GB2503902A - A locating device - Google Patents
A locating device Download PDFInfo
- Publication number
- GB2503902A GB2503902A GB201212282A GB201212282A GB2503902A GB 2503902 A GB2503902 A GB 2503902A GB 201212282 A GB201212282 A GB 201212282A GB 201212282 A GB201212282 A GB 201212282A GB 2503902 A GB2503902 A GB 2503902A
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- GB
- United Kingdom
- Prior art keywords
- locating device
- signal
- antenna
- receive
- receive antenna
- 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
- 238000005259 measurement Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 8
- 238000010009 beating Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012360 testing method Methods 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
- 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
- G01S13/44—Monopulse radar, i.e. simultaneous lobing
- G01S13/4454—Monopulse radar, i.e. simultaneous lobing phase comparisons monopulse, i.e. comparing the echo signals received by an interferometric antenna arrangement
-
- 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
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
-
- 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
- G01S3/00—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
- G01S3/02—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 radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
- G01S3/48—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
A locating device for determining a bearing to an active target is disclosed. It comprises a radio frequency signal generator; a transmit-antenna arranged to transmit a first signal, which may be a microwave signal, generated by the signal generator; a receive-antenna arranged to receive a second signal from an active target, wherein the second signal is a retransmitted version of the first signal; and a signal comparator for comparing the first and second signals. The transmit- and receive-antennas are fixed beam antennas. One or both of the antennas may be substantially omni-directional, or azimuth, antennas. The receive-antenna is able to produce a plurality of separate phase outputs, and may be a crossed dipole, or a circular array antenna. The signal comparator receives the phase outputs from the receive antenna and generate a bearing to the target from the phase information. The system may also calculate a range to the target.
Description
A Locating Device
FIELD OF THE INVENTION
The invention relates to a locating device for determining a bearing to an active target.
More particularly, the invention relates to a locating device for determining both bearing and range to an active target.
BACKGROUND OF THE iNVENTION
It is known to use radar systems for local positioning in maritime applications, and as positions sensors for vehicle automation applications.
Three examples of radar-based systems used for maritime local positioning are Radius, Radasean and Symeo (all RTM5), all of which measure local position using radar and active targets. The Radius sensor measures range and bearing to active targets using a planar phase measurement over a receive angle of less than 180 degrees (typically 90 degrees). RadaSean measures range and bearing to active targets over 360 degrees but with the use of mechanical beam scanning and Symeo measures the range only to active targets with no bearing information (and so needs multiple targets for a location measurement).
In the literature, US 4,128,839, filed December 1978, describes the usc of a circular array to produce a narrow electronically scanned beam for aircraft beacon sensing.
The narrow fan shaped transmitted beam is swept with the use of phase shifters and a Butler matrix.
An aim of the invention is to improve upon existing locating devices and techniques, and in particular but not exclusively to create a locating device which has good bearing resolution over an acceptable receive angle, and which is smaller and cheaper to manufacture and operate than known devices and systems.
SUMMARY OF THE INVENTION
Generally speaking, the invention makes use of separate phase information from a signal received from an active target to find a bearing to the active target. Fixed beam antennas are used to remove the need to scan, reducing complexity and cost. Good coverage can be achieved of 180 degrees azimuth, and full 360 degree coverage by suitably removing ambiguity.
A first aspect of the invention provides a locating device for determining a bearing to an active target. The locating device comprises a radio frequency signal generator; a transmit antenna arranged to transmit a first signal generated by the radio frequency signal generator; a receive antenna arranged to receive a second signal from an active target, wherein the second signal is a retransmitted version of the first signal; and a signal comparator for comparing the first and second signals. The transmit antenna comprises a fixed beam antenna. The receive antenna comprises a fixed beam receive antenna able to produce a plurality of separate phase outputs. The signal comparator is configured to receive the phase outputs from the receive antenna and generate a bearing to the active target from the phase information.
In an exemplary embodiment, the receive antenna is a crossed dipole antenna. In an alternative embodiment, the receive antenna is a circular array antenna. Combinations of crossed dipoles and circular arrays maybe used.
Advantageously, one or both of the transmit antenna and the receive antenna are substantially omnidirectional antennas. One or both of the transmit antenna and receive antenna may be substantially azimuth antennas.
The radio frequency generator may be configured to generate a microwave signal. In particular, the radio frequency generator may be configured to generate a frequency modulated continuous wave (FMCW) signal.
To increase gain, the receive antenna may comprise a plurality of crossed dipole antennas.
To improve target recognition, the transmit antenna and the receive antenna may be configured to transmit and receive the first signal and the second signal, respectively, with different polarisations. The polarisations may be vertical and horizontal. In one example, thc transmit antenna is configured to transmit using vertical polarisation, and the receive antenna is configured to receive using horizontal polarisation.
To help remove ambiguity in the bearing calculation, the locating device comprises an absorbing sheet located proximal to the receive antenna to block incident radio frequency waves. To provide full coverage over 360 degrees of view, the locating device may comprise a second receive antenna on a side of the absorbing sheet opposite to the receive antenna.
Alternatively, or even additionally, the locating device may comprise a controller and memory arranged to create a movement history of the locating device and determine which of two possible bearings is most likely based on the movement history.
Alternatively, or even additionally, the locating device may comprise an input/output module and may be arranged to output information relating to two possible bearings and to receive an indication as to which of the two possible bearings is most accurate.
Alternatively, or even additionally, the locating device may comprise a further direction finding antenna which is used by the locating device to decide between two possible bearings.
In a particularly useful embodiment, the receive antenna is arranged to output a plurality of separate amplitude measurements and the comparator is arranged to receive the amplitude measurements and to generate a range to the active target.
A further aspect of the invention provides a method of determining a bearing to an active target. The method comprising generating a radio frequency signal; transmitting a first signal generated by the radio frequency signal generator; receiving a second signal from an active target, wherein the second signal is a retransmitted version of the first signal; and comparing the first and second signals in a signal comparator. The transmitting comprises transmitting through a fixed beam antenna.
The receiving comprises receiving through a fixed beam receive antenna able to produce a plurality of separate phase outputs. The comparing involves comparing the phase outputs from the receive antenna to generate a bearing to the active target from the phase information.
Other optional features of the method may be infened from the above discussion of the locating device, with appropriate modifications where necessary.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a block diagram illustrating a locating device according to an aspect of the invention; Figure 2 is a graph showing how the bearing of an active target may be determined using phase measurements; Figure 3 is an expanded schematic diagram showing further details of the locating device of Figure I; Figure 4 is an expanded schematic diagram showing further details of a receive antenna; Figure 5 is a schematic diagram showing a modified version of the locating device of Figure 1 using an RF reflector and additional receive antenna.
DETAILED DESCRIPTION OF EMBODIMENT(S)
Embodiments of the invention arc now more filly described, with reference to the figures listed above.
Figure 1 shows a locating device 10 embodying an aspect of the invention.
The locating device 1 0 comprises a radio frequency signal generator 20, a transmit antenna 30 arranged to transmit a first signal generated by the radio frequency signal generator 20, a receive antenna 40 arranged to receive a second signal from an active target 50, wherein the second signal is a retransmitted version of the first signal. The locating devicc 10 also compriscs a signal comparator 60 for comparing the first and sccond signals.
Thc transmit antcnna 30 is a fixed beam antenna. In this example, the transmit antenna 30 is a single dipole antenna arranged to transmit radio frequency waves predominantly omnidirectionally in azimuth.
The receive antenna 40 is also a fixed beam receive antenna able to produce a plurality of separate phase outputs. In this example, the receive antenna 40 is a crossed dipole antenna producing two phase outputs, one from each dipole.
Alternatively, it is considered that a circular array would also provide useful phase outputs.
The active target 50 is arranged to receive the first signal and to retransmit the first signal with some modulation. The modulation may be simple amplitude modulation, or single sideband frequency modulation, for example.
The signal comparator 60 is configured to receive the phase outputs from the receive antenna 40 and generate a bearing to the active target from the phase information. In this example the bearing, or angle of arrival, is calculated by comparing the phase of the received signals in each element, or dipole, of the crossed dipole receive antenna 40. The received signals containing the phase information are passed through a Butler matrix to reveal the bearing. The Butler matrix may be replaced by a digital signal proccssor (DSP) arranged to separately sample the received signals and digitally compare them.
Figure 2 is a graph showing how the bearing of an active target may be determined using phase measurements.
The graph shows measured results for a crossed dipole receive antenna 40 and illustrates how the phase from the two arms of the crossed dipole varies with angle of arrival of a received beam. The ideal phase response is plotted shown as 200, alongside the test results shown as 210 which show very good correlation. As can be seen, the phase difference (y-axis) increases substantially linearly with bearing (x-axis) with no phase difference at 0 degrees bearing, rising to 180 degrees phase differcncc at around 90 degrces bearing, and thcn dropping from -180 degrees phase difference at around 90 degrees bearing to 0 degrees phasc difference at 180 degrees bearing. This pattern repeats from 180 degrees bearing to 360 degrees bearing. As a result, there is a 180 degree ambiguity in the angle of arrival measurement. Ways to resolve this ambiguity, and other additional features of the locating device 10 are now discussed.
Figure 3 is an expanded schematic diagram showing further details of the locating device 10.
In particular, the locating device 10 comprises signal boosters 41 a and 41b which each respectively amplif' the signals derived from each arm of the crossed dipole receive antenna 40. 1st order and -1st order signals arc derived from the crossed dipole receive antenna 40. The amplified signals are fed to respective mixers 42a and 42b and the received signals are each mixed with the first signal from the radio frequency signal generator 20. The outputs of each mixer 42a and 42b are fed into the comparator 60, in this example, a digital signal processor. More specifically, the outputs of each mixer 42a and 42b are fed into respective fast Fourier transform (FFT) modules 62a and 62b of comparator 60. Once FET processing has taken place, one of the signals is conjugated, in this ease the -1st order signal from the crossed dipole receive antenna 40 before both signals are multiplied to create both range and bearing to the active target.
In the above paragraph amplitude measurements are used to generate a range to the active target as would be known to the skilled person.
To increase gain, the receive antenna 40 may comprise a plurality of crossed dipole antennas.
To improve target recognition, the transmit antenna 30 and the receive antenna 40 are configured to transmit and receive the first signal and the second signal, respectively, with different polarisations. The polarisations may be vertical and horizontal. Here, the transmit antenna 30 is configured to transmit using vertical polarisation, and the receive antenna 40 is configured to receive using horizontal polarisation.
Figure 4 is an expanded schematic diagram showing further details of a receive antenna 40. Here, the four arms of the crossed dipole are processed to generate the 1st and -1st order modes, later used for phase comparison to give the angle of arrival, or bearing to active target. The signal pairs from each dipole 44a, 44b are fed to respective 180 degree hybrids 46a, 46b, and the output of each 180 degree hybrid 46a, 4th is fed to a 90 degree hybrid 48 to generate the 1st and -1st order modes. It is the phase difference between these modes which indicates the bearing to the active target.
This arrangement is essentially an implementation of a Butler matrix.
Figure 5 is a schematic diagram showing a modified version of the locating device of Figure 1 using an RF reflector 49 and additional receive antenna 40B.
To help remove ambiguity in the bearing calculation, the locating device 10 comprises an absorbing sheet, or RF reflector located proximal to the receive antenna to block incident radio frequency waves. To provide full coverage over 360 degrees of view, the locating device comprises the second receive antenna 40B on a side of the absorbing sheet 49 opposite to the receive antenna 40. In this example, the second receive antenna 40B is a crossed dipole, but may be another suitable antenna type that can produce the necessary phase outputs. The RF reflector 49, or absorbing sheet, is a sheet of microwave absorbing material, commonly known as RAM.
In a modified or anothcr embodiment, the locating device comprises a controller and memory arranged to create a movement history of the locating device and determine which of two possible bearings is most likely based on the movement history.
In a modified or another embodiment, the locating device may comprise an input/output module and may be arranged to output information relating to two possible bearings and to receive an indication as to which of the two possible bearings is most accurate.
In a modified or another embodiment, the locating device may comprise a further direction finding antenna which is used by the locating device to decide between two possible bearings.
S
Thus, compared with the three prior art systems mentioned above, the invention equates to: * Radius with an Azimuth coveragc incrcascd to at least 180 dcgrees (nominally 360 degrees) with a single rcccive array.
* RadaScan without thc use of mcchanical scanning.
* Symeo with the addition of a bearing measurement so a singic target can be used.
A circular (or similar) array of patchcs can bc used to obtain the anglc of arrival but this can be difficult to construct. An embodiment of the invention applies the use of a simple crossed dipole antenna with circular array processing to obtain the angle of arrival in a radar systcm.
The invention operates over an angle of 360 degrees but with an ambiguity of 180 dcgrecs so, for example, thc beam could bc from +90 dcgrees or from -90 degrees or from +45 degrees or -135 degrees. This may not be significant in some applications (whcn thc approximatc dircction is known to start with and thc operator is able to select the correct target) but a number of solutions to deal with this ambiguity are also presented above.
The crossed dipole antenna is described in a number of text books including section 16-7 of "Antennas" by John D Kraus 1988 and "Antenna Engineering Handbook" second edition by Johnson and Jasik 1984.
Although the invention has been described above with reference to one or more proferred embodiments, it will be appreciated that various changes or modifications may be made without departing from the scope of the invention as defined in the appended claims.
Claims (16)
- Claims 1. A locating device for determining a bearing to an active target, the locating device comprising: a radio frequency signal generator; a transmit antenna arranged to transmit a first signal generated by the radio frequency signal generator; a receive antenna arranged to receive a second signal from an active target, wherein the second signal is a retransmitted version of the first signal; and a signal comparator for comparing the first and second signals; wherein: the transmit antenna comprises a fixed beam antenna, the receive antenna comprises a fixed beam receive antenna able to produce a plurality of separate phase outputs, and the signal comparator is configured to receive the phase outputs from the receive antenna and generate a bearing to the active target from the phase information.
- 2. The locating device of claim I, wherein the receive antenna is a crossed dipole antenna.
- 3. The locating device of claim 1, wherein the receive antenna is a circular array antenna.
- 4. The locating device of any preceding claim, wherein one or both of the transmit antenna and the receive antenna are substantially omnidirectional antennas.
- 5. The locating device of any preceding claim, wherein one or both of the transmit antenna and receive antenna are substantially azimuth antennas.
- 6. The locating device of any preceding claim, wherein the radio frequency generator is configured to generate a microwave signal.
- 7. The locating dcviee of any preceding claim, wherein the radio frequency generator is configured to generate a frequency modulated continuous wave (FMCW) signal.
- 8. The locating device of any preceding claim, wherein the receive antenna comprises a plurality of crossed dipole antennas.
- 9. The locating device of any preceding claim, wherein the transmit antenna and the receive antenna are configured to transmit and receive the first signal and the second signal, respectively, with different polarisations.
- 10. The locating device of any preceding claim, wherein the locating device comprises an absorbing sheet located proximal to the receive antenna to block incident radio frequency waves.
- II. The locating device of claim 10, wherein the locating device comprises a second receive antenna on a side of the absorbing sheet opposite to the receive
- 12. The locating device of any preceding claim, wherein the locating device comprises a controller and memory arranged to create a movement history of the locating device and determine which of two possible bearings is most likely based on the movement history.
- 13. The locating device of any preceding claim, wherein the locating device comprises an input/output module and is arranged to output information relating to two possible bearings and to receive an indication as to which of the two possible bearings is most accurate.
- 14. The locating device of any preceding claim, wherein the locating device comprises a further direction finding antenna which is used by the beating device to decide between two possible bearings.
- 15. The locating device of any preceding claim, wherein the receive antenna is arranged to output a plurality of separate amplitude measurements and the comparator is arranged to rcccivc the amplitude measurements and to generate a range to the active target.
- 16. A method of determining a bearing to an active target, the method comprising: generating a radio frequency signal; transmitting a first signal generated by the radio frequency signal generator; receiving a second signal m an active target, wherein the second signal is a retransmitted version of the first signal; and comparing thc first and second signals in a signal comparatoç wherein: the transmitting comprises transmitting through a fixed beam antenna, the receiving comprises receiving thmugh a fixed beam receive antenna able to produce a plurality of separate phase outputs, and the comparing involves comparing the phase outputs fixm the receive antenna to generate a bearing to the active target from the phase inlbrmation.Claims I. A locating device for determining a bearing to an active target, the locating device comprising: a radio frequency signal generator; a transmit antenna arranged to transmit a first signal generated by the radio frequency signal generator; a receive antenna arranged to receive a second signal from an active target, wherein the second signal is a retransmitted version of the first signal; and a signal comparator for comparing the first and second signals; wherein: the transmit antenna comprises a fixed beam antenna, the receive antenna comprises a crossed dipole or circular array antenna able to produce a plurality of separate phase outputs, and the signal comparator is configured to receive the phase (Q outputs from the receive antenna and generate a bearing to the active target from the CJ 15 phase information.2. The locating device of any preceding claim, wherein one or both of the transmit antenna and the receive antenna are substantially omnidirectional antennas.3. The locating device of any preceding claim, wherein one or both of the transmit antenna and receive antenna are substantially azimuth antennas.4. The locating device of any preceding claim, wherein the radio frequency generator is configured to generate a microwave signal.5. The locating device of any preceding claim, wherein the radio frequency generator is configured to generate a frequency modulated continuous wave (FMCW) signal.6. The locating device of any preceding claim, wherein the receive antenna comprises a plurality of crossed dipole antennas.7. The locating device of any preceding claim, wherein the transmit antenna and the receive antenna are configured to transmit and receive the first signal and the second signal, respectively, with different polarisations, 8. The locating device of any preceding claim, wherein the locating device comprises an absorbing sheet located proximal to the receive antenna to block incident radio frequency waves.9. The locating device of claim 10, wherein the locating device comprises a second receive antenna on a side of the absorbing sheet opposite to the receive antenna.10. The locating device of any preceding claim, wherein the locating device comprises a controller and memory arranged to create a movement history of the locating device and determine which of two possible bearings is most likely based C") on the movement history.r t 1. The locating device of any preceding claim, wherein the locating device comprises an input/output module and is arranged to output information (Q relating to two possible bearings and to receive an indication as to which of the two C'tJ possible bearings is most accurate.t2. The locating device of any preceding claim, wherein the locating device comprises a thrther direction finding antenna which is used by the locating device to decide between two possible beatings.13. The locating device of any preceding claim, wherein the receive antenna is arranged to output a plurality of separate amplitude measurements and the comparator is arranged to receive the amplitude measurements and to generate a range to the active target.14. A method of determining a bearing to an active target, the method comprising: generating a radio frequency signal; transmitting a first signal generated by the radio frequency signal generator; receiving a second signal from an active target, wherein the second signal is a retransmitted version of the first signal; and comparing the first and second signals in a signal comparator; wherein: the transmitting comprises transmitting through a fixed beam antenna, the receiving comprises receiving through a crossed dipole antenna or circular array antenna able to produce a plurality of separate phase outputs, and the comparing involves comparing the phase outputs from the receive antenna to generate a bearing tO to the active target from the phase information. r r (0 (4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201212282A GB2503902B (en) | 2012-07-10 | 2012-07-10 | A locating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201212282A GB2503902B (en) | 2012-07-10 | 2012-07-10 | A locating device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201212282D0 GB201212282D0 (en) | 2012-08-22 |
| GB2503902A true GB2503902A (en) | 2014-01-15 |
| GB2503902B GB2503902B (en) | 2014-06-04 |
Family
ID=46766444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB201212282A Active GB2503902B (en) | 2012-07-10 | 2012-07-10 | A locating device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2503902B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2812273C1 (en) * | 2023-07-11 | 2024-01-29 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Военный учебно-научный центр Военно-воздушных сил "Военно-воздушная академия имени профессора Н.Е. Жуковского и Ю.А. Гагарина" (г. Воронеж) Министерства обороны Российской Федерации | Method for determining direction to radiation source with phase direction finder |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1046870A (en) * | 1962-10-08 | 1966-10-26 | Thomson Houston Comp Francaise | Improvements in and relating to radio-location systems |
| GB1145783A (en) * | 1965-04-30 | 1969-03-19 | Int Standard Electric Corp | Radar system for measuring position and velocity of a distant object |
| EP0249493A2 (en) * | 1986-06-13 | 1987-12-16 | Cossor Electronics Limited | Aircraft collision warning system |
| US4728955A (en) * | 1984-07-04 | 1988-03-01 | Stiftelsen Institutet For Mikrovagsteknik Vid Tekniska Hogskolan I Stockholm | Method for position-finding and apparatus herefor |
| WO2005088343A1 (en) * | 2004-03-15 | 2005-09-22 | Kongsberg Seatex As | Method and system for determining the position of marine vessels and similar objects |
-
2012
- 2012-07-10 GB GB201212282A patent/GB2503902B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1046870A (en) * | 1962-10-08 | 1966-10-26 | Thomson Houston Comp Francaise | Improvements in and relating to radio-location systems |
| GB1145783A (en) * | 1965-04-30 | 1969-03-19 | Int Standard Electric Corp | Radar system for measuring position and velocity of a distant object |
| US4728955A (en) * | 1984-07-04 | 1988-03-01 | Stiftelsen Institutet For Mikrovagsteknik Vid Tekniska Hogskolan I Stockholm | Method for position-finding and apparatus herefor |
| EP0249493A2 (en) * | 1986-06-13 | 1987-12-16 | Cossor Electronics Limited | Aircraft collision warning system |
| WO2005088343A1 (en) * | 2004-03-15 | 2005-09-22 | Kongsberg Seatex As | Method and system for determining the position of marine vessels and similar objects |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2812273C1 (en) * | 2023-07-11 | 2024-01-29 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Военный учебно-научный центр Военно-воздушных сил "Военно-воздушная академия имени профессора Н.Е. Жуковского и Ю.А. Гагарина" (г. Воронеж) Министерства обороны Российской Федерации | Method for determining direction to radiation source with phase direction finder |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201212282D0 (en) | 2012-08-22 |
| GB2503902B (en) | 2014-06-04 |
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