CN101840624A - Wireless security alarm system, device and method - Google Patents
Wireless security alarm system, device and method Download PDFInfo
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- CN101840624A CN101840624A CN200910261716A CN200910261716A CN101840624A CN 101840624 A CN101840624 A CN 101840624A CN 200910261716 A CN200910261716 A CN 200910261716A CN 200910261716 A CN200910261716 A CN 200910261716A CN 101840624 A CN101840624 A CN 101840624A
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- alerting signal
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
Abstract
The embodiment of the invention discloses a wireless security alarm system, a device and a method to solve the problem of the prior wireless security alarm system working in single frequency band that fails to alarm due to the interference of the same frequency and adjacent frequency, wherein the wireless security alarm system comprises a frontend wireless emitting unit for sending alarm signals at different frequency bands when an event happens and a wireless receiving unit for receiving the alarm signals sent by the frontend wireless emitting unit and handling the events according to the alarm signals. The frontend wireless emitting unit and the wireless receiving unit communicate by a plurality of frequency bands, so that when certain frequency band is interfered by the same frequency or the adjacent frequency, other frequency can keep the normal communication, thereby solving the problem of prior wireless security alarm system working in single frequency band that fails to alarm due to the interference of the same frequency and adjacent frequency.
Description
Technical field
The present invention relates to the wireless communication technique field, more particularly, relate to wireless security alarm system, apparatus and method.
Background technology
Wireless security alarm system mainly (also can be described as warning probe unit/equipment by front end wireless transmitting unit/equipment, specifically can be a magnetic inductor, infrared inductor, microwave detector, ceiling type thermosonde, gas leakage detector, smoke alarm, flash appeal button etc.) and radio receiving unit/equipment (as the controlling alarm main frame) composition, large-scale wireless security alarm system then mainly is made up of front end wireless transmitting unit/equipment, radio receiving unit/equipment and alarm monitoring center.When alert takes place, front end wireless transmitting unit/equipment sends alerting signal to radio receiving unit/equipment, radio receiving unit/equipment receives also to be done corresponding alert according to this alerting signal and handles, as dial automatically preset number or with alarm monitoring center communication or the like.
At present, the main 315MHz of use (China and the U.S. use more), 433MHz (China and Europe), 868MHz (Europe is used more), 915MHZ several open frequency ranges such as (U.S. use more) are carried out communication between the front end wireless transmitting unit/equipment of wireless security alarm system and the radio receiving unit/equipment, and, only select for use single frequency band (such as 315M) to carry out communication between the radio-cell/equipment of a general cover wireless security alarm system.This type systematic very easily is subjected to from various radio-cell/equipment, high-power electric unit/device, and the electromagnetic co-channel interference that produces of other various situations (as sunspot explosion, motor car engine, various motor, electric operation etc.) (comprising the malice co-channel interference that co-channel interference that the various radio-cell/equipment of operate as normal cause and offender utilize interference unit that wireless security alarm system is carried out) or adjacently disturb frequently.These all cause the normally alerting signal of receiving front-end wireless transmitting unit/equipment transmission of radio receiving unit/equipment, the appearance that causes failing to report alert phenomenon.
Summary of the invention
In view of this, the object of the invention is to provide wireless security alarm system, apparatus and method, and existing to solve, as to be operated in single frequency band wireless security alarm system is because of being subjected to co-channel interference or the adjacent alert problem of failing to report that causes of disturbing frequently.
For achieving the above object, the invention provides following technical scheme:
A kind of wireless security alarm system comprises:
The front end wireless transmitting unit is used for sending a plurality of alerting signals that are in different frequency range when alert takes place;
Radio receiving unit is used to receive the alerting signal that described front end wireless transmitting unit sends, and carries out corresponding alert according to described alerting signal and handle.
A kind of front end wireless transmitting device comprises:
The front end wireless transmitting unit is used for sending a plurality of alerting signals that are in different frequency range when alert takes place.
A kind of radio receiver comprises:
Radio receiving unit is used to receive alerting signal, and carries out corresponding alert according to described alerting signal and handle;
The caution unit is used for when the alerting signal of all frequency ranges all is interfered, and malicious interference takes place in caution.
A kind of wireless security alarm method based on wireless security alarm system, described wireless security alarm system comprises front end wireless transmitting unit and radio receiving unit, described method comprises:
Described front end wireless transmitting unit sends a plurality of alerting signals that are in different frequency range to described radio receiving unit when alert takes place;
Described radio receiving unit receives the alerting signal that described front end wireless transmitting unit sends, and carries out corresponding alert according to described alerting signal and handle.
From above-mentioned technical scheme as can be seen, front end wireless transmitting unit in the wireless security alarm system of the present invention and radio receiving unit adopt a plurality of frequency ranges to carry out communication, when certain frequency range suffers co-channel interference or adjacent frequently the interference, other frequency ranges also can keep normal communication, thereby have solved existing wireless security alarm system that uses single frequency band because of being subjected to co-channel interference or the adjacent alert problem of failing to report that causes of disturbing frequently.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is wireless security alarm system structural representation that the embodiment of the invention provided;
Fig. 2 a is another structural representation of wireless security alarm system that the embodiment of the invention provided;
Fig. 2 b is the another structural representation of the wireless security alarm system that the embodiment of the invention provided;
Fig. 3 is front end wireless transmitting device structural representation that the embodiment of the invention provided;
Fig. 4 is radio receiver structural representation that the embodiment of the invention provided;
Fig. 5 is wireless security alarm method flow diagram that the embodiment of the invention provided.
Embodiment
For quote and know for the purpose of, hereinafter the technical term of Shi Yonging, write a Chinese character in simplified form or abridge to sum up and be explained as follows:
ASK:Amplitude Shift Keying, amplitude shift keying;
OOK:On-OffKeying, the scale-of-two on off keying;
FSK:Frequency-shift keying, frequency shift keying;
GFSK:Gauss frequency Shift Keying, Gaussian Frequency Shift Keying;
Co-channel interference can drop on useful signal and receive the interior various electromagnetic interference (EMI) of passband;
Adjacent interference frequently, the interference between side frequency;
China stipulates the use of wireless security alarm system/device:
The frequency of utilization scope is 314-316MHz, 430-432MHz, and 433.00-434.79MHz;
Occupied bandwidth: be not more than 400kHz;
The duration of each wireless signal transmission is no more than 1 second.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention discloses a kind of wireless security alarm system, existing to solve, as to be operated in single frequency band wireless security alarm system is because of being subjected to co-channel interference or the adjacent alert problem of failing to report that causes of disturbing frequently.
Fig. 1 shows a kind of structure of said system, comprises front end wireless transmitting unit 101 and radio receiving unit 102, wherein:
Front end wireless transmitting unit 101 is used for sending a plurality of alerting signals that are in different frequency range when alert takes place;
It should be noted that the front end wireless transmitting unit can comprise a plurality of subelements, and the alerting signal that arbitrary subelement sent is in different frequency ranges with the alerting signal that other subelements send.
Radio receiving unit also can comprise a plurality of subelements, and the alerting signal that arbitrary subelement received is in different frequency ranges with the alerting signal that other subelements are received.
In China, radio-cell/equipment works in 315MHz frequency range and 433MHz frequency range more, as not having special declaration, the radio-cell/equipment among all embodiment of the present invention (comprising front end wireless transmitting unit/equipment and radio receiving unit/equipment) all is operated in 315MHz frequency range and these two frequency ranges of 433MHz.
When wireless transmitting unit 101 uses 315M and these two frequency ranges of 433M to send alerting signal, may run into following several co-channel interference or adjacent interference frequently:
The alerting signal of 315M frequency range is subjected to other electromagnetic co-channel interference that normal radio-cell that uses/equipment produces or adjacent frequency disturbs.At this moment, because the 433MHz frequency range is separated by far away apart from the 315M frequency range, therefore the alerting signal for the 315M frequency range can cause co-channel interference or the adjacent electromagnetic wave that disturbs frequently to cause interference to the alerting signal of 433M frequency range, but also is still operate as normal of 433M frequency range, and vice versa;
The alerting signal signal of 315M frequency range is subjected to the electromagnetic co-channel interference or the adjacent interference frequently of other high-power unit/device and other various situations generations.At this moment, but 433M frequency range operate as normal still, and this electromagnetic wave that is high-power unit/device far away, general and other various situations produce because 315M and two frequency ranges of 433M are separated by can not produce so big electromagnetic wave of frequency coverage.Otherwise, when the alerting signal signal of 433M frequency range is subjected to electromagnetic co-channel interference that other high-power unit/device and other various situations produce or adjacent frequently the interference, but also operate as normal of 315M frequency range;
The alerting signal of 315M frequency range is subjected to the high-power fixed malice co-channel interference of interference unit frequently of 315M.At this moment, all right operate as normal of 433M frequency range, vice versa.
As seen, when front end wireless transmitting unit 101 adopts 315M and two frequency ranges of 433M to carry out communication with radio receiving unit 102, if wherein certain frequency range is subjected to co-channel interference or adjacent interference frequently, another frequency range still can keep normal communication, thereby has solved wireless security alarm system existing, that only use single frequency band because of being subjected to co-channel interference or the adjacent alert problem of failing to report that causes of disturbing frequently.
Certainly, owing to be used for the frequency range of radio-cell/device talk in the global range 315MHz, 433MHz, 868MHz and 915MHZ are arranged, therefore, when specific implementation, those skilled in the art can therefrom choose 2,3 and even 4 frequency range collocation uses (the many more level of securitys of use frequency range are also just high more) as required, do not give unnecessary details at this.
Need to prove that the wireless security alarm system that has at present adopts frequency hop spread spectrum to solve problem of co-channel interference.The characteristics of this technology are, in certain frequency range (such as 315M) bandwidth range, several frequencies of redirect automatically are set, when sending alerting signal, the front end wireless transmitting unit just taken (co-channel interference also takes place) by the miscellaneous equipment of same frequency as if a certain frequency, the front end wireless transmitting unit can jump to another frequency automatically and go to send alerting signal so, thereby reaches the purpose of anti-co-channel interference.But because frequency resource is limited, the bandwidth of a frequency range often has only 1-2MHz, and in so narrow bandwidth, selectable frequency hopping frequency is very limited.Thereby, when Electromagnetic Interference that runs into high-power unit/device generation (bandwidth of the Electromagnetic Interference frequency that high-power unit/device produces often surpasses the bandwidth of whole frequency hopping frequency range) or 315M full frequency band malicious interference, frequency hop spread spectrum has just lost the effectiveness of self.Therefore, existing frequency hopping can only be separated never by the interference of other normal same frequency radio-cell/equipment that uses, but interference strong, that frequency coverage is bigger then can't be taken precautions against.And therefore the wireless security alarm system in the present embodiment does not exist the problems referred to above owing to be at least functioning on two frequency ranges.
In the above-described embodiments, same warning message sends with the form of a plurality of alerting signals of taking different frequency range (promptly using different carrier frequency).The above-mentioned a plurality of alerting signals that are in different frequency range of front end wireless transmitting unit disposable transmission simultaneously, also can repeatedly send above-mentioned a plurality of alerting signal according to certain sequential, can also send same warning message several times, send a plurality of alerting signals that take different frequency range at every turn.
When a cover comprises a more than front end wireless transmitting unit in the wireless security alarm system, if just have a plurality of front end wireless transmitting unit to send alerting signal at synchronization just, the phenomenon of co-channel interference will appear in the alerting signal that above-mentioned a plurality of front end wireless transmitting unit send.Such as: front end wireless transmitting unit 1 at a time sends the alerting signal of 315MHZ and 433MHZ to radio receiver, just front end wireless transmitting unit 2 also sends the alerting signal of 315MHZ and 433MHZ to radio receiver at synchronization, so, will there be co-channel interference between the alerting signal of the 315MHz that the alerting signal of the 315MHz that front end wireless transmitting unit 1 sends and front end wireless transmitting unit 2 send, and also can has co-channel interference between the alerting signal of the 433MHz that the alerting signal of the 433MHz that front end wireless transmitting unit 1 sends and front end wireless transmitting unit 2 send.The alerting signal that will cause front end wireless transmitting unit 1 or front end wireless transmitting unit 2 to send is like this missed.In addition, also may there be co-channel interference between overlapping in the wireless security alarm system more.
For avoiding the generation of above-mentioned situation, referring to Fig. 2 a, wireless security alarm system also can comprise sending controling unit 201, is used to control the time interval that front end wireless transmitting unit 202-204 sends alerting signal.
Can include only a sending controling unit in the one cover wireless security alarm system and control all front end wireless transmitting unit, also can control by all corresponding sending controling unit of each front end wireless transmitting unit.
For the co-channel interference that may exist between different front end wireless transmitting unit in the same wireless security alarm system, can solve in the following ways: when alert takes place in front end wireless transmitting unit 202 and 203 locations simultaneously need be when radio receiving unit 205 sends alerting signals, sending controling unit 201 control front end wireless transmitting unit 202 are with 315MHz alerting signal and the 500ms transmission at interval of 433MHz alerting signal, and control front end wireless transmitting unit 203 with 315MHz alerting signal and the 800ms transmission at interval of 433MHz alerting signal, front end wireless transmitting unit 202 and 203 can guarantee that at least 433MHz alerting signal separately can be received by radio receiving unit 205 like this.Owing to be in the transmitting time of the alerting signal of two frequency ranges the interval is arranged in addition, two frequency range alerting signals send at interval can be avoided producing between the two frequency range alerting signals to shake when sending disturbing.Certainly, also can carry out dynamic change the interval time that front end wireless transmitting unit 202 sends the alerting signal of two frequency ranges under the control of transmit control device 201, as when certain once alert takes place, it sends interval time is 500ms, and becomes 600ms or 300ms or the like when alert taking place next time.In like manner, the interval time of the alerting signal of front end wireless transmitting unit 203 transmissions two frequency ranges also can dynamic change.Those skilled in the art can be provided with when specific implementation flexibly, as long as front end wireless transmitting unit 202 and 203 has at least the alerting signal of a certain frequency range to be received by radio receiving unit 205 separately.And if alert all takes place in front end wireless transmitting unit 202-204 location simultaneously, then can control with reference to aforesaid way, do not give unnecessary details at this;
Certainly, sending controling unit 201 also can be when repeatedly sending same warning message, sends the mode of the interval time of warning message twice and avoid the co-channel interference between a plurality of front end wireless transmitting unit in the same system by control front end wireless transmitting unit is adjacent.Such as: when alert takes place in front end wireless transmitting unit 202 and 203 locations simultaneously need be when radio receiving unit sends warning message, 60s carries out sending controling unit 201 control front end wireless transmitting unit 202 with sending at interval for the second time with the transmission first of warning message, front end wireless transmitting unit 203 will send first and send interval 70s for the second time carries out and control, and front end wireless transmitting unit 202 and 203 can guarantee that at least the warning message that is sent the second time separately can be received by radio receiving unit 205 like this.
For many covers wireless security alarm system, can utilize front end wireless transmitting unit in sending controling unit control self system in the system separately to send interval time of 315MHz alerting signal and 433MHz alerting signal equally, make it with another system in to send interval time of two frequency range alerting signals different from the elimination co-channel interference; Perhaps, also can utilize sending controling unit in the system separately to control in self system warning message sends first and sends institute's interlude once more, make it with another system in warning message send first and send the different co-channel interferences of avoiding of institute's interlude once more, do not give unnecessary details at this.
In addition, also can avoid co-channel interference in conjunction with following manner: the order that a certain front end wireless transmitting unit sends alerting signal is the alerting signal that sends the 315M frequency range earlier, send the alerting signal of 433MHz frequency range again, the order of another front end wireless transmitting unit transmission alerting signal is then just the opposite.
Preferably, referring to Fig. 2 b, the wireless security alarm system among above-mentioned all embodiment also can comprise caution unit 206, is used for when the alerting signal of all frequency ranges all is interfered, and malicious interference takes place in caution.
In existing single frequency band wireless security alarm system, have a kind of mode promptly to report to the police for being interfered: when radio receiving unit/equipment was interfered in coverage, system will warn the generation malicious interference.There is more serious false alarm phenomenon in this technical scheme, because a large amount of uses along with wireless device, air interference often takes place, but the ratio of malicious interference is lower, have only the talent conference of real preparation crime that wireless security alarm system is carried out malicious interference, the caution that this mode that therefore adopting is interfered promptly reports to the police is sent often all is a false alarm.Some producer improves for this reason, does not promptly send alerting signal when system is interfered at once, but (such as by 60 seconds) just warned after being subjected to interference to reach the regular hour, can reduce some false alarms like this, but not deal with problems fully.And the offender just can carry out PERIODIC INTERFERENCE (stop, and then then disturb) if understand this function after disturbing 50 seconds, and system just can not send caution, will cause new problem-fail to report the police like this, and its consequence is more serious.The caution unit of present embodiment then is when the alerting signal of all frequency ranges all is interfered, and just malicious interference takes place in caution.Because front end wireless transmitting unit and radio receiving unit are operated in 315M and two frequency ranges of 433M, these two frequency ranges are separated by far away, and the electromagnetic frequency range that other radio-cell/equipment of general operate as normal, high-power unit/device and other various situations produce can be so not big.Therefore, when the alerting signal of all frequency ranges all was interfered, its reason was generally the offender wireless security alarm system has been carried out multifrequency or full range malicious interference.As seen, the accuracy rate of caution unit caution generation malicious interference is quite high in the present embodiment.
In addition, the interference that wireless security alarm system also might be subjected to working in the normal wireless equipment of 315M frequency range simultaneously and work in the normal wireless equipment of 433M frequency range, in order further to improve the accuracy rate of caution, predeterminable duration of disturbance threshold values (as 1 second), all be interfered and duration of this interference when surpassing pre-set threshold value when the alerting signal of all frequency ranges like this, meaning just takes place in the caution unit disturbs.
Corresponding with above-mentioned wireless security alarm system, referring to Fig. 3, the embodiment of the invention also provides a kind of front end wireless transmitting device 301 simultaneously, comprising:
Front end wireless transmitting unit 302 is used for sending a plurality of alerting signals that are in different frequency range when alert takes place.
Preferably, referring to Fig. 3, front end wireless transmitting device 301 also can comprise and is used to control the sending controling unit 303 that front end wireless transmitting unit 302 sends the time interval of alerting signals.
Corresponding with above-mentioned wireless security alarm system, referring to Fig. 4, the embodiment of the invention also provides a kind of radio receiver 401 simultaneously, comprising:
Radio receiving unit 402 is used to receive alerting signal, and carries out corresponding alert according to described alerting signal and handle;
Caution unit 403 is used for when the alerting signal of all frequency ranges all is interfered, and malicious interference takes place in caution.
Corresponding with above-mentioned wireless security alarm system, the embodiment of the invention also provides a kind of wireless security alarm method based on above-mentioned wireless security alarm system, and referring to Fig. 5, this method comprises the steps: at least
S51, front end wireless transmitting unit send a plurality of alerting signals that are in different frequency range to radio receiving unit when alert takes place;
The alerting signal that S52, radio receiving unit receiving front-end wireless transmitting unit send, and carry out corresponding alert according to described alerting signal and handle.
Preferably, said method also can comprise the steps:
Control the time interval that described front end wireless transmitting unit sends alerting signal.
Preferably, said method also can comprise the steps:
When the alerting signal of all frequency ranges all was interfered, malicious interference took place in caution.
Need to prove, more than front end wireless transmitting unit/equipment is sent among all embodiment alerting signal can select different modulation systems as required, mix as ASK/OOK/FSK/GFSK etc. or multiple modulation system and use.And can select fixedly frequency or FHSS mode that alerting signal is received and dispatched, certainly, also fixedly frequency and FHSS mode are mixed use; Can select a kind of coded system (as fixed code, study sign indicating number, rolling code or other specific coding) also can multiple coded system mix use between front end wireless transmitting unit/equipment and the radio receiving unit/equipment.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the embodiment disclosed method, because it is corresponding with the disclosed system of embodiment, so description is fairly simple, relevant part gets final product referring to the components of system as directed explanation.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. a wireless security alarm system is characterized in that, comprising:
The front end wireless transmitting unit is used for sending a plurality of alerting signals that are in different frequency range when alert takes place;
Radio receiving unit is used to receive the alerting signal that described front end wireless transmitting unit sends, and carries out corresponding alert according to described alerting signal and handle.
2. the system as claimed in claim 1 is characterized in that, described system also comprises:
Sending controling unit is used to control the time interval that described front end wireless transmitting unit sends alerting signal.
3. system as claimed in claim 1 or 2 is characterized in that, also comprises:
The caution unit is used for when the alerting signal of all frequency ranges all is interfered, and malicious interference takes place in caution.
4. a front end wireless transmitting device is characterized in that, comprising:
The front end wireless transmitting unit is used for sending a plurality of alerting signals that are in different frequency range when alert takes place.
5. equipment as claimed in claim 4 is characterized in that, also comprises:
Sending controling unit is used to control the time interval that described front end wireless transmitting unit sends alerting signal.
6. a radio receiver is characterized in that, comprising:
Radio receiving unit is used to receive alerting signal, and carries out corresponding alert according to described alerting signal and handle;
The caution unit is used for when the alerting signal of all frequency ranges all is interfered, and malicious interference takes place in caution.
7. the wireless security alarm method based on wireless security alarm system is characterized in that described wireless security alarm system comprises front end wireless transmitting unit and radio receiving unit, and described method comprises:
Described front end wireless transmitting unit sends a plurality of alerting signals that are in different frequency range to described radio receiving unit when alert takes place;
Described radio receiving unit receives the alerting signal that described front end wireless transmitting unit sends, and carries out corresponding alert according to described alerting signal and handle.
8. method as claimed in claim 7 is characterized in that, also comprises:
Control the time interval that described front end wireless transmitting unit sends alerting signal.
9. as claim 7 or 8 described methods, it is characterized in that, also comprise:
When the alerting signal of all frequency ranges all was interfered, malicious interference took place in caution.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910261716A CN101840624A (en) | 2009-12-28 | 2009-12-28 | Wireless security alarm system, device and method |
| PCT/CN2010/070964 WO2011079551A1 (en) | 2009-12-28 | 2010-03-10 | System, device and method for wireless security alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910261716A CN101840624A (en) | 2009-12-28 | 2009-12-28 | Wireless security alarm system, device and method |
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| CN101840624A true CN101840624A (en) | 2010-09-22 |
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| CN200910261716A Pending CN101840624A (en) | 2009-12-28 | 2009-12-28 | Wireless security alarm system, device and method |
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| CN (1) | CN101840624A (en) |
| WO (1) | WO2011079551A1 (en) |
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| CN101965040A (en) * | 2010-10-27 | 2011-02-02 | 深圳市嘉易安安防科技有限公司 | Back end equipment, wireless communication system and method |
| CN101977074A (en) * | 2010-10-27 | 2011-02-16 | 深圳市嘉易安安防科技有限公司 | Back-end equipment as well as wireless communication system and method |
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- 2009-12-28 CN CN200910261716A patent/CN101840624A/en active Pending
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- 2010-03-10 WO PCT/CN2010/070964 patent/WO2011079551A1/en active Application Filing
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| CN101965040A (en) * | 2010-10-27 | 2011-02-02 | 深圳市嘉易安安防科技有限公司 | Back end equipment, wireless communication system and method |
| CN101977074A (en) * | 2010-10-27 | 2011-02-16 | 深圳市嘉易安安防科技有限公司 | Back-end equipment as well as wireless communication system and method |
| CN101965040B (en) * | 2010-10-27 | 2014-09-17 | 深圳市嘉易安安防科技有限公司 | Back end equipment, wireless communication system and method |
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| CN110045358B (en) * | 2019-03-22 | 2022-06-21 | 深圳迈睿智能科技有限公司 | Microwave detector based on Doppler effect principle and anti-radiation interference method |
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| Publication number | Publication date |
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| WO2011079551A1 (en) | 2011-07-07 |
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