CN104618088A - ADS-B (Automatic Dependent Surveillance-Broadcast) signal based wide-area multi-station time synchronizing method - Google Patents

ADS-B (Automatic Dependent Surveillance-Broadcast) signal based wide-area multi-station time synchronizing method Download PDF

Info

Publication number
CN104618088A
CN104618088A CN201410576649.8A CN201410576649A CN104618088A CN 104618088 A CN104618088 A CN 104618088A CN 201410576649 A CN201410576649 A CN 201410576649A CN 104618088 A CN104618088 A CN 104618088A
Authority
CN
China
Prior art keywords
station
ads
time
data
synchronized
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
Application number
CN201410576649.8A
Other languages
Chinese (zh)
Other versions
CN104618088B (en
Inventor
唐小明
张涛
金林
朱洪伟
李洪高
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Naval Aeronautical University
Original Assignee
YANTAI SANHANG RADAR SERVICE TECHNOLOGY RESEARCH INSTITUTE Co Ltd
Naval Aeronautical Engineering Institute of PLA
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 YANTAI SANHANG RADAR SERVICE TECHNOLOGY RESEARCH INSTITUTE Co Ltd, Naval Aeronautical Engineering Institute of PLA filed Critical YANTAI SANHANG RADAR SERVICE TECHNOLOGY RESEARCH INSTITUTE Co Ltd
Priority to CN201410576649.8A priority Critical patent/CN104618088B/en
Publication of CN104618088A publication Critical patent/CN104618088A/en
Application granted granted Critical
Publication of CN104618088B publication Critical patent/CN104618088B/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses an ADS-B (Automatic Dependent Surveillance-Broadcast) signal based wide-area multi-station time synchronizing method. The method is characterized in that an auxiliary station to be synchronized and a central state synchronously receive an ADS-B signal carrying the airplane location information, and the local timestamp is marked; a basic model ad an error model of the time reference difference are created and calculated to obtain the method for synchronizing the wide-area multi-station time and the optimizing method for reducing the synchronizing error through an ADS-B location message marked with the timestamp; the obtained ADS-B data are divided by batches, sieved and evaluated in quality; the data meeting the requirement are selected and substituted into the model to calculate so as to obtain the time reference difference of the auxiliary station and the central station; then the central data is corrected during processing the data, so as to finish the time synchronizing of all auxiliary stations and the central station. According to the method, the time synchronizing is accurately performed for multi-station systems with any quantity according to the existing known signal resource; the method has an important practical value.

Description

Based on the wide area multistation method for synchronizing time of ADS-B signal
One, technical field
The present invention relates to wide area multistation time synchronized field in multiple spot positioning using TDOA, be specially a kind of wide area multistation and jointly receive aerial ADS-B signal, filter out suitable batch, utilize the positional information of aircraft in the timestamp and ADS-B message stamped, evaluate time reference difference between wide area multistation and carry out synchronous method.
Two, background technology
In passive location field, the plurality of advantages such as multiple spot positioning using TDOA is high with its positioning precision, wide coverage, and networking is simple and convenient, antijamming capability is strong become a kind of topmost multipoint positioning mode, and civilian or military affairs are all widely used.Technology based on the multipoint positioning most critical of the time difference is the exact time synchronization between multistation, and this is the basic premise that can whole navigation system effectively work.When station spacing is not very large, time synchronized can be carried out by the mode of physical connection (as optical fiber), and when station spacing is larger, no matter such way is not a good selection from cost, difficulty of construction or risk, but also can only for fixing multistation.General way is, increases the fixed transmission station of a known location, synchronous between multistation.This method comparatively physical connection Synchronos method has greater advantage, can realize wide area flexibly synchronous, be not limited to fixing multistation.But increase a cell site and be not only embodied in increase erection and maintenance cost for synchronous inferior position, in Military Application, lose the concealed advantage of passive location simultaneously, utilize at the electromagnetic spectrum of growing tension and be also difficult to accomplish electromagnetic compatibility completely.In addition, wide area multistation also often adopts GPS altogether depending on realizing time synchronized, and the synchronization accuracy of this mode, in tens nanoseconds, makes positioning precision greatly limited, and is limited by other country based on the method for gps system, can not ensure in the availability of unusual time.Seek a kind ofly to realize the mechanism of accurate wide area multistation time synchronized by significant when not increasing synchronized transmissions station, when not being limited by other country's system.
In current spatial domain, course line spreads all over, and has ten hundreds of aircrafts every day in flight, except overhead, ocean almost can not find a slice not have fly past in tens kilometers of border circular areas that are radius.All aircrafts are electromagnetic radiation signal all outwards, and the commercial aircraft of great majority (later can be more) is all provided with ADS-B system, initiatively reports the position of self with 1090ES Data-Link.This is the precondition utilizing ADS-B signal to carry out multistation time synchronized.Multistation by the ADS-B signal in real-time reception spatial domain, stamp timestamp, and construct Signal transmissions model and error model, data through some batch of choose reasonable carry out reference difference computing time, finally revise the time reference of extension station, realize the exact time synchronization of multistation.This wide area multistation method for synchronizing time based on ADS-B signal greatly reduces erection and operation cost, the fail safe that improve system and disguise, and economy and military affairs have very huge meaning.
Three, summary of the invention
The object of this invention is to provide a kind of existing ADS-B signal in the air that utilizes and wide area multistation is carried out to the method for exact time synchronization, in order to when not increasing system complexity, improving the precision of multistation time synchronized.There is common factor in the extension station that application claims is to be synchronized and the reception spatial domain of central station to ADS-B signal, with ensure to have when extension station and central station carry out time synchronized altogether depending on the aircraft that ADS-B is housed.
The invention provides a kind of existing ADS-B signal in the air that utilizes and wide area multistation is carried out to the method for exact time synchronization, comprising:
(1) wide area multistation receives ADS-B signal and stamps local time stamp, and the message stamping local time stamp is sent to central station by original channel;
(2) select the ADS-B message that extension station to be synchronized and central station all receive, it undertaken in batches by No. ICAO, be chosen at same section of course line have data batch;
(3) according to position message amount, continuity, navigation accuracy grade three parameters, comprehensive assessment is carried out to the lot data selected in (2), carry out prioritization according to assessment result;
(4) the one group of data (comprising the data of at least one batch) met the demands are selected;
(5) by the data of each batch in (4) according to ADS-B Signal transmissions model and the sample of time reference difference between error model computer center station and certain extension station to be synchronized, and the weights of the time reference difference sample that each lot data calculates are set according to the prioritization in (3);
(6) according to the time reference difference in (5) and weights, the time reference estimating this extension station to be synchronized and central station is poor;
(7) obtain the time reference correction to corresponding extension station according to the result in (6), when central station carries out data processing, this correction is all added to the time stab information from corresponding extension station, with unified to central station time reference;
(8) other extension stations are synchronized to central station one by one according to (5) ~ (7) step, complete multistation time synchronized.
The present invention is on existing wide area multiple station systems basis, increase ADS-B receiving function, the aircraft that ADS-B system is housed is brought in system and carries out modeling, calculate the time difference of extension station and main website, realize the time synchronized of wide area multistation, efficiently solve the problem that wide area multistation time synchronized is difficult and synchronization accuracy is not high, there is huge military value and economic benefit.
Four, accompanying drawing explanation
Fig. 1 is the present invention extension station to be synchronized and central station time synchronized flow chart
Fig. 2 is ADS-B Signal transmissions figure of the present invention
Fig. 3 is time reference of the present invention difference computation model schematic diagram
Five, specific implementation method
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, carry out clear intactly describing to technical scheme of the present invention.Owing to being concrete to the elaboration of embodiment, all embodiments of the present invention can not be contained, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making innovative labor, all belong to protection scope of the present invention.
Fig. 1 is extension station to be synchronized of the present invention and central station time synchronized flow chart.Extension station to be synchronized and central station receive the ADS-B signal in spatial domain separately, stamp the local time stamp at each station respectively, by legacy data passage, the ADS-B message with time stamp are sent to central station.At central station, Data Source mark is carried out to the ADS-B message from each extension station, come from that receiving station to distinguish.ADS-B message that their jointly receive is carried out in batches according to No. ICAO, and filter out to have on same section of course line data of having a try batch.Batch carry out data quality accessment according to the navigation accuracy of position message amount, message continuity and ADS-B system to what filter out, carry out prioritization according to assessment result.Judge whether to meet the demands batch, if had, data are substituted in the time difference computation model time reference calculating each extension station to be synchronized and central station poor, if do not meet the demands batch, then continue the admission waiting for more data.When obtaining the time reference difference (estimated value) of all extension stations to be synchronized and central station, when central station carries out data processing, corresponding correction is added to the timestamp from corresponding extension station, the time reference realizing all extension stations is all same as on the time reference of central station, completes multistation time synchronized.
Fig. 2 is ADS-B Signal transmissions figure of the present invention.The information such as position, speed of self outwards broadcasted by the aircraft that ADS-B is housed according to some cycles.When certain ADS-B position message simultaneously receive by all receiving stations and stamp each station local time stamp, this ADS-B message can be established at UTC time t 0broadcast away from airborne antenna, 1 (supposing to stand centered by station 1) of standing is at t 1moment receives this message, stands 2 at t 2..., the M that stands is at t mmoment receives this message, and stand 1, stand 2 ..., the time reference of the M that stands and the difference of standard UTC time be respectively Δ T 1, Δ T 2..., Δ T m, the position of aircraft when sending this message can obtain from message, and the position of all receiving stations is known, and when so can obtain message transmission, the distance at aircraft and each station is respectively D 1, D 2..., D m, so can obtain:
t 1 = t 0 + Δ T 1 + D 1 / C t 2 = t 0 + Δ T 2 + D 2 / C · · · t M = t 0 + Δ T M + D M / C - - - ( 1 )
Wherein, only t 0with Δ T 1, Δ T 2..., Δ T mfor unknown number, C is the light velocity.By formula (1) can stand 2 with station 1 (central station) time reference poor, for
ΔT 1-ΔT 2＝t 1-t 2+(D 2-D 1)/C (2)
The time reference that in like manner can obtain other stations and central station is poor, when the timestamp of central station process from each extension station, all adds corresponding correction, namely completes synchronous.
Fig. 3 is time reference of the present invention difference computation model schematic diagram.In fig. 2, only consider multistation stationary problem ideally, in this case, only need extension station to be synchronized and central station jointly to receive adjacent two ADS-B position messages and can realize synchronous.But the position that reality is aircraft to be reported the residing at that time actual location of non-aircraft, mainly contain two factors here: one is the position error of airborne navigational system; Two is there is time delay between location and message send.Here the position error of airborne navigational system accounts for secondary cause, and transmission delay accounts for principal element.Therefore only considering fixing transmission delay, can establish: extension station to be synchronized and central station receive the position message of certain airplane N number of jointly, the position that aircraft is reported is P bN, the actual position of aircraft is P rN, both distances are Δ L; Report position for summit with aircraft, with course line and the line of 1 (central station) of arriving at a station for both sides, its angle is θ bN1, can θ be obtained equally bN2, θ rN1, θ rN2definition; Aircraft is reported position, aircraft actual position and station 1, the distance of standing between 2 and is respectively D bN1, D bN2, D rN1, D rN2.In formula (2), D2, D1 should adopt the distance D between the actual position of aircraft to two stations rN2, D rN1.And the actual position of target cannot be known, that participate in computing is D bN2and D bN1.Because Δ L is hundred meters of magnitudes, and plane distance receiving station is generally ten kilometers, so can think θ bN1=θ rN1, θ bN2=θ rN2, so have
D RN 1 = D BN 1 - ΔL * cos ( θ BN 1 ) D RN 2 = D BN 2 - ΔL * cos ( θ BN 2 ) - - - ( 3 )
Formula (3) is substituted into formula (2) can obtain:
ΔT 1-ΔT 2＝t N1-t N2+(D BN2-D BN1+ΔL*(cos(θ BN1)-cos(θ BN2)))/C (4)
In formula (4), only Δ L is unknown.Consider when this airplane in this course line reverse flew this position (being similar to) time, the minus sign in formula (3) will become plus sige.Two the ADS-B messages reported during by receiving aircraft one and having a try and fly over this position, the value of available two time reference differences, is averaging it and obtains Δ T 1t 2(N), the impact that LL brings can be eliminated, that is to say the synchronous error impact reduced because fixing forward delay interval brings.
For by position error and the error sending random delay introducing, due to its Normal Distribution, can by array [the Δ T of data by calculating to certain batch 1t 2(1), Δ T 1t 2(2) ... Δ T 1t 2(N)] be averaging reduce.
In the present invention, the time synchronized of wide area multistation is not limited to the quantity of extension station to be synchronized, time synchronized can be carried out to any number of stations being greater than two stations in theory with same group of data, but it is larger to require that all stations can receive same ADS-B message difficulty in Practical Project, this is by very limited for the data causing meeting the demands, even cannot obtain, thus cannot multistation time synchronized be carried out.But our extension station group that can several are divided into be synchronized multiple extension station, utilizes multi-group data to carry out synchronous with central station respectively for Duo Zu extension station, finally also can realize the time synchronized of multistation.

Claims (4)

1., based on the wide area multistation method for synchronizing time of ADS-B signal, it is characterized in that utilizing the existing ADS-B signal with aircraft self-position in the air wide area multistation to be carried out to the method for exact time synchronization, be specially:
(1) wide area multistation receives ADS-B signal and stamps local time stamp, and the message stamping local time stamp is sent to central station by original circuit;
(2) select the ADS-B message that extension station to be synchronized and central station all receive, it undertaken in batches by No. ICAO, be chosen at same section of course line have data batch;
(3) according to position message amount, continuity, navigation accuracy grade three parameters, comprehensive assessment is carried out to the lot data selected in (2), carry out prioritization according to assessment result;
(4) the one group of data (comprising the data of at least one batch) met the demands are selected;
(5) by the data of each batch in (4) according to ADS-B Signal transmissions model and the sample of time reference difference between error model computer center station and certain extension station to be synchronized, and the weights of the time reference difference sample that each lot data calculates are set according to the prioritization in (3);
(6) according to the time reference difference in (5) and weights, the time reference estimating this extension station to be synchronized and central station is poor;
(7) obtain the time reference correction to corresponding extension station according to the result in (6), when central station carries out data processing, this correction is all added to the time stab information from corresponding extension station, with unified to central station time reference;
(8) other extension stations are synchronized to central station one by one according to (5) ~ (7) step, complete multistation time synchronized.
2. the wide area multistation method for synchronizing time based on ADS-B signal according to claim 1, is characterized in that: the basic thought that described time reference difference calculates be timestamp that distance and receiving station by obtaining aircraft and receiving station are stamped counter release two stand between time reference poor.
3. error model according to claim 1, is characterized in that: reduce by the data utilizing certain airplane to have a try in certain position one evaluated error caused by fixing transmission delay; The evaluated error caused by position error and random transmission delay is reduced by the multiple data on certain section of course line.
4. the wide area multistation method for synchronizing time based on ADS-B signal according to claim 1, is characterized in that: the present invention does not limit the quantity of extension station to be synchronized, can carry out time synchronized in theory for any number of station.
CN201410576649.8A 2014-10-16 2014-10-16 Wide area multistation method for synchronizing time based on ADS-B signals Withdrawn - After Issue CN104618088B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410576649.8A CN104618088B (en) 2014-10-16 2014-10-16 Wide area multistation method for synchronizing time based on ADS-B signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410576649.8A CN104618088B (en) 2014-10-16 2014-10-16 Wide area multistation method for synchronizing time based on ADS-B signals

Publications (2)

Publication Number Publication Date
CN104618088A true CN104618088A (en) 2015-05-13
CN104618088B CN104618088B (en) 2018-05-08

Family

ID=53152384

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410576649.8A Withdrawn - After Issue CN104618088B (en) 2014-10-16 2014-10-16 Wide area multistation method for synchronizing time based on ADS-B signals

Country Status (1)

Country Link
CN (1) CN104618088B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105227400A (en) * 2015-09-16 2016-01-06 大连理工大学 A kind of for time become the adaptive estimation method of ADS-B message time delay
CN111263294A (en) * 2020-01-08 2020-06-09 北京邮电大学 Time synchronization method and device between equipment nodes based on airplane broadcast signals
CN111585639A (en) * 2020-04-27 2020-08-25 上海航天计算机技术研究所 Monitoring method and device for satellite-borne ADS-B message and storage medium
CN112394372A (en) * 2020-11-06 2021-02-23 四川九洲空管科技有限责任公司 Method and system for evaluating multipoint positioning performance based on ADS-B recorded data

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101917760A (en) * 2010-08-02 2010-12-15 中国科学院国家授时中心 Common view principle-based unilateral time transmission method
CN102830405A (en) * 2012-08-29 2012-12-19 四川九洲空管科技有限责任公司 High-precision synchronous time service method of multi-point positioning system
CN102854515A (en) * 2012-03-31 2013-01-02 航天东方红卫星有限公司 Method for calibrating combination zero value under constellation positioning mode
EP2579062A1 (en) * 2011-10-07 2013-04-10 Thales Spatial augmentation system adapted to improve the accuracy and reliability of data delivered by a satellite navigation system, and associated method
CN103675804A (en) * 2013-11-14 2014-03-26 中国航天科技集团公司第五研究院第五一三研究所 Inter-satellite ranging method based on dual-satellite time synchronization

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101917760A (en) * 2010-08-02 2010-12-15 中国科学院国家授时中心 Common view principle-based unilateral time transmission method
EP2579062A1 (en) * 2011-10-07 2013-04-10 Thales Spatial augmentation system adapted to improve the accuracy and reliability of data delivered by a satellite navigation system, and associated method
CN102854515A (en) * 2012-03-31 2013-01-02 航天东方红卫星有限公司 Method for calibrating combination zero value under constellation positioning mode
CN102830405A (en) * 2012-08-29 2012-12-19 四川九洲空管科技有限责任公司 High-precision synchronous time service method of multi-point positioning system
CN103675804A (en) * 2013-11-14 2014-03-26 中国航天科技集团公司第五研究院第五一三研究所 Inter-satellite ranging method based on dual-satellite time synchronization

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105227400A (en) * 2015-09-16 2016-01-06 大连理工大学 A kind of for time become the adaptive estimation method of ADS-B message time delay
CN105227400B (en) * 2015-09-16 2018-09-04 大连理工大学 A kind of adaptive estimation method for time-varying ADS-B message time delays
CN111263294A (en) * 2020-01-08 2020-06-09 北京邮电大学 Time synchronization method and device between equipment nodes based on airplane broadcast signals
CN111585639A (en) * 2020-04-27 2020-08-25 上海航天计算机技术研究所 Monitoring method and device for satellite-borne ADS-B message and storage medium
CN112394372A (en) * 2020-11-06 2021-02-23 四川九洲空管科技有限责任公司 Method and system for evaluating multipoint positioning performance based on ADS-B recorded data

Also Published As

Publication number Publication date
CN104618088B (en) 2018-05-08

Similar Documents

Publication Publication Date Title
CN104270814B (en) A kind of localization method mixed based on TDOA and ToF and system
US9255804B2 (en) Determination of state vector, timing, and navigation quality metrics from reception of ADS-B transmissions
CN102884440B (en) For Short baseline, the system and method determining airborne aircraft position at low cost
US20150331099A1 (en) System and method for aircraft navigation based on diverse ranging algorithm using ads-b messages and ground transceiver responses
CN103261911B (en) For reference signal sending method and system, the position measurement method utilizing it, Apparatus and system, the method for synchronizing time utilizing it and the device of position finding
CN110099354A (en) A kind of ultra-wideband communications two-dimensional location method of combination TDOA and TOF
CN102483456A (en) Secondary surveillance radar system for air traffic control
CN104618088A (en) ADS-B (Automatic Dependent Surveillance-Broadcast) signal based wide-area multi-station time synchronizing method
CN101384070A (en) Mobile terminal positioning method, device and system
CN101808359A (en) Method and device for positioning terminal in long-term evolution system
CN109541538A (en) The method for realizing distribution ADS-B passive location anti-fraud function based on chance reference source
CN104159291A (en) Passive type TDOA positioning method
CN105991205A (en) Verifiable and adjustable full synchronous communication network, and implementation method thereof
CN201303334Y (en) Satellite synchronization remote time control device based on dual-mode design
CN206524912U (en) Recreation ground high precision wireless alignment system
CN104297739A (en) Method for guiding photoelectric tracking equipment in navigation monitoring
CN109040964A (en) A kind of efficient passive type time-division TDOA localization method for eliminating clock frequency difference
CN109005584A (en) The Wireless clock synchronization scheme of positioning system based on TDOA technology
CN202421491U (en) Multilateral positioning system based on distributed clocks
CN105717784B (en) Electric power time service method
CN110888134B (en) Non-cooperative and cooperative integrated airport scene monitoring system
Niles et al. Wide area multilateration for alternate position, navigation, and timing (APNT)
CN104502923A (en) Airport GNSS (global navigation satellite system) monitoring receiving system signal quality monitoring method
CN102590786A (en) Multilateral positioning system based on distributed clock
CN104181549A (en) Method for positioning aircraft based on 1090ES data chain ground stations

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information

Inventor after: Tang Xiaoming

Inventor after: Zhang Tao

Inventor after: Li Youhua

Inventor after: Li Honggao

Inventor after: Zhu Hongwei

Inventor after: Jin Lin

Inventor before: Tang Xiaoming

Inventor before: Zhang Tao

Inventor before: Jin Lin

Inventor before: Zhu Hongwei

Inventor before: Li Honggao

CB03 Change of inventor or designer information
TA01 Transfer of patent application right

Effective date of registration: 20180408

Address after: 264000 Yantai hi tech Zone space Road No. 101, Shandong

Applicant after: YANTAI SANHANG RADAR SERVICE TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd.

Address before: 264000 space Road, Yantai hi tech Zone, Shandong Province, No. 101

Applicant before: YANTAI SANHANG RADAR SERVICE TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd.

Applicant before: Naval Aeronautical and Astronautical University of PLA

TA01 Transfer of patent application right
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20230728

Address after: 264001 No. 188 Erma Road, Zhifu District, Yantai City, Shandong Province

Patentee after: NAVAL AVIATION UNIVERSITY OF PLA

Address before: No. 101, Hangtian Road, hi tech Zone, Yantai, Shandong 264000

Patentee before: YANTAI SANHANG RADAR SERVICE TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd.

TR01 Transfer of patent right
AV01 Patent right actively abandoned

Granted publication date: 20180508

Effective date of abandoning: 20230803

AV01 Patent right actively abandoned

Granted publication date: 20180508

Effective date of abandoning: 20230803

AV01 Patent right actively abandoned
AV01 Patent right actively abandoned