JPH0562814U - Altimeter device - Google Patents

Abstract

(57) [Summary] [Purpose] It was made possible to measure the current altitude of a moving object with a small error by receiving radio waves from an artificial satellite. [Structure] A current altitude recognizing means 2 for recognizing the current altitude of a mobile body based on positioning data of a satellite-based positioning means 1 for receiving a radio wave from an artificial satellite and measuring the current altitude of the mobile body,
When the reception state detecting means 13 detects 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. Prohibition means 14 for prohibiting the current altitude recognition of the mobile body based on the positioning data of the satellite-based positioning means.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an altimeter device that receives radio waves from artificial satellites and recognizes the current altitude of moving objects such as helicopters and parachutes.

[0002]

[Prior Art]

 An example of a conventional altimeter device is shown in FIG. In the figure, 1 is an atmospheric pressure detection unit that measures atmospheric pressure, 2 is a calculation unit that calculates the current position altitude data based on the current position pressure data and the sea level pressure data from the atmospheric pressure detection unit 1, and 3 is a calculation unit The display unit displays the altitude of the current position in response to the signal from 2.

Next, the operation will be described. In order to detect the altitude of a moving object such as a helicopter or parachute, the atmospheric pressure value is measured by the atmospheric pressure detection unit 1, the altitude is calculated by the calculation unit 2 based on the signal from this atmospheric pressure detection unit 1, and this calculation unit is calculated. The signal calculated in 2 is input to the display unit 3 to display the altitude of the current position.

[0004]

[Problems to be solved by the device]

 However, in such a conventional altimeter device, since the atmospheric pressure is used to obtain the relative atmospheric pressure difference and convert it to the altitude, the atmospheric pressure at the reference point is not changed. Therefore, there is a problem in that an error is likely to occur because the relative atmospheric pressure difference is obtained while the adjustment is required.

The present invention was made in order to solve the above problems, and provides an altimeter device capable of receiving radio waves from an artificial satellite and measuring the current altitude of a moving object with a small error. The purpose is to get.

[0006]

[Means for Solving the Problems]

 The altimeter device according to the present invention is a current altitude recognizing means for recognizing the current altitude of a mobile body based on positioning data of a satellite-based positioning means for receiving radio waves from an artificial satellite and measuring the current altitude of the mobile body, and the artificial satellite. Reception state detecting means for detecting the deterioration coefficient and electric field strength based on the radio wave from the satellite, and when the deterioration coefficient detected by the reception state detecting means is above a predetermined value or below the predetermined value It is provided with a prohibition means for prohibiting the current altitude recognition of the moving body based on the positioning data of the positioning means.

[0007]

[Action]

 The altimeter device according to the present invention receives radio waves from an artificial satellite by the satellite-based positioning means, measures the current altitude of the mobile body, and recognizes the current altitude of the mobile body by the current altitude recognition means based on the measured positioning data. At the same time, when the deterioration coefficient detected by the reception status detection means based on the radio waves from the artificial satellite is equal to or higher than a predetermined value or the electric field strength detected by the reception status detection means is equal to or lower than the predetermined value, the movement based on the positioning data is performed. It prohibits the current altitude recognition of the body.

[0008]

【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 of all, 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 arranged 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 the four terrestrial antennas 4b arranged in a distributed manner, from the four artificial satellites S1 to S4 within the receivable area (field of view) It measures the current altitude of moving objects such as helicopters and parachutes based on the transmitted radio waves.

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

Reference numeral 12 is a current altitude recognition device, and this current altitude recognition device 12 does not perform altitude display by a liquid crystal display device, a light emitting diode type display device, a cathode ray tube type display device, etc. It consists of a warning of the time and so on.

Further, the positioning accuracy of the satellite-based positioning means 4 is lowered due to the position of the artificial satellite, the movement of the artificial satellite, the state of the ionosphere, or the like, or the positioning is impossible 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 factor in this case is a coefficient that represents the increase in positioning error determined by the geometrical relationship between the artificial satellite and the moving body at the time of positioning, that is, the placement state of the using 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 the positioning accuracy is the decrease in the 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 is a reception state detection means connected to the satellite-based positioning means 4, and the reception state detection means 13 detects deterioration factors and electric field strengths, which are deteriorations in the positioning accuracy of the satellite-based 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-based positioning means 4 when the deterioration coefficient detected by the reception state detecting means 13 is a predetermined value or more or the electric field strength is a predetermined value or less. Prohibit current altitude recognition of mobiles 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 the positioning data in step ST1, and determines in step ST2 whether or not the current altitude positioning is possible. Next, in step ST3, if the current altitude positioning is possible, altitude data is output. In step ST4, if the current altitude positioning is impossible, the positioning impossible data is output.

Next, the operation of the current altitude recognition device 12 will be described with reference to FIG. 6. The current altitude recognition device 12 waits for the 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 altitude data. If the received data is altitude data, altitude 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 step ST9 and step ST10.

[0016]

[Effect of the device]

 As described above, according to the present invention, the present configuration recognizes the current altitude of the mobile body based on the positioning data of the satellite-based positioning means that receives the radio wave from the artificial satellite and measures the current altitude of the mobile body. The altitude recognition means, the 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 means is a predetermined value or more or the electric field strength is When the value is less than a predetermined value, the altimeter device is equipped with a prohibition unit that prohibits the current altitude recognition of the moving body based on the positioning data of the satellite-based positioning means, so the current altitude of the moving body is received by receiving the radio waves from the artificial satellite. Is obtained with a small error.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of an altimeter 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 an altimeter 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 altitude recognition unit.

FIG. 7 is a configuration block diagram showing an example of a conventional altimeter device.

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A current altitude recognizing means for recognizing a current altitude 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 a current altitude of the mobile body. A reception state detecting means for detecting the deterioration coefficient and the electric field strength on the basis of the radio wave; and the satellite-based positioning means 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 altimeter device including a prohibition unit that prohibits the current altitude recognition of a moving body based on positioning data.