The satellite had reached its 10-year design life on March 10. ISRO indicated the spacecraft will remain operational for limited services, including one-way messaging, but it will no longer support standard navigation functions that depend on precise onboard timing.

Timing loss directly impacts PNT performance

Atomic clocks are the foundational element of any GNSS or regional PNT system. Navigation signals rely on nanosecond-level synchronization between satellites and user receivers; without a stable onboard clock, a satellite cannot provide accurate ranging. In practical terms, the loss of IRNSS-1F as a timing node reduces usable signal geometry and degrades overall system robustness rather than simply removing a satellite from inventory.

IRNSS-1F was launched in March 2016 as part of the original IRNSS constellation, now branded as NavIC. Its loss for navigation further compresses a system already operating with limited redundancy. Public disclosures and recent reporting indicate that only a subset of NavIC satellites are currently fully usable for positioning services, leaving less margin for fault tolerance across the regional coverage area.

Persistent clock reliability challenges

The latest failure reinforces a long-standing issue within the NavIC program: the reliability of space-qualified rubidium atomic clocks. Earlier IRNSS satellites experienced similar failures, forcing ISRO to operate the constellation conservatively and accelerate plans for replacement spacecraft. Across GNSS architectures, clock reliability is a critical determinant of system availability—satellites can remain on orbit yet become functionally irrelevant for navigation if timing degrades.

ISRO has been pursuing second-generation NavIC satellites to restore and expand capability, but progress has been uneven. The NVS-02 satellite, part of this next-generation effort, encountered issues following launch despite successful orbital insertion. At the same time, ISRO continues to invest in the broader timing infrastructure supporting NavIC, including international metrology collaborations aimed at strengthening reference time systems.

Strategic implications for sovereign PNT

The immediate effect is not a loss of NavIC service, but a reduction in resilience at a time when sovereign PNT capability is increasingly treated as critical infrastructure. NavIC was designed to reduce India’s reliance on foreign GNSS for both civilian and government applications. As jamming, spoofing and geopolitical risk reshape the PNT landscape, constellation health—particularly onboard timing integrity—becomes a primary measure of operational capability.

Timing integrity remains the system’s linchpin

The IRNSS-1F failure underscores a fundamental point: end-to-end resilience begins with stable space-segment timing. Advances in signal structure, augmentation and receiver design cannot compensate for degraded clocks in orbit. Restoring NavIC’s full capability will depend not only on replenishment launches, but on achieving durable, next-generation clock performance across the constellation.

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Supported by the European Space Agency (ESA) NAVISP program, the STAGER (‘Sophisticated GNSS Threats Protection’) project addresses the growing challenge posed by deliberate and accidental disruptions to satellite navigation services, an issue of increasing concern for both civil and military sectors.

STAGER introduces a two-part solution designed for dense deployment around critical infrastructure. The first component is the SILENT node (spoofing identification and localization for enhanced navigation and timing), a compact monitoring unit capable of detecting and characterizing GNSS interference signals.

Built using commercial off-the-shelf, multi-constellation GNSS receivers and antennas, the unit continuously monitors satellite signals and surrounding RF activity, using several complementary techniques to detect anomalies in the GNSS signal environment. These include analysis of carrier-to-noise density ratio (C/N0) behavior, automatic gain control trends, RF spectrum monitoring, and the dispersion of carrier-phase double differences.

Together, these methods allow the SILENT unit to distinguish between nominal conditions, jamming events, and spoofing attacks. The system can also estimate the angle of arrival of interfering signals, enabling localization when multiple units are deployed across a region.

AI in the fold

The second component is VAULT (vulnerability assessment and understanding the impact of localized GNSS threats), a server-side application that aggregates and analyzes data from the SILENT network. VAULT classifies interference events using artificial-intelligence techniques, including support vector machine and variational autoencoder models, and then estimates the location of the interference source by combining angle-of-arrival measurements with power-difference-of-arrival analysis.

Beyond detection and localization, VAULT evaluates the operational impact of interference events. Using terrain data and RF propagation models, the tool estimates the affected service volume and identifies airspace or operational procedures that may be degraded by the interference source.

The system was validated through laboratory testing and open-air trials, including experiments during the Jammertest 2025 campaign. Results demonstrated reliable detection of spoofing and jamming signals and successful localization of interference sources using measurements from multiple monitoring units. In validation tests, localization errors ranged from sub-kilometer levels to several kilometers depending on geometry and measurement conditions.Presenting the results of the project at a recent ESA-hosted event, the STAGER team said their concept supports a scalable approach to GNSS resilience. By combining low-cost monitoring nodes with centralized analysis and modeling tools, the system could enable dense monitoring networks around airports, ports, or other critical infrastructure

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The company said the funding will support expansion of its portfolio of navigation technologies that integrate inertial sensors, AI-driven perception systems and sensor-fusion software to maintain accurate positioning in GNSS-denied environments. The technologies are intended for applications across aerospace, defense, robotics and maritime operations.

Focus on GNSS-Resilient Navigation

Advanced Navigation’s core technology stack centers on high-performance inertial navigation systems (INS) combined with advanced sensor fusion algorithms. These systems use data from inertial measurement units (IMUs), computer vision, acoustic sensors and other onboard inputs to estimate position and orientation when satellite navigation signals cannot be relied upon.

Such capabilities are increasingly important as GNSS disruption—whether through interference, jamming or spoofing—has become more common in both civilian and defense operating environments.

Chris Shaw, co-founder and CEO of Advanced Navigation, said the company’s goal is to enable autonomous systems to maintain reliable navigation even in complex operating conditions.

“Our mission is to deliver navigation and autonomy technologies that allow systems to operate reliably across sea, land, air and space,” Shaw said in a statement.

Inertial navigation systems play a central role in these architectures. While INS solutions can maintain navigation continuity without external signals, they accumulate error over time due to sensor drift. Modern navigation stacks therefore rely on sensor fusion techniques that combine inertial measurements with other inputs—such as visual landmarks, lidar data or acoustic signals—to correct drift and maintain accuracy.

Expanding the Alternative PNT Ecosystem

Demand for complementary PNT technologies has grown rapidly as governments and industry seek alternatives to exclusive reliance on satellite navigation. Recent disruptions in regions such as the Black Sea, Eastern Europe and the Middle East have highlighted the operational risks posed by GNSS interference.

Companies developing resilient navigation architectures are increasingly integrating multiple sensing modalities—including visual navigation, signals of opportunity and advanced inertial systems—to provide robust positioning capability when satellite signals are unavailable.

Advanced Navigation has focused on combining high-performance hardware with artificial intelligence-based perception systems. These technologies are intended to support autonomous platforms operating in complex environments such as urban areas, indoor facilities, underground infrastructure and subsea environments.

Applications Across Autonomous Systems

The company’s navigation technologies are used across a range of autonomous platforms including unmanned aerial vehicles, autonomous underwater vehicles, ground robots and maritime vessels. These platforms require reliable navigation even when operating in environments where GNSS reception is blocked or intentionally disrupted.

Advanced Navigation said the new funding will allow the company to accelerate development and global deployment of its navigation technologies while expanding manufacturing capacity.

As autonomous systems become more widely deployed across commercial and defense sectors, resilient navigation architectures that integrate inertial sensing, perception and AI-driven sensor fusion are expected to play a central role in next-generation PNT systems.

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The receivers were delivered under the Modernized GPS User Equipment (MGUE) Increment 1 program, a Department of Defense initiative designed to replace legacy GPS receivers with systems capable of accessing encrypted M-Code signals and operating in contested electromagnetic environments. 

The milestone reflects the large-scale fielding of M-Code-enabled PNT hardware across multiple operational domains, including air, land and maritime platforms.

Scaling Secure Military PNT

M-Code is the latest generation of encrypted military GPS signals designed to improve resistance to jamming, spoofing and other forms of interference. The signal is intended to provide more robust navigation and timing services for military users as electronic warfare and GPS denial capabilities proliferate. 

Under the MGUE program, the Department of Defense is transitioning platforms across the joint force to receivers capable of processing M-Code signals transmitted by modernized GPS satellites.

L3Harris stated that the delivery milestone reflects the growing deployment of secure PNT hardware as operations become more distributed and reliant on reliable navigation and timing data. The company has been involved in GPS modernization efforts for more than four decades, supplying receivers and related technologies for defense platforms and weapons systems. 

The 100,000-unit threshold highlights the scale at which M-Code receivers are now being integrated into operational systems across U.S. and allied forces.

Supporting the MGUE Transition

MGUE Increment 1 focuses on integrating M-Code receivers into existing military platforms, including aircraft, ground vehicles and precision-guided systems.

The transition is part of a broader GPS modernization architecture that includes new satellite generations, upgraded control systems and updated user equipment capable of securely receiving the modernized signals.

Within this architecture, receiver modules such as L3Harris’ TruTrak-M Type II are designed to meet MGUE technical requirements while addressing size, weight, power and cost constraints associated with integration into operational platforms. 

Improving receiver performance and resilience is considered critical as adversaries increasingly deploy electronic warfare capabilities designed to disrupt satellite navigation signals.

Next Phase of GPS Receiver Development

L3Harris said it is continuing development efforts for MGUE Increment 2, which aims to further improve receiver performance and integration flexibility.

The next phase of the program includes development of a new M-Code-capable application-specific integrated circuit (ASIC) and next-generation receiver modules intended to reduce size, weight and power requirements while maintaining security and performance. 

These advances are expected to enable broader integration of secure GPS capability across additional platforms and mission systems.

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At a recent ESA-hosted event, Terry McLarney of Envisage Space and Cranfield University Professor Ivan Petrunin presented the results of the ‘RelyMap Connect’ project, which focused on the needs of micromobility services such as shared e-scooters and bikes. These applications depend on accurate and reliable location information to enforce geofencing rules, manage parking zones and monitor vehicle movements.

Readers will know cities present some of the most challenging conditions for satellite navigation, significantly impacting applications that need reliable location information. RelyMap Connect addressed this challenge using predictive GNSS analytics combined with live measurement data. The system builds on Envisage Space’s RelyMap platform, which uses detailed three-dimensional city models to predict satellite visibility and expected GNSS performance at street level.

Real-time estimation

The new software estimates the expected quality of GNSS positioning in specific locations and time periods. The predictions are then combined with live, multi-constellation GNSS measurements and telemetry from connected devices to assess the reliability of the positioning solution in real time.

Machine-learning techniques are used to fuse predicted signal behavior with GNSS measurements, allowing the system to identify situations where urban signal conditions are likely to degrade positioning performance.

A key output is a ‘confidence factor’ associated with the computed position. This metric provides an indication of how reliable the GNSS solution is under current environmental conditions and can be used to determine whether positioning is sufficiently reliable for operational tasks such as enforcing virtual parking bays or no-go zones.

The project team demonstrated geofence optimization in urban micromobility deployments in several UK cities. By identifying areas where GNSS performance is expected to degrade, operators were able to adjust geofence boundaries or operational rules to improve compliance and reduce false violations caused by positioning errors.

The software operates as a cloud-based analytical platform capable of evaluating GNSS positioning performance across large urban areas, providing a continuously updated view of positioning reliability in complex city environments.

McLarney said the results demonstrated how environmental modeling and data analytics can complement conventional GNSS processing for emerging urban mobility applications. RelyMap Connect partners now plan to engage with micromobility operators, regulators and city authorities to explore commercial deployment of the technology.

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The HydroGNSS mission—ESA’s first Earth Observation “Scout” mission to reach orbit—launched from Vandenberg Space Force Base in California in November 2025 and consists of two small satellites designed to monitor key hydrological and climate variables using signals from global navigation satellite systems (GNSS). 

EECL supplied six multiband ultra-low-noise microwave amplifiers (LNAs) that form part of the radio-frequency front end for the mission’s GNSS reflectometry receiver. The LNAs amplify extremely weak reflected navigation signals while preserving signal integrity, allowing the satellites to capture usable data at the earliest stage of signal reception. 

HydroGNSS uses a technique known as GNSS reflectometry, in which satellites receive navigation signals from systems such as GPS and Galileo after they bounce off Earth’s surface. By analyzing those reflections, the spacecraft can derive environmental measurements including soil moisture, freeze–thaw conditions over permafrost, inundation and wetlands, and above-ground biomass. 

Early commissioning results indicate the payload hardware is performing as expected. Both satellites have successfully begun collecting Delay Doppler Maps—datasets that characterize the reflected GNSS signals and allow scientists to extract environmental information about the reflecting surface. 

The LNAs were designed, manufactured and tested in the United Kingdom under a contract with Surrey Satellite Technology Ltd. (SSTL), which built the satellites and the GNSS receiver payloads. Their in-orbit performance validates the RF hardware after several years of development and space-qualification testing. 

Low-noise amplification is particularly critical for GNSS reflectometry missions because the reflected navigation signals arriving at the satellite are extremely faint compared with direct signals from the GNSS satellites themselves. Maintaining a very low noise figure in the front-end electronics enables the receiver to detect these weak reflections and generate usable scientific data products. 

HydroGNSS will collect global measurements of hydrological conditions to support climate monitoring and environmental research. According to ESA, the twin satellites operate in complementary orbital positions to maximize global coverage while continuously gathering reflected GNSS signals for analysis.

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Organizers and police for Finnmarksløpet, Europe’s longest sled dog race, say ongoing jamming and spoofing are degrading the GPS trackers carried by each team, forcing the event to lean more heavily on trail marking and traditional navigation.

Race tracking hit by jamming and spoofing

According to reporting in the Barents Observer, Norway’s Finnmark police and race officials have confirmed that GNSS disturbances are affecting the race’s live tracking system. Each sled in Finnmarksløpet carries a GPS device so organizers, safety teams, and the public can follow progress across the Finnmark plateau. Military jamming and spoofing from Russia’s Kola Peninsula are now interfering with both reception and transmission of those signals. 

Tarjei Sirma-Tellefsen, Chief of Staff at the Finnmark Police District, said police are in “good dialogue” with the race regarding participant safety but “unfortunately see GNSS disturbances occurring in the area.” In practice, that can cause sled positions to freeze, jump erratically, or appear in the wrong place altogether on the public map.

The race route runs from Alta east across the Finnmark plateau to Kirkenes, near the Russian border, and back again. Portions of the course follow the Pasvik valley along the western shore of the river that separates Norway from Russia’s Kola Peninsula – placing mushers and their GPS equipment squarely inside a region that has seen repeated interference over the past several years. 

Part of a broader High North interference pattern

Finnmarksløpet is the latest in a series of civilian activities in Norway’s far north affected by Russian GNSS interference.

Norwegian authorities first reported systematic jamming impacting aviation and other GPS users in eastern Finnmark in 2017. District police at the time described outages as frequent enough to be considered “the new normal,” requiring long-term planning for degraded GPS. 

Since then, pilots approaching Kirkenes and other northeastern airports have reported near-daily GNSS interference, with signals distorted or lost on approach and alternative navigation systems such as inertial and ground-based aids used as primary references. 

Further south, Finland and Estonia have issued navigation warnings for the Gulf of Finland due to persistent GNSS disruption traced to Russian and Belarusian territory, citing increased risk to shipping and a need for mariners to treat satellite navigation with caution. 

Taken together, the incidents show a broad arc of GNSS interference stretching from the Arctic High North down into the Baltic – with the dog-sled race now providing a very public, human-scale illustration of the problem.

A live test of “everyday” PNT resilience

Finnmarksløpet is a reminder that satellite navigation is now embedded in activities far beyond aviation, shipping, or defense.

In this case:

• Each team’s GPS tracker underpins safety monitoring, media coverage, and fan engagement.
• Organizers, rescue teams, and family members rely on those positions to confirm that mushers and dogs are on course and moving as expected in harsh winter terrain.
• When jamming or spoofing degrades those signals, race control has to fall back on more traditional tools: marked trails, checkpoints, radio communications, and map-and-compass navigation for participants. 

From a PNT resilience standpoint, the situation checks several familiar boxes:

• Single-sensor dependence: GPS trackers are often built around L1-only receivers with limited interference detection.
• Lack of redundancy: consumer-grade tracking platforms may not fuse inertial sensors, terrestrial beacons, or multi-constellation, multi-frequency GNSS in ways that help detect spoofing or jamming.
• Human expectations: fans and even some safety stakeholders may assume that a public tracking map is authoritative, when in fact it may be running on degraded or manipulated data.

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The new model is aimed at precision agriculture, survey, marine, machine control and fixed-reference installations.

The A65 combines a Calian-engineered stacked-patch quad-feed antenna element and RF front end with Hemisphere’s application-level integration and field validation. It is built to deliver tighter multipath suppression, consistent phase-center variation and tracking across GPS L1/L2/L5, Galileo E1/E5/E6, BeiDou B1/B2/B3, GLONASS G1/G2/G3, NavIC L5, QZSS and L-band correction services, while reducing power consumption compared to its predecessor. 

XF Filtering for interference-heavy environments

A key change from the A45 is the integration of Calian’s XF Filtering technology at the antenna level. The filtering is designed to reject out-of-band energy before it reaches downstream receiver electronics, targeting interference from 4G/5G cellular, Ligado and adjacent-band emitters, broadband marine and aviation systems, and dense urban RF noise. 

By pushing more of the interference-mitigation burden into the antenna and low-noise amplifier stage, Hemisphere and Calian are positioning the A65 for GNSS operations in increasingly congested and contested RF environments where legacy antennas can struggle to maintain clean signal quality.

Drop-in mechanical replacement for A45

To ease adoption, the A65 retains the same mechanical footprint, connector location and mounting configuration as the A45, allowing existing users to upgrade without hardware redesign. At the same time, the new model adds:

• Expanded GNSS band coverage
• Integrated XF Filtering
• Improved noise figure with 2.5 dB NF and 28–30 dB gain
• Lower power draw and broader voltage compatibility 

Ruggedization features include IP69K environmental protection, a high-impact LEXAN radome, robust metallic base, 15 kV ESD protection and an operating range from –40°C to +85°C, reflecting its intended use on agricultural machinery, construction equipment, workboats and permanent reference stations. 

OEM and embedded options

The A65 is available now through Hemisphere’s channels. For integrators that need embedded solutions rather than a finished antenna, OEM module versions based on the same Calian-engineered design are also being offered. 

As a subsidiary of CNH Industrial, Hemisphere is positioning the A65 as a straightforward path for existing A45 users to gain wider multi-constellation support and stronger front-end interference protection, while maintaining compatibility with current installations.

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The announcement positions the modules as building blocks for European and allied OEMs that want tighter control over their navigation supply chains while leveraging Galileo’s Open Service (OS) and Public Regulated Service (PRS). 

Sovereignty and resilience as design drivers

On the sovereignty side, the Galileo PRS core module is explicitly aimed at EU companies seeking a standardized way to embed PRS into their own receivers, rather than buying complete black-box units. The module’s small footprint (on the order of a few inches square), low weight (around 50 g) and sub-2 W power consumption are intended to make it practical across aircraft, helicopters, drones, missiles and surface platforms. 

On the resilience side, the TopStar line builds on work Thales highlighted in 2025, when it reported what it called a world first: a satellite-positioning solution combining real signals from two military constellations—Galileo PRS and GPS M-code—within a single receiver (TopStar M), further hardened by the TopShield anti-jamming front end. The new Galileo core modules can be read as an effort to push that architecture deeper into the supply chain, allowing more integrators to field receivers that fuse multiple secure services and front-end protection.

Target markets: from cockpits to weapons and critical infrastructure

The likely near-term adopters include:

• Avionics and mission-system integrators needing Galileo-capable, PRS-ready PNT for new or upgraded cockpits;
• Defense primes retrofitting existing platforms with more resilient GNSS front ends to cope with contested RF environments;
• Critical-infrastructure vendors (e.g., timing and sync systems) in markets where regulators are pushing for multi-constellation, sovereign PNT options.

Because the modules are meant to be embedded, they also fit into a larger European trend toward modular, common-core electronics that can be reused across programmes while meeting export-control and security-accreditation requirements.

With French accreditation already in place for the PRS security ASIC and decades of operational use behind the broader TopStar family, Thales is positioning these modules as a mature, defense-grade option for OEMs that want Galileo inside their next generation of receivers—without ceding control of the rest of the stack.

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The GAJT-AE3 is the latest addition to the company’s GNSS Anti-jam Antenna Technology lineup. The product is positioned for airborne applications operating in increasingly contested spectrum environments, where lower-cost and more capable jammers are targeting a wider range of frequencies used for positioning, navigation and timing.

According to the company, the GAJT-AE3 is the first anti-jam product in its class to provide full multi-constellation, multi-frequency coverage across major GNSS signals. That broader signal protection is intended to help aircraft and other platforms maintain PNT availability even as interference techniques become more sophisticated and harder to avoid through conventional approaches.

The system’s antenna electronics mitigate interference by forming up to seven nulls per band in the direction of detected jammers. NovAtel said that capability is designed to improve survivability in dynamic multi-jammer conditions while also supporting jammer direction finding for greater situational awareness.

Rather than outputting navigation data directly, the GAJT-AE3 delivers a protected RF signal that can feed both modern and legacy GNSS receivers. That architecture may ease integration for operators looking to improve resilience without redesigning downstream receiver systems.

NovAtel also said the unit supports all GNSS frequencies as well as L-band corrections and Iridium PNT. The company is targeting a range of airborne and defense applications, from unmanned aircraft to more complex weapon systems, where size, weight and integration constraints can limit the use of larger assured-PNT hardware.

In a statement, Stig Pedersen, president of Hexagon’s Aerospace & Defence division, said the new system is intended to extend the company’s anti-jam portfolio for platforms where space is limited while increasing both signal coverage and multi-jammer awareness.

The GAJT-AE3 can be paired with antennas from Hexagon | Antcom’s portfolio, with custom antenna options also available. NovAtel said the system is now commercially available.

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