LoRa

MRT uses LoRa as a radio PHY we can put on airdropped or remote nodes — GPS-denied, EW-contested, no cloud broker assumed. It is a link, not a public network-server product.

LoRa is a low-power, wide-area (LPWAN) physical layer for links that need range and battery life more than throughput. It can transmit over distances up to 10–15 kilometers in rural areas or 2–5 kilometers in urban settings, at ultra-low power — suitable for battery-operated devices in remote or hostile locations.

The modulation is chirp spread spectrum (CSS), a technique borrowed from radar. Spreading the signal across a wide bandwidth gives resistance to interference, jamming, and multipath fading. Combined with adaptive data rates (0.3 kbps to 50 kbps), a node can trade range against throughput so sensor data still gets through in noisy RF.

Why it belongs in an MRT system

• Low power for long-lived unattended nodes.
• Long range without cellular or satellite backhaul.
• CSS robustness in contested or cluttered spectrum.
• Point-to-point or private links. No vendor network server and no cloud broker are required.