There exists a slope drift in an integral gyro when it is used as an azimuth gyro, which may cause serious heading and position errors in the Inertial Navigation System (INS).
As expected, the measured brightness temperatures change with view zenith angle, view azimuth angle, and the Sun position.
地面亮度温度的测量值随观测天顶角、方位角和太阳位置而改变。
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This article gives a method of getting position by altitude and azimuth of simple celestial body, the result is very important for improving the chance of celestial positioning.