(ATBD) SMAP Level 1 Radar Data Products - NASA

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62 14 Acronym List BFPQ CTU DEM EASE FFT FIR FM FPGA GNSS GPS GSFC HDF IF JPL NAIF NASA NOAA NRC NRCS PRF PRI RF RFI SAR SCH SMAP SPECAN SPICE SRTM STALO STT USGS Block Floating Point Quantizer Control and Timing Unit Digital Elevation Model Equal Area Scalable Earth Fast Fourier Transform Finite Impulse Response Frequency Modulated Field Programmable Gate Array Global Navigation Satellite System Global Positioning System Goddard Space Flight Center Hierarchical Data Format Intermediate Frequency Jet Propulsion Laboratory Navigation and Ancillary Information Facility National Aeronautics and Space Administration National Oceanographic and Atmospheric Administration National Research Council Normalized Radar Cross Section Pulse Repetition Frequency Pulse Repetition Interval Radio Frequency Radio Frequency Interference Synthetic Aperture Radar along track, cross track, height coordinates Soil Moisture Active Passive - Mission name Spectral Analysis Files used by the NAIF toolkit Shuttle Radar Topography Mission Stable Local Oscillator Slow Time Threshold United Stated Geological Survey
63 References [1] National Research Council, “Earth Science and Applications from Space: National Imperatives for the Next Decade and Beyond,” pp. 400, 2007. [2] D. Entekhabi et al., “The Hydrosphere State (HYDROS) mission concept: An earth system pathfinder for global mapping of soil moisture and land freeze/thaw,” IEEE Trans. Geosci. Remote Sens., vol 42, no. 10, pp. 2184-2195, Oct 2004. [3] D. Entekhabi et al., “The Soil Moisture Active Passive (SMAP) Mission,” Proceedings of the IEEE, vol 98, no. 5, pp. 704-716, May 2010. [4] E. Podest, “SMAP Ancillary Data Report: Digital Elevation Model,” JPL D- 53056, 2011. [5] S. Hensley et al., “Jurassicprok A Dual Frequency Radar Interferometric Processor Developed for the GeoSAR Program,” Algorithm Description Document, March 2003, JPL/CalTech. [6] M. Spencer et al., “High-Resolution Measurements With a Spaceborne Pencil- Beam Scatterometer Using Combined Range/Doppler Discrimination Techniques,” IEEE Trans. on Geo. and Remote Sens., vol 41, no. 3, pp. 567-581, 2003. [7] S. Chan and M. Spencer, “Soil Moisture Active Passive (SMAP) Project: Radar Error Budget,” JPL-D-61622, April 20, 2011. [8] F. Ulaby et al., Microwave Remote Sensing, Vol II, Addison-Wesley Publishing Co, 1982. [9] R. Kwok and W.T.K. Johnson, “Block Adaptive Quantization of Magellan SAR Data,” IEEE Trans. on Geo. and Remote Sens., vol 27, no. 4, pp. 375-383, 1989. [10] M. Spencer et al., “Improved Resolution Backscatter Measurements with the SeaWinds Pencil-Beam Scatterometer,” IEEE Trans. on Geo. and Remote Sens., vol 38, no. 1, pp. 89-104, 2000. [11] M. Shimada, “Long term stability of L-band normalized radar cross-section of Amazon rainforest using the JERS-1 SAR,” Can. J. Remote Sensing, Vol 31, No. 1, pp. 132-137, 2005. [12] J. Curlander and R. McDonough, Synthetic Aperture Radar, John Wiley and Sons, Inc, 1991.
Page 1 and 2:
Soil Moisture Active Passive (SMAP)
Page 3 and 4:
Algorithm Theoretical Basis Documen
Page 5 and 6:
i Contents 1 Introduction 1 2 Missi
Page 7 and 8:
1 1 Introduction This document desc
Page 9 and 10:
3 Table 1: SMAP Mission Requirement
Page 11 and 12:
Table 2: SMAP Data Products Table 5
Page 13 and 14:
7 Table 3: Requirements applicable
Page 15 and 16:
Figure 2: Flow of data in the SMAP
Page 17 and 18: 11 divided into two groups, a gener
Page 19 and 20: 13 positions in a half-orbit), and
Page 21 and 22: 15 Table 6: L1B antenna scan qualit
Page 23 and 24: 17 Table 10: L1C cell mode bit flag
Page 25 and 26: 19 the spacecraft velocity vector w
Page 27 and 28: Figure 4: Overlapping conical scans
Page 29 and 30: 23 hang out by 500 m thus broadenin
Page 31 and 32: 25 τ pri = n 1 f stalo (8) τ p =
Page 33 and 34: 27 and R(t) indicates that the rang
Page 35 and 36: Figure 7: Schematic view of the nad
Page 37 and 38: 31 from about 400 m in the side loo
Page 39 and 40: 33 cross-section is estimated from
Page 41 and 42: 35 Figure 8: L1C Processing flow di
Page 43 and 44: 37 adpative floating point quantize
Page 45 and 46: 39 7.7 Azimuth Compression The coni
Page 47 and 48: 41 Figure 12: Processed image (azim
Page 49 and 50: 43 8 L1B Processing Algorithms Low
Page 51 and 52: 45 9.1 Antenna Gain Pattern Knowled
Page 53 and 54: Figure 15: Plot of the total number
Page 55 and 56: 49 For SAR processing, the real ape
Page 57 and 58: 51 as the loop back measurement per
Page 59 and 60: 53 have been removed, there can sti
Page 61 and 62: 55 11 RFI RFI signals are expected
Page 63 and 64: 57 11.2.1 Backlobe Contamination GN
Page 65 and 66: 59 12.1 Pre-Launch Before launch, v
Page 67: 61 12.2.2 Radiometric Accuracy Vali
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(ATBD) SMAP Level 1 Radar Data Products - NASA

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