CN201945685U - High-accuracy time difference of arrival (TDOA) measuring system for distribution type pulse signals - Google Patents
High-accuracy time difference of arrival (TDOA) measuring system for distribution type pulse signals Download PDFInfo
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- CN201945685U CN201945685U CN2010205910481U CN201020591048U CN201945685U CN 201945685 U CN201945685 U CN 201945685U CN 2010205910481 U CN2010205910481 U CN 2010205910481U CN 201020591048 U CN201020591048 U CN 201020591048U CN 201945685 U CN201945685 U CN 201945685U
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Abstract
The utility model discloses a high-accuracy TDOA measuring system for distribution type pulse signals, which comprises a time of arrival (TOA) detecting module in a multipoint positioning distant station and a target TOA calculating module in a multipoint positioning processing station. The system makes up the deficiency of measuring by a single way and achieves the purpose of detecting the TDOA of the distribution type pulse signals with high accuracy, thereby reducing the target positioning error and improving the overall performance of the multipoint positioning system.
Description
Technical field
The utility model relates to a kind of civil aviation field multipoint positioning surveillance pulse signal detection system.
Background technology
Need in the civil aviation transport process position of aircraft is monitored in real time, the surveillance equipment that uses in a large number is aviation management one secondary radar at present.The supervision precision of tradition radar can satisfy the requirement that airborne aircraft monitors precision.And for airdrome scene, air traffic control radar monitors that precision can't reach＜7.5 meters requirement, therefore needs to use new surveillance equipment.
Civil aviation multipoint positioning surveillance belongs to the passive location system based on time difference location.A plurality of signal receiving terminals that are distributed in diverse geographic location are arranged in this system.Each time (TOA) of standing of 1090Mhz answer signal arrival that airborne navigation management secondary radar answering machine sends will be measured by each receiving station.Afterwards, center processing subsystem certain answer signal that will calculate particular aircraft arrives the mistiming (TDOA) of each receiving station.Finally, the center processing subsystem will utilize 3 TDOA between above signal receiving terminal, calculate the exact position of aircraft.
The bearing accuracy of multipoint positioning surveillance is reached＜7.5 meters precision, the detection of TDOA need reach the measuring accuracy of nanosecond.The accuracy and the drift characteristic of each receiving station local clock frequency there are differences, and can the accuracy of detection of TDOA be affected greatly, thereby introduce target location error.
In the existing mature technology, the method that can be used for subduing this kind error has three kinds: 1) GPS time service clock: all there is the clock module of a GPS time service at each multiple spot unit signal station, is used to provide the temporal frequency benchmark of single receiving station.GPS time service submodule in the module is by the difference on the frequency of comparison gps clock signal with local clock, constantly revises the frequency of local frequency source by mode such as voltage-controlled.Finally, make the clock signal at each station all be traceable to gps clock, thereby reach the purpose of eliminating clock jitter.
There is following limitation in these class methods: the transmission of gps signal can be subjected to ionosphere and disturb in the troposphere; The gps satellite that signal receiving terminal can trace into is in continuous variation; The frequency drift of receiving station's local clock is very slow.The existence of these factors requires GPS time service module to need could accurately estimate the drift characteristic of clock by the mass data accumulation.In addition, the voltage-controlled adjustment to receiving station's local clock is the slow process of a little stepping.Therefore the output of the clock of GPS time service clock need about 2 hours just can reach stable.And GPS time service clock general cost is higher.
2) use the cable network time of carrying out to transmit and comparison: these class methods use optical fiber to set up wired connection between signal receiving terminal and center processing station, and the comparison and the error correction of a clock signal of standing.
There is following limitation in these class methods: the laying of carrying out wired cable on the airport of having come into operation is comparatively difficult; Use wired cable to carry out clock comparison and require the distance between sites can not be excessive, can't adopt this kind method to carry out clock synchronization the supervision of aerial target on a large scale.
3) centralized TOA detects: signal receiving terminal only carries out signal and receives, and the signal that receives directly is forwarded to the center processing part by optical fiber.Center processing partly uses the single frequency benchmark as clock signal multiple signals to be detected the mark with TOA.In the method, each signal receiving terminal only plays the effect of signal forwarding, need not between each station clock synchronously.
There is following limitation in these class methods: the laying of carrying out wired cable on the airport of having come into operation is comparatively difficult; Use wired cable to carry out clock comparison and require the distance between sites can not be excessive, can't adopt this kind method to carry out clock synchronization the supervision of aerial target on a large scale.
Summary of the invention
Goal of the invention of the present utility model is: at the problem of above-mentioned existence, provide a solution: high precision distributed pulse signal arrival time difference detection system, this system comprises with reference to answering machine, multipoint positioning remote station service part, it is characterized in that: this is the S pattern Radio Beacon that is positioned over the accurate coordinates fixed position with reference to answering machine, periodic transmission 1090MHZMODES signal is one in the system common apparent time Zhong Yuan; Described multipoint positioning remote station service part also comprises: 1) GPS looks each remote station that control assembly: GPS looks the multipoint location system that is meant that participation is looked altogether altogether altogether and respectively establishes a gps time receiver; 2) gps signal receiving-member: the GPS receiver is to carry out the major equipment that GPS looks comparison altogether; 3) frequency reference is provided with parts: the local clock of multipoint location system remote station is the frequency reference of native system, and local clock is high steady double flute constant temperature crystal, and it provides the reference frequency signal of the high stability of 10MHz; 4) clock jitter estimation section; 5) pulse signal detection part; 6) pulse signal TOA measurement component; 7) pulse signal TOA correcting part.It is a subsystem of civil aviation multipoint positioning surveillance that high precision distributed pulse signal time in this patent arrives the difference detection system.This system is made of the target TOA computing module in TOA detection module in the multipoint positioning remote station and the multipoint positioning center processing station, and system architecture as shown in Figure 1.
TOA detection module in the system has the aircraft answer signal TOA time of remote station (signal arrive), with reference to functions such as answering machine signal TOA detection, remote station frequency reference estimation of deviation, signal TOA corrections.Target TDOA computing module in the system has functions such as multistation signal TOA pairing, each remote station droop estimation, the calculating of TDOA initial value, TDOA correction.Each multipoint positioning remote station in the multipoint location system all has a TOA detection module, and target TDOA computing module is included in the multipoint positioning center processing station.
The TOA measurement module is replied in target and reference: target and reference are replied the TOA measurement and are mainly finished at the multipoint positioning remote station.Major function is to detect target and with reference to the transponder pulse signal, after successfully detecting the framework pulse, obtain target and with reference to the code element of answer signal, and pulse signals is carried out the TOA mark.Utilize each remote station to work in GPS and look state altogether, revise the clock jitter of each remote station.Thereby carrying out pulse signal TOA revises.With target with deliver to the multipoint positioning central processing unit with reference to answer signal TOA and code element and be for further processing.
With reference to answering machine is the S pattern Radio Beacon that is positioned over the accurate coordinates fixed position, and periodic transmission 1090MHZ MODES signal is a special objective in the system, also can regard it as another one apparent time Zhong Yuan altogether.Because the signal emission cycle with reference to answering machine can be regulated, and therefore can utilize it that local clock accuracy in each second is proofreaied and correct.
Details are as follows for multipoint positioning remote station principle of work and function: 1.GPS looks each remote station that control: GPS looks the multipoint location system that is meant that participation is looked altogether altogether altogether and respectively establishes a gps time receiver, and observe same satellite at one time, realize the time synchronized between each station.
Native system takes GPS to look each multipoint positioning remote station clock jitter of technology correction altogether.In real system work, measure the three-dimensional position of each remote station GPS receiver accurately by modes such as difference location, adopt the control algolithm of design, make each remote station choose same elevation angle big look satellite altogether, make the GPS operation of receiver in the position hold mode, realize the time synchronized between each station.
2.GPS signal receives: the GPS receiver is to carry out the major equipment that GPS looks comparison altogether.The receiver antenna receiving satellite signal, the OEM plate carries out demodulation, processing and measurement to the satellite-signal that receives, get access to data such as ephemeris, pseudorange observed reading, atomic clock parameter, the pps pulse per second signal of satellite system time is represented in output, and the pps pulse per second signal of this signal and local clock is compared.
3. frequency reference: the local clock of multipoint location system remote station is the frequency reference of native system, provides high precision stable frequency reference for target and with reference to replying TOA measurements on the one hand, on the other hand as the input of clock jitter estimation.
Local clock is high steady double flute constant temperature crystal, and it provides the reference frequency signal of the high stability of 10MHz.The degree of stability of crystal is subjected to Temperature Influence bigger, the double flute constant temperature crystal carries out differential amplification with the pairing voltage of Current Temperatures and its nominal value by the thermal control amplifier, driving heater element afterwards makes the interior crystal temperature effect of groove always remain on its high temperature flex point, thereby eliminated the interference of temperature, guaranteed the degree of stability of crystal crystal.Local clock is output as the high stability square wave of 10MHz.
4. clock jitter is estimated: satellite-signal is transferred to the GPS receiver of different websites through different paths, the gps clock information part random noise that superposeed.Therefore adopt filtering and track algorithm estimating clock deviation.Adopt the clock correction estimated value of historical juncture and the clock correction observed reading of current time, estimate the clock correction estimated value of the gps clock and the remote station clock of current time.The later observed reading of current time can not produce any influence to the estimated value of current time, thereby is suitable for real-time clock jitter estimation processing.Native system can enter at each remote station and look altogether under the state, just can reach stable in 20 seconds and estimate.
5. pulse signal detects: receiver at first carries out amplitude limit to the 1090Mhz high-frequency signal that receives from antenna, to prevent the infringement of big input signal to subsequent conditioning circuit.Carrying out the two poles of the earth bandpass filtering and the two poles of the earth signal afterwards amplifies.Through after a series of processing, signal is sent to frequency mixer, carries out down-converted, and signal frequency is reduced to intermediate frequency (IF), by intermediate frequency amplifier intermediate-freuqncy signal is held and amplifies and matched filtering, to obtain maximum output signal-to-noise ratio.Amplify through detection and video at last, intermediate-freuqncy signal is demodulated into vision signal.Video pulse signal will be provided for digital signal processing and partly do subsequent treatment.
6. pulse signal TOA measures: remote station carries out the AD conversion to analog video earlier, then the data of gathering is carried out buffer memory, and the horizontal pulse of going forward side by side detects, and carries out framework again on this basis and detects.
In order to reach high-precision TOA measurement, system adopts adaptive matched filter to obtain pulse delay, then the signal extraction that keeps intermediate frequency carrier is gone out medium-frequency pulse, and adopts the phase difference method of DTFT to carry out high-precision TOA measurement.
7. pulse signal TOA revises: on the basis of clock jitter estimation and pulse signal TOA measured value, pulse signals TOA revises in real time.
In sum, owing to adopted technique scheme, the beneficial effects of the utility model are: native system adopts GPS to look technology altogether and proofreaies and correct the method for combination with reference to the answering machine synchronous error, so that system time synchronizing signal treatment channel and the time delay error of echo signal treatment channel are proofreaied and correct simultaneously, and used multiple filtering and track algorithm, TOA measuring error and TDOA measuring error are revised in real time.Remedied the deficiency of single mode.Realized that high-precision distributed pulse signal arrival time difference detects, thereby reduced target location error, improved the overall performance of multipoint location system.
1. native system and GPS method for synchronous ratio, the clock output of GPS time service clock need about 2 hours just can reach stable.System's use cost far below the high steady double flute constant temperature crystal of atomic clock as frequency reference; Each remote station enters looks state after 20 seconds altogether, and clocking error is estimated just to reach stable.
2. native system is a distributed system, and it is mutual to need not to carry out signal between the remote station, and central station receives only the TOA data that remote station is sent.And intrasystem signal communication time delay can not impact the TDOA precision.
3. native system adopts GPS to treat as step and the method that combines with reference to answering machine altogether, and the frequency departure and the signal Processing fixed delay error of the clock of multipoint positioning remote station system have been carried out effective correction.The TDOA measuring accuracy can reach the nanosecond rank, and calculating for the multipoint positioning target location provides accuracy guarantee.
Description of drawings
The utility model will illustrate that wherein: Fig. 1 is that high precision distributed pulse signal time arrives difference detection system structural representation by example and with reference to the mode of accompanying drawing.
Fig. 2 TOA detection module synoptic diagram; Fig. 3 is a target TDOA computing module synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The TOA measurement module is replied in target and reference: target and reference are replied the TOA measurement and are mainly finished at the multipoint positioning remote station.Major function is to detect target and with reference to the transponder pulse signal, after successfully detecting the framework pulse, obtain target and with reference to the code element of answer signal, and pulse signals is carried out the TOA mark.Utilize each remote station to work in GPS and look state altogether, revise the clock jitter of each remote station.Thereby carrying out pulse signal TOA revises.With target with deliver to the multipoint positioning central processing unit with reference to answer signal TOA and code element and be for further processing.
With reference to answering machine is the S pattern Radio Beacon that is positioned over the accurate coordinates fixed position, and periodic transmission 1090MHZ MODES signal is a special objective in the system, also can regard it as another one apparent time Zhong Yuan altogether.Because the signal emission cycle with reference to answering machine can be regulated, and therefore can utilize it that local clock accuracy in each second is proofreaied and correct.
Target TDOA revises: to finishing the echo signal after TDOA matches, on the basis of website TDOA estimation of error, carry out target TDOA and revise.
Wherein, be the theoretical value of echo signal to the mistiming between website.The value of actual measurement includes the website synchronous error, by obtaining with reference to replying the TDOA estimation of error.From the value of actual measurement, eliminate synchronous error, the target TDOA after obtaining proofreading and correct.
Thereby realize correction to synchronous error between website.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (1)
1. high precision distributed pulse signal arrival time difference detection system, this system comprises with reference to answering machine, multipoint positioning remote station service part, it is characterized in that: this is the S pattern Radio Beacon that is positioned over the accurate coordinates fixed position with reference to answering machine, periodic transmission 1090MHZ MODE S signal is one in the system common apparent time Zhong Yuan; Described multipoint positioning remote station service part also comprises:
1) GPS looks each remote station that control assembly: GPS looks the multipoint location system that is meant that participation is looked altogether altogether altogether and respectively establishes a gps time receiver;
2) gps signal receiving-member: the GPS receiver is to carry out the major equipment that GPS looks comparison altogether;
3) frequency reference is provided with parts: the local clock of multipoint location system remote station is the frequency reference of native system, and local clock is high steady double flute constant temperature crystal, and it provides the reference frequency signal of the high stability of 10MHz;
4) clock jitter estimation section;
5) pulse signal detection part;
6) pulse signal TOA measurement component;
7) pulse signal TOA correcting part.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590786A (en) * | 2012-02-03 | 2012-07-18 | 中国电子科技集团公司第三十八研究所 | Multilateral positioning system based on distributed clock |
| CN106842118A (en) * | 2016-12-23 | 2017-06-13 | 安徽四创电子股份有限公司 | For the time difference positioning method of Distributed Multi positioning monitoring system |
| CN108535686A (en) * | 2018-03-06 | 2018-09-14 | 中国船舶重工集团公司第七二四研究所 | A kind of time difference positioning method blocking wideband correlation |
| CN112444807A (en) * | 2021-01-29 | 2021-03-05 | 成都能通科技有限公司 | Multi-target anti-interference positioning method based on secondary radar arrival time |
-
2010
- 2010-11-04 CN CN2010205910481U patent/CN201945685U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590786A (en) * | 2012-02-03 | 2012-07-18 | 中国电子科技集团公司第三十八研究所 | Multilateral positioning system based on distributed clock |
| CN106842118A (en) * | 2016-12-23 | 2017-06-13 | 安徽四创电子股份有限公司 | For the time difference positioning method of Distributed Multi positioning monitoring system |
| CN108535686A (en) * | 2018-03-06 | 2018-09-14 | 中国船舶重工集团公司第七二四研究所 | A kind of time difference positioning method blocking wideband correlation |
| CN108535686B (en) * | 2018-03-06 | 2022-02-15 | 中国船舶重工集团公司第七二四研究所 | Time difference positioning method for cutting off broadband linear frequency modulation signal |
| CN112444807A (en) * | 2021-01-29 | 2021-03-05 | 成都能通科技有限公司 | Multi-target anti-interference positioning method based on secondary radar arrival time |
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