KR20170050109A - Multi-caf map location estimation method of beacon in cospas-sarsat meosar system - Google Patents

Multi-caf map location estimation method of beacon in cospas-sarsat meosar system Download PDF

Info

Publication number
KR20170050109A
KR20170050109A KR1020150151202A KR20150151202A KR20170050109A KR 20170050109 A KR20170050109 A KR 20170050109A KR 1020150151202 A KR1020150151202 A KR 1020150151202A KR 20150151202 A KR20150151202 A KR 20150151202A KR 20170050109 A KR20170050109 A KR 20170050109A
Authority
KR
South Korea
Prior art keywords
beacon
caf
distress signal
satellites
terrestrial
Prior art date
Application number
KR1020150151202A
Other languages
Korean (ko)
Other versions
KR101752723B1 (en
Inventor
안우근
김재현
이상욱
Original Assignee
국방과학연구소
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 국방과학연구소 filed Critical 국방과학연구소
Priority to KR1020150151202A priority Critical patent/KR101752723B1/en
Publication of KR20170050109A publication Critical patent/KR20170050109A/en
Application granted granted Critical
Publication of KR101752723B1 publication Critical patent/KR101752723B1/en

Links

Images

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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/14—Receivers specially adapted for specific applications
    • G01S19/17—Emergency applications
    • 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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/04—Details
    • G01S1/042—Transmitters
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0269—System arrangements wherein the object is to detect the exact location of child or item using a navigation satellite system, e.g. GPS
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0272—System arrangements wherein the object is to detect exact location of child or item using triangulation other than GPS

Abstract

The present invention can estimate the position of incoming distress signals at the same time, solve problems of CAF (Cross Ambiguity Function) MAP when applied to a medium earth orbit satellite, To a position estimation method.

Description

[0001] MULTI-CAF MAP LOCATION ESTIMATION METHOD OF BEACON IN COSPAS-SARSAT MEOSAR SYSTEM [0002]

The present invention relates to a method for estimating beacon position estimation of multiple CAF MAPs (reflecting beacon position on a map) in a COSPAS-SARSAT MEOSAR system.

In general, the Search and Rescue (SAR) was established in 1979 as a private initiative by the United States, France, Canada, and Russia. The Commission then established a commission and operated terrestrial systems including satellite in the name of COSPAS-SARSAT . In the initial stage, the service using low-earth orbit satellite and geostationary satellite has been provided. However, in order to increase the number of terminals and increase the availability, a second-generation search structure system using middle earth orbit satellite is being developed. In the second generation navigation system, the satellite repeater provides services to the newly launched satellite orbiting satellites of the participating countries, such as US GPS, GLONASS in Russia and GALILEO satellite in EU.

 The second-generation search-and-rescue system uses the TOA (Time of Arrival) of the distress signal arriving at each satellite using MEANUT (Medium-Earth Orbit Local User Terminal) And FOA (Frequency of Arrival) measurements are independently calculated to estimate the beacon position. However, this method is disadvantageous in that, when a beacon signal is transmitted at an arbitrary point in time at 50 second intervals in a large distress situation such as a multi - ship collision, it is difficult to estimate the position when disturbance signals overlap or communication disturbance by an illegal radio transmission source interferes. It is difficult to estimate the location of jammers by using satellite in the case where there are several jammers of the same type such as a CW signal,

SUMMARY OF THE INVENTION It is an object of the present invention to provide a COSPAS-SARSAT which can estimate the positions of incoming distress signals and solve the problems of CAF (Cross Ambiguity Function) And to provide a method of estimating multiple CAF MAP beacon positions in a MEOSAR system (medium orbit search system).

A beacon position estimation method of a heavy earth orbit search system according to an embodiment of the present invention includes:

A beacon for transmitting a distress signal in a distress situation, a mid-orbit communication relay unit for receiving the distress signal in a middle orbit and transmitting the distress signal to a terrestrial receiver, and a control unit for receiving the distress signal from the mid- A terrestrial reception unit for estimating a location of an illegal radio transmission source through a multiple ambience function (CAF) MAP scheme; a mission control unit for receiving a location request of the beacon and transmitting a rescue request; A beacon position estimation method of a medium orbit search system including a structure adjustment unit for dispatching a beacon to a position of the beacon,

Performing a CAF MAP algorithm when the terrestrial receiver receives the beacon distress signal received from the two satellites and the position and velocity information of the two satellites;

 Setting the search area for the location of the beacon based on the received beacon distress signal and location and speed information for the two satellites;

Wherein the terrestrial receiving unit generates a Time Difference of Arrival (TDOA) and a Frequency Difference of Arrival (FDOA) lookup table between the coordinates of each point (Grid) of the search area and the satellite coordinates;

The terrestrial receiving unit reflects a CAF result value of the beacon distress signal and position and speed information of each satellite received from the two satellites in the search area and selects a maximum value among the points of the search area reflecting the CAF result value Determining that the point having the beacon is the location of the beacon.

In the embodiment of the present invention, the step of determining the position of the beacon may include: determining whether the terrestrial receiving unit is larger than the reference value; And determining that the location corresponding to the maximum value is the location of the beacon if the maximum value is greater than the reference value.

The multiple CAF MAP beacon position estimation method in the COSPAS-SARSAT MEOSAR system according to the embodiment of the present invention can estimate the position of the incoming distress signals at the same time, and when applied to the middle earth orbit satellite, the CAF (Cross Ambiguity Function) And the position estimation performance can be improved. The CAF MAP method is based on the geometry of two satellites selected for application to the MEOSAR, and the accuracy of the position estimation is changed every time, and the distress signal at intervals of 50 seconds must be processed at least 20 times COSPAS-SARSAT is not in a situation where it can not satisfy the 5 minutes of distress rescue time. If the CAF MAP between the satellites receiving the distress signal through the multiple CAF MAP is performed a plurality of times, it is possible to obtain the effect of improving the accuracy of position estimation and shortening the structure time with one distress signal or a few distress signals.

FIG. 1 is a conceptual diagram of a mid-orbit search system to which a multiple CAF MAP beacon position estimation method according to an embodiment of the present invention is applied.
2 is a flowchart illustrating a beacon position estimation method using a CAF-MAP algorithm.
FIG. 3 is a graph illustrating a result of mapping a CAF result on a map according to an embodiment of the present invention.
4 is a flowchart illustrating a multiple CAF MAP method applied to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or similar elements are denoted by the same reference numerals, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

FIG. 1 is a conceptual diagram of a mid-orbit search system to which a multiple CAF MAP beacon position estimation method according to an embodiment of the present invention is applied.

As shown in Fig. 1, in the middle orbit search system according to the present invention,

A beacon (11) for transmitting a distress signal in a distress situation,

(Orbital communication relay station) 12 for receiving the distress signal in a middle orbit and transmitting the distress signal to a terrestrial reception unit (terrestrial reception station) 13,

(Ground receiving station) that receives the distress signal from the mid-orbit communication relay unit 12 (intermediate orbit communication relay station) 12 and estimates the position (position information) of the beacon 11 or the position of the illegal radio transmission source through the multiple CAF MAP technique ) 13,

A mission control unit (task control center) 14 for receiving the position information of the beacon 11 and transmitting a rescue request,

And a restructuring unit (restructuring headquarters) 15 for dispatching a rescue unit to the beacon 11 according to a request of the mission control unit 14.

The CAF MAP scheme was formally implemented by Glenn D. Hartwell. Unlike the conventional method of estimating the location of beacons using TOA and FOA for each location, CAF (Cross Ambiguity Function) . In the conventional method, it is difficult to find the position of the beacons and the position of the jammers at the same time when a distress signal is inputted simultaneously or an interference signal such as a jamming signal is inputted in different beacons. Therefore, the TDOA (Time Difference of Arrival) and the FDOA (Frequency Difference of Arrival) information of the transmission signals are included in the result of the cross correlation between the signals received by the respective receivers, Points can be used to locate all transmitters.

2 is a flowchart illustrating a beacon position estimation method using a CAF-MAP algorithm.

The terrestrial receiving unit 13 performs a CAF MAP algorithm and determines whether a beacon distress signal received from the two satellites and information (position and speed information) about the two satellites are acquired (S11). The terrestrial receiving unit 13 performs a CAF MAP algorithm, checks whether the beacon distress signal received from the two satellites and the position and velocity information of the two satellites are acquired, and continues the CAF MAP algorithm upon acquisition.

Thereafter, the terrestrial receiving unit 13 sets a search area for the beacon distress position based on the received beacon distress signal and position and velocity information for the two satellites (S12).

Ground receiving unit 13 is [X G, Y G, Z G] coordinates and satellite coordinates [X s, Y s, Z s] TDOA and FDOA table (Lookup Table) liver for each point (Grid) in the search area (S13).

The terrestrial receiving unit 13 performs a cross correlation between acquired data (received signal data for each level) received via two satellites (cross correlation between two satellites using two received signal data for two satellites) (Step S14). In step S14, the beacon distress signal received from the two satellites and the position and velocity information of each satellite are calculated.

The ground receiving unit 13 generates a CAF result value corresponding to the beacon distress location when calculating the CAF for the beacon distress signal received from the two satellites and the position and speed information for each satellite, (X, Y, Z) of the search area by mapping the values to the TDOA and FDOA tables (S15).

CAF result values generated by repeating the above process (the process from S11 to S15) every time a beacon distress signal received from the two satellites and position and speed information about each satellite are received, are accumulated in a search area (MAP) (The CAF result values are mapped onto a map), the average of the accumulated CAF result values is obtained, the calculated average CAF result value is reflected in the search area, and the search (Position estimation succeeds) as a position having the maximum value (the value of the position of the actual beacon (the value of the absolute coordinates (X, Y, Z) of the beacon) among the respective points of the region as the position of the beacon.

FIG. 3 is a graph illustrating a result of mapping a CAF result on a map according to an embodiment of the present invention.

As shown in FIG. 3, it can be seen that the value of a specific point is the maximum value when looking at each point of the search area where the average CAF result is reflected. If the correlation results are arranged according to the TDOA / FDOA table in the coordinates of the search area, the specific points have larger values as they are repeated.

The ground receiving unit 13 determines whether the value of the maximum value (the value of the absolute coordinates (X, Y, Z) of the point where the actual beacon (beacon (X, Y, Z)) is larger than the reference value among the points of the search area in which the average CAF result value is reflected (S16). If the maximum value is larger than the reference value, it is determined that the position corresponding to the maximum value is the position of the beacon (S17).

If the maximum value is smaller than the reference value, the terrestrial reception unit 13 performs an algorithm for the distress signal due to the next burst.

When applied to a search satellite, it has a problem that the accuracy varies depending on the position calculation time with respect to the selected satellite among the various satellites. Therefore, the multi CAF MAP scheme is used to perform the position estimation.

4 is a flowchart illustrating a multiple CAF MAP method applied to the present invention.

The terrestrial receiving unit 13 performs a multiple CAF MAP technique and determines whether a distress signal is received from at least four or more satellites (S21). At this time, the terrestrial receiver 13 confirms whether the distress signal transmitted from the satellites of various satellites and the position and velocity information of each satellite are acquired, and the algorithm is continuously executed upon acquisition.

The terrestrial receiver 13 performs CAFs between different satellites for one burst distress signal, and outputs two different signals to each satellite so that all satellites (for example, at least four phases that received the distress signal) It is determined whether the satellites are selected (S22).

Thereafter, when the two different satellites are selected, the terrestrial receiving unit 13 sets a search area for the beacon disturbance position (S23)

Ground receiving unit 13 is [X G, Y G, Z G] coordinates and satellite coordinates [X s, Y s, Z s] TDOA and FDOA table (Lookup Table) liver for each point (Grid) in the search area (S24).

Thereafter, the terrestrial receiving unit 13 calculates the disturbance signal received from the two satellites and the CAF for the position and velocity information of the two satellites (S25).

The ground receiving unit 13 generates a CAF result corresponding to the search area for the beacon distress position when calculating the CAF for the distress signal received from the two satellites and the position and speed information for the two satellites, To the TDOA and FDOA tables, thereby generating a new [X, Y, Z] for each point (S26).

The terrestrial receiver 13 performs the mapping for all the satellite combinations, accumulates the results, and obtains an average of the accumulated results. Thus, the value of the point (position) at which the actual beacon is located becomes larger and a peak for the position can be found. At this time, the terrestrial receiving unit 13 determines whether the maximum value of the peak is larger than the reference value (S27).

If the maximum value of the peak is larger than the reference value, the terrestrial receiving unit 13 determines that the position corresponding to the maximum value is the position of the beacon (i.e., the position estimation is successful) (S28).

The ground receiving unit (13) If the maximum value is smaller than the reference value, the algorithm is executed again for the distress signal due to the next burst.

As described above, the multiple CAF MAP beacon position estimation method in the COSPAS-SARSAT MEOSAR system according to the embodiment of the present invention can estimate the position of the incoming distress signals at the same time, (Cross Ambiguity Function) MAP, and improve the position estimation performance. The CAF MAP method is based on the geometry of two satellites selected for application to the MEOSAR, and the accuracy of the position estimation is changed every time, and the distress signal at intervals of 50 seconds must be processed at least 20 times COSPAS-SARSAT is not in a situation where it can not satisfy the 5 minutes of distress rescue time. If the CAF MAP between the satellites receiving the distress signal through the multiple CAF MAP is performed a plurality of times, it is possible to obtain the effect of improving the accuracy of position estimation and shortening the structure time with one distress signal or a few distress signals.

The foregoing detailed description should not be construed in all aspects as limiting and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (2)

A beacon for transmitting a distress signal in a distress situation, a mid-orbit communication relay unit for receiving the distress signal in a middle orbit and transmitting the distress signal to a terrestrial reception unit, and a communication unit for receiving the distress signal from the mid- A terrestrial reception unit for estimating a location of an illegal radio transmission source through a multiple ambience function (CAF) MAP scheme; a mission control unit for receiving a location request of the beacon and transmitting a rescue request; A beacon position estimation method of a medium orbit search system,
Performing a CAF MAP algorithm when the terrestrial receiver receives the beacon distress signal received from the two satellites and the position and velocity information of the two satellites;
Setting the search area for the location of the beacon based on the received beacon distress signal and location and speed information for the two satellites;
Wherein the terrestrial receiving unit generates a Time Difference of Arrival (TDOA) and a Frequency Difference of Arrival (FDOA) lookup table between the coordinates of each point (Grid) of the search area and the satellite coordinates;
The terrestrial receiving unit reflects a CAF result value of the beacon distress signal and the position and speed information of each satellite received from the two satellites in the search area and selects a maximum value among the points of the search area reflecting the CAF result value And determining that the point having the beacon position is a position of the beacon. 2. The method of claim 1, wherein determining the location of the beacon comprises:
Wherein the ground receiving unit determines whether the maximum value is greater than a reference value;
And determining that the position corresponding to the maximum value is a position of the beacon if the maximum value is greater than the reference value.
KR1020150151202A 2015-10-29 2015-10-29 Multi-caf map location estimation method of beacon in cospas-sarsat meosar system KR101752723B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150151202A KR101752723B1 (en) 2015-10-29 2015-10-29 Multi-caf map location estimation method of beacon in cospas-sarsat meosar system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150151202A KR101752723B1 (en) 2015-10-29 2015-10-29 Multi-caf map location estimation method of beacon in cospas-sarsat meosar system

Publications (2)

Publication Number Publication Date
KR20170050109A true KR20170050109A (en) 2017-05-11
KR101752723B1 KR101752723B1 (en) 2017-06-30

Family

ID=58741290

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150151202A KR101752723B1 (en) 2015-10-29 2015-10-29 Multi-caf map location estimation method of beacon in cospas-sarsat meosar system

Country Status (1)

Country Link
KR (1) KR101752723B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190124563A (en) * 2018-04-26 2019-11-05 국방과학연구소 Positioning system and method capable of improving positioning performance at low power
KR20200011318A (en) * 2018-07-24 2020-02-03 인하대학교 산학협력단 Unidentified cospas-sarsat beacon location estimation method and system
KR20200041200A (en) * 2018-10-11 2020-04-21 국방과학연구소 Apparatus and method for estimating target position

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9919525D0 (en) * 1999-08-19 1999-10-20 Secr Defence Method and apparatus for locating the source of an unknown signal
CN104849737B (en) * 2015-04-28 2019-01-15 中国电子科技集团公司第三十六研究所 A kind of global position system and localization method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190124563A (en) * 2018-04-26 2019-11-05 국방과학연구소 Positioning system and method capable of improving positioning performance at low power
KR20200011318A (en) * 2018-07-24 2020-02-03 인하대학교 산학협력단 Unidentified cospas-sarsat beacon location estimation method and system
KR20200041200A (en) * 2018-10-11 2020-04-21 국방과학연구소 Apparatus and method for estimating target position

Also Published As

Publication number Publication date
KR101752723B1 (en) 2017-06-30

Similar Documents

Publication Publication Date Title
JP4550872B2 (en) Method and apparatus for determining error estimates in a hybrid position determination system
CA2333351C (en) A method and device for creating a network positioning system (nps)
AU2010289870B2 (en) Single frequency user ionosphere system and technique
AU708274B2 (en) Locating the source of an unknown signal
US8456353B2 (en) Method and system for determining clock corrections
US5365447A (en) GPS and satelite navigation system
US9019155B2 (en) Global positioning system (GPS) and doppler augmentation (GDAUG) and space location inertial navigation geopositioning system (SPACELINGS)
US6922546B1 (en) GPS signal acquisition based on frequency-domain and time-domain processing
KR20010098736A (en) Obtaining pilot phase offset time delay parameter for a wireless terminal of an integrated wireless-global positioning system
JP2000249754A (en) Jamming detection and blanking for gps receiver
JP2023509731A (en) Uncoordinated Positioning, Navigation, and Timing Extraction from VSAT Communication Signals Using Multibeam Phased Array Antennas
KR101607082B1 (en) System and method of ionospheric delay estimation for extending the coverage of differential satellite navigation
US10444371B2 (en) Interference geolocation using a satellite constellation
KR101752723B1 (en) Multi-caf map location estimation method of beacon in cospas-sarsat meosar system
JP2002071782A (en) Information terminal with positioning function
EP3757620A1 (en) Systems for and methods of nullsteering in a receiver
US7142159B1 (en) Pseudolite navigation system
JP2006132949A (en) Positioning device, positioning method and positioning program
Cookman et al. Single chip receiver for GNSS and LEO constellations
CN109425871B (en) Satellite navigation system and method based on low-earth-orbit satellite constellation and C-band joint navigation signal
JP2005195347A (en) Direction search sensor, and radio wave emission source position estimation system
García-Molina et al. Multi-layer pnt solutions for harsh user conditions
KR20200011318A (en) Unidentified cospas-sarsat beacon location estimation method and system
AU749029B2 (en) A method and device for creating a network positioning system (NPS)
JP2002006027A (en) Method for obtaining reciprocating delay time (rtd) for ratio terminal of wireless network global positioning integrating (wgp) system

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant