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Pdfs/Instrument.Pdf, University of Central Florida STARS Electronic Theses and Dissertations, 2004-2019 2009 Simulation Of Brightness Temperatures For The Microwave Radiometer On The Aquarius/sac-d Mission. Salman Khan University of Central Florida Part of the Electrical and Electronics Commons Find similar works at: https://stars.library.ucf.edu/etd University of Central Florida Libraries http://library.ucf.edu This Masters Thesis (Open Access) is brought to you for free and open access by STARS. It has been accepted for inclusion in Electronic Theses and Dissertations, 2004-2019 by an authorized administrator of STARS. For more information, please contact [email protected]. STARS Citation Khan, Salman, "Simulation Of Brightness Temperatures For The Microwave Radiometer On The Aquarius/ sac-d Mission." (2009). Electronic Theses and Dissertations, 2004-2019. 4177. https://stars.library.ucf.edu/etd/4177 SIMULATION OF BRIGHTNESS TEMPERATURES FOR THE MICROWAVE RADIOMETER ON THE AQUARIUS/SAC-D MISSION by SALMAN SAEED KHAN B.S. National University of Computer & Emerging Sciences, 2004 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in the School of Electrical Engineering & Computer Science in the College of Engineering and Computer Science at the University of Central Florida Orlando, Florida Summer Term 2009 ABSTRACT Microwave radiometers are highly sensitive receivers capable of measuring low levels of natural blackbody microwave emissions. Remote sensing by satellite microwave radiometers flying on low-earth, polar orbiting, satellites can infer a variety of terrestrial and atmospheric geophysical parameters for scientific and operational applications, such as weather and climate prediction. The objective of this thesis is to provide realistic simulated ocean brightness temperatures for the 3-channel Microwave Radiometer (MWR), which will be launched in May 2010 on the joint NASA/CONAE Aquarius/SAC-D Mission. These data will be used for pre-launch geophysical retrieval algorithms development and validation testing. Analyses are performed to evaluate the proposed MWR measurement geometry and verify the requirements for spatial/temporal sampling. Finally, a preliminary study is performed for the post-launch inter-satellite radiometric calibration using the WindSat polarimetric radiometer on the Coriolis satellite. ii Dedicated to my beloved father, Professor Ahmad Saeed Khan (1935-2009). The setting sun sinks at the horizon, Its weakening glow is not meant to die, It is merely an end to a day well spent, It is merely an end to a life well lived, For some it is the start of a lonesome night, It is only true „cause they can‟t see the light, Alas my friends, if only you could comprehend, Every sunset is a sunrise at the end. Yours as always, Salman. iii ACKNOWLEDGMENTS I would like to thank Dr. W. Linwood Jones for offering me an opportunity to work in the Central Florida Remote Sensing Lab (CFRSL) under his guidance. It has improved my skills in a multitude of areas. The CFRSL family has also been very supportive and cooperative; they have made me feel at home since I joined in October 2008. I would like to thank all the lab members for their support, but specifically, I would like to mention that my colleague and now a good friend of mine, Mr. Spencer Farrar, has put a lot of energy in helping me with my thesis and I can safely say that without his assistance it would have been a very difficult task; I thank you for your help. I would also like to thank my committee members for their guidance, specifically, Sergio for his valuable input during his spring visit to CFRSL and Mr. Johnson for his time and the kind words he had for me when my father passed away. All my friends in Orlando, specifically, Azer, Nazim, Sami, Kamran & Ali, I will never forget your support when I was facing the toughest time of my life with the sad demise of my beloved father. Finally, I would express my love to my precious mother; I love you more than the world and it is only because of your love and prayers that I have been achieving whatever I aim for, and my brother who has shown that he is a strong man, just like dad was; I thank you for your support and I love my niece, nephew, and my sister Kishu. I would also wish to acknowledge that the CFRSL is a university partner with Analytical Graphics Inc. and that the use of Satellite Tool Kit in this thesis was for educational purposes only. iv TABLE OF CONTENTS LIST OF FIGURES ....................................................................................................................... vi LIST OF TABLES ....................................................................................................................... viii LIST OF ACRONYMS/ABBREVIATIONS ................................................................................ ix CHAPTER 1.INTRODUCTION .................................................................................................... 1 CHAPTER 2. SATELLITES AND INSTRUMENTS ................................................................... 5 2.1 Aquarius/SAC-D ................................................................................................................... 5 2.1.1 Aquarius Instrument....................................................................................................... 8 2.1.2 Microwave Radiometer (MWR) .................................................................................. 11 2.1.3 Yaw Steering ................................................................................................................ 17 2.2 Coriolis/WindSat................................................................................................................. 19 2.3 Inter-Satellite Relative Orbital Periods ............................................................................... 25 2.4 Inter-Satellite Radiometric Spatial/Temporal Collocations ................................................ 28 CHAPTER 3. SIMULATED MICROWAVE RADIOMETER DATASET ................................ 30 3.1 MWR Tb Simulation Requirements ................................................................................... 31 3.2 WindSat IDR ....................................................................................................................... 38 3.3 MWR Footprint Analysis .................................................................................................... 44 3.4 Normalization of WindSat Brightness Temperatures to MWR Incidence Angles ............. 51 3.4.1 Adjustments for Incidence Angle ................................................................................ 52 3.4.2 Dependence on Environmental Parameters ................................................................. 64 CHAPTER 4. RESULTS AND VALIDATION .......................................................................... 77 4.1 Spatial/Temporal Validation ............................................................................................... 77 4.2 Radiometric Validation ....................................................................................................... 81 4.3 Yaw Steering Results .......................................................................................................... 83 CHAPTER 5. CONCLUSIONS & FUTURE WORK ................................................................. 99 APPENDIX A CONICAL SCANNING GEOMETRY ............................................................. 103 APPENDIX B RADIATIVE TRANSFER THEORY ................................................................ 108 APPENDIX C MATLAB SCRIPT ............................................................................................. 113 LIST OF REFERENCES ............................................................................................................ 167 v LIST OF FIGURES Figure 1: Annual ocean mean salinity with colorbar in practical salinity units (PSS) [4]. ............. 7 Figure 2: Aquarius/SAC-D Satellite Mission [5]............................................................................ 8 Figure 3: Aquarius Instrument Configuration [9]. .......................................................................... 9 Figure 4: Aquarius Beam Pointing [6]. ......................................................................................... 10 Figure 5: MWR Instrument Configuration [5]. ............................................................................. 12 Figure 6: MWR Forward Beam (Ka-Band) Geometry [10]. ........................................................ 13 Figure 7: MWR Beam Geometry & Swath Overlap [11]. ............................................................ 14 Figure 8: Target Footprints of Forward Looking (Ka-Band) Beams [10]. ................................... 15 Figure 9: MWR Swath Coverage per Beam [10].......................................................................... 16 Figure 10: Timing Diagram [10]................................................................................................... 17 Figure 11: Aquarius/SAC-D yaw steering (left panel) and without yaw steering (right panel). .. 18 Figure 12: WindSat Mechanical Configuration [12]. ................................................................... 20 Figure 13: WindSat Feed-bench with multi-frequency/polarization horns [2]. ............................ 21 Figure 14: WindSat Earth Projected Beams for multiple antenna scans [2]. ................................ 22 Figure 15: WindSat Geometry & Pointing Angles
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