Calculation method of data searching range of microwave scatterometer in sea surface wind field inversion
A sea surface wind field inversion and microwave scatterometer technology, which is applied in computing, electrical digital data processing, special data processing applications, etc., can solve the problems of not fully exploring the application potential and the lack of scatterometer wind field product specifications
Active Publication Date: 2018-08-17
THIRD INST OF OCEANOGRAPHY MINIST OF NATURAL RESOURCES
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Problems solved by technology
[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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The invention discloses a calculation method of a data searching range of a microwave scatterometer in sea surface wind field inversion. NDBC buoy data are preprocessed; actually measured wind data are extracted, and a wind vector set is constructed; HY-2A scatterometer data are preprocessed; a searching range sequence T with an initial value as 0 km, a step length value as 5 km and a maximum value as 50 km, namely a space range of backscattering coefficients participating in calculation of a unit wind field, is established; all vectors in the set A are traversed according to an extraction result, and the scatterometer data are extracted; normalization processing is carried out on the sequence T, a step length value is 0.02, and T is obtained; the data set A is traversed to calculate windfield inversion errors, that is, for an n-th wind vector A<n>, the absolute errors of wind speed and a wind direction value in a corresponding sequence Bn and A<n> values are calculated, and normalization processing is carried out to obtain an error array e which is elements of a set (0, 1); and a scatter diagram of e and T is drawn, a curve is fitted, a minimum value is searched for along a 45-degree direction, and a corresponding sequence value thereof is an optimal searching 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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Login to View More IPC IPC(8): G06F17/30
CPCG06F16/2453Y02A90/10
Inventor 魏士俨杨晟
Owner THIRD INST OF OCEANOGRAPHY MINIST OF NATURAL RESOURCES