CN203482403U - Chirp spread-spectrum ultra-wideband signal based real-time positioning system - Google Patents
Chirp spread-spectrum ultra-wideband signal based real-time positioning system Download PDFInfo
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- CN203482403U CN203482403U CN201320587443.6U CN201320587443U CN203482403U CN 203482403 U CN203482403 U CN 203482403U CN 201320587443 U CN201320587443 U CN 201320587443U CN 203482403 U CN203482403 U CN 203482403U
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Abstract
The utility model discloses a Chirp spread-spectrum ultra-wideband signal based real-time positioning system which comprises a master control center. The master control center is in cable communication with a receiving terminal which is connected to a mobile terminal. The master control center comprises a time service module and a microprocessor. The time service module sends unified clock to the receiving terminal. The microprocessor calculates arrival time information of the mobile terminal to obtain positional information of the mobile terminal. In comparison with an original RSSI real-time positioning system, the system provided by the utility model has advantages of high measurement accuracy, wide measurement range, excellent adaptation protocol and strong anti-interference performance.
Description
Technical field
The utility model relates to a kind of real-time positioning system, relates in particular to a kind of real-time positioning system based on Chirp spread-spectrum ultra-wideband signal.
Background technology
Chirp signal time bandwidth product is larger, and upper up-conversion signal and lower frequency reducing signal are mutually orthogonal, in fields such as radar fix, radio communications, are used widely.
In actual signal modulated process, general using SAW device (Surface Acoustic Wave Filter), triggers out the CSS signal with pulse characteristic by driving pulse, these signals transmit in channel, and after receiving end receives, device is processed after filtering, obtains pulse compression.Noise composition in the pulse compression signal detecting due to receiving terminal, during despreading, in time domain, by matched filter broadening, weakened or filter, so just equal that broad-band interference is transformed into arrowband and disturb, and because useful pulse amplitude is very large, be easy to be detected pulse.Because receiving terminal can use pulse compression technique Direct Acquisition high-energy, high amplitude pulse, and anti-frequency shift (FS) characteristic is better, in actual communication process, can not need Frequency Synchronization or time synchronized; This detection time is characteristic accurately, for accurate range measurement provides assurance.In range finding and navigation system, receiver always can accurately and fast detect the time that pulse arrives.
Localization method is all RSSI method substantially at present, is all also that RSSI method can produce due to the variation of space environment structure larger error; When RSSI method positions, be very easily subject to external interference.
Utility model content
The purpose of this utility model is exactly in order to address the above problem, and a kind of real-time positioning system based on Chirp spread-spectrum ultra-wideband signal is provided, and it has advantages of measuring range and the positioning precision of effective raising real-time positioning system.
To achieve these goals, the utility model adopts following technical scheme:
A real-time positioning system based on Chirp spread-spectrum ultra-wideband signal, it comprises Master Control Center, and Master Control Center and receiving terminal are by cable communication, and receiving terminal is connected with mobile terminal; Described Master Control Center comprises time service module and microprocessor, and time service module sends unified clock to receiving terminal, and microprocessor resolves the mobile terminal information time of advent, draws the positional information of mobile terminal;
Described mobile terminal comprises Chirp spread-spectrum signal generation module, and Chirp spread-spectrum signal generation module is connected with control module, and control module is connected with Direct Digital Frequency Synthesizers, and described Direct Digital Frequency Synthesizers is connected with frequency mixer;
Described receiving terminal comprises radio-frequency module and clock module, and radio-frequency module is also connected with demodulation module; Described clock module is also connected with demodulation module.
Described receiving terminal is also connected with supply module, and supply module is for the power supply to receiving terminal.
Described radio-frequency module comprises signal filtering module and signal amplification module.
Described demodulation module comprises matched filtering module and signal extraction module.
The beneficial effects of the utility model:
(1) certainty of measurement is high; RSSI method can produce due to the variation of space environment structure larger error; And CSS is for measuring the time of advent that receives signal, than RSSI, be subject to space environment structure influence relatively little.
(2) measuring range is wide; CSS system, after adopting power amplifier and suitable antenna, can reach km level scope; And RSSI mode is generally hundred meter levels, and need through complicated straightened up in place, flexibility is poor.
(3) adapting protocol is excellent; CSS is more suitable for wireless location, and RSSI protocol stack is applicable to the industrial communication of small data quantity.
(4) strong interference immunity; CSS solution timing can obtain compared with high processing gain and effectively improve signal to noise ratio.
Accompanying drawing explanation
Fig. 1 is system block diagram of the present utility model;
Fig. 2 is the system block diagram of mobile terminal of the present utility model;
Fig. 3 is the system block diagram of the utility model receiving terminal.
Wherein, 1. Master Control Center, 2. receiving terminal, 3. mobile terminal, 4. radio-frequency module, 5. demodulation module, 6. clock module, 7. signal filtering module, 8. signal amplification module, 9. matched filtering module, 10. extraction module, 11. control modules, 12. Direct Digital Frequency Synthesizers, 13. frequency mixers, 14.CSS modulation module, 15.Chirp spread-spectrum signal generation module.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
A real-time positioning system based on Chirp spread-spectrum ultra-wideband signal, it comprises Master Control Center 1, Master Control Center 1 passes through cable communication, the Chirp signal that receiving terminal 2 mobile terminal receives 3 are uploaded with receiving terminal 2; Described Master Control Center 1 comprises time service module and microprocessor, and time service module sends unified clock to receiving terminal 2, and microprocessor resolves mobile terminal information 3 time of advent, draws the positional information of mobile terminal 3;
Described mobile terminal 3 comprises Chirp spread-spectrum signal generation module 15, Chirp spread-spectrum signal generation module 15 is connected with control module 11, control module 11 is connected with Direct Digital Frequency Synthesizers 12, control module 11 is controlled Direct Digital Frequency Synthesizers 12 Chirp spread-spectrum signal is become to low-frequency range Chirp signal, and to send into frequency mixer 13 be radio frequency band by its frequency conversion, and send into CSS modulation module 14 and process, then the Chirp signal after processing is sent into receiving terminal 2;
Described receiving terminal 2 comprises radio-frequency module 4 and clock module 6, and radio-frequency module 4 is also connected with demodulation module 5; Radio-frequency module 4 carries out filtering and amplification by the Chirp signal receiving from mobile terminal 3, then send into demodulation module 5, demodulation module 5 completes matched filtering to received signal and the extraction of data demodulates and due in, to draw the information of id information and the due in of mobile terminal 3, and this information is sent into Master Control Center 1; Described clock module 6 is also connected with demodulation module 5, the clock that clock module 6 sends for receiving the time service module of Master Control Center 1, and carry out to received signal clock demarcation.
Described receiving terminal 2 is also connected with supply module, and supply module is for the power supply to receiving terminal 2.
Described radio-frequency module 4 comprises signal filtering module 7 and signal amplification module 8.
Described demodulation module 5 comprises matched filtering module 9 and extraction module 10.
Although above-mentioned, by reference to the accompanying drawings embodiment of the present utility model is described; but the not restriction to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (4)
1. the real-time positioning system based on Chirp spread-spectrum ultra-wideband signal, is characterized in that, it comprises Master Control Center, and Master Control Center and receiving terminal are by cable communication, and receiving terminal is connected with mobile terminal; Described Master Control Center comprises time service module and microprocessor, and time service module sends unified clock to receiving terminal, and microprocessor resolves the mobile terminal information time of advent, draws the positional information of mobile terminal;
Described mobile terminal comprises Chirp spread-spectrum signal generation module, and Chirp spread-spectrum signal generation module is connected with control module, and control module is connected with Direct Digital Frequency Synthesizers, and described Direct Digital Frequency Synthesizers is connected with frequency mixer;
Described receiving terminal comprises radio-frequency module and clock module, and radio-frequency module is also connected with demodulation module; Described clock module is also connected with demodulation module.
2. a kind of real-time positioning system based on Chirp spread-spectrum ultra-wideband signal as claimed in claim 1, is characterized in that, described receiving terminal is also connected with supply module, and supply module is for the power supply to receiving terminal.
3. a kind of real-time positioning system based on Chirp spread-spectrum ultra-wideband signal as claimed in claim 1, is characterized in that, described radio-frequency module comprises signal filtering module and signal amplification module.
4. a kind of real-time positioning system based on Chirp spread-spectrum ultra-wideband signal as claimed in claim 1, is characterized in that, described demodulation module comprises matched filtering module and signal extraction module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320587443.6U CN203482403U (en) | 2013-09-22 | 2013-09-22 | Chirp spread-spectrum ultra-wideband signal based real-time positioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320587443.6U CN203482403U (en) | 2013-09-22 | 2013-09-22 | Chirp spread-spectrum ultra-wideband signal based real-time positioning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203482403U true CN203482403U (en) | 2014-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320587443.6U Expired - Fee Related CN203482403U (en) | 2013-09-22 | 2013-09-22 | Chirp spread-spectrum ultra-wideband signal based real-time positioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203482403U (en) |
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2013
- 2013-09-22 CN CN201320587443.6U patent/CN203482403U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20210922 |
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| CF01 | Termination of patent right due to non-payment of annual fee |