JPS62111532A - Transmission decentralized type display system for automobile position - Google Patents

Abstract

PURPOSE:To collect a nearly prescribed number of idle vehicle data at a central managing room by using the sensitivity of a sign post receiver mounted on a vehicle with a remote control signal from a base station. CONSTITUTION:A base station sends a remote control signal to switch the sensitivity of a sign post receiver 2-1 from a generator 4-1 as required via a communication radio system 4. A vehicle uses a receiver 3-0 of a communication radio system 3 to receive the remote control signal and gives it to a processor 3-2. Then the decoded signal is processed into a form of a control signal by a reception sensitivity controller 2-4 and given to an electronic control attenuator 2-0 to switch the attenuation. Thus, even when the transmission output of the district sign post 1 is constant, the reception sensitivity of the sign post reception system of the vehicle is changed, resulting that the arrival effective range of a radio wave is changed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to an AVM (Automation CVehiel) system that can monitor the operation status of a large number of vehicles such as taxis in a central control room and streamline operation management.
The present invention relates to a distributed transmission type automobile position display system to which the e-Monitoring method is applied.

[Prior art]

This kind of conventional transmission distributed automatic vehicle position display system is
Low-output radio transmitters called signposts are placed in each target area, and these signposts constantly transmit position signals for the area. On the other hand, a single station (mobile station) equipped with a radio for communicating with the base station receives the above sign post signal, and... 1. Don't process everything, but the recipient's name is υ [J, and this υ”) When both I approach the signature bust, the first one will be sent (No. 6's receiver will not be transmitting from the signature post). Decipher and memorize all signals received.After that, when the vehicle receives a signal requesting data collection from the base station, it will receive the above memorized position signal and its own weight. The vehicle number, etc. is automatically sent back to the base station.When the base station receives the return signal from the vehicle, it processes the signal and displays the -C position and vehicle number (-1). Vehicles belonging to
In addition to grasping the situation, communication wireless systems k', R
The system was designed to provide necessary instructions and communications.

. [Problem to be solved by the invention] In such a conventional system, Sai,/Boss 1
The transmit power of and the Signvost receiver a x, 5 degrees (j
Since it is constant, the range in which the sign post signal can be received is also constant. About this.

It is not appropriate for certain types of business operations. for example.

In Takun operations, the number and roundness distribution in the air varies greatly depending on the time of day. ) ('"lchi, +t' at busy times!
There are few empty cars, and they are widely scattered5.During off-peak hours, there are many empty cars, and they tend to concentrate in several specific areas. For this reason, during busy times there is a high probability that there will be no empty cars within the effective range of the sign post I, and during off-peak times there will be a large number of empty cars within the effective range of the sign post.

Therefore, an object of the present invention is to control the entire effective reception range of sign post signals.

To provide a transmission distributed type automobile position display system capable of distributing many empty cars in an area during busy times and reducing the number of empty cars during quiet times.

[Means for solving problems]

The transmission distributed motor vehicle position indicating system according to the present invention comprises:
A mobile station vehicle equipped with a plurality of distributed sign posts and a sign post receiver 2 that is close to one of these district sign posts and receives all the position signals transmitted from the corresponding sign post. a base station wireless device that communicates between the wireless device and the tun lfi line device;
The in-vehicle wireless device is configured to return the signpost's (i ``It times signal duplex identification signal'', il (-
,” in the system, the base station wireless device has a remote
:'J, I signal generator is provided, and the vehicle radio device:
′? C reception sensitivity; b1] A value I device is provided, and the vehicle radio device.

Upon receiving the remote control signal of the remote side No. 3 generator transmitted from the line supply equipment (the base station), the remote side: 51
The present invention is characterized in that, in addition to decoding all of the first signal and adding it to the reception sensitivity controller, the reception sensitivity of the Signbost receiver is controlled by the output of the reception sensitivity controller.

[Embodiments of the invention]

Next, an embodiment of the automobile position system according to the present invention will be described with reference to one drawing.

FIG. 1 is a block diagram showing the configuration of an actual example according to the present invention. In this figure, 1 is a sign post, 2 is a sign post receiving system for heavy vehicles, and 3 is a communication system for vehicles with base roads. 4 is the wireless system of the base station.Furthermore, 2-
2-1 is the signpost signal receiver, 2-2 is the signpost No. 4i memory, 2-3
is a data signal generator, 2-4 is a receiving sensitivity controller, 6-O
is a communication radio receiver, 3-1 is a communication radio transmitter, 3-
2 is a remote control signal processor, and 4-0 is a communication radio transmitter.

4-1 is a remote control signal generator, 4-2 is a communication radio receiver, and 4-3 is a data processing display.

In such a configuration, the base station sends out one remote control word for switching the sensitivity of the sign post receiver 2-1 from the remote control signal 4-1 via the communication wireless line as necessary. There are several types of this signal, each corresponding to a sensitivity that can be changed in stages, and may be in tone or digital form. On the vehicle side, when the communication wireless thread receiver 3-0 receives the remote control signal, the signal is given to the remote control signal processor 3-2. Then, since it is decoded here, it is processed in the form of a control signal by the receiving sensitivity controller 2-4, and is given to the electronically controlled attenuator 2-0. The electronically controlled reducing tableware 2-0 switches the amount of attenuation according to the control signal.

As a result, even if the transmission output of the district sign post 1 is constant, the receiving sensitivity of the sign post receiving system of the vehicle changes, and as a result, the effective range of radio waves is changed. FIG. 2 shows the characteristics of the received electric field strength versus the effective distance range that can be changed by controlling the reception sensitivity in this manner. Namely.

If the amount of attenuation of the electronically controlled attenuator 2-0 is small, the effective range will be widened, and the number of vehicles that can fit in it will increase. subject to restrictions.

In the above embodiment, the attenuator 2-0 may have nine mechanically movable parts as long as they can be controlled electronically, and the amount of change may be continuous or stepwise. Also, in FIG.

The common functional circuits applied to current transmit distributed AVMs are shown only in outline. In particular, the audio part of the reliable wireless system is omitted because it is not directly related to the features of the present invention.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the reception sensitivity of the signpost receiver mounted on the vehicle is controlled in response to a remote control signal from the base station, thereby controlling the radio waves transmitted from the signpost. The effective reach range can be adjusted as needed.8 For example, when applied to taxi services, there may be too many empty cars depending on the time of day.

The central control room can collect data on a certain number of empty cars without ever having too little data.

The effects obtained are profound.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention;
FIG. 2 is a graph showing the characteristics of the received electric field strength versus the reach range in the Signbost receiver. In the figure, 1 is a sign post, 2 is a sign post receiver, 3 is a communication radio system, 4 is a base station radio system, 2-0 is an electronically controlled attenuator, 2-1 is a sign post signal receiver, 2-
2 is a sign post signal memo! J, 2-3 is a data signal generator, 2-4 is a receiving sensitivity controller, 3-0 is a radio receiver for communication, 3-1 is an f@ line transmitter for communication, 3-2 is a remote control signal processing vessel. 4-0 is a radio transmitter for communication, 4-1 is a remote control signal generator, 4-2 is a radio receiver for communication, and 4-3 is a data processing display. , Attorney Ding (7783) Attorney ±) Noriyasu Yata ′, ′−゛. -mu,・′

Claims (1)

[Claims] 1. A mobile device equipped with a plurality of distributed sign posts and a sign post receiver that is close to one of these district sign posts and receives the position signal sent from the corresponding sign post. a station vehicle radio device;
and a base station wireless device that communicates with the vehicle wireless device, so that the vehicle wireless device returns a position signal and a vehicle identification signal of the sign post in response to a request from the base station wireless device. In the communication system, the base station wireless device is provided with a remote control signal generator, the vehicle wireless device is provided with a reception sensitivity controller, and the vehicle wireless device is configured to receive the remote signal transmitted from the base station wireless device. When a remote control signal from the control signal generator is received, the remote control signal is decoded and added to the reception sensitivity controller, and the reception sensitivity of the sign post receiver is controlled by the output of the reception sensitivity controller. A transmission distributed type automobile position display system characterized by: