510 AUTOMATIC TRACKING CIRCUITS 



With the information contained in the range tracking input time function 

 lying below 3 rad/sec, every effort should be made to match the automatic 

 range tracking system bandwidth to this input spectrum. Factors pre- 

 cluding close match are the requirements on tracking error and stability of 

 the range tracking loop as discussed in connection with Fig. 9-22. Com- 

 pletion of all details of design for a range tracking servo system transfer 

 function follows the basic procedures presented earlier in this chapter in 

 connection with angle tracking systems. In all precision tracking systems 

 the servo bandwidth greatly exceeds the information bandwidth. However, 

 by making a preliminary study of this nature, the servo-system designer 

 can proceed with confidence in that the low-frequency portion (where the 

 largest amount of energy lies) has been matched and no high-frequency 

 information has been discarded. 



