CN1801660A - Communication device and distance calculation system - Google Patents

Communication device and distance calculation system Download PDF

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Publication number
CN1801660A
CN1801660A CNA2005101140448A CN200510114044A CN1801660A CN 1801660 A CN1801660 A CN 1801660A CN A2005101140448 A CNA2005101140448 A CN A2005101140448A CN 200510114044 A CN200510114044 A CN 200510114044A CN 1801660 A CN1801660 A CN 1801660A
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China
Prior art keywords
signal
distance
communicator
distance operation
portable equipment
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CNA2005101140448A
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Chinese (zh)
Inventor
石村静
池谷昭
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Publication of CN1801660A publication Critical patent/CN1801660A/en
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Abstract

A communication device (e.g., an vehicle-mounted device) comprises a transmitter that transmits a distance-calculation signal with which to calculate a distance to a partner communication device (e.g., a mobile device), a detector that receives the distance-calculation signal returned from the partner communication device and detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received, and a calculator that calculates the distance to the partner communication device based on the phase difference detected by the detector.

Description

Communicator, distance calculation system
Technical field
The present invention relates to communicator, distance calculation system.
Background technology
In recent years, as the communicator that communicates each other for the processing that puts rules into practice, the mobile unit and the portable equipment that have loaded in the automobile that passive keyless enters system (passive keyless entry system) are for example arranged.
Below, describe communicating by letter of the mobile unit loaded in the automobile that passive keyless enters system and portable equipment in detail.Mobile unit for example is arranged on the door of driver's seat side of automobile, and portable equipment is held by the owner of this automobile (below, be called the carrier).And the carrier opens the door and walks out outside car after stopping the engine of automobile.
But mobile unit sends and to be used to judge the signal that whether has portable equipment in the communication range (zone) of mobile unit and portable equipment (below, be called signal A).When but the carrier was in communication range, portable equipment received the signal A from mobile unit, and sent the signal B corresponding to this signal A.If mobile unit receives the signal B from portable equipment, portable equipment is arranged in communication range but then be judged as.In addition, carry out transmission repeatedly with the interval of regulation from the signal A of portable equipment.
Suppose under the situation outside but the carrier goes to communication range that portable equipment can not receive the signal A from mobile unit.Therefore, mobile unit does not receive the signal B corresponding to signal A from portable equipment.Mobile unit is not for example if receive signal B from portable equipment within the predetermined time, then sends the index signal that the door locked that makes this automobile is used to the control part that is arranged on automotive interior in addition.Control part makes the door locked of automobile according to this index signal from mobile unit.Thus, but if the carrier leave automobile, portable equipment is in outside the communication range, then locks the door of automobile.
Then, in case but but go to the outer carrier of communication range and get back in the communication range, then portable equipment receives the signal A from mobile unit once more.And portable equipment sends signal B.If mobile unit has received signal B from portable equipment,, for example send the read output signal that the information of reading portable equipment is used then in order whether to judge portable equipment corresponding to this automobile.Portable equipment sends portable equipment information according to the read output signal from mobile unit.Mobile unit judges that according to the portable equipment information from portable equipment whether portable equipment is corresponding to this automobile.And mobile unit then sends the index signal of the door usefulness of opening this automobile if be judged as portable equipment corresponding to this automobile to described control part.Control part opens the door of automobile according to this index signal from mobile unit.
Like this, enter in the automobile of system having loaded passive keyless, communicate by mobile unit and portable equipment, thereby the key (key) of automobile need not be inserted in the keyhole, just can lock or open the door of this automobile.Open the 2000-198420 communique with reference to the spy.
But, enter in the communicating by letter of the described mobile unit of automobile of system and portable equipment having loaded passive keyless, attack under the situation of (relay attack) carrying out so-called relay, the stolen possibility of this automobile arranged.But so-called this relay attack is meant because of the carrier and has gone out from communication range, original for not carrying out the state of communicating by letter of mobile unit and portable equipment, but make communicating by letter of mobile unit and portable equipment become possibility, thereby the theft means that the door of opening automobile is stolen this automobile by the use trunking.
Below, use Figure 12 to describe relay attack in detail.Figure 12 is that expression is through the mobile unit 101 of trunking A, B and the figure that communicates by letter of portable equipment 102.Mobile unit 101 for example is arranged on the door of driver's seat side, sends described signal A.Mobile unit 101 can carry out signal in the communication range shown in dotted line C transmission receives.Portable equipment 102 behind the signal A that has received from mobile unit 101, sends the signal B corresponding to this signal A as previously mentioned.In addition, portable equipment 102 can carry out the transmission reception of signal in by the communication range shown in the dotted line D.
If but the carrier goes to outside the communication range, then as previously mentioned, do not send the signal B corresponding to signal A from portable equipment 102 to mobile unit 101, the control part (not shown) makes door locked according to the index signal from mobile unit 101.
At this moment, relaying person that will stolen car is called X, Y.Relaying person X holds trunking A and enters in the communication range C of mobile unit 101.In addition, relaying person Y hold trunking B and enter into the carrier near, trunking B is entered in the communication range D of portable equipment 102.Because the trunking A that relaying person X has enters in the communication range C of mobile unit 101, so received signal A, trunking A rectified signal A amplifies the back and sends.Trunking A amplifies by making signal A, thereby can send signal A in than the wide scope of the communication range C of mobile unit 101.The signal A after if the trunking B that has of relaying person Y receives and amplifies by trunking A, the signal A after then trunking B detection should be amplified, and the signal A that decays to the level before for example trunking A amplifies sends.At this moment, owing to trunking B enters in the communication range D of portable equipment 102, so portable equipment 102 receives by the signal A after the trunking B decay.Portable equipment 102 sends signal B corresponding to this signal A and is used as sending equipment from the signal A of mobile unit 101.If trunking B receives signal B, then trunking B rectified signal B amplifies the back and sends.Trunking B amplifies by making signal B, thereby can send signal B in than the also wide scope of the communication range D of portable equipment 102.If trunking A receives by the signal B after the trunking B amplification, the signal B after then trunking A detection should be amplified, the signal B that decays to the level before for example trunking B amplifies sends.At this moment, as previously mentioned, owing to trunking A enters in the communication range C of mobile unit 101, so mobile unit 101 receives by the signal B after the trunking A decay.Therefore, mobile unit 101 is in the communication range but be judged as portable equipment 102 by receiving the signal B corresponding to signal A.And mobile unit 101 makes the door of automobile open the described processing of usefulness.And for example relaying person X enters into the automobile of unlatching (release), steals this automobile.
Like this, in the communicating by letter of mobile unit 101 that inserts trunking A, B and portable equipment 102, come received signal B through trunking A, B, thereby but can be judged as portable equipment 102 and be in the communication range by making mobile unit 101.Therefore, exist mobile unit 101 to send the index signal that the door make automobile is opened usefulness to control part, but control part no matter the carrier whether in communication range and the possibility of opening door.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of for prevent and the other side's side communicator (for example portable equipment) between the party beyond the illegal communication that the people carried out, and can calculate communicator with the distance of the other side's side communicator reliably.In addition, purpose be to provide a kind of for prevent and the other side's side communicator (for example mobile unit) between the party beyond the illegal communication that the people carried out, and can calculate communicator with the distance of the other side's side communicator reliably.There is a purpose to be to provide a kind of in order to prevent the illegal communication that the people carried out beyond the party between first communicator (for example mobile unit) and the second communication device (for example portable equipment) again, and can calculates the distance calculation system of the distance between first communicator and the second communication device reliably.
As being used to address the above problem and the invention of other problems, communicator comprises: sending part, its transmission be used for calculating and the other side's side communicator (for example portable equipment) between the distance operation signal of distance; Test section, it is by receiving the described distance operation signal that returns from described the other side's side communicator, thus this distance operation during with signal and reception of this distance operation when sending detects with the phase difference of signal; Operational part, it is according to by the detected described phase difference of described test section, the distance between computing and the described the other side's side communicator.
In addition, communicator, it can communicate with the other side's side communicator (for example mobile unit), described the other side's side communicator sends the distance operation signal that is used for the computing distance, the described distance operation signal that returns by reception, this distance operation during with reception detects with the phase difference of signal thereby this distance operation when sending is with signal, and according to described phase difference calculating and the described distance operation distance with the home position of signal, wherein this communicator comprises the described distance operation that sends from the described the other side's side Department of Communication Force portion that returns with signal that returns.
And then, the distance calculation system of the distance between a kind of computing first communicator (for example mobile unit) and the second communication device (for example portable equipment), wherein said first communicator comprises: sending part, its transmission be used to calculate and described second communication device between the distance operation signal of distance; Test section, it is by receiving the described distance operation signal that returns from described second communication device, thus this distance operation during with signal and reception of this distance operation when sending detects with the phase difference of signal; Operational part, it is according to by the detected described phase difference of described test section, the distance between computing and the described second communication device; Described second communication device comprises the described distance operation that sends from described first communicator portion that returns with signal that returns.
Reach the record of this specification with reference to the accompanying drawings, can clear and definite other features of the present invention.
Description of drawings
In order further fully to understand the present invention and advantage thereof, please with accompanying drawing with reference to the following description.
Fig. 1 is the functional block diagram of one of the integral body formation of expression distance calculation system of the present invention example;
Fig. 2 is the flow chart of one of the work (action) of expression distance calculation system of the present invention example;
Fig. 3 is the flow chart of one of the work of expression distance calculation system of the present invention example;
Fig. 4 is the time diagram of one of the work of expression distance calculation system of the present invention example;
Fig. 5 is that the expression distance is calculated the figure with the variation of signal;
Fig. 6 is the time diagram of one of the work of expression expression distance calculation system of the present invention example;
Fig. 7 is the figure of expression distance operation with the variation of signal;
Fig. 8 is the figure of another example of the integral body formation of expression distance calculation system of the present invention;
Fig. 9 is the flow chart of one of the work of expression distance calculation system of the present invention example;
Figure 10 is the figure of the detection of the portable equipment 2 that carried out of expression mobile unit 1A, 1B, 1C, 1D;
Figure 11 is the figure of one of the display frame of expression monitor 92 example;
Figure 12 is that expression is via the mobile unit 101 of trunking A, B and the figure that communicates by letter of portable equipment 102.
Embodiment
By the record of this specification and accompanying drawing, can know following item at least.
＜＜the 1 execution mode〉〉
The overall structure example of===distance calculation system===
The communicator that constitutes distance calculation system of the present invention is described with reference to Fig. 1.Fig. 1 is the functional block diagram of one of the integral body formation of expression distance calculation system of the present invention example.
In addition, in the present embodiment, with distance calculation system as be used for can be key operated and the device that makes the passive keyless of the door locked of automobile for example or unlatching enter system describe.And distance calculation system is made of mobile unit 1 (first communicator, communicator, the other side's side communicator), portable equipment 2 (second communication device, communicator, the other side's side communicator).In addition, mobile unit 1 for example is arranged on the outer door handle of car of driver's seat side door of automobile, and portable equipment 2 for example is arranged on the key (key) of this automobile.
In addition, in the present embodiment, from mobile unit 1 to the communication of the signal of portable equipment 2, use the carrier wave of low frequency (for example 125kHz).In addition, from portable equipment 2 to the communication of the signal of mobile unit 1, use the carrier wave of high frequency (for example 312MHz).That is, from mobile unit 1 to the communication of portable equipment 2, owing to communicate, so communication speed is slow with the carrier wave of low frequency.On the contrary, from portable equipment 2 to the communication of mobile unit 1, owing to communicate, so communication speed is fast with the carrier wave of high frequency.Using the slow low frequency of communication speed as described later, is to send the time of signal and return the phase difference (also can be the time difference) of signal of the time of this signal through portable equipment 2 because have a mind to produce from mobile unit 1.In addition, from portable equipment 2 under the situation of the communication of mobile unit 1, by using the fast high frequency of communication speed, thereby phase difference therebetween is in a ratio of insignificant degree with the phase difference that produces when the communicating by letter of portable equipment 2 from mobile unit 1.That is, only the phase difference by having a mind to the communication of portable equipment 2 from mobile unit 1 produce is calculated the distance between mobile unit 1 and the portable equipment 2.Therefore, wittingly low frequency is used for, further, high frequency is used for from the communication of portable equipment 2 to mobile unit 1 from the communication of mobile unit 1 to portable equipment 2.
Further, foregoing from mobile unit 1 to the communication of portable equipment 2, (amplitude excursion modulation: signal Amplitude Shift Keying) communicates by having carried out the ASK modulation.This is because send sending part 7 (sending part, the modulation portion that signal is used from mobile unit 1 to portable equipment 2,) and to receive the circuit structure of the demodulation section of using from the signal of mobile unit 1 24 easy, also can send to portable equipment 2 from mobile unit 1 even disturb to a certain degree.In addition, from portable equipment 2 to the communication of mobile unit 1, (frequency shift (FS) modulation: signal Frequency Shift Keying) communicates by having carried out the FSK modulation.This is to be difficult to be subjected to the influence that causes because of noise because carried out the signal of FSK modulation, can reliably send, and can not lose from the information of portable equipment 2 to mobile unit 1.
In addition, from mobile unit 1 under the situation of the communication of portable equipment 2 because by using the carrier wave of above-mentioned low frequency, thus the magnetic field composition that utilizes the cube of electromagnetic intensity and distance to be inversely proportional to, so common communication distance is about 1m.On the other hand, from portable equipment 2 under the situation of the communication of mobile unit 1, by using the carrier wave of above-mentioned high frequency, thereby communication distance is 5～20m usually.Below, but the communication range of mobile unit 1 and portable equipment 2 is called zone (area).
Mobile unit 1 has CPU (Central Processing Unit) 3 (test section, operational part, judging part, generating units), counter 4, timer 5, flash memory 6 (storage part), sending part 7, acceptance division 8 (demodulation section), transmitting antenna 9, reception antenna 10, OSC26 (oscillating circuit: Oscillator).
Sending part 7 comes the signal of ASK modulation from CPU3 by the carrier wave of the frequency of 125kHz.
Transmitting antenna 9 sends by sending part 7 and has carried out signal after the ASK modulation.
Reception antenna 10 receives from the signal after the FSK modulation of portable equipment 2.
Signal after the FSK from portable equipment 2 that acceptance division 8 demodulate reception antennas 10 receive modulates.
CPU3 is set up for unified control mobile unit 1.In flash memory 6, store the routine data that CPU3 carries out processing usefulness described later in advance.In addition, in flash memory 6, store in advance: when CPU3 carries out the processing of door usefulness of opening automobile, and carried out the data after the demodulation by acceptance division 8 and contrast code signal, the personal data of usefulness from portable equipment 2.Further, in flash memory 6, store the encryption decoding program that is used for decoding by the encryption personal data after acceptance division 8 demodulation (for contrast the personal data after the encryption that the flash memory 13 of portable equipment 2 is stored by CPU3 and described personal data) in advance from portable equipment 2.Flash memory 6 constitutes by reading the non-volatile memory device that writes data repeatedly by the electronics deleted data.
Timer 5 comes timing time according to the indication from CPU3.
OSC26 sends to CPU3 with the clock (CLK0) of assigned frequency.
Counter 4 is according to the indication from CPU3, and the rising edge that counting is used to calculate the signal apart from usefulness to portable equipment 2 of the mobile unit 1 that sends to sending part 7 from CPU3 (below be called the distance operation signal) is to for example rising edge from the clock of OSC26.And counter 4 countings are from the rising edge of the clock of OSC26, till using the rising edge of signal by the distance operation of acceptance division 8 demodulation.In addition, come the count value of reset counter 4 according to indication from CPU3.
CPU3 sends described distance operation signal to sending part 7, simultaneously, counter 4 is resetted and begins to count.In addition, CPU3 resets timer 5 and it is picked up counting.CPU3 is if received the distance operation signal from portable equipment 2 that passes through acceptance division 8 demodulation, the then count value of read-out counter 4.CPU3 is that 2 distance is calculated from mobile unit 1 to portable equipment on the basis with this count value.That is, obtain representing from time of distance operation being sent to sending part 7 with signal to through the count value of portable equipment 2 layback computings with the phase difference of two signals till the time of signal, CPU3 can calculate the distance of mobile unit 1 to portable equipment 2.For example, be under the situation of 15.75kHz in frequency from the clock of OSC26, be 250 o'clock in count value through the counter 4 of portable equipment 2 layback computings during with signal, phase difference at this moment is about 15.87 (msec).And 2 the distance from mobile unit 1 to portable equipment when phase difference is about 15.87 (msec) is about 1 (m), but for example also can obtain from experiment.That will obtain from experiment for example is stored in the flash memory 6 as list data in advance corresponding to the range data of count value.CPU3 judges that whether this distance of calculating is less than predetermined distance (for example 1m).And if CPU3 is judged as this distance of calculating less than predetermined distance, the signal (below be called identification signal) that then will be used to make the transducer (inverter) 21 of portable equipment 2 to be made as off position sends to sending part 7.In addition, CPU3 will read the signal used corresponding to the code signal of code signal of storage the flash memory 6 (below be called the coding read output signal) from portable equipment 2 and send to sending part 7.CPU3 sends the code signal from portable equipment 2 by acceptance division 8 demodulation.CPU3 is being judged as from the code signal of portable equipment 2 and is having from the code signal of flash memory 6 under the situation of relation of regulation, send to sending part 7 with reading the signal that described encryption personal data use (below, be called and encrypt the personal data read output signal).CPU3 sends the encryption personal data from portable equipment 2 by acceptance division 8 demodulation.CPU3 carries out the decoding of these encryption personal data according to the encryption decoding program of storage in the flash memory 6.CPU3 is being judged as under decoded personal data and the situation consistent from the personal data of flash memory 6, with which door of confirming opening automobile (for example, one of door of all of automobile or driver's seat) signal of usefulness (below, be called the input validation signal) sends to sending part 7.Send corresponding to input signal to CPU3 from the input validation signal of portable equipment 2 by acceptance division 8 demodulation.CPU3 is according to the input signal from portable equipment 2 by acceptance division 8 demodulation, and the index signal of the door usefulness of opening automobile is sent to the control part (not shown) that is arranged in addition in the automobile.In addition, but CPU3 will judge the signal whether portable equipment 2 use (below be called confirmation signal A in the zone) in communication range send to sending part 7.At this moment, CPU3 resets timer 5 and picks up counting.CPU3 judges whether that within the predetermined time (Fig. 4 t1) sent signal corresponding to confirmation signal A in this zone (below, be called confirmation signal B in the zone) here from portable equipment 2.CPU3 sends confirmation signal B in these zones from portable equipment 2 as if being judged as within the predetermined time, and the index signal that then will lock the door usefulness of automobile sends to described control part.In addition, these functions of CPU3, by the decoded result according to the routine data of reading from described flash memory 6, CPU3 carries out this program and realizes.The program logic array (not shown) of the routine data that the address counter (not shown), decoding that CPU3 has an address of specifying flash memory 6 read from flash memory 6, carry out the arithmetic and logical unit (not shown) of logical operation and temporarily store the register (not shown) etc. of operational data.
Portable equipment 2 has CPU11, input part 12, flash memory 13, demodulation section 24, modulation portion, and 25, reception antenna 18, transmitting antenna 19, transducer 20,21,22, marker 23, timer 27.
Reception antenna 18 has received from the carrying out of mobile unit 1 signal after the ASK modulation.
Demodulation section 24 for example is made of RF16 (Radio Frequency), DET14 (Detector).Demodulation section 24 demodulation from the carrying out of reception antenna 18 signal after the ASK modulation.
Modulation portion, 25 for example are made of RF17, modulator 15.Modulation portion, the carrier wave of the frequency of 25 usefulness 312MHz, the FSK modulation is from the signal of CPU11.In addition, modulation portion, 25 make transducer 21 under the situation of operating state in the indication by CPU11, come FSK to modulate signal from demodulation section 24 with the carrier wave of the frequency of 312MHz.
Transmitting antenna 19 sends by modulation portion, and 25 have carried out the signal after the FSK modulation.
CPU11 is set up for unified control portable equipment 2.In flash memory 13, store the routine data that CPU11 carries out processing usefulness described later in advance.In addition, in flash memory 13, store corresponding to from the coding read output signal of mobile unit 1 and send to the code signal of mobile unit 1 usefulness.Further, in flash memory 13, store according to the encryption personal data that send to mobile unit 1 usefulness from the encryption personal data read output signal of mobile unit 1.Flash memory 13 constitutes by eliminating the non-volatile memory device that data write sense data repeatedly by electronics.
Timer 27 is according to carrying out timing from the index signal of CPU11.
Input part 12 is for example imported the index signal of importing based on from carrier's indication.For example, want to open the carrier under the situation of door of driver's seat side, the carrier opens the indication input of the door usefulness of driver's seat side, and will be input to input part 12 based on the index signal that this indication is imported.And input part 12 then makes a for example logical value " 1 " of marker 23 storages if imported this index signal of the door usefulness of opening this driver's seat side.In addition, for example, want the carrier under all situation of opening automobile, the carrier carries out the indication input of all usefulness of opening automobile, and will be input to input part 12 based on the index signal that this indication is imported.And input part 12 then makes for example another logical value " 0 " of marker 23 storages if the index signal of this all door usefulness is opened in input.In addition, in the present embodiment, for example, diverter switch (not shown) is set on key (key), wants to open the carrier under the situation of door of driver's seat side, switch this diverter switch to side's side, under the situation of all of wanting opening automobile, switch this diverter switch to opposite side.And, in input part 12 by this diverter switch is switched to a side, and the index signal of the door usefulness of driver's cabin side is opened in input, the situation that input part 12 makes marker 23 store " 1 " describes.In addition, to import the index signal of opening all door usefulness by this diverter switch being switched to opposite side in input part 12, input part 12 describes the situation of marker 23 storages " 0 ".
CPU11 sends the interior confirmation signal A in the zone from mobile unit 1 by demodulation section 24 demodulation, and to modulation portion, confirmation signal B in 25 sending zones.At this moment, CPU11 resets timer 27 to pick up counting.CPU11 judges whether (Fig. 4 t2) sends confirmation signal A in the zone from mobile unit 1 once more within the predetermined time.CPU11 then is made as operating state with transducer 21 if be not judged as not within the predetermined time confirmation signal A in the sending zone.Therefore, can still pass through modulation portion, 25 carry out the FSK modulation, and send from transmitting antenna 19, and the signal from mobile unit 1 that carries out demodulation by demodulation section 24 are not carried out any processing.CPU11 sends the identification signal from mobile unit 1 by demodulation section 24 demodulation, has sent this identification signal if be judged as, and then transducer 21 is made as off position.CPU11 sends the coding read output signal from mobile unit 1 by demodulation section 24 demodulation, has sent this coding read output signal if be judged as, and then reads code signal from flash memory 13, and sends to modulation portion, 25.CPU11 sends the encryption personal data read output signal from mobile unit 1 by demodulation section 24 demodulation, has sent this personal data read output signal if be judged as, and then reads the encryption personal data from flash memory 13, and sends to modulation portion, 25.CPU11 send by demodulation section 24 demodulation from mobile unit 1 input validation signal.CPU11 is according to this input validation signal, and at this moment the information of " 1 " or " 0 " of storage in marker 23 is sent to modulation portion as input signal, 25.In addition, these functions of CPU11 are carried out this program by decoded result, CPU11 according to the routine data read and are realized from described flash memory 13.The program logic array (not shown) of the routine data that the address counter (not shown), decoding that CPU11 has an address of specifying flash memory 13 read from flash memory 13, carry out the arithmetic and logical unit (not shown) of logical operation and temporarily store the register (not shown) etc. of operational data.
The work of=distance calculation system (not carrying out under the situation of relay attack)=
The work of distance calculation system of the present invention is described referring to figs. 1 through Fig. 5.Fig. 2, Fig. 3 are the flow charts of one of the work of expression distance calculation system of the present invention example.Fig. 4 is the time diagram of one of the work of expression distance calculation system of the present invention example.Fig. 5 is the figure of expression distance operation with the variation of signal.In addition, in Fig. 4, send the signal of being put down in writing in the left hurdle during expression high level.In fact, the signal that sends to portable equipment 2 from mobile unit 1 is the signal that has carried out the ASK modulation by sending part 7, is by modulation portion from portable equipment 2 to the signal that mobile unit 1 sends, and 25 have carried out the signal of FSK modulation.In addition, left hurdle mobile unit 1 distance operation among Fig. 4 for convenience of description, describes as the waveform of the left hurdle distance operation in the presentation graphs 5 with signal (transmission) with a high level of signal.And then, in Fig. 4,, represent with identical square wave only for convenience though all be identical square wave (for example portable equipment 2 code signals), be not defined in this.For example, portable equipment 2 code signals can be made as the code signal that has corresponding to as the coded message during the high level.Thus, can more effectively send coded message.
In addition, in the present embodiment, illustrate that the carrier stops the engine of automobile, hold portable equipment 2 and walk out automobile and close situation to the doorstep.In addition, the transducer 21 of portable equipment 2 is an off position.
Be arranged on the control part (not shown) in the automobile in addition, receive the signal of the door of getting on the car based on the pass.Control part will begin passive keyless according to this signal and enter the signal that system uses and send to CPU3.And, beginning after this passive keyless enters the signal that system uses having received, CPU3 is confirmation signal A (S101) in sending part 7 sending zones.At this moment, the CPU3 timer 5 that resets.Timer 5 after resetting picks up counting.And, CPU3 judge whether in preset time (t1), to send here by acceptance division 8 demodulation from confirmation signal B (S102) in the zone of portable equipment 2.Sending part 7 comes ASK to modulate confirmation signal A in this zone by the carrier wave of the frequency of 125kHz.And, confirmation signal A in transmitting antenna 9 sends zone carried out the ASK modulation by sending part 7 after (Fig. 4 mobile unit 1 regional in confirmation signal A).
Confirmation signal A in the zone after if the reception antenna of portable equipment 2 18 reception ASK modulate, the then regional interior confirmation signal A after the demodulation section 24 demodulation ASK modulation.And CPU11 then sends to modulation portion with confirmation signal B in the zone, 25 (S202) if be judged as the regional interior confirmation signal A (S201 is) that has sent by after demodulation section 24 demodulation.At this moment, the CPU11 timer 27 that resets.Timer 27 after resetting picks up counting.And CPU11 judges whether at the fixed time to send here once more in (t2) the interior confirmation signal A (S201) in the zone from mobile unit 1 by after demodulation section 24 demodulation.Modulation portion, 25 the carrier waves of frequency by 312MHz come the FSK modulation from confirmation signal B in the zone of CPU11.Send by modulation portion confirmation signal B in 25 zones of carrying out after the FSK modulation (confirmation signal B in Fig. 4 portable equipment 2 zones) through transmitting antenna 19.
Confirmation signal B in the zone after if the reception antenna of mobile unit 1 10 reception FSK modulate, the then regional interior confirmation signal B after the acceptance division 8 demodulation FSK modulation.CPU3 then sends to sending part 7 (S101) with confirmation signal A in the zone once more if be judged as the interior confirmation signal B (S102 is) in the zone from portable equipment 2 that has sent by acceptance division 8 demodulation.
Like this, but if the carrier enters into portable equipment 2 can be received from the communication range of confirmation signal A in the zone of mobile unit 1, then mobile unit 1 can receive from confirmation signal B (in Fig. 4 zone) in the zone of portable equipment 2.Therefore, whether nearby mobile unit 1 can judge carrier's (that is, but communication range in).
Then, but illustrate that the carrier walks out the situation of aforementioned communication range (outside Fig. 4 zone).
If but the carrier walks out communication range, then portable equipment 2 can not receive from confirmation signal A in the zone of mobile unit 1, therefore, will not send to mobile unit 1 from confirmation signal B in the zone of portable equipment 2.CPU3 is if be judged as in the sending zone behind the confirmation signal 1, even passed through preset time (t1), also do not send confirmation signal B in the zone of portable equipment 2 (S102 is not), the index signal that then will lock the door usefulness of automobile sends to above-mentioned control (S103.Fig. 4 closes door) portion.In addition, under this situation, also can be set to CPU3 confirmation signal A in the zone many times (for example twice) is sent to sending part 7 (with reference to Fig. 4).And any in for this zone repeatedly among the confirmation signal A once sends, and CPU3 is judged as not under the situation of confirmation signal B in portable equipment 2 sending zones, also the index signal that locks the door usefulness of automobile can be sent to control part.Thus, but CPU3 can judge more reliably that the carrier is not in communication range.Further, but temporarily go to outside the communication range the carrier, but and get back under the situation in the communication range at once, do not carry out processing that lock door uses with regard to the passable possibility that becomes.Therefore, do not need to open the required time of processing of a usefulness, can eliminate and open the door required time delay of this processing before.In addition, CPU3 as previously mentioned, if be judged as in the sending zone behind the confirmation signal 1, even passed through preset time (t1), do not send confirmation signal B (S102 deny) in the zone of portable equipment 2 yet, then distance operation is sent to sending part 7 (S104) with signal (Fig. 5 distance operation with signal (transmission)).At this moment, CPU3 resets counter 4, and makes counter 4 begin to count from the rising edge of this distance operation with signal.Further, CPU3 resets timer 5 and picks up counting.And CPU3 judges whether to have returned this distance operation signal (S105) from portable equipment 2 in preset time (t3).The carrier wave of the frequency of sending part 7 usefulness 125kHz comes ASK to modulate this distance operation signal (Fig. 5 ASK).And, send distance operation carry out the ASK modulation by sending part 7 after with signal (Fig. 4 mobile unit 1 distance operation signal) through transmitting antenna 9.At this moment, CPU3 does not return the distance operation signal by acceptance division 8 demodulation if be judged as after the transmission range computing is with signal in described preset time (t3), then transmission range computing signal once more.In addition, as previously mentioned, timer 5 is started pick up counting, and counter 4 is resetted begin counting.In addition, this distance operation is not limited to waveform shown in Figure 5 (distance operation signal (transmission)) with signal.In order to improve fail safe, for example also can change content (that is, the expression distance operation wave form varies of signal) from each signal of CPU3 transmission, make the content change of signal at regular intervals.
Like this, but if the carrier walks out from receiving from the communication range of the interior confirmation signal A in zone of mobile unit 1, all locked of automobile then.
(t2) do not have confirmation signal A in the sending zone to CPU11 during predetermined if be judged as, and then makes transducer 21 be operating state (S203, Fig. 4 transducer 21).
Then, but the carrier turned back to situation in the communication range (in the zone on Fig. 4 the right) describe.
If but the carrier turns back in the communication range, then the reception antenna 18 of portable equipment 2 receives the distance operation signal that the ASK from mobile unit 1 modulated.The distance operation that 24 couples of ASK of demodulation section modulated carries out demodulation with signal.At this moment, because transducer 21 becomes operating state, so be sent straight to modulation portion by the distance operation from mobile unit 1 of demodulation section 24 demodulation with signal, 25 (S205).Modulation portion, the carrier wave of the frequency of 205 usefulness 312MHz carries out FSK modulation (Fig. 5 FSK) to the distance operation from demodulation section 24 with signal.Send by modulation portion through transmitting antenna 19,25 carried out the distance operation signal (Fig. 4 portable equipment 2 distance operation signals) of FSK modulation.
As if the distance operation signal after the reception antenna 10 reception FSK modulation of mobile unit 1, then the distance operation signal after the acceptance division 8 demodulation FSK modulation (Fig. 5 distance operation signal (reception)).If be judged as sent by acceptance division 8 demodulation from the distance operation of portable equipment 2 with signal (S105 is), the then count value of CPU3 read-out counter 4.And,, calculate the distance (S106) of mobile unit 1 to portable equipment 2 according to this count value.In addition, as previously mentioned, in the communication of portable equipment 2, use carrier wave as the 125kHz of low frequency at mobile unit 1.In addition, in the communication of mobile unit 1, use carrier wave at portable equipment 2 as the 312MHz of high frequency.Thus, the phase difference that the phase difference from portable equipment 2 to mobile unit 1 the communication and mobile unit 1 produce during to the communication of portable equipment 2 is compared, and is insignificant degree.Therefore, the distance operation that sends to sending part 7 from CPU3 is used signal and by the distance operation signal after acceptance division 8 demodulation, is had a mind to produce phase difference T1 (Fig. 5) by the low frequency signal that uses 125kHz.Thus, described CPU3 this count value of reading is represented this phase difference T1.And CPU3 reads the distance corresponding to this count value of obtaining of storing as list data in flash memory 6 from experiment.Thus, CPU3 can use this count value of this phase difference of expression T1, calculates the distance of mobile unit 1 to portable equipment 2.And CPU3 judges whether portable equipment 2 does not surpass predetermined distance (for example 1m) (S108) apart from mobile unit 1.In addition, in the present embodiment, though judge from mobile unit 1 to portable equipment that according to the count value of counter 4 whether 2 distance surpasses preset distance, is not limited thereto.For example, CPU3 makes distance operation make timer 5 timing with signal when CPU3 sends to sending part 7, reads the time that has sent by 5 timing of timer during with signal from the distance operation of portable equipment 2 of acceptance division 8 demodulation.And, this time of using 5 timing of timer, can judge also from mobile unit 1 to portable equipment whether 2 distance surpasses preset distance.In addition, the judgement of 2 distance from mobile unit 1 to portable equipment that CPU3 carries out is not defined in 1 time yet.For example also can be to carry out repeatedly (being 3 times) judgement of 2 distance from mobile unit 1 to portable equipment in Fig. 4, all be judged as this distance and surpass under the situation of preset distance in all judgements, CPU3 enters ensuing processing.Like this, can more properly judge from mobile unit 1 to portable equipment 2 distance.Surpass preset distance (S108 is) if CPU3 is judged as 2 the distance of being calculated from mobile unit 1 to portable equipment, then send identification signals (S109) to sending part 7.The carrier wave of the frequency of sending part 7 usefulness 125kHz carries out the ASK modulation to this identification signal.And, send the identification signal (Fig. 4 mobile unit 1 identification signal) of modulating from the ASK of sending part 7 through transmitting antenna 19.
If the reception antenna of portable equipment 2 18 receives the identification signal after the ASK modulation, the identification signal after then demodulation section 24 demodulation ASK modulate.CPU11 has sent by the identification signal from mobile unit 1 after demodulation section 24 demodulation (S206 is) as if being judged as, and then makes transducer 21 be off position (Figure 20 7 Fig. 4 transducers 21).
Then, the CPU3 of mobile unit 1 sends coding read output signal (S110) to sending part 7.And CPU3 judges whether to send here the code signal from portable equipment 2 (S111) by acceptance division 8 demodulation.The carrier wave of the frequency of sending part 7 usefulness 125kHz comes ASK to modulate this coding read output signal.And, the coding read output signal after transmitting antenna 9 has sent from the carrying out of sending part 7 the ASK modulation (Fig. 4 mobile unit 1 coding read output signal).
If the reception antenna of portable equipment 2 18 receives the coding read output signal after the ASK modulation, the coding read output signal after then demodulation section 24 demodulation ASK modulate.CPU11 then reads code signal if be judged as the coding read output signal (S208 is) from mobile unit 1 that has sent by demodulation section 24 demodulation from flash memory 13.And CPU11 sends this code signal (S209) to modulator 25.Modulation portion, the carrier wave of the frequency of 25 usefulness 312MHz are come the code signal of FSK modulation from CPU11.Send by modulation portion through transmitting antenna 19,25 have carried out the code signal (Fig. 4 portable equipment 2 code signals) after the FSK modulation.
If the reception antenna of mobile unit 1 10 receives the code signal after the FSK modulation, the code signal after then acceptance division 8 demodulation FSK modulate.CPU3 is if be judged as the code signal from portable equipment 2 (S111 is) that has sent by acceptance division 8 demodulation, in order to contrast with code signal from portable equipment 2, and reads code signal from flash memory 6.And CPU3 judges from the code signal of portable equipment 2 and the relation (S112) whether regulation is arranged from the code signal of flash memory 6.And, if CPU3 is judged as from the code signal of portable equipment 2 and the relation (S112 is) that has regulation from the code signal of flash memory 6, then will encrypts the personal data read output signal and send to sending part 7 (S113).And CPU3 judges whether to send here the encryption personal data (S114) from portable equipment 2 by acceptance division 8 demodulation.The carrier wave of the frequency of sending part 7 usefulness 125kHz comes ASK to modulate this encryption personal data read output signal.And, the encryption personal data read output signal through the ASK modulation has been carried out in transmitting antenna 9 transmissions by sending part 7 after (Fig. 4 mobile unit 1 is encrypted the personal data read output signal).
If the reception antenna of portable equipment 2 18 receives the encryption personal data after the ASK modulation, the encryption personal data read output signal after then demodulation section 24 demodulation ASK modulate.CPU11 then reads the encryption personal data if be judged as the encryption personal data read output signal (S210 is) that has sent by demodulation section 24 demodulation from flash memory 13.And CPU11 sends this to modulator 25 and encrypts personal data (S211).Modulation portion, the carrier wave of the frequency of 25 usefulness 312MHz are come the encryption personal data of FSK modulation from CPU11.Send by modulation portion through transmitting antenna 19,25 have carried out the encryption personal data (Fig. 4 portable equipment 2 is encrypted personal data) after the FSK modulation.
If the reception antenna of mobile unit 1 10 receives the encryption personal data after the FSK modulation, the encryption personal data after then acceptance division 8 demodulation FSK modulate.CPU3 then according to the encryption decoding program that is stored in the flash memory 6, carries out the decoding (S115) of these encryption personal data if be judged as the encryption personal data (S114 is) from portable equipment 2 that sent by acceptance division 8 demodulation.And,, then read the personal data that are stored in the flash memory 6 if CPU3 finishes the decoding (below, decoded encryption personal data are called decoding back personal data) from the encryption personal data of portable equipment 2.CPU3 judge decoding back personal data with from the personal data of flash memory 6 whether consistent (S116).CPU3 if be judged as decoding back personal data with from the personal data of flash memory 6 consistent (S116 is), then the input validation signal is sent to sending part 7 (S117).And CPU3 judges whether to send here the input signal from portable equipment 2 (S118) by acceptance division 8 demodulation.The carrier wave of the frequency of sending part 7 usefulness 125kHz comes ASK to modulate this input validation signal.And, the input validation signal (Fig. 4 mobile unit 1 input validation signal) after transmitting antenna 9 has sent from the carrying out of sending part 7 the ASK modulation.
If the reception antenna of portable equipment 2 18 receives the input validation signal after the ASK modulation, the input validation signal after then demodulation section 24 demodulation ASK modulate.CPU11 then reads the information that is stored in the marker 23 if be judged as the input validation signal (S212 is) that has sent by demodulation section 24 demodulation.Canned data is meant as previously mentioned in the so-called marker 23 at this moment, want to open the carrier under the situation of door of driver's seat side, be that the carrier passes through diverter switch (not shown) is switched to a side and to input part 12 input indicative signals, input part 12 is according to this index signal institute's canned data " 1 " in marker 23.Perhaps, as previously mentioned, want the carrier to be meant the carrier by the diverter switch (not shown) is switched to opposite side and index signal is input to input part 12 under all situation of opening automobile, input part 12 is according to this index signal canned data " 0 " in marker 23.In the present embodiment, the following describes and stored for example situation of " 1 " in the marker 23.CPU11 will send to modulation portion corresponding to the input signal that is stored in " 1 " in the marker 23,25 (S213).Modulation portion, the carrier wave of the frequency of 25 usefulness 312MHz are come the input signal of FSK modulation from CPU11.Send by modulation portion through transmitting antenna 19,25 have carried out the input signal (Fig. 4 portable equipment 2 input signals) after the FSK modulation.
If the reception antenna of mobile unit 1 10 receives the input signal after the FSK modulation, the input signal after then acceptance division 8 demodulation FSK modulate.CPU3 is if be judged as the input signal from portable equipment 2 (S118 is) that has sent by acceptance division 8 demodulation, judges that then whether this input signal is the input signal (S119) corresponding to " 1 ".And CPU3 is if being judged as this input signal is input signal (S119 is) corresponding to " 1 ", then in order only to open the door of driver's seat side, and sends index signal (S120) to described control part (not shown).In addition, CPU3 is not if being judged as input signal is input signal (S119 not) corresponding to " 1 ", then for all doors of opening automobile, and index signal sent to control part (S121).
Like this, but portable equipment 2 is arranged in communication range, and from CPU3 to distance operation that sending part 7 sends with signal with by calculating the distance of mobile unit 1 from the distance operation of portable equipment 2 with signal after acceptance division 8 demodulation to portable equipment 2, do not have to surpass predetermined distance if be judged as this distance, then come all doors of opening automobile or the door of driver's seat by control part.
The work of=distance calculation system (carrying out the situation of relay attack)=
With reference to Fig. 1 and even Fig. 3, Fig. 6, Fig. 7, the work of the distance calculation system of the present invention under the situation of carrying out above-mentioned relay attack is described.Fig. 6 is another routine time diagram of the work of expression distance calculation system of the present invention.Fig. 7 is the figure of expression distance operation with the variation of signal.In addition, Fig. 6 is also same with above-mentioned Fig. 4, for convenience, sends the signal of being put down in writing in the left hurdle during expression high level.In fact, the signal that sends to portable equipment 2 from mobile unit 1 is the signal that has carried out the ASK modulation by sending part 7, is by modulation portion from portable equipment 2 to the signal that mobile unit 1 sends, and 25 have carried out the signal of FSK modulation.In addition, left hurdle mobile unit 1 distance operation among Fig. 6 for convenience of description, describes as the waveform of the left hurdle distance operation in the presentation graphs 7 with signal (transmission) with a high level of signal.In addition,, also stop the engine of automobile from the carrier even in the present embodiment, with portable equipment 2 walk out automobile and close the door scene begin explanation.Have, the transducer 21 that is made as portable equipment 2 is off positions again.
And then, present embodiment describes at the situation that holder (hereinafter referred to as relaying person X) by the trunking A (not shown) in the communication circle that enters mobile unit 1 and the holder (hereinafter referred to as relaying person Y) of the trunking B (not shown) that communicates by letter with above-mentioned trunking A in the encircled energy of communicating by letter of portable equipment 2 carry out relay attack.
But the carrier does not have the situation of relay attack identical with above-mentioned in communication range the time.
If but the carrier walks out communication range, then portable equipment 2 can not receive from confirmation signal A in the zone of mobile unit 1, therefore, will not send to mobile unit 1 from confirmation signal B in the zone of portable equipment 2.Therefore, CPU3 is judged as in the sending zone and behind the confirmation signal A, even passed through preset time (t1), does not also send confirmation signal B in the zone of portable equipment 2 (S102 is not).And, the index signal that locks all usefulness of automobile is sent to the control part (not shown) (S103, Fig. 6 door are closed) that is arranged in addition in the automobile.In addition, as do not carry out also can being set to CPU3 confirmation signal A in the zone many times (for example twice) being sent to sending part 7 (with reference to Fig. 6) as described in the situation of above-mentioned relay attack.In addition, CPU3 sends to sending part 7 with distance operation with signal (Fig. 7 distance operation with signal (transmission)) when sending above-mentioned index signal to control part.At this moment, CPU3 resets counter 4, and makes counter 4 begin to count from the rising edge of this distance operation with signal.Further, CPU3 resets timer 5 and picks up counting.And CPU3 judges whether to have returned this distance operation signal (S105) from portable equipment 2 in preset time (t3).The carrier wave of the frequency of sending part 7 usefulness 125kHz comes ASK to modulate this distance operation signal (Fig. 7 ASK (1)).And, send distance operation carry out the ASK modulation by sending part 7 after with signal (Fig. 6 mobile unit 1 distance operation signal) through transmitting antenna 9.At this moment, CPU3 does not return the distance operation signal by acceptance division 8 demodulation if be judged as after the transmission range computing is with signal in described preset time (t3), then transmission range computing signal once more.In addition, as previously mentioned, make timer 5 restart (resetting) and pick up counting, and counter 4 is resetted begin counting.
Like this, but go out from receiving, then lock the door of automobile from the communication range of confirmation signal A in the zone of mobile unit 1 as if the carrier.
(t2) do not have confirmation signal A in the sending zone to CPU11 during predetermined if be judged as, and then makes transducer 21 be operating state (S203, Fig. 6 transducer 21).
For example, but walk out communication range the carrier, and escape to can not discern automobile apart from the time, relaying person X walks near automobile, trunking A enters in the communication circle of mobile unit 1.In addition, relaying person Y walks near the carrier, and trunking B is entered in the communication circle of portable equipment 2, attempt theft this automobile (carrying out relay attack).
If the trunking A reception of communication circle that is positioned at mobile unit 1 is from the distance operation signal of mobile unit 1, then this distance operation of detection amplifies (Fig. 7 ASK (2)) after with signal.And, trunking A transmission range computing signal ASK (2).At this moment, use the communication distance of signal ASK (2) from the distance operation of relaying device A transmission, compare with the common communication distance of signal ASK (1) with distance operation from mobile unit 1, owing to amplify by trunking A, so can proceed to the communication of farther distance.Have again, below the distance operation of the explanation this moment distance that can receive for trunking B with the communication distance of signal ASK (2).
If trunking B receives the distance operation signal ASK (2) from trunking A, then this distance operation of detection for example decays to the level of the distance operation of mobile unit 1 transmission with signal with signal ASK (2).And trunking B sends the distance operation signal ASK (3) that decayed.
At this moment, as previously mentioned, owing to relaying person Y is positioned near the carrier, thus the communication circle that trunking B is positioned at portable equipment 2 become, so reception antenna 18 receiving range computings signal ASK (3).Demodulation section 24 demodulation distance operations signal ASK (3).At this moment, because transducer 21 is an operating state, so will directly send to modulation portion by the distance operation from trunking B of demodulation section 24 demodulation with signal, 25 (S205).Modulation portion, the carrier wave of the frequency of 25 usefulness 312MHz are come the distance operation signal (Fig. 7 FSK (1)) of FSK adjustment from demodulation section 24.Send by modulation portion through transmitting antenna 19,25 carry out the distance operation signal FSK (1) (Fig. 6 portable equipment 2 distance operation signals) after the FSK modulation.
And, as previously mentioned, owing to have trunking B in the communication circle of portable equipment 2, so the distance operation signal FSK (1) after the trunking B reception FSK modulation from portable equipment 2.Distance operation after the trunking B detection FSK modulation is with signal FSK (1) and amplify (Fig. 7 FSK (2)).And, trunking B transmission range computing signal FSK (2).At this moment, compare with the common communication distance of signal FSK (1) with distance operation with the communication distance of signal FSK (2) from the distance operation that the relaying equipment B sends from portable equipment 2, owing to amplify by trunking B, so can proceed to the communication of farther distance.Have again, below the distance operation of the explanation this moment distance that can receive for trunking A with the communication distance of signal FSK (2).
If trunking A receives the distance operation signal FSK (2) from trunking B, then this distance operation of detection for example decays to the level of the distance operation of portable equipment 2 transmissions with signal with signal FSK (2).And trunking A sends the distance operation signal FSK (3) that decayed.
At this moment, as previously mentioned, because relaying person X is near automobile, so trunking A is present in the communication circle of mobile unit 1 so reception antenna 10 receiving range computings usefulness signal FSK (3).Acceptance division 8 demodulation distance operations signal FSK (3) (Fig. 7 distance operation signal (reception)).CPU3 is judged as and has sent by the distance operation after acceptance division 8 demodulation with signal (S105 is), the then count value of read-out counter 4.And,, calculate the distance (S106) of mobile unit 1 to portable equipment 2 according to this count value.
Operation method for this moment, CPU3 carried out from mobile unit 1 to portable equipment 2 distance does not have the situation of relay attack same with above-mentioned.Yet as mentioned above, trunking A amplifies transmission range computing signal ASK (2) in back to the distance operation that sends from mobile unit 1 with signal ASK (1).At this moment, trunking A must amplify after temporary transient this distance operation of detection is with signal ASK (1) in order to amplify distance operation with signal ASK (1).In addition, as mentioned above, from mobile unit 1 to the communication of portable equipment 2, carry out communicating after the ASK modulation with the carrier wave of the frequency of 125kHz.Therefore, distance operation is compared elongated with the distance operation that sends from portable equipment 2 with signal FSK (1) with the one-period of signal ASK (1).That is, because the long distance operation of the temporary transient detection one-period of trunking A amplifies after with signal ASK (1), so produced phase difference T2 (Fig. 5) with signal ASK (1) and distance operation on signal ASK (2) at distance operation.In addition, even the distance operation in trunking B is used in the decay of signal ASK (3) to distance operation with signal ASK (2), also can produce phase difference T3 for the foregoing reasons.That is, the CPU3 distance operation that sends to sending part 7 with signal (transmission) be T4 (T2+T3) by the distance operation of acceptance division 8 demodulation with the phase difference variable of signal (reception).And the count value of the counter 4 that CPU3 reads is represented this phase difference T4.And CPU3 uses this count value of this phase difference of expression T4 to calculate the distance of mobile unit 1 to portable equipment 2.Represent that CPU3 calculates mobile unit 1 count value apart from the phase difference T4 of usefulness to portable equipment 2 this moment, do not insert trunking A, B with expression and do not have the count value of the phase difference T1 (Fig. 5) under the situation of relay attack to compare, become many values.That is, 2 the distance from mobile unit 1 to portable equipment that CPU3 calculates according to the count value of expression phase difference T4 is compared with the distance of calculating according to the count value of expression phase difference T1, becomes long distance.
And CPU3 judges according to the distance of calculating whether portable equipment 2 does not surpass predetermined distance (S108) apart from mobile unit 1.But, because becoming than above-mentioned, the distance calculated of CPU3 do not have the also long distance of distance calculated under the situation of relay attack, so being judged as, CPU3 surpasses predetermined distance (S108 denys).At this moment, CPU3 judges whether the timing of timer 5 reaches the stipulated time (t4) (S122).
CPU3 is being judged as (S122 is not) under the situation that does not reach stipulated time (t4), once more to sending part 7 transmission range computings signal (Fig. 7 distance operation is used signal (transmission) right side).At this moment, CPU3 makes counter 4 countings, makes counter 4 begin to count from the rising edge of this distance operation with signal.In addition, CPU3 once more to sending part 7 transmission range computing signals be because: make the mobile unit 1 that carries out from CPU3 more accurate to the computing of the distance of portable equipment 2.And, if being judged as not surpass preset distance (S108 is not) but be judged as, CPU3 do not reached the stipulated time (t4) (S122 is), then stop communicating by letter (S123) with portable equipment 2.Have again, in the present embodiment, under CPU3 is judged as situation above preset distance, stop and the communicating by letter of portable equipment 2, but be not limited to this.For example, the alarm portion (not shown) that in portable equipment 2, is provided for giving the alarm.And CPU3 sends to sending part 7 and to be used to alarm signal that this alarm portion is given the alarm under situation about being judged as above preset distance.And, also can be based on to this alarm signal that portable equipment 2 sends alarm portion being given the alarm by trunking A, B.Like this, the carrier can know the relaying, and person X, Y get involved, and can improve the fail safe aspect.
Like this, under the situation of having carried out relay attack, from mobile unit 1 to the communication of portable equipment 2, as mentioned above, get involved, thereby distance operation is big with the phase difference variable of signal by trunking A, trunking B.Therefore, CPU3 surpasses preset distance if be judged as portable equipment 2 apart from mobile unit 1, reaches the stipulated time (t4) in addition, then stops and the communicating by letter of portable equipment 2.Thus, by the relay attack of relaying person X, Y, the door of automobile is not unlocked, and can prevent the stolen of automobile.
In addition, even but the carrier gets back to communication range once more, as previously mentioned, because mobile unit 1 stops and the communicating by letter of portable equipment 2, so do not open door.At this moment, the carrier opens door by key is inserted keyhole.At this moment, control part (not shown) receives based on the signal of opening door by key being inserted into keyhole.Control part sends to CPU3 according to this signal with mobile unit 1 and portable equipment 2 begin the to communicate by letter index signal of usefulness.If CPU3 receives this index signal (S124 is), then begin and the communicating by letter of portable equipment 2.
" the 2nd execution mode "
The integral body formation of=distance calculation system=
With reference to Fig. 8, Figure 10 distance calculation system of the present invention is described.Fig. 8 is the functional block diagram of one of the integral body formation of expression distance calculation system of the present invention example.In addition, in the present embodiment, to 4 the 1st mobile units 1 (1A, 1B, 1C, 1D) in the execution mode are set in automobile, adopt the situation of distance calculation system to describe in the detection of the portable equipment 2 in the somewhere that is arranged in automobile.Therefore, distance calculation system has mobile unit 1A, 1B, 1C, 1D and portable equipment 2.In addition, in Fig. 8, pay identical number and omit explanation with the same parts that constitute of above-mentioned Fig. 1.And then, in Fig. 8, mobile unit 1A, 1B, 1C, 1D be with Fig. 1 in the same formation of mobile unit 1, extra token and omit explanation on identical number for convenience.Figure 10 is the figure of the detection of the portable equipment 2 that carried out of expression mobile unit 1A, 1B, 1C, 1D.In addition, if among Figure 10+directions X is the place ahead direction of automobile, for example then establishes, and mobile unit 1A is arranged on forward direction left side, before mobile unit 1B is arranged on to the right, after mobile unit 1C is arranged on to the left, after mobile unit 1D is arranged on to the right.In addition, CPU90 is arranged on the automotive interior that is provided with mobile unit 1A, 1B, 1C, 1D.Portable equipment 2 is arranged on the key (key) of automobile.
The unified control of CPU90 mobile unit 1A, 1B, 1C, 1D.
Mobile unit 1A has CPU3A), counter 4A, timer 5A, flash memory 6A, sending part 7A, acceptance division 8A, transmitting antenna 9A, reception antenna 10A, OSC26A.
CPU3A is according to from the index signal of CPU90, sends to sending part 7A to be used to confirm the whether signal (confirmation signal A in hereinafter referred to as car) in automobile of portable equipment 2.CPU3A send by acceptance division 8A demodulation from confirmation signal B in the car of portable equipment 2.CPU3A will the signal (hereinafter referred to as confirmation signal) of confirmation signal B sends to CPU90 in the car based on having sent.The CPU3A signal (hereinafter referred to as signal unconfirmed) that confirmation signal B is not sent here in CPU90 sends based on car.In addition, CPU3A is according to from the index signal of CPU90, sends to sending part 7A to be used to make transducer 21 to be the signal of operating state (hereinafter referred to as the transducer index signal of not working).In addition, CPU3A is as described in the 1st execution mode, according to the count value of counter 4A, calculates from mobile unit 1A to portable equipment 2 distance.CPU3A sends 2 the range information from mobile unit 1A to portable equipment calculate to CPU90.
Mobile unit 1B, 1C, 1D constitute the same formation with above-mentioned mobile unit 1A.In addition, mobile unit 1A, 1B, 1C, 1D can also can carry out above-mentioned processing in turn simultaneously according to carrying out above-mentioned processing from the indication of CPU90.
CPU90 is used to make CPU3A, 3B, 3C, 3D to send the index signal of above-mentioned automobile confirmation signal A according to from the index signal that is arranged on the control part (not shown) in the automobile to mobile unit 1A, 1B, 1C, 1D transmission.CPU90 sends the signal (hereinafter referred to as the engine start enabling signal) of the engine start of permission automobile according to the above-mentioned confirmation signal from mobile unit 1A, 1B, 1C, 1D to control part.In addition, CPU90 is according to from the signal above-mentioned unconfirmed of mobile unit 1A, 1B, 1C, 1D, sends the signal (disapproving signal hereinafter referred to as engine start) of the engine start that is used to disapprove automobile to control part.CPU90 sends the signal that is used to detect portable equipment 2 (hereinafter referred to as detection signal) from control part.CPU90 is according to this detection signal, and the index signal that will be used to make CPU3A, 3B, 3C, 3D send above-mentioned transducer work index signal sends to mobile unit 1A, 1B, 1C, 1D.And CPU90 sends to mobile unit 1A, 1B, 1C, 1D and is used to make CPU3A, 3B, 3C, the 3D computing index signal from mobile unit 1A, 1B, 1C, 1D to the distance of portable equipment 2.The range information that CPU90 sends that CPU3A, 3B, 3C, 3D calculate from mobile unit 1A, 1B, 1C, 1D to portable equipment 2.CPU90 calculates portable equipment 2 and where is positioned at automobile according to the range information that CPU3A, 3B, 3C, 3D calculate.In the calculating in these portable equipment 2 residing places, CPU90 reads the routine data that is used to calculate portable equipment 2 places of living in that is stored in the memory (not shown).And, in the calculation process of this program that CPU90 carried out, by using, thereby can calculate portable equipment 2 residing places from the consistent point of each distance of reading from the range information of mobile unit 1A, 1B, 1C, 1D.For example, the distance to portable equipment 2 that mobile unit 1A calculates is 120cm, the distance to portable equipment 2 that mobile unit 1B calculates is 212cm, and the distance to portable equipment 2 that mobile unit 1C calculates is 20cm, and the distance to portable equipment 2 that mobile unit 1D calculates is 117cm.At this moment, CPU90 calculate apart from the distance of mobile unit 1A be 120cm point, apart from the distance of mobile unit 1B be 212cm point, be the point of 20cm, be the point of the some unanimity of 117cm apart from the distance of mobile unit 1C apart from the distance of mobile unit 1D, be judged as on this consistent putting and have portable equipment 2.
Portable equipment 2 has CPU11, flash memory 13, demodulation section 24, modulation portion, and 25, reception antenna 18, transmitting antenna 19, transducer 20,21,22.
CPU11 send by demodulation section 24 demodulation from confirmation signal A in the car of mobile unit 1A, 1B, 1C, 1D.To modulation portion, 25 send confirmation signal B in the car to CPU11 according to confirmation signal A in this car.CPU11 sends the transducer work index signal from mobile unit 1A, 1B, 1C, 1D by demodulation section 24 demodulation.CPU11 makes transducer 21 be operating state according to this transducer work index signal.Therefore, the signal from mobile unit 1A, 1B, 1C, 1D by demodulation section 24 demodulation is not carried out any processing, just can be directly by modulation portion, 25 carry out FSK modulation back sends from transmitting antenna 19.CPU11 sends by the transducer from mobile unit 1A, 1B, 1C, 1D of the demodulation section 24 demodulation index signal of not working, and according to this transducer index signal of not working, makes transducer 21 be off position.
The work of===distance calculation system===
On one side with reference to Fig. 8 and even Figure 11, on one side the work of distance calculation system of the present invention is described.Fig. 9 is the flow chart of one of the work of expression distance calculation system of the present invention example.Figure 11 is the figure of one of the display frame of expression monitor 92 example.
In addition, in the present embodiment, the carrier is opened and take automobile with the door of automobile, the carrier places somewhere in the automobile with portable equipment 2, describes but the carrier will place situation about forgeing in the place of portable equipment 2.In addition, establish transducer 21 and be off position.
Be arranged on the control part (not shown) in the automobile in addition, receive signal (S301) based on the pent situation of door of automobile.Control part will be used to confirm that according to this signal the signal that whether begins engine start sends to CPU90.
And CPU90 receives the signal based on the pent situation of door of automobile according to this signal from control part, and the index signal that will be used to make CPU3A, 3B, 3C, 3D send confirmation signal A in the car sends to mobile unit 1A, 1B, 1C, 1D.
Below, though mobile unit 1A is described, also be identical work for mobile unit 1B, 1C, 1D.
CPU3A is if receive above-mentioned index signal from CPU90, then confirmation signal A (S302) in sending part 7A sends car.At this moment, the CPU3A timer 5A that resets.Timer 5A after being reset picks up counting.And, CPU3A judge whether to send here within the predetermined time by acceptance division 8A demodulation from confirmation signal B (S303) in the car of portable equipment 2.Sending part 7A carries out the ASK modulation with the carrier wave of the frequency of 125kHz to confirmation signal A in this car.And, send confirmation signal A in the car that the ASK of sending part 7A modulated through transmitting antenna 9A.
If the reception antenna 18 of portable equipment 2 receives the interior confirmation signal A of car that ASK modulates, then the interior confirmation signal A of car that modulated of 24 couples of ASK of demodulation section carries out demodulation.And if CPU11 is judged as and has sent by confirmation signal A (S401 is) in the car of demodulation section 24 demodulation, to modulation portion, 25 send confirmation signal B (S402) in the car.Modulation portion, the carrier wave of the frequency of 25 usefulness 312MHz is to carrying out the FSK modulation from confirmation signal B in the car of CPU11.Send by modulation portion through transmitting antenna 19,25 carried out the interior confirmation signal B of car of FSK modulation.
If the reception antenna 10A of mobile unit 1A receives the interior confirmation signal B of car that FSK modulate, then confirmation signal B carries out demodulation in acceptance division 8A the car that FSK was modulated.If CPU3A be judged as sent by acceptance division 8A demodulation from confirmation signal B (S303 is) in the car of portable equipment 2, then send confirmation signal (S320) to CPU90.Equally, the CPU3B of mobile unit 1B, 1C, 1D, 3C, 3D are judged as and have sent from confirmation signal B in the car of portable equipment 2, then send confirmation signal to CPU90.In addition, CPU3A is being judged as: behind the confirmation signal A, do not send in the given time (S303 is not) under the situation by confirmation signal in the car of acceptance division 8A demodulation in the transmission car, then send signal unconfirmed (S321) to CPU90.
CPU90 sends engine start enabling signal (S304) according to the affirmation signal from mobile unit 1A, 1B, 1C, 1D to control part (not shown).According to this engine start enabling signal from CPU90, for example control part begins the driving of the engine of automobile.Have, CPU90 sends engine start to control part and disapproves signal (S318) according to the signal unconfirmed from mobile unit 1A, 1B, 1C, 1D again.And control part is until key inserts the startup (S319) that just begins car engine in the keyhole.
For example, the carrier portable equipment 2 is placed somewhere in the automobile, but forgotten under the situation in portable equipment 2 residing places, the input part (not shown) of carrier in being located at automobile is used to detect the indication input of portable equipment 2.Control part receives the index signal of having carried out the situation of indication input based on input part.And control part sends detection signal according to this index signal to CPU90.CPU90 is if reception from the detection signal (S305 is) of control part, then sends the index signal that CPU3A, 3B, 3C, 3D transmission transducer work index signal are used to mobile unit 1A, 1B, 1C, 1D.
CPU3A is if reception from the above-mentioned index signal of CPU9, then sends transducer work index signal (S306) to sending part 7A.Sending part 7A carries out the ASK modulation with the carrier wave of the frequency of 125kHz to this transducer work index signal.And, send the transducer work index signal of modulating from the ASK of sending part 7A through transmitting antenna 9A.
If the reception antenna 18 of portable equipment 2 receives the transducer work index signal that ASK modulated, then 24 couples of ASK of demodulation section transducer work index signal of modulating is carried out demodulation.And,, then make transducer 21 be operating state (S404) if CPU11 is judged as the transducer work index signal (S403 is) that has sent by demodulation section 24 demodulation.
In addition, if CPU3A sends above-mentioned transducer work index signal, then to sending part 7A transmission range computing signal (S307).At this moment, CPU3A resets counter 4A, makes counter 4A begin to count from the rising edge of this distance operation with signal.And then CPU3A resets timer 5A, thereby picks up counting.And CPU3A judges whether to return this distance operation signal (S308) from portable equipment 2 in the given time.Sending part 7A carries out ASK modulation to this distance operation with signal with the carrier wave of the frequency of 125kHz.And, send the distance operation signal of modulating from the ASK of sending part 7A through transmitting antenna 9A.
If the reception antenna 18 of portable equipment 2 receives the distance operation signal that ASK modulated, then the distance operation modulated of 24 couples of ASK of demodulation section carries out demodulation with signal.At this moment, because transducer 21 is an operating state, so be sent straight to modulation portion by the distance operation from mobile unit 1A of demodulation section 24 demodulation with signal, 25 (S406).Modulation portion, the carrier wave of the frequency of 25 usefulness 312MHz carries out the FSK modulation to the distance operation from demodulation section 24A with signal.Send by modulation portion through transmitting antenna 19,25 carried out the distance operation signal of FSK modulation.
If the reception antenna 10A of mobile unit 1A receives the distance operation signal that FSK modulated, then acceptance division 8A carries out demodulation to the distance operation that FSK modulated with signal.If CPU3A be judged as sent by acceptance division 8A demodulation from the distance operation of portable equipment 2 with signal (S308 is), the then count value of read-out counter 4A.And CPU3A is according to this count value, calculates from mobile unit 1A to portable equipment 2 distance.In addition, the computational methods of 2 distance from mobile unit 1A to portable equipment that the CPU3A of this moment carries out are identical with the 1st execution mode.And 2 the range information from mobile unit 1A to portable equipment that CPU3A will calculate sends to CPU90 (S310).Equally, the CPU3B of mobile unit 1B will be from mobile unit 1B to portable equipment 2 range information send to CPU90 (S311).In addition, the CPU3C of mobile unit 1C will be from mobile unit 1C to portable equipment 2 range information send to CPU90 (S312).And then, the CPU3D of mobile unit 1D, will be from mobile unit 1D to portable equipment 2 range information send to CPU90 (S313).In addition, CPU3A sends this transducer index signal (S309) of not working to sending part 7A when calculating from mobile unit 1A to portable equipment 2 distance.Sending part 7A carries out the ASK modulation with the carrier wave of the frequency of 125kHz to this transducer index signal of not working.And, send the transducer of modulating from the ASK of the sending part 7A index signal of not working through transmitting antenna 9A.In addition, if CPU3A is judged as the transmission range computing and does not return in the given time after with signal by the distance operation of acceptance division 8A demodulation with signal (S308 is not), then will be judged as not layback computing with the information of signal for example from the address 1 beginning storage in order of flash memory 6A.At this moment, CPU3A judges whether address 2 stores this information (S316) of not returning this distance operation usefulness signal that is judged as.And, if being judged as, CPU3A do not store this information (S316 is not) in the address 2, then send transducer work index signal (S306) to sending part 7A once more.In addition, CPU3A resets timer 5A and picks up counting as mentioned above, counter 4A is resetted and begins counting.And, if being judged as once more, CPU3A do not have the layback computing with signal (S308 not), then make to be judged as not layback computing and for example to be stored in the information of signal in the address 2 of flash memory 6A (S316).And,, then will send to CPU90 based on the signal of this judgement if CPU3A is judged as to store in the address 2 to be judged as and does not have the information (S316 is) of layback computing with signal.CPU90 also receives this signal from mobile unit 1B, 1C, 1D as if this signal that not only receives from mobile unit 1A, then is judged as portable equipment 2 (S317) not in automobile.And CPU90 is shown as portable equipment 2 not in automobile in order to make monitor 92, sends index signal to control part (not shown).Control part makes monitor 92 show that portable equipment 2 is not in automobile according to this index signal from CPU90.
As mentioned above, CPU90 is if receive above-mentioned range information from mobile unit 1A, 1B, 1C, 1D, then calculates where (S314) that portable equipment 2 is positioned at automobile according to this range information.In addition, the calculating in portable equipment 2 places of living in that CPU90 carried out of this moment, as mentioned above, be to ask for from the point of following each point unanimity: with mobile unit 1A is starting point, the point (Figure 10 single-point line A) of the distance that CPU3A calculates from this starting point; With mobile unit 1B is starting point, the point (Figure 10 double dot dash line B) of the distance that CPU3B calculates from this starting point; With mobile unit 1C is starting point, the point (Figure 10 dotted line C) of the distance that CPU3C calculates from this starting point; With mobile unit 1D is starting point, the point (Figure 10 solid line D) of the distance that CPU3D calculates from this starting point.And the portable equipment 2 residing places that CPU90 calculates in order to make are presented on the monitor 92, send index signal to control part.Control part makes portable equipment 2 residing places be presented at (S315, Figure 11) on the monitor 92 according to the index signal from CPU90.
Like this, when the carrier forgets portable equipment 2 residing places, by according to the distance operation signal, CPU3A, 3B, 3C, 3D calculate the distance from each mobile unit 1A, 1B, 1C, 1D to portable equipment 2, thereby CPU90 can calculate portable equipment 2 residing places.
According to above-mentioned execution mode, from the phase difference that the distance operation when mobile unit 1 sends is judged with signal and the distance when portable (transmission) equipment 2 returns, CPU3 can calculate the distance between mobile unit 1 and the portable equipment 2.In addition, since from the distance operation that sends from CPU3 with signal with from portable equipment 2 that return with the identical distance operation signal of distance operation usefulness signal that sends from CPU3, calculate the distance between mobile unit 1 and the portable equipment 2, so can calculate correct distance reliably.
In addition,, in the communication of portable equipment 2, communicate and can produce phase difference intentionally at mobile unit 1 by carrier wave with low frequency.In addition, from portable equipment 2 to the communication of mobile unit 1, communicate by carrier wave, thereby can make the phase difference that produces to the communication of portable equipment 2 by mobile unit 1 for ignoring the phase difference of degree with high frequency.That is, by at the phase difference that to the communication of portable equipment 2, have a mind to produce from mobile unit 1, can calculate from mobile unit 1 to portable equipment a plurality of distances of 2.
In addition, CPU3 be judged as from phase difference calculating be predetermined distance when above from the distance of portable equipment 2, can carry out with portable equipment 2 between communicate by letter.Therefore, even for example by trunking is communicated between portable equipment 2, also can carry out with portable equipment 2 between communicate by letter.
In addition, CPU3 reads the fail safe aspect of distance operation with the person of reading of signal owing to change the pattern that the distance operation that generates every stated number is used signal so can improve for waiting by readout equipment.In addition and since CPU3 return distance operation from portable equipment 2 with signal before the signal of transmission range computing always, so can calculate reliably and portable equipment 2 between distance.
In addition, at mobile unit 1 that the carrier wave by low frequency communicates in the communication of portable equipment 2, be applicable to the ASK modulation of the modulation that the carrier wave based on low frequency carries out by use, thereby circuit constitutes and to become easily, also can carry out from mobile unit 1 to portable equipment 2 communication even disturb to a certain degree.And, the carrier wave by high frequency communicate from portable equipment 2 to the communication of mobile unit 1, be applicable to the FSK modulation of the modulation that the carrier wave based on high frequency carries out by use, thereby be difficult to be subjected to the influence that causes by noise, can reliably send, and not damage the information of portable equipment 2 to mobile unit 1.
In addition, the counter 4 that adopts timer 5 that the detected phase difference uses, counts with the clock of assigned frequency, stored and become the flash memory 6 of information of calculating the basis of the distance between mobile unit 1 and the portable equipment 2 according to count value CPU3, CPU3 can reliably calculate and portable equipment 2 between distance.In addition, by timer 5 sum counters 4 that reset during with signal in each CPU3 transmission range computing, thereby can prevent CPU3 from missing and from as 2 distance operations of model identical with the distance of calculating the signal with portable equipment 2.Therefore, CPU3 can further calculate reliably and portable equipment 2 between distance.
Further, CPU3 can calculate the distance between mobile unit 1 and the portable equipment 2, be judged as this distance do not surpass predetermined apart from the time, door that can opening automobile.In addition, be predetermined distance when above being judged as this distance, can lock the door of automobile.That is,, just can carry out the unlatching and the locking of the door of automobile not by key (key of automobile) is inserted in the keyhole.
In addition, being judged as distance between mobile unit 1 and the portable equipment 2 at CPU3 is preset distance when above, can make alarm portion (not shown) work.Therefore, thus when making trunking get involved judging part to carry out above-mentioned judgement, can know to communicate through trunking.
Other execution modes of======
More than, in the distance calculation system of the present invention, mobile unit is illustrated to the calculating of the distance of portable equipment, but above-mentioned explanation is used to make understanding of the present invention to become easily, does not limit the present invention.The present invention does not break away from its spirit and can change, improve.
The unlatching of＜＜automotive door〉〉
In the present embodiment, the carrier is by switching diverter switch (not shown), thereby carries out unlatching or all unlatchings of door of the door of the driver's seat side that the carrier selected, but is not limited to this.For example, in above-mentioned mobile unit 1A, 1B, 1C, 1D, the carrier enters under the interior situation in zone, as mentioned above, CPU3A calculates the distance of mobile unit 1A and portable equipment 2, CPU3B calculates the distance of mobile unit 1B and portable equipment 2, and CPU3C calculates the distance of mobile unit 1C and portable equipment 2, and CPU3D calculates the distance of mobile unit 1D and portable equipment 2.And CPU90 can judge that according to the range information from CPU3A, 3B, 3C, 3D portable equipment 2 is whether the carrier is from the nearly vehicle of driver's seat side joint.For example, in Figure 10, under the situation of the long distance of the range information that the range information that the CPU3B of mobile unit 1B calculates is calculated for the CPU3A than mobile unit 1A, CPU90 can be judged as the carrier near the codriver's seat side.Under this situation, for example when the carrier selects to open the door of driver's seat side with diverter switch, also can be set to CPU90, so that the door of codriver's seat side is opened to control part (not shown) indication.
Being suitable for of＜＜distance calculation system〉〉
In the present embodiment, automotive door is not carried out the key operated passive keyless that just can lock or open and enter the mobile unit of systemic-function though distance calculation system has been used to load, use object of the present invention is not limited to this.
Make the people that needs specific shelter (for example children or old man, below be called the person of being monitored) hold portable equipment 2, the monitoring arrangement that people (below the be called the observer) management that monitors the person of being monitored and mobile unit 1 have same function.And the observer is according to from confirmation signal A in the zone of monitoring arrangement, and monitoring arrangement judges whether to send confirmation signal B in the zone here from portable equipment 2, thereby but can judge that the person of being monitored is whether in communication range.And, be judged as at monitoring arrangement and do not send from portable equipment 2 from the zone of the portable equipment 2 that the person of being monitored holds during confirmation signal B, for example, monitoring arrangement by the alarm of ringing (alarm) but after make the observer know that the person of being monitored has gone out from communication range.Therefore, can realize the person's of being monitored that undertaken by the observer rapid protection.In addition, also can be configured such that the flash memory 13 storage recognition codings that respectively are not monitored the portable equipment 2 that the person has, confirmation signal B in the zone sends these recognition codings from portable equipment 2.Thus, but the observer can grasp who has gone out from communication range among the person of being monitored.Further, also can a plurality of monitoring arrangements be set as described in the 2nd execution mode.And, confirmation signal A in the sending zone from these a plurality of monitoring arrangements.But suppose to walk out under the situation of communication range the person of being monitored, but according to this person of being monitored walk out communication range before the zone that receives of a plurality of monitoring arrangements in confirmation signal B, but the observer can know easily that the person of being monitored walks out the direction of communication range.This is because monitoring arrangement judges in the sending zone behind the confirmation signal A, whether to send confirmation signal B in the zone in official hour t1.Therefore, near confirmation signal B in the sending zone at first in the nearest monitoring arrangement person of being monitored.Thus, but can judge that the person of being monitored walks out the direction of communication range by near this person's of being monitored nearest monitoring arrangement.Therefore, the person's of being monitored who is undertaken by the observer search is more reliable.Thus, but can prevent from advance to walk out communication range and the accident that causes by the person of being monitored.Further, but walk out the person of being monitored under the situation of communication range, monitoring arrangement is judged as and does not send confirmation signal B in the zone of portable equipment 2, and transmission range computing signal.And supposing is having between portable equipment 2 and the monitoring arrangement under the situation of trunking, returns this distance operation signal through trunking to monitoring arrangement.The distance operation of monitoring arrangement when sending be with signal with from the distance operation of portable equipment 2 phase difference with signal, calculates the distance of portable equipment 2 and monitoring arrangement.At this moment, the monitoring arrangement distance that is judged as the portable equipment of being calculated 2 and monitoring arrangement surpasses preset distance.Thus, but the observer can easily judge the state that the person of being monitored goes out from communication range.Therefore, can prevent for example abducting of the person of being monitored that undertaken by the people who holds trunking etc. in advance.
In addition, also the key as family of portable equipment 2 for example can be used.Under this situation, the door of staying at home go up to be provided with the management devices that has same function with mobile unit 1, as described in the 1st execution mode, can use oneself door is not carried out the key operated mode that just can lock or open.In addition, suppose to have between portable equipment 2 and the management devices under the situation of trunking, the distance that management devices is judged as the portable equipment 2 of calculating in the management devices and management devices has surpassed predetermined distance.Therefore, management devices makes with communicating by letter of portable equipment 2 and stops.Therefore, can improve the fail safe aspect, can prevent to wait the infringement that causes to the thief of the intrusion of family through the trunking realization.In the time of can being used to enter into building outside the family etc. equally.
In addition, for example also portable equipment 2 can be arranged on the valuables.Under the situation of having lost the valuables that are provided with portable equipment 2, distance operation is sent from have the explorer with mobile unit 1 identical function with signal.And by making explorer near being arranged on portable equipment 2 on the valuables, thereby portable equipment 2 returns the distance operation signal from explorer.By sending the distance operation signal from portable equipment 2 to explorer, thereby explorer can be calculated the distance of portable equipment 2.And when the distance of calculating at explorer to portable equipment 2 was preset distance, for example by the alarm of ringing (alarm), thereby the people who holds explorer just can judge valuables nearby.
Have again, for example, also can on power checker etc., be provided with and mobile unit 1 identical functions.Under this situation, make the gager of power checker etc. hold portable equipment 2.And power checker etc. are in order to judge whether portable equipment 2 does not surpass preset distance and transmission range computing signal.And, be judged as portable equipment 2 at power checker etc. and surpass under the situation of preset distance, can be set to the data value of the meterings such as meter transmitted power measuring appliance held to the gager.Thus, in the collection of the data value of metering such as power checker, with non-contacting mode such as power meter measuring device, just can collect this data value.And then in recent years, the collection of the data value of metering such as power checker can wait by the internet and collect, but the possibility of being read by the third party is arranged.Yet, above-mentioned power checker, if adopt portable equipment 2 to carry out the collection of the data value of metering such as power checker, the possibility of being read this data value by the third party reduces, and can improve the fail safe aspect.In addition, suppose to exist under the situation of trunking between portable equipment 2 and power checker etc., power checker etc. are judged as: the distance of the portable equipment 2 of calculating in power checker etc. and power checker etc. surpasses preset distance.Therefore, power checker etc. makes with communicating by letter of portable equipment 2 and stops.Thus, can prevent the state of affairs of the data value that measured through trunking read-out power measuring appliance.
Have again, allow people, for example child of the required protection of Protector hold portable equipment 2, be arranged on the search machine that has in the electric post with mobile unit 1 identical function.And the child who holds this portable equipment 2 for example is being under the situation of abducting etc., is helpful as the information that is used to follow the trail of child.Under this situation, be arranged on the search machine transmission range computing signal in the electric post.If the child who holds portable equipment 2 is by near the electric post that is provided with this search machine, then send distance operation signal from portable equipment 2 to the search machine.At this moment, the search machine is calculated the distance of portable equipment 2, makes simultaneously from the time information of portable equipment 2 transmission range computings with signal for example to be stored in the flash memory 6.And for example police waits by reading this time information in the flash memory 6 that is stored in the search machine, thus can judge child when by place apart from a certain position of search machine.In addition, send the above-mentioned time information of search machine by allotting to this child's branches such as Protector, thereby also can grasp the residing place of child via communication network.And then, suppose between portable equipment 2 and search machine, to exist under the situation of trunking, for example alarm portion (not shown) of portable equipment 2 is given the alarm.Therefore, Protector etc. can know the possibility that someone that hold trunking for example abducts to child as early as possible.Thus, Protector etc. can prevent abducting of child etc.

Claims (22)

1. communicator, comprising:
Sending part, its transmission be used to calculate and the other side's side communicator between the distance operation signal of distance;
Test section, it is by receiving the described distance operation signal that returns from described the other side's side communicator, and this distance operation during with signal and reception of this distance operation when sending detects with the phase difference of signal;
Operational part, it is according to by the detected described phase difference of described test section, the distance between computing and the described the other side's side communicator.
2. communicator according to claim 1 wherein also has:
With the modulation portion of the described distance operation of the carrier modulation of first frequency with signal; With
Demodulation section, its to the demodulation of described the other side's side communicator from described modulation portion, described distance operation with signal after the described distance operation crossed of carrier modulation that return, that use the second frequency also higher than described first frequency carry out demodulation with signal.
3. communicator according to claim 1, wherein,
Also have judging part, it judges whether the distance between the other side's side communicator that described operational part is calculated and described does not surpass preset distance;
According to described judgement section judges for calculate by described operational part and described the other side's side communicator between distance be the judged result of described preset distance when above, stop and the communicating by letter of described the other side's side communicator.
4. communicator according to claim 1, wherein,
Also have the generating unit of the described distance operation of generation with signal,
Described sending part sends the described distance operation signal that described generating unit generates repeatedly, returns described distance operation with till the signal up to receiving from described the other side's side communicator,
When described generating unit is used signal whenever the described distance operation that generates specified quantity, change the pattern of described distance operation with signal.
5. communicator according to claim 2, wherein,
Described modulation portion is carried out ASK modulation to described distance operation with signal with the carrier wave of described first frequency,
Described demodulation section is to carrying out demodulation from described the other side's side communicator described distance operation that return, that cross with the carrier modulation of described second frequency with signal.
6. communicator according to claim 1, wherein,
Further have:
Timer, it is reset when each sending part sends described distance operation with signal, and the described distance operation that timing is returned to reception from described the other side's side communicator is used the time till the signal;
Counter, it is reset when each timer resets, with the clock of assigned frequency to counting by the detected described phase difference of described test section;
Storage part, it is according to the count value of described counter, storage become that described operational part is calculated and described the other side's side communicator between the information on basis of distance;
Described test section detects the time of described timer timing, with the described distance operation when sending with the phase difference of the described distance operation of signal when receiving with signal,
Described operational part according to described counter with the clock count of described assigned frequency the count value during described phase difference, read described information from described storage part, from the distance between this range information computing and the described the other side's side communicator.
7. communicator according to claim 3, wherein,
Be arranged on the automobile,
To control described automobile the door unlatching or the control part of locking,
With described judgement section judges for calculate by described operational part and described the other side's side communicator between the judged result of distance when surpassing described preset distance, supply with as the signal that is used to open described door;
With described judgement section judges for calculate by described operational part and described the other side's side communicator between the judged result of distance when described preset distance is above, supply with as the signal that is used to lock described door.
8. communicator, wherein,
This communicator can communicate with the other side's side communicator, described the other side's side communicator sends the distance operation signal that is used for the computing distance, the described distance operation signal that returns by reception, the phase difference of signal of this distance operation when this distance operation when thereby detection sends is used signal and received, and according to this phase difference calculate and described distance operation with the distance of the home position of signal
This communicator possesses the described distance operation that sends from the described the other side's side communicator portion that returns with signal that returns.
9. communicator according to claim 8 wherein, also has:
Demodulation section, it is to carrying out demodulation from described the other side's side communicator described distance operation that send, that cross with the carrier modulation of first frequency with signal;
Modulation portion, it uses the carrier wave of the second frequency also higher than described first frequency, to being modulated with signal by the described distance operation of described demodulation section demodulation.
10. communicator according to claim 8, wherein,
Also have: make the described portion of returning with signal be the switching part of operating state in order to return described distance operation;
Described switching part is according to the switching signal that is used for the described portion of returning is made as operating state from described the other side's side communicator, and making the described portion of returning is operating state.
11. communicator according to claim 9, wherein,
Described demodulation section to send from described the other side's side communicator, carried out the described distance operation that ASK modulates with the carrier wave of described first frequency and carried out demodulation with signal;
Described modulation portion with the carrier wave of described second frequency, is carried out the FSK modulation to the described distance operation by described demodulation section demodulation with signal.
12. communicator according to claim 8, wherein,
Also have the alarm portion that is used to give the alarm,
Described alarm portion according to from described the other side's side communicator, make the give the alarm alarm signal of usefulness of described alarm portion, give the alarm.
13. the method for detecting position of a distance calculation system, it is the distance calculation system of the distance between computing first communicator and the second communication device, wherein,
Described first communicator comprises:
Sending part, its transmission be used to calculate and described second communication device between the distance operation signal of distance;
Test section, it is by receiving the described distance operation signal that returns from described second communication device, thus this distance operation during with signal and reception of this distance operation when sending detects with the phase difference of signal;
Operational part, it is according to by the detected described phase difference of described test section, the distance between computing and the described second communication device;
Described second communication device comprises the described distance operation that sends from described first communicator portion that returns with signal that returns.
14. distance calculation system according to claim 13, wherein,
Described first communicator has:
First modulation portion, its carrier wave with first frequency is modulated with signal described distance operation;
First demodulation section, it is to carrying out demodulation from described distance operation described second communication device, that use the second frequency also higher than the carrier wave of described first frequency to carry out ovennodulation with signal;
Described second communication device has:
Second demodulation section, its to from described first communicator, by described first modulation portion, the described distance operation of modulating carries out demodulation with signal;
Second modulation portion, its with the carrier wave of described second frequency to modulating with signal by the described distance operation of the described second demodulation section demodulation.
15. distance operation according to claim 13 system, wherein,
Described first communicator also has judging part, and whether its described first communicator and distance between the described second communication device of judging that described operational part is calculated does not surpass preset distance;
, for being the judged result of described preset distance when above, described first communicator of being calculated by described operational part and the distance between the described second communication device stop and the communicating by letter of described second communication device according to described judgement section judges.
16. distance operation according to claim 13 system, wherein,
Described second communication device has: make the described portion of returning with signal be the switching part of operating state in order to return described distance operation;
Described first communicator is in order to be calculated the distance with described second communication device by described operational part, sending and making the described portion of returning is the switching signal that operating state is used,
Described switching part is according to the described switching signal from described first communicator, and making the described portion of returning is operating state.
17. distance calculation system according to claim 13, wherein,
Described first communicator has the generating unit of the described distance operation of generation with signal,
Described sending part sends the described distance operation signal that described generating unit generates repeatedly, and receive from described second communication device up to described first communicator and return described distance operation with till the signal,
When described generating unit is used signal whenever the described distance operation that generates specified quantity, change the pattern of described distance operation with signal.
18. distance operation according to claim 14 system, wherein,
Described first modulation portion comes ASK to modulate described distance operation signal with the carrier wave of described first frequency;
The described second demodulation section demodulation was carried out the described distance operation signal that ASK modulates from described first communicator by described first demodulation section;
Described second modulation portion is come the described distance operation signal of FSK modulation by the described second demodulation section demodulation with the carrier wave of described second frequency;
The described first demodulation section demodulation from described second communication device by described second modulation portion, carried out the described distance operation signal of FSK modulation.
19. distance calculation system according to claim 14, wherein,
In order to use frequency spectrum diffusion to carry out communicating by letter of described a plurality of first communicator and described second communication device,
Described first modulation portion, with the carrier wave primary modulation of described first frequency described distance operation with signal after, secondary promptly spreads modulation with the described distance operation signal after the carrier wave primary modulation of described first frequency;
Described second demodulation section, back-diffusion is from described first modulation portion of passing through of described first communicator, and secondary promptly spreads the described distance operation signal after the modulation, and carries out demodulation;
Described second modulation portion, with the carrier wave primary modulation of described second frequency by the described distance operation after the described second demodulation section back-diffusion demodulation with signal after, secondary promptly spreads the described distance operation signal that modulation is crossed with the carrier wave primary modulation of described second frequency;
Described first demodulation section, back-diffusion be from described second modulation portion of passing through of second communication device, and secondary promptly spreads described distance operation after the modulation with signal and carry out demodulation.
20. distance calculation system according to claim 13, wherein,
Described first communicator has:
Timer, it is reset when each sending part sends described distance operation with signal, and the described distance operation that timing is returned to reception from described second communication device is used the time till the signal;
Counter, it is reset when each timer resets, with the clock of assigned frequency to counting by the detected described phase difference of described test section;
Storage part, it is according to the count value of described counter, and storage becomes the information that described operational part is calculated the basis of the distance between described first communicator and the described second communication device;
Described test section detects the time of described timer timing, with the described distance operation when sending with the phase difference of the described distance operation of signal when receiving with signal;
Described operational part, according to described counter with the clock count of described assigned frequency the count value during described phase difference, read described information from described storage part, from the distance between described first communicator of this range information computing and the described second communication device.
21. distance calculation system according to claim 15, wherein,
Described first communicator is arranged on the automobile,
To control described automobile the door unlatching or the control part of locking,
Judged result when described judgement section judges is surpassed described preset distance for described first communicator of being calculated by described operational part with the distance between the described second communication device is as the signal supply that is used to open described door;
With described first communicator and distance judged result when described preset distance above described second communication device between of described judgement section judges, as the signal supply that is used to lock described door for calculating by described operational part.
22. distance calculation system according to claim 15, wherein,
Described second communication device has the alarm portion that is used to give the alarm,
Described first communicator, be described first communicator of calculating by described operational part and the judged result of distance when described preset distance is above between the described second communication device according to described judgement section judges, transmission makes the give the alarm alarm signal of usefulness of described alarm portion
Described alarm portion gives the alarm according to the described alarm signal from described first communicator.
CNA2005101140448A 2004-10-19 2005-10-19 Communication device and distance calculation system Pending CN1801660A (en)

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