# In-situ detecting cooperative-target's speed and rotation inertia using structured light

## TL;DR

This paper introduces a novel 3D laser sensing method using complex vector light beams to simultaneously measure the speed and spin rate of moving targets, overcoming limitations of traditional 2D techniques.

## Contribution

The paper presents a new 3D measurement technique employing complex vector light beams for direct detection of target speed and rotation inertia, demonstrated through laboratory experiments.

## Key findings

- Successful laboratory proof-of-principle experiment
- Simultaneous measurement of speed and spin rate
- Overcomes limitations of 2D sensing techniques

## Abstract

Laser remote sensing represents a powerful tool that enables the accurate measurement of the speed of moving targets. Crucially, most sensing techniques are 2-Dimensional and only enable direct determination of the speed along the line of sight. A disadvantage that is very often overcome using two-dimensional techniques that in many cases are hard to implement and expensive. Here we put forward a novel 3-Dimensional technique that enables the direct and simultaneous measurement of both, the speed and the spin rate of cooperative targets. This technique is based on the use of complex vector light beams, whose polarization and spatial degree of freedom are coupled in a non-separable way. We present experimental evidence of our technique by performing a laboratory proof-of-principle experiment.