tside sources 
anted oscilla- 
ing and con- 
lerometers 1), 
ors is greatly 
oppler radar, 
systems — is 
n period. An 
equivalent to 
lum or Schu- 
t it oscillates 
>, consequent- 
irbances. The 
ial advantage 
atform (con- 
nd torques), 
1 can provide 
plete attitude 
  
m PVRU. 
SURVEY NAVIGATION, CORTEN 85 
  
: = : : : ; : af . PVR 
Fig. 25. Aeroflex inertial vertical; power supply and computer of the PVRU. 
Acknowledgement. 
In compiling this report, the author was assisted by members of the subcommission 
I3, particularly by Mr Eldon D. Sewell.