JPH0519976U - Vehicle navigation system - Google Patents

Abstract

(57) [Summary] [Purpose] An inexpensive recognition unit was used to recognize place names without the need for enormous map data. [Structure] Receiving radio waves from an artificial satellite to measure the current position of a vehicle by a satellite-based positioning device unit 1 and recognizing the current position of the vehicle based on the positioning data of the satellite-based positioning device unit. The deterioration coefficient and the electric field strength are detected based on the radio waves from the satellite, and when the detected deterioration coefficient is a predetermined value or more or the electric field strength is a predetermined value or less, the current state of the vehicle based on the positioning data of the satellite-based positioning device section. A calculation unit 3 that prohibits position recognition and that calculates a place name of a place where the vehicle is traveling from the current position of the vehicle measured by the satellite positioning device unit and a recognition unit 6 that recognizes the place name calculated by this calculation unit. It is characterized by being provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle navigation device that receives radio waves from an artificial satellite to recognize the current position of a vehicle.

[0002]

[Prior Art]

 2. Description of the Related Art As a conventional vehicle navigation device, there is one shown in FIG. 5, for example. In the figure, 1 is a satellite-based positioning device that measures the vehicle position, 2 is a data part that stores map data, and 3 is the current position based on the vehicle position and data such as maps from the data part 2. The calculating unit 4 for calculating is a display unit such as a cathode ray tube (CRT) and a liquid crystal display unit (LCD) for displaying the display data calculated by the calculating unit 3.

Next, the operation will be described. The satellite-based positioning device unit 1 receives radio waves from an artificial satellite, and the map data from the data unit 2 is collated with the arithmetic unit 3 to measure the current position of the vehicle. Then, the result calculated by the calculation unit 3 is displayed on the display unit 4.

[0004]

[Problems to be solved by the device]

 However, such a conventional vehicle navigation device requires a huge amount of map data and displays a map using the display unit 4 such as a high-definition CRT or a high-definition dot matrix LCD. However, there is a problem in that the structure of the display unit 4 is expensive because it requires a large amount of map data and is complicated.

The present invention has been made to solve the above problems, and to obtain a vehicle navigation device capable of recognizing a place name by an inexpensive recognition unit without requiring a huge amount of map data. With the goal.

[0006]

[Means for Solving the Problems]

 The vehicle navigation device according to the present invention includes a current position recognizing means for recognizing the current position of the vehicle based on the positioning data of the satellite-based positioning means for receiving the radio wave from the artificial satellite and measuring the current position of the vehicle. The reception state detecting means for detecting the deterioration coefficient and the electric field strength based on the radio wave from the satellite, and the above-mentioned guard when the deterioration coefficient detected by the reception state detecting means is a predetermined value or more or the electric field strength is a predetermined value or less. And a prohibition means for prohibiting the recognition of the current position of the vehicle based on the positioning data of the star-based positioning means, and a computing unit for calculating the place name of the place where the vehicle is traveling from the current position of the vehicle measured by the satellite-based positioning means, and It is characterized in that a recognition unit for recognizing the place name calculated by the calculation unit is provided.

[0007]

[Action]

 The vehicle navigation device in this invention receives radio waves from an artificial satellite to measure the current position of the vehicle by the satellite-based positioning means, and recognizes the current position of the vehicle based on the positioning data of the satellite-based positioning means. Further, the deterioration coefficient and the electric field strength are detected based on the electric wave from the artificial satellite, and when the detected deterioration coefficient is a predetermined value or more or the electric field strength is a predetermined value or less, the positioning data of the satellite-based positioning means is detected. Based on this, the vehicle's current position recognition is prohibited, and a calculation unit for calculating the place name of the place where the vehicle is traveling from the current position of the vehicle measured by the satellite-based positioning means is provided.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. In FIG. 1, the same or equivalent components as those in FIG. First, the structure will be described. In the figure, 5 is a data section in which place name data and the like are stored, 6 is a HUD for displaying display data, and recognition data for LCD or LED display or voice synthesis is output. It is a recognition unit.

Therefore, the satellite-based positioning device unit 1 has, for example, four terrestrial antennas 1b appropriately distributed by a global positioning satellite system (hereinafter abbreviated as GPS) as schematically shown in FIG. Among the 18 to 21 artificial satellites that control the main control station 1a on the ground via the satellite, the current position of the vehicle is determined based on the radio waves transmitted from the four artificial satellites S1 to S4 within the receivable area (field of view). It is something to measure.

As shown in FIG. 3, the satellite-based positioning device unit 1 measures the current position of the vehicle from the receiver 7 that receives the signal of the required artificial satellite and the received signal, and responds to the current position. And a signal processing means 8 for outputting a position signal. Further, as shown in FIG. 4, the satellite-based positioning device section 1 controls a crystal oscillator 9 which outputs a reference frequency signal which is an overall timing control signal, and the operation timing of the signal processing means 8 from the reference frequency signal. A clock oscillation circuit 10 for forming a clock signal is provided, and an antenna 11, a preamplifier 12, and a bandpass filter 13 connected to the preceding stage of the receiver 7 are provided.

Reference numeral 14 denotes a current position recognizing device. The current position recognizing device 14 is a position display by a liquid crystal display device, a light emitting diode type display device, etc., a voice output, a warning generator when the position is not measured, etc. It is composed of and.

Further, the positioning accuracy of the satellite-based positioning device unit 1 is lowered due to the position of the artificial satellite, the movement of the artificial satellite, the state of the ionosphere, and the like, or the positioning cannot be performed locally for a very short time. It may become. Also, obstacles on the ground, such as when driving in a tunnel, may make it difficult or impossible to receive the necessary radio waves. In addition, the degree of deterioration of the positioning accuracy in the satellite-based positioning device unit 1 varies depending on the deterioration coefficient and the electric field strength. The deterioration coefficient in this case is a coefficient that represents an increase in the positioning error determined by the geometrical relationship between the artificial satellite and the vehicle during positioning, that is, the placement state of the artificial satellite with respect to the vehicle. When the deterioration coefficient increases, the positioning error also increases, and the positioning accuracy decreases. The other factor that reduces the positioning accuracy is the reduction in electric field strength. Then, when the deterioration coefficient becomes a predetermined value or more or the electric field strength becomes a predetermined value or less, the positioning error exceeds the allowable amount.

Reference numeral 15 is a reception state detection means connected to the satellite-based positioning device unit 1. The reception state detection unit 15 detects a deterioration coefficient and an electric field strength, which are reductions in the positioning accuracy of the satellite-based positioning device unit 1. To do. The deterioration coefficient is calculated from the satellite position data used for positioning because it is transmitted from each satellite based on the tracking results of the satellite by the ground antenna 1b and the data of the ground monitor station 1c. The electric field strength can be detected by the strength of the radio wave received from the artificial satellite.

Reference numeral 16 denotes a prohibiting means, which prohibits means 16 of the satellite-based positioning device section 1 when the deterioration coefficient detected by the reception state detecting means 15 is equal to or more than a predetermined value or the electric field strength is less than or equal to a predetermined value. Prohibiting the vehicle's current position recognition based on positioning data.

Next, the operation will be described. The satellite-based positioning device unit 1, which is a satellite-based positioning means, always recognizes the current position. The data section 5 also stores place name data. Then, the arithmetic unit 3 obtains the place name data from the data unit 5 by the table look-up method based on the current position obtained from the satellite-based positioning device unit 1, and uses the obtained place name data for HUD / LCD display or voice. Calculate recognition data for synthesis. Then, the recognition unit 6 displays the recognition data or outputs the synthesized voice.

[0016]

[Effect of the device]

 As described above, according to the present invention, the configuration uses the satellite-based positioning means that receives the radio waves from the artificial satellites to measure the current position of the vehicle, and the current vehicle position based on the positioning data of this satellite-based positioning means. A current position recognition means for recognizing the position, a reception state detection means for detecting the deterioration coefficient and the electric field strength based on the radio wave from the artificial satellite, and the deterioration coefficient detected by the reception state detection is a predetermined value or more or When the electric field strength is equal to or lower than a predetermined value, a prohibition means for prohibiting the current position recognition of the vehicle based on the positioning data of the satellite-based positioning means, and a calculation unit for calculating the place name of the traveling place from the current position of the vehicle, Since the vehicle navigation device is equipped with a recognition unit that recognizes the place name calculated by the calculation unit, a huge amount of map data is not required, and the place name can be recognized with an inexpensive recognition unit. The effect is obtained that was made possible identification.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a vehicle navigation device according to the present invention.

FIG. 2 is a perspective view showing an outline of a global positioning satellite system.

FIG. 3 is an overall configuration diagram showing an example of a satellite-based positioning device unit of the present invention.

FIG. 4 is a block diagram showing a satellite-based positioning device unit of the present invention.

FIG. 5 is a configuration block diagram showing an example of a conventional vehicle navigation device.

[Explanation of symbols]

 1 Satellite Positioning Device Section 3 Computing Section 6 Recognition Section 14 Current Position Recognition Means 15 Reception State Detection Means 16 Prohibition Means

Claims (1)

[Scope of utility model registration request] 1. A satellite-based positioning means 1 for measuring the current position of a vehicle by receiving radio waves from an artificial satellite, and a current-position recognition means 14 for recognizing the current position of the vehicle based on the positioning data of the satellite-based positioning means. And a reception state detecting means 15 for detecting the deterioration coefficient and the electric field strength based on the radio wave from the artificial satellite, and the deterioration coefficient detected by the reception state detecting means is a predetermined value or more or the electric field strength is a predetermined value or less. At this time, the prohibition means 16 for prohibiting the recognition of the current position of the vehicle based on the positioning data of the satellite-based positioning means, and the calculation unit 3 for calculating the place name of the place where the vehicle is traveling from the current position of the vehicle
And a recognition unit 6 for recognizing the place name calculated by the calculation unit.