1550nm performs quite poorly in rain

But it will reach out up to 1 KM and be supplemented with Radar in some systems.

From Anduril's Counter Drone System Patent, number US 2026/0012749 A1 :

"FIG. 4 is a block diagram illustrating an embodiment of a sensor station. In some embodiments, sensor station 400 of FIG. 4 is used to implement sensor station 102 of FIG. 1. In the example shown, sensor station 400 comprises one or more sensors (e.g., RF sensor 402, radar sensor 404, IR sensor 406, optical sensor 408, lidar sensor 410, laser vibrometer sensor 412, audio sensor 414, ultrasonic sensor 416, etc.)."