The radio dispatch system of taxi fleets is one of essential transportation means in the present society that is indispensable for daily life. The radio taxi fleet dispatch service to the client location by simply making a telephone call has been offered to the citizens in Japan as well as other major cities in the world. To smoothly perform a radio dispatch, "quick and exact dispatch operations" and "appropriate arrangement of taxi cars in the service area" should be provided. Lately GPS systems are popularized and accurate position information is easily available. For the full performance of GPS-assisted AVM, an advanced data collecting method is indispensable to cope with the trend of "information volume increase" and "reduced time of information updating cycle". Especially in the case of a large-scale dispatch system accommodating more than 200 cars/ch, it is very difficult to maintain the car position accuracy needed for the system operation. This paper proposes new efficient data collection and control technology designed not to disturb voice taxi dispatch operations for the users who manage more than 200 taxi cars per radio channel, based upon the present radio channelization policy assigned to the taxi industry in Japan.
Abstract