G„A«Zotov, A* !VUZhilkin 
MODERN COORDINATE REGISTRATION STSTETvLC ?OR 
PHDTOGRAiiMETRIC INSTRUMENTS USED IN THE SOVIET UNION 
The development of the analytical methods of aerctriangu- 
latyon and generation of the digital terrain models in the So 
viet Union requires ab the first place digital coordinate re 
gistration systems for universal stereoplotters, stereo and 
mono-comparacors, instruments for picking up data from maps and 
so on* Since the requirements imposed on such systems are con 
siderably similar use can be made of a single versatile regist 
ration system, featuring the following characteristics: 
1 ) type of encoders used - linear displacement - code 
angular rotation - code 
2 ) number of coordinates simultaneously registered - 
R, 3, 4 
' 3 ) number of numerical positions - six decimal positions 
*> dafca representation; decimal code readout panel; coor- 
dinate cataloging on a wide paper tape: punctured tape using 
MTK- 2 *codej magnetic tape#. 
In accordance with the requirements the circuitry of such 
registration system can be divided in the following basic com 
ponent s:* 
1 ) a digital encoder unit 
2) a control unit 
- 3 ) output recording devices. 
The availability of a standard output , code and independ 
ent encoder ^mit allows for the use of different types of enco 
ders by replacing the matching circuit incorporated in the 
system* The control unit alternately interrogates encoders and 
converts their code into that of output recording devices, 
which ar 3 listef belplv: 1 ) a digital readout panel, 2 ) a digi 
tal printer, 3) a tape puncher, 4) a magnetic storage unit* 
The control unit also provides for different operating modes of 
the system v/here two, three or four encoders can be operated