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  • 软件名称:利用星下点干涉相位法提高三维成像高度计测高精度
  • 软件大小: 0.00 B
  • 软件评级: ★★★
  • 开 发 商: 苗翔鹰, 苗洪利, 张旭东, 黄霞凤, 王桂忠
  • 软件来源: 《遥感技术与应用》
  • 解压密码:www.gissky.net

资源简介

摘要: 基线倾角是三维成像高度计获取海表面高度的一个重要参数。基线倾角误差造成的高程误差随着交轨距离增加而增大。微小的基线倾角误差在整个观测刈幅内会引起大幅度的高程测量误差,因此精确获得基线倾角值是十分必要的。星下点干涉相位与基线倾角具有较强的相关性,利用二者之间的关系进行基线倾角的计算可以获得比一般硬件测量更高的基线倾角测量精度,进而对基线倾角误差进行校正,以满足厘米级测高精度的需求。通过在仿真海面上进行基于几何关系模拟测量与高程重建,可以进行利用星下点干涉相位法校正基线倾角误差的研究。对已设定三维成像高度计的系统参数进行数值模拟,结果表明:在10-3rad的干涉相位测量精度条件下,基线倾角精度可以达到0.03角秒,在10~60 km刈幅范围内,对高程平均测量精度的影响由模拟硬件测量得到的0.36角秒对应的6.02 cm降低至0.48 cm,与理论计算结果一致,说明星下点干涉相位法能够有效地对基线倾角误差进行校正。 关键词: 三维成像高度计;  基线倾角;  星下点干涉相位;  测高精度     Abstract: Roll angle is an important parameter for three-dimensional imaging altimeter to measure Sea Surface Height.The height error due to the roll angle error grows linearly across the swath and a slight error of roll angle will results in a large height error within observation range.So a very accurate knowledge of the roll angle error is required.Nadir interferometric phase has a strong correlation with the roll angle,so using the nadir interferometric phase from the interference image can get roll angle more accurately than instrument measurements.It’s possible to meet the centimeter-level accuracy after correcting the roll angle error.Simulation measurement and elevation reconstruction based on the geometric relationship were performed,and the research of correction the roll angle error by nadir interferometric phase was carried out.Both theoretical calculation and numerical simulation show that the measurement accuracy of roll angle can be as high as 0.03 arcsecond when the accuracy of nadir interferometric phase is 10-3rad.In this case,the height measurement accuracy have been averaged across a swath between 10 and 60 km of nadir will decrease to 0.48 cm which is 6.02 cm when the roll accuracy is 0.36 arcsecond.It means that the nadir interferometric phase method can effectively correct the roll error of three-dimensional imaging altimeter.

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