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

uhoh

asked Mar 18 '19 at 2:10

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Soyuz landing ground detection

Did Apollo have braking rockets for soft landing on Earth?

Why does this boat have a landing pad? (SpaceX's GO Searcher) Any plans for propulsive capsule landings?

How does a gamma ray altimeter work? What kind of sensor is used?

Alternative to GPS navigation for vertical landing, especially on other planets

When did soviet capsules begin using retropropulsion immediately before landing?

Why does the New Shepard vehicle not have an exhaust trench?

What happens to Blue Origin's New Shepard capsule if their one engine fails?

Why does Blue Origin land the crew capsule separate from the booster?

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

How does a gamma ray altimeter work? What kind of sensor is used?

How does launching suborbital payloads on New Shepard compare to sounding rockets?

How are New Shepard's tilting fins and gimbaling nozzle used together (or separately) to control the rocket?

When did soviet capsules begin using retropropulsion immediately before landing?

How many burns does New Shepard have during a descent?

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