JP3323127B2 - Emergency communication antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency communication antenna, and more particularly, to an emergency communication antenna for performing diversity reception using an emergency communication standby antenna.

[0002]

2. Description of the Related Art A vehicle emergency information reporting system is a system for automatically reporting vehicle emergency information to a service center via a wireless line from a vehicle emergency information reporting device mounted on a vehicle when an accident such as a vehicle collision occurs. is there. This system reduces the time it takes for emergency vehicles such as ambulances and police cars to arrive at the scene, rescues injured people more quickly,
Can be remedied. Also, even in the event of an emergency such as the occurrence of a sudden illness, pressing the emergency button on the vehicle emergency information reporting device will report the vehicle emergency information to the center via a wireless line and allow conversation with the center's service personnel. it can.

The vehicle emergency information service includes an automatic report in the event of an accident, a manual report in an emergency, a manual report in a roadside service, and a normal voice conversation. The automatic notification at the time of occurrence of an accident is to automatically notify the service center when a vehicle collision or an accident occurs, and then to the emergency service center. In the case of an emergency manual call, when an emergency report button is pressed in an emergency such as when a sudden illness occurs, a report is made to the service center, and then a report is made to the emergency service center. In the manual notification of the roadside service, when a trouble such as a puncture is troubled, pressing the load service request button notifies the road service center.

Hereinafter, an outline of functions of a vehicle control device of the vehicle emergency information system will be described. (1) Communication function (communication with a service center): It is possible to use a mobile phone and communicate in an area where the mobile phone can talk. 9600bps data communication and voice communication are possible. Automatically switch between data communication and voice communication. It has a single diversity antenna with automatic switching function. (2) Position detection function (position detection of own vehicle): Position detection is performed by GPS. It has a gyro and can record the position even in a tunnel where GPS cannot be used. Record the usage status of vehicle speed sensor, reverse and brake. (3) Emergency detection function (emergency detection of own vehicle): It has a collision detection device sensor and a rollover sensor, and detects what kind of accident has occurred. (4) Vehicle emergency information notification function (emergency notification to the service center): Automatic notification is performed by detecting the collision detection device sensor and the rollover sensor. Manual notification can also be performed by pressing the vehicle emergency information notification button. (5) Roadside service function (call for support to the service center): A rescue can be requested by manual notification by pressing the load service request button. (6) Handset function (voice communication is possible with handset) and hands-free function (voice communication is possible with hands-free): You can talk as a normal phone with handset and cradle, or you can talk hands-free with microphone and dedicated speaker. .

As shown in FIG. 7, a mobile phone used in a conventional vehicle emergency information reporting device has two antennas, one of which is used for transmission, and one for which reception level is high for reception. The switching uses a so-called diversity reception method. When a car / mobile phone is used for emergency communication from a car, as shown in FIG. 8, two diversity antennas (that is, four antennas) so that emergency communication can be performed even if one of the antennas is damaged. Is installed.

[0006]

In the conventional antenna for emergency communication, it is necessary to install four antennas, a large installation space is required, and the antenna is not used except when the antenna is out of order.

An object of the present invention is to realize a standby antenna for diversity reception and emergency communication using two antennas.

[0008]

According to the present invention, in order to solve the above-mentioned problems, an emergency communication antenna is detected by detecting a reception level by turning off an antenna switch and detecting a failure of the antenna. When both the antenna and the second antenna are normal, diversity reception is performed by two antennas, and when one of the antennas is faulty, control is performed so that transmission and reception are performed only by the normal antenna.

With this configuration, it is possible to share the diversity receiving antenna and the emergency communication spare antenna only by providing two antennas.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is directed to a first antenna, a second antenna, a transmission / reception terminal, a reception terminal, the first antenna and the second antenna. Antenna switching means for switching the connection between the antenna and the transmission / reception terminal and the reception terminal; and diversity reception.
A receiving level detecting means provided in the circuit, an antenna selecting means for controlling the antenna switching means, and an antenna provided between the receiving terminal and the antenna switching means.
Turn off the antenna switch and the antenna switch to receive
Detect antenna failure by detecting level
Means, both the first antenna and the second antenna
Is more normal, receive diversity with two antennas.
Communication, and if one antenna is faulty,
Means for controlling transmission and reception by only the tenor.
The emergency communication antenna has a function of realizing diversity reception and an emergency communication standby antenna with two antennas.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described in detail with reference to FIGS.

(Embodiment) The embodiment of the present invention is described as follows.
This is an emergency communication antenna which realizes a standby antenna for diversity reception and emergency communication with this antenna.

FIG. 1 is a circuit diagram of an emergency communication antenna according to an embodiment of the present invention. In FIG. 1, a mobile phone 1
Are connected to the antennas 3 and 4 by the antenna switch 2. The antenna 3 is a main antenna, and the antenna 4 is a spare auxiliary antenna. Usually, antenna 3
, And diversity reception is performed using the antennas 3 and 4. When the antenna 3 fails, transmission and reception are performed using the antenna 4. FIG. 2 is a diagram illustrating a normal state in which transmission is performed using the main antenna and diversity reception is performed using the main antenna and the sub antenna. FIG.
FIG. 8 is a diagram showing a state at the time of antenna check for transmitting and receiving only with the main antenna. FIG. 4 is a diagram illustrating a state at the time of an antenna check in which transmission and reception are performed using only the sub antenna. FIG.
FIG. 8 is a diagram showing a state where transmission is performed using a main antenna and diversity reception is performed using a main antenna and a sub antenna at the start of an emergency communication sequence. FIG. 6 shows that when the main antenna is determined to have failed, transmission is performed using the sub antenna,
FIG. 3 is a diagram illustrating a state in which diversity reception is performed using a main antenna and a sub antenna.

First, a method of checking an antenna will be described. In the case of the diversity configuration, the antenna with a high reception level is automatically selected and received by the diversity reception circuit built into the mobile phone, so that even if the antenna is selected by the external antenna selection circuit of the mobile phone, the quality of the antenna is good. Not detectable. For this reason, a high-frequency switch is added to the reception terminal to stop diversity reception in the antenna selection circuit. The specific antenna check method is as follows.

(1) As shown in FIG. 2, except when the antenna is checked (normal time), the diversity control circuit turns on the high frequency switch connected to the receiving terminal of the portable telephone.
To operate the diversity reception. That is,
An antenna having a strong reception level is automatically selected by the diversity reception function inside the mobile phone. When the antenna check is performed, diversity reception is stopped and the reception performance of the transceiver deteriorates. Therefore, the antenna check is performed only when the telephone is not used.

(2) As shown in FIG. 3, at the time of the antenna check, the diversity control circuit turns off the high frequency switch connected to the receiving terminal of the portable telephone to stop the diversity reception. First, the main antenna is connected to the transmission / reception terminal of the mobile phone, and the reception level is measured. Measurement of the reception level is provided in the diversity receiver circuit.
This is performed using the reception level detection means obtained.

(3) Next, as shown in FIG. 4, the sub-antenna is connected to the transmission / reception terminal of the portable telephone, and the reception level is measured.

(4) If the reception level when the main antenna is connected to the transmission / reception terminal is extremely poor compared to the sub-antenna (when there is a difference of 7 or more in the reception level value), it is determined that the main antenna has failed. The reception level is 0 to 15, and 7 is intermediate. The threshold value is determined to an appropriate level according to the characteristics of the antenna.

(5) Conversely, if the reception level when the sub-antenna is connected to the transmission / reception terminal is extremely poor compared to the main antenna (when there is a difference of 7 or more in the reception level value), it is determined that the sub-antenna has failed. I do.

Next, a method of checking and selecting an antenna will be described.

(1) If an antenna check is executed during the emergency communication sequence, diversity reception is stopped and the reception performance of the transceiver deteriorates, so the antenna check is not executed. That is, the diversity control circuit turns on the high-frequency switch connected to the reception terminal of the mobile phone to operate the diversity reception.

(2) As shown in FIG. 5, when the emergency communication sequence starts, basically, the main antenna is connected to the transmission / reception terminal of the mobile phone, and the sub antenna is connected to the reception terminal to start the emergency communication sequence. I do.

(3) However, when the main antenna is determined to have failed in the antenna check before the start of the emergency communication sequence, as shown in FIG. 6, the sub antenna is connected to the transmission / reception terminal, and the main antenna is connected to the portable telephone. To start the emergency communication sequence.

(4) After the emergency communication sequence starts, when the in-vehicle device receives an out-of-service display signal from the mobile phone or fails to transmit the emergency communication message, the antenna switching circuit connects the main antenna / sub-antenna to the mobile phone. Reverse the connection and continue the emergency communication sequence.

Finally, the addition of the diversity control signal will be described. It is necessary to add a diversity control signal between the vehicle-mounted device and the transmitting / receiving device. 16pin mobile phone
The terminal assigned to the unused signal line by the I / F is used.

As described above, in the embodiment of the present invention,
An emergency communication antenna is replaced with an emergency communication antenna consisting of a first antenna and a second antenna. The antenna switch is turned off and the reception level is detected to detect a failure of the antenna. When both antennas are normal, diversity reception is performed by two antennas, and when one of the antennas fails, control means for performing transmission and reception by only the normal antenna is provided. It is possible to realize a standby antenna for diversity reception and emergency communication alone.

[0027]

As described above, according to the present invention, the emergency communication antenna is changed to the emergency communication antenna consisting of the first antenna and the second antenna by turning off the antenna switch and detecting the reception level. Detecting a failure of the antenna, performing diversity reception with two antennas when both the first antenna and the second antenna are normal,
When one of the antennas is out of order, the control means for performing transmission and reception with only the normal antenna is provided, so that the effect of realizing the diversity reception and the emergency communication standby antenna with only two antennas is obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an emergency communication antenna according to an embodiment of the present invention;

FIG. 2 is a connection diagram in a normal state of the antenna for emergency communication according to the embodiment of the present invention,

FIG. 3 is a connection diagram at the time of checking the main antenna according to the embodiment of the present invention;

FIG. 4 is a connection diagram at the time of checking an auxiliary antenna according to the embodiment of the present invention;

FIG. 5 is a connection diagram when the main antenna according to the embodiment of the present invention is selected,

FIG. 6 is a connection diagram when a sub-antenna according to the embodiment of the present invention is selected,

FIG. 7 is an explanatory view of a conventional diversity antenna,

FIG. 8 is an explanatory diagram of a conventional backup diversity antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car / mobile phone device 2 Antenna switch 3 Main antenna 4 Secondary antenna

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Nakamura 4-1, Tsunashimahigashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Kazunari Wada Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture 4-3-1, Matsushita Communication Industrial Co., Ltd. (72) Inventor Masahiro Onuki 4-3-9 Toranomon, Minato-ku, Tokyo Daimler-Benz Interservice Telematic Japan Co., Ltd. Masakatsu 4-3-9 Toranomon, Minato-ku, Tokyo Daimler-Benz Interservice Telematic Japan Co., Ltd. (56) References JP-A-9-214391 (JP, A) JP-A-2-13021 (JP, A) JP-A-4-38020 (JP, A) JP-A-1-93936 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04 B 17/00 H04B 7/08 G08B 25/10 H04B 7/26

Claims (1)

(57) [Claims] 1. A first antenna, a second antenna,
A transmission / reception terminal, a reception terminal, antenna switching means for switching connection between the first antenna and the second antenna, and connection between the transmission / reception terminal and the reception terminal, and diversity
Reception level detection means provided in the tee reception circuit
And an antenna selecting means for controlling the antenna switching means, and provided between the receiving terminal and the antenna switching means.
The antenna switch and the antenna switch
To detect the reception level,
Means for detecting a fault, the first antenna and the second
If both antennas are normal, diver with two antennas
City reception and one of the antennas is out of order
Controls to transmit and receive only with a normal antenna
Emergency communication antenna, characterized by comprising a means.