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1、1ILRS WorkshopKtzting, Germany October 28 - 31, 2003Recommendations and Action ItemsDaylight RangingStations must place greater stress on daylight ranging for provide better day-night data distribution.The CB and the Networks and Engineering Working Group will work with stations that can do daylight
2、 mount modeling to make information available about how this capability can be achieved.Predictions HTSI should implement the repair to its IRV tuning process to correct the midnight offset problem. The CB will ask GFZ if they can speed up the prediction cycle for CHAMP and GRACE to improve data acq
3、uisition.The CB will remind ESOC of the offset issue and see if we can offer them any help.Data ThroughputThe stations, data centers and the prediction centers must reduce the data - prediction update cycle time as much as possible.Stations should strive for data submissions after every pass, especi
4、ally on the low, harder to track satellites such as CHAMP, GRACE, GFO-1, ERS-2, and EnvisatData Centers should strive for 10-minute turnaround times.Dynamic PrioritiesCB will post the new dynamic priority table with daily updated indices on the AIUB server, so it will be available when stations acce
5、ss their prediction updatesOn site Data Consistency ChecksStations must implement procedures for onsite monitoring of the consistency of their pass-by-pass calibrations, meteorology readings, and systems health-parameters. Time histories of key parameters should be used to reveal performance issues.
6、 RGO will upgrade its NP check program for easy implementation and make it available for other stations to use in local data screeningVan Husson will also provide a set of tests for the stations to use to help identify data problems.Minimum Data Criteria for Normal Points Stations may exercise their
7、 own discretion in setting minimum data criteria per normal point or disregard them all together. The GB recommends the 2002 criteria (6 data points per NP in daylight and 3 data points per NP at night) for single photoelectrons systems with high data yield. Stations with KHz return 2rates may selec
8、t more stringent criteria. Stations must include their minimum NP data criteria as a note in their Site LogsSignal Processing and Center-of-Mass CorrectionStations should use signal return properties such as mean, peak-mean, skew and kurtosis to monitor systems performance. A team should be setup to
9、 definition the essential parameters and tests. Stations should quantify the range bias effect on specified satellites (e.g. LAGEOS, Ajisai and Envisat) over the pertinent dynamic range of their systems by switching range measurements between minimum and maximum return levels during ranging operatio
10、ns. The Signal Processing Working Group will specify a prescription for the stations to follow. Two-Color Ranging The Signal Processing Working Group will investigate the dependence of retroreflector (internal) range correction on wavelength.The Data Formats and Procedures Working Group should addre
11、ss the misalignment of corresponding NP epochs between the two-wavelength data sets when using the standard NP construction procedure.The CB will devise a better way to report two-color simultaneous passes in the quarterly report card, rather than or in addition to the present method where the passe
12、s are reported separately.The CB, the Data Centers, and the Data Formats and Procedures WG will work with the two-wave length stations to implement a mechanism to deliver differential delay to the Data Centers. Local SurveyStations should verify the survey of their system and target at least every t
13、wo years. Current requirements are 1mm accuracy. Local ties between co-located instruments should be determined with an accuracy of 1 mm, with full variance/covariance information, available in SINEX format.Refraction ModelThe Refraction Study Group and the Analysis Working Group will identify the s
14、teps necessary to implement the Ciddor-Mendes refraction model as the standard for the ILRS.Stations should strive to increase low-elevation (20 degrees) tracking to support refraction model testing.The Refraction Study Group will draft a letter and suggest some laboratories that the CB might approa
15、ch to provide the refraction constants. Analysis and Data ProductsThe AWG will investigate new analyses and data combination approaches to expand the SLR data product capability, in particular to further shorten product interval time.The AWG will assess the currently used IERS “background“ models fo
16、r tidally coherent signals in the geocenter and EOP and report back to the IERS Conventions Group.All analysis groups should have submitted their required benchmark solutions by the end of November 2003; the Benchmark judges (Pavlis, et al) are tasked to report the Pilot Project results by the end of 2003.3All analysis groups participating in the POS+EOP Pilot Projects should implement (1) 7-day data arc lengths and (2) epochs aligned
