G01S 13/781
Secondary surveillance radar [ssr] in general
Official title: {Secondary Surveillance Radar [SSR] in general}
G01S13/781 (Secondary surveillance radar [ssr] in general) appears on 306 US grants and 213 published applications in this corpus.
Search patents in G01S- Granted patents
- 306
- Published applications
- 213
- Assignees
- 135
- Inventors
- 457
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 8 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 6 | 0 |
| 1989 | 1 | 0 |
| 1990 | 8 | 0 |
| 1991 | 8 | 0 |
| 1992 | 4 | 0 |
| 1993 | 10 | 0 |
| 1994 | 7 | 0 |
| 1995 | 9 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 5 | 6 |
| 2003 | 10 | 10 |
| 2004 | 11 | 8 |
| 2005 | 3 | 7 |
| 2006 | 10 | 9 |
| 2007 | 4 | 7 |
| 2008 | 7 | 14 |
| 2009 | 9 | 11 |
| 2010 | 13 | 12 |
| 2011 | 7 | 13 |
| 2012 | 11 | 16 |
| 2013 | 7 | 6 |
| 2014 | 8 | 8 |
| 2015 | 9 | 4 |
| 2016 | 7 | 6 |
| 2017 | 6 | 6 |
| 2018 | 4 | 11 |
| 2019 | 4 | 11 |
| 2020 | 13 | 10 |
| 2021 | 18 | 12 |
| 2022 | 10 | 13 |
| 2023 | 10 | 5 |
| 2024 | 5 | 1 |
| 2025 | 6 | 4 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Methodology to provide assurance of data association in navigation and radar systems19 May 2026US 12,632,048 B2Honeywell International Inc.
- Airfield multilateration system with private 5G cellular network31 Mar 2026US 12,591,034 B2ADB Safegate BV
- Aerial vehicle detection system7 Oct 2025US 12,437,652 B2Flirtey Holdings, Inc.
- Enhanced LDACS that uses doppler shifts in carrier signals for positioning and navigation26 Aug 2025US 12,399,274 B2Skystream LLC
- Ranging method and apparatus24 Jun 2025US 12,339,351 B2Huawei Technologies Co., Ltd.
- Smart surveillance data processing systems for safe uncrewed aircraft and surface vessel operation beyond visual line of sight10 Sep 2026US 2026/0266988 A1Accipiter Radar Technologies Inc.
- Method and apparatus for determining a pulse repetition frequency pattern from a stream of pulses27 Aug 2026US 2026/0251777 A1Seamatica Aerospace Ltd.
- Smart surveillance data processing systems for safe uncrewed aircraft and surface vessel operation beyond visual line of sight16 Jul 2026US 2026/0202540 A1Accipiter Radar Technologies Inc.
- A system for compressing reflected signals on a fluctuating noise background in active surveillance radar systems26 Jun 2025US 2025/0208254 A1Viettel Group
- Detecting hardware failure in a radar system based on comparing actual and expected radar data26 Jun 2025US 2025/0208257 A1Honeywell International Inc.
Most cited
By later US patents
- Passive secondary surveillance radar using signals of remote SSR and multiple antennas switched in synchronism with rotation of SSR beam227US 5,198,823 ALitchstreet Co. · 1993
- Automatic dependent surveillance air navigation system127US 5,570,095 AMassachusetts Institute of Technology · 1996
- Airborne surveillance method and system120US 5,075,694 AAvion Systems, Inc. · 1991
- Airborne surveillance method and system88US 4,910,526 AAvion Systems, Inc. · 1990
- Miniaturized data communication and identification system75US 5,182,543 ABoard of Trustees operating Michigan State University · 1993