Accession Number : ADA112691

Title :   Low Cost Development of INS Sensors for Expendable RPV Control and Navigation.

Descriptive Note : Final rept. Apr 79-May 81,


Personal Author(s) : Kim,D G ; Russell,James G

PDF Url : ADA112691

Report Date : Aug 1981

Pagination or Media Count : 71

Abstract : A two year development effort has resulted in the design, fabrication and test of a feasibility model 3-axis vibrating beam accelerometer and a brassboard cycloidal magnetic vector sensor. The cycloidal magnetic vector sensor is based on a rotating coil technique which eliminates slip rings. It performed as expected, and demonstrated an accuracy of approximately 0.25 degrees. The 3-axis vibrating beam accelerometer is based on the principle that a vibrating beam will change its frequency as a function of the applied tension. Using six beams, two per sensing axis, connected to a common mass, a 3-axis accelerometer can be designed. Such a design measures acceleration, by a change in beam vibration frequency, as a function of applied acceleration to the mass. The accelerometer, at first, demonstrated an insensitivity due to frequency lock between the beams. This effect was eliminated, but the necessary change in design caused an unstable bias and non-linearity of the scale factor. A solution to these problems was also conceived, and hardware changes made. However, to fully demonstrate the concept requires a computer and software, which is outside the scope of this program. (Author)

Descriptors :   *Accelerometers, *Magnetic detectors, *Remotely piloted vehicles, Low costs, Beams(Structural), Vibration, Frequency, Tension, Control, Navigation

Subject Categories : Pilotless Aircraft
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE