Radar System Engineering

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544 THE RECEIVING SYSTEM—INDICATORS [SEC. 13.18 The performance of this type of PPI is comparable to that in which the transmitter trigger is generated automatically. Technically, it involves fewer parts, its method of area balancing has somewhat greater reliability, and it has the advantage of being usable with self-synchronous modulators. In common with all balanced-waveform methods, its duty ratio is limited to some 50 to 60 per cent unless excessively large peak currents are used in the balancing waveforms. 13.18. The Method of Pre-time-base Resolution.—In certain cases it is desirable to transmit the scanner data in terms of slowly varying sine and cosine voltages derived from a sine-cosine potentiometer, or by the modulated-carrier technique used in the B-scope of Sec. 13.14. These are used as potential sources for sawtooth generators, as indicated in Fig. 13.51, where the switches represent double-sided clamps that are _ . . FIG. 13.51 .—Pre-time-base resolution method of PPI ssnthesis. opened during the sweep interval. Thus the signals at the input to the amplifiers are sine-and-cosine-modulated sawteeth of precisely the same nature as those obtained by passing a sawtooth through a synchro. The amplifiers can, therefore, be identical with those of Fig. 13.46. If it is too inconvenient to provide both polarities, one can be omitted in each circuit and a phase-inverting amplifier inserted between the sawtooth generator and the final amplifiers. In this case, however, it will be necessary either to use d-c coupling (which is difficult) or to provide clamps on the grids of the final amplifiers. This method can be used at very high scanning speeds, since it is possible to use a variable condenser for carrier modulation. It has advantages over the resolved–time-base methods when very fast sweeps are used, since there is no starting delay such as that introduced in passing sweeps through a synchro. It can also be advantageously used when the scanner is so remote as to make the transmission of sweep signals by cable difficult, and when the scan is at the same time too rapid to permit
SEC. 13.19] 1’HE RANGB-ll EIGII1’ l.Vl~l CA I’oli 545 the use of mechanical repeaters. Aa extreme case is that of radar relay (see Chap. 17). Many of these advantages make the technique partitularly appropriate for use on range-height indicators. On the other hand, under average conditions, pre-time-base resolution is considerably less satisfactory than the methods previously described. The sine potentiometer, though simple, is prone to troublesome irregularities which cannot be completely filtered, except on extremely slow scans, without causing phase lags in the basic scanner data. The use of a carrier and of demodulators introduces considerable complexity compared with methods described earlier. The necessity of maintaining the sawtooth generators in proper normalization in order to avoid distortion is somewhat of a burden compared to other cases where only one such generator is involved and where, furthermore, any lack of constancy affects only the size and not the fidelity of the display. 13.19. The Range-height Indicator.—Any off-centered PPI can be used as a range-height indicator by substituting elevation angle for azimuth, providing the indicator can follow the scanner involved. In most cases, it is desirable to present height on a scale that is considerably expanded in comparison to that used for the display of ground range. In consequence the most adaptable PPI techniques are those in which each cartesian coordinate ha? its own amplifier which permits the desired height expansion to be provided simply by increasing the gain of the proper channel. Themethods of Figs. 13.46 and 13.51 can both be used in this way. Simplification canusually be effected. Thehorizontal sweep always occurs on the tube face in one direction from the origin. In many cases, this isalsotrue of the vertical component. (Sometimes negative heights are involved when the radar is on an elevated site. ) Furthermore, it is often possible to use one or both of the approximations sin o = o and cos e = 1. In any case in which a sweep component is unipolar, the clamps of Fig. 13.46 can be reduced to unstitched d-c restorers, and the switched clamps of Fig. 13.51 can become single-sided, though still being switched. The approximation cos 0 = 1 allows the use of unmodulated sweeps in the horizontal direction; this is of no particular virtue if the resolvedsweep technique is used, but provides a considerable saving in connection with the use of a modulated carrier. The approximation sin o = o allows the use of linear data transmitters, such as linear potentiometers and condensers. Since the applications of Fig. 13.46 and Fig. 13.51 to use with an RHI are fairly obvious, no attempt will be made to discuss them specifically. Instead, a brief description will be given of an RHI for use with rapid scans including the “ sawtooth” type developed by certain electrical scanners (Sees. 9.14, 9.15, and 9.16). It is assumed that sin 0 = d and
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CHAPTER 1 INTRODUCTION BY LOUIS N.
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4 IN TRODUC7”ION [SEC.1.2 flik~c
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6 INTRODUCTION [SEC.1.3 pulse leaki
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8 INTRODUCTION [SEC.1.4 antenna is
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10 INTRODUCTION [SEC.14 step in out
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12 INTRODUCTION [SEC.1.5 where high
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14 INTRODUCTION [SEC.1.6 England, F
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16 INTRODUCTION [SEC.1°7 Microwave
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CHAPTER 2 THE lU.DAR EQUATION BY E.
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20 THE RADAR EQUATION [SEC.22 radia
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22 THE RADAR EQUATION [SEC.25 Again
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24 THE RADAR EQUATION [SEC.2.5 time
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26 THE RADAR EQUATION [SEC.2.5 smal
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28 THE RADAR EQUATION [SEC.!2.7 lim
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30 THE RADAR EQUATION [SEC.28 Anoth
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32 THE RADAR EQUATION [SEC.28 first
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34 TIIE RADAR EQUATION [Sm. 29 the
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36 THE RADAR EQUATION [SEC.2.10 (Vo
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38 THE RADAR EQUATION [SEC.210 prac
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40 THE RADAR EQUATION [SEC.2.10 tai
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42 THE RADAR EQUATION [SEC.2.11 swe
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44 THE RADAR EQUATION [SEC.2.11 res
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46 THE RADAR EQUATION [SEC.211 Alth
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48 THE RADAR EQUATION [SEC.212 othe
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50 THE RADAR EQUATION [SEC.212 The
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52 THE RADAR EQUATION [SEC. 2.12 Th
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54 THE RADAR EQUATION [SEC.213 smal
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56 THE RADAR EQUATION [SEC. 2.14 an
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58 THE RADAR EQUATION [SEC.2.15 not
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60 TIIE RADAR EQUATION [SEC.2.15 wt
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62 THE RADAR EQUATION [SEC.215 per
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64 PROPERTIES OF RADAR TARGETS [SEC
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66 PROPERTIES OF RADAR TARGET,S [SE
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PROPERTIES OF RADAR TARGETS [SEC.37
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88 PROPERTIES OF R.41~.l R T.-lRGE~
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92 PROPERTIES OF RA1l.4R TARGETS [S
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SEC.315] STRUCTURES 99 example, the
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SF,C. 3.16] CITIES 101 reflection w
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SEC. 3.16] CITIES 103 signal repres
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SEC. 3.16] CITIES 105 four signals
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108 PROPERTIES OF RADAR TARGETS [SE
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112 PROPERTIES OF RADAR TARGETS [SE
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CHAPTER 4 LIMITATIONS OF PULSE RADA
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118 LIMITATIONS OF PULSE RADAR [SEC
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122 LIMITATIONS OF PC’LSE RADAR [
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128 C-W RADAR SYSTEMS [SEC. 5.1 tar
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130 C-W RADAR SYSTEMS [sm. 53 point
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132 C-W RADAR S’YSTEMS [SEC.56 bi
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134 C-W RADAR SYSTEMS [SEC. 56 tran
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136 C-W RADAR SYSTEMS [SEC. 5.6 int
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138 C-W RADAR SYSTEMS [SEC, 5.6 rel
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140 C-W RADAR SYSTEMS [SEC 37 and j
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142 C-II’ RADAR SYSTEMS [SEC. 57
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144 C-W RADAR SYSTE.JfS [SEC. 58 gi
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146 C-W RADAR SYSTEMS [SEC. 58 Modu
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148 C-T RA DAR S YSTE.lf S [SEC. 59
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150 C-W RADAR SYSTEMS [SEC. 5.11 cy
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152 C-W RADAR SYSTEMS [SEC.5.11 Now
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154 C-W RADAR SYSTEMS [SEC.5.11 exc
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156 C-W RADAR SYSTEMS [SEC. 5.11 in
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158 C-W RADAR SYSTEMS [SEC. 5.12 Pu
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CHAPTER 6 THE GATHERING AND PRESENT
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162 THE GATHERING AND PRESENTATION
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Page 168 and 169:
168 THE GATHERING AND pRESENTA TION
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~70 THE GATHERING AND PRESENTA TION
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SEC. 66] PLANE DISPLAYS INVOLVING E
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SEC. 69] IiARLY AIRCRAFT-WARNING RA
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SEC. 69] EARLY AIRCRAFT-WARNING RAD
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f$Ec. 69] EARLY AIRCRAFT-WARNING RA
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SEC. 6.9] EARLY AIRCRAFT-WARNING RA
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SEC. 6.10] PPI RADAR FOR SEARCH, CO
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SEC. 6.11] HEIGHT-FINDING INVOLVING
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SEC.6.12] HEIGHT-FINDING WITH A FRE
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- - -— . .. —-— - .. —-.
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SEC. 612] HEIGHT-FINDING J~ITH A FR
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SEC. 6.13] HOMING 197 ber of the pa
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SEC.6.13] HOMING 199 usually made t
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SEC. 6.13] HOMING 201 application,
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SEC. 6.14] PRECISION TRACKING OF A
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SEC.6.14] PRECISION TRACKING OF A S
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SEC. 614] PRECISION TRACKING OF A S
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f$Ec. 614] PRECISION TRACKING OF A
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SEC. 615] PRECISION TRACKING DURING
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CHAPTER 7 THE EMPLOYMENT OF RADAR D
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SEC.72] AIDS TO INDIVIDUAL NAVIGATI
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SEC. 7.2] AIDS TO INDIVIDUAL NAVIGA
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SEC. 73] AIDS TO PLOTTING AND CONTR
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SEC.7.3] AIDS TO PLOTTING AND CONTR
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SEC.7.3] AIDS TO PLOTTING AND CONTR
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SEC. 7.4] THE RELAY OF RADAR DISPLA
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SEC. 7.51 RA DAR IN THE RAF FIGHTER
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SEC. 7.6] THE U.S. TACTICAL AIR COM
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SEC.7.6] THE U.S. TACTICAL AIR COMM
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238 THE EMPLOYMENT OF RA DAR DATA [
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240 THE EMPLOYiWENT OF RADAR DATA [
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242 THE EMPLOYMENT OF RADAR DATA [S
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244 RADAR BEACONS [SEC. 8 duration
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246 RADAR BEACONS [SEC. 8.1 beacons
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248 RADAR BEACONS [SEC.8.1 4. Porta
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250 RADAR BEACONS [SEC.8.2 Table 8.
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252 RADAR BEACONS [SEC.84 restricte
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254 RADAR BEACONS [SEC. 85 radar se
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256 RADAR BEACONS [SEC.85 In the ca
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258 It Al)AIt BEACONS [S,,c, S3 Sim
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SEC. 86] FREQUENCY CONSIDERATIONS 2
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SEC. 87] INTERR~A TION CODES 263 wi
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SEC. 8.9] TRAFFIC CAPACITY 265 diff
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SEC.8.9] TRAFFIC CAPACITY 267 which
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270 RADAR BEACONS [SEC. 810 range a
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272 ANTENNAS, SCANNERS, A.VD STABIL
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274 ANTENNAS, SCANNERS, AND ST ABIL
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276 ANTENNAS, SCANNERS, AND STABILI
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SEC. 913] THE AN/APQ-7 (EAGLE) SCAN
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SEC.913] THE AN/APQ-7 (EAGLE) SCANN
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SEC. 9.14] SCHWA RZSCHILD ANTENNA 2
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SEC. 9.14] SCH WA RZSCHILD ANTENNA
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SEC. 9.15] SCI HEIGHT FINDER 299 de
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SEC.9.15] SCI HEIGHT FINDER 301 In
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SEC.916] OTHER TYPES OF ELECTRICAL
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SEC,9.17] STABILIZATION OF THE BEAM
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SEC. 9.17] STABILIZATION OF’ THE
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SEC. 9.17] STABILIZATION OF THE BEA
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t$Ec. 9,18] DATA STABILIZATION 311
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SEC. 920] INSTALLATION OF SURFACE-B
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SEC. 922] STREA MLIA”ING 315 func
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SEC. 9.25] EXAMPLES OF RADOMES 317
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SEC.9.25] EXAMPLES OF RADOMES 319 a
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SEC. 10.1] CONSTRUCTION 321 of the
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SEC. 10.1] CONSTRUCTION 323 later r
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SEC.10.2] THE RESONANT SYSTEM 325 m
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SEC. 1021 THE RESONANT SYSTEM 327
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SEC. 10.2] THE RESONANT SYSTEM 329
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SEC. 103] ELECTRON ORBITS AIVD THE
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SEC. 103] ELECTRON ORBITS AND THE S
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SEC. 103] ELECTRON ORBITS AND THE S
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SEC. 10.4] PERFORMANCE CHARTS AND R
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SEC. 10.4] PEIWORMilNCE CHARTS AND
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SEC. 10.5] MAGNETRON CHARACTERISTIC
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SEC.105] MAGNETRON CHARACTERISTICS
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SEC. 105] MAGNETRON CHARACTERISTICS
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SEC. 10.5] MAGNETRON CHARACTERISTIC
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SEC. 10.6] MAQNETRON CHARACTERISTIC
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L%C. 10.6] MAGNETRON CHARACTERISTIC
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SEC. 10.7] PULSER CIRCUITS 357 and
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SEC. 10.7] PULSER CIRCUITS 359 tude
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SEC. 10.7] PULSER CIRCUITS 361 cen~
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SEC. 108] LOAD REQUIREMENTS 363 TAB
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SEC. 10.8] LOAD REQUIREMENTS 365 to
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SEC. 109] THE HARD-TUBE P ULSEh? 36
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SEC. 10.9] THE HARD-TUBE P ULSER 36
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SEC 10.9] THE HARD-lUBE PULSER 371
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Sl?lc.10.91 LINE-TYPE PULSERS 373 D
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SEC. 10,10] LINE-TYPE PULSERS 375 i
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SEC. 10.10] LINE-TYPE PULSERS 377 I
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SEC. 10.10] LINE-T YPE PULSERS 379
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SEC. 10.10] LINE-TYPE PULSERS 381 T
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SEC.10.11] MISCELLANEOUS COMPONENTS
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SEC. 1011] MISCELLANEOUS COMPONENTS
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R-F CHAPTER 11 COMPONENTS BY A. E.
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SEC.11.2] COAXIAL LINES 393 Why a M
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SEC.11.2] COAXIAL LINES 395 lines h
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SEC.11.2] COAXIAL LINES 397 since n
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SEC,113] JVA VEGUIDE 399 than a qua
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i?EC. 11.3] WA VEGUIDE 401 too grad
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SEC. 113) WA VEGUIDE 403 types of m
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SEC. 11.4] RESONANT CAVITIES 405 co
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SEC. 11.5] D,C”PLEXING AND TR SWI
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SEC. 115] DUPLEXING AND TR SWITCHES
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SEC. 11.5] DUPLEXING AND TR SWITCHE
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SEC.11.6] THE MIXER CRYSTAL 413 sem
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SEC. 11.7] THE LOCAL OSCILLATOR 415
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SEC. 11 .8] THE MIXER 417 minimum l
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SEC.11.10] REASONS FOR AN R-F PACKA
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SEC. 11.11] DESIGN CONSZDERA TZONS
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SEC.11.11] DESIGN CONSIDERATIONS FO
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SEC. 11.12] ILLUSTRATIVE EXAMPLES O
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SEC. 11°12] ILL US’TRA TIVE EXAM
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SEC. 11.12] ILL USTRA TIVE EXAMPLES
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SEC.11.12] ILL US1’IiA TI VE EXA
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CHAPTER 12 THE RECEIVING SYSTEM—R
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SEC. 122] A TYPICAL RECEIVING SYSTE
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SEC.12.2] A TYPICAL RECEIVING SYSTE
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SEC. 122] A TYPICAL RECEIVING SYSTE
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SEC.12.3] SPECIAL PROBLEMS IN RADAR
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SEC.12.4] I-F AMPLIFIER DESIGN 443
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SEC.12.4] I-F AMPLIFIER DESIGN 445
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SEC.124] I-F AMPLIFIER DESIGN 447 i
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SEC. 125] SECOND DETECTOR 449 This
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SEC.12.6] VIDEO AMPLIFIERS 451 ampl
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SEC.12.7] A UTOMA TIC FREQUENCY CON
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SEC. 12.7] A UTOMA TIC FREQUENCY CO
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S~C. 128] PROTECTION AGAINST EXTRAN
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SEC. 128] PROTECTION AGAINST EXTRAN
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SEC. 12.8] PROTECTION AGAINST E-YTR
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&- L,-self resonant COIIS at mterme
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J All resistors~ watt Interstate co
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SEC. 12.10] LIGHTH”EIGIIT AIRBOR.
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s, 0.001 $180 b To reflector To sea
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+ 180v T +120V 470 470 470 470 e“
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SEC.12.11] AN EXTREMELY WIDEBAND RE
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CHAPTER 13 THE RECEIVING SYSTEM—I
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SEC.13.1] ELECTRICAL PROPERTIES OF
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SEC 13.2] CATHODE-RAY TUBE SCREENS
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SEC.13.2] CATHODE-RAY TUBE SCREENS
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SEC. 13.3] SELECTIO.V OF THE CATHOD
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SEC. 13.3] SELECTION OF THE CATHODE
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SEC. 13.4] ANGLE-DATA TRANSMITTERS
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SEC.13.4] ANGLE-DATA TRANSMITTERS 4
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SEC. 13.5] ELECTROMECHANICAL REPEAT
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Page 497 and 498: SEC. 13.7] GENERA TION OF RECTANGUL
Page 499 and 500: SEC. 13.7] GENERATION OF RECTANGULA
Page 501 and 502: . SEC. 13.8] GENERA TION OF SHARP P
Page 503 and 504: SEC. 139] ELECTRONIC SWITCHES 503 T
Page 505 and 506: SEC. 13.9] ELECTRONIC SWITCHES 505
Page 507 and 508: SEC. 13.9] ELECTRO.VIC ISWI TCHES 5
Page 509 and 510: SEC. 13.9] ELECTRONIC SWITCHES 509
Page 511 and 512: SEC. 1310] SAWTOOTH GENERATORS 511
Page 513 and 514: SEC.13.10] SAWTOOTH GE,VBliATOh?S 5
Page 515 and 516: SEC. 1311] ANGLE INDICES 515 bright
Page 517 and 518: SEC. 13.11] ANGLE INDICES 517 the s
Page 519 and 520: . . “4 100k.lw $4.7k-lw .& t, T 0
Page 521 and 522: SEC.K3.121 RANGE AND HEIGIiT INDICE
Page 523 and 524: i%C.13121 RANGE AND HEIGHT INDICES;
Page 525 and 526: SEC. 13.13] DESIGN OF A-SCOPES 525
Page 527 and 528: SEC. 1313] DESIGN OF A-SCOPES 527 f
Page 529 and 530: SEC.1314] B-SCOPE DESIGN 529 \
Page 531 and 532: SEC. 13.14] B-SCOPE DESIG.V 531 wil
Page 533 and 534: Trigger I I I (CT)Sawtooth —. (A)
Page 535 and 536: SEC.1316] RESOLVED TIME BASE PPI 53
Page 537 and 538: SEC. 13.16] RESOLVED mi? TIME BASE
Page 539 and 540: SEC. 13.17] RESOLVED-CURRENT PPI 53
Page 541 and 542: SEC. 13.17] RESOLVED-CURRENT PPI 54
Page 543: + 200V— — — J 60k . Llk )k 60
Page 547 and 548: SEL!. 13.19] THE RANGE-HEIGHT INDIC
Page 549 and 550: SEC. 13.20] RESOLUTION AND CONTRAST
Page 551: SEC. 13.211 SPECIAL RECEIVING TECHN
Page 554 and 555: 554 THE RECEIVING SYSTEM-INDICATORS
Page 556 and 557: 556 PRIME POWER SUPPLIES FOR RADAR
Page 558 and 559: . . . 0.9 P~- 860-’CPS CF over 2
Page 562 and 563: 562 PRIME POWER SLTPPLIES FOR RADAR
Page 572: 572 PRIME POWER SUPPLIES FOR RADAR
Page 575 and 576: SEC. 14.6] SPEED REGULATORS 575 ‘
Page 577 and 578: SEC. 146] SPEED REGULATORS 577 havi
Page 579 and 580: SEC. 14.7] DYNAMOTORS 579 14.7. Dyn
Page 581 and 582: SEC.14.8] VIBRATOR POWER SUPPLIES 5
Page 583 and 584: SEC. 1410] FIXED LOCATIONS 583 port
Page 585 and 586: SEC. 14.13] ULTRAPORTABLE UNITS 585
Page 587 and 588: SEC. l’k~~] SHIP RADAR SYSTEMS 58
Page 589 and 590: SEC. 151] INTRODCCTIO,\- 589 the pr
Page 591 and 592: SEC, 152] NEED FOR SYSTEM TESTING 5
Page 593 and 594: SEC, 153] INITIAL PLANNING AND OBJE
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SEC. 15.4] THE RANGE EQUATION 595 n
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SEC. 15.5] CHOICE OF PULSE LENGTH 5
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SEC. 15.7] AZIMUTH SCAN RATE 599 to
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SEC. 15.8] CHOICE OF BEAM SHAPE 601
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SEC. 15.8] CHOICE OF BEAM SHAPE 603
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SEC. 15.9] CHOICE OF WAVELENGTH 605
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SEC. 15.10] COMPONENTS DESIGN 607 1
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SEC.16.11] MODIFICA TIO.VS A,YD ADD
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SEC. 15.12] DESIGN OBJECTIVES AND L
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SEC. 15.12] DESIGN OBJECTIVES AND L
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SEC. 15.13] GENERAL DESIGN OF THE A
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SEC. 15.14] DETAILED DESIGN OF THE
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SEC. 15.14] DETAILED DESIGN OF THE
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,/ / /“)4 Providenc~ (b) Fm. 16.1
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624 EXAMPLES OF RADAR SYSTEM DESIGN
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CHAPTER 16 MOVING-TARGET INDICATION
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628 MOVING-TARGET INDICATION [SEC,
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630 MOVING-TARGET INDICATION [SEC.
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632 MOVING TARGET INDICATION [SEC.
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. 646 MOVING- TARGET INDICATION [SE
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648 MOVING- TARGET lNDICA TION [SEC
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652 MOVING-TARGET INDICATION [SEC 1
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656 MOVING-TARGET INDICATION [SEC.1
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658 When o = Othe instead MOVING-TA
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662 MOVING TARGET INDICATION [SEC.1
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670 MO VINGTARGET INDICATION [SEC.
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672 MOVING TARGET INDICATION [SEC.1
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674 MOVING- TARGET INDICATION [SEC.
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676 MOVING-TARGET INDICATION ~SEC.
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CHAPTER 17 RADAR RELAY BY L. J. HAW
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682 RADAR RELAY [SEC. 172 transmitt
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684 RADAR RELAY [SEC. 17.3 staggeri
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686 RADAR RELAY [SEC. 17.4 excluded
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688 RADAR RELAY [SEC. 174 long sign
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h Video I 1 I Angle marks RADAR REL
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692 [SEC. 175 ḇ 1 1 1 I ~ LKal tr
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694 RADAR RELAY [SEC. 17.5 generato
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696 RADAR RELAY [SEC. 17.6 station
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698 RADAR RELAY [SEC. 17.6 Video si
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700 RADAR RELAY [SEC. 176 train. Th
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702 RADAR RELAY [SEC.17.7 be obtain
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704 RADAR RELAY @EC. 17.7 illustrat
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[11 1 Bas,c pulse I %e pulse i ~--.
Page 708 and 709:
708 RADAR ltELA Y [SEC. 1743 wave f
Page 710 and 711:
710 RADAR RELAY [SEC. 17.8 actual m
Page 712 and 713:
. 712 RADAR RELAY [SEC. 17.9 Such a
Page 714 and 715:
714 RADAR RELAY [SEC. 17.10 between
Page 716 and 717:
716 RADAR RELAY [SEC. 17.10 signal
Page 718 and 719:
718 RADAR RELAY [SEC. 17.11 suppres
Page 720 and 721:
720 RADAR RELAY [SEC. 17.12 provide
Page 722 and 723:
722 RADAR RELAY [SEC. 17.13 relay l
Page 724 and 725:
724 RADAR RELAY [SEC. 17.14 TaLE 17
Page 726 and 727:
726 RADAR RELAY [SEC. 17.15 RADAR R
Page 728 and 729:
728 RADAR RELAY [SEC. 17.15 Modulat
Page 730 and 731:
730 RADAR RELAY [SEC. 17.15 the sec
Page 732 and 733:
732 RADAR RELAY [SEC. 17.10 pulses
Page 734 and 735:
734 RADAR RELAY [f+iEc.17.16 The vi
Page 737 and 738:
Index A Absorbent materials, 69 Abs
Page 739 and 740:
INDEX 739 B-scope, electrostatic, 5
Page 741 and 742:
INDEX 741 Fairbank, W. M.,80 F Fan
Page 743 and 744:
INDEX ’743 Microwave, reason for
Page 745 and 746:
INDEX 745 Radar, pulse,3 range perf
Page 747 and 748:
INDEX 747 Signal, interference of,
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Radar System Engineering

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