5. Conclusions 
a. Performance and accuracy 
Cost and operational effort 
Comparison of efficiency in aerial survey 
a. Performance and accuracy 
5.] The performance and the accuracy of a modern integrated survey flight 
and navigation system depends on the parameters 
choice of the basic type of system (e.g. doppler or inertial) 
length of flight lines (and turns) 
. number of flight lines (and turns) 
airplane speed (e.g. propeller or jet aircraft) 
elapsed time, or distance (since the last fix). 
5.2 The relations between these parameters are illustrated in the graphs 
figures 4, 5, 6, 7, 8, 9 and 10. 
From these graphs comparisons can be made between doppler's and 
inertial's performance. 
5.3 Doppler systems have the tendency to be more accurate 
for lower speed aircraft 
for longer flight lines 
for the lower number of flight lines and turns D 
for flights of longer duration. 
5.4 Inertial systems have the tendency to be more accurate 
for higher speed aircraft 
for shorter flight lines 
for the larger number of flight lines and turns P? 
for flights of shorter duration. 
5.5 For typical medium scale survey missions — which may consist of 
4 … 8 lines of 50 … 150 km length each — doppler systems have a higher 
accuracy when aircraft of the 150 Kts speed range are used, i.e. 
propeller-driven aircraft. 
1) The performance of doppler systems also depends on the number of turns; the 
performance of inertial systems is independent of the number of turns.