Position fixing with cold atom gravity gradiometers

TL;DR

This paper introduces a novel autonomous navigation method leveraging cold atom interferometers to measure gravity gradients, reducing positional drift over long distances by referencing gravity databases.

Contribution

It presents a new approach combining cold atom gravity gradient measurements with database referencing to improve long-distance autonomous navigation.

Findings

Stable navigation over 1000 km simulated trajectories.

Partial gravity gradient measurements effectively reduce inertial navigation drift.

Demonstrates feasibility of cold atom sensors for practical navigation applications.

Abstract

This paper proposes a position fixing method for autonomous navigation using partial gravity gradient solutions from cold atom interferometers. Cold atom quantum sensors can provide ultra-precise measurements of inertial quantities, such as acceleration and rotation rates. However, we investigate the use of pairs of cold atom interferometers to measure the local gravity gradient and to provide position information by referencing these measurements against a suitable database. Simulating the motion of a vehicle, we use partial gravity gradient measurements to reduce the positional drift associated with inertial navigation systems. Using standard open source global gravity databases, we show stable navigation solutions for trajectories of over 1000km.