GNSS Timing Patents: Who Leads, Where the Gaps Are 2026
- Concentration at the top. the leading five assignees combined hold 42.9% of all 497 records in scope, and the leading ten hold 55.1% — a narrow group of filers controls most of the claim space.
- Filing has cooled from its 2023 peak. activity peaked at 30 records in 2023, and the 2021→2024 span shows a -19% change, though 2025-2026 counts are still filling in under publication lag.
- Positioning and wireless classes dominate. G01S (positioning) touches 41.0% of records and H04W (wireless networks) 33.2%, showing timing claims are filed as network and positioning inventions, not standalone clock hardware.
Filing growth compares 2021 (16 records) with 2024 (13) — 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 497 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
GNSS timing and frequency distribution sits at the intersection of satellite positioning, network synchronisation and precision oscillator design. The corpus in scope combines terms like disciplined oscillator, pulse per second, holdover stability and leap second handling with GNSS timing receiver and time-transfer language, capturing inventions that keep networks, financial systems and telecom infrastructure synchronised when satellite signal is degraded or absent. The 497 records in scope span filings from 2015 through the current data cut-off.
Most of this activity is filed by telecom equipment makers, chipset vendors and specialist timing-hardware firms rather than pure GNSS chipmakers, reflecting that holdover and time-transfer patents are as much about network resilience as satellite reception.
Filing trend and technology composition
Two views of the same 497 records: how filing volume has moved year over year, and which IPC subclasses carry the claim weight.
Filing trend, 2017-2026
Filing rose from 19 records in 2017 to a peak of 30 in 2023. The 2021-to-2024 window shows a -19% change (16 to 13 records), and 2025-2026 figures will rise as publications still under the roughly 18-month filing-to-publication lag come through — they should not be read as a real decline yet.
IPC subclass composition
G01S (radar, sonar & positioning) touches 41.0% of the 497 records and H04W (wireless communication networks) 33.2%, with H04B transmission hardware at 30.8% and H04L digital transmission at 26.2%. Dedicated clock and timepiece classes G04G and G04R sit far lower, at 9.9% and 3.8% respectively — a strong signal that most timing inventions are claimed inside a wireless or positioning system rather than as standalone oscillator hardware.
Shares are the percentage of the 497 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on GNSS Timing and Frequency Distribution with Eureka
This page is one run against one query. Ask Eureka your own question about gnss timing and frequency distribution and every answer comes back with the patent numbers behind it.
Try EurekaA representative filing and the most-cited prior art
High-reliability holdover method and topologies
Covers a clock system disciplined to an external reference, combining a flywheel oscillator controlled by that reference with a free-running holdover oscillator that maintains accuracy once the reference signal is lost. A phase-locked loop taking the holdover oscillator's frequency as input adds a further control layer, with a switch that falls back to analog control if the loop faults.US9979406B2 — Arbiter Systems, Incorporated — published 2018-05-22
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20120182180A1 | Wide area positioning system | 274 |
| 2 | US8130141B2 | Wide area positioning system | 216 |
| 3 | US20100073229A1 | Wide Area Positioning System | 202 |
| 4 | US4797677A | Method and apparatus for deriving pseudo range from earth-orbiting satellites | 196 |
| 5 | US20090276542A1 | Method and apparatus for time and frequency transfer in communication networks | 184 |
| 6 | US6538615B1 | Semi-coaxial horn antenna | 140 |
| 7 | US6937667B1 | Apparatus, system and method for flip modulation in an impulse radio communications system | 138 |
| 8 | US20110261917A1 | Time Synchronization Using Packet-Layer and Physical-Layer Protocols | 120 |
| 9 | US20130057436A1 | Coding in a wide area positioning system (WAPS) | 112 |
| 10 | US7142154B2 | Time and frequency synchronizations of equipment at different locations | 106 |
Citation counts favour older filings within this searched corpus and should be read as a signal of influence, not current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three findings that change where a new application should be aimed, and how much weight the most-cited prior art should carry.
A narrow group controls the core claim space
The leading five assignees combined hold 42.9% of all 497 records, rising to 55.1% across the leading ten. New entrants filing squarely on disciplined-oscillator or GNSS-timing-receiver claims are filing against a crowded top tier, not an open field.
Timing claims travel inside positioning and network filings
Only 9.9% of records sit in G04G (electronic clocks & watches) and 3.8% in G04R (radio-controlled timepieces), while G01S and H04W each cover roughly a third or more of records. Claim drafting that frames an invention purely as clock hardware misses where the density actually sits.
Volume has eased from its 2023 peak, not collapsed
Filing peaked at 30 records in 2023 after rising steadily from 2017. The 2021-2024 comparison shows a -19% change, and because 2025-2026 data is still filling in under publication lag, that easing should not be read as an exit signal yet.
The oldest, most-cited prior art sets the reference frame
The most-cited record in this set, on wide-area positioning system architecture, carries 274 citations — well ahead of the rest of the cited set. High citation counts here reflect age and foundational reach within the searched corpus, not that the underlying approach is still the state of the art.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to gnss timing and frequency distribution, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranking covers 100 companies counted by records in scope — the full set the data endpoint returns, not a top-50 or top-100 cut. Recent-year momentum figures show several leading filers dropping to zero or near-zero in the latest year, though that is consistent with publication lag rather than withdrawal.
One filer sits well ahead of the rest
The leading assignee holds 114 records, more than five times the fifth-place count of 20. That gap suggests the leader has built a broad portfolio across multiple timing sub-areas rather than a narrow set of core patents.
A tighter cluster forms behind the leader
Fifth place holds 20 records and tenth place 10, a much shallower drop-off than the gap to the leader. This mid-tier band is where competitive filing pressure is most direct, since portfolio sizes are close enough that a handful of grants can shift rank.
Co-filing is concentrated around a small inventor cluster
Only ten co-assignee pairs appear in this landscape, and the strongest pairing recurs across multiple filings with the same lead inventor. That points to a small internal team driving a disproportionate share of one company's output rather than broad cross-company collaboration.
| Assignee | Recent year | YoY |
|---|---|---|
| NextNav LLC | 1 | -75% |
| LOGOS SPACE SERVICES INC | 1 | -93% |
| Comcast Cable Communications, LLC | 0 | — |
| RAGHUPATHY ARUN | 0 | — |
| Qualcomm Incorporated | 0 | -100% |
| Aviat Networks, Inc. | 0 | — |
| Time Domain Corporation | 0 | — |
| Deutsche Telekom AG | 0 | — |
Where to take this analysis
The dataset points to a few concrete next steps depending on whether the goal is defensive clearance or new filing strategy.
Map claims against the leading five assignees
With 42.9% of records held by five filers, a freedom-to-operate check should start there before broadening to the long tail of single-filing entrants.
Explore assignee portfolios in Eureka →Pressure-test white space in under-claimed IPC classes
G04G and G04R sit far below G01S and H04W in record share, which is worth checking against actual claim language rather than class counts alone.
Run a white space search in Eureka →Track the most-cited prior art's actual claim scope
High citation counts on older wide-area positioning filings reflect corpus age, not current enforceability — worth reading the claims directly rather than relying on citation rank.
Read full claim sets in Eureka →Common questions on GNSS timing patents
The leading assignee in this dataset holds 114 of the 497 records in scope, well ahead of the fifth-ranked filer at 20 and the tenth at 10. The leading five assignees together hold 42.9% of all records, and the leading ten hold 55.1%, so filing is concentrated in a narrow group at the top with a long tail of smaller filers below. Anyone assessing freedom to operate should check that top group's portfolios first before widening the search.
Filing rose from 19 records in 2017 to a peak of 30 in 2023, then the 2021-to-2024 comparison shows a -19% change. Because publication lags filing by roughly 18 months, the 2025 and 2026 figures in any chart are still incomplete and will rise as more filings publish, so this should be read as an easing from a 2023 peak rather than a confirmed decline. Treat any conclusion drawn from the last one to two years with caution.
G01S, covering radar, sonar and positioning, appears in 41.0% of the 497 records in scope, and H04W, wireless communication networks, appears in 33.2%. Transmission-related classes H04B and H04L follow at 30.8% and 26.2%. Dedicated clock and timepiece classes G04G and G04R are much smaller at 9.9% and 3.8%, showing that most timing inventions are claimed as part of a positioning or communications system rather than as standalone oscillator hardware.
US9979406B2, assigned to Arbiter Systems and published 2018-05-22, covers a clock disciplined to an external reference with a flywheel oscillator paired to a free-running holdover oscillator, plus a phase-locked loop using the holdover oscillator's frequency as input and a fault-triggered switch to analog control. It blocks that specific combination of flywheel-plus-holdover-plus-PLL-fault-switch architecture, not every holdover approach. Designs using different disciplining topologies, or without the analog fallback switch, sit outside its literal claim scope, though a full claim chart is needed to confirm design-around viability.
The class-level data points to leap second handling, radio-controlled timepiece synchronisation under G04R, and multiplex-based time distribution under H04J as comparatively under-claimed relative to the dominant G01S and H04W classes. These are not guarantees of open space, since claim language can still overlap across classes, but the lower record density in those subclasses makes them worth checking first for a first-mover filing. A prior-art search focused specifically on those subclasses, rather than the corpus as a whole, is the practical next step.
The United States leads with 237 filings in this dataset, followed by the European Patent Office at 57 and WIPO PCT filings at 46. India, Australia and China each show smaller but notable counts at 25, 22 and 21 respectively. This distribution suggests the US is the primary battleground for enforcement and clearance, with EPO and PCT filings indicating a secondary tier of applicants pursuing broader international protection.
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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.
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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.