Operational method for the restoration of atmospheric humidity profiles according to the ground-based microwave spectrometer in the range of 18.0 - 27.2 GHz

 

D. M. Ermakov ¹, V. P. Savorskiy ¹, M. V. Danilychev ², B. G. Kutuza ², O. Yu. Panova ¹, M. T. Smirnov ¹, A. P. Chernushich ¹

 

¹ Fryazino Branch of Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Vvedensky Sq.1, Fryazino Moscow region 141190, Russia

² Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Mokhovaya 11-7, Moscow 125009, Russia

 

The paper is received on November 20, 2018

 

Abstract. A method for analyzing the previously obtained long series of round-the-clock measurements of the radio-thermal continuous spectrum of the atmosphere from the Earth's surface in the MW range of 18 - 27.2 GHz, aiming at restoration of vertical humidity profiles, was proposed and implemented. One of the main goals of the work was to enable the operational application of the established methodology for processing experimental data in real time. This opens up the prospect of informational support of remote users with both current and archival data on the state of the atmosphere (its temperature and humidity profiles). For this purpose, a variation of the method of successive approximations based on the Levenberg-Marquardt algorithm has been used. This algorithm offers a variant of the regularization of the solution obtained by the gradient descent method, without using a-priori statistical information about the natural variability and correlation of atmospheric parameters (as opposed to the statistical regularization method). The paper describes the Levenberg-Marquardt algorithm in the context of the problem of retrieving the atmospheric humidity profile and provides a general flowchart of experimental data processing. The overall software implementation makes it possible to achieve a processing speed exceeding the data accumulation rate (units of seconds per one experimental radiothermal spectrum). Trial processing of data of field measurements of the atmospheric radiothermal spectrum under various observation conditions was carried out. Analysis of the results showed the possibility of retrieving atmospheric humidity profiles from the available experimental data. At the next stage of the work, mass processing of the accumulated experimental data and comparison of the results with independent measurements (first of all, radiosonde) are planned.

Key words: MW spectrometer, continuous spectrum, atmospheric profile, humidity, restoration.

References

1.    Kutuza B.G., Danilychev M.V., Yakovlev O.I. Sputnikovyi monitoring Zemli: mikrovolnovaya radiometriya atmosfery i poverkhnosti [Satellite Earth Monitoring: Microwave Atmosphere and Surface Radiometry] Ìoscow, LENANAD Publ., 2016, 336 p. (In Russian)

2.    Danilychev M.V., Ermakov D.M., Kutuza B.G., Savorskiy V.P. Multibeam systems as part of the onboard microwave radiometric complex. Fizicheskie osnovy priborostroeniya - Physical Basics of Instrumentation. 2018. Vol. 7. No. 1(27). pp. 37-45. (In Russian)

3.    Levenberg K. A method for the solution of certain non-linear problems in least squares.  Quarterly of Applied Mathematics. 1944. Vol. 2. pp. 164–168.

4.    Marquardt D. An algorithm for least-squares estimation of nonlinear parameters.  SIAM Journal of Appllied Mathematics. 1963. Vol. 11. No.  2. pp. 431–441.

5.    ARTS. The Atmospheric Radiative Transfer Simulator [online resource]. Available at http://radiativetransfer.org/

 

For citation:
D. M. Ermakov, V. P. Savorskiy, M. V. Danilychev, B. G. Kutuza, O. Yu. Panova, M. T. Smirnov, A. P. Chernushich. Operational method for the restoration of atmospheric humidity profiles according to the ground-based microwave spectrometer in the range of 18.0 - 27.2 GHz. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 12. Available at http://jre.cplire.ru/jre/dec18/2/text.pdf

DOI  10.30898/1684-1719.2018.12.2