Radar primary Flashcards
The formula
Distance =Speed x Time ➗2
What does Radar stand for?
RAdio
Direction
And
Ranging
How does Radar work?
Uses reflective radio waves
What is the wavelength of Radar?
1mm - 100cm
How is the position of the object that reflected energy determined?
1) direction that the Radar Aerial was pointing
2) Time between Transmitting the pulse of energy
Radar uses higher frequency short wave lengths. True or False?
True.
How many pulses May a typical radar transmit?
1200 pulses
67nm
What is weather clutter?
When heavy water droplets reflect the signal
What factors should considered when when choosing the wavelength to use for Radar?
Attenuation
High frequency more attenuation and less range.
Wave length for primary area radar?
23-50cm
Wave length for primary approach radar?
3-10cm wavelength
Wave length for primary surface movement radar/Weather Radar?
2-3cm wavelength
List the two types of clutter.
Ground Clutter= Permanent Echoes (PEs)
Weather clutter= Rain
What is a Primary Surveillance Radar(PSR) blip?
The visual indication in non-symbolic form on a situation display of the position of an aircraft obtained by primary radar
Define Position Indicator
Visual indicators in non-symbolic and/or symbolic form on a situation display of the position of an aircraft l, aerodrome, vehicle or other object
Define Position Symbol
Visual indication in symbolic form on situation display, of the position of an aircraft.
Define Radar Contact
The situation that existed when the Radar position of a particular aircraft is seen and identified on a situation display
Define Radar Control
Indicates that radar derived information is employed directly in the provision of ATC Services
Define Situation Display
An electronic display depicting the position and movement of aircraft and other information as required
What are 3 things every primary radar system must be capable of?
1) Transmitting energy in a suitable form
2) receiving energy in a suitable form reflected from objects within operational range
3) Display Information to the controller
What is a duplexer?
The duplexer is a transceiver, but can only do one at a time.
What is a trigger unit?
Output initiates action
Very brief pulses at regular intervals. Firing at the Modulator
What is a modulator?
Sends high power high voltage plus to transmitter.
On/off switch for Transmitter Unit
What is the Transmitter Unit
Series of pulses or Radar energy to the aerial
What does the duplexer do?
Switches between Transmitting and receiving functions.
What does the Aerial do?
Radiates the energy from the transmitter at regular intervals.
Receives the energy and sends it down to the duplexer.
What does the high gain low noise receiver do?
Amplifies the weak return
What does the time based unit do?
Calculates the range
What does the display unit do?
All information sent back is displayed on the display unit.
