| Satellite radar altimeter is an important tool for real-time monitoring of the ocean. So far, the world has launched a number of countries carrying radar altimeter satellites. Spaceborne radar altimeter measurements of high-weather and all-time, worldwide detection capability, time monitoring and observation of the marine environment, including a variety of marine power to obtain significant wave height values of environmental parameters, wind speed, sea surface temperature, and directly to disaster early warning and forecasting of sea state provides real-time monitoring data; for marine environmental protection, marine resources development, marine disaster prevention and mitigation, marine scientific research and national defense construction and other support services to provide authoritative. Based on these factors, China has also launched HY-2 satellite in 2011.Through the deep study of the HY-2(No. ocean 2) satellite works, the error in all aspects of our spaceborne radar altimeter altimeter may exist with in-depth understanding. This article focused on data from the National Oceanic Offshore Centers for Environmental Prediction provided by the process of the altimeter signal delay errors echo waveform correction factors and the ionosphere and gives the analysis and research. First, calculate the height of the ocean sea level, according to the existing model for tracking and analysis of spaceborne radar altimeter echo waveforms to identify the various factors affecting the echo waveform, the use of regression analysis and cross-algorithm derived discrete points crosspoint satellite trajectory, and the corresponding calibration; secondly, using several interpolation algorithm on each crosspoint significant wave height, ocean wind speed and sea level, the difference between the results of the analysis to compare different methods of optimal difference method; final for data from the National Oceanic Offshore Centers for Environmental Prediction provided analyzes of the ionospheric delay error, compared to the several known ionospheric model with its own dual-correction effects, the results show that the best GIM model corrections and suggestions in double frequency correction effect is not the ideal place for the use of GIM model corrections. In addition, this paper analyzes the time series filtering principle of the significant wave height were treated to obtain a high signal to noise ratio of dry waveform data can then use these data to a pulse signal and the sea that is the role of electromagnetic deviation error analysis; ionospheric delay The error is mainly due to the occurrence of an electromagnetic signal propagation in the ionosphere refraction caused by the use of dual-band(Ku-band and C-band) measurement mode to reduce the influence of the ionosphere, using Bayesian statistical theory of the two bands(Ku band and C-band) were measured high noise variance processing, the ionospheric delay error reduction to less than centimeters. At the same time, using the above method of T / P and JASON-1,2 series of satellite data processing, the results obtained with the HY-2A satellite data processing results were compared, easy to find sources of error and thus reduce the merits of error analysis model degree.Error analysis and calibration of marine radar altimetry satellite altimetry data, altimetry data for the application plays an important role, with the continuous improvement of HY-2A satellite data processing technology, along with the corresponding error analysis should be improved, thereby improving measurement accuracy, improve the scientific value of satellite data... |
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