Engineering topics
Shaffer, S.
Publications and source records attributed to Shaffer, S..
New Directions and Studies for a US Spaceborne SAR Mission
No abstract available
Interferometric aligment of the X-SAR antenna system on the space shuttle radar topography mission
The on-orbit alignment of the antenna beams of both the X-band and C-band radar systems during operations of the shuttle radar topography mission/X-band synthetic aperture radar (SRTM/X-SAR)was a key requirement for achieving best interferometric performance.
RF characterization of the Mars Exploration Rover radar altimeter antennas-airbag interaction
This paper presents the experimental results of the Mars Exploration Rover-03 (MER) radar altimeter antennas-airbag interaction.
RF characterization of the Mars Exploration Rover radar altimeter antennas-airbag interaction
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A Continental Scale Mosaic of the Amazon Basin Using JERS-1
In the paper, a methodology, example, and accuracy assessment are given for a continental scale mosaic of the Amazon River basin at 100 m resolution using the JERS-1 satellite.
Metrology, Attitude, and Orbit Determination for Spaceborne Interferometric Synthetic Aperture Radar (IFSARK)
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Metrology, Attitude, and Orbit Determination for Spaceborne Interferometric Synthetic Aperture Radar
The Shuttle Radar Topography Mission (SRTM), scheduled for a 10 day Space Shuttle flight in 1999, will use an Interferometric Synthetic Aperture Radar (IFSAR) instrument to produce a near-global digital elevation map of the earth's land surface with 16 m absolute vertical height accuracy at 30 meter postings.
SIR-C Pattern Prediction, Health Check, and Verification
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Calibration of SIR-C Data Products
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Automatic DEM Generation Using Magellan Stereo Data
The Magellan radar instrument collected a large volume of radar stereo images during its two years of operation. In order to make full use of this data an automatic means of generating digital elevation models is required. Because of Magellan's unique orbital geometry and radar image formation algorithm a number of modifications to the standard stereo processing scheme are required. This paper outlines a stereo algorithm suitable for Magellan data.
First Results from SIR-C Calibration
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Using Repeat Track Interferometry to Estimate Small Scale Surface Changes on Venus
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Automatic DEM Generation Using Magellan Radar Stereo Data
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Magellan Recorder Data Recovery Algorithms
This paper describes algorithms implemented by the Magellan High Rate Processor to recover radar data corrupted by the failure of an onboard tape recorder that dropped bits. For data with error correction coding, an algorithm was developed that decodes data in the presence of bit errors and missing bits.
Development of a calibration workstation for SIR-C
The paper describes the status of a comprehensive synthetic aperture radar (SAR) software package developed specifically to aid the calibration of a multifrequency and multipolarization radar like the Shuttle Imaging Radar, SIR-C. The primary data types processed are engineering telemetry, point targets (corner reflectors and polarimetric active radar calibrators), distributed targets (clutter), tone-generators, and ground receivers. The parameters derived to aid the calibration of the production processor include measurements of relative radiometric channel to channel imbalance, absolute calibration constants, antenna pattern corrections, noise levels, polarimetric cross-talk, and geometric offsets. The software reports standard performance measurements such as resolution, peak and integrated sidelobes, radiometric response accuracy, and geometrical distortions such as scale errors, position bias and standard deviation, and image skew. Furthermore, the inclusion of software to allow updates of the shuttle-state vector (position and velocity) is considered.