JP4211545B2 - Interference radio alarm device - Google Patents

Description

  The present invention relates to an interfering radio wave notification device for detecting and reporting interfering radio waves.

  Conventionally, an in-vehicle communication system including a communication device using CDMA (Code Division Multiple Access) or the like has been used. For example, as a means for preventing vehicle theft, a vehicle theft that communicates with the outside by a wireless device and notifies the danger of vehicle theft based on the detection of door opening and glass breakage by a sensor installed in the vehicle A prevention device is used (see, for example, Patent Document 1).

However, in such an in-vehicle communication system, the communication device may be forced to be in the same state as being out of the communicable area by the jamming radio wave even though the communication apparatus is in the communicable area such as the base station. . For example, when a person who attempts to tamper with a vehicle operates a jamming radio wave generator near a vehicle on which the above-described vehicle theft device is mounted, communication becomes incomplete. Thus, even if the vehicle is pry open and moved after communication failure, there is a possibility that it is impossible to report theft to a predetermined report destination.
JP 2003-112606 A

  Conventionally, in such a case, even if the communication function can determine whether or not there is communication failure, it is determined whether the communication failure is due to jamming radio waves or out of communication range. I couldn't.

  An object of this invention is to provide the apparatus which detects and alert | reports presence of a jamming electric wave in view of the said point.

In order to achieve the above object, the invention described in claim 1 includes a wireless means (21) for receiving a radio wave and a detection means (305, 310) for detecting the presence of a jamming radio wave based on the received radio wave of the radio means. 315, 320) and notification means (325, 330, 335, 340) for performing notification based on the detection of the detection means , wherein the wireless means performs CDMA wireless communication, and the detection means Is a jamming radio wave notification device that detects the presence of jamming radio waves based on the received electric field strength in the radio means and the ratio of pilot energy in the received radio waves to the total energy of the received radio waves .

  Thereby, the jamming radio wave notification device can detect and notify the presence of the jamming radio wave. The target notified by the notification means may be any object such as a user of the jamming radio alarm device, the surroundings of the jammer radio alarm device, an information center as a radio communication target, and the like.

Further, an invention according to claim 2, in jamming notification apparatus according to claim 1, wherein the detecting means, the receiving electric field intensity in the radio unit is higher than a predetermined intensity reference value, and in the receiving radio wave The presence of jamming radio waves is detected based on the ratio of pilot energy to the total energy of the received radio waves being lower than a predetermined ratio reference value.

Further, an invention according to claim 3, in jamming notification apparatus according to claim 1 or 2, wherein the detecting means based on the output signal from the wireless unit, receiving electric field strength in the radio unit, and characterized by detecting the intensity ratio against the received radio overall energy of the pilot energy in the received radio wave.

According to a fourth aspect of the present invention, there is provided the interference radio wave alarm device according to any one of the first to third aspects, wherein the notification unit is configured to move around the vehicle 1 based on the detection by the detection unit. It is characterized by notifying.

According to a fifth aspect of the present invention, there is provided the interfering radio wave notification device according to any one of the first to fourth aspects, wherein the notification unit is configured to perform wireless communication based on the detection by the detection unit. Notification is performed.

  As the wireless communication, the wireless means described in claim 1 may be used, or other communication means may be used.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the process of the software for functioning the following security ECU as a specific means as described in embodiment mentioned later, or a specific means.

  FIG. 1 is a diagram schematically showing an overall configuration of a vehicle antitheft system according to an embodiment of the present invention.

  This system includes a vehicle 1 having sensors such as an approach sensor 11, a device such as a horn 18, a security ECU 10, a wireless device 21, etc., a user of the vehicle 1 via the Internet 3, a mobile phone network, and a telephone network, the police, It has a data center 2 that can communicate with a security company or the like.

  When the data center 2 receives the notification of the abnormal situation from the vehicle 1, the data center 2 notifies the predetermined report destination of the occurrence of the abnormal situation. In the present embodiment, the predetermined report destination is a mobile phone, a personal computer, or the like owned by a user of the vehicle 1 that is a notification source, a police, a security company security guard, or the like. Hereinafter, the operation of the CPU will be described as the operation of the data center 2 for explanation.

  In FIG. 2, the structure of the apparatus which concerns on the vehicle antitheft system which the vehicle 1 has is shown. The vehicle 1 includes a vibration sensor 9, an approach sensor 11, an intrusion sensor 12, a tilt sensor 13, a glass break sensor 14, a door open sensor 15, a horn 18, a hazard 19, a keyless / smart ECU 20, and a radio device 21.

  The wireless device 21 can perform communication by CDMA, and includes an antenna 23, a baseband processor 24, a reception circuit 25, a transmission circuit 26, and a memory 27.

  The receiving circuit 25 performs amplification, frequency conversion, demodulation, A / D conversion, and the like on the signal received by the antenna 23 and outputs the result to the baseband processor 24.

  The transmission circuit 26 performs D / A conversion, modulation, frequency conversion, amplification, and the like on the data input from the baseband processor 24, and outputs the resulting signal to the antenna 23.

  The memory 27 includes a RAM, a ROM, and an EEPROM (not shown), and outputs data in the storage area of the RAM, ROM, and EEPROM to the baseband processor 24 based on a control signal from the baseband processor 24, or a baseband processor. Data input from 24 is written into RAM and EEPROM.

  The baseband processor 24 is composed of, for example, an FPGA (Field Programmable Gate Array) whose circuit configuration is programmable, and performs processing based on the programmed circuit configuration on data input from the receiving circuit 25. The resulting data is output to the security ECU 10, the data input from the security ECU 10 is subjected to processing based on the programmed circuit configuration, and the resulting data is output to the transmission circuit 26. The baseband processor 24 outputs control signals for writing and reading information to and from the ROM, RAM, and EEPROM of the memory 27 as necessary for the above processing.

  As specific processing of the baseband processor 24 in the present embodiment, a predetermined despreading process is performed on the data received from the receiving circuit 25, and further, a predetermined QPSK or the like is demodulated on the resultant data, The resulting data is transmitted to the security ECU 10. The baseband processor 24 also modulates the data input from the security ECU 10 for wireless transmission, such as predetermined QPSK, and performs a spreading process on the resulting data, The data is output to the transmission circuit 26.

  The baseband processor 24 also receives received signal strength in CDMA wireless communication (hereinafter referred to as received field strength) based on data input from the receiving circuit 25 and subjected to demodulation such as despreading and QPSK, and the reception of the received signal. The value of the intensity ratio (hereinafter referred to as Ec / Io) of the known signal contained in the radio wave to the entire received radio wave is periodically calculated.

  More specifically, Ec / Io is the ratio of the pilot energy (corresponding to Ec) to the in-band transmission power spectral density (Io). The pilot energy is the energy of a pilot channel signal. Also, the pilot channel refers to a direct sequence spread spectrum signal that is transmitted continuously by each CDMA base station and is not modulated and whose contents are determined in advance. With the pilot channel, the mobile station can acquire the timing of the downlink CDMA channel.

  Further, the baseband processor 24 outputs the calculated received electric field strength and Ec / Io values as signals to the security ECU 10.

  The vibration sensor 9 has an acceleration sensor, detects vibration of the vehicle 1 by this acceleration sensor, and notifies the security ECU 10 of the detection.

  The approach sensor 11 has a radio wave sensor directed to the outside of the vehicle. The radio wave sensor detects that a person has approached the vehicle 1 from the outside of the vehicle 1 (for example, within 2 m from the surroundings), and notifies the security ECU 10 of the detection. It comes to notify.

  The intrusion sensor 12 has a radio wave sensor directed into the vehicle, detects a person who enters the inside of the vehicle 1 by the radio wave sensor, and notifies the security ECU 10 of the detection.

  The inclination sensor 13 includes an inclination angle sensor. The inclination angle sensor detects that the attitude of the vehicle has suddenly changed, that is, suddenly inclines, and notifies the security ECU 10 of the detection. As a threshold value for determining whether or not there is a steep inclination, for example, about 15 to 30 ° is conceivable.

  The glass break sensor 14 has a device that detects that the conducting wire embedded in the glass of the vehicle 1 is broken, detects that the glass is broken by this device, and notifies the security ECU 10 that it has been detected. It has become.

  The door opening sensor 15 includes a door switch that is turned on and off by opening and closing the door of the vehicle 1. The door opening sensor 15 detects that the door has been opened by the door switch, and outputs a signal to the security ECU 10 that the detection has been made. It has become.

  The horn 18 is a device that emits a horn sound, and is operated by a control signal from the security ECU 10.

  The hazard 19 is a device that turns on and off the hazard lamp, and operates according to a control signal from the security ECU 10 or the like.

  The horn 18 and the hazard 19 operate as a vehicle alarm device in the present embodiment. That is, the horn 18 notifies the abnormal situation to the surroundings by sounding, and the hazard 19 notifies the abnormal situation to the surroundings by blinking.

  The keyless / smart ECU 20 detects the key lock of the key of the vehicle 1 and the keyless entry device, and notifies the security ECU 10 of the detection. The wireless device 21 is a device that can communicate with the data center 2 via a mobile phone network.

  The security ECU 10 is an anti-theft device including a CPU, ROM, RAM, EEPROM, etc. (not shown). The CPU operates by reading and executing a program recorded in the ROM. The CPU reads and writes information from and to the RAM and EEPROM as necessary for this operation. The CPU exchanges data and control signals with the sensors 9 to 15, the horn 18, the hazard 19, the keyless / smart ECU 20, the radio device 21, and the like. In the ROM, identifiers unique to the vehicle, such as a serial number of the security ECU 10 and a vehicle body number, are recorded in advance.

  A theft notification program that is one of the programs executed by the CPU of the security ECU 10 will be described below. In the following description, it is assumed that the operation of the CPU by executing the program is the operation of the program.

  Generally, when the user of the vehicle 1 leaves the vehicle, that is, when measures against theft of the vehicle 1 are required, the user locks the door of the vehicle 1. At this time, the keyless / smart ECU 20 detects the key lock of the key of the vehicle 1 and the keyless entry device, and outputs a signal indicating the detection to the security ECU 10.

  The theft notification program continues to operate while power is supplied to the security ECU 10, and upon receiving a signal indicating that the key lock has been detected, enters the security mode that is an operation mode for protection against theft. . At this time, a flag assigned in the RAM of the security ECU 10 indicating whether or not the security mode is entered is turned on. When the keyless / smart ECU 20 receives a signal indicating that the key lock has been released, the security mode is released. At that time, the flag indicating whether or not the security mode is entered is turned off.

  The theft notification program that has entered the security mode allows the above-described sensors 9 to 15 to detect each function based on the behavior of a person with the purpose of stealing the vehicle 1 or breaking the car (hereinafter referred to as a criminal). When the detection signal is output to the security ECU 10, the CPU of the security ECU 10 outputs a signal to the radio device 21 to notify the abnormal situation, specifically, to notify that there is a risk of theft. Further, the horn 18 and the hazard 19 are operated.

  As a program that the CPU of the security ECU 10 executes simultaneously with the theft notification program, there is a jamming wave detection program. Even if no power is supplied to the security ECU 10 (even if the battery is intentionally removed), this jamming radio wave detection program can operate (communication) if a battery is incorporated in the wireless device. FIG. 3 shows a flowchart of this jamming wave detection program.

  In step 305, it is determined whether the security mode is on or off. Specifically, the determination is made based on whether the flag indicating whether or not the security mode is in the RAM of the security ECU 10 is on or off. If the security mode is on, the process proceeds to step 310; if the security mode is off, the process repeats the process of step 305.

  In step 310, the field strength (RSSI: Receiving Signal Strength Indicator) and Ec / Io are monitored. Specifically, the electric field intensity and Ec / Io values output as signals from the baseband processor 24 are acquired.

  Next, in step 315, it is determined whether Ec / Io has deteriorated. Specifically, it is determined whether or not the value of Ec / Io is equal to or less than a predetermined ratio reference value. The predetermined ratio reference value is, for example, −20 dB. If Ec / Io has deteriorated, the process proceeds to step 320. If not, the process returns to step 305.

  In step 320, it is determined whether the electric field strength is abnormally strong. Specifically, it is determined whether the electric field strength is equal to or greater than a predetermined strength reference value. The predetermined intensity reference value is, for example, a value that is +20 dBm higher than the average value of the electric field intensity. This average value may be input by the user of the vehicle 1 via an input device (not shown) provided in the security ECU 10. Alternatively, the CPU of the security ECU 10 executes a program that constantly monitors the value of the electric field intensity output from the baseband processor 24 and writes the average value to an EEPROM or the like. The value may be used as an average value. If the electric field strength is abnormal, the process proceeds to step 325, and if not, the process returns to step 305.

  In step 325, various alarms (intimidation devices) are activated. That is, a notification is given to inform the surroundings that a disturbing radio wave is generated and to intimidate the criminal. Specifically, a control signal is output to the horn 18 and the hazard 19 in order to cause the horn 18 to ring and the hazard 19 to blink.

  Next, in step 330, the in-range / out-of-range determination is performed. Specifically, if Ec / Io is equal to or less than a predetermined out-of-service threshold, it is determined that the user is out of service, and otherwise, it is determined that the user is out of service. The out-of-service threshold is an amount that varies slightly based on the current electric field strength. For example, when the electric field strength is −80 dBm to −100 dBm (medium electric field to strong electric field region), the out-of-service threshold is about −16 dB. If it is determined that it is within the range, the process proceeds to step 335, and if it is determined that it is out of range, the process proceeds to step 340.

  In step 335, the data center 2 is notified that the jamming radio wave is being generated. Specifically, a signal including information indicating that jamming waves are generated is output to the baseband processor 24 for wireless transmission. Processing then proceeds to step 340.

  In step 340, it is determined whether or not the security mode is cancelled. Specifically, the determination is made based on whether the flag indicating whether or not the security mode is in the RAM of the security ECU 10 is off or on. If the security mode has been cancelled, the process returns to step 305; otherwise, the process returns to step 325.

  If the Ec / Io deteriorates and the electric field strength is abnormal when the security mode is on by the jamming wave detection program as described above, the security mode is canceled as a result of the determination processing in steps 315 and 320. Then, an alarm indicating the occurrence of jamming radio waves is issued (step 325), and when the vehicle 1 returns to the communication range, the data center 2 is informed of the occurrence of jamming radio waves (steps 330 and 335).

  As described above, the jamming radio wave notification device including the security ECU 10 and the radio device 21 can report the communication jamming due to the jamming radio wave to the surroundings of the vehicle 1, the outside of the data center 2, and the like.

  In the above embodiment, only the detection and notification of jamming radio waves in CDMA has been described. However, the scope of application of the present invention is not limited to CDMA, and is included in the strength of radio waves received in radio communications and in radio waves received. The present invention is also applicable to a communication system that can detect the intensity ratio of a known signal to the entire received radio wave.

  Further, in the above embodiment, it is determined that Ec / Io has deteriorated because Ec / Io is equal to or less than a predetermined fixed ratio reference value, but the predetermined ratio reference value is not necessarily such a fixed value. There is no need.

  For example, the ratio reference value may change based on the point where the vehicle 1 exists. Specifically, the vehicle 1 has a car navigation device or the like that outputs the current position information of the vehicle 1, and the security ECU 10 periodically receives position information and baseband processor 24 that are output from the car navigation device. The average value of Ec / Io for each point is calculated on the basis of the Ec / Io signal that is output in an automatic manner, and is recorded in the EEPROM of the security ECU 10, and in step 315 of FIG. A value that is a predetermined amount lower than the average Ec / Io of the point corresponding to the current position (for example, a value that is 10 dB lower than this average value) may be used as the ratio reference value.

  In addition, for a location where the vehicle 1 is frequently located, such as a parking lot of the vehicle 1, a value lower than the average value for each location by a predetermined amount (for example, a value 10 dB lower than the average value) is used as the predetermined ratio reference value. For other points, a fixed value may be set as a predetermined ratio reference value. That is, the ratio reference value may be realized as a combination of a variable value and a fixed value depending on the position.

  Further, in the above embodiment, it is determined that the received electric field strength is abnormal by determining that the electric field strength is equal to or greater than a predetermined strength reference value. However, the strength reference value is an average value of a fixed electric field strength. There is no need, and the ratio reference value for Ec / Io described above may be a value that changes depending on the position, or a combination of a value that changes depending on the position and a fixed value.

1 is a diagram schematically showing an overall configuration of a vehicle antitheft system according to an embodiment of the present invention. It is a figure which shows the structure of the apparatus which concerns on the vehicle antitheft system which the vehicle 1 has. It is a flowchart of a jamming radio wave detection program.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Data center, 3 ... Internet, 9 ... Vibration sensor,
10 ... Security ECU, 11 ... Approach sensor, 12 ... Intrusion sensor,
13 ... Tilt sensor, 14 ... Glass break sensor, 15 ... Door open sensor, 18 ... Horn,
19 ... Hazard, 20 ... Keyless / Smart ECU, 21 ... Radio, 23 ... Antenna,
24: baseband processor, 25: receiving circuit, 26: transmitting circuit, 27: memory.

Claims (5)

Detection means (305, 310, 315, 320) for detecting the presence of jamming radio waves based on radio waves received by radio means (21) for receiving radio radio waves;
Informing means (325, 330, 335, 340) for informing based on the detection of the detecting means ,
The wireless means performs wireless communication by CDMA,
The detecting means detects the presence of a jamming radio wave based on the received electric field strength in the radio means and the ratio of pilot energy in the received radio wave to the total energy of the received radio wave. . The detection means is based on the fact that the received electric field strength in the radio means is higher than a predetermined strength reference value, and the ratio of pilot energy in the received radio wave to the energy of the entire received radio wave is lower than a predetermined ratio reference value. The interference radio wave notification apparatus according to claim 1 , wherein presence of the interference radio wave interference is detected. It said detecting means, on the basis of the output signal from the wireless unit, to detect the reception electric field intensity, and the intensity ratio against the received radio overall energy of the pilot energy in the received radio wave in the radio unit The jamming wave alarm device according to claim 1 or 2 , characterized in that: The notification means, wherein based on the detection of the detecting means, jamming notification apparatus according to any one of claims 1 to 3, characterized in that the notification to the surroundings of the vehicle 1 The notification means, wherein based on the detection of the detecting means, jamming notification apparatus according to any one of claims 1 and performs a notification via the wireless communication 4.

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