System Overview - Magos SR Series User Manual

2.3

SYSTEM OVERVIEW

SR outdoor perimeter defense sensors are designated for outdoor installation and use
only. It provides high accuracy, real-time location and speed data on detected targets.
The SR series is a radar technology based sensor. This means that it transmits low
power (less than 100mW) RF signal in the C-Band frequency and inspects the returned
signal. Radars detect movement within the transmitted beam coverage area, based on
modification in the returned signal and Doppler induced frequency detection. The SR
series contains no moving parts and relies on a multi-channel antenna array and digital
beam forming technology to determine target azimuth. This fact increases scan rate
capabilities and thus enhances detection probability and s detection performance in
general. In addition it contributes to MTBF increase making the entire system more
reliable. Finally as an RF based sensor the SR exhibits superb immunity to lighting,
visibility (FOG, Smog), weather (rain, snow) and other environmental conditions.
The SR implements all data processing, detection and target tracking algorithm
intrinsically, and reports the tracking results via Ethernet UDP protocol to the host
computer approximately twice per second.
Unlike most radars, the SR Series support "zero Doppler" detection – meaning that it
can detect very slow moving targets (crawlers etc) and tangent moving targets. Static
objects are not reported as targets since each target must travel a certain minimum
target to be considered as a target, however a moving target that was tracked and stop
moving will still be detected.
Radar coverage area is nominally 120° in azimuth (horizontal plane) and 30° in
elevation. A more accurate description of the radar coverage area can be found in
Figure 11. Note that in similar to all transmitting/receiving antennas and devices, the SR
also exhibits low gain to areas outside the stated coverage area (above 60° to the left
or to the right of the face of the radar and even to the back of the radar). This results in
some wanted and unwanted phenomena for example:
● Zero range detection: even when installed on very high (>10m) poles with zero
tilt angle – the radar might still detect targets moving on the ground directly
below it (allegedly increasing coverage in elevation to 90 degrees below the
horizon).
● Near range disturbances: large moving targets (or metallic objects acting as
reflectors) in the near vicinity of the radar (up to 10 meters away from it for
human up to car sized targets) outside the area of coverage and even directly
behind the radar might be detected by the radar and falsely interpreted as
targets moving within the coverage area.
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