It's listed at pages 183, 188, and 211 — Page 391, Lesson 399

This is the index of the book — the P entries. I want to walk you through the key terms here, because this is your map of what's coming in the radio navigation syllabus. Let's start with the radar terms, since they cluster together. Primary Radar — that's the basic radar that detects a target by the reflection of its own transmitted pulse. It's listed at pages 183, 188, and 211. Secondary Radar isn't in this list, but you'll see PAR — Precision Approach Radar — at pages 184, 190, and 199. That's a ground-based radar that gives you very precise azimuth and elevation guidance during an approach, and it's a primary radar type. PPI is the Plan Position Indicator — that's the display on a radar screen, the circular sweep showing targets around the station. PRF is Pulse Repetition Frequency — how many pulses the radar transmits per second, listed at 185, 200, and 248. And pps is pulses per second — the unit for PRF, at 185 and 309. Now the antenna terms. Parabolic Dish at page 60, and Parabolic Reflector at 192 — that's the curved dish that focuses the radar beam. Parabolic at 211 refers to the same shape. Pencil-shaped Beam at 211 — that's the narrow, focused beam you get from a parabolic reflector. Phased Array at 61 — that's an antenna with multiple elements that steer the beam electronically. Parasitic Elements at 58 — those are the unpowered elements on a Yagi antenna that shape the radiation. Polar Diagrams at 57 and 86 — those are the plots showing how an antenna radiates in different directions. Now the propagation and signal terms. Period at page 5 — that's the time for one complete cycle of a wave. Polarization at 4 — the orientation of the electric field of the wave. Propagation at 19 — how the wave travels. Propagation Paths at 21 — the different routes the signal can take. Propagation Error at 117 — errors caused by the path the signal travels. Power at 20 — signal strength. Phase Comparison at 9 and 112 — comparing the phase of two signals to determine position. Phase Difference at 112 — the difference in phase between two signals. Phase Modulation at 43 and 47 — varying the phase of a carrier to carry information. Now the navigation systems. P-RNAV at 261 — that's Precision Area Navigation, the RNAV standard for terminal operations. PLAN at 286 and Plan Mode at 289 — that's the flight management system display showing your planned route. POS INIT at 272 — that's the Position Initialization page on the FMS, where you enter your starting position. Position Reference System at 306 — the system that provides position data. Position Dilution of Precision — PDOP — at 318 — that's the GPS accuracy factor based on satellite geometry. P Codes at 309 — the precise GPS codes. PRN at 308 — Pseudo-Random Noise, the code that identifies each GPS satellite. And the approach aids. PAPIs at 155 — Precision Approach Path Indicators — the lights that show you if you're on the glide path. Precipitation Static at 98 — static noise caused by rain or snow hitting the aircraft. Practical Range at 187 — the usable range of a radar. That's the P section of the index. It's a lot of terms, but they're all connected — radar, antennas, propagation, and navigation systems.