CN101287993B - Lightning detection - Google Patents
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- CN101287993B CN101287993B CN200580051826XA CN200580051826A CN101287993B CN 101287993 B CN101287993 B CN 101287993B CN 200580051826X A CN200580051826X A CN 200580051826XA CN 200580051826 A CN200580051826 A CN 200580051826A CN 101287993 B CN101287993 B CN 101287993B
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Abstract
A lightning detector for lightning detection and a lightning detection method, wherein the mobile lightning detector is provided with an antenna, an amplifier front-end, an A/D converter and a digital signal processor, and wherein the lightning detector is a mobile RF device provided with an audio codec whereby the preamplifier of the codec is used for amplification of the detected lightning signal, the A/D converter of the codec is used for the A/D conversion of the amplified lightning signal, and whereby the digital audio processing unit of the codec is used for the signal processing of the lightning detection.
Description
Technical field
The present invention relates to the lightning detection device.The present invention is specifically related to mobile lightning detection device, and this moves the lightning detection device and is equipped with antenna, amplifier front end, A/D converter and digital signal processor.The invention still further relates to the method that is used to survey lightning.
Background technology
Thunderstorm is main weather harm, but is difficult to prediction.They can be propagated to the speed of 40km/h with 20km/h, and are struck by lightning and can take place greater than the 10km place before nimbus, and also can the same distance after nimbus take place.Though thunderbolt has been caused on cloud or meteorological sharp side, when not having visible thunderstorm warning cloud before in fact the most dangerous a lot of thunderbolts occur in and occur.Therefore, although system only sends warning for its possibility before visible about ten minutes at harmful thunderstorm, can think that this is main security feature.
A lot of people will benefit from such security feature.For some people, it may only provide wishes the knowledge known every day.Yet for a considerable amount of people, the threat that is derived from storm and lightning shows as following form significantly: the risk of increase, property loss or or even fatal result.The lightning warning system for example has special importance for frequent out of doors people, and so same for pilot, navigator etc.The system of lightning warning is provided even when weather seems very tranquil and fine, also makes the people can in time take suitable safety practice, for example seek cover etc.
According to the prior art state, known a lot of single goal lightning detection devices, but they have some shortcoming aspect commercial.
Very big and their scope of the science lightning detection device that uses in the meteorology is a several hundred kilometers.
And other high-end lightning detection devices that use single radio frequency (RF) frequency band are very big and relatively costly than mobile phone for example.And they need have the orientation of appointment usually, for example place on the wall or table on, thereby obtain required accuracy or directivity.Therefore, they can not be fit to actual mobile use well.These equipment must further vertically be located usually, and thunderstorm is carried out reliable detection become may before keep several minutes stable.
In addition, also have now not too expensive low side lightning detection device, its be easy to carry fully in size and do not need to specify towards.Yet these detectors very easily are subjected to the influence of Electromagnetic Compatibility radiation, and cause false alarm in therefore probably near city scene or highway etc.
Summary of the invention
The present invention is derived from following consideration: promptly thunderbolt is a single flash operation, and except the pressure signal that optical signal and part can be listened, this flash of light also generates the of short duration but strong electromagnetic pulse that is extended to the multi-wavelength.The typical electromagnetic pulse that is caused by thunderbolt covers the frequency between 10Hz and the 5GHz, and it has peak value at about 500Hz place, promptly is arranged in audio frequency range.On the normalization of 10km distance, this type of pulse height in the bandwidth of 1kHz scope from 107mV/m to 1mV/m.The peak signal of electromagnetic pulse is the induction field that causes of vertical current in the thunderbolt, and this is to be used for surveying the prevailing parameter that the main equipment of lightning azimuth-range is measured.
Yet, because the complicacy of thunder-strike phenomenon, in hundreds of Hz or lower extremely low frequency (ELF) scope, also have strong signal, and extend to the GHz scope and abovely also exist than weak signal.
Well known fact is that the definite feature of electromagnetic interference (EMI) characteristic and time range have the different of kHz and Hz scope in the MHz scope, because slight different meteorology mechanism has caused their difference.
Yet for purposes of the present invention, what be enough to arouse attention is that on all interested frequencies, thunderbolt is accompanied by the EMI pulse that can discern on several kilometers distance.
As the result of EMI pulse, in adjacent domain, the main RF channel that disturbs during the thunderbolt.Can be embodied in AM/FM radio, TV owing to the caused EMI of thunderbolt with the form that static noise (static), click (click), scratching noise (scratches), picture disturb or sound is lost and so on to the infringement of RF receiver or in supply line.RF channel disturbance that can sensing is caused by thunderbolt on very large distance.Special-purpose large-scale lightning detection device can be surveyed the lightning disturbance on the distance of distance thunderbolt several hundred kilometers, it is electrical interference (sferics) in so-called day, even these detectors are operated by measuring induction field usually as the present invention, rather than operate by the interference of measuring in audio frequency or the RF signal.
Known common AM radio is being subjected to the EMI disturbance apart from thunderbolt on up to 30km or farther distance, this in addition can in sound signal, directly hear, be similar to various clicks.On the frequency higher than AM frequency band (SW, LW, MW), signal is usually owing to a little less than the mechanism of atmospheric attenuation and different reasons becomes very, but still detectable on very big distance.
Though in known mobile RF equipment,, eliminated the electromagnetic interference (EMI) in the RF signal that receives immediately by filtering or as the result who uses modulation, this type of electromagnetic interference (EMI) in the RF channel that the present invention proposes to estimate to monitor such as in common mobile phone.Cause if the interference that detects looks like by thunderbolt, then can give a warning to the user of for example mobile phone.For example, if, can suppose that then this interference is caused by thunderbolt if interference has surpassed predetermined threshold value or it has the frequency spectrum that belongs to the characteristic of being struck by lightning.Just can open lightning detection as long as open the RF detection.
Therefore, the invention provides the new security feature that in the mobile RF equipment of for example cell phone and so on, to realize.
Though in a lot of situations, also fail to use the cost of special-purpose lightning detection and difficulty to make us understanding for the hope of surveying the thunderbolt in the adjacent domain even as big as proof, but a lot of people should wish low-cost sensing system, it can carry out integrated, particularly integrated with mobile phone with the equipment that these people have carried in any situation.Known technology is not provided in the known mobile RF equipment this type of lightning detection is integrated as new function.
In the known commercial lightning detection device of major part, in frequency band low relatively than the RF frequency, promptly on audio band, survey the electromagnetic signal that comes from lightning.Because the audio codec in the mobile RF equipment will amplify 40dB to 60dB up to the signal on the 48kHz bandwidth usually, therefore, audio codec can also be used for the signal that comes from the lightning detection front end is carried out method and further processing.Audio codec also comprises the high-quality A/D converter that also can be used in the lightning detection.Except amplifying and A/D changes, some part of the digital audio processing piece in this codec can be used in the signal Processing in the lightning detection.
Therefore, according to a first aspect of the invention, the present invention is based on use as the audio codec in the mobile RF equipment of lightning detection device.
For a first aspect of the present invention, therefore proposing the lightning detection device is the mobile RF equipment that is equipped with audio codec, thereby the prime amplifier of this codec is used for the amplification of the lightning signal surveyed, the A/D of the lightning signal that the A/D converter of this codec is used to amplify conversion, thereby and the digital audio processing unit of this codec be used for the signal Processing of this lightning detection.
In preferred implementation of the present invention, the lightning detection front end is in parallel with microphone, thereby the input of the microphone of audio codec is shared by lightning detection and Another application.
In second preferred implementation of the present invention, other microphone that is not used inputs are used as the lightning detection front-end interface.
According to other embodiments of the present invention, in lightning detection, use the audio coder ﹠ decoder (codec) of mobile RF equipment, thereby in the audio coder ﹠ decoder (codec) path, handle the lightning signal of A/D conversion, and, use digital signal processing (DSP) method to analyze the symbol of surveying and exporting by audio coder ﹠ decoder (codec) from the angle of lightning detection.
Still according to other embodiments of the present invention, the described amplification path of audio codec combines with the AM of mobile RF equipment and/or FM radio receiver and is used for lightning detection.
Still, described lightning detection is carried out as the combination of the detection on two or more frequency channels according to other embodiments of the present invention.
Still, have at least two microphone inputs that can be used for lightning detection, and lightning detection is carried out on two different audio bands at least according to other embodiments of the present invention.
Still according to other embodiments of the present invention, the aerial coil that uses quadrature on two positions is to realize surveying the detector of thunderbolt direction.
Still according to other embodiments of the present invention, determine when RF equipment is included in thunderbolt mobile RF equipment towards device.
Still according to other embodiments of the present invention, the thunderbolt information stores that detects that comprises event time is in storer, to determine described possible thunderbolt and the distance between the described mobile device.
Still according to other embodiments of the present invention, mobile RF equipment can be stored the additional weather information that receives from network in described storer.
Still according to other embodiments of the present invention, weather information may be displayed on the display, illustrate thunderstorm intensity, distance and with respect to thunderstorm relatively and true directions.
In the claims that comprise, at length presented property feature according to the method for lightning detection device of the present invention and detection lightning.
The present invention allows to utilize existing framework, module and signaling process or calculability in the mobile RF equipment to create integrated system.
And, when the amplification path in the mobile RF equipment and when preferably also having other parts of audio codec to be used in the lightning detection, because lightning detection does not need independent hardware, so cost and requisite space significantly reduce.
Description of drawings
Below, will be described in greater detail with reference to the attached drawings the present invention, wherein
Fig. 1 shows the schematic block diagram according to system of the present invention;
Fig. 2 shows the frequency spectrum of the electromagnetic signal that is caused by the lightning on the 10km distance;
Fig. 3 is the exemplary circuit of microphone input circuit, thereby this microphone circuit can be divided into microphone and lightning detection front end;
Fig. 4 shows the lightning detection front end of realizing at the audio frequency place;
Fig. 5 a shows the realization that can how to use two lightning detection aerial coils to Fig. 5 c: Fig. 5 a shows the detection on two different frequencies, Fig. 5 b shows by detection and the direction of using two quadrature coils to carry out and estimates, and Fig. 5 c shows the omnirange detection;
Fig. 6 shows special use (propriatory) port that uses in the mobile RF terminal, the removable functional shell of portable terminal and the battery charge coil that is used for lightning detection, and/or be used for the RFID coil of lightning detection;
Fig. 7 show two of the lightning detection antenna towards, in Fig. 7 a antenna for vertically towards and in Fig. 7 b antenna be level towards; And
Fig. 8 schematically shows fuzzy front/rear detection event.
Embodiment
Fig. 1 is the schematic block diagram according to the cellular communication system of support lightning warning of the present invention.This system can for example be a gsm system.
Cellular communication system comprises the base station 20 of cell phone 10 and cellular communications networks.
As shown in Figure 2, most of electromagnetic energy of lightning radiation is near 5kHz (that is audio frequency) on the frequency of 10kHz.Therefore, it is rational carrying out lightning detection on low relatively frequency.Yet, artificial EMC level is the highest on same low frequency, but will therefore advantageously use high slightly lightning detection frequency along with frequency decays fast, perhaps at first higher look-in frequency is down-converted to base band alternatively, avoids being subjected to the interference of artificial EMC thereby lightning detection can take place.
The audio codec that the present invention is based on mobile phone 10 is used as the amplification path, is used for the A/D conversion and the digital processing of lightning detection lightning signal.This thought is to use the input 34 of audio codec to connect antenna (for example, coil) or front end 31, and this front end 31 comprises lightning detection required a plurality of assemblies or frequency conversion apparatus.Lightning detection front end 31 can be in parallel with microphone, thereby the input 32 of the microphone of audio codec 35 is that lightning detection front end 31 and microphone 14 are shared (referring to Fig. 3) by two application.
Replacedly, other microphone that is not used inputs can be exclusively used in the lightning detection front end.According to the performance of audio coding decoding, before signal can be input to audio codec, may need some filtering and amplification, thereby obtain enough Performance Characteristicses at the lightning detection front end.
The simulation lightning detection signal that comes from front end amplifies and carries out the A/D conversion in audio codec.Audio codec also comprises the analog or digital wave filter.After A/D conversion and filtering, can use digital signal processing (DSP) method to analyze the lightning detection signal, and can be presented on (that is, display and/or loudspeaker) on the device user interface about the information of the lightning surveyed.
Have the input of one or more microphones audio codec can also by by the lightning front end and for example headset accessory share input and use.Replacedly, lightning detection device frontal attachments may be attached at the same I/O connector (for example, POP port) that is used for earphone or exempts to hand (hans-free) annex.This type of special-purpose Nokia POP connector is shown among Fig. 6 63.All can be attached Nokia POP port annex can comprise circuit (ACI chip), wherein store for the optimization of this DSP and use required parameter.By using the parameter among the ACI, DSP is configured to support better to be attached to the use of the annex on the POP port.
Replacedly, lightning detection device frontal attachments may be included in the movably functional shell 62 of user of portable terminal device 60, perhaps can be embedded in the circuit that uses battery charge unicoil 61 or multi-thread circle 61 to carry out contactless charging.
From realizing angle, an important problem is the realization of lightning detection antenna on audio frequency.Usually, antenna is realized as independent coil.Yet coil needs very big area and space, and therefore crucial is to find the effective means that realizes coil/a plurality of coils in target device.In the present invention, the amplification path of audio codec can be used in combination with the secondary coil (or multi-thread circle) 61 that is used for the induced cell charging.
The lightning detection front end can realize on audio frequency, for example as shown in Figure 4.This lightning detection aerial coil L and front end can be realized by the topology that is for example presented.Coil L and capacitor C comprise bandpass filter, and need diode D
1And D
2Protect gain stage to avoid the injury of too big voltage peak.Before signal can being routed to audio codec, may need to have gain resistance R is set
1, R
2Optional operational amplifier level 41, on whole amplification path, to obtain enough gains.
The design of low side lightning detection device has the gain of 76dB usually on the look-in frequency band.Because known audio codecs has 34 to 59.5dB gain usually, so may need some additional amplification on whole amplification path, to reach sufficient gain.Yet under the situation in any additional amplification path that does not have audio codec, it is possible reaching the enough gains that are used for lightning detection on audio frequency.
Also may in lightning detection, use audio coder ﹠ decoder (codec).Lightning signal through A/D conversion can use voice edition sign indicating number device path to handle, and from the angle of lightning detection, can use digital signal processing (DSP) method to come the analyzing speech codec to survey and the symbol of output.And the combination of voicefrequency circuit 51,52 and audio coder ﹠ decoder (codec) 53 also can be used to analyze this lightning signal.In lightning detection, use the advantage of audio coder ﹠ decoder (codec) to be, can not use audio coder ﹠ decoder (codec) usually for a long time and therefore can strengthen its utilization factor.
Replacedly, the amplification path of audio codec can be used for lightning detection in conjunction with AM or FM radio receiver.Although as mentioned above, the present invention is based on the detection on the audio frequency, but also can be at these high frequencies, such as carrying out this detection on AM (150kHz-30MHz) and FM (876.5-108MHz) rf frequency by using low-converter that high-frequency signal is down-converted to audio frequency.The optimization result that can realize is the combination of surveying as on two or more frequency channels enough far away apart each other.Some survey and distance measurement method based on the differential declines of lightning noise on different frequency, and so the combination of two or more receivers provide the better estimation of the distance of lightning activity in the thunderstorm of adjusting the distance.
And, by using AM or FM receiver front end, and survey audio coding decoding (TX) path of chain and use the coding that produces as the input of digital signal processing (DSP) method or use the decoding path (RX) of identical codec to come amplifying signal for this purpose by using as a part, can survey the signal that comes from lightning, thereby survey and the lightning signal is classified.
If it is available surpassing a microphone input, then lightning detection can carry out on two different audio bands, this make survey and analyze more accurate.With reference to Fig. 5 a that realizes principle is shown.The coil 54,55 of two quadrature location can be used to realize surveying the detector (referring to Fig. 5 b) of thunderbolt direction.This orientation detection be based on be received from quadrature coil level ratio.In addition, two coils can be used to realize omnirange lightning detection device (referring to Fig. 5).The omnirange detector can be realized (such as Fig. 5 b) by the individual channel that use is used to come from coil L1 and L254,55 signal, perhaps coming from the signal of two coils can addition 58 and can analyze as a signal after wave filter 59 carries out possible filtering, such as Fig. 5 c.Certainly, the added signal that comes from totalizer 56 does not provide any information about the thunderbolt direction.Even when the quadrature coil that uses as shown in Figure 8, to direction determine also blur.If receive signal to 82 from forward direction 81 or back, then do not having under the situation of additional antenna, be impossible determine direction.Yet, be received from the weather information of network or, can solve this ambiguity by only requiring the user to import wind direction by combination.Fig. 5 a can also be an inductive charging coil to a coil or two coils among the 5c, such as the charge coil among Fig. 6 61, perhaps can be the coil that is used for some other purpose, such as the coil that is used for the RFID purpose.
The audio codec of Shi Yonging can be the type of using in mobile RF equipment usually in the present invention, and this audio codec can obtain on common market.This type of audio codec is the UEME that for example has the microphone input stage, this microphone input stage comprises the input of three signals, the TLV320AIC23B of 3/1 multiplexer and differential amplifier of microphone and TexasInstruments, it is to have the stereo audio codec that is integrated with Earphone Amplifier.
The present invention can comprise by utilize detector device towards the measurement performance that improves equipment and the thought of current drain.Referring to Fig. 7, wherein show level towards exploring antenna 72 with vertical towards exploring antenna 73 both.
Because the antenna gain of tours antenna is with significantly changing at the function of the position, angle in RF source 71, thus detector towards being used to improve detection, range finding and/or orientation measurement performance.
In fact, all known lightning sounding equipments all rely on to be surveyed the magnetic component in the electromagnetic field (H), exists a coil or two quadrature coils to be used to receive the RF signal of thunderbolt radiation.Because the radiation that comes from thunderbolt is being lower than on the frequency of 50MHz the byest force, is the miniature toroidal antenna so have only the receiving antenna that can be integrated in the mobile device alternative basically.
A center character of coil antenna is the directivity style.This style looks like annulus 74,75, and its axis is parallel with ferrite magnetic wire mandrel 76.If only use an exploring antenna, this detection event is similar to the situation among Fig. 7.Cause the variation of the 10-30dB of induced signal with respect to the angle change in location of the thunderbolt that detects.When this variation occurs in coil axis maintenance level.If this axis normal towards, so with optimize towards comparing induced signal even less than 30dB.
If only use a coil antenna, then the main difficulty in the distance estimations (and detection itself) is the receive direction change antenna gain according to radiation.In theory, according to receiving angle, when receiving the RF radiation that comes from lightning, gain can from 0dB (angle is 0 ° or 180 °) to for example-30dB (90 ° or 270 ° of angles).If antenna gain significantly changes (between two continuous coverages) and location information not, be difficult to then find whether (by only using a coil antenna) changes in amplitude depends on that the radiation length between storm and the detector changes, or whether changes in amplitude is to be changed by the angle that causes the detector that antenna gain changes to cause.
This embodiment handheld device with at least one magnetic coil has been described and determine this equipment towards some method.This method also can be manual (need the user be equipment determine towards).Use combination that the better distance estimations to the lightning source (and also the possibility support direction is searched) is provided.
When known, can solve or minimize at least the directional problems of coil.And, towards quick change can be used to survey the state that can not accurately measure.
Thought of the present invention be utilize the position of lightning detection device equipment, towards and/or movable information compensate the imperfection of the antenna that is used to survey the RF radiation that comes from thunderbolt.Because it mainly is vertical polarization and the strongest on low frequency (being lower than 100MHz) coming from the RF radiation of thunderbolt, so the miniature toroidal antenna is the scheme that has space efficiency most in the use that receives the low frequency RF pulse.High directivity is a typical characteristics of miniature toroidal antenna, and therefore received signal level according to antenna with respect to the source towards and violent the change.
If can define be used for the lightning detection device suitably or optimize detecting location and some other realized towards very being difficult to, seriously move surveying (promptly towards being unsuitable for of (be antenna gain changes very fast) or equipment when equipment so, antenna gain is very little) time, it is irrational surveying thunderbolt.For example, in these environment, can close the lightning detection device saving electric power, and equipment keep static or from the angle of lightning detection be in more optimize towards the time can proceed to survey.
In fact, if the directional information of identification equipment is not vital.The simplest mode can be will to be integrated on the mobile detector in the mode identical with flux gate compass 19 among Fig. 1 by using magnetometer or accelerator sensor to measure towards, these sensors.Use for reality, should carry out slope compensation, thereby allow not lose the direction accuracy being different from use on the plane of horizontal plane to this compass.Another feasible replaceable scheme is from obtaining indication as the user interface of user's input, this indication from the angle of lightning detection how to have indicated for equipment determine towards, but thereby and work as from the weather information time spent that network receives, additional information is associated therewith.
The basic thought of present embodiment can much independently use in the embodiment, and following embodiment is described different detection principles.This tabulation begins with the simplest realization example and has listed more complicated combination at last in embodiment tabulation.The typical characteristics of miniature toroidal antenna all be effectively in all embodiments and the indicating equipment that comes from sensor or other sources (that is, coming from the user) towards or the information of position use in every way.
The simplest may embodiment in, towards and/or motion detector be used for determining whether equipment is static.Be to carry out under the static condition to measure only, because like this gain is a constant at equipment.
The simplest realization of the present invention only utilizes detector whether to keep static information.Because the radiation style of coil antenna has directivity, so, can not think that then acquisition environment is constant if equipment moves.If it is static for example the realization of simple lightning detection algorithm being needed equipment, such as in some commercial lightning indicator, wherein need be about the indication of detector device motion.
If detector is moving and have uncertainty on detection accuracy, then can close this detection feature.Another interchangeable scheme is to remain on trigger mode, wherein only surveys lightening pulse and for example carries out distance estimations under the static condition.
If one or two coil antenna is used to receive the RF radiation that comes from thunderbolt, then can define optimization position from detection angle.Optimization in the time can being the axis horizontal of coil antenna towards.This means because the strongest radiation is a vertical polarization, if the axis of aerial coil approaches vertically, and the coupling very little (or the coupling that comes from the channel that is struck by lightning stems from than the more inconsistent horizontal channel part of vertical channel component) between thunderbolt channel and the aerial coil then is unworthy measuring or surveying thunderbolt.
In actual conditions, when this equipment in pocket/bag the time (in this case, being zero), this means the 2D equipment of for example forbidding (detector that promptly only comprises a coil) with the one side on the direction that main signal arrives.
In more advanced realization, (that is, comprise two quadrature coils that have two independent receive channels), realize, then can close one of them channel if survey towards being difficult to.
As shown in Fig. 7 b, the angle towards from lightning detection the during axis normal of coil antenna is not the most useful.The thunderbolt channel normally vertical and therefore can mainly regard the RF radiation that comes from thunderbolt as vertical polarization.If the axis of coil antenna is not a level, then Ou He signal intensity can compensate by use angle.
By having the mobile device of user interface, may advise the user preferably mobile device and definite equipment towards.Optimization towards be disturb minimum towards.There is local interference source (for example fluorescent light) in this hypothesis.In other words, this detector device is positioned, thereby interference source is on the direction parallel with coil axis.
Distance estimations more accurately can advise that then the user remains on detector on the direction of two quadratures if desired.This in fact only uses a coil to set up " virtual orthographic coil to ".In unicoil is realized, on two diverse locations, for example estimate this distance according to two continuous thunderbolts.
The measurement situation is similar to situation about describing among Fig. 7.The suggestion detecting devices remain on two quadratures towards last, shown in Fig. 7 a and Fig. 7 b.For the required algorithm of the enough range observations accurately of continuous thunderbolt may two towards on a plurality of thunderbolts that detect.According to this estimation and probe algorithm suggestion user to his equipment redefine towards.
If the lightning detection device uses two (or or even three) quadrature coils as receiving antenna, then Lei Ji directional information may be available.Yet, if only use relation from the coupling signal of quadrature coil, there is 180 ° uncertainty (referring to Fig. 7, if thunderbolt occurs in position 81 or 82, the then signal similar of Tan Ceing) so by the orientation measurement of only using two quadrature coils that storm is carried out.By using three coils, directional information can be available.
If detector can define at the thunderbolt or the directional information of vortex, so the directional information of this detection can be used for during continuous coverage collecting device towards data, and can provide more accurately at the direction of being struck by lightning.
For the uncertainty that overcomes in the definition thunderbolt direction 180 °, a suggestion is in a lot of situations, if can define the direction (83 and 84) that thunderbolt not have generation, then to have had enough information.Another interchangeable scheme is the input wind direction.In arbitrary situation, if the user moves to direction 83 or 84, then he can avoid near storm or obtain more time looking for the cover most possibly.Certainly, direction is estimated and can be upgraded in the time after a while that storm is toward or away from.
An embodiment uses two patterns: trigger mode, find that any interference all starts this pattern (can be the relevant interference of lightning at least) whenever.Then, this trigger mode starts true sensing modes, and if desired, optionally changes display mode.Notify the user correctly equipment is determined towards (for example, lying on the desk).Only when correct, just carry out distance estimations when this.
Be in more or less the uniform motion if suppose the user, this angle covers all possible angle and eliminates gain parameter so.For good statistical estimate, this needs considerable time.The simpler version of this situation is to allow the user on desk lid equipment be rotated several times, so that cover most of angle.Especially, make the user that equipment is remained on one towards the preceding paragraph time, then it is changed 90 degree, this allows to cover minimum and maximum gain.
Finally, front end can be integrated in the mobile RF equipment, but it also can be independently indicating equipment or it even can be integrated into the outside of this RF equipment, for example is integrated in the called function shell 62 as shown in Figure 6.This type of user's changeable functionality shell that comprises lightning detection front end 31 can be used as annex and sells.
It will be apparent to those skilled in the art that different embodiment of the present invention is not limited to above-mentioned example, but they can change within the scope of the appended claims.
Claims (27)
1. a mobile lightning detection device is embodied as mobile RF equipment, comprise,
The lightning detection front end is used to survey the lightning signal; And
Audio codec, this audio codec comprises:
Prime amplifier is used for the lightning signal of being surveyed is amplified;
The A/D converter device is used for the lightning signal that is amplified is carried out the A/D conversion; And
Digital signal processor is used for handling through the lightning signal of A/D conversion.
2. mobile lightning detection device according to claim 1 is characterized in that described lightning detection front end is in parallel with microphone, thereby the input of the microphone of audio codec is shared by described lightning detection and Another application.
3. mobile lightning detection device according to claim 1 is characterized in that, the microphone input that is not used is used as the lightning detection front-end interface.
4. mobile lightning detection device according to claim 1, it is characterized in that in lightning detection, using the audio coder ﹠ decoder (codec) of mobile RF equipment, thereby utilize described audio coder ﹠ decoder (codec) path to handle the lightning signal of changing through A/D, and from the angle of lightning detection, the symbol of in DSP described audio coder ﹠ decoder (codec) being exported and being surveyed is analyzed.
5. mobile lightning detection device according to claim 1, it is characterized in that, described audio codec is used as the amplification path, this amplification path is used for combining with the AM of mobile RF equipment and/or FM radio receiver carries out lightning detection, thereby utilizes low-converter that AM and/or FM radio frequency are down-converted to audio frequency.
6. mobile lightning detection device according to claim 1 is characterized in that, have at least two microphone inputs that can be used for described lightning detection, and described lightning detection is carried out on two different audio bands at least.
7. mobile lightning detection device according to claim 1 is characterized in that, described lightning detection is carried out as the combination of the detection on two or more frequency channels.
8. mobile lightning detection device according to claim 1 is characterized in that, the aerial coil that uses quadrature on two positions is to realize surveying the detector of thunderbolt direction.
9. method that is used for being undertaken lightning detection by mobile lightning detection device, this moves the mobile RF equipment that the lightning detection device is embodied as provides audio codec, and this method comprises:
Bring in detection lightning signal before using lightning detection;
Use the prime amplifier of described audio codec that the lightning signal of being surveyed is amplified;
Use the A/D converter of described audio codec that the lightning signal that is amplified is carried out the A/D conversion; And
The digital signal processor that uses described audio codec is to handling through the lightning signal of A/D conversion.
10. method according to claim 9 is characterized in that, described lightning detection front end is in parallel with microphone, thereby the input of the microphone of audio codec is shared by described lightning detection and Another application.
11. method according to claim 9 is characterized in that, the microphone input that is not used is used as the lightning detection front-end interface.
12. method according to claim 9, it is characterized in that in lightning detection, using the audio coder ﹠ decoder (codec) of mobile RF equipment, thereby utilize described audio coder ﹠ decoder (codec) path to handle the lightning signal of changing through A/D, and from the angle of lightning detection, the symbol of in DSP described audio coder ﹠ decoder (codec) being exported and being surveyed is analyzed.
13. method according to claim 9, it is characterized in that, described audio codec is used as the amplification path, this amplification path is used for combining with the AM of mobile RF equipment and/or FM radio receiver carries out lightning detection, thereby utilizes low-converter that AM and/or FM radio frequency are down-converted to audio frequency.
14. method according to claim 9 is characterized in that, have at least two microphone inputs that can be used for lightning detection, and described lightning detection is carried out on two different audio bands at least.
15. method according to claim 9 is characterized in that, described lightning detection is carried out as the combination of the detection on two or more frequency channels.
16. method according to claim 9 is characterized in that, the aerial coil that uses quadrature on two positions is to realize surveying the detector of thunderbolt direction.
17. mobile lightning detection device according to claim 6, it is characterized in that, in addition, two coils can be used to realize omnirange lightning detection device, thereby described omnirange detector can be realized by using independent channel, perhaps can will come from the signal plus of two coils and analyze as a signal.
18. method according to claim 14, it is characterized in that, in addition, two coils can be used to realize omnirange lightning detection device, thereby described omnirange detector can be realized by using independent channel, perhaps can will come from the signal plus of two coils and analyze as a signal.
19. mobile lightning detection device according to claim 1 is characterized in that, described RF equipment comprise determine described mobile RF equipment towards device.
20. method according to claim 14 is characterized in that, in described method, comprises that measurement performance and the current drain towards to described equipment by using detector device improves.
21. method according to claim 20 is characterized in that, towards and/or motion detector be used for determining whether described equipment is static, and described measurement is only carried out when being static at described equipment.
22. method according to claim 14 is characterized in that, the thunderbolt information stores that is detected that comprises event time is used for determining described possible thunderbolt and the distance between the described mobile device in storer.
23. method according to claim 14 is characterized in that, described mobile RF equipment can be stored the additional weather information that receives from network in described storer.
24. method according to claim 14 is characterized in that, described weather information may be displayed on the display, with intensity that thunderstorm is shown, distance and at this thunderstorm relatively and true directions.
25. mobile lightning detection device according to claim 1 is characterized in that, described lightning detection front end is integrated on the described mobile RF equipment.
26. mobile lightning detection device according to claim 1 is characterized in that, described lightning detection front end is a pointer device or be integrated in described RF device external independently.
27. mobile lightning detection device according to claim 1 is characterized in that, at least one probe coil is the one or more inductive charging coils that are used for some other purpose.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FI2005/000444 WO2007042599A1 (en) | 2005-10-14 | 2005-10-14 | Detection of lightning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101287993A CN101287993A (en) | 2008-10-15 |
| CN101287993B true CN101287993B (en) | 2011-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200580051826XA Expired - Fee Related CN101287993B (en) | 2005-10-14 | 2005-10-14 | Lightning detection |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1946127A4 (en) |
| JP (1) | JP4741674B2 (en) |
| KR (1) | KR101031601B1 (en) |
| CN (1) | CN101287993B (en) |
| BR (1) | BRPI0520643A2 (en) |
| WO (1) | WO2007042599A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009111394A1 (en) * | 2008-03-02 | 2009-09-11 | Thomas Gorman | Severe weather, environmental and mass notification warning system and method |
| CN101893661B (en) * | 2010-08-06 | 2012-06-06 | 浙江大学 | Optical and electromagnetic signal synchronous monitoring lightening data processing method |
| JP2013148535A (en) * | 2012-01-23 | 2013-08-01 | Osaka Univ | Lightning discharge position orientation method and lighting discharge position orientation system |
| CN112727710B (en) * | 2020-12-15 | 2022-02-11 | 北京天泽智云科技有限公司 | Wind field thunderbolt density statistical method and system based on audio signals |
| CN113552445B (en) * | 2021-06-17 | 2023-03-14 | 昆明理工大学 | Multiple lightning stroke waveform parameter identification method |
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| US5263368A (en) * | 1992-04-27 | 1993-11-23 | Skyscan Technologies, Inc. | Hand-held lightning detection and ranging device |
| US5537318A (en) * | 1994-07-13 | 1996-07-16 | B. F. Goodrich Flightsystems, Inc. | Lightning strike detection and mapping system |
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| US20050197070A1 (en) * | 2004-03-04 | 2005-09-08 | Nokia Corporation | Detection of lightning |
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| JPH1118285A (en) * | 1997-06-23 | 1999-01-22 | Nec Home Electron Ltd | Protector against lightning surge |
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| US7016785B2 (en) * | 2004-03-04 | 2006-03-21 | Nokia Corporation | Lightning detection |
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2005
- 2005-10-14 BR BRPI0520643-0A patent/BRPI0520643A2/en not_active Application Discontinuation
- 2005-10-14 JP JP2008535051A patent/JP4741674B2/en not_active Expired - Fee Related
- 2005-10-14 EP EP05799266.1A patent/EP1946127A4/en not_active Withdrawn
- 2005-10-14 WO PCT/FI2005/000444 patent/WO2007042599A1/en active Application Filing
- 2005-10-14 CN CN200580051826XA patent/CN101287993B/en not_active Expired - Fee Related
- 2005-10-14 KR KR1020087011427A patent/KR101031601B1/en not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5263368A (en) * | 1992-04-27 | 1993-11-23 | Skyscan Technologies, Inc. | Hand-held lightning detection and ranging device |
| US5541501A (en) * | 1992-04-27 | 1996-07-30 | Skyscan Technologies, Inc. | Lightning and storm warning method and apparatus |
| US5537318A (en) * | 1994-07-13 | 1996-07-16 | B. F. Goodrich Flightsystems, Inc. | Lightning strike detection and mapping system |
| US6232882B1 (en) * | 2000-07-19 | 2001-05-15 | Spectrum Electronics, Inc. | Warning system and method for detection of tornadoes |
| CN1646928A (en) * | 2002-02-13 | 2005-07-27 | 瓦尔萨拉有限责任公司 | Lightning detection and data acquisition system |
| US20050197070A1 (en) * | 2004-03-04 | 2005-09-08 | Nokia Corporation | Detection of lightning |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007042599A1 (en) | 2007-04-19 |
| BRPI0520643A2 (en) | 2009-05-19 |
| JP2009511888A (en) | 2009-03-19 |
| CN101287993A (en) | 2008-10-15 |
| KR20080065658A (en) | 2008-07-14 |
| KR101031601B1 (en) | 2011-04-27 |
| JP4741674B2 (en) | 2011-08-03 |
| EP1946127A1 (en) | 2008-07-23 |
| EP1946127A4 (en) | 2014-04-23 |
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