Accession Number:

ADA014942

Title:

Laser Rangefinding Techniques for Helicopter Fire Control Applications. Phase II - Nonstabilized Gimballed Laser Concept.

Descriptive Note:

Final test rept. Jun -Oct 74,

Corporate Author:

FRANKFORD ARSENAL PHILADELPHIA PA

Personal Author(s):

Report Date:

1975-03-01

Pagination or Media Count:

37.0

Abstract:

The concept of employing a non-stabilized gimbal for mounting a laser rangefinder on an AH-1G helicopter was evaluated using existing hardware. The overall results indicate that this technique produced slant range errors of approximately 7 over the altitudes tested 300, 500, 1000, and 1500 feet. The evaluation showed the range error to increase significantly as operational altitude decreased. This is due to angular pointing errors translating into large slant range errors when small grazing angles are incurred. Range errors approaching 15 were projected with this system at 50-100 foot altitudes. It was also determined that the use of first pulse return logic generally produced smaller range errors than last pulse logic. In addition, a reduction in operational airspeed resulted in a slight decline in the range error. In summary, utilization of a non-stabilized gimballed laser rangefinder configuration by the copilotgunner for helicopter fire control systems was only marginally effective at lower altitudes. The need for stabilization of the pointing system is indicated particularly under nap-of-the-earth NOE conditions. The addition of a stabilization capability will aid laser pointing while simultaneously allowing use of magnification to improve target detection, recognition and identification ranges. Author

Subject Categories:

  • Helicopters
  • Lasers and Masers
  • Fire Control and Bombing Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE