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13th International Laser Ranging
Workshop
"Toward Millimeter Accuracy"
Submitted
Abstracts
Station Performance Evaluation (C. Luceri and R. Wood)
| Title | Primary Author |
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| The stability of the SLR stations coordinates determined from monthly arcs of LAGEOS-1 and LAGEOS-2 laser ranging in 1999-2001 | Stanislaw Schillak |
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Stanislaw Schillak Wnuk Edwin The determination of coordinates stability of the satellite laser ranging stations is one of the methods for control the quality of the laser ranging data. This work is continuation of the similar paper about coordinates stability of the all SLR stations in 1999 and 2000. The paper presents results of the coordinates stability determination for all SLR stations in the period 1999-2001 calculated in the ITRF2000 system on the basis of data provided by the LAGEOS-1 and LAGEOS-2 laser ranging. The calculations were performed with the usage of the GEODYN II program. Coordinates of the stations were determined from monthly arcs. Typical RMS of (O-C) values for the monthly orbital arcs was on a level of 1.7 cm. The final stability of the coordinates of SLR stations for all components varies from several millimeters to several centimeters. It was found real movement for two stations Tateyama in 2000 and Arequipa in 2001. Oral presentation; received July 31, 2002 |
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| MyStationPerformance.COM | Van Husson |
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HTSI P. Stevens, O. Brogdon, H. Vo There is a need for standardized, more comprehensive, easily accessible and current ILRS network performance feedback as the ILRS strives toward mm level reliability and accuracy. Currently, many ILRS sites have limited on-site data assessment capabilities. At some locations, system problems (e.g. equipment problems, data instability, large biases, insufficient data) linger for prolonged periods of time. Conflicting bias information from different analysis centers can also complicate and delay problem resolution. Our recommended solution to these challenges is the development of a new service, MyStationPerformance.COM . The key features of MyStationPerformance.COM will be:
The primary customer of this service will be the ILRS sites (i.e. operators and engineering support). Utilizing this service, sites can expedite the diagnosis of their performance problems, thereby facilitating a rapid resolution and return to acceptable performance. The ILRS analyst community can also use these site assessment tools to aid in the quick identification of station performance problems. If effectively used, MyStationPerformance.COM will enable the transition of data quality control from the analysts to the individual stations. Oral presentation; received August 20, 2002 |
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| Results of the triple laser ranging collocation experiment at the Grasse observatory, France (September - November 2001) | Joëlle Nicolas |
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Observatoire de la Côte d'Azur/CERGA P. Bonnefond, O. Laurain, P. Exertier, and F. Barlier At the Grasse observatory, France, we have the opportunity to have three independent laser ranging stations very close one to each other (about 20 m): a Satellite Laser Ranging (SLR) station, a Lunar Laser Ranging (LLR) station, and the French Transportable Laser Ranging Station (FTLRS). We used this unique configuration to perform a collocation experiment between these three stations from September to November 2001. This experiment was first performed to qualify the new performances of the FTLRS after a long phase of great improvements and before its departure to Corsica for the oceanographic satellite JASON-1 (2001) calibration and validation campaign during the first six-month of 2002. But furthermore, we used this unique configuration to estimate and compare instrumental bias for each station. Herein, we present the main results on the SLR, the LLR and the FTLRS stations obtained with the analysis of this collocation experiment. One of the main results is the validation at the millimetric level for the performances of the FTLRS in its new configuration. Moreover, our analysis shows the consistency at the level of few millimeters between the three laser stations of the OCA, result which demonstrates the strength of the SLR technique. Another important result is the confirmation of a systematical error of 2 cm on TOPEX/POSEIDON laser mean residuals for some European stations such as Grasse and Herstmonceux stations. Oral presentation; received August 21, 2002 |
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| Status of the KACST SLR Program – Past, Present and Future | Turki Al-Saud |
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Space Research Institute Overview of King Abdulaziz City for Science and Technology (KACST) and Space Research Institute (SRI), and how laser ranging fits the charter, in addition to the important role of Saudi Arabia in the global network. SALRO has realized its re-commission process, is now gearing up to run two operations shifts on a permanent basis. Increasing emphasis is being placed on regular data productivity. Planning is underway to install a purpose-built active aircraft detection system. Graphics are presented to show performance over the last few years. Central to its science charter, KACST will further expand applications through cooperation with the scientific communities within the Kingdom, to include such studies as:
Oral presentation; received August 22, 2002 |
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| Range Bias vs Applied System Delay | Toshimichi Otsubo |
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Takako Genba Having attained the millimetre-level precision (1-2 mm for normal point, 4-6 mm for single shot), we now have to pay more attentions to the accuracy of laser ranging data. At CRL, weekly reports of 7-satellite residual analysis, producing pass-by-pass range bias and time bias, have been distributed to the ILRS community for 3 years. The post-fit residuals are also useful to check the data accuracy when they are sorted by associated data such as the number of returns per bin [Otsubo, Matera workshop, 2000]. We newly found it useful to choose the applied system delay as a sorting parameter. That is, it is possible to detect potential problems in ranging to terrestrial targets or in subtracting system delay from raw range data. The actual analysis results using recent one year's data of LAGEOS, AJISAI and STARLETTE will be presented. Oral presentation; received August 22, 2002 |
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| Absolute and Relative Range Bias Detection Capabilities | Van Husson |
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HTSI The computed orbit is the final yardstick in accessing ILRS data quality. The absolute accuracy of orbit determination depends ultimately on the quality and quantity of data, but is a trailing (not leading) indicator of 'true' network performance. In order to keep pace and to monitor improvements is laser ranging technology, analysis techniques continually need to be enhanced. This is mandatory for the ILRS is to achieve its vision of mm level accuracy. Orbital analysis techniques (i.e. collocation, short arc, long arc) have their own inherent strength and weaknesses and will be characterized in terms of absolute and relative range bias detection capabilities. Some new bias detection techniques will be explored and evaluated. Oral paper; received August 23, 2002 |
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| The precise data processing in MCC Analysis Center | Vladimir Glotov |
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Mission Control Center V. Mitrikas, S. Revnivykh, M. Zinkovsky SLR data Analysis Center is a part of the MCC Navigation and Coordinate-time Service. MCC has certain technical capabilities and its own software for the precise navigation and SLR data processing, the monitoring of the GLONASS and GPS signals performance. The MCC Navigation and Coordinate-time Service works continuously in real-time mode. The products are available from MCC:
The report contain the analysis of the technical and software capabilities and available precise products of the MCC Navigation and Coordinate-time Service. Oral presentation; received August 22, 2002 |
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Last Updated:
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