Introduction to Radar Systems 2002 Radar Antennas

Introduction to Radar Systems

Radar Antennas

Radar Antennas - 1 PRH 6/18/02

MIT Lincoln Laboratory

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Radar Antennas - 2 PRH 6/18/02

MIT Lincoln Laboratory

Focus

Propagation Medium

Target Cross Section

Antenna

Transmitter Receiver

Waveform Generator

Signal Processor

A / D

Pulse Compression

Doppler Processing

Main Computer

Detection

Tracking & Parameter Estimation

Console / Display

Recording

Track Radar Equation

S / N=

Pt G2 2

(4 )3 R4 k Ts Bn L

Search Radar Equation

S / N=

Pav Ae ts 4 R4 k Ts L

Radar Antennas - 3 PRH 6/18/02

G = Gain Ae = Effective Area

This Lecture

Ts = System Noise Temperature

L = Losses

Radar Equation Lecture

MIT Lincoln Laboratory

Antenna Definition

? "Means for radiating or receiving radio waves"*

? A radiated electromagnetic wave consists of electric and magnetic fields which jointly satisfy Maxwell's Equations

? Transitional structure between guiding device and free space

Figure by MIT OCW.

Radar Antennas - 4 PRH 6/18/02

MIT Lincoln Laboratory

* IEEE Standard Definitions of Terms for Antennas (IEEE STD 145-1983)

Antenna Characteristics

? Accentuates radiation in some directions, suppresses in others ? Designed for both directionality and maximum energy transfer

Radar Antennas - 5 PRH 6/18/02

Courtesy of Raytheon. Used with permission.

Courtesy of Raytheon. Used with permission.

Courtesy of U. S. Navy.

MIT Lincoln Laboratory

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