JP2969546B2 - Position management method of mobile unit equipped with GPS receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position management system of a mobile unit having a GPS receiver, for example, a ship, and more particularly to a method of colliding positioning data from a plurality of mobile units existing in a specific area to a base station. It relates to an improvement to enable transmission without any problem.

[0002]

2. Description of the Related Art Recently, GPS (Global Posi) has been developed.
2. Description of the Related Art A system that manages the positions of a plurality of moving objects in a specific area using a Tying System receiver has been applied to various fields. For example, an area determined by the transmission distance of a transmission radio wave is set on the sea, and a plurality of small vessels registered in advance that move within the area, for example, a yacht is equipped with a GPS receiver and a radio, and positioning data is installed on the ground. A method is known in which the position of a small vessel in an area is managed in the base station by transmitting the signal to the base station.

In order to manage the positions of a plurality of mobile units existing in an area by a base station, data is periodically collected from each mobile unit by polling from the base station.
A method is employed in which positioning data is periodically transmitted by shifting the radio wave emission time from the wireless device of each mobile by an internal clock provided in the mobile.

[0004]

However, the above method is difficult to manage a large number of moving objects in a limited time.
Radio control is complicated and time-consuming,
There is a drawback in that it takes a long time for the remaining heat from when the wireless device is turned on by a call from the base station to when the wireless device is actually put into an operation state. On the other hand, in the above method, if the time of the internal clock is shifted, the radio wave emission time of the wireless device may overlap with the radio wave emission time of the wireless device mounted on another moving object. Has to be reset for each moving object each time.

In addition, since it is inevitable that positioning data using a GPS receiver includes an error, position management must be performed with limited accuracy.

[0006] Therefore, a main object of the present invention is to enable positioning data of a plurality of moving objects in a specific area to be taken into a base station as much as possible within a fixed time without collision. .

Another object of the present invention is to provide a position management system for a moving object that can improve the position measurement accuracy.

[0008]

According to the present invention, a base station manages the positions of a plurality of mobile units present in a predetermined area by receiving positioning data periodically transmitted from each mobile unit. In the position management method of the moving body
Each of the mobile units is connected to the GPS receiver for outputting a signal including the positioning data and the standard time data, and is connected to the GPS receiver to process the positioning data. A data output device for determining the transmission time of the positioning data based on the assigned ID data so as not to overlap with the transmission time of the positioning data from another moving object in the area; and a connection to the data output device. And a wireless device for transmitting the positioning data at the determined time.

It is to be noted that the data output device is provided with the GPS
A signal processing device that extracts the positioning data from a signal from a receiver and converts it into a signal suitable for transmission and outputs the signal, and extracts and outputs the standard time data, and a signal processing device that is assigned to each mobile object in advance. An input unit for ID data, and a transmission time determination unit that determines a transmission time of the positioning data based on the standard time data from the signal processing device according to the ID data input from the input unit. ing.

The ID data is allocated to and held by a predetermined number of ID cards, and includes data indicating a transmission order of the positioning data. The input unit transmits the ID data from the ID card. It has a reading means.

On the other hand, as for the base station, a radio device for receiving positioning data transmitted from each of the mobile units, and a data processing device for processing the received positioning data and managing the position of each of the mobile units are provided. Provided, but general GP
In the case where accuracy of S or higher is required, the fact that the positioning data from the GPS receiver includes satellite data indicating the received satellite is used, and in addition to the above-described components, the fixed point positioning of the own station is performed. And a GPS receiver for calculating the position correction amount for the positioning data from each of the moving objects based on the fixed point positioning data and the previously input reference position data, and outputting the position correction amount to the data processing device. And a differential GPS (Differential GPS) processing unit. In this case, the DGPS processing unit
A plurality of types of fixed point positioning data for each satellite are received from the PS receiver, and the position correction amount is calculated and output for each satellite. After the received satellite is identified, the position of each mobile unit is corrected by the position correction amount corresponding to the identified satellite.

[0012]

According to the present invention, time information is obtained from reception data (standard time data) of a GPS receiver, and based on the standard time data and ID data (identification number, etc.) assigned in advance to the mobile unit. The positioning data transmission time of each mobile unit is automatically distributed within a fixed time.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where the embodiment of the present invention is applied to position management of a small boat will be described below with reference to the drawings. FIG.
1 shows one small boat 10 and a base station 20, but a specific area with a radius of about several tens of kilometers is actually set on the sea, and a large number of small boats exist in this specific area. . The small vessel 10 has a GPS receiver 1
1, a data output device 12, and a wireless device 13 for transmitting positioning data are mounted. In addition, the range of the specific area is
It is determined by the range of radio waves of the wireless device 13.

On the other hand, the base station 20 comprises a radio 21 for receiving data from the small boat 10, a signal converter 22, a data processor 23 for processing the converted data and centrally managing the measured data and displaying the measured data. The data processing device 23 can use a personal computer having a printer, a display, and the like. In addition, the small boat 10, the base station 2
0 may actually include components such as a relay amplifier in addition to the above components.

As is well known, the GPS receiver 11 has a signal receiving function of a plurality of channels, receives positioning data and standard time data from GPS satellites, and outputs the data to the data output device 12. The data output device 12 converts the positioning data (serial data) into an FSK signal suitable for transmission, and converts the positioning data (serial data) into an FSK signal based on ID data given by manual operation and standard time data from the GPS receiver 11. The transmission time of the positioning data is determined, and the data transmission wireless device 13 transmits the positioning data. Similarly, other small vessels determine the transmission time of the positioning data and transmit their own positioning data, but these transmission times are determined in a time-series manner so as not to overlap by a method described later.

In the base station 20, a plurality of types of positioning data which are scattered and emitted in time series are sequentially received by the radio device 21 and output to the signal conversion device 22. Signal converter 22
Then, the FSK signal is converted into a serial signal (RS-232C) and sent to the data processing device 23.

FIG. 2 shows in detail the configuration of the small boat side of FIG. 1. The data output device 12 is a signal processing device 12-.
1, an ID setting unit 12-2 and a transmission time determination unit 12-3. The signal processing device 12-1 is a GPS receiver 11
The standard time data included in the GPS reception signal received in the step is extracted and output to the transmission time determination unit 12-3.
The positioning data is extracted and framed for data to be sent to the wireless device 13. The framed positioning data is converted into an FSK signal and output to the wireless device 13. The transmission time determination unit 12-3 uses the ID setting unit 12-2 to determine whether the small boat 1
Data assigned to ID data 0 and the signal processing device 12-1
The transmission time of the positioning data is set based on the standard time data given from.

An example of a method for determining the transmission time in the transmission time setting section 12-3 will be described below. Here, assuming that a maximum of N small boats can exist in a specific area, ID data corresponding to each of the N small boats is prepared.
A D number is assigned. This ID data also contains N
Data indicating the transmission order of one small boat is included. Then, such ID data is given to the ID card by magnetic recording, IC memory, or the like, and the ID card is given to the boat operator. For this reason, the ID setting section 12-2 has a means for reading the ID data given to the ID card as an ID data input section, but such a reading means is well known and will not be described.

The operator sets the ID card in the ID setting section 12-2.
Is set, the ID setting unit 12-2 reads the ID data assigned to the ID card and identifies whether the data is legitimate data. Then, when it is determined that the data is legitimate data, the data indicating the transmission order is read and output to the transmission time determination unit 12-3.

In the transmission time determination unit 12-3, the maximum number N of ID data and the transmission cycle of positioning data are set in advance at a fixed cycle T (for example, 5 minutes, 10 minutes).
When receiving the data indicating the transmission order from the setting unit 12-2, it determines the transmission time of the positioning data based on this data and the standard time data from the signal processing device 12-1. For example, assuming that N is 30, the fixed period T is 5 minutes, the transmission time of the positioning data is 5 seconds, and the current standard time is exactly 15:00 for easy understanding, 0 minute of each time from 0:00 to 24:00. On the basis of 0 second, if the data indicating the transmission order is the tenth, the transmission time determination unit 12-3 determines the first transmission time to be 15:00:50, and the second transmission time is The transmission time is determined such as 15:05:50 five minutes later, and a transmission command is output to the wireless device 13 at this time. In the wireless device 13, the transmission time determination unit 12-3
When the transmission command is received from the CPU, the positioning data from the signal processing device 12-1 is transmitted for only 5 seconds. The above numerical values are for the case where the transmission time of a certain order and the transmission time of the next order are continuous. However, a certain time interval may be provided between them, and in this case, a plurality of small The positioning data is intermittently received from the ship.

Similarly, in another small boat on which another ID card is set, the transmission time is determined in accordance with the data indicating the transmission order. Therefore, the transmission times do not overlap. In the base station 20, the data processing device 23 processes a plurality of types of positioning data from a plurality of small vessels in a known manner, stores the processed data in a storage device, and displays a plurality of small-sized data on a display based on the processed data. Displays the position of the ship. In the data processing device 23,
The wake of each small boat is displayed or printed out based on the data stored according to the mode designation from the key input unit.

In the above description, data indicating the transmission order is added in addition to the ID number. However, the ID number itself may be determined in advance so as to indicate the transmission order. In this case, the ID setting unit 12-2 may include a key input unit without using an ID card.
That is, the ID number is given to the operator at the time of boarding, and when the operator enters the ID number using the key input unit after boarding, the ID setting unit 12-2 automatically determines the transmission order from this ID number. Then, the transmission time of the positioning data is determined in the same manner as described above.

FIG. 3 shows another embodiment of the present invention, in which the accuracy of positioning is improved. The base station 20 'manages the position at a fixed point. However, the GPS receiver cannot avoid an error of about several tens of meters to 100 meters due to propagation and other factors. In order to correct such an error, in addition to the components shown in FIG. 1, a GPS receiver 2 having a signal receiving function of a plurality of channels for performing fixed-point positioning of the position of the own station is provided.
4. It has a DGPS (Differential GPS) processing unit 25 for calculating the position correction amount of each small vessel based on the positioning data of the own station and the reference position data of the own station input in advance, and calculates the calculated position correction. The amount is output to the data processing device 23 '. The data processing device 23 'corrects the display position of each small boat based on the position correction amount. Such a data processing device 23 'can also use a personal computer.

Here, there are a large number of GPS satellites, and the GPS receiver in each small vessel has a function of receiving a plurality of channels and receives signals from a plurality of satellites. It is not always the case that the positioning data is output using this information. For this reason, strictly speaking, the error in the positioning data differs for each satellite, and the calculation of the position correction amount is preferably performed for each satellite from the viewpoint of improving the accuracy of the position correction. And, usually, the positioning data from each small vessel and the GPS at the base station 20 '
Each of the fixed point positioning data from the receiver 24 includes satellite data indicating the received satellite. So, DG
The PS processing unit 25 receives fixed point positioning data for each of a plurality of types of satellites from the GPS receiver 24, and calculates and outputs the position correction amount corresponding to the satellite. On the other hand, the data processing device 2
3 ′ identifies the satellite received by each small vessel from the satellite data included in the positioning data from each small vessel, and calculates the position of each small vessel by the position correction amount corresponding to the identified satellite. Is corrected.

With the above-described configuration, the base station 20 'sequentially receives a plurality of types of positioning data which are scattered and emitted in time series and transmitted by the radio equipment 21 in the same manner as in the above embodiment, Output to The signal converter 22 converts the FSK signal into a serial signal (RS-232C) and sends it to the data processor 23 '. In the base station 20 ', the GPS receiver 24 also performs fixed-time fixed-point positioning, and outputs positioning data of the own station corresponding to the satellite to the DGPS processing unit 25. The DGPS processing unit 25 calculates the position correction amount for each satellite based on the positioning data and the reference position data for each satellite, and outputs the calculated position correction amount for each satellite to the data processing device 23 '. Accordingly, the data processing device 23 'performs the position correction of each small boat based on the position correction amount for each satellite, and displays the corrected position of each small boat. Note that the signal from the signal conversion device 22 is output to the DGPS processing unit 25 so that the DGP
The position correction process may be performed by the S processing unit 25, and the correction result may be output to the data processing device 23 'and displayed.

In the above embodiment, the case where the moving body is a small boat has been described. However, the field of application of the present invention is not only a moving body on the sea but also a moving body moving within a specific area set on the ground, for example, a vehicle. It goes without saying that the present invention can be applied to such position management.

[0027]

As described above, according to the present invention, the means for determining the transmission time so that the transmission times of the positioning data from a plurality of mobiles do not overlap with each other is provided. There is no need to specify, and no internal timer is required. On the other hand, the base station does not need to control the transmission and reception of multiple mobile units, and can collect more mobile unit location information within a fixed time, which greatly simplifies the hardware and software for data processing on the base station side. Since it can be simplified and no adjustment is required, the manufacturing process of the device can be simplified, and long-term measurement reliability can be obtained. Moreover, to the base station,
By providing a means for correcting the error of the GPS receiver, highly accurate position management can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a location management method according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration on the moving body side shown in FIG. 1;

FIG. 3 is a schematic block diagram of a location management method according to another embodiment of the present invention.

[Explanation of symbols]

 10 Small boat 20, 20 'Base station

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-328430 (JP, A) JP-A-3-73877 (JP, A) JP-A-6-3431 (JP, A) 150927 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) G01S 5/00-5/14 H04B 7/24-7/26 H04Q 7/00-7/04

Claims (4)

(57) [Claims] 1. A position management method for a mobile unit in which the positions of a plurality of mobile units present in a predetermined area are managed by a base station by receiving positioning data periodically transmitted from each mobile unit. , Each of the mobile units outputs a signal including the positioning data and the standard time data.
A receiver, connected to the GPS receiver, for processing the positioning data, and based on the standard time data and the ID data assigned to each mobile, the mobile station from another mobile in the area. A data output device that determines the transmission time of the positioning data so as not to overlap with the transmission time of the positioning data; and a wireless device that is connected to the data output device and transmits the positioning data at the determined time. A position management method for a mobile object provided with a GPS receiver. 2. The position management method according to claim 1, wherein
The data output device is a signal processing device that extracts the positioning data from the signal from the GPS receiver, converts the positioning data into a signal suitable for transmission, and outputs the signal, and extracts and outputs the standard time data. A transmission time of the positioning data is determined based on the input unit of the ID data assigned to the moving object in advance and the standard time data from the signal processing device according to the ID data input from the input unit. Characterized in that the transmission time deciding section is provided.
A position management method for a mobile body provided with an S receiver. 3. The location management system according to claim 2, wherein
The ID data is allocated to and held by a predetermined number of ID cards, and includes data indicating a transmission order of the positioning data, and the input unit has means for reading the ID data from the ID card. A position management method for a mobile object provided with a GPS receiver. 4. The location management system according to claim 1, wherein
The base station is a wireless device that receives positioning data transmitted from each of the mobile units, a data processing device that processes the received positioning data to manage the position of each of the mobile units, and performs fixed point positioning of its own station. A GPS receiver for performing the calculation, and a DGPS (differential) for calculating a position correction amount for the positioning data from each of the moving objects based on the fixed-point positioning data and the previously input reference position data and outputting the calculated position correction amount to the data processing device. A GPS (GPS) processing unit, wherein the positioning data from each of the mobile units and the fixed point positioning data from the GPS receiver in the base station each include satellite data indicating a received satellite, and the DGPS processing unit In the above, the fixed point positioning data for each of a plurality of types of satellites is received from the GPS receiver, the position correction amount is calculated and output for each satellite, and the data processing is performed. The apparatus identifies a satellite received by each mobile unit with respect to positioning data from each mobile unit, and corrects the position of each mobile unit by the position correction amount corresponding to the identified satellite. A location management system for a mobile unit equipped with a GPS receiver.