Inference of Altimeter Accuracy on Along-track Gravity Anomaly Recovery

doi:10.11947/j.AGCS.2015.20140022

Abstract

Abstract: A correlation model between along-track gravity anomaly accuracy, spatial resolution and altimeter accuracy is proposed. This new model is based on along-track gravity anomaly recovery and resolution estimation. Firstly, an error propagation formula of along-track gravity anomaly is derived from the principle of satellite altimetry. Then the mathematics between the SNR (signal to noise ratio) and cross spectral coherence is deduced. The analytical correlation between altimeter accuracy and spatial resolution is finally obtained from the results above. Numerical simulation results show that along-track gravity anomaly accuracy is proportional to altimeter accuracy, while spatial resolution has a power relation with altimeter accuracy. e.g., with altimeter accuracy improving m times, gravity anomaly accuracy improves m times while spatial resolution improves m^0.4644 times. This model is verified by real-world data.

Key words: satellite altimetry, radar altimeter accuracy, along-track gravity anomaly, spatial resolution

CLC Number:

P228

LI Yang, ZHANG Running. Inference of Altimeter Accuracy on Along-track Gravity Anomaly Recovery[J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(4): 363-369.

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