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Microwave and Radar Engineering by Gottapu Sasibhushana Rao

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12

Introduction to Radars

12.1 INTRODUCTION

The word RADAR is an acronym from the words Radio Detection And Ranging; that is, finding and positioning a target and determining the distance (range) between the target and the radar by using radio frequency. The basic radar equipment consists of a transmitter, a receiver, a duplexer, and an antenna. The basic principle behind the radar is simple: The transmitter sends out a very short duration pulse at a high power level. The pulse strikes an object (or a target), and energy will be reflected (known as radar returns or echoes) back to the radar receiver. The radar determines the distance (range) to the target by measuring the travel time of the radar pulse to the target and to come back from the ...

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