Line-of-sight pointing accuracy improvements through analytic boresighting
Line-of-sight pointing accuracy improvements through analytic boresighting
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DOI：
10.1109/7.869517
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发表时间：
2000-07
期刊：
影响因子：
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通讯作者：
S. P. Karatsinides
中科院分区：
文献类型：
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作者：
S. P. Karatsinides
视线传感器的仪器轴通常通过地面技术与飞机机身轴对准。由于机器人设备的限制，剩余的残留误差导致系统性能下降。本文提出了一种在飞行中连续标定弹体剩余误差的方法。这极大地提高了视线指向机械化的精度，并且还消除了对周期性的基于地面的重新校准的需要，该重新校准往往是劳动密集型的并且昂贵的。该方法利用卡尔曼滤波器，估计的基础上的期望和测量的视线的被测地面目标之间的差异的botherwise误差。飞机位置和测量的目标位置定义了预期的视线，传感器万向节的方位角和仰角定义了测量的视线。船载INS/GPS导航仪的精度足以使分析校准实用化。通过飞行试验结果证明了该方法的优点。
Instrument axes of line-of-sight sensors are normally boresighted to aircraft body axes through ground based techniques. Due to limitations in the boresight equipment, remaining residual errors result in degraded system performance. A method for a continuous in-flight calibration of the boresight residual errors is presented. This improves dramatically the accuracy of the line-of-sight pointing mechanization, and it also eliminates the need for periodic ground based recalibrations which tend to be labor intensive and expensive. The method utilizes a Kalman filter that estimates the boresight errors based on the difference between the expected and measured line of sight of a surveyed ground target. The aircraft position and the surveyed target location define the expected line of sight, and the azimuth and elevation angles of the sensor gimbals define the measured line of sight. The accuracy of a shipboard INS/GPS navigator is sufficient to make the analytic calibration practical. The benefits of the method are demonstrated through flight test results.