A core software concept for integrated control
ELLIS F. HITT, Michael Kluse, Robert Broderson · Journal of Guidance Control and Dynamics · 1983
circles of radius 1, 2, or 3 ft with an additional asymmetric marker 1 ft beyond the circle on the y axis. There was little change in error with the simulated change in attitude. The values of the error were calculated at each distance and plotted against the log of the distance. The changes over the distance from 6.25 to. 200 ft were so small as to not affect the standard error by as much as 0.2 deg. Results from a typical set of runs are shown in Table 1. The ratios between the standard deviations of the errors were predicted to be inversely proportional to the square roots of the numbers of markers, roughly 1.36. The simulation yielded 1.58, 1.38, and 1.31 for 1, 2, and 3 ft, respectively. The ratios of standard deviations at different distances were compared in Table 2 where oj represents the standard deviation for a circle of radius y. To explore the effect of an increase in the accuracy of the scanning laser radar, in some of the runs it was assumed that each marker was read three times and the result averaged to get a more accurate position rading. The predicted ratio between the standard errors was 0.577. When run with 13 reflectors and a radius of 3 ft, this gave a standard error of 0.49±0.04 deg. The ratio of the corresponding standard errors was 0.568.