13 illus- 
zer. The 
inator is 
reference 
scanning 
direction 
100th the 
he action 
; combin- 
ions. The 
to be un- 
er. 
. parallax 
direction 
letection, 
he random 
bed under 
rrain, the 
a periodic 
he pattern 
below the 
luctuation 
lope. The 
ect to the 
or azimuth 
luctuation 
om fluctu- 
and other 
output of 
to Figure 
fluctuation 
extent the 
correlators 
remaining 
the phase 
lator B is 
pose. The 
nd applied 
shaft of a 
shifts the 
rate of 19 
n. The re- 
ence input 
irection of 
ase of the 
the motor 
ysition re- 
tion of the 
s therefore 
rain slope 
is called 
se-shifting 
ie steering 
teering di- 
y UL TU 
vailable 
  
  
'X' REF. X 
AUTOMATIC STEREO (Appendix) 
  
xt 
  
  
  
  
Vx 
REGISTRATION 
ERROR SIGNAL © > 
  
  
Vy 
  
  
v 
  
  
L PE PARALLAX 
[T n d SIGNAL 
  
  
  
  
tid 
v REF m x | LPF |—— —>—— © PARALLAX 
SIGNAL 
ASSUME MISALIGNMENT IN 'X’ DIRECTION SUCH THAT REGISTRATION ERROR 
SIGNAL IS POSITIVE WHEN SCANNING FROM LEFT TO RIGHT 
  
  
  
  
  
  
REG/DISC V | V X PARALLAX | Y' PARALLAX 
DIRECTION OF SCAN OUTPUT X Y SIG SIG 
+X (LEFT TO RIGHT) + + O + O 
— X (RIGHT To LEFT) e — O + O 
+Y (UPWARD) O O + O O 
— Y  (DOWNWARD) O O = O O 
ASSUME MISALIGNMENT IN '"Y' DIRECTION. SUCH THAT REGISTRATION DISCRIMINATOR 
OUTPUT IS POSITIVE WHEN SCANNING UPWARD 
  
  
  
  
  
  
REG/DISC V | V. 'X PARALLAX | Y PARALLAX 
DIRECTION OF SCAN OUTPUT X Y SIG SIG 
+X (LEFT TO RIGHT) O O O O 
—X (RIGHT TO LEFT) O = O O O 
+Y uewaRD T O + O + 
~'Y (DOWNWARD) — O — O + 
Figure 13. Parallax Analyzer 
] 
I 
| stop 
   
   
E SIGNAL 
FROM NOISE(AC) |CORRELATING| TS 
X PARALLAX O———$———] FILTER — — MULTIPLIER ——— ——»9— — o SiGNAL 
MULTIPLIER | A | D.C 
| | | 
Ld 
REF 
[ 
CORRELATING| | 
| SERVO 
MULTIPLIER 
| B | ord 
PHASE 
. . SHIFTING MOTOR | 
CIRCULAR | X RESOLVER 7/0 ON | 
SCAN go —— — } ( ] 
SIGNAL y \ \ O o/ | 
N A 
N — | so 
SIGNAL 
=---—-——— A oM 
ares J 
SLOPE SERVO 
Figure 14. Slope Analyzer 
rection is properly established, the action of 
the slope servo adjusts the angle of the steering 
resolver to accommodate changes in slope di- 
rection. 
The T.S.M. signal is derived from the 
amplitude of the slope signal. Multiplying corre- 
lator A extracts the slope signal from the noise. 
The reference input to correlator A is the refer- 
ence for correlator B shifted in phase by 90°. 
The reference input is thereby maintained in 
phase with the slope signal and the D.C. out- 
put of correlator A is a measure of the terrain 
slope magnitude, regardless of the direction of 
slope, and is therefore the required T.S.M. 
signal. 
1ed, 
sst 
1at 
18 
usly 
f 
lates 
a of 
the 
of 
e 
atrol- 
pohoto- 
tb at 
sessary 
ans 
achine 
spot 
as 
ns 
at 
for 
efore 
tions 
a 
will 
lace 
* Professor OI BLEeCTTLOAL Log Lioor Aa s VENT NP Us WP RS wy ww —— e —À 9 
Canada.