提供了依据。

Error Analysis of Altitude Measurement Using Strap-down Measurement Unit

In some special instances, when barometers, satellites and radars are not able to be used to measure altitude, the use of IMU is a primary method. Since the exponential divergence of the altitude error, the measuring precision of IMU and alignment precision are required rigorously. The error equations are built based on the principle of inertial altitude measurement, and the altitude measurement errors resulted from the error factors are calculated based on the trajectory parameters of a reentry vehicle. This paper can provide some references for choosing inertial parts and the alignment parameter values.