EXPECTED INSTRUMENT ACCURACY OF MICROWAVE DISTANCERS,
Abstract
Humidity effect in microwave distancers was evaluated and found to cause phase shifting in the cyclic error variation. Cyclic error variation was found to be present in MRA-1, MRA-2 and MRA-3 Tellurometers reaching values up to + or -20 cm. The repetition of measurements at different weather conditions and by extending the line 15 meters with one meter intervals between measurements proved to improve the results essentially in MRA-1 and MRA-2 operations. The extension of the line 10 meters in MRA-3 operations and the use of interchangeable Master/Remote functioning proved to be necessary to obtain the ultimate accuracy. The resolution capability of the MRA-1 and MRA-2 Tellurometers is about + or -2.3 cm, while the allover standard error for one observation is about + or -7.5 cm. The resolution capability of MRA-3 Tellurometer is about + or -1.3 cm and the allover standard error for one observation is about + or -1.5 cm. The standard error for one observation in Electrotape DM-20 seems to be about + or -0.8 cm. The use of microwave absorbents or reflection plates has been found to reduce the reflection errors from solid or moving objects. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1965
- Accession Number
- AD0634240
Entities
People
- Simo H. Laurila
Organizations
- Ohio State University