JPH0514960U - Compass device - Google Patents

Abstract

(57) [Summary] [Purpose] It was made possible to receive the radio waves from artificial satellites and measure the current bearing of a moving object with a small error. [Configuration] A satellite-based positioning means for receiving a radio wave from an artificial satellite to measure the current azimuth of a mobile body, and a current azimuth recognition means for recognizing the current azimuth of the mobile body based on the positioning data of the satellite-based positioning means. A reception state detecting means for detecting a deterioration coefficient and an electric field strength based on a radio wave from the artificial satellite; and 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 unit that prohibits recognition of the current direction of the moving body based on the positioning data of the satellite-based positioning unit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an azimuth measuring device which receives radio waves from an artificial satellite and recognizes the current azimuth of a moving body such as a vehicle, a ship, or a flying body.

[0002]

[Prior Art]

 As a conventional azimuth measuring device, there is a system that calculates the azimuth while positioning the earth's magnetic field with a geomagnetic sensor using a fluxgate.

[0003]

[Problems to be solved by the device]

 However, in such a conventional azimuth measuring device, since the system calculates the azimuth while positioning the earth's magnetic field with a geomagnetic sensor using a fluxgate, the deviation (declination) of the earth's magnetic field There is a problem that the error must be corrected at all times because it is affected by the magnetic field (magnetization) of the moving body itself.

The present invention has been made to solve the above problems, and provides an azimuth measuring device capable of measuring the current azimuth error of a moving body by receiving radio waves from an artificial satellite. The purpose is to get.

[0005]

[Means for Solving the Problems]

 An azimuth measuring device according to the present invention includes a current azimuth recognizing means for recognizing a current azimuth of a mobile body on the basis of positioning data of a satellite-based positioning means for receiving a radio wave from an artificial satellite and measuring the current azimuth of the mobile body. Reception state detection means for detecting the deterioration coefficient and electric field strength based on the radio waves from the satellite, and the satellite when the deterioration coefficient detected by the reception state detection means is a predetermined value or more or the electric field strength is a predetermined value or less. It is provided with prohibiting means for prohibiting the recognition of the current direction of the moving body based on the positioning data of the using positioning means.

[0006]

[Action]

 The azimuth measuring device according to the present invention receives the radio wave from the artificial satellite by the satellite-based positioning means, measures the current azimuth of the mobile body, and recognizes the current azimuth of the mobile body by the current azimuth recognition means based on the measured positioning data. In addition, when the deterioration coefficient detected by the reception state detection means based on the radio waves from the artificial satellite is equal to or more than a predetermined value or the electric field strength detected by the reception state detection means is less than the predetermined value, based on the positioning data. This is to prohibit the recognition of the current direction of the moving body.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of the present invention. First, the configuration will be described. In the figure, reference numeral 4 is a satellite-based positioning means, and this satellite-based positioning means 4 is appropriately controlled by a global positioning satellite system (hereinafter abbreviated as GPS) as schematically shown in FIG. Of the 18 to 21 artificial satellites that control the main control station 4a on the ground via, for example, four ground antennas 4b arranged in a distributed manner, four artificial satellites S1 to S4 within the receivable area (field of view) It recognizes the current direction of a moving body such as a ship based on the radio waves transmitted from it.

As shown in FIG. 3, the satellite-based positioning unit 4 measures a current direction of a moving body from a receiver 5 that receives a required artificial satellite signal and the received signal, and obtains a direction signal corresponding to the current direction. And signal processing means 6 for outputting. Further, as shown in FIG. 4, the satellite-based positioning means 4 controls a crystal oscillator 7 which outputs a reference frequency signal which is an overall timing control signal, and the operation timing of the signal processing means 6 from the reference frequency signal. And a clock oscillation circuit 8 for forming a clock signal, and an antenna 9, a preamplifier 10 and a bandpass filter 11 connected to the front stage of the receiver 5.

Reference numeral 12 denotes a current azimuth recognizing device, and the current azimuth recognizing device 12 does not perform azimuth display by a liquid crystal display device, a light emitting diode type display device, a cathode ray tube type display device or the like, a voice output, and an azimuth positioning. It consists of a warning of the time and so on.

Further, the positioning accuracy of the satellite-based positioning means 4 is deteriorated 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. Further, the degree of deterioration of the positioning accuracy in the satellite-based positioning means 4 varies depending on the deterioration coefficient and the electric field strength. The deterioration coefficient in this case is a coefficient that represents the increase in the positioning error determined by the geometrical relationship between the artificial satellite and the moving body at the time of positioning, that is, the positioning state of the artificial satellite with respect to the moving body. Then, if the deterioration coefficient becomes large, the positioning error also increases, and the positioning accuracy decreases. The other cause of the decrease in positioning accuracy is the decrease 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 13 denotes a receiving state detecting means connected to the satellite using positioning means 4, and the receiving state detecting means 13 shows a deterioration coefficient and an electric field strength which are deteriorations in the positioning accuracy of the satellite using positioning means 4. It is something to detect. Deterioration coefficient is obtained from each satellite because the position data of the satellite used during positioning is transmitted from each satellite based on the tracking result of the satellite by the ground antenna 4b and the data of the ground monitor station 4c. The electric field strength can be detected by the strength of the radio wave received from the artificial satellite.

Reference numeral 14 is a prohibiting means, and the prohibiting means 14 measures the position of the satellite position measuring means 4 when the deterioration coefficient detected by the reception state detecting means 13 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 current direction recognition of mobile objects based on data.

Next, the operation will be described. First, the operation of the satellite positioning means 4 will be described with reference to FIG. The satellite-based positioning means 4 calculates positioning data in step ST1, and determines in step ST2 whether or not the current azimuth positioning is possible. Next, in step ST3, if the current azimuth positioning is possible, the azimuth data is output. In step ST4, when the current azimuth position cannot be measured, the position impossible data is output.

Next, the operation of the current azimuth recognizing device 12 will be described with reference to FIG. 6. The current azimuth recognizing device 12 waits for data received from the satellite-based positioning means 4 in step ST5. When it is determined in step ST5 that the received data has been obtained, it is determined in step ST6 whether the received data is azimuth data. When the received data is the azimuth data, the azimuth display and voice output are performed in steps ST7 and ST8. If the data is not positioning data, warning output and voice warning output are performed in steps ST9 and ST10.

[0015]

[Effect of the device]

 As described above, according to the present invention, the present configuration recognizes the current azimuth of the mobile body based on the positioning data of the satellite-based positioning means for receiving the radio wave from the artificial satellite and measuring the current azimuth of the mobile body. The azimuth recognizing means, the receiving state detecting 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 receiving state detecting means is a predetermined value or more or the electric field strength is Since the azimuth measuring device has a prohibition means for prohibiting the recognition of the current direction of the moving body based on the positioning data of the satellite-based positioning means when the value is less than the predetermined value, the current state of the moving body is received by receiving the radio wave from the artificial satellite. The effect is that the azimuth can be measured with a small error.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of an azimuth measuring 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 the compass device of the present invention.

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

FIG. 5 is a flowchart illustrating the operation of satellite positioning means.

FIG. 6 is a flowchart illustrating an operation of a current azimuth recognition unit.

[Explanation of symbols]

 1 Satellite Positioning Means 2 Current Direction Recognition Means 13 Reception State Detection Means 14 Prohibition Means

Claims (1)

[Scope of utility model registration request] 1. A current azimuth recognizing means for recognizing a current azimuth of a mobile body on the basis of positioning data of a satellite-based positioning means for receiving a radio wave from an artificial satellite and measuring the current azimuth of the mobile body,
A reception state detecting means for detecting a deterioration coefficient and an electric field strength based on a radio wave from the artificial satellite; and 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, An azimuth meter device comprising: a prohibition unit that prohibits recognition of the current azimuth of a moving body based on positioning data of a satellite-based positioning unit.