RADAR SYSTEM
Clear-cut of the word RADAR is Radio Detection and Ranging which operates under the principle similar to sound-wave reflection. In aircraft RADAR systems are placed at the front inside the nose the aircraft which would be the perfect place to transmit and receive signal without any interruption.
RADAR systems have a transmitter which produces an electromagnetic signal which is transmitted and radiated into the space by an antenna. Electromagnetic signal hit and sticks the object and get reflect back and received by the receiver. Received echo Signal from the antenna is processed by a computer and display on screen inside the cockpit displayed to the pilot. Where it is processed to detect the location and distance of the object on the earth surface accurate from the point where the Radar is fixed by calculating the time taken radar signal to stick the object and reflect back. As the aircraft fly at high altitude target location is measured in degrees and angles.
Types of RADAR used in Aircraft
- Pulse Doppler RADAR transmits high pulse repetition frequency utilizes the Doppler frequency shift of the echo signal to reject and detect moving aircraft.
Doppler shift are calculated by transmitted high pulse and the received echo signals are mixed in a detector.
- Moving Target Indicator RADAR transmits low pulse repetition frequency low pulse to avoid range cluster and the received echo signals are mixed in a detector where it differentiate echoes of a moving object from stationary object detect moving aircraft.
