Critical Technology

Acoustic & Undersea Sensing

The capacity to sense with sound: sonar, acoustic arrays and the undersea sensing technologies on which undersea warfare, seabed awareness and ocean science all rest. One of the capabilities of Sensing, Timing & Navigation.

International families: 9,6962015 to 2024
Leading country: United States1.2× the next
All families: 30khome filings included
Over five years: Falling2020 to 2024 against the five before

Year by year

Patent families by country of origin and the year of the earliest filing, 2000 to 2025; 2025 is a part year, still filling in. International families are those for which protection was sought beyond one country.

Volume

International patent families in the capability, by the year of the earliest filing.

Source: Global Institute for National Capability (GINC), 2026. Underlying patents from 107 patent offices, IFI CLAIMS and Google

Share by country

Each country's share of the year's international families, in per cent: the capability's five largest countries of origin, 2015 to 2024, and the rest of the world.

Source: Global Institute for National Capability (GINC), 2026. Underlying patents from 107 patent offices, IFI CLAIMS and Google

Country leaderboard

International patent families, 2015 to 2024, by country of origin. Growth compares the latest five full years with the five before.

Ten largest

United States

Japan

Germany

China

South Korea

France

Netherlands

Norway

United Kingdom

Canada

2,064

1,735

1,370

1,097

687

463

392

305

217

211


1	United States	2,064	21.3%	0.7×	3,404
2	Japan	1,735	17.9%	0.7×	3,129
3	Germany	1,370	14.1%	1.0×	2,435
4	China	1,097	11.3%	1.3×	14,464
5	South Korea	687	7.1%	0.9×	2,410
6	France	463	4.8%	0.9×	574
7	Netherlands	392	4.0%	0.5×	418
8	Norway	305	3.1%	0.6×	453
9	United Kingdom	217	2.2%	0.7×	279
10	Canada	211	2.2%	1.1×	259
11	Taiwan	161	1.7%	0.7×	248
12	Sweden	117	1.2%	1.1×	128
13	Israel	103	1.1%	0.7×	127
14	Switzerland	91	0.9%	0.9×	116
15	Italy	89	0.9%	0.8×	127
16	Australia	79	0.8%	1.2×	90
17	Finland	69	0.7%	0.9×	74
18	Denmark	65	0.7%	0.5×	85
19	Austria	34	0.4%	0.5×	39
20	Belgium	34	0.4%	0.5×	45
21	Singapore	31	0.3%	1.6×	34
22	Saudi Arabia	29	0.3%	0.5×	40
23	India	28	0.3%	1.5×	47
24	Türkiye	27	0.3%	0.6×	53
25	Spain	24	0.2%	0.5×	30
26	Ireland	18	0.2%	3.5×	28
27	Russia	16	0.2%	0.5×	496
28	Cayman Islands	15	0.2%	0.7×	17
29	Poland	11	0.1%	1.2×	27
30	Portugal	9	0.1%	0.8×	10
31	Brazil	8	0.1%	1.0×	23
32	Hong Kong	4	0.0%	1.0×	9
33	New Zealand	4	0.0%	1.0×	7
34	Luxembourg	4	0.0%	0.0×	4
35	Mexico	4	0.0%	1.0×	13
36	Czechia	3	0.0%	0.0×	6
37	Hungary	2	0.0%	1.0×	5
38	South Africa	1	0.0%	–	1
39	Malaysia	0	0.0%	–	1

Applicants

The largest applicants by international patent families, 2015 to 2024: across the world, then within each of the five countries with the most families in Acoustic & Undersea Sensing. Names are as held in the source and are not consolidated across subsidiaries.

Global

9,696 international families

BOSCH GMBH ROBERT · Germany

KONINKLIJKE PHILIPS NV · Netherlands

VALEO SCHALTER & SENSOREN GMBH · Germany

DENSO CORP · Japan

SAMSUNG ELECTRONICS CO LTD · South Korea

PGS GEOPHYSICAL AS · Norway

373

267

207

167

146

113

United States

2,064 international families

FORD GLOBAL TECH LLC

QUALCOMM INC

GM GLOBAL TECH OPERATIONS LLC

BUTTERFLY NETWORK INC

BFLY OPERATIONS INC

SIEMENS MEDICAL SOLUTIONS USA INC

Japan

1,735 international families

DENSO CORP

FURUNO ELECTRIC CO

MITSUBISHI ELECTRIC CORP

TOYOTA MOTOR CORP

TOYOTA MOTOR CO LTD

PANASONIC IP MAN CO LTD

165

100

Germany

1,370 international families

BOSCH GMBH ROBERT

VALEO SCHALTER & SENSOREN GMBH

ROBERT BOSCH CO LTD

ATLAS ELEKTRONIK GMBH

THYSSENKRUPP AG

ELMOS SEMICONDUCTOR SE

371

206

China

1,097 international families

HUAWEI TECH CO LTD

BOE TECHNOLOGY GROUP CO LTD

SZ DJI TECHNOLOGY CO LTD

SHENZHEN MINDRAY BIOMEDICAL ELECTRONICS CO LTD

UNIV ZHEJIANG

BEIJING XIAOMI MOBILE SOFTWARE CO LTD

101

South Korea

China

United States

Japan

South Korea

Germany

2,007

1,837

1,145

638

314

Crosswalk

How Acoustic & Undersea Sensing is matched to the patent classifications. The entries below were chosen for it; each stands for itself and everything beneath it in the scheme, 155 Cooperative entries in all. A patent family counts when any of its codes, in either scheme and at any office, falls under one of them. Codes since retired are placed under the entries that replaced them.

Entry	Title in the scheme	Why it is chosen	CPC codes	IPC codes	Documents
G01S15/00	Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems	Sonar systems	61	28	127,201
G01S7/52	Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00	Sonar components and signal processing	43	20	85,735
G01S3/80	Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves	Acoustic direction finding	23	11	15,240
G01S5/18	Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic or infrasonic waves	Position fixing by sound	9	7	21,258
H04R1/44	Special adaptations for subaqueous use, e.g. for hydrophone	Hydrophones and underwater transducers	1	1	6,784
G01H3/00	Measuring characteristics of vibrations by using a detector in a fluid	Measuring vibration with detectors in a fluid	9	7	17,464
G01V1/38	Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas	Marine seismic and acoustic surveying	10	3	33,649
B63G8/39	Arrangements of sonic watch equipment, e.g. low-frequency, sonar	Sonar installations on submarines	1	1	1,638
G01S15/8906	Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques	Left out
G01S7/52017	Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging	Left out

CPC and IPC codes are the codes in use on patent documents, at any office, that fall under the entry. Documents is the larger of the two schemes' counts of documents carrying one of them. An entry with no IPC codes can be told apart only in the Cooperative scheme.

The Cooperative codes in use that count towards Acoustic & Undersea Sensing: 157 codes on 274,552 documents. The 150 most used are listed; the full list is in the cpc-to-capability.csv download.

Code	Title	Under entry	How placed	Documents
G01S15/931	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles	G01S15/00	In the scheme	19,176
G01S15/88	Sonar systems specially adapted for specific applications	G01S15/00	In the scheme	11,235
G01S7/521	Constructional features	G01S7/52	In the scheme	11,098
G01V1/38	Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas	G01V1/38	In the scheme	9,476
G01S15/89	Sonar systems specially adapted for specific applications for mapping or imaging	G01S15/00	In the scheme	8,669
G01V1/3808	Seismic data acquisition, e.g. survey design	G01V1/38	In the scheme	8,649
G01S15/08	Systems for measuring distance only	G01S15/00	In the scheme	7,860
G01S7/52004	Means for monitoring or calibrating	G01S7/52	In the scheme	7,706
G01S7/539	Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section	G01S7/52	In the scheme	7,247
G01S5/18	Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic or infrasonic waves	G01S5/18	In the scheme	7,212
G01S15/86	Combinations of sonar systems with lidar systems; Combinations of sonar systems with systems not using wave reflection	G01S15/00	In the scheme	6,476
G01S15/87	Combinations of sonar systems	G01S15/00	In the scheme	5,310
G01S15/04	Systems determining presence of a target	G01S15/00	In the scheme	4,995
G01H3/00	Measuring characteristics of vibrations by using a detector in a fluid	G01H3/00	In the scheme	4,554
G01S5/22	Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements	G01S5/18	In the scheme	4,533
G01S7/527	Extracting wanted echo signals	G01S7/52	In the scheme	4,396
G01S15/42	Simultaneous measurement of distance and other co-ordinates	G01S15/00	In the scheme	3,789
H04R1/44	Special adaptations for subaqueous use, e.g. for hydrophone	H04R1/44	In the scheme	3,739
G01S2015/938	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details in the bumper area	G01S15/00	In the scheme	3,694
G01S5/30	Determining absolute distances from a plurality of spaced points of known location	G01S5/18	In the scheme	3,516
G01S15/93	Sonar systems specially adapted for specific applications for anti-collision purposes	G01S15/00	In the scheme	3,415
G01S15/96	Sonar systems specially adapted for specific applications for locating fish	G01S15/00	In the scheme	3,233
G01S3/8083	Systems for determining direction or deviation from predetermined direction using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems determining direction of source	G01S3/80	In the scheme	3,187
G01S15/06	Systems determining the position data of a target	G01S15/00	In the scheme	3,117
G01V1/3817	Positioning of seismic devices	G01V1/38	In the scheme	3,093
G01S7/524	Transmitters	G01S7/52	In the scheme	3,007
G01S15/10	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves	G01S15/00	In the scheme	2,738
G01V1/3826	Positioning of seismic devices dynamic steering, e.g. by paravanes or birds	G01V1/38	In the scheme	2,730
G01S2015/932	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations	G01S15/00	In the scheme	2,587
G01S5/20	Position of source determined by a plurality of spaced direction-finders	G01S5/18	In the scheme	2,466
G01V1/3843	Deployment of seismic devices, e.g. of streamers	G01V1/38	In the scheme	2,459
G01V1/3852	Deployment of seismic devices, e.g. of streamers to the seabed	G01V1/38	In the scheme	2,405
G01S15/876	Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector	G01S15/00	In the scheme	2,395
G01V1/3835	Positioning of seismic devices measuring position, e.g. by GPS or acoustically	G01V1/38	In the scheme	2,348
G01S15/02	Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves	G01S15/00	In the scheme	2,328
G01S7/526	Receivers	G01S7/52	In the scheme	2,179
G01S15/66	Sonar tracking systems	G01S15/00	In the scheme	2,131
G01S7/52	Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00	G01S7/52	In the scheme	2,124
G01S15/58	Velocity or trajectory determination systems; Sense-of-movement determination systems	G01S15/00	In the scheme	2,008
G01V1/3861	Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas control of source arrays, e.g. for far field control	G01V1/38	In the scheme	2,005
G01S3/80	Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves	G01S3/80	In the scheme	1,953
G01S3/808	Systems for determining direction or deviation from predetermined direction using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems	G01S3/80	In the scheme	1,895
G01S15/60	Velocity or trajectory determination systems; Sense-of-movement determination systems wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track	G01S15/00	In the scheme	1,719
G01S3/802	Systems for determining direction or deviation from predetermined direction	G01S3/80	In the scheme	1,707
G01S7/52003	Techniques for enhancing spatial resolution of targets	G01S7/52	In the scheme	1,645
B63G8/39	Arrangements of sonic watch equipment, e.g. low-frequency, sonar	B63G8/39	In the scheme	1,638
G01S2015/937	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details	G01S15/00	In the scheme	1,605
G01S15/104	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves using transmission of pulses having some particular characteristics wherein the transmitted pulses use a frequency- or phase-modulated carrier wave	G01S15/00	In the scheme	1,557
G01H3/125	Amplitude; Power by electric means for representing acoustic field distribution	G01H3/00	In the scheme	1,553
G01S15/74	Systems using reradiation of acoustic waves, e.g. IFF, i.e. identification of friend or foe	G01S15/00	In the scheme	1,503
G01S15/8902	Side-looking sonar	G01S15/00	In the scheme	1,490
G01S3/801	Details	G01S3/80	In the scheme	1,455
G01S15/582	Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse-modulated waves and based upon the Doppler effect resulting from movement of targets	G01S15/00	In the scheme	1,454
G01H3/12	Amplitude; Power by electric means	G01H3/00	In the scheme	1,451
G01S7/52006	Means for monitoring or calibrating with provision for compensating the effects of temperature	G01S7/52	In the scheme	1,444
G01H3/08	Analysing frequencies present in complex vibrations, e.g. comparing harmonics present	G01H3/00	In the scheme	1,389
G01S15/101	Particularities of the measurement of distance	G01S15/00	In the scheme	1,376
G01S15/003	Bistatic sonar systems; Multistatic sonar systems	G01S15/00	In the scheme	1,316
G01S5/26	Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements	G01S5/18	In the scheme	1,256
G01S7/5273	Extracting wanted echo signals using digital techniques	G01S7/52	In the scheme	1,234
G01S15/46	Indirect determination of position data	G01S15/00	In the scheme	1,199
G01H3/005	Testing or calibrating of detectors covered by the subgroups of G01H3/00	G01H3/00	In the scheme	1,153
G01S7/53	Means for transforming coordinates or for evaluating data, e.g. using computers	G01S7/52	In the scheme	1,128
G01S3/8006	Multi-channel systems specially adapted for direction-finding, i.e. having a single aerial system capable of giving simultaneous indications of the directions of different signals	G01S3/80	In the scheme	1,125
G01S7/523	Details of pulse systems	G01S7/52	In the scheme	1,122
G01S15/102	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves using transmission of pulses having some particular characteristics	G01S15/00	In the scheme	1,116
G01S15/50	Systems of measurement, based on relative movement of the target	G01S15/00	In the scheme	1,095
G01S7/534	Details of non-pulse systems	G01S7/52	In the scheme	1,093
G01H3/10	Amplitude; Power	G01H3/00	In the scheme	1,091
G01H3/04	Frequency	G01H3/00	In the scheme	1,018
G01S5/28	Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic or infrasonic waves by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial	G01S5/18	In the scheme	1,013
G01S15/523	Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection	G01S15/00	In the scheme	1,012
G01S2015/935	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations for measuring the dimensions of the parking space when driving past for measuring the contour, e.g. a trajectory of measurement points, representing the boundary of the parking space	G01S15/00	In the scheme	995
G01S7/56	Display arrangements	G01S7/52	In the scheme	989
G01H3/14	Measuring mean amplitude; Measuring mean power; Measuring time integral of power	G01H3/00	In the scheme	969
G01S15/878	Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector wherein transceivers are operated, either sequentially or simultaneously, both in bi-static and in mono-static mode, e.g. cross-echo mode	G01S15/00	In the scheme	945
G01S7/52001	Auxiliary means for detecting or identifying sonar signals or the like, e.g. sonar jamming signals	G01S7/52	In the scheme	916
G01S7/536	Extracting wanted echo signals	G01S7/52	In the scheme	912
G01S15/00	Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems	G01S15/00	In the scheme	876
G01S15/52	Discriminating between fixed and moving objects or between objects moving at different speeds	G01S15/00	In the scheme	870
G01S15/8904	Side-looking sonar using synthetic aperture techniques	G01S15/00	In the scheme	868
G01S7/537	Counter-measures or counter-counter-measures, e.g. jamming, anti-jamming	G01S7/52	In the scheme	823
G01S2015/465	Indirect determination of position data by Trilateration, i.e. two transducers determine separately the distance to a target, whereby with the knowledge of the baseline length, i.e. the distance between the transducers, the position data of the target is determined	G01S15/00	In the scheme	807
G01S7/529	Gain of receiver varied automatically during pulse-recurrence period	G01S7/52	In the scheme	802
G01S5/186	Determination of attitude	G01S5/18	In the scheme	759
G01S15/586	Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets	G01S15/00	In the scheme	753
G01H3/06	Frequency by electric means	G01H3/00	In the scheme	749
G01S3/86	Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves with means for eliminating undesired waves, e.g. disturbing noises	G01S3/80	In the scheme	733
G01S15/32	Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated	G01S15/00	In the scheme	712
G01S2007/52009	Means for monitoring or calibrating of sensor obstruction, e.g. dirt- or ice-coating	G01S7/52	In the scheme	707
G01S7/6245	Stereoscopic displays; Three-dimensional displays; Pseudo-three dimensional displays	G01S7/52	In the scheme	681
G01S15/885	Meteorological systems	G01S15/00	In the scheme	665
G01S7/54	Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 with receivers spaced apart	G01S7/52	In the scheme	630
G01S15/588	Velocity or trajectory determination systems; Sense-of-movement determination systems measuring the velocity vector	G01S15/00	In the scheme	610
G01S7/6281	Composite displays, e.g. split-screen, multiple images	G01S7/52	In the scheme	593
G01S15/34	Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal	G01S15/00	In the scheme	578
G01S7/6272	Cathode-ray tube displays producing cursor lines and indicia by electronic means	G01S7/52	In the scheme	563
G01S15/18	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves wherein range gates are used	G01S15/00	In the scheme	539
G01S7/60	Display arrangements for providing a permanent recording	G01S7/52	In the scheme	539
G01S15/14	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves wherein a voltage or current pulse is initiated and terminated in accordance respectively with the pulse transmission and echo reception	G01S15/00	In the scheme	524
G01S15/872	Combination of several systems for attitude determination	G01S15/00	In the scheme	505
G01S15/107	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves using transmission of pulses having some particular characteristics using frequency agility of carrier wave	G01S15/00	In the scheme	502
G01S15/325	Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of coded signals, e.g. of phase-shift keyed [PSK] signals	G01S15/00	In the scheme	482
G01S7/6218	Cathode-ray tube displays providing two-dimensional coordinated display of distance and direction	G01S7/52	In the scheme	466
G01S7/6263	Cathode-ray tube displays in which different colours are used	G01S7/52	In the scheme	464
G01S2015/936	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations for measuring the dimensions of the parking space when driving past for measuring parking spaces extending transverse or diagonal to the driving direction, i.e. not parallel to the driving direction	G01S15/00	In the scheme	438
G01S15/36	Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal	G01S15/00	In the scheme	433
G01S3/803	Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics	G01S3/80	In the scheme	419
G01S7/62	Cathode-ray tube displays	G01S7/52	In the scheme	389
G01S3/805	Systems for determining direction or deviation from predetermined direction using adjustment of real or effective orientation of directivity characteristics of a transducer or transducer system to give a desired condition of signal derived from that transducer or transducer system, e.g. to give a maximum or minimum signal	G01S3/80	In the scheme	386
G01S15/62	Sense-of-movement determination	G01S15/00	In the scheme	380
G01S3/8086	Systems for determining direction or deviation from predetermined direction using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems determining other position line of source	G01S3/80	In the scheme	370
G01S2015/933	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations for measuring the dimensions of the parking space when driving past	G01S15/00	In the scheme	361
G01S7/5276	Extracting wanted echo signals using analogue techniques	G01S7/52	In the scheme	343
G01S2015/939	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details vertical stacking of sensors, e.g. to enable obstacle height determination	G01S15/00	In the scheme	334
G01S2015/934	Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations for measuring the dimensions of the parking space when driving past for measuring the depth, i.e. width, not length, of the parking space	G01S15/00	In the scheme	326
G01S15/006	Theoretical aspects	G01S15/00	In the scheme	304
G01V1/387	Reducing secondary bubble pulse, i.e. reducing the detected signals resulting from the generation and release of gas bubbles after the primary explosion	G01V1/38	In the scheme	296
G01S3/8034	Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics wherein the signals are derived simultaneously	G01S3/80	In the scheme	290
G01S15/874	Combination of several spaced transponders or reflectors of known location for determining the position of a receiver	G01S15/00	In the scheme	286
G01S15/108	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves using transmission of pulses having some particular characteristics using more than one pulse per sonar period	G01S15/00	In the scheme	285
G01S7/533	Data rate converters	G01S7/52	In the scheme	282
G01S15/584	Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse-modulated waves and based upon the Doppler effect resulting from movement of targets with measures taken for suppressing velocity ambiguities, i.e. anti-aliasing	G01S15/00	In the scheme	279
G01S15/526	Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection by comparing echos in different sonar periods	G01S15/00	In the scheme	278
G01S2007/52011	Means for monitoring or calibrating of sensor obstruction, e.g. dirt- or ice-coating including means to prevent or remove the obstruction	G01S7/52	In the scheme	276
G01S5/24	Position of single direction-finder fixed by determining direction of a plurality of spaced sources of known location	G01S5/18	In the scheme	276
G01S7/531	Scan converters	G01S7/52	In the scheme	276
G01S2007/52007	Means for monitoring or calibrating involving adjustment of transmitted power	G01S7/52	In the scheme	265
G01S2007/52014	Means for monitoring or calibrating involving a reference reflector integrated in the sensor or transducer configuration	G01S7/52	In the scheme	259
G01S3/8022	Systems for determining direction or deviation from predetermined direction using the Doppler shift introduced by the relative motion between source and receiver	G01S3/80	In the scheme	250
G01S3/8027	By vectorial composition of signals received by plural, differently-oriented transducers	G01S3/80	In the scheme	248
G01S2007/52012	Means for monitoring or calibrating involving a reference ground return	G01S7/52	In the scheme	247
G01S15/025	Retired code	G01S15/00	Retired, by main group	232
G01S3/8036	Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics wherein the signals are derived simultaneously derived directly from separate directional systems	G01S3/80	In the scheme	231
G01S15/12	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves wherein the pulse-recurrence frequency is varied to provide a desired time relationship between the transmission of a pulse and the receipt of the echo of a preceding pulse	G01S15/00	In the scheme	228
G01S5/183	Emergency, distress or locator beacons	G01S5/18	In the scheme	227
G01S7/64	Luminous indications	G01S7/52	In the scheme	221
G01S3/82	Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves with means for adjusting phase or compensating for time-lag errors	G01S3/80	In the scheme	211
G01S15/105	Systems for measuring distance only using transmission of interrupted, pulse-modulated waves using transmission of pulses having some particular characteristics using irregular pulse repetition frequency	G01S15/00	In the scheme	207
G01S3/8003	Diversity systems specially adapted for direction finding	G01S3/80	In the scheme	190
G01V1/393	Means for loading explosive underwater charges, e.g. combined with ignition devices	G01V1/38	In the scheme	188
G01S3/809	Rotating or oscillating beam systems using continuous analysis of received signal for determining direction in the plane of rotation or oscillation or for determining deviation from a predetermined direction in such a plane	G01S3/80	In the scheme	177
G01S7/629	Cathode-ray tube displays the display being oriented or displaced in accordance with the movement of object carrying the transmitting and receiving apparatus	G01S7/52	In the scheme	170
G01S7/58	Display arrangements for providing variable ranges	G01S7/52	In the scheme	141
G01S7/52015	Diversity systems	G01S7/52	In the scheme	133
G01S7/6209	Cathode-ray tube displays providing display of one measured variable	G01S7/52	In the scheme	119
G01S3/8055	Systems for determining direction or deviation from predetermined direction using adjustment of real or effective orientation of directivity characteristics of a transducer or transducer system to give a desired condition of signal derived from that transducer or transducer system, e.g. to give a maximum or minimum signal adjusting orientation of a single directivity characteristic to produce maximum or minimum signal	G01S3/80	In the scheme	103
G01S7/5345	Gain control of receivers	G01S7/52	In the scheme	96
G01S7/6236	Sector-scan displays	G01S7/52	In the scheme	88
G01S7/6227	Plan-position indicators, i.e. P.P.I.	G01S7/52	In the scheme	86

Match: Direct

The capability is itself a technology or a kind of physical system, and the classification names it. Medical ultrasound imaging is carved out, but only in CPC; IPC counts for G01S15/89 and G01S7/52 still include it. The crosswalk is a first pass that nobody has reviewed.

Acoustic & Undersea Sensing

Year by year

Volume

Share by country

Country leaderboard

Ten largest

Applicants

Global

United States

Japan

Germany

China

South Korea

Similar capabilities

Crosswalk

Other capabilities in Sensing, Timing & Navigation