JPH02206780A - Antenna driving device - Google Patents

Abstract

PURPOSE:To surely prevent the resonance to a structure by providing a pulse number generating part for generating a pulse number signal corresponding to directional control information, and a driving signal generating part for generating a driving signal having a pulse distribution of a random number. CONSTITUTION:To a pulse number generating part 10, directional error information from a directional error detection sensor is inputted. As a result, this pulse number generating part 10 generates a pulse number signal of (n) for determining the quantity driven in a control period corresponding to its directional control information and outputs it to a driving signal generating part 11. In this driving signal generating part 11, a random number generating part 11a is provided, and a driving signal obtained by converting the pulse number signal inputted by this random number generating part 11a to a pulse distribution of a random number distribution is generated, and outputted to an antenna driving part 12. This antenna driving part 12 drives a stepping motor which is not shown in the figure in accordance with the driving signal and brings an antenna to directional control. In this case, since a frequency which follows up driving of the stepping motor of the antenna driving part 12 cannot be specified, excitation energy becomes low and an excitation of various structures can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an antenna drive device used for directivity control of an antenna mounted on a space vehicle such as an artificial satellite.

(Prior Art) Conventionally, this type of antenna driving device uses a stepping motor as a driving source in order to achieve highly accurate pointing control in response to pointing error information, and this stepping motor is controlled according to the driving rate. The direction of the antenna is controlled by controlling the drive signal with a drive signal of equal pulses n during the control period. That is, as shown in FIG. 2, when pointing error information is input to the pulse number generator 1, the pulse number generator 1 generates a pulse number representing the number of torque pulses within the control period according to the drive rate, for example. A signal is generated, and a drive signal generating section 2 at a subsequent stage generates a drive signal at regular intervals according to the pulse number signal, and this drive signal drives a stepping motor (not shown) of the antenna drive section 3. Directional control of the antenna.

However, in the above-mentioned antenna drive device, since the pulse intervals of the drive signal are equally spaced, it has the property of exciting a frequency of nHz corresponding to the pulse n of the pulse number signal. The problem is that the space structure resonates with the natural frequency of the space structure.

According to this, the nHz excitation frequency varies depending on the drive rate of the stepping motor (not shown), and the natural vibration frequency of all structures is not constant, so the frequency varies depending on the drive rate. This is a particularly big problem because it resonates with the structure.

(Problems to be Solved by the Invention) As described above, in the conventional antenna drive device, by having different excitation frequencies depending on the drive rate, it is possible to match the natural vibration frequency of different structures depending on the drive rate. Since there is a risk of resonance with each other, there has been a problem that manufacturing including design is troublesome, and handling is extremely complicated.

The present invention has been made in view of the above circumstances, and provides an antenna drive device that can reliably prevent resonance with structures and can simplify handling as much as possible. The purpose is to.

[Structure of the Invention] (Means for Solving the Problems) The antenna driving device of the present invention includes a pulse number generation section that generates a pulse number signal corresponding to pointing error information, and a pulse number signal of the pulse number generation section. a drive signal generation section that generates a drive signal having a corresponding random number pulse distribution; and an antenna drive section that controls drive of the stepping motor and directivity of the antenna in response to the drive signal of the drive signal generation section. It was constructed with the following.

(Function) According to the above configuration, the drive signal generated by the drive signal generation section has a pulse distribution of random numbers and does not have a specific excitation frequency, so that all frequencies are excited with low energy. . Therefore, excitation of the structure is eliminated, and resonance with the structure can be reliably prevented.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an antenna driving device according to an embodiment of the present invention, in which pointing error information from a pointing error detection sensor (not shown) is input to a pulse number generating section 10. Then, this pulse number generation section 10 generates n pulse number signals that determine the amount of driving in the control period according to the command control information, and outputs them to the drive signal generation section 11. This drive signal generation section 11 is provided with a random number generation section 11a, which converts the input pulse number signal into a pulse distribution of random number distribution to generate a drive signal, and outputs it to the antenna drive section 12. do. The antenna drive unit 12 drives a stepping motor (not shown) in response to a drive signal to control the direction of the antenna.

In this way, the antenna driving device has the pulse number generator 1
In response to the pulse number signal starting from 0, the drive signal generating section 11 generates a drive signal having a pulse distribution of random numbers and having no specific excitation frequency, and using this drive signal, the antenna drive section 1
2, the frequency associated with driving the stepping motor (not shown) of the antenna drive unit 12 does not have a specific frequency, so the excitation energy is low for all frequencies. Therefore, it is possible to prevent various structures from being excited due to the drive. According to this, resonance with structures with various natural frequencies is prevented regardless of the antenna drive rate.
Highly accurate pointing control can be realized, and the degree of freedom in design is improved, so handling and manufacturing can be made as simple as possible.

Note that this invention is not limited to the above-mentioned embodiments, but also includes other embodiments.
It goes without saying that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, the present invention provides an antenna that can reliably prevent resonance with structures and can simplify handling as much as possible. A driving device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an antenna driving device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional antenna driving device. 0...Pulse number generation unit 1...Drive signal generation unit,...Random number generation unit, 2...Antenna drive unit.

Claims (1)

[Claims] a pulse number generation section that generates a pulse number signal corresponding to pointing control information; a drive signal generation section that generates a drive signal having a random number pulse distribution in response to the pulse number signal of the pulse number generation section; An antenna drive device comprising: an antenna drive unit that controls driving of a stepping motor in response to a drive signal from a drive signal generation unit and controls directionality of an antenna.