Antenna pattern correction for microwave radiometry utilizing a priori knowledge based on projection onto convex sets method

Teramoto, Koji; Arai, Kohei; Imatani, T.

doi:10.1109/igarss.1995.521181

1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Application

DOI: 10.1109/igarss.1995.521181

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Antenna pattern correction for microwave radiometry utilizing a priori knowledge based on projection onto convex sets method

Koji Teramoto

Kohei Arai

T. Imatani

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“…Other approaches, as in [14] and [15], are focused on the effects due to the antenna pattern, or to its changes in space, not exactly known. The retrieval process that theoretically involves the solution of an integral equation is performed by means of a discretized formulation of the apparent temperature with the addition of a priori knowledge about the scenario temperature distribution to minimize the error in the inversion.…”

mentioning

confidence: 99%

Preliminary Studies on CIMR Antenna Pattern Brightness Temperature Compensation

Brogioni

Bosisio

Lapini

et al. 2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Spaceborne microwave radiometry provides an essential contribution to monitoring the Earth with varying spatial resolution both related to the reflector dimension and the frequency of operation. The ESA's Copernicus imaging microwave radiometer (CIMR) mission aims at collecting the geophysical observables at a spatial resolution ranging from 60 km in L band to 4 km in Ka band. This goal can be achieved by equipping CIMR with a large unfurlable mesh reflector antenna. A limitation of the antenna design is that the antenna pattern includes grating lobes that contaminate the scene measurement with contributions originated far from the nominal footprint. This effect introduces inaccuracies in brightness temperature measurements, particularly when facing radiometric discontinuities, e.g., near the coastlines and sea ice edges, which can be greater than the mission required maximum of 0.5 K. The aim of this article is to assess a technique which will be able to correct the effects of antenna pattern and obtain reliable T B measurements. The analyzed simple technique is based on a regularized deconvolution of the antenna pattern to reconstruct the actual brightness temperatures. The technique was tested over a synthetic scenario that mimics both steep and smooth variations in spatial and thermal domains.

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mentioning

confidence: 99%

Preliminary Studies on CIMR Antenna Pattern Brightness Temperature Compensation

Brogioni

Bosisio

Lapini

et al. 2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Improved Satellite Ground Resolution for Sea-Ice Observation Using an Inversion Method and A Priori Information

Sasaki

Teramoto

2006

IEEE J. Oceanic Eng.

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Comparative Study of Optimization Methods for Estimation of Sea Surface Temperature and Ocean Wind with Microwave Radiometer Data

Arai¹

2016

ijarai

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Abstract-Comparative study of optimization methods for estimation sea surface temperature and ocean wind with microwave radiometer data is conducted. The well known mesh method (Grid Search Method: GSM), regressive method, and simulated annealing method are compared. Surface emissivity is estimated with the simulated annealing and compared to the well known Thomas T. Wilheit model based emissivity. On the other hand, brightness temperature of microwave radiometer as a function of observation angle is estimated by the simulated annealing method and compares it to the actual microwave radiometer data. Also, simultaneous estimation of sea surface temperature and ocean wind speed is carried out by the simulated annealing and compared it to the estimated those by the GSM method. The experimental results show the simulated annealing which allows estimation of global optimum is superior to the other method in some extent.

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Antenna pattern correction for microwave radiometry utilizing a priori knowledge based on projection onto convex sets method

Cited by 3 publications

References 1 publication

Preliminary Studies on CIMR Antenna Pattern Brightness Temperature Compensation

Preliminary Studies on CIMR Antenna Pattern Brightness Temperature Compensation

Improved Satellite Ground Resolution for Sea-Ice Observation Using an Inversion Method and A Priori Information

Comparative Study of Optimization Methods for Estimation of Sea Surface Temperature and Ocean Wind with Microwave Radiometer Data

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