What's the difference between radar and PIR motion sensors?
PIR (passive infrared) detects heat changes and struggles in outdoor heat-reflective environments, generating false alarms from sun, rain, and animals. Radar actively emits RF energy and tracks moving objects by speed and size, delivering 90%+ false-alarm reduction in outdoor settings. Radar works day/night and through light fog; PIR is cheaper but unreliable for perimeter defense.
Can radar sensors mount on existing camera poles?
Yes—most radar sensors mount to standard 1.5" poles at 3–5 meters height. Verify RF line-of-sight to your detection zone (concrete and metal reflect; trees and rain absorb minimally). Avoid mounting directly above hot asphalt or near metal fences that distort detection patterns. Use high-quality PoE cabling to minimize voltage drop over long cable runs.
How do I prevent radar false alarms from wind-blown objects or rain?
Configure per-zone sensitivity and object-size filters to reject objects moving below a speed threshold (e.g., 0.5 m/s). Rain and leaves trigger brief, low-confidence detections easily filtered. Tune dwell-time (object must occupy zone for 1–2 seconds) to ignore transient events. Test your zone settings during windy weather before live deployment.
Do radar sensors work behind glass or fencing?
Radar penetrates wire fencing well but reflects off solid metal. Glass is transparent to most microwave frequencies, though tempered/reflective glass may attenuate signal. Test line-of-sight and signal strength before committing to a mounting location. Avoid mounting in enclosed structures (chain-link + metal shed) where reflections create dead zones.
How much PoE power do radar sensors consume, and will my switch handle it?
Standalone radar sensors typically draw 25–40W; integrated radar + camera units consume 80–120W. A typical 48-port PoE switch supplies ~250–400W total budget. Four radar-camera pairs consume 320–480W, exceeding budget. Plan redundant switches or use power budgeting calculators to size infrastructure correctly at the start.
Should I use radar alone or pair it with cameras?
Radar alone detects intrusion but can't provide ID-quality evidence for incidents or investigations. Pair radar with high-res or panoramic cameras (radar triggers recording) or thermal cameras (radar + thermal for night confirmation). Multi-layer detection prevents system failure when one technology fails.
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