CN102967386B - A kind of passive and wireless temp measuring method based on double antenna passage - Google Patents
A kind of passive and wireless temp measuring method based on double antenna passage Download PDFInfo
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- CN102967386B CN102967386B CN201210372485.8A CN201210372485A CN102967386B CN 102967386 B CN102967386 B CN 102967386B CN 201210372485 A CN201210372485 A CN 201210372485A CN 102967386 B CN102967386 B CN 102967386B
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Abstract
The present invention relates to electric power passive and wireless field of temperature measurement, in particular to a kind of passive and wireless temp measuring method based on double antenna passage, its difference is: its step comprises: 1), temperature measurement terminal by two transmit antennas to passive temperature sensor send query statement, for different temperatures sensor send different frequency range transmit; 2), temperature sensor receive and transmit after starting of oscillation, then reflect resonance signal, two transmit antennas detect and receive resonance signal; 3), temperature measurement terminal calculates the data that double antenna passage returns respectively; 4), according to the eigenwert of double antenna passage, antenna channels state is judged; 5), judge double antenna channel status after, then according to its state carry out temperature value judge calculate.The present invention can improve the weakness of spacial influence and antijamming capability two aspect simultaneously, and thermometric reliability is improved.
Description
Technical field
The present invention relates to electric power passive and wireless field of temperature measurement, particularly a kind of passive and wireless temp measuring method based on 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 a wherein important indicator.In view of when power equipment runs, electric pressure is high, power failure Maintenance Difficulty, and insulation safety requires the characteristics such as harsh, and passive and wireless thermometric becomes the main 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 is scanned 6 passive temperature sensors by a transmit antennas, passive temperature sensor produces resonance according to its physical characteristics, the resonance frequency returned is launched after antenna receives, and calculates current temperature value by temperature measurement terminal.
Because passive and wireless thermometric is based on the analog signal transmission of passive sensor, the problem of following two aspects of main existence: first, wireless signal affects larger by space environment, when there is more blocking between emitting antenna and wireless temperature-measuring sensor, emitting antenna cannot detect the resonance signal that wireless temperature-measuring sensor returns accurately; The second, wireless signal antijamming capability is weak, when outside noise more situation time, communication quality can decline, and occurs not detecting or indeterminable situation.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of passive and wireless temp measuring method based on double antenna passage is provided, the weakness of spacial influence and antijamming capability two aspect can be improved simultaneously, 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 double antenna passage, and its difference is, its step comprises:
1), temperature measurement terminal to passive temperature sensor transmission query statement by two transmit antennas, is sent different frequency range for different temperatures sensor and transmits;
2), temperature sensor receive and transmit after starting of oscillation, then reflect resonance signal, two transmit antennas detect and receive resonance signal;
3), temperature measurement terminal calculates the data that 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 returns;
4), according to the eigenwert of double antenna passage judge antenna channels state, if eigenwert is more than or equal to certain certain value, this passage is effective, if eigenwert is less than this definite value, this passage is invalid; The eigenwert that can calculate according to step 3) between each state judges, thus carries out State Transferring;
5), judge double antenna channel status after, then according to its state carry out temperature value judge calculate.
By above scheme, described definite value is 15Db, and the eigenwert according to double antenna passage judges antenna channels state, if eigenwert is more than or equal to 15Db, this passage is effective, if eigenwert is less than 15Db, this passage is invalid; The eigenwert that can calculate according to step 3) between each state judges, thus carries out State Transferring.
By above scheme, the double antenna channel status in described step 4) is divided into one of four states: state I: A channel measured value is effective, and channel B measured value is invalid; State I I:A lane measurement is invalid, and channel B measured value is effective; State I II:A lane measurement is effective, and channel B measured value is effective; State I V:A lane measurement is invalid, and channel B measured value is invalid.
By above scheme, in described step 5) according to double antenna channel status carry out that temperature value judges to calculate according to being: when state is III, get two channel datas accounting temperature value to get its mean value be current temperature value simultaneously; When state is I, getting A channel data accounting temperature is current temperature value; When state is II, getting channel B data accounting temperature is current temperature value; When state is IV, current temperature value cannot calculate, and getting certain particular value is current temperature value.
Contrast prior art, beneficial features of the present invention is: the method decreases the impact of wireless signal by space environment substantially, and two antennas receive the resonance signal that temperature sensor returns simultaneously, through the process of temperature measurement terminal, screen effective resonance signal, thus enhancing antijamming capability, reach higher Measurement reliability.
Accompanying drawing explanation
Fig. 1 is temperature measurement terminal treatment scheme schematic diagram in the present invention;
Fig. 2 is that in the present invention, path validity judges schematic diagram;
Fig. 3 is channel status transition diagram in the present invention;
Fig. 4 is according to channel status accounting temperature value schematic diagram in the present invention;
Fig. 5 is that the passive and wireless temp measuring system antenna probes in the embodiment of the present invention disposes schematic diagram;
Fig. 6 is that existing passive wireless temperature measurement system antenna probes disposes schematic 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, fully weaken space environment to the impact of passive and wireless thermometric, worked by double antenna passage simultaneously simultaneously, the resonance frequency that frequency sweep and reception return is carried out to temperature sensor 3, temperature measurement terminal 1 calculates eigenwert according to the data returned, thus judges the state of two antenna channels, calculates current temperature value by double antenna channel status.
For switch cubicle passive and wireless thermometric, as shown in Figure 6, original system installs 6 temperature sensors 3 in switch cubicle cavity, adopts a transmit antennas 2 to gather its signal, there is the dead angle of electromagnetic environment, be not easy to the collection of signal in space.And adopt the method in the present invention, affix one's name to two transmit antennas in switch cubicle inside cavity, the maximized disappearance in dead angle, space can be made.
Interference source under electromagnetic environment, generally can not last very long, is all randomly, and transience ground occurs, and space distribution is uneven, adopts the mode that binary channels works simultaneously, coordinates 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 passive temperature sensor, sends different frequency range transmit for different temperatures sensor.
Step S20, starting of oscillation after temperature sensor receives and transmits, then reflects resonance signal, and two transmit antennas detect and receive resonance signal.
Step S30, temperature measurement terminal calculates the data that double antenna passage returns respectively, draw eigenwert according to following formula: DB_Value=10 × lg (Noise_Value), wherein DB_Value is eigenwert, and Noise_Value is the detected value that antenna channels returns.
Step S40, the eigenwert according to double antenna passage judges antenna channels state.As shown in Figure 2: if eigenwert is more than or equal to 15Db, then this passage is effective; If eigenwert is less than 15Db, then this passage is invalid.System one is divided into one of four states: state I is that A channel measurement data is effective, and channel B measurement data is invalid; State I I is that A channel measurement data is invalid, and channel B measurement data is 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, the eigenwert that can calculate according to step S30 between one of four states judges, thus carries out State Transferring.
Step S50, after judging double antenna channel status, then carries out temperature value according to its state and judges to calculate, and as shown in Figure 4, if state is C210 and state I II, then gets two channel datas simultaneously accounting temperature value to get its mean value be current temperature value; If state is C220 and state I, then getting A channel data accounting temperature is current temperature value; If state is C230 and state I I, then getting channel B data accounting temperature is current temperature value; If state is C240 and state I V, then current temperature value cannot calculate, and getting a certain particular value (such as 65535) is current temperature value.
Above content is in conjunction with concrete embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (2)
1. based on a passive and wireless temp measuring method for double antenna passage, it is characterized in that, its step comprises:
Step 1), temperature measurement terminal send query statement by two transmit antennas to passive temperature sensor, send different frequency range transmit for different temperatures sensor;
Step 2), temperature sensor receive and transmit after starting of oscillation, then reflect resonance signal, two transmit antennas detect and receive resonance signal;
Step 3), temperature measurement terminal calculates the data that 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 returns;
Step 4), judge antenna channels state according to the eigenwert of double antenna passage, if eigenwert is more than or equal to certain certain value, this passage is effective, if eigenwert is less than this definite value, this passage is invalid; The eigenwert that can calculate according to step 3) between each state judges, thus carries out State Transferring; Double antenna channel status in described step 4) is divided into one of four states: state I: A channel measured value is effective, and B lane measurement is invalid; State I I:A lane measurement is invalid, and B lane measurement is effective; State I II:A lane measurement is effective, and B lane measurement is effective; State I V:A lane measurement is invalid, and B lane measurement is invalid;
Step 5), judge double antenna channel status after, then according to its state carry out temperature value judge calculate;
Described definite value is 15Db, and the eigenwert according to double antenna passage judges antenna channels state, if eigenwert is more than or equal to 15Db, this passage is effective, if eigenwert is less than 15Db, this passage is invalid; The eigenwert that can calculate according to step 3) between each state judges, thus carries out State Transferring.
2. the passive and wireless temp measuring method based on double antenna passage as described in claim 1, it is characterized in that: in described step 5) according to double antenna channel status carry out that temperature value judges to calculate according to being: when state is III, get two channel datas accounting temperature value to get its mean value be current temperature value simultaneously; When state is I, getting A channel data accounting temperature is current temperature value; When state is II, getting B channel data accounting temperature is current temperature value; When state is IV, current temperature value cannot calculate, and getting certain particular value is current temperature value.
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| CN201210372485.8A CN102967386B (en) | 2012-09-29 | 2012-09-29 | A kind of passive and wireless temp measuring method based on double antenna passage |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| US7023341B2 (en) * | 2003-02-03 | 2006-04-04 | Ingrid, Inc. | RFID reader for a security network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| SAW Temperature Sensors System for Smart Electric Grid;Wen Liu,etc.;《Ultrasonics Symposium(IUS),2010 IEEE》;20101231;第756-759页 * |
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