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Security Radars

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Glossary of terms

Azimuth is the horizontal angle around a fixed reference point, typically measured from 0 to 360 degrees.
Beam width
Beam width is a figure-of-merit used to compare antennas. Beam width is measured as the angle between the half-power (-3 dB) points referenced to the peak power on boresight (centre of beam).
Clutter refers to objects that cause unwanted reflections to be seen by radars. Grass, bushes, trees, water, parked cars, posts and buildings are all sources of clutter. High levels of clutter can cause performance issues with radar systems.
Equivalent Isotropic Radiated Power. EIRP allow direct comparison between antennas with different beam widths by showing the hypothetical power that would need to be transmitted in all directions (isotropic) to have equivalent transmitted power.
Elevation is the vertical angle above or below fixed reference plane, typically measured from -90 to +90 degrees.
Continuous wave (CW) radars constantly transmit a signal, the opposite to pulsed radar. CW is ideal for short ranges. To measure target range without using pulses, the transmitted frequency is modulated (FM) hence FMCW relates to radar technology.
License exempt
License exempt means the equipment conforms to regulations that permit operation without the user first obtaining a license from the relevant radio regulation authority.
A radome is a protective plastic cover that allows microwaves to pass through but prevents water from entering, typically used to protect an antenna while still permitting it to function (unlike a metal cover)

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