JPH06174488A - Spin measuring circuit - Google Patents

Abstract

PURPOSE:To provide a small spin measuring circuit capable of accurately measuring the spin (revolving speed) of a revolving structure such as an antenna or an air frame at a low cost. CONSTITUTION:A self-azimuth detecting circuit 2 detecting geomagnetism and outputting the azimuth data is provided on the rotary shaft of a structure, and the azimuth data from the self-azimuth detecting circuit 2 are stored in a memory circuit 5 in sequence. The azimuth data stored in the memory circuit 5 are read out in sequence, and the spin (revolving speed) of the structure is calculated from the change on the time axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure spin (rotational speed) measurement.

[0002]

2. Description of the Related Art FIG. 8 is a diagram of a rotating structure. In the figure, 1 indicates that the structure is rotating at an angular velocity W. FIG. 9 is a block diagram showing a conventional spin (rotation speed) measuring circuit for measuring the rotation speed of the structure 1. In FIG. 9, 13 is composed of a gyroscope 14 and a drive unit 15 for rotating the gyroscope 14. Is an angular velocity detection unit. 5 is a memory circuit for storing the angular velocity W,
The storage circuit 5 is composed of an analog-digital converter 6 and a semiconductor memory 7. Further, FIG. 10 is a view showing the appearance of the gyroscope 14, and 16 in the figure is an angular velocity sensor.

Next, the operation will be described. Angular velocity detector
A gyroscope 14 is rotated by a driving unit 15 of 13.
When the structure 1 rotates at the angular velocity W, a force F is generated in the angular velocity sensor 16 of the gyroscope 14 provided inside according to the angular velocity W. The angular velocity sensor 16 generates an electric signal (angular acceleration signal) in proportion to the force F.

Next, the angular velocity signals from the angular velocity detection unit 13 are sequentially stored in the semiconductor memory 7 through the analog-digital converter 6 of the storage circuit 5. Next, after the rotation of the structure is completed, the data in the internal semiconductor memory 7 is sequentially read to obtain the data of the change in the angular velocity W of the structure over time. The data is integrated over time, and the spin (rotation speed) of the structure 1 is measured.

[0005]

Since the conventional spin (rotational speed) measuring circuit is constructed as described above, an error may occur in angular velocity detection due to vibration and impact due to the structure of the gyroscope. . For this reason, an error also occurs in the rotational speed obtained by integrating the angular velocity data stored in the semiconductor memory, and the error accumulates, especially when measuring for a long time, and the measured rotational speed deviates considerably from the true value. .

Further, due to the structure of the gyroscope and the structure of the drive section for rotating the gyroscope, there is a problem that the angular velocity detection section becomes large and the cost is high.

The present invention has been made in order to solve the above-mentioned problems. By directly detecting the rotational speed of the rotation of a structure, the measurement error of the rotational speed can be reduced and the spin can be miniaturized. The purpose is to provide a measuring circuit.

[0008]

A spin measuring circuit according to the present invention uses a self-orientation detecting circuit for detecting geomagnetism in a rotational speed detecting portion of a structure and sequentially stores the orientation data in a semiconductor memory. Is.

[0009]

The self-orientation detecting circuit according to the present invention detects the geomagnetism, detects the position of the self-orientation with respect to magnetic north, and measures the rotation angle of the structure by the angle of change of the self-orientation. , The number of rotations is measured.

[0010]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a rotating structure, 2 is a self-orientation detecting circuit mounted on the rotation axis inside the structure 1, and 3 is a magnetic field line of geomagnetism detected by the self-orienting detecting circuit 2. . FIG. 2 is a view from the top of the structure. In the figure, reference numeral 4 is a reference point of the self-direction detecting circuit 2, and θ is an azimuth angle of the reference point 4 of the self-direction detecting circuit 2 with respect to magnetic north of the geomagnetism 3. FIG. 3 is a block diagram showing a spin measurement circuit. Reference numeral 5 is a memory circuit for storing the self-direction detection data of the self-direction detection circuit 2. The storage circuit 5 is composed of an analog-digital converter 6 and a semiconductor memory 7. There is.

Next, the operation will be described. The self azimuth detecting circuit 2 detects the azimuth angle θ from magnetic north by the geomagnetism 3 detected by the reference point 4 of itself. When the structure 1 rotates, the azimuth data of the detected azimuth angle θ of the self azimuth detection circuit 2 mounted in the structure 1 changes and is output. This azimuth data is analog-digital converter 6
Is converted into a digital signal through and is sequentially stored in the semiconductor memory 7.

Then, after the rotation of the structure 1 is completed, the data in the internal semiconductor memory 7 is read out, and the spin (rotation speed) is measured from the change in the angle of the structure with respect to magnetic north and its change on the time axis. In this way, the rotation angle of the structure can be detected and stored as a signal of the angle from the self-orientation detecting circuit 2, and the rotation speed can be measured, so that accurate measurement can be performed.

Example 2. In the above embodiment, the horizontal planes of the structure 1 and the azimuth detecting circuit 2 are the magnetic field lines 3 of the geomagnetism.
On the other hand, when it is tilted, the detected angle error from magnetic north becomes large, but it is possible to confirm the passage of the reference point 4 in the magnetic north direction from the change in the bearing data. Therefore, it is possible to know the rotation speed of the structure 1. For example, as shown in FIG. 4, by mounting the spin measurement circuit of the present invention on a flying body 8 such as a rocket, the spin (rotation speed) during flight can be determined. It is possible to measure.

Example 3. Further, in the above-described embodiment, the case where the rotation speed is measured by storing the self-orientation detection data in the semiconductor memory 7 has been described. However, even if the structure rotates as shown in FIG. 5, as shown in the block diagram of FIG. Based on the self-orientation detection data, the motor 10
Antenna control circuit for directing the antenna 9 in the freely rotating structure 1 to one position by rotating the antenna in the opposite direction.
Can be applied to 11.

Example 4. Further, as an application of the above-mentioned other embodiment, as shown in FIG. 7, a remote control receiver 12 is attached, and by pointing the directional direction of the antenna by remote control, an antenna in a structure freely rotating in space can be arbitrarily set. It can be applied to an antenna pointing control circuit capable of always pointing in the direction of.

[0016]

As described above, according to the present invention, the self-orientation detecting circuit capable of detecting the geomagnetism and knowing its own orientation with respect to magnetic north is used for the rotation measurement of the structure. The spin (rotation) can be accurately measured, the size can be reduced as compared with the conventional gyro system, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an external view of a structure according to an embodiment of the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is a block diagram of a spin measurement circuit according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of an example of spin measurement of a flying object showing another embodiment of the present invention.

FIG. 5 is an external configuration diagram of an antenna pointing control device showing another embodiment of the present invention.

6 is a block diagram of the antenna pointing control circuit of FIG.

FIG. 7 is a block diagram of an antenna pointing control circuit showing another embodiment of the present invention.

FIG. 8 is an external configuration diagram of a conventional structure.

FIG. 9 is a block diagram of a conventional spin measurement circuit.

FIG. 10 is a perspective view for explaining the gyroscope of FIG.

[Explanation of symbols]

 1 structure 2 self-orientation detection circuit 5 memory circuit 6 analog-digital converter 7 semiconductor memory

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masao Nakashige, 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Communication Equipment Works (72) Inventor Toshihiko Mori 8-1-1 Tsukaguchihonmachi, Amagasaki (72) Inventor Hiroo Naito 8-1-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Electric Corporation Communication Machine Works

Claims (1)

[Claims] 1. A spin measurement circuit for measuring the number of rotations of a rotating structure, which is provided on the rotation axis of the structure and which detects the azimuth of the structure by detecting geomagnetism. And a memory circuit for sequentially storing the direction data output from the self-direction detecting circuit in the memory, and the direction data stored in the memory circuit are sequentially read out, and the rotational speed of the structure is calculated from the change on the time axis. A spin measuring circuit comprising a calculating means for calculating.