LIGHTWEIGHT NORTH SEEKING GYRO AZIMUTH SURVEYING INSTRUMENT MODEL NO. 11NG531A.
Abstract
This report covers all the activities undertaken at the contractors lab. in the design, development, building, and testing of three Lightweight Gyro Azimuth Surveying Instruments. Operational requirements of the system call for the provision of a true north reference by gyroscopic means within an accuracy of 43 arc seconds at the equator and within a time limit of 20 minutes for each azimuth determination. This requirement applies over a wide environmental range as well as adverse field conditions. The systems demonstrated a capability of better than 30 arc seconds accuracy at 34 degree latitude under laboratory conditions. They also performed without degradation while operated with any one of the following power sources: 24 V vehicle batteries, 24 VDC vehicle generator, and 115 V, 60 cps, .15 kw field generator. Performance at Fort Greely, Alaska also bettered the requirement of 94 arc seconds at that high latitude (63 N). During the environmental testing phase of the program, some difficulties were encountered in the areas of temperature and vibration effects, but they have all been resolved except for the -40 F vibration, which is considered only partially successful. Performance characteristics, established both under normal operation and at environmental extremes, are well within the specified requirements. Nevertheless, certain improvements can still be incorporated for the enhancement of field operation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1965
- Accession Number
- AD0486317