An airborne simulator investigation of the accuracy of an optical track command missile guidance system Page: 2 of 61
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NACA RM A56G24
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
AN AIRBORNE SIMUATOR INVESTIGATION OF THE ACCURACY OF
AN OPTICAL TRACK COMMAND MISSILE GUIDANCE SYSTEM
By Joseph G. Douvillier, Jr., John V. Foster,
and Fred J. Drinkwater III
An airborne missile simulator was used to represent visually the
predicted flight behavior of the Navy XASM-N-7 Bullpup air-to-surface
missile, which is guided along the line of sight to the target by
"bang-bang" radio signals controlled by the pilot of the launch airplane.
The accuracy with which this missile (insofar as represented by the simu-
lator) can be guided was assessed in simulated attack runs against a
ground test target. Runs were made for firing ranges of 15,000 feet and
8,000 feet, with and without initial missile dispersion, at a nominal
attacker indicated airspeed of 350 knots and dive angle of 200. Five
pilots with varying degrees of related experience participated in the
Quantitative response measurements showed that the simulator gave a
good representation of the trajectory and control characteristics pre-
dicted for the Bullpup missile, and the simulation appeared plausible to
the pilots. With no initial dispersion, the probable miss distance was
29 feet for the 15,000-foot firing range runs and 20 feet for the 8,000-
foot firings. Initial dispersion caused no significant increase in the
probable miss distance. There was no evidence of marked differences in
guidance proficiency among the test pilots; a moderate number of simulated
firing runs was required to attain reasonably constant proficiency; and
there was no evidence of appreciable loss in proficiency after a pilot
layoff of as long as 1 month.
The Air Force and the Navy have recently expressed interest in air-
launched missiles with simple guidance systems of the type diagrammed in
figure 1. The missile would be guided along the visual line of sight to
the target by radio signals controlled by the pilot of the launch airplane.
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Douvillier, J. J., Jr.; Drinkwater, F. J., III & Foster, J. V. An airborne simulator investigation of the accuracy of an optical track command missile guidance system, report, November 23, 1956; (digital.library.unt.edu/ark:/67531/metadc53211/m1/2/: accessed January 24, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.