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Nonuniform Doppler extraction-enhanced multichannel extensive cancellation algorithm for passive radar using Iridium
Hongwei Fu1, Zhang Zhang2, Yu Luo1
1School of Electronic Engineering, Naval University of Engineering, Wuhan, 430000, China.
Scientific Reports
|August 13, 2025
Summary
This study introduces a novel space-based passive radar (PR) system using Iridium satellite signals for enhanced target detection. A new algorithm, NuDE-mECA, effectively suppresses clutter while maintaining low-speed target detection capabilities.
Area of Science:
- Electrical Engineering
- Aerospace Engineering
- Signal Processing
Background:
- Passive radar (PR) utilizes existing noncooperative signals for target detection and tracking.
- Existing ground-based PR has limited coverage, while medium- to high-orbit space-based PR suffers from insufficient receiving power.
- Low-orbit satellite signals offer global coverage but present challenges with multipath clutter broadening due to dual movement.
Purpose of the Study:
- To propose a space-based passive radar (PR) system utilizing Iridium satellite signals.
- To develop an advanced algorithm for mitigating multipath clutter broadening in space-based PR.
- To enhance detection range and preserve low-speed target detection capabilities.
Main Methods:
- Implementation of a PR system leveraging Iridium satellite communication signals.
- Proposal and application of a nonuniform Doppler extraction-enhanced multichannel extensive cancellation algorithm (NuDE-mECA).
- Comparative analysis of NuDE-mECA against traditional multichannel ECA and uniform Doppler extraction methods.
Main Results:
- The proposed Iridium-based PR system demonstrates improved detection range and ambiguity function.
- NuDE-mECA effectively suppresses multipath clutter broadening caused by satellite and receiver movement.
- NuDE-mECA shows significantly reduced computational complexity compared to existing methods.
- The algorithm maintains detection capabilities for near-field, low-speed targets.
Conclusions:
- The Iridium satellite signal is a viable source for space-based passive radar applications.
- NuDE-mECA offers superior clutter suppression and computational efficiency for space-based PR.
- The findings support the development of lightweight, high-precision space-based PR systems.
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