# Improved Techniques for the Surveillance of the Near Earth Space Environment with the Murchison Widefield Array

## TL;DR

This paper presents advanced passive radar techniques using the Murchison Widefield Array to detect smaller space objects by extending coherent processing intervals through innovative range and Doppler compensation methods.

## Contribution

It introduces a two-stage linear range and Doppler migration compensation approach, including Keystone Formatting and dechirping, to enhance space surveillance capabilities.

## Key findings

- Detection of objects smaller than previous methods
- Extended coherent processing intervals achieved
- Potential for higher order Doppler compensation

## Abstract

In this paper we demonstrate improved techniques to extend coherent processing intervals for passive radar processing, with the Murchison Widefield Array. Specifically, we apply a two stage linear range and Doppler migration compensation by utilising Keystone Formatting and a recent dechirping method. These methods are used to further demonstrate the potential for the surveillance of space with the Murchison Widefield Array using passive radar, by detecting objects orders of magnitude smaller than previous work. This paper also demonstrates how the linear Doppler migration methods can be extended to higher order compensation to further increase potential processing intervals.