Iridium Communications, a global provider of satellite-based voice and data services, operates a constellation of low Earth orbit (LEO) satellites that deliver coverage across the entire planet, including remote and polar regions. Building on this infrastructure, the company has introduced its Iridium PNT service, which provides positioning, navigation and timing (PNT) capabilities as an alternative and complements to traditional Global Navigation Satellite Systems (GNSS). The service is designed to address growing concerns around the reliability and vulnerability of GNSS-dependent systems.

Modern economies run on synchronization. From financial transactions and telecommunications networks to aviation and maritime operations, accurate timing and positioning are essential. However, conventional Global Navigation Satellite Systems (GNSS), such as GPS, are increasingly vulnerable to interference, spoofing, and signal blockage. Iridium PNT addresses these vulnerabilities by delivering a truly independent and resilient source of PNT data, one that works anywhere on Earth, even in the most challenging environments.

A Global Network Built for Resilience

At the core of Iridium PNT is a unique constellation of crosslinked low Earth orbit (LEO) satellites. Unlike traditional satellite systems, this architecture enables continuous global coverage, ensuring that signals remain available across oceans, polar regions, and remote locations. More importantly, the Iridium PNT signal is designed to function where others cannot - penetrating indoors, operating in dense urban environments, and maintaining performance during GNSS outages. This capability transforms PNT from a convenience into a dependable utility, capable of supporting mission-critical operations without interruption.

Rather than replacing GNSS, Iridium PNT is designed to complement it. By providing an independent signal source, it enhances overall system resilience and protects against disruptions caused by jamming or spoofing. In scenarios where GNSS signals are compromised, whether due to environmental conditions or intentional interference, Iridium PNT ensures continuity. This layered approach is becoming increasingly essential as industries and governments seek to safeguard critical infrastructure.

Key features of Iridium PNT:

• 1,000x Stronger Than GPS: Iridium PNT penetrates indoors and signal-challenged urban canyons where high-rise buildings create multipath issues for GPS.
• LEO Satellites: An innovative mesh architecture of 66 cross-linked LEO satellites forms a global network to provide a robust time and location service everywhere - urban and remote alike.
• Trustworthy PNT Source: Complex, overlapping beam patterns combined with signal authentication techniques allow Iridium PNT to deliver trusted, secure time and location capabilities.

Iridium PNT ASIC

To further accelerate adoption, Iridium is extending its PNT capabilities into silicon with the introduction of the Iridium PNT ASIC, a compact, purpose-built chip designed for seamless integration into next-generation devices. Planned for commercial availability around 2026, the ASIC represents a major step toward embedding resilient PNT directly into hardware.

Engineered in an ultra-small 8 x 8 mm form factor, the chip is designed to fit into systems that use traditional GNSS components, enabling deployment across a wide range of applications from industrial infrastructure to connected devices.

Key features include:

• Built-in resilience against jamming and spoofing
• Simplified integration with standard interfaces
• Support for standalone or hybrid GNSS + Iridium deployments
• Nanosecond-level timing accuracy aligned with global UTC
• Configurable PPS outputs for system synchronization

By embedding secure, authenticated PNT capabilities directly into chipsets, Iridium enables developers to design systems that remain operational even in GNSS-denied environments.

Critical Applications

Iridium PNT is purpose-built for industries where downtime is not an option:

• Telecommunications (including 5G synchronization)
• Financial services requiring precise timestamps
• Transportation and logistics
• Government and defense applications
• Energy and utilities

Across these sectors, Iridium PNT provides a dependable foundation for operations that demand both accuracy and resilience.

Iridium PNT is already operational, supporting deployments globally. At the same time, developments like the PNT ASIC point toward broader adoption, enabling resilient PNT to be integrated directly into a wide range of devices and systems. As reliance on precise timing and positioning continues to grow, so does the need for systems that can operate reliably under all conditions. Iridium PNT reflects a shift toward resilient, globally available PNT, ensuring continuity even when traditional systems are disrupted. In environments where timing and positioning are critical, such redundancy is becoming less of an option and more of a requirement.

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