GB2509060A - Means and Method to Minimize RF Interference in Scanning Radar - Google Patents
Means and Method to Minimize RF Interference in Scanning Radar Download PDFInfo
- Publication number
- GB2509060A GB2509060A GB1222830.0A GB201222830A GB2509060A GB 2509060 A GB2509060 A GB 2509060A GB 201222830 A GB201222830 A GB 201222830A GB 2509060 A GB2509060 A GB 2509060A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- frequency
- filter
- receiver
- azimuth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 16
- 230000000903 blocking effect Effects 0.000 claims description 7
- 230000003595 spectral effect Effects 0.000 description 4
- 230000001627 detrimental effect Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
- G01S13/426—Scanning radar, e.g. 3D radar
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
- G01S7/0236—Avoidance by space multiplex
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
An antenna system (1) comprises a directional antenna (2) adapted to rotate through a range of directions in azimuth. It is responsive to radio-frequency (RF) signals received from directions within the range of directions in azimuth. A receiver (7) is arranged to receive the RF signals from the antenna within a signal frequency response band of the receiver and to provide a corresponding output for signal processing. A signal filter (11) is operable to block the output from the receiver when the frequency of the RF signal lies at a frequency within the signal frequency response band of the receiver and a detector unit (8) is arranged to apply the signal filter when the directional antenna is directed to a predetermined azimuth at which an interference source is located and to not apply the signal filter otherwise.
Description
IMPROVEMENTS IN AND RELATING TO RADAR
FIELD OF THE INVENTION
The present invention relates to radar systems employing a directional antenna forming a beam that is e.g. swept through a range of azimuth angles in use.
BACKGROUND
The frequency band for some telecommunications signal frequencies (e.g. "4G") may abut or reside closely with a radar signal frequency (e.g. the "5-Band" -from 2GHz to 4GHz). A narrow buffer zone typically exists in the frequency spectrum separating telecommunications signal frequency band from the radar signal frequency band. This aims to avoid interference of telecommunications signals with radar operations. The distribution of such neighbouring bands is shown schematically in Figure 1.
However, circumstances can arise in which telecommunications signals may appear within, or may migrate to, frequencies falling within the radar band adjacent to it. A spill-over can occur from the spectral content of the telecommunications signal frequency band into the radar band. Radar receivers may pick up interference from the low-level spectral content of a telecoms signal that can extend for up to one quarter of the way into a radar band. These interfere with radar operations and are detrimental to safety, especially with respect to airport radar systems etc. The invention aims to address this.
SUMMARY OF THE INVENTION
In order to mitigate against any telecommunications (e.g. 4G) signals migrating into the operational radar signal frequency band (e.g. S-band), the invention at its most general is to apply selectively an azimuth dependent filter to a region of the signal frequency band (e.g. S-band) of the radar antenna adjacent to the telecommunications signal frequency band (e.g. a 4G band) to effectively widen the buffer zone. The invention may include assessing the impact of any interference and determining the action to be taken, which may vary from taking no action, if the impact of interference is acceptable, to taking some action by applying the filter.
For example, the invention may include determining a magnitude a received signal and determining from that magnitude whether the signal will overload the receivers of the radar system.
Upon detection of a telecommunications transmitter at a particular azimuth, a frequency filter may be applied (e.g. periodically) to signals received by the radar receiver whilst at that azimuth, so as to remove signals within the widened buffer zone. Signals at other frequencies within the radar signal frequency band may continue to be received.
In a first aspect, the invention may provide an antenna system comprising: a directional antenna adapted to rotate through a range of directions in azimuth and responsive to radio-frequency (RF) signals received from directions within the range of directions in azimuth; a receiver arranged to receive the RF signals from the antenna within a signal frequency response band of the receiver and to provide a corresponding output for signal processing; a signal filter arranged to block an output from the receiver when the frequency of the RF signal lies at a frequency within the signal frequency response band; a controller arranged to apply the signal filter when the directional antenna is directed to a predetermined azimuth and to not apply the signal filter otherwise.
In this way interfering signals may be blocked at relevant azimuth positions by applying the signal filter when the directional antenna is directed to a predetermined azimuth at which an interference source is located and to not apply the signal filter otherwise.
The antenna system may include a further receiver arranged to receive further RF signals having a frequency outside of, and adjacent to, the signal frequency response band and to provide a corresponding further output for signal processing, wherein the controller is arranged to apply the filter according to the further output. Preferably, the filter is applied if such further RE signals are received, and not applied otherwise.
The controller may be arranged to determine a measure of a degree of signal interference in signals within the signal frequency response band and to apply the filter if the further RF signals are received and the measure exceeds a predetermined threshold. The controller may determine the measure of the degree of signal interference by determining the power of a received signal(s).
The predetermined threshold may be a predetermined signal power level threshold value. Preferably, the threshold value is a signal power level value above which, if received by the receiver of the antenna system, will/would overload the receiver (e.g. cause it to operate/respond non-linearly). In this way, the filter may be selectively applied based on this threshold comparison. The further receiver may be arranged to receive the further RF signals from the antenna or from a dedicated further antenna.
The spectrum or characteristic of the filter is preferably arranged to block frequencies residing in only some but not all of the signal frequency response band of the receiver. For example, the spectrum or characteristic of the filter may extend part way in to the signal frequency response band (e.g. covering up to 1/8th of the response bandwidth) from/across one end (upper or lower end) of the response band.
The signal filter is preferably a high-pass (or low-pass) filter arranged to block the output from the receiver when the frequency of the RF signal lies below (or above) a threshold frequency defined by the signal filter.
The directional antenna may be arranged to rotate periodically through 360 degrees and the controller is preferably arranged to apply the signal filter periodically. The controller may be arranged to apply the signal filter with a period icity corresponding to the rotation period of the directional antenna.
The predetermined azimuth is preferably a predetermined range of azimuth angles. For example, the range may be a range corresponding to the angular width of the beam of the antenna, or corresponding to the angular width of any relevant lobe of the radiation pattern of the antenna (e.g. main lobe or a significant side lobe).
In a second aspect, the invention may provide a method for controlling a directional antenna system comprising: rotating a directional antenna through a range of directions in azimuth; receiving RF signals from the antenna at a receiver responsive to radio-frequency (RF) signals within a signal frequency response band therewith to provide a corresponding output for signal processing; selectively blocking an output from the receiver using a signal filter if the frequency of the RF signal lies at a frequency within the signal frequency response band whereby the signal filter is applied if the directional antenna is directed to a predetermined azimuth and is not applied otherwise. The receiving of the RF signals is preferably in respect of signals received from directions within the range of directions in azimuth.
The method may include receiving further RF signals at a further receiver having a frequency outside of, and adjacent to, the signal frequency response band and therewith providing a corresponding further output for signal processing. The method may include applying the filter according to the further output. Preferably, the filter is applied if such further RF signals are received, and not applied otherwise.
The method may include determining a measure of a degree of signal interference in signals within the signal frequency response band and to applying the filter if the further RE signals are received and the measure exceeds a predetermined threshold. The method may include determining the measure of the degree of signal interference by determining the power of a received signal(s). The predetermined threshold may be a predetermined signal power level threshold value. Preferably, the threshold value is a signal power level value above which, if received by the receiver of the antenna system, will/would overload the receiver (e.g. cause it to operate/respond non-linearly).
The further receiver may be arranged to receive the further RF signals from the antenna or from a dedicated further antenna.
The method may include blocking, using the signal filter, frequencies residing in only some but not all of the signal frequency response band of the receiver. For example, the method may include blocking signal frequencies extending part way in to the signal frequency response band (e.g. covering up to 118th of the response bandwidth) from/across one end (upper or lower end) of the response band.
The method may include rotating the directional antenna periodically through 360 degrees applying the signal filter periodically. The method may include applying the signal filter with a periodicity corresponding to the rotation period of the directional antenna. The predetermined azimuth is preferably a predetermined range of azimuth angles.
The signal filter is preferably a high-pass (or low pass) filter, and the method may include blocking the output from the receiver using the signal filter when the frequency of the RE signal lies below (or above) a threshold frequency defined by the signal filter.
BRIEE DESCRIPTION OF THE DRAWINGS
An exemplary, but non-limiting embodiment of the invention shall now be described with reference to the drawings of which: Figure 1 shows schematically a buffer region separating telecommunications and radar signal frequency bands; Figure 2 graphically shows the spectral characteristic of a filter according to an embodiment of the invention; Figure 3 graphically shows the azimuthal dependence of the filter state in use according to an embodiment of the invention; Figure 4 schematically shows a radar apparatus according to an embodiment of the invention.
In the drawings, like items are assigned like reference symbols.
DETAILED DESCRIPTION
Figure 4 shows a schematic representation of a radar apparatus (1) comprising a directional antenna (2) arranged to be rotated in azimuth at a desired uniform rate (as shown by arrows). The antenna is arranged to form an antenna main beam (3) having an angular spread of AU degrees in azimuth. A telecommunications tower (4) radiates telecommunications signals having frequencies in a telecommunications signal frequency band shown in Figure 1.
The radar apparatus is arranged to receive radar signals with signal frequencies within the S-band shown in Figure 1.
The radar apparatus has a duplexer unit (5) connected to a transmitter (6) arranged for generating radar signals having frequencies within the S-band, and is connected to a first receiver unit (7) arranged for receiving radar signals having frequencies within the S-band. The duplexer is also connected to a second receiver unit (15) arranged for receiving radar signals having frequencies outside the S-band and within a telecommunications signal frequency band shown in Figure 1. The RF signal input to the second receiver is obtained from the signal transmission line connecting the output of the duplexer to the first receiver. In particular, a directional coupler (14) is connected to the signal transmission line in question and is arranged to extract a small percentage of the RF signal thereon for input to the second receiver unit. This is for the purposes of detection of the presence of RF signals outside the frequency response band of the first receiver.
A detector unit (8) is arranged to receive the signals output from the second receiver unit (15) and therewith to detect the presence of received RF signals having a frequency lying within a signals having frequencies in the telecommunications signal frequency band shown in Figure 1. Concurrently, the detector unit is arranged to receive the signals output from the first receiver unit (7) and therewith to determine a measure of interference within RF signals within the signal frequency response band. The measure of the degree of signal interference is determined by measuring the power of the received signal from the first receiver unit.
The predetermined threshold is a predetermined signal power level threshold value above which, if received by the receiver (7) of the antenna system, will overload the receiver and cause it to operate/respond non-linearly to received RF signals -i.e. whereby the receiver output is not in direct/linear proportion to the received RE signal input power. The detector unit compares the measure of interference (signal power) with a predetermined threshold value (overload power level) and if the threshold is exceeded, the detector unit deems the interference levels to be unacceptable and generates a filter control signal.
The detector unit has a first output (9) upon which it outputs the input RF signal it received from the receiver unit (7) unchanged, and a second output (10) which is the filter control signal, both for input to a high-pass filter unit (11).
The filter unit is responsive to the filter control signal to apply a frequency high-pass signal blocking filter to the receiver output signal (9) received by the filter unit (11), and to not apply the filter when the filter control signal is otherwise absent.
The filter unit is arranged to apply the frequency filter during an azimuth range of width AO corresponding to the beam width of the antenna beam, centred on a frequency 60 corresponding to the azimuth of the directional antenna (2) when the antenna beam (3) is centred upon the detected azimuth of the interfering telecommunications signals -namely, the telecommunications tower (4). An azimuth signal (13) is transmitted continuously from the azimuth control parts of the directional antenna to the detector unit and the detector unit is arranged to determine/correlate the azimuth angles occupied by the antenna when the detector unit detects telecommunications signals via the second receiver unit (15).
Figure 3 graphically shows the state of the filter unit, in response to filter control signals (10), as a function of azimuth angle, indicating the detected azimuth of the telecommunications tower and the antenna beam width. The filter is controlled to be selectively applied during antenna azimuth angles in the range AO centred upon azimuth O. Figure 2 illustrates the spectral characteristic of the filter whereby a value 1.0 denotes full transmission and a value of 0.0 denotes no transmission (i.e. signal blocked). The filter is a high-pass filter which blocks the telecommunications band, and a lower part of the S-band. It can be seen that the narrow buffer zone separating the telecommunications signal frequency band from the radar S-band, is extended into the S-band. This extent may be an amount up to about 118th of the width of the S-band. Any further extension is likely to be detrimental to radar operations. It has been found that this extension is sufficient to amply remove the detrimental effects of interference from a neighbouring telecommunications band (e.g. 4G), but lesser extensions are also possible.
The embodiments described above are presented for illustrative purposes and it is to be understood that variations, modifications and equivalents thereto such as would be readily apparent to the skilled person are encompassed within the scope of the invention.
Claims (9)
- CLAIMS: 1. An antenna system comprising: a directional antenna adapted to rotate through a range of directions in azimuth and responsive to radio-frequency (RF) signals received from directions within said range of directions in azimuth; a receiver arranged to receive said RF signals from the antenna within a signal frequency response band of the receiver and to provide a corresponding output for signal processing; a signal filter operable to block a said output from the receiver when the frequency of the RF signal lies at a frequency within the signal frequency response band; a controller arranged to apply said signal filter when the directional antenna is directed to a predetermined azimuth and to not apply the signal filter otherwise.
- 2. An antenna according to any preceding claim in which the directional antenna is arranged to rotate periodically through 360 degrees and the controller is arranged to apply said signal filter periodically.
- 3. An antenna according to claim 2 in which with the controller is arranged to apply said signal filter with a periodicity corresponding to the rotation period of said directional antenna.
- 4. An antenna according to any preceding claim in which said predetermined azimuth is a predetermined range of azimuth angles.
- 5. An antenna according to any preceding claim in which said signal filter is a high-pass filter arranged to block said output from the receiver when the frequency of said RF signal lies below a threshold frequency defined by the signal filter.
- 6. A method for controlling a directional antenna system comprising: rotating a directional antenna through a range of directions in azimuth; receiving said RE signals from the antenna at a receiver responsive to radio-frequency (RF) signals within a signal frequency response band therewith to provide a corresponding output for signal processing; selectively blocking a said output from the receiver using a signal filter if the frequency of said RE signal lies at a frequency within said signal frequency response band; whereby the signal filter is applied if the directional antenna is directed to a predetermined azimuth and is not applied otherwise.
- 7. A method according to claim 6 including rotating the directional antenna periodically through 360 degrees applying said signal filter periodically.
- 8. A method according to any of claims 6 and 7 including applying said signal filter with a periodicity corresponding to the rotation period of said directional antenna.
- 9. A method according to any of claims 6 to 8 in which said predetermined azimuth is a predetermined range of azimuth angles.1O.A method according to any of claims 6 to 9 in which said signal filter is a high-pass filter, and therewith blocking said output from the receiver when the frequency of said RF signal lies below a threshold frequency defined by the signal filter.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1222830.0A GB2509060B (en) | 2012-12-18 | 2012-12-18 | Improvements in and relating to radar |
| BR112015014227A BR112015014227A2 (en) | 2012-12-18 | 2013-12-12 | antenna system and method for controlling a directional antenna system |
| PCT/GB2013/053262 WO2014096778A1 (en) | 2012-12-18 | 2013-12-12 | Improvements in and relating to radar |
| EP13805499.4A EP2936616B1 (en) | 2012-12-18 | 2013-12-12 | Improvements in and relating to radar |
| US14/653,104 US9851431B2 (en) | 2012-12-18 | 2013-12-12 | Radar |
| AU2013366159A AU2013366159B2 (en) | 2012-12-18 | 2013-12-12 | Improvements in and relating to radar |
| CL2015001691A CL2015001691A1 (en) | 2012-12-18 | 2015-06-16 | Improvements in and related to radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1222830.0A GB2509060B (en) | 2012-12-18 | 2012-12-18 | Improvements in and relating to radar |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201222830D0 GB201222830D0 (en) | 2013-01-30 |
| GB2509060A true GB2509060A (en) | 2014-06-25 |
| GB2509060B GB2509060B (en) | 2017-06-28 |
Family
ID=47630948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1222830.0A Expired - Fee Related GB2509060B (en) | 2012-12-18 | 2012-12-18 | Improvements in and relating to radar |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2509060B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4290268A1 (en) * | 2022-06-07 | 2023-12-13 | Honeywell International Inc. | Systems and methods for mitigating telecommunications signal interference to radar altimeters |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2270437A (en) * | 1992-09-07 | 1994-03-09 | Racal Res Ltd | Processing circuit |
| JPH1183983A (en) * | 1997-09-10 | 1999-03-26 | Japan Radio Co Ltd | Radar beam scanning method |
| US20080036645A1 (en) * | 2006-02-27 | 2008-02-14 | Chiharu Yamano | Electronic scanning radar apparatus |
| US20100019950A1 (en) * | 2006-12-27 | 2010-01-28 | Denso Corporation | Electronically scanned radar system |
| US20100136926A1 (en) * | 2008-12-03 | 2010-06-03 | Lackey Raymond J | Off-line channel tuning amplitude slope matched filter architecture |
| EP2390679A1 (en) * | 2010-05-27 | 2011-11-30 | Mitsubishi Electric R&D Centre Europe B.V. | Automotive radar with radio-frequency interference avoidance |
| US20110298651A1 (en) * | 2010-06-03 | 2011-12-08 | Kazuya Nakagawa | Method and device for processing signal, radar apparatus, and program for processing signal |
-
2012
- 2012-12-18 GB GB1222830.0A patent/GB2509060B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2270437A (en) * | 1992-09-07 | 1994-03-09 | Racal Res Ltd | Processing circuit |
| JPH1183983A (en) * | 1997-09-10 | 1999-03-26 | Japan Radio Co Ltd | Radar beam scanning method |
| US20080036645A1 (en) * | 2006-02-27 | 2008-02-14 | Chiharu Yamano | Electronic scanning radar apparatus |
| US20100019950A1 (en) * | 2006-12-27 | 2010-01-28 | Denso Corporation | Electronically scanned radar system |
| US20100136926A1 (en) * | 2008-12-03 | 2010-06-03 | Lackey Raymond J | Off-line channel tuning amplitude slope matched filter architecture |
| EP2390679A1 (en) * | 2010-05-27 | 2011-11-30 | Mitsubishi Electric R&D Centre Europe B.V. | Automotive radar with radio-frequency interference avoidance |
| US20110298651A1 (en) * | 2010-06-03 | 2011-12-08 | Kazuya Nakagawa | Method and device for processing signal, radar apparatus, and program for processing signal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4290268A1 (en) * | 2022-06-07 | 2023-12-13 | Honeywell International Inc. | Systems and methods for mitigating telecommunications signal interference to radar altimeters |
| US12468011B2 (en) | 2022-06-07 | 2025-11-11 | Honeywell International Inc. | Systems and methods for mitigating telecommunications signal interference to radar altimeters |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2509060B (en) | 2017-06-28 |
| GB201222830D0 (en) | 2013-01-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20181218 |