ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 2, pp. 92-102

Methodological issues of data processing from passive microwave radiometer at L-band on the MKA FKI No.1

M.T. Smirnov1 , D.M. Ermakov1 
1 Fryazino Dept. of V.A. Kotelnikov Institute of Radioengineering and Electronics RAS, Fryazino, Russia
The experiment on passive microwave remote sensing in L range was carried out by means of specially developed scientific equipment "Zond -PP" installed on the small spacecraft MKA, FKI No. 1. The paper discusses methodological issues of processing the information received, mainly in terms of accounting instrumental factors. Analysis of the measurements showed that external interference play a considerable role, but not critical. Along with external interference from active radio sources having local character, sometimes long, regular enough and smooth changes were observed in the measured signals. Based on statistical analysis of a number of sessions, a linear correction function was chosen, which allows to shift the measurement results in the second channel, so that in homogeneous domains signal difference from both channels was minimal in each of the sessions. To assess the validity of the data and test the quality of calibration performed using the "Zond -PP", the results were compared with the results of the European project SMOS measurements. The comparison showed their good agreement. Peculiarities of data processing for retrieving salinity of oceans are discussed. Solving the task to a high accuracy is possible only via statistical averaging of estimates in individual pixels. It is possible, that, given the implemented spatial resolution of the device and high sampling rate, however, in the case of unstable operation of the device, such averaging may become incorrect under certain conditions. Possibilities of joint processing of synchronous optical images and microwave radiometric measurements are considered.
Keywords: Passive microwave radiometric measurements, remote sensing of the Earth
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