基于图像导引头及惯导相对位置信息的弹目距离估计算法

针对远程图像制导空地导弹无GPS信息条件下,惯导长时间工作后位置精度较差,无法满足剩余制导时间计算要求的问题,提出基于图像导引头角量测及导弹相对位置与高度信息弹目相对距离估计算法,并分析了典型误差条件下不同采样计算频率对算法精度的影响,结合弹道特点给出算法具体应用方案及剩余制导时间计算策略.通过仿真计算,验证了算法具有较高的计算精度,有实际工程应用价值.

Method of Range Estimate Based on Relative Position Information of Image Seeker and INS

The computational method of range estimate is presented to deal with the problem that the accuracy of position is too low to satisfy calculating the time-to-go because the pure INS has worked for long time without GPS. The messengers used by method include sight line angle from image seeker, relative position and altitude from INS. Under typical measuring errors, the influence of sampling frequency on estimation accuracy was analyzed. The engineering application scheme and time-to-go calculation strategy were given. The simulation results show that the accuracy of the range estimate is well enough to be used in engineering.