A New Method for Computing Radar Altimeter Lookup Correction Table and Its Application
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摘要: 在计算雷达高度计的重跟踪修正表时，目前通常的做法是将平坦海面脉冲响应函数用指数函数近似表示，并忽略了这种近似对修正表的影响。该文对这一近似方法的误差进行了分析，在此基础上提出了采用平坦海面脉冲响应函数准确形式计算重跟踪修正表的方法，利用该方法可以显著降低大误指向角情况下的参数反演误差。该文利用这一新方法计算了HY-2卫星雷达高度计的重跟踪修正表，并对其回波数据进行了处理。结果表明，采用该文提出的方法可以显著提高大误指向角情况下的参数反演精度。
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关键词:
- 雷达高度计 /
- 重跟踪 /
- 修正表 /
- 平坦海面脉冲响应函数
Abstract: Presently, the radar altimeter look-up correction tables are usually computed with an approximate exponential flat sea surface response function, and the effects of this approximation are neglected. In this paper, the errors of this approximation method are analyzed, and a new method of using the accurate flat sea surface response function is derived to compute the look-up correction tables. This new method can greatly decrease the errors when antenna mispointing angle is large. The new method is applied to HY-2 altimeter, and obtains a more accurate result.-
Key words:
- Radar altimeter /
- Retracking /
- Look-up correction table /
- Flat sea surface response
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