JUSTIFICATION FOR OPTIMIZATION OF OPERATION OF NOISE TEMPERATURE ESTIMATES DIVISION AT THE ADJACENT OBSERVATION INTERVALS IN A RADIOMETER WITH AN UNSTABLE AMPLIFICATION FACTOR
DOI:
https://doi.org/10.26906/SUNZ.2018.1.059Keywords:
modulation radiometer, amplifying factor, noise temperature estimate, method of Maximum Likelihood Estimations, signal processing, noise temperature estimationAbstract
In the article an optimization of operation of noise temperature estimates division at the adjacent observation intervals in a radiometer with an unstable amplification factor was justified. The separate optimization problem of statistical estimates of random processes noise temperatures observed on two contiguous time intervals of equal length with opened and closed input of an unstable amplification factor modulation radiometer was solved using the method of Maximum Likelihood Estimations. It was shown, that one of the significant operations of the synthesized primary signal processing algorithm is the division operation of the signals average powers estimates, changed on the adjacent time intervals. The analytical margin of errors expressions for noise temperature estimates of investigated source and amplification factor instability were derived. These margins of errors are dependent on observation time, width of input working frequencies, signal to noise ratio and amplification factor instability. The obtained signal processing algorithm is reasonable to use in radiometers, pre-detector paths of which contain rather cheap low-stable amplifiers.Downloads
References
Alimenti F. A space-based 90 GHz radiometer for the observation of solar flares: Feasibility study / F. Alimenti et al. // 2009 European Microwave Conference (EuMC). – Rome, 2009. – P. 982-985. doi: 10.23919/EUMC.2009.5296238.
Peng J. Soil Moisture Active/Passive L-Band Microwave Radiometer Postlaunch Calibration / J. Peng et al. // IEEE Transactions on Geoscience and Remote Sensing. – Sept. 2017. – Vol. 55(9). – P. 5339-5354. doi: 10.1109/TGRS.2017.2705342.
Microwave Scanner-Sounder MTVZA-GY on New Russian Meteorological Satellite Meteor-M No. 2: Modeling, Calibration, and Measurements / L.M. Mitnik, V.P. Kuleshov, M.L. Mitnik, A.M. Streltsov, G.M. Chernyavsky and I.V. Cherny // IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. – July 2017. – Vol. 10(7). – P. 3036-3045. doi: 10.1109/JSTARS.2017.2695224.
Microwave Radar and Radiometric Remote Sensing / F.T. Ulaby and D.G. Long // Michigan, University of Michigan Press. Ann Arbor, 2014. – P. 262-293.
Moon N.W. and Kim Y.H. Temperature Drift Compensation Using Multiple Linear Regression for a W-Band Total Power Radiometer / N.W. Moon and Y.H. Kim // IEEE Sensors Journal. 2015. – Vol. 15(8). – P. 4612-4620.
Филатов А.В. Новые принципы построения высокочувствительного микроволнового радиометра нулевого типа с многоканальным приемником / А.В. Филатов // Физические основы приборостроения, 2017. – №6, 2(24). – С. 67-75. doi: 10.25210/jfop-1702-067075.
Kemppainen S. Thermal stabilized front-end PCB with active cold calibration load for L-band radiometer / S. Kemppainen et al. // 2007 IEEE International Geoscience and Remote Sensing Symposium. – Barcelona, 2017. – P. 4433-4436. doi: 10.1109/IGARSS.2007.4423838.
Dicke R.H. The measurement of thermal radiation at microwave frequencies / R.H. Dicke // Rev. Sci. Instrum., July 1946. – Vol. 17(7). – P. 268-275.
Pavlikov V.V. The New Type of Chopper Radiometer / V. V. Pavlikov, A. D. Sobkolov // Ultrawideband and Ultrashort Impulse Signals. (UWBUSIS 2016) : proc. 8th Intern. conf., 5-11 Sept., 2016, Odesa, Ukraine. – Kharkov, 2016. – P. 205−208. doi: 10.1109/UWBUSIS.2016.7724189
Statistical Synthesis of Chopper Radiometric Systems / V.K. Volosyuk, V.F. Kravchenko, V.V. Pavlikov, V.I. Pustovoit // Doklady Physics. – 2013. – Vol. 58, № 1. – P. 29–32.
Pavlikov V.V. Radiometer with signal energies ratio / V.V. Pavlikov, S.S. Zhyla, A.V. Odokienko, M.O. Antonov // IEEE Radar Methods and Systems Workshop. (RMSW 2016) : proc. Intern. conf., 27-28 Sept., 2016, Kyiv, Ukraine. – Kyiv. – P. 99−102. doi: 10.1109/RMSW.2016.7778560
Development of Digital Part of Ratio-Type Radiometer / V.V. Pavlikov, A.V. Odokiyenko, A.V. Sobkolov, K.N. Nezhalskaya, M.O. Antonov // The Experience of Designing and Application of CAD Systems in Microelectronics. CADSM’2017: proc. 14th Int. conf., 2017. – P. 122-124. doi: 10.1109/CADSM.2017.7916100.
