198 



REFLECTION AND TRANSMISSION OF RADIO WAVES 



30 



^S 25 



I— 



S 20 

 b 



g 

 o 10 



320°330°340°350° 0° 10° 20° 30° 40° 50° 60° 70° 80° 90° 100° 110° 120° 130° 



320°330°340°350° 0° 10° 20° 30° 40° 50° 60° 70° 80° 90° 100°110°120°130° 



320°330°340° 350° 0° 10° 20° 30° 40° 50° 60° 70° 80° 90° 100° 110° 120° 130° 

 Fig. 4-20 Plot of Median Echo of B-36 Averaged over 5° of Azimuth. 



4-8 AMPLITUDE, ANGLE, AND RANGE NOISE^s 



In a tracking radar, rapid variations in target aspect can affect the 

 smoothness of tracking and hence its accuracy. The variations in the target 



J^Most of the material in this Paragraph has been derived from the following NRL reports, 

 and from references in footnotes 11-14, which can be consulted for further details: 



J. W. Meade, A. E. Hastings, and H. L. Gerwin, N'oise in Tracking Radars, NRL Report 

 3759, Nov. 15, 1950. 



A. E. Hastings, J. E. Meade, and H. L. Gerwin, Noise in Tracking Radars, Part II: Dis- 

 tribution Functions and Further Power Spectra, Jan. 16, 1952. 



D. D. Howard and B. L. Lewis, Tracking Radar External Range Noise Measuretnents and 

 Analysis, NRL Report 4602, Aug. 31, 1955."^ 



A. J. Stecca, N. V. O'Neal, and J. J. Freeman, J Target Sitnulator, NRL Report 4694, 

 Feb. 9, 1956. 



A. J. Stecca and N. V. O'Neal, Target Noise Simulator -— Closed-Loop Tracking, NRL 

 Report 4770, July 27, 1956. 



B. L. Lewis, A. J. Stecca, and D. D. Howard, The Effect of an Automatic Gain Control on 

 the Tracking Performance of a Monopulse Radar, NRL Report 4796, July 31, 1956. 



