71 



are also telemetered acoustically to the support ship which carries a 

 transducer array for receiving data and tracking/commanding SPURV. Frequency- 

 shifted and digitally-coded signals provide the acoustic link. Depth control 

 uses a digital reference which is manipulated to provide incremental, saw- 

 tooth or long, slow, ramp-like depth excursions. Course changes on an aziinuth 

 program are available on command. 



The UARS (Unmanned Arctic Research Submersible) system was developed during 

 a two-year program (1971-1972) with the objective of advancing technology 

 to permit remotely controlled under-ice observations and demonstrating the 

 system's capability (Francois and Modland, 1972). The system consists of 

 two major elements: the vehicle which serves as an instrument platform and 

 an acoustic tracking, command and recovery system. The major instrumentation 

 package aboard UARS is an under-ice acoustic profiling system by which the 

 elevation of the under-ice surface is measured and digitally recorded five 

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

 provide an overall elevation accuracy of 0.09m (0.3 ft). An obstacle avoidance 

 sonar detects potential pressure ridge projections to the desired operating 

 depth of UARS. Silver zinc batteries supply power for runs in excess of 

 10 hours at 3.7 knots. Launch and recovery of the vehicle was conducted through 

 the Arctic ice cap and is described in Appendix F. 



The UARS system was successfully demonstrated off Fletcher's Ice Island 

 (T-3) in the Spring of 1972. It has been inactive since then. 



2.4.2 EPAULARD 



The EPAULARD vehicle is a development of the Centre National pour 1' Exploitation 

 de Oceans (CNEXO) . Its purpose is to conduct exploratory missions of the 

 deep ocean floor. The primary exploratory instruments carried by this vehicle 

 are a photographic camera/strobe and an echo sounder. Its projected operating 

 depth of 5,000m (19,685 ft) makes it the deepest operating untethered system 

 under development. Operationally EPAULARD' s mission is straightforward, in 

 that, it is programmed to run a pre-determined course at a selected speed 

 and duration once it arrives at the bottom. All data will be stored aboard 

 the vehicle for processing on the surface. Sea trials of the prototype are 

 scheduled to commence in July 1979. 



2.4.3 ROVER 



The ROVER vehicle will be the culmination of a five year program now underway 

 at Heriot-Watt Unversity, Edinburgh, Scotland. Conceptually, ROVER will 

 operate "piggy-back" from ANGUS-003 and at a specified depth will be deployed 

 from it without a tether. TV signals (1 picture/second) , command/control 

 functions, and other data will be transmitted from ROVER to ANGUS-003 through- 

 water. 



The scheduled activities for the ANGUS- 00 3/ROVER development program are as 

 follows: 



