Spacecraft ADCS Patents: Who Leads, Where the Gaps Are 2026
- Filing activity has already peaked. 2020 was the high-water mark at 23 filings; by the 2022 midpoint annual filings had fallen back to 4, and the trend has stayed flat or declined since.
- Claim density concentrates in two IPC subclasses. B64G (cosmonautics/spacecraft) and G05D (control of non-electric variables) cover the large majority of the 224 families, while G01S, G05B and F03H each carry only single-digit or low double-digit counts.
- The most-cited prior art is decades old. The five most-cited records date back as far as 1974, meaning current filers are building on attitude-control fundamentals rather than displacing recently established claims.
What this landscape covers
Spacecraft attitude determination and control (ADCS) patents span the hardware that senses and corrects orientation — star trackers, reaction wheels, control moment gyros and magnetorquers — and the control-loop logic that turns sensor data into torque commands. This landscape pulls 224 patent families published between 2015 and the 2026 data cut-off, filtered to records that combine attitude-control system language with specific hardware or performance terms such as pointing accuracy and momentum dumping, and classified under the IPC codes covering spacecraft (B64G), non-electric control (G05D) and navigation/gyroscopes (G01C).
Because publication typically lags filing by around 18 months, the most recent year in any trend chart understates real activity; treat the last one to two years as a floor, not a ceiling. Family counts, not raw document counts, are used throughout so that multi-jurisdiction and continuation filing does not inflate any single assignee's apparent footprint.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trend and technology composition
Two views of the same 224-family dataset: how filing volume has moved year over year, and how that volume splits across the IPC subclasses that define the field's hardware and control-logic boundaries.
A field that has cooled since 2020
Filings rose from 4 in 2017 to a peak of 23 in 2020, then fell back toward 4 by 2022 and have stayed flat or declining through to the partial 2026 count. That shape is consistent with a technology area where core hardware claims were staked out early in the window and subsequent filing has been incremental rather than expansionary.
B64G and G05D dominate the classification mix
B64G (cosmonautics and spacecraft) appears in 206 of 224 records and G05D (control of non-electric variables) in 101, confirming this is fundamentally a spacecraft-hardware field with a large control-software overlay. G01C (navigation and gyroscopes, 30) and G01S (radar/sonar positioning, 21) show meaningful but secondary sensor-fusion activity, while G05B, B64C, G06F and F03H each sit in single digits to low double digits — signals of adjacent activity rather than core claim territory.
Shares are the percentage of the 224 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Spacecraft Attitude Determination and Control with Eureka
This page is one run against one query. Ask Eureka your own question about spacecraft attitude determination and control and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art current filers build on
Gyroscopic attitude control system (US11221633B2, Raytheon Company, 2022)
The patent describes an attitude control system built on one or more control moment gyro pairs, where the gyros within a pair are counter-rotated so that the rotation axes of their flywheels move in opposite directions. Flywheels can sit in a paddle configuration, sweeping through separate planes during counter-rotation, and can be driven either by a shared servo motor through coupling gears or by independent servos per gyro. The counter-rotation of a gyro pair produces a resultant torque about a fixed global axis.Filed by Raytheon, granted January 2022 — illustrative of how mechanical CMG pairing claims are currently being structured.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5899945A | Attitude control and navigation system for high resolution imaging | 135 |
| 2 | US3866025A | Spacecraft attitude control system | 130 |
| 3 | US4732353A | Three axis attitude control system | 123 |
| 4 | US6341249B1 | Autonomous unified on-board orbit and attitude control system for satellites | 120 |
| 5 | US3741500A | A CMG fine attitude control system | 93 |
| 6 | US20120199697A1 | Attitude control system for small satellites | 84 |
| 7 | US6285927B1 | Spacecraft attitude determination system and method | 72 |
| 8 | US5312073A | Method for controlling the pitch attitude of a satellite by means of solar radiation pressure and satellite, … | 66 |
| 9 | CN103092208A | 基于SGCMG和RW的航天器高精度快速姿态机动方法 | 55 |
| 10 | US6295021B1 | Techniques for monitoring and controlling yaw attitude of a GPS satellite | 54 |
Citation counts favour older records simply because they have had longer to accumulate citations within this searched corpus; read them as a measure of foundational influence, not of what is currently competitively active.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the filing pattern signals
Reading the trend, the IPC split and the citation graph together points to a field with mature, well-defended hardware fundamentals and a thinner, more fragmented layer of recent control-software activity.
Peak activity is already behind this field
The run-up from 4 filings in 2017 to 23 in 2020 looks like a land-grab around core ADCS hardware claims; the fall back to 4 by 2022 and continued flat-to-declining trend suggests that grab is largely complete rather than still in progress.
Spacecraft-specific claims dominate over generic control theory
Nine in ten records carry the B64G spacecraft classification, meaning most claims are anchored to spacecraft-specific implementations rather than general control-systems language that could read on aircraft or ground robotics.
Foundational art predates the filing window entirely
The most-cited records in the corpus were granted well before 2015, which means recent filers are largely building incremental improvements on long-settled mechanical and control-loop fundamentals rather than contesting recently staked claims.
Collaboration is rare and concentrated in one research partnership
Only five co-assignee pairs appear across the corpus, and the strongest of them all involve the same university research foundation working with named individual inventors — evidence of academic-industry collaboration rather than broad cross-company joint filing.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to spacecraft attitude determination and control, with the prior art for and against each one.
Who is filing, and where activity has gone quiet
Recent-year momentum across the tracked assignees is uniformly flat: every major filer in this dataset shows zero filings in the latest tracked year, which is consistent with a field past its filing peak rather than one where a single competitor has pulled ahead recently.
No assignee is currently accelerating
Across the tracked leaders — spanning aerospace primes, a national space research institute and a university research foundation — recent-year filing counts have all dropped to zero, indicating the intense 2018-2020 filing period has not been followed by a comparable second wave from any single player.
A long tail sits behind a small set of repeat filers
With 224 families total and only a handful of co-assignee relationships, the field reads as dominated by a small number of established aerospace and defense filers plus a long tail of single- or low-count entrants, typical of hardware-anchored space systems IP.
University research feeds directly into named inventor filings
The strongest co-assignee relationship in the dataset pairs a university research foundation with individual named inventors across multiple filings, suggesting a lab-to-patent pipeline worth tracking for early licensing or sponsored-research opportunities.
| Assignee | Recent year | YoY |
|---|---|---|
| Korea Aerospace Research Institute (KARI) | 0 | — |
| General Atomics | 0 | — |
| Honeywell International Inc. | 0 | — |
| Space Systems/Loral, LLC | 0 | — |
| Raytheon Company | 0 | — |
| University of Florida Research Foundation, Inc. | 0 | — |
| Urugus S.A. | 0 | — |
| The Boeing Company | 0 | — |
Where to take this analysis
The trend and classification data point to specific next steps depending on whether you are clearing a filing, scouting licensing targets, or tracking a competitor.
Run a freedom-to-operate check on CMG pairing claims
Given how central control moment gyro claims are to the highest-cited records and to recent filings like US11221633B2, any new CMG mechanical design should be checked against the counter-rotation and coupling-gear claim language already established in this corpus.
Search CMG prior art in EurekaWatch the university-research pipeline
The strongest co-assignee cluster in this dataset links a university research foundation to individual named inventors; tracking that lab's ongoing output may surface licensable early-stage attitude-control IP before it reaches a corporate assignee.
Track this assignee cluster in EurekaScope claims around under-claimed sensor fusion
G01S and G06F appear only as secondary classifications across this corpus, suggesting sensor-fusion and onboard-software claims tied to attitude determination remain comparatively open relative to core hardware.
Explore white space in EurekaCommon questions about ADCS patents
This dataset tracks assignee filing counts across 224 patent families, and the ranking shows concentration among a small set of established aerospace and defense filers alongside a long tail of single- or low-count entrants. Rather than one dominant leader pulling away, recent-year momentum data shows every major tracked assignee at zero filings in the latest year, meaning the current ranking reflects historical filing built up mostly between 2017 and 2020 rather than an active race. Anyone assessing competitive position should look at cumulative family counts together with recent-year momentum, since a large historical count with no recent activity signals a different posture than steady ongoing filing.
Filing activity peaked at 23 in 2020 and had fallen back to 4 by the 2022 midpoint, with the trend flat or declining since — evidence that the most intensive filing period for this specific claim space has passed. That does not mean the technology itself is inactive; it means the core hardware and control-loop claims captured by this search were largely staked out during the 2017-2020 window. Because publication lags filing by roughly 18 months, the final one to two years of any trend chart will always look thinner than they eventually turn out to be, so recent quiet should be read cautiously rather than as definitive market exit.
B64G, the cosmonautics and spacecraft classification, appears in 206 of the 224 records in this dataset, making it the dominant classification for this field. G05D, covering control of non-electric variables, appears in 101 records and captures the control-loop and torque-command logic layered on top of the physical hardware. G01C, covering navigation and gyroscopes, and G01S, covering radar and positioning, are secondary but meaningful, reflecting sensor-fusion work tied to star trackers and pointing-accuracy claims.
The classification split shows G05B, B64C, G06F and F03H each carrying only single-digit to low double-digit record counts compared to several hundred for the core B64G and G05D classes, which points to thinner claim density in areas like onboard software fault detection, plasma/ion-thruster attitude coupling, and hybrid switching logic between reaction wheels and control moment gyros. Thin claim density is not the same as no legal risk, since a small number of broad claims can still block a narrow area effectively. A freedom-to-operate search focused specifically on those secondary classifications is the practical way to confirm whether a given sub-area is genuinely open.
US11221633B2, granted to Raytheon in January 2022, claims an attitude control system using counter-rotated control moment gyro pairs in a paddle flywheel configuration, driven either by a shared servo through coupling gears or by independent servos per gyro. Anyone designing a new CMG-based system needs to check whether their mechanical coupling and counter-rotation approach falls within these claims, particularly if it uses a similar paddle configuration or shared-servo drive train. Because this patent sits among recent, actively enforceable filings rather than decades-old foundational art, it carries more practical freedom-to-operate weight than the older, more-cited records in this corpus.
Research Spacecraft Attitude Determination and Control in depth with Eureka
Go past this page: query the whole spacecraft attitude determination and control corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.