RDR PRINCIPLES Flashcards
The slower an antenna rotates, the larger the ____
Hits Per Scan value
Bearing referenced to your ship is?
Relative Bearing
Bearing Angle is obtained by ?
Moving the antenna to the point of maximum signal return
Radar systems that detect only range and bearing are called
Two-Dimensional Radars
Radars that detect height, range and bearing are called
Three-Dimensional Radars
Range Resolution is primarily dependent on the _____
PW of a rdr system
What affects the speed, direction and travel of electromagnetic wavefronts traveling through the air
Atmospheric Conditions
What are the components in a Pulse Radar System? (RIA has STD)
The Synchronizer, Transmitter, Duplexer, Reciever, Indicator and Antenna System
What supplies the timing signals to coordinate the operation system of the Pulse Radar System
Synchronizer
What generates electromagnetic energy in short powerful pulses of the Pulse Radar System
Transmitter
What allows the same antenna to be used to both transmit and receive?
Duplexer
What detects and amplifies the return signal
Receiver
What produces a visual indication of the range and bearing of the echo
Indicator
Scanning
systematic movement of a radar beam
____ is the simplest type of scanning and is usually used in 2D search raders
Stationary-Lobe Scanning
This type of scanning is used in FC rdrs and employs four signal quantities to track moving targets
Monopulse Scanning
What are the two basic methods of scanning
Mechanical and Electronic
Radar Systems are divided into operational categories based on what energy transmission methods
Continuous Wave, Frequency Modulation and Pulse Modulation
Which method transmits a constant freq and detects moving targets by the change in freq caused by the electromagnetic energry reflecting from a moving target.
Continuous Wave Method
Doppler Effect/Doppler Shift
change in freq caused by the electromagnetic energry reflecting from a moving target
What method is a signal that constantly changes in freq around a fixed reference used to detect stationary objects
Frequency Modulation
What method uses short pulses of energy over long listening times to determine target range. It doesn’t depend on singal freq or target motion, hows an advantage over CW and FW methods and is the most common type of radar
Pulse-Modulation Method
Most radars are system variations of what two types of functions
Search Radar and Track Radar
