The Navy League’s Magazine Seapower reports that “a synthetic aperture/ground moving target Indicator Radar Payload and has been given the prototype designation AN/DPY-2()” for the MQ-21 Blackjack.
The Coast Guard has always wanted their unmanned air system (UAS) to have a radar system and the Scan Eagle that the Coast Guard has contracted for has been tested with a radar from this manufacturer. I am not sure if Coast Guard Scan Eagles are radar equipped, but, if not, it appears that radar equipped small UAS are a definite possibility.
The RQ-21 Blackjack is, like the Scan Eagle, made by Boeing Insitu. It is heavier, 135 lb (61 kg) vs 48.5 lb (22 kg) max takeoff weight, with a correspondingly larger payload weight, but like the Scan Eagle it launches from the same launch and recovery systems.
The radar may be a bit large for Scan Eagle, but apparently not for the Blackjack.
The NSP-5 delivers high-performance capabilities despite its small size, weight and power characteristics. Commercially, the NSP-5 is available in a standard pod configuration that measures 5.4 inches (13.7 centimeters) in diameter and 45.3 inches (115 centimeters) in length, weighs 16 pounds (7.3 kilograms) and consumes 150 watts of power.