806 



altitude return, 222-224 



aluminas, 566 



Ament, W. S., 192 n. 



amplifier, high-gain, 601-602; IF, see IF 

 amplifier; parametric, 356; power 

 transfer function, 144; RF, see RF 

 amplifier; variable parameter, 356; 

 see also gain (adj.) 



amplitron, 603-604, 606 



amplitude distribution, cumulative, 193- 

 196 



amplitude fluctuations, 200 



amplitude modulation (AM), 17-18 



amplitude noise, 198-203, 395-396, 479 



AMTI systems, 317 



analogue computers, 744 



analogue model, 37-38 



Anderson, Tore N., 546 n. 



Andrews, E. R., 233 



angle demodulator, 389-390, 414 



angle error, 303 



angle measurement stabilization prob- 

 lem, 429-433, 741 



angle noise, 203-207, 396 



angle tracking, accuracy requirements 

 in, 478-480; in pulsed doppler system, 

 332 



angle tracking error, 300 



angle tracking loop, 264, 267, 483-484; 

 mechanization of, 492-498; position 

 errors in, 489-491; rate errors in, 486- 

 489 



angle tracking modulation, 424 



angle tracking noise, 398-401; applica- 

 tion to evaluation of, 264-269 



angle tracking stabilization, 457-468, 

 473 



angle tracking system, 474, 480-485 



angular error, 265-266, 290 



angular resolution, calculation of, 138- 

 173; defined, 138; factors aflfecting, 

 168-173; in high-resolution radar sys- 

 tems, 333-335 



angular scanning frequency, 296 



anisotropic transmission line, 560 



anode, magnetron, 582-583 



antenna aperture, 334 



antenna beam, rotation of, 9 



antenna beamwidth, 90, 337, 515; in 

 high-resolution radar systems, 333- 

 334; see also beamwidth 



antenna control loops, errors in, 442-448 



INDEX 



antenna corner frequencies, 467 



antenna directivity, 514 



antenna disturbance, aircraft motion 

 and, 437 



antenna drift, signal fade and, 462 



antenna drives, 450-451, 481 



antenna gain, 514, 518, 766 



antenna pattern, characteristics of, 169- 

 170; detection probability and, 142- 

 143; ground mapping and, 770 



antenna position, 11 



antennas, 511-579; aircraft motion and, 

 464; angle tracking error and, 301 

 anomalous effects in, 523-424; beam 

 width and, 90, 333-334, 337, 515 

 characteristics of, 513, 518; corporat( 

 feed structure, 527; db difference, 522 

 detection probability and, 156; direc- 

 tional, 10; directional couplers, 548 

 doppler navigation system, 741; dual- 

 feed, 203; duplexing schemes and 

 567-573; hybrid junctions, 548-550 

 fan beam, 524-528 {see also fan beam 

 radar); fundamental concepts, 513- 

 515; Gaussian shape, 289; ground 

 mapping, 773, 780; linear array, 524- 

 528; lobe structure, 187-188; lock on, 

 520; lossless matched, 513; omni- 

 directional, 17; parabolic reflectors 

 and, 169; paraboloidal, 515-518; pat- 

 tern simulation and, 520-523; pencil- 

 beam, 188, 515; power pattern 

 of, 161; power requirements, 135; 

 PPI system, 617; radar wave 

 propagation and, 174; radomes and, 

 531-535; rearward-looking, 15; stabi- 

 lization of, 430-432, 741, 770; system 

 requirements for, 518-520; tracking 

 function of, 519-520; tracking stabili- 

 zation and, 440-452; transmission 

 lines and, 535-540; as transmitters, 

 138-139, 514; two-arm spiral, 528-531; 

 types of, 169; weather radar, 768 



aperture illumination, 516 



APSEL tube, 673 



aquadag, 625 



arc-over, 711 



Atlas, D., 760 n. 



atmosphere, attenuation in, 227-230; 

 refraction of radar waves by, 175, 

 233-237; standard, 234 



atmospheric duct, 234 



