How does New Shepard Crew Capsule sense proximity to trigger retropropulsion just before impact?

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How does the New Shepard Crew Capsule sense proximity to the ground in order to trigger retropropulsion just before impact?

GIFs from Blue Origin NS-10: New Shepard launch & landing, 23 January 2019

For example, Soyuz uses a gamma ray altimeter for several reasons:

How does a gamma ray altimeter work? What kind of sensor is used?
Soyuz landing ground detection

For reference:

GIF from Soyuz MS-08 landing

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edited May 9 '19 at 5:59

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asked Mar 18 '19 at 2:10

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How can one ensure safety of the crew capsule if the rocket blows up at max dynamic pressure?

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How does New Shepard Crew Capsule sense proximity to trigger retropropulsion just before impact?

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