This is marketed as a high precision low-range device, for use during final approach and flare. The unit is declared as certified under TSO - C87
This TSO calls for test under the conditions below
(1) Lateral velocities from 0 to 50 feet per second.
(2) Longitudinal velocities from 0 to 300 feet per second.
(3) Pitch angel (sic) range of 0 to ±15 degrees.
(4) Roll angel (sic) range of 0 to ±20 degrees.
(5) Vertical velocity from 0 to 15 feet per second up to 100 feet and 0-20 feet per second above 100 feet.
I think that makes it clear what the minimum design aims were for this unit. What it actually achieves I cannot comment on.