2.4.3 Instrumentation: 
a. Doppler: 
Precision compass (precision gyrosyn, corrected for latitude, coriolis 
acceleration, bank, etc.) 
Doppler radar 
Drift and ground speed computer 
Doppler/DR navigation computer 
Presentation instruments 
— ground speed and drift 4 
= L/R indicator € e» 
x control indicator 
b. INS: 
Gyrostabilized platform with accelerometers — Schuler tuned 
Digital computer, high performance, including: 
Double integrators and correctors for elapsed time, longitude change, 
latitude change, etc. 
Mode selector unit (MSU) 
Control display unit (CDU) 
No. 5 Integrated navigation 
2.5.1 Methods: 
(5A) Modern integrated survey navigation methods and systems based on 
“Doppler plus Survey Interface” (example: ITC PHOTNAV system), intended 
primarily to produce perfect survey navigation. 
(SB) Modern integrated survey navigation methods and systems based on 
"INS integrated with aerial cameras and presentation system" (example: J 
Fokker F-27 Integrated System), intended not only to produce perfect e = 
navigation but also to present the aerial camera's 6 elements of exterior orien- 
tation at the instant of exposure — i.e. position and altitutde (X, Y, Z) and 
the three attitude angles. 
This paper deals primarily with these integrated systems (Nos. 5A and 
SB).