Terrain Awareness Patents: Who Leads, Where the Gaps Are 2026
- 89.7% concentration. The top 5 of 44 ranked assignees hold 608 of 678 records in scope — a field with almost no open middle tier.
- Filings down 57%. Filing activity fell from 21 in 2021 to 9 in 2024, the last year the trend can be read as complete.
- Navigation, not alarms, dominates the claims. G01C distance/navigation classes cover 59.4% of records, more than double the 11.5% carrying explicit alarm-system (G08B) claims.
Filing growth compares 2021 (21 records) with 2024 (9) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 678 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Terrain awareness and warning systems (TAWS) combine terrain databases, geometric altitude, and closure-rate logic to warn flight crews before controlled flight into terrain occurs. This landscape covers 678 published records filed or published between 2015 and mid-2026, drawn from claims referencing terrain databases, pull-up alerts, terrain clearance floors, premature descent alerts, and related nuisance-suppression logic. The scope spans both fixed-wing avionics and marine hazard-alerting variants of the same underlying geometric-alert architecture.
The dataset skews heavily toward one incumbent filer and a handful of long-standing avionics suppliers, with a long tail of single- or few-filing entrants. Because publication lags filing by roughly 18 months, the 2025-2026 figures in any trend understate current activity and should not be read as a slowdown on their own.
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Filing trend and technology composition
Two views of the same 678-record dataset: how filing activity has moved year over year, and which IPC subclasses carry the underlying claims.
Filing trend, 2017-2026
Filings peaked at 31 in 2017 and have declined since, falling from 21 in 2021 to 9 in 2024 — a 57% drop over that span. 2025 and 2026 figures are still filling in due to publication lag and should not be read as continued decline.
Technology composition by IPC subclass
G01C (distance, navigation and gyroscopes) appears on 59.4% of records and G08G (traffic control systems) on 50.0%, confirming that most claims sit in navigation and positioning logic rather than dedicated alarm hardware. Records can carry multiple IPC classes, so these shares sum to well over 100%.
Shares are the percentage of the 678 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Terrain Awareness and Warning Systems with Eureka
This page is one run against one query. Ask Eureka your own question about terrain awareness and warning systems and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in the field
US6785594B1 — Ground proximity warning system and method having a reduced set of input parameters
The ground proximity warning system and method provide a number of alerts based upon a substantially reduced list of input parameters relative to a conventional ground proximity warning system and method. The system constructs alert envelopes and generates alerts if upcoming terrain or obstacles pierce those envelopes, including alerts for excessive descent rate at low altitude and descent immediately following takeoff.Filed by Honeywell International, this record illustrates the reduced-parameter alert-envelope approach that underlies much of the modern TAWS claim space.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6469664B1 | Method, apparatus, and computer program products for alerting surface vessels to hazardous conditions | 213 |
| 2 | US6216064B1 | Method and apparatus for determining altitude | 203 |
| 3 | US20040044446A1 | Avionics system for determining terminal flightpath | 139 |
| 4 | US9734723B1 | Process and system to register and regulate unmanned aerial vehicle operations | 131 |
| 5 | US20050200501A1 | Aircraft boundary transition warnings and auto alerting | 119 |
| 6 | US6002347A | Integrated hazard avoidance system | 115 |
| 7 | US3946358A | Aircraft ground proximity warning instrument | 113 |
| 8 | US4675823A | Ground proximity warning system geographic area determination | 109 |
| 9 | US6127944A | Integrated hazard avoidance system | 105 |
| 10 | US6711479B1 | Avionics system for determining terminal flightpath | 102 |
Citation counts reflect influence within the searched corpus and favour older filings; they are not a measure of current commercial importance.
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Three patterns stand out once the filing trend, the assignee concentration, and the IPC composition are read together.
One filer sets the terms of the field
With a single leader holding 458 of 678 records and the top five combined at 608, most of the claim space in geometric-altitude and terrain-clearance-floor logic is already staked out by one incumbent. New entrants filing head-on into pull-up-alert or closure-rate claims are filing into dense prior art held by a very small group.
Activity has cooled from its 2017 peak
Filings peaked at 31 in 2017 and have fallen steadily through the last complete year on record. That decline says more about claim space already being occupied in the core alert-envelope architecture than about the underlying technology losing relevance — TAWS remains a mandated system on commercial aircraft.
Claims cluster in navigation logic, not alarms
G01C and G08G together dominate the composition, while G08B (dedicated alarm/signalling) sits at just 11.5%. Most inventive activity is in how terrain position and closure geometry are computed and classified, not in how the resulting warning is presented to the crew.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to terrain awareness and warning systems, with the prior art for and against each one.
Who is filing, and where the field is still open
The ranked leaders account for nearly all activity in scope, but the composition data points to sub-areas that remain lightly claimed relative to the core alert-envelope architecture.
A single dominant filer
The top-ranked assignee holds well over half of all records in scope, spanning decades of alert-envelope and terrain-database refinement. Its recent-year filing rate has flattened to a single digit, consistent with the broader field-wide decline rather than a company-specific pullback.
A thin middle tier
Below the top five, filing counts drop sharply — fifth place sits at 15 records and tenth place at just 6. That gap signals limited competitive contestation of the core claims once past the leading group of avionics suppliers.
Co-invention is narrow and repeat
Co-assignee activity is limited to ten identified pairs, with the strongest pairings repeating across the same small group of named inventors. This points to internal cross-team collaboration within incumbents rather than cross-company joint filing.
| Assignee | Recent year | YoY |
|---|---|---|
| Honeywell International Inc | 1 | 0% |
| Sundstrand Data Control Inc | 0 | — |
| Gulfstream Aerospace Corp | 0 | — |
| AVIATION COMMUNICATION & SURVEILLANCE SYSTEMS LLC | 0 | — |
| Universal Avionics Systems Corp | 0 | — |
| STM SAVUNMA TEKNOLOJILERI MUHENDISLIK VE TICARET ANONIM SIRKETI | 0 | — |
| FLIR Systems Trading Belgium BVBA | 0 | — |
| The Boeing Co | 0 | — |
Where to take this analysis
The dataset points to a field with dense claims at the core and thinner coverage at the edges. Two directions follow from that.
Map the incumbent's claim boundaries in detail
With one filer holding 89.7% of records among the top five, a claim-by-claim review of its alert-envelope and reduced-parameter patents is the first step before designing around the core logic.
Explore claim charts in EurekaTrack the under-claimed branches
Marine hazard-alerting variants and UAV closure-rate detection sit outside the dense core and show lighter filing density — worth monitoring for freedom-to-operate before the leading filers extend into them.
Set up monitoring in EurekaCommon questions about TAWS patents
One assignee holds the large majority of records in scope, with 458 of the 678 records tracked in this dataset. The next four ranked assignees bring the top-five combined total to 608 records, or 89.7% of all records in scope. Below that group, filing counts drop off quickly, with the tenth-ranked assignee holding only 6 records, so the field is best described as dominated by a single incumbent supported by a small group of established avionics suppliers rather than broadly contested.
Filing activity has declined from a peak of 31 records in 2017 to 9 in 2024, a fall of 57% between 2021 and 2024 alone. That said, publication typically lags actual filing by around 18 months, so the 2025 and 2026 figures in the dataset are still incomplete and should not be read as evidence the technology itself is losing relevance. TAWS remains a mandated safety system on commercial aircraft, so the decline more likely reflects that core alert-envelope claim space is already well occupied.
US6785594B1, assigned to Honeywell International, describes a ground proximity warning system that generates alerts from a reduced set of input parameters compared to conventional systems, using alert envelopes pierced by upcoming terrain or obstacles. It also covers alerts for excessive descent rate at low altitude and for descent immediately following takeoff. Because it simplifies the input parameter set while preserving the core alerting logic, it is a foundational reference point for anyone designing a competing or complementary ground proximity warning architecture, and any new design should be checked against its specific claim language on parameter reduction.
The IPC composition shows that navigation and positioning claims (G01C, 59.4% of records) and traffic control claims (G08G, 50.0%) dominate, while marine hazard-alerting (B63B, 4.1%) and dedicated alarm-signalling (G08B, 11.5%) carry comparatively few records. Nuisance alert suppression, geometric altitude fusion, and closure-rate detection tailored to unmanned aerial vehicles also show thinner representation relative to the core alert-envelope claims. These lower-density branches are worth a closer freedom-to-operate review before committing to a specific claim strategy.
This field shows unusually high concentration: the top five of 44 ranked assignees account for 89.7% of all 678 records, and the top ten account for 96.6%. That leaves very little filing activity distributed among the remaining 34 ranked assignees, let alone unranked single-filing entrants. Practically, this means new entrants are more likely to encounter dense prior art from a small number of incumbents than from a broad competitive field, which should shape both claim drafting and freedom-to-operate searches.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.