Alternative Positioning Systems: Beyond GPS in Ukraine's War Environment
The pervasive GNSS jamming and spoofing environment of the Russia-Ukraine conflict has accelerated experimentation with and deployment of alternative and complementary positioning technologies. None of these alternatives fully replaces GPS in terms of global coverage, continuous availability, and sub-meter accuracy—but each addresses specific scenarios where GPS is unavailable or compromised, and combinations of multiple systems provide resilience that no single technology can achieve alone. Ukraine's operational experience is providing real-world validation data for positioning technologies that were previously evaluated primarily in controlled testing environments.
Terrain-Following and Visual Navigation
Terrain correlation navigation—matching continuously measured terrain profiles against pre-loaded digital elevation databases—provides position fixing capability that is entirely passive and immune to GNSS denial. TERCOM (Terrain Contour Matching) has been used in Western cruise missiles since the 1980s and provides position accuracy of 50-100 meters, sufficient for general navigation and as a navigation monitor to detect gross GNSS spoofing. Visual-based navigation using optical cameras to match real-time imagery against geo-referenced satellite imagery databases (Digital Scene Matching Area Correlator, DSMAC) provides terminal guidance accuracy of 5-10 meters.
Ukraine's domestically developed long-range strike drones, including the Lyuty and Baba Yaga heavy drones developed for long-range missions, have incorporated optical and terrain correlation navigation as primary or backup navigation to address the GPS-denied environment. The limiting factor is pre-loading of digital elevation and imagery databases for the intended mission area—requiring intelligence preparation and mission planning time that tactical GPS-only navigation does not require.
eLoran Revival
eLoran (enhanced Long Range Navigation) is a modern ground-based radio navigation system operating in the 90-110 kHz spectrum that provides positioning accuracy of 10-30 meters at ranges up to 1,500 km from shore-based transmitters. eLoran is a candidate for GNSS backup because its powerful ground-wave signals in low frequency spectrum are extremely difficult to jam (requiring jammers of impractical scale) and are immune to the space-segment denial risks that theoretically affect satellite-based systems. The International Loran Association and several national authorities have advocated eLoran revival as critical national infrastructure backup for GNSS failure scenarios.
As of 2025, the United Kingdom operates an eLoran test infrastructure designed for potential national rollout, South Korea operates the largest operational eLoran system providing national GNSS backup for its critical infrastructure following North Korean GPS jamming incidents, and the United States maintains obsolete LORAN-C transmitter infrastructure that could potentially be revived as eLoran with investment. Ukraine does not have eLoran coverage from existing stations, but the European eLoran network under development would provide partial coverage that could benefit Ukrainian navigation resilience if expanded transmitter sites are established in Central Europe.
Alternative Positioning Technologies Comparison
| Technology | Position Accuracy | Coverage Area | Jamming Resistance | Infrastructure Cost |
|---|---|---|---|---|
| GNSS (GPS/Galileo) | 3-5 m | Global | Low (without military signals) | None (user side only) |
| eLoran | 10-30 m | Regional (transmitter-dependent) | Very High | High (transmitter network) |
| TERCOM terrain correlation | 50-100 m | Pre-loaded area only | Full | Medium (database prep) |
| Visual/DSMAC | 5-10 m terminal | Terminal phase only | Full | Medium (imagery prep) |
| Celestial navigation | 1-2 km (manual) / 50m (auto) | Global (clear sky required) | Full | Low-Medium |
Automated Celestial Navigation
Star tracker navigation—using an autonomous star-tracker camera to determine position and attitude from stellar observations—was historically used in ballistic missiles and is now deployed in some military UAVs and submarines. Modern COTS star tracker units have reduced in size, cost, and power consumption to the point where integration into medium and large UAVs is feasible. Star trackers provide absolute navigation independent of any ground infrastructure or radio signals, deriving position from the observed positions of celestial bodies. Performance is limited by weather (requiring clear sky conditions), by position accuracy achievable from celestial geometry (improving toward 50-100 meters with high-precision trackers), and by the additional payload weight and complexity.
US military UAVs including the RQ-4 Global Hawk have used stellar-inertial navigation for decades. Technology transfer and commercial development have brought smaller star tracker units to market, and Ukraine has evaluated celestial navigation backup as a component for premium long-range strike and reconnaissance drone applications where payload capacity permits the added system complexity.
Underwater Acoustic Positioning
Acoustic positioning systems use time-of-arrival measurements of acoustic signals between transponders to derive underwater position—the primary positioning technology for underwater vehicles, offshore drilling, and submarine systems where GNSS signals do not penetrate water. Long Baseline (LBL) acoustic systems provide centimeter-level accuracy over areas of several kilometers using precisely surveyed bottom transponder arrays. Ultra-Short Baseline (USBL) systems provide positioning from a single transducer on a surface vessel. For Ukrainian naval operations in the Black Sea and inland waterways, acoustic positioning has operational relevance for underwater drone navigation where GNSS signals are either unavailable (underwater) or jammed at the surface.
FAQ
- Why hasn't eLoran been widely deployed as GPS backup despite its technical advantages?
- eLoran deployment has been repeatedly delayed by a combination of political and economic factors: governments that have invested in existing GNSS infrastructure have been reluctant to fund parallel terrestrial infrastructure when GNSS operational availability remains high; LORAN transmitters are expensive to build and operate; spectrum management issues have complicated low-frequency spectrum use; and some maritime nations have shutting down the older LORAN-C networks before eLoran replacements were funded. The GPS jamming incidents around Ukraine have reinvigorated serious policy consideration of eLoran in Europe, and several position papers from European navigation authorities recommend resumed investment.
- Can smartphones be programmed to use alternative navigation in GPS-denied environments?
- Modern smartphones include multiple positioning technologies beyond GPS: cellular network-based positioning (using Cell ID and RSSI triangulation), Wi-Fi positioning (using Wi-Fi radio mapping databases), Bluetooth beacon positioning (in equipped indoor environments), barometric altitude from built-in sensors, and MEMS INS from accelerometers and gyroscopes. In GPS-denied outdoor environments with cellular coverage, smartphones typically fall back to cell-based positioning with accuracy of 50-300 meters. Without cellular coverage, MEMS INS dead reckoning provides short-period positioning with rapid drift. Apps like Organic Maps that cache offline maps and can use dead reckoning are recommended for users in GNSS-denied environments.
- How does optical flow navigation on drones compare to GPS accuracy?
- Optical flow navigation measures camera frame-to-frame pixel displacement to compute velocity and position change, providing hover stability in GPS-denied environments but accumulating position drift over distance similar to INS. Commercial drone optical flow sensors (used in DJI indoor positioning) provide excellent hover stability within a few centimeters at low altitude but accumulate position errors of several meters over minutes of flight. GPS-independent optical flow is practical for short-range tactical UAVs operating in visually distinct terrain at low altitudes; for longer-range or featureless terrain applications, it cannot stand alone but contributes to blended navigation algorithms.
- What does South Korea's eLoran network demonstrate about the technology?
- South Korea's national eLoran network, deployed and operational since 2019 following North Korean GPS jamming incidents that disrupted Korean civil aviation and maritime operations, demonstrates that eLoran can be built, certified, and operated at national scale with integration into civil maritime and aviation operations. Korean eLoran achieves approximately 20-meter accuracy in service areas, adequate for maritime harbor approach and en-route navigation. The Korean system serves as proof of concept for European revival discussions and provides operational data on infrastructure costs, maintenance requirements, and integration with existing navigation equipment infrastructure.
- What is the most realistic near-term alternative positioning solution for Ukrainian military UAVs?
- The most realistic near-term solution for Ukrainian military UAV navigation resilience is integration of terrain correlation navigation (using digital elevation models from publicly available sources including SRTM data) with continued GNSS but with spoofing detection algorithms that detect inconsistency between GNSS-reported position and terrain elevation profile. This approach adds navigation robustness without requiring new physical infrastructure or exotic hardware, uses freely available terrain databases, and can be implemented in firmware updates to existing navigation computers. It directly addresses the most common spoofing attack pattern (large discrete position jumps) while providing backup capability during periods of outright jamming.
Sources
- International Loran Association — "eLoran Definition Document and GNSS Backup Case," loran.org 2023
- Korea Radio Promotion Association — "Korea eLoran Service Characteristics," 2021
- European Commission — "EU Space Programme: Alternative Navigation PNT Study," euspa.europa.eu 2022
- Dana, Peter H. — "Terrestrial Radionavigation Systems," GPS World supplementary reference
- US DHS — "Complementary PNT and GPS Back-up Technologies Demonstration Report," dhs.gov 2021
Cyber Operations Analysis: Alternative Positioning Systems: Beyond GPS in Ukraine's War Environment
The Russia-Ukraine conflict has generated the most comprehensively documented state-sponsored cyber operations in history, with Alternative Positioning Systems: Beyond GPS in Ukraine's War Environment representing a significant dimension of this digital warfare environment. Cyber attacks have targeted Ukrainian government systems, critical infrastructure, financial institutions, and military communications since well before the physical invasion began in February 2022. Understanding the technical characteristics, attributable actors, and strategic effects of cyber operations related to Alternative Positioning Systems: Beyond GPS in Ukraine's War Environment provides essential context for assessing both immediate operational impacts and broader implications for cyber conflict doctrine.
Russian state-sponsored threat actors including Sandworm (GRU Unit 74455), APT28/Fancy Bear (GRU Unit 26165), Cozy Bear/APT29 (SVR), and Turla (FSB) have conducted sustained campaigns against Ukrainian and allied targets with objectives spanning espionage, sabotage, and influence operations. Alternative Positioning Systems: Beyond GPS in Ukraine's War Environment intersects with this threat actor ecosystem in specific ways, whether through the deployment of particular malware families, targeting of specific sectors, or employment of novel techniques that reveal evolving adversary capabilities and intentions.
Ukraine's cyber defense architecture, significantly strengthened with Western assistance through programs including the EU's Cyber Resilience for Ukraine project and bilateral cooperation with US Cyber Command, has demonstrated growing resilience against Russian operations. The Ukrainian Computer Emergency Response Team (CERT-UA) has published hundreds of threat intelligence advisories, contributing to global understanding of Russian cyber tactics, techniques, and procedures (TTPs). Alternative Positioning Systems: Beyond GPS in Ukraine's War Environment informs this evolving defensive picture, highlighting areas where Ukrainian defenses have proven effective and where vulnerabilities remain.
The strategic calculation surrounding cyber operations related to Alternative Positioning Systems: Beyond GPS in Ukraine's War Environment involves complex trade-offs between operational effect, attribution risk, and escalation management. Russia's decision to employ destructive wiper malware, distributed denial-of-service attacks, and infrastructure-targeting operations reflects a calibrated use of cyber as a coercive instrument alongside physical military operations. The international response—including intelligence sharing, cyber defense assistance, and potential offensive cyber operations by allied nations—shapes the cost-benefit calculations of Russian cyber strategists.
Lessons for Global Cybersecurity Policy
The cyber dimensions of the Russia-Ukraine conflict represented by Alternative Positioning Systems: Beyond GPS in Ukraine's War Environment have generated critical lessons for national cybersecurity strategies worldwide. The importance of pre-positioning defensive measures before conflict onset, the value of international cyber defense cooperation frameworks, the role of private sector cybersecurity companies in supporting national defense, and the limitations of cyber operations as a strategic coercive tool have all been illuminated by Ukrainian experience. These lessons are reshaping cybersecurity investment priorities, information sharing architectures, and incident response frameworks across NATO and partner nations.
Frequently Asked Questions
What are the main Russian cyber attacks on Ukraine?
Russia has conducted sustained cyber operations against Ukraine since at least 2014, with a major escalation in February 2022. Key campaigns include the NotPetya attack (2017), attacks on energy infrastructure, the Viasat hack at war's start, and continuous operations against government, military, and civilian targets throughout the full-scale invasion.
How has Ukraine defended against Russian cyber attacks?
Ukraine's cyber defense has benefited from pre-invasion preparation, Microsoft and Western tech company assistance, CERT-UA operations, and the support of allied intelligence services. Ukraine developed significant cyber resilience by distributing government data to cloud infrastructure before the invasion.
What is the role of cyber warfare in the Ukraine conflict?
Cyber warfare in the Ukraine conflict operates alongside conventional military operations. Russia uses cyber attacks to disrupt infrastructure, spread disinformation, and support physical strikes, while Ukraine has developed offensive cyber capabilities to target Russian systems, including oil and gas infrastructure and military networks.
Who are the main cyber actors targeting Ukraine?
Russian state-affiliated cyber groups targeting Ukraine include Sandworm (GRU), APT28 (GRU), APT29 (SVR), Turla (FSB), and various GRU units. Ukrainian cyber forces, international volunteer hacker groups (IT Army of Ukraine), and allied intelligence cyber units operate on the Ukrainian side.
What can other countries learn from Ukraine's cyber defense?
Ukraine's cyber defense offers critical lessons: distributed cloud infrastructure reduces vulnerability to physical and cyber attacks, international information sharing accelerates threat response, pre-conflict preparation matters enormously, and the integration of civilian tech expertise with military cyber operations creates strategic advantages.