13th International Laser Ranging
"Toward Millimeter Accuracy"
Advanced Systems and Techniques (B.
Greene and T. Murphy)
|Millimeter Ranging Accuracy -- The Bottleneck
|SLR2000: Progress and Future Applications
|Optimization of the Correlation Range Receiver
Parameters in SLR2000
|Overview of Data for the SLR2000 Tracking
Mount Performance Testing
|Laser Tracking of Space Debris
|Installing TIGO in Concepcion
|The MLRO Project: a Status Report
|Photon-Counting Airborne Microlaser Altimeter
|Time Transfer by Laser Link
|A satellite laser ranging system based on
a micro-chip laser
This session gave us a glimpse at some of the laser ranging systems and
issues of the future. The presentations are summarized as follows:
- Ivan Prochazka presented ideas relating to the bottleneck in achieving
millimeter random error. The current state of the art appears to be
2-3 millimeters, though the obvious sources account for only about 1
millimeter. Possible contributors were outlined, including near vs.
far-field calibration differences, asymmetric up-link/down-link paths,
- John Degnan gave an overview of the SLR2000 system, which we visited
on Wednesday night, and found to be almost operational. Unique features
include a 2 kHz microchip eye-safe laser, interplanetary range capability,
and fully automated operation complete with "smart" weather
- John Degnan went on to describe a sophisticated, optimized search
algorithm for locating the return range signal in the low signal-to-noise
regime, largely based on optimized, iterative binning techniques. A
poster by Degnan demonstrated this technique in action as applied to
an airborne ranging instrument looking at the ground in daylight.
- Don Patterson presented the performance of the SLR2000 mount, showing
that the system meets its system specification of 1 arcsecond pointing
error at slew rates of 5 degrees per second.
- Ben Greene presented a laser ranging system capable of acquiring very
small non-cooperative targets, and operating in very hostile environments.
Initial tracking is underway, with future expansion supporting a large
cataloging effort expected in 2003.
- Stefan Riepl documented the testing, disassembly, and shipment of
the TIGO system to Chile. Here, the laser ranging capability joins a
wide variety of other geodetic instruments. The South American location
is very important to the global distribution of SLR stations.
- Giuseppe Bianco showed numerous results from the MLRO station, which
was undergoing final acceptance as he spoke. The system met all benchmark
goals, with outstanding SLR performance, in addition to lunar acquisition.
- Etienne Samain displayed a poster on the time transfer by laser link
(T2L2), citing an ultimate ability to stabilize ground clock performance
to 3 parts in 10^17 over ten days. This technique also has important
implications for interplanetary laser ranging.
- Hiroo Kunimari presented a poster on a microchip laser for SLR use.