SahreibeVj Bentkowsky and Kerr 



Displays 



Two sensors are available aboard the DSRV for assistance 

 in performing the final mating maneuvers. These are a TV camera 

 which looks through a viewport in the midsphere lower hatch, and a 

 high resolution short range sonar (SRS) mounted to a retractable 

 boom in the transfer skirt. Only the TV was simulated. Details 

 of the performance of the SRS were not available at the time the 

 simulation study was performed. Also, with good visibility, the 

 TV is a much more informative sensor than the SRS, 



The midsphere TV display was simulated by photographing 

 a model of a submarine. The photograph was then scanned by a 

 CRT, using a flying spot scanner. The size of the area scanned is a 

 function of the distance from the camera to the hatch. The dis- 

 placement of the center of the hatch from the center of the screen 

 is proportional to the distance between the hatch center and the inter- 

 section of the camera axis with the hatch plane. Because of the 

 relatively small angles between the DSRV and DISSUB planes, no 

 attempt was made to provide foreshortening effects. Reproductions 

 of the TV display are shown in Fig, 31, The four radial line seg- 

 ments at the extremity of the picture represent the staples on the 

 submarine deck surface to which a McCann Rescue Chamber can be 

 attached. These staples provide precise centering information for 

 the pilot. 



START OF PROBLEM 



Fig, 31, TV Display 



1172 



