F-8 



5 times a second on each of three separate, narrow, upward- looking beams 

 to accuracies of O.lm (0.3 ft). Other instrumentation includes an 

 obstacle avoidance sonar (to detect and avoid collision with pressure 

 ridges), a timed pinger (for tracking), an acoustic homing system 

 (two hydrophones), and a self-powered pinger which will automatically 

 activate and deploy itself on a mooring line for emergency location. 

 Launch/Retrieval (Under-ice): The vehicle is lowered on a cradle through 

 a hole cut in the ice. The cradle is negatively buoyant and UARS is 

 buoyantly suspended from it by electromagnetically-operated latch pins 

 which release and unmate the two assemblies underwater. Retrieval 

 involves the use of a acoustic homing system in the vehicle which responds 

 to a homing beacon centered in a capture net. Upon contact with the net 

 a capture probe mounted in the nose of the vehicle firmly meshes with 

 the net which is raised clear of the water. 



Status: Inactive 



Builder: Applied Physics Laboratory 



University of Washington 



Seattle, Washington 



1 



