Developing Responsive and Agile Space Systems - Space-Library

R. Russel et al., “GRB 071003: Broadband Follow-Up Observations of
a Very Bright Gamma-Ray Burst in a Galactic Halo,” Astrophysical
Journal, Vol. 688, No. 1, pp. 470–490 (Nov. 2008).
J. N. Schulman et al., “Scaling of High-Performance InAs/AlSb/GaSb
Heterostructure Detectors for Millimeter-Wave and Submillimeter-
Wave Sensing and Imaging,” 2008 66th Annual Device Research Conference,
pp. 123–124 (Piscataway, NJ, 2008).
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Photonic Front End,” 2008 International Topical Meeting on Microwave
Photonics (MWP 2008) jointly held with the 2008 Asia-Pacific
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High Power Multi-Mode InGaAs Strained Quantum Well Lasers,”
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Patents
D. A. Ksienski, J. P. McKay, S. S. Osofsky, K. S. MacGowan, and
G. M. Shaw, “Higher-Order Intermodulation Reduction Using
Phase and Angle Smearing,” U.S. Patent No. 7,420,508, Sept.
2008.
Multiple, simultaneous antenna beams required in communication
systems are often achieved using active phased arrays. A
common problem encountered in these systems is the generation
of intermodulation product beams due to nonlinear effects. This
patent describes a method for reducing intermodulation beams.
It starts by identifying one or more higher-order intermodulation
beams that need to be reduced and determining acceptable degradations
for the fundamental beams associated with them. Next,
phase and angle beam-smearing parameters are identified that
would reduce the intermodulation beams with acceptable degradation
to the fundamental beams. These parameters are then used
to apply a beam-smearing phase distribution to an array along
with a beam-steering distribution. This invention can be used for
satellite antenna arrays or any application that generates multiple
simultaneous beams in the presence of nonlinear effects.
H. S. Hou, “Merge and Split Discrete Cosine Block Transform
Method,” U.S. Patent No. 7,437,394, Oct. 2008.
Fast transform methods for the compression and decompression
of data entail separating and combining data blocks in the transform
domain and inversely transforming them back to the spatial
or temporal domain. In the process, however, the quality of the
transformed data is degraded. This invention is aimed at decreasing
the degradation caused by the fast forward process. Input
data in the temporal or spatial domain during either the split or
merge radix-2 forward processing step first undergoes transform
processing followed by combinational processing. In the split
transform process, whole transformed data are split into two
halves using combinational processing in the transform domain.
In the merge transform process, these two halves are merged
using combinational processing in the transform domain. The
Crosslink Summer 2009 • 47