2-27] 



ANALYSIS OF THE CONVERSION PROBLEM 



129 



provide angular rate and angle information which has rms errors in each 

 channel of about 2 mils /sec (0.11° /sec) and 2 mils (0.11°) respectively. 

 Referring to Equation 2-64 and the accompanying discussion, it is also seen 

 that the computer filtering system must be designed to limit the rms noise 

 on the indicator to a value of about 1.0° rms in order to meet the pilot 

 steering accuracy requirement. 



The other attack course (80° off the nose at lock-on) may be analyzed in 

 a similar fashion. For this case the maximum allowable error is about 10.7° 

 (80° off the nose at lock-on will result in about 90° off the target's nose 

 at time of firing). Using the allowable errors already established for the 

 head-on case, the values of the allowable predictable bias errors and the 

 values of the random range and time errors may be established as shown 

 in Table 2-4. It should be emphasized that this allocation can be adjusted 

 to suit the designer's convenience, provided the total error allowance is not 

 exceeded. 



Chapter 9 will present a discussion of how error specifications and 

 dynamic input requirements derived in this manner can be used to dictate 

 the detailed requirements of the range and angle tracking loops of the radar. 



Table 2-4 MEASUREMENT ACCURACY REQUIREMENTS 

 FOR BEAM ATTACKS 



Units: degrees, seconds, feet. S = 5.2. Vs( )^ = S.S. 



