Close paragraph of time, signal of business of operation of some landlord the city zone base the station suffers serious interference, cause 300 many base station, the user of more than 50 thousand is affected. The investigation that monitors a station according to radio affirms interference source comes from share electric bicycle, it is to share electric bicycle to add the RFID of outfit to jockey the disaster that label causes, and what terminal of this area RFID chooses is ultrahigh frequency, its frequency paragraph 900M as it happens and operation frequency of business radical station paragraph be identical, caused serious effect and loss.

Why can ultrahigh frequency RFID bring so serious effect? We know, RFID technology attributes skill of communication of radio near field, can realize the intelligence that shares electric car to solve lock, essence to allow fixed position and standard to return the function such as the car through it, but why can it disturb operation does business radical stand? Original, RFID works according to differring frequency, cent is a lot of kinds of types, among them high frequency with ultrahigh frequency it is 2 kinds of technologies with the widest application, and be being used at sharing electric car to jockey to manage somewhere was to use ultrahigh frequency RFID, the actor defect of these 2 kinds of technologies and applied setting are below:

1: Use frequency paragraph different, interference is using frequency paragraph, can serious effect is using frequency paragraph signal

High frequency: Frequency Duan Fan is surrounded for 13.56MHZ

Ultrahigh frequency: Frequency Duan Fan surrounds 902Mhz ~ 928Mhz. The 900MHz that with operation business 4G communication radical stands (Band8) on line frequency paragraph have jackknife: 904-915MHz. The word of a large number of laid will disturb the signal of operation business, for instance the near future some area appeared to disturb operation business 4G in great quantities the serious problem that communication radical stands, the signal that should share electric bicycle operation to because ultrahigh frequency jockeys,just bring about occurrence bedding face to accumulate breaks down, thed loss outweights the gain.

2: Interference rejection ability, ultrahigh frequency is disturbed more easily, high frequency stabler

High frequency RFID and ultrahigh frequency RFID are to belong to program of technology of communication of radio near field. Technology of high frequency RFID is principle of coupling of near field induction, technology of ultrahigh frequency RFID is principle of radiate of far field electromagnetism, but in the space that lives in us, put in all sorts of radio wave, among them the RFID frequency of ultrahigh frequency paragraph the frequency that with us the mobile phone corresponds paragraph very adjacent, be disturbed more easily, if use label of ultrahigh frequency RFID to be used at sharing electric bicycle standard to jockey, disturb operation not only business radical stands, oneself can be disturbed by other communication place as much, when interference can bring about an user badly to return a vehicle, still do not go up.

3: Receive water signal performance, ultrahigh frequency encounters water attenuation, penetrate not easily, high frequency signal is penetrable stronger

The wavelengh of high frequency signal is longer, penetrable capability is stronger, encounter water to penetrate more easily; What ultrahigh frequency encounters water signal attenuation is very fast, reduced broadcast distance greatly, to enlarge sweep range, will increase emissive power, cause interference periphery extremely easily the circumstance that communication radical stands. Leaving the case of seeper of wet road surface, ultrahigh frequency is a board brick almost, without good, bring about share electric car to still do not get on a car.

4: Security demand, ultrahigh frequency does not suit security taller setting, insecure

High frequency: The setting with security higher demand, more be used to be in NFC is not had feeling pay an industry, ultrahigh frequency does not suit the setting with higher security, share electric bicycle to serve as the child that shares economy, want to assure the privacy security of the user likewise, for instance public transportation, subway brushs card to pay why to to use ultrahigh frequency, because security is too poor,be, do not suit the setting with higher security.

5: Working limits: Ultrahigh frequency range is bigger, high frequency scope is less, jockey more accurate.

Because technology of high frequency RFID gets the influence of magnetic field attenuation, its work limits is lesser, be in commonly 30 centimeters of less than, can satisfy share electric car essence to allow park to ask; Because technology of ultrahigh frequency RFID gets the influence of electromagnetic wave attenuation, its work limits is bigger, be in commonly 1 meter of above. To sharing the presence is larger error for the park of electric motor-car, do not agree with the demand that shares electric bicycle standardization to standardize park.

6: Apply setting: Ultrahigh frequency is unwell at complex, confidential setting, high frequency the complex environment that fits ave lane more

High frequency agree with to identify accurately, the setting with safe and confidential, complex environment; Ultrahigh frequency agrees with the setting with extensive management, simple environment. Basic to sharing the setting of electric motor-car it is in the city each are street, the environment is complex, want to be able to ensure the car below different and complex environment can essence of life identifies definitely, fast park; Share information content of electric bicycle user at the same time big, the information that must want to safe confidential means will ensure an user is safe.

Pass above environment and technical analysis, we can reach: Label of ultrahigh frequency RFID is not to suit to apply in share electric bicycle standard to jockey those who go up, its are met as interference signal source serious interference is circumjacent and normal base station signal, be disturbed more easily also at the same time, in urban road, reach the complex environment such as weather to fall, meeting influence shares sex of its signal attenuation electric bicycle is in the efficiency returning a vehicle of complex environment, occurrence bedding face is accumulated cannot return vehicle case, it is last bits to share electric bicycle to compare big service tool as user information content, the information that must want to safe confidential means will ensure an user is safe, when because this serves as the operation business that shares electric bicycle to be in,choice RFID standard jockeys, must do very comparative work, fasten again by flicker.