CN102967386A - Passive wireless temperature measuring method based on double-antenna channel - Google Patents
Passive wireless temperature measuring method based on double-antenna channel Download PDFInfo
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- CN102967386A CN102967386A CN2012103724858A CN201210372485A CN102967386A CN 102967386 A CN102967386 A CN 102967386A CN 2012103724858 A CN2012103724858 A CN 2012103724858A CN 201210372485 A CN201210372485 A CN 201210372485A CN 102967386 A CN102967386 A CN 102967386A
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Abstract
The invention relates to the field of power passive wireless temperature measurement and particularly relates to a passive wireless temperature measuring method based on a double-antenna channel. The passive wireless temperature measuring method is characterized by including: 1) a temperature measuring terminal sends query instructions to passive temperature sensors through two transmitting antennas and sends transmitting signals of different frequency bands aiming at the different temperature sensors; 2) the temperature sensors start oscillation after receiving the transmitting signals, then resonance signals are reflected, and the two transmitting antennas detect and receive the resonance signals; 3) the temperature measuring terminal calculates data returned from the double-antenna channel; 4) antenna channel states are judged according to characteristic values of the double-antenna channel; and 5) after the double-antenna channel states are judged, temperature values are judges and calculated according to the double-antenna channel states. The passive wireless temperature measuring method based on the double-antenna channel can improve space influence and anti-interference capacity and enhances temperature measuring reliability.
Description
Technical field
The present invention relates to electric power passive and wireless thermometric field, particularly a kind of passive and wireless temp measuring method based on the double antenna passage.
Background technology
Along with the development in city and the construction of intelligent grid, the on-line condition monitoring of high voltage electric power equip ment comes into one's own more and more, and high voltage electric power equip ment node temperature on-line monitoring is important indicator wherein.Electric pressure is high when moving in view of power equipment, the power failure Maintenance Difficulty, and insulation safety requires the characteristics such as harsh, and the passive and wireless thermometric becomes the main flow trend of high voltage electric power equip ment thermometric gradually.
The existing solution of passive and wireless temp measuring system is that a temperature measurement terminal scans 6 passive temperature sensors by a transmit antennas, the passive temperature sensor produces resonance according to its physical characteristics, after the resonance frequency of returning is launched antenna reception, by the current temperature value of calculating of temperature measurement terminal.
Because the passive and wireless thermometric is based on the analog signal transmission of passive sensor, the problem that mainly has following two aspects: at first, it is larger that wireless signal is affected by space environment, when having more blocking between emitting antenna and the wireless temperature-measuring sensor, emitting antenna can't detect the resonance signal that wireless temperature-measuring sensor returns accurately; The second, a little less than the wireless signal antijamming capability, when outside noise more during situation, communication quality can descend, and occurs not detecting or indeterminable situation.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, a kind of passive and wireless temp measuring method based on the double antenna passage is provided, can improve simultaneously the weakness of spacial influence and antijamming capability two aspects, so that the thermometric reliability is improved.
For solving above technical matters, technical scheme of the present invention is: a kind of passive and wireless temp measuring method based on the double antenna passage, and its difference is that its step comprises:
1), temperature measurement terminal, sends different frequency range for the different temperatures sensor and transmits passive temperature sensor transmission query statement by two transmit antennas;
2), temperature sensor receives the rear starting of oscillation that transmits, and then reflects resonance signal, two transmit antennas detect and also receive resonance signal;
3), temperature measurement terminal calculates the data that the double antenna passage returns respectively, draws eigenwert: DB_Value=10 * lg (Noise_Value) (1) according to formula (1)
Wherein DB_Value is eigenwert, and Noise_Value is the detected value that antenna channels is returned;
4), the antenna channels state is judged that then this passage is effective if eigenwert is more than or equal to certain certain value according to the eigenwert of double antenna passage, then this passage is invalid if eigenwert is less than this definite value; Can judge according to the eigenwert that step 3) calculates between each state, thereby carry out the state conversion;
5), judge the double antenna channel status after, carry out temperature value according to its state again and judge to calculate.
By above scheme, described definite value is 15Db, according to the eigenwert of double antenna passage the antenna channels state is judged, then this passage is effective if eigenwert is more than or equal to 15Db, and then this passage is invalid if eigenwert is less than 15Db; Can judge according to the eigenwert that step 3) calculates between each state, thereby carry out the state conversion.
By above scheme, the double antenna channel status in the described step 4) is divided into and is one of four states: state I: the A channel measured value is effective, and B channel measurement value is invalid; State I I:A channel measurement value is invalid, and B channel measurement value is effective; State I II:A channel measurement value is effective, and B channel measurement value is effective; State I V:A channel measurement value is invalid, and B channel measurement value is invalid.
By above scheme, carry out temperature value according to the double antenna channel status in the described step 5) and judge that the foundation of calculating is: when state was III, getting two channel datas while accounting temperature value and getting its mean value was current temperature value; When state was I, getting A channel data accounting temperature was current temperature value; When state was II, getting B channel data accounting temperature was current temperature value; When state was IV, current temperature value can't be calculated, and getting certain particular value is current temperature value.
The contrast prior art, beneficial features of the present invention is: the method has reduced the impact that wireless signal is subjected to space environment substantially, and two antennas receive the resonance signal that temperature sensor returns simultaneously, processing through temperature measurement terminal, screen effective resonance signal, thereby the enhancing antijamming capability reaches higher measurement reliability.
Description of drawings
Fig. 1 is temperature measurement terminal treatment scheme synoptic diagram among the present invention;
Fig. 2 is that passage validity is judged synoptic diagram among the present invention;
Fig. 3 is channel status conversion synoptic diagram among the present invention;
Fig. 4 is according to channel status accounting temperature value synoptic diagram among the present invention;
Fig. 5 is that the passive and wireless temp measuring system antenna probes in the embodiment of the invention is disposed synoptic diagram;
Fig. 6 is that existing passive wireless temperature measurement system antenna probes is disposed synoptic diagram.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
Please refer to Fig. 5, generally speaking, principle of the present invention is, dispose two transmit antennas 2 at front end thermometric environment, the space environment that fully weakens is worked by the double antenna passage simultaneously simultaneously on the impact of passive and wireless thermometric, temperature sensor 3 is carried out the resonance frequency that frequency sweep and reception are returned, temperature measurement terminal 1 is according to the data computation of characteristic values of returning, thereby judges the state of two antenna channels, calculates current temperature value by the double antenna channel status.
Take switch cubicle passive and wireless thermometric as example, as shown in Figure 6, original system is installed 6 temperature sensors 3 in the switch cubicle cavity, adopts a transmit antennas 2 that its signal is gathered, and has the dead angle of electromagnetic environment in the space, is not easy to the collection of signal.And the method among employing the present invention is affixed one's name to two transmit antennas in the switch cubicle inside cavity, can make the maximized disappearance in dead angle, space.
Interference source under the electromagnetic environment generally can last very long, all is randomly, and transience ground occurs, and space distribution is inhomogeneous, and the mode that adopts binary channels to work simultaneously cooperates the terminal processes algorithm, as shown in Figure 1, can effectively evade this problem.Detailed process is as follows:
Step S10, temperature measurement terminal sends query statement by two transmit antennas to the passive temperature sensor, sends different frequency range for the different temperatures sensor and transmits.
Step S20, temperature sensor receive the rear starting of oscillation that transmits, and then reflect resonance signal, and two transmit antennas detect and receive resonance signal.
Step S30, temperature measurement terminal calculates the data that the double antenna passage returns respectively, draw eigenwert according to following formula: DB_Value=10 * lg (Noise_Value), wherein DB_Value is eigenwert, Noise_Value is the detected value that antenna channels is returned.
Step S40 judges the antenna channels state according to the eigenwert of double antenna passage.As shown in Figure 2: if eigenwert more than or equal to 15Db, then this passage is effective; If eigenwert is less than 15Db, then this passage is invalid.System is divided into altogether one of four states: state I is that the A channel measurement data is effective, and B channel measurement data are invalid; State I I is that the A channel measurement data is invalid, and B channel measurement data are effective; State I II is that A, B two channel measurement data are all effective; State I V is that A, B two channel measurement data are all invalid.As shown in Figure 3, can judge according to the eigenwert that step S30 calculates between the one of four states, thereby carry out the state conversion.
Step S50, judge the double antenna channel status after, carry out temperature value according to its state again and judge to calculate, as shown in Figure 4, be state I II if state is C210, then get simultaneously accounting temperature value and to get its mean value be current temperature value of two channel datas; If state is C220 is state I, then getting A channel data accounting temperature is current temperature value; If state is C230 is state I I, then getting B channel data accounting temperature is current temperature value; If state is C240 is state I V, then current temperature value can't be calculated, and gets a certain particular value (for example 65535) and is current temperature value.
Above content is the further description of the present invention being done in conjunction with concrete embodiment, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. passive and wireless temp measuring method based on the double antenna passage is characterized in that its step comprises:
1), temperature measurement terminal, sends different frequency range for the different temperatures sensor and transmits passive temperature sensor transmission query statement by two transmit antennas;
2), temperature sensor receives the rear starting of oscillation that transmits, and then reflects resonance signal, two transmit antennas detect and also receive resonance signal;
3), temperature measurement terminal calculates the data that the double antenna passage returns respectively, draws eigenwert: DB_Value=10 * lg (Noise_Value) (1) according to formula (1)
Wherein DB_Value is eigenwert, and Noise_Value is the detected value that antenna channels is returned;
4), the antenna channels state is judged that then this passage is effective if eigenwert is more than or equal to certain certain value according to the eigenwert of double antenna passage, then this passage is invalid if eigenwert is less than this definite value; Can judge according to the eigenwert that step 3) calculates between each state, thereby carry out the state conversion;
5), judge the double antenna channel status after, carry out temperature value according to its state again and judge to calculate.
2. the passive and wireless temp measuring method based on the double antenna passage as claimed in claim 1, it is characterized in that: described definite value is 15Db, eigenwert according to the double antenna passage is judged the antenna channels state, then this passage is effective if eigenwert is more than or equal to 15Db, and then this passage is invalid if eigenwert is less than 15Db; Can judge according to the eigenwert that step 3) calculates between each state, thereby carry out the state conversion.
3. the passive and wireless temp measuring method based on the double antenna passage as claimed in claim 1 or 2, it is characterized in that: the double antenna channel status in the described step 4) is divided into and is one of four states: state I: the A channel measured value is effective, and B channel measurement value is invalid; State I I:A channel measurement value is invalid, and B channel measurement value is effective; State I II:A channel measurement value is effective, and B channel measurement value is effective; State I V:A channel measurement value is invalid, and B channel measurement value is invalid.
4. the passive and wireless temp measuring method based on the double antenna passage as claimed in claim 3, it is characterized in that: carry out temperature value according to the double antenna channel status in the described step 5) and judge that the foundation of calculating is: when state was III, getting two channel datas while accounting temperature value and getting its mean value was current temperature value; When state was I, getting A channel data accounting temperature was current temperature value; When state was II, getting B channel data accounting temperature was current temperature value; When state was IV, current temperature value can't be calculated, and getting certain particular value is current temperature value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987769A (en) * | 2015-01-29 | 2016-10-05 | 国家电网公司 | Data measurement method and device based on surface acoustic wave sensor |
Citations (2)
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| US20040212493A1 (en) * | 2003-02-03 | 2004-10-28 | Stilp Louis A. | RFID reader for a security network |
| CN1990285A (en) * | 2005-12-27 | 2007-07-04 | 上海保隆实业股份有限公司 | Double-antenna signal reception method in tyre gas pressure observation system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040212493A1 (en) * | 2003-02-03 | 2004-10-28 | Stilp Louis A. | RFID reader for a security network |
| CN1990285A (en) * | 2005-12-27 | 2007-07-04 | 上海保隆实业股份有限公司 | Double-antenna signal reception method in tyre gas pressure observation system |
Non-Patent Citations (1)
| Title |
|---|
| WEN LIU,ETC.: "SAW Temperature Sensors System for Smart Electric Grid", 《ULTRASONICS SYMPOSIUM(IUS),2010 IEEE》, 31 December 2010 (2010-12-31), pages 756 - 759 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987769A (en) * | 2015-01-29 | 2016-10-05 | 国家电网公司 | Data measurement method and device based on surface acoustic wave sensor |
| CN105987769B (en) * | 2015-01-29 | 2018-03-16 | 国家电网公司 | A kind of data measuring method and device based on surface acoustic wave sensor |
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