INSTRUMENTATION AND TESTING |
This could include advice on the type of receiver, when to use dual-frequency
receivers, clock stability standards, measurement interval (to ensure data
from different receivers can be processed together), provision of a test
network for regular calibration of instruments and software, etc. Obviously
only GPS receivers that can track and record integrated carrier beat phase
are appropriate. Unfortunately there is little further advice given. The
Australian S& S mention nothing except to suggest dual-frequency instrumentation
as a function of the class of survey and the baseline length (section
10.3.4).
The FGCS has tested GPS receivers (and the data reduction software) over a special calibration/test network in the Washington D.C. area (section 4.4.3).
The Australian S& S mentions that "system testing" may be required after acquisition of new equipment, new software, or when trialing new procedures. The test consists of the measurement of a small network, as well as the ongoing analysis of production results using the instrumentation, software or procedures under scrutiny. It is not clear if it sufficient to furnish evidence of an overseas test, or one carried out by the GPS manufacturer.
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© Chris Rizos, SNAP-UNSW, 1999