JPH11284553A - Antenna diagnostic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To diagnose whether either ore has a failure between two antennas that perform diversity receiving. SOLUTION: An antenna for emergency communication, consisting of a main antenna 3 and a sub-antenna 4, is provided with an antenna switch circuit 2 and an antenna switch 5 that is turned on and off by a diversity control signal. It is detected if either antenna has a failure between the antennas 3 and 4, by turning off the switch 5 and measuring the receiving level of only the antenna 3 or only the antenna 4. When both the antennas 3 and 4 are normal, the two antennas perform diversity receiving, and when one antenna fails, transmission and reception are conducted with only the normal antenna.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna diagnostic apparatus, and more particularly, to an antenna diagnostic apparatus for diagnosing the abnormality of two antennas.

[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 (support call to service center): Requests rescue 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. .

In the digital car / mobile phone system in Japan, as shown in FIG. 7, two antennas are installed, one antenna is used for transmission, and the reception is switched to a higher reception level, so-called diversity reception. You are using the 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, and a large installation space is required. However, the two spare antennas were not used except at the time of failure, and were useless. Further, in the case of performing diversity reception using only two antennas, there is a problem that transmission becomes impossible when the transmission / reception antenna fails.

An object of the present invention is to provide a means for detecting a failure of an antenna when diversity reception is performed with two antennas.

[0008]

According to the present invention, in order to solve the above-mentioned problems, an antenna diagnostic apparatus includes a first antenna, a second antenna, a transmitting / receiving terminal and a receiving-only terminal of a portable telephone, and a first antenna. Antenna switching means provided between the antenna and the second antenna, a reception level detection means, an antenna selection means for controlling the antenna switching means, and an antenna switch between the reception-only terminal and the antenna switching means. The configuration was provided. With such a configuration, the antenna switch can be turned off and the reception level detected to detect a failure of the antenna.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention comprises a first antenna, a second antenna, a transmission / reception terminal and a reception only terminal of a portable telephone, the first antenna and the second antenna. Antenna switching means provided between the antenna switching means, reception level detection means, antenna selection means for controlling the antenna switching means, and an antenna switch provided between the reception-only terminal and the antenna switching means. And an antenna diagnostic device comprising means for detecting a failure of an antenna by detecting a reception level by turning off the antenna switch, and has an effect that a failure of one of the diversity antennas can be detected. .

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) In an embodiment of the present invention, a failure of an antenna is detected by turning off an antenna switch provided between a reception-only terminal of a portable telephone and an antenna switching means and detecting a reception level. This is an antenna diagnostic device for detecting.

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. Normally, transmission is performed using the main antenna 3 and diversity reception is performed using the antennas 3 and 4. If the main antenna 3 fails,
Transmission and reception are performed using the sub antenna 4.

In the case of a single diversity configuration, an antenna having a high reception level is automatically selected and received by a diversity reception circuit built in the mobile phone.
Even if an antenna is selected by an antenna selection circuit outside the mobile phone, the quality of the antenna cannot be detected. Therefore, a high-frequency switch 5 for stopping diversity reception is added between the antenna switching circuit 2 and the receiving terminal 7. The specific antenna check method is as follows.

(1) As shown in FIG. 2, except when the antenna is checked (normal time), a high frequency switch 5 connected to the receiving terminal 7 of the portable telephone 1 by a diversity control signal.
Is turned ON to operate the diversity reception. That is, an antenna having a high reception level is automatically selected by the diversity reception function inside the mobile phone. When the antenna check is executed, 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 antenna check, the cellular phone 1 is controlled by a diversity control signal.
Turn off the high frequency switch 5 connected to the receiving terminal 7
To stop diversity reception. First, the main antenna 3 is connected to the transmission / reception terminal 6 of the mobile phone 1, and the reception level is measured.

(3) Next, as shown in FIG. 4, the sub antenna 4 is connected to the transmission / reception terminal 6 of the portable telephone 1, and the reception level is measured.

(4) If the reception level when the main antenna 3 is connected to the transmission / reception terminal 6 is extremely poor compared to the sub-antenna 4 (when the reception level value is 0 to 15, there is a difference of 7 or more). Time) It is determined that the main antenna 3 has failed.

(5) Conversely, if the reception level when the sub-antenna 4 is connected to the transmission / reception terminal 6 is extremely poor compared to the main antenna 3 (when there is a difference of 7 or more in the reception level value), the sub-antenna 4 Is determined to be a failure.

As described above, in the embodiment of the present invention,
Since the antenna diagnostic device is configured to detect the reception level by turning off the antenna switch provided between the reception-only terminal of the mobile phone and the antenna switching means, it is possible to detect which of the two antennas has failed. can do.

[0020]

As described above, according to the present invention, in the antenna diagnostic apparatus, the antenna switching means is provided between the transmission / reception terminal and the reception-only terminal of the portable telephone and the main antenna and the sub-antenna, and the reception-only terminal and the antenna switching Since the reception level is detected by turning off the antenna switch provided between the antenna and the means, it is possible to easily detect which of the two antennas is out of order.

[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 telephone device 2 Antenna switch 3 Main antenna 4 Secondary antenna 5 Antenna switch 6 Transmit / receive terminal 7 Receive terminal

Continued on the front page (72) Inventor Kazuya Wada 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd.

Claims (1)

[Claims] 1. A first antenna, a second antenna,
A transmitting / receiving terminal and a receiving-only terminal of the mobile phone and the first terminal;
Antenna switching means provided between the first antenna and the second antenna, a reception level detection means, an antenna selection means for controlling the antenna switching means, and an antenna switching means between the reception-only terminal and the antenna switching means. An antenna diagnostic apparatus, comprising: an antenna switch provided in an antenna switch; and means for detecting a reception level by turning off the antenna switch to detect a failure of the antenna.