JPS62185183A - Apparatus for measuring bearing and speed - Google Patents

Abstract

PURPOSE:To attain to enhance the reliability in the measurement of an bearing and a speed, by receiving a satellite radiowave by two GPS receivers and measuring a moving azimuth and a moving speed to perform operational processing. CONSTITUTION:A first antenna 1 is arranged on the line connecting the bow and the stern in the vicinity of the bow and a second antenna 4 is arranged in the vicinity of the stern. The signals of four GPS satellites received by the antenna 1 are supplied to a first GPS receiver 2 and the moving speed V1 and moving bearing alpha of the antenna 1 are measured to be supplied to an operator 3. At the same time the signals of four GPS satellites received by the antenna 4 are supplied to a second GPS receiver 5 and the moving speed V4 and moving bearing beta of the antenna 4 are measured to be supplied to the operator 3. The operator 3 calculates a bow bearing theta, a bow direction moving speed V1H, the lateral direction moving speed V1T in the bow side and the lateral direction moving speed V4T in the stern side from the speeds V1, V2 and the bearings alpha, beta to display the same on a display device. Because the rotation earth magnetism of the earth is not utilized in this measurement, measurement can be performed even in the polar regions and the measurement of the bearing and the speed is enabled with high reliability.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention uses GPS radio waves to measure the bow (nose) direction of a moving object such as a ship or airplane, and also to measure the direction of the bow (nose) of a moving object such as a ship or airplane. This invention relates to a device for measuring velocity and moving velocity in a direction perpendicular to velocity.

(Prior technology) Traditionally, there have been gyro compasses and magnetic compasses as devices for measuring the nose of a ship (aircraft). Because it pointed, it could not be used in polar regions.

Additionally, there were speed measuring devices such as Doppler logs and Doppler radars, but both required transmitters and were therefore expensive.

Furthermore, there was no device that could give both direction and speed at the same time.

(Problem to be solved by the invention) To measure the direction of a moving object, it is not effective in polar regions to use means that detect the earth's rotation and the horizontal component of the earth's magnetism.
Moreover, an expensive transmitter was required for the speed of 1fl+ constant.

There has been a demand for a scale that can simultaneously and accurately measure the 4111 constants of heading and speed, and for an inexpensive measuring device.

(Means for Solving the Problems) The present invention measures the bow (head) direction by receiving radio waves emitted by GPS satellites using two GPS receivers, and
It is a device that measures the speed of movement in the direction of the bow (nose) and the speed of movement in the direction perpendicular to it. Its purpose is to provide the heading and speed at the same time without the need for an expensive transmitter, and to provide d111 measurement even in polar regions. The object of the present invention is to realize a highly reliable and inexpensive direction and speed measuring device that does not become unstable. Below 1
This will be explained using drawings.

(Embodiment) FIG. 1 shows a block diagram of an embodiment of the present invention, where l is a first antenna and 2 is a first GPS receiver.

3 is a computing unit, 4 is a second antenna, 5 is a second GPS receiver, and 6 is a display device. Here, the first antenna l is installed near the bow on a line connecting the bow and stern, and the second antenna 4 is installed near the stern.

Next, to explain this operation, the signals of at least four GPS satellites received by the antenna 1 of @l are sent to the first GPS receiver 2, and the moving speed V1 and moving direction of the first antenna 1 are Define α as it+ll. still.

It is well known that many existing GPS receivers can measure the speed and heading of an antenna.

The explanation will be omitted here. The first GPS receiver 2 sends the measured moving speed vl and moving direction α to the first input terminal of the computing unit 3. At the same time '7v, 2 antennas 4
transmits the signal of at least one GPS satellite received by the second GPS receiver 5 to the moving speed v of the second antenna 4.
4 and the moving direction β. The second GPS receiver 5 sends the moving speed V4 and the moving direction β, which are fixed at 4 (11), to the second input terminal of the computing unit 3.
The moving speed v1 of the first air IT transmitted to the input terminal of
From the moving direction α and the moving speed v4 and moving direction β of the second antenna 4 transmitted to the second input terminal, the ship's heading 0. Bow direction movement speed Vl,,=V4. ．． , the lateral movement speed of the bow side V, T, the lateral movement speed of the stern 1111 7
4 is calculated and displayed on the display 6 as a numerical value or a vector.

The calculation contents of the calculation unit 3 will be explained with reference to Figure @2. From Figure 2 + ``For both IH and V2O, the hull is at the front (
Since it is the speed at which the vehicle moves backward), vlH = ■4H.

Therefore, Vlcos(θ-α)=V4cos(0-
β), vl, α, v4. Since β is all known, the calculator 3 can calculate the heading θ by solving this equation. This 0 is V 1+i =V1 co
By substituting s (0-α), the speed of movement in the bow direction V
■ is calculated. Further+cVIT=V1sin(0-α)
*V4T=V4 sin (0-β) By substituting the above θ, the bow side lateral movement speed v1T and the stern side lateral movement speed V4T can be calculated.

(Effect of the invention) As explained above, according to the present invention, the first and i2 G
By using a PS receiver and performing the above-described processing using a computing unit, it is possible to calculate and display the heading and speed at the same time without the need for a transmitter as in the past. Additionally, since it does not use the Earth's rotation or geomagnetism, accurate measurements can be made even in polar regions.

Moreover, since it has a simple configuration, it has the advantage of being able to realize an inexpensive, compact, and highly reliable device. Therefore ships, cars,
It is possible to easily measure the moving direction and speed of aircraft, etc., and is extremely effective, especially in polar regions.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a vector diagram showing the moving direction and speed of the ship. 1.4... 1st. Second antenna, 2,5...GPS
Receiver, 3... Arithmetic unit, 6... Display unit.

Claims (1)

[Claims] No. 1 installed near the bow and stern on the bow-stern line, respectively.
and a second GPS antenna, and first and second GPS antennas that measure the moving speed and moving direction of the first and second antennas from received signals of GPS satellites transmitted from the first and second GPS antennas. a GPS receiver, and the moving speed and moving direction of the first and second antennas sent from the first and second GPS receivers, the heading direction, and the moving speed in the bow direction;
A direction/speed measuring device comprising: a computing unit that calculates the lateral movement speed of the bow side and the lateral movement speed of the stern side; and a display device that displays these information.