CN205941881U - Low target multiple spot positioning system based on digital broadcast - Google Patents
Low target multiple spot positioning system based on digital broadcast Download PDFInfo
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- CN205941881U CN205941881U CN201620454877.2U CN201620454877U CN205941881U CN 205941881 U CN205941881 U CN 205941881U CN 201620454877 U CN201620454877 U CN 201620454877U CN 205941881 U CN205941881 U CN 205941881U
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Abstract
The utility model discloses a low target multiple spot positioning system based on digital broadcast, including an emitting station, an at least three accepting station and a signal processing's main website. The accepting station comprises antenna, radio frequency front end. The antenna adopts the thin antenna of straightening. The signal utilizes optical fiber link to send into signal processing's main website behind this radio frequency front end's filtering amplification. Signal processing's main website includes sample thief and signal processing machine, and the sample thief is sent the signal into AD and is carried out the band -pass sampling and obtain data signal, and the signal processing machine utilizes the computer to carry out digital signal processing, shows in the computer that object positioning trails the result. The utility model discloses a three or a plurality of accepting stations are utilized to advance multistation location upon delta -T technique, measure the time difference that same signal reachd each accepting station, confirm that a plurality of location curved surface is crossing, obtain the position of target. Utilize the characteristics that differ greatly to come the location and improve positioning accuracy between the different platform positioning curved surfaces, have the advantage fast, that the precision is high.
Description
Technical field
The utility model belongs to external illuminators-based radar field of detecting and in particular to a kind of low target based on digital broadcasting
Multipoint location system.
Background technology
With greatly developing of the aircraft industry such as unmanned plane, bring acid test to the supervision of low altitude airspace.Logical
Primary radar, the limitation of secondary radar location mechanism become obvious all the more, are just urgently needing to propose some new methods
To ensure positioning and the supervision of low target.
External illuminators-based radar, be a kind of using third party's non-cooperation radiation source as detectable signal, scattered from the target receiving
It is emitted back towards extracting distance, the isoparametric equipment of orientation and velocity in ripple, there is low cost, environmental protection, strong antijamming capability etc. all
Many advantages.Recently as digital broadcasting (digital dispatching system DRM, digital audio broadcasting DAB, digital television broadcasting DVB-T
Deng) in global popularization, extensive concern is caused based on the external illuminators-based radar of digital broadcast signal.So, present external radiation
Source radar when detecting to low latitude, by digital broadcast signal as first-selection.
Utility model content
The purpose of this utility model is in view of the shortcomings of the prior art, proposes a kind of low latitude mesh based on digital broadcasting
Mark multipoint location system.
For achieving the above object, the technical solution adopted in the utility model is：
Based on the low target multipoint location system of digital broadcasting, including：One cell site, at least three receiving stations, with
And the main website of signal transacting that is connected by optical fiber with receiving station simultaneously.
Cell site refers in the middle of working environment that the digital broadcast transmitting station of actual operation independently sets up without one's own side, its to
Continual transmitting carrier frequency and signal known to modulation system outward.
In the above-mentioned low target multipoint location system based on digital broadcasting, described receiving station is by antenna, radio-frequency front-end
Composition, each receiving station is distributed in different positions, and each receiving station is separate；Antenna is using carefully straight antenna；Radio-frequency front-end
Including the protector being sequentially connected, low-noise amplifier, frequency mixer, matched filter, variable gain amplifier and fixed gain
Amplifier；Signal, after the amplification of this radio-frequency front-end filters, sends into the main website of signal transacting using optical fiber link.
In the above-mentioned low target multipoint location system based on digital broadcasting, the main website of described signal transacting includes sampling
Device and signal processor, signal feeding AD is carried out bandpass sampling and obtains data signal by sampler, and signal processor is using calculating
Machine carries out Digital Signal Processing, in a computer display target locating and tracking result.
The beneficial effects of the utility model：Using advanced time difference locating technology technology, using three or multiple reception
Stand, measure the time difference that same signal reaches each receiving station, determine multiple positioning surface intersections, obtain the position of target.Profit
Position the feature differing greatly between curved surface to position and improve positioning precision with different platform, there is speed fast, high precision
Advantage.Hardware configuration simple and flexible, mobility strong.
Brief description
Fig. 1 is the low target multipoint location system structural representation based on digital broadcasting described in the utility model.
Fig. 2 is receiver radio frequency front-end view described in the utility model.
Fig. 3 is signal processor schematic diagram described in the utility model.
Specific embodiment
By combination accompanying drawing described further below it will be further appreciated that feature of the present utility model and advantage.There is provided
Embodiment is only the explanation to the utility model method, and limits remaining content of the utility model announcement never in any form.
As shown in figure 1, being the low target multipoint location system structural representation based on digital broadcasting described in the utility model
Figure.Alignment system described in the utility model includes a cell site, the main website of at least three receiving stations and a signal transacting.
Cell site refers in the middle of working environment that the digital broadcast transmitting station of actual operation independently sets up without one's own side, its to
Continual transmitting carrier frequency and signal known to modulation system outward.
Receiving station is made up of antenna, radio-frequency front-end, and each receiving station is distributed in different positions, and each receiving station is mutually only
Vertical.Antenna is using carefully straight antenna.Radio-frequency front-end includes low-noise amplifier, frequency mixer, matched filter, variable gain amplifier
And fixed gain amplifier.Signal, after the amplification of this radio-frequency front-end filters, sends into the master of signal transacting using optical fiber link
Stand.
The main website of signal transacting includes sampler and signal processor, and signal feeding AD is carried out bandpass sampling and obtains by sampler
To data signal, signal processor carries out Digital Signal Processing using computer, in a computer display target locating and tracking knot
Really.
As shown in Fig. 2 being receiver radio frequency front-end view described in the utility model.Protector that it includes, low noise
Amplifier, frequency mixer, matched filter, wave detector and the video amplifier are sequentially connected.
Protector adopts two reverse PN junctions, positioned at radio-frequency front-end original position, is joined directly together with antenna, plays amplitude limit
Big signal protection receiver, improves the effect of dynamic range.
Low-noise amplifier is connected with protector output, for amplifying signal and avoiding additional noise of leading the way, increases
The sensitivity of receiver, noise-reduction coefficient.
Matched filter is connected with amplifier output, is designed as identical with digital broadcasting wave signaling mode, is filtered by coupling
Ripple suppresses noise further.
Variable gain amplifier is connected with matched filtering output, and from AD8370, gain controllable scope is -11dB-34dB.
Final stage fixed gain amplifier selects GALI74, and its gain is 25dB, and 1dB compression point is up to 19.2dBm.
As shown in figure 3, being signal processor schematic diagram described in the utility model.The main website of described signal transacting includes sampling
Device and signal processor.
Sampler utilizes multichannel A/D chip AD7656, carries out bandpass sampling to signal, signal is converted to data signal.
Signal processor adopts computer as host computer, carries out Digital Signal Processing in a computer, obtains in signal
Useful parameter, using time difference locating technology algorithm, obtains target location and shows flight path.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated skill of the utility model
The technical staff in art field can make various modifications or supplement or using similar side to described specific embodiment
Method substitutes, but without departing from spirit of the present utility model or surmounts scope defined in appended claims.
Claims (2)
1. the low target multipoint location system based on digital broadcasting it is characterised in that：Including a cell site, at least three connect
Receive station and the main website of the signal transacting being simultaneously connected by optical fiber with receiving station；
Described receiving station is made up of antenna, radio-frequency front-end, and each receiving station is distributed in different positions, and each receiving station is mutually only
Vertical；Antenna is using carefully straight antenna；Protector that radio-frequency front-end includes being sequentially connected, low-noise amplifier, frequency mixer, matched filtering
Device, variable gain amplifier and fixed gain amplifier；Signal through this radio-frequency front-end amplification filter after, using optical fiber link
Send into the main website of signal transacting.
2. the low target multipoint location system based on digital broadcasting according to claim 1 it is characterised in that：Described letter
Number process main website include sampler and signal processor, sampler by signal feeding AD carry out bandpass sampling obtain numeral letter
Number, signal processor carries out Digital Signal Processing using computer, in a computer display target locating and tracking result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620454877.2U CN205941881U (en) | 2016-05-18 | 2016-05-18 | Low target multiple spot positioning system based on digital broadcast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620454877.2U CN205941881U (en) | 2016-05-18 | 2016-05-18 | Low target multiple spot positioning system based on digital broadcast |
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| Publication Number | Publication Date |
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| CN205941881U true CN205941881U (en) | 2017-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620454877.2U Expired - Fee Related CN205941881U (en) | 2016-05-18 | 2016-05-18 | Low target multiple spot positioning system based on digital broadcast |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445455A (en) * | 2018-04-03 | 2018-08-24 | 芜湖泰贺知信息系统有限公司 | A kind of portable passive Radar Electromagnetic Environment test device |
| CN108519586A (en) * | 2018-04-03 | 2018-09-11 | 芜湖泰贺知信息系统有限公司 | A kind of distribution Passive Radar System and its object localization method |
| CN108562893A (en) * | 2018-04-12 | 2018-09-21 | 武汉大学 | A kind of external illuminators-based radar multistation combined tracking method |
| CN113358931A (en) * | 2021-05-14 | 2021-09-07 | 深圳华创电科技术有限公司 | Time difference calculation method and system based on cross-power spectrum |
-
2016
- 2016-05-18 CN CN201620454877.2U patent/CN205941881U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445455A (en) * | 2018-04-03 | 2018-08-24 | 芜湖泰贺知信息系统有限公司 | A kind of portable passive Radar Electromagnetic Environment test device |
| CN108519586A (en) * | 2018-04-03 | 2018-09-11 | 芜湖泰贺知信息系统有限公司 | A kind of distribution Passive Radar System and its object localization method |
| CN108562893A (en) * | 2018-04-12 | 2018-09-21 | 武汉大学 | A kind of external illuminators-based radar multistation combined tracking method |
| CN108562893B (en) * | 2018-04-12 | 2021-08-17 | 武汉大学 | External radiation source radar multi-station hybrid tracking method |
| CN113358931A (en) * | 2021-05-14 | 2021-09-07 | 深圳华创电科技术有限公司 | Time difference calculation method and system based on cross-power spectrum |
| CN113358931B (en) * | 2021-05-14 | 2022-08-23 | 深圳华创电科技术有限公司 | Time difference calculation method based on cross-power spectrum |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170208 Termination date: 20170518 |
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| CF01 | Termination of patent right due to non-payment of annual fee |