A Calculation Method for Search Range of Microwave Scatterometer Data in Inversion of Sea Surface Wind Field
A sea surface wind field inversion and microwave scatterometer technology, which is applied in the fields of digital data information retrieval, calculation, complex mathematical operation, etc., can solve the problems of small specifications of scatterometer wind field products and insufficient application potential.
Active Publication Date: 2022-03-29
THIRD INST OF OCEANOGRAPHY MINIST OF NATURAL RESOURCES
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[0014] The purpose of the present invention is to provide wind data using on-site observations to solve the above-mentioned problems such as the lack of standards for determining the optimal search range and the method of calculating the range, resulting in fewer product specifications for the scatterometer wind field, and not fully exploring its application potential. Establish the standard for the optimal search range of the backscatter coefficient in the wind field inversion of the microwave scatterometer, realize the calculation of the optimal range, and achieve good results. A calculation method for the search range of the microwave scatterometer data in the sea surface wind field inversion
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[0037] The present invention will be further described below in conjunction with drawings and embodiments.
[0038] Embodiments of the present invention include the following steps:
[0039] 1. NDBC buoy data preprocessing. That is, the null and illegal values in the single-site wind data are eliminated.
[0040] 2. Extract the measured wind data and construct a wind vector set. The set is expressed as A(time, lon, lat, ws, wd); where time is the collection time of the wind data (UTC time), lon is the longitude of the wind data at this time, lat is the latitude of the wind data at this time, and ws is the wind speed at this moment, wd is the wind direction at this moment; the nth data is expressed as A n (time n , lon n , lat n ,ws n ,wd n ).
[0041] 3. Data preprocessing of HY-2A scatterometer. That is, null values and illegal values in the scatterometer data are eliminated.
[0042] 4. Establish a search range sequence T(T 1 = 0,T 50 =50), that is, the sp...
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A method for calculating the search range of microwave scatterometer data in sea surface wind field inversion, NDBC buoy data preprocessing; extracting measured wind data, constructing a wind vector set; HY‑2A scatterometer data preprocessing; establishing an initial value of 0km, step by step The search range sequence T with a long value of 5km and a maximum value of 50km is the spatial range involved in the calculation of the backscatter coefficient of the unit wind field; according to the extraction results, traverse all the vectors in the set A to extract the scatterometer data; for the sequence T Perform normalization processing, and the step size is 0.02, then T is obtained; traverse the data set A to calculate the wind field inversion error, that is, for the nth wind vector A n , calculate the corresponding sequence B n Medium wind speed, wind direction value and A n The absolute error of the value is normalized, and the error array e∈(0,1) is obtained; the scatter diagram of e and T is drawn, the curve is fitted, and the minimum value is searched along the 45° direction, and the corresponding sequence value is Optimal search range value.
Description
technical field [0001] The invention belongs to the technical field of marine remote sensing, and in particular relates to a calculation method for searching range of microwave scatterometer data in sea surface wind field inversion. Background technique [0002] The sea surface wind field is an important factor affecting waves, currents, and water masses and a basic parameter of ocean dynamics. It is of great value in improving the accuracy of global atmospheric and ocean dynamics forecast models. At the same time, the sea surface wind vector is the main factor affecting navigation, sea operations, fishery production, etc., and it is the key to optimize routes, guarantee routes, avoid typhoons, and search and rescue work. Therefore, the observation of sea surface wind vectors is of great significance [1] . [0003] Satellite remote sensing has become the main means of global wind vector observation due to the advantages of large-area synchronous measurement, fast acquisitio...
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IPC IPC(8): G06F16/2453G06F17/10
CPCG06F16/2453Y02A90/10
Inventor 魏士俨杨晟
Owner THIRD INST OF OCEANOGRAPHY MINIST OF NATURAL RESOURCES