JPH0222634B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna rotation control device that controls the number of rotations per unit time of a rotating body such as a radar antenna under time management.

Conventionally, there has been a device of this type having the configuration shown in FIG. In the figure, 1 is an antenna, 2 is a drive motor, 3 is an amplifier, 4 is a variable resistor for speed adjustment, 5 is a speed loop for keeping the speed constant, and 6 is an antenna angle position detector.

Next, the operation will be explained. In this device, the number of revolutions per unit time of the antenna 1 is determined by the input power of the drive motor 2 versus the number of revolutions, the degree of amplification of the amplifier 3, and the voltage value given by the variable resistor 4 for speed adjustment. Moreover, the rotational speed of the antenna 1 is controlled by a speed loop 5 consisting of an amplifier 3 that amplifies the difference between the voltage value given by a variable resistor 4 and the rotational speed of the drive motor 2, and a drive motor 2 that rotates the antenna 1 according to the output of the amplifier 3. is always kept constant. Further, the angular position of the antenna 1 is detected by an antenna angular position detector 6, and is used for various data processing.

In conventional devices of this type, the number of rotations per unit time of the antenna was determined by the rotational speed of the antenna and was completely unrelated to the time of day. Furthermore, even if the rotation starts in synchronization with the time, it is difficult to maintain a constant number of rotations per unit time over a long period of time, and due to fluctuations in ambient temperature, generation of wind, changes in load, etc. However, the drawback was that the rotational speed would change.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and in a device such as a radar in which the number of rotations of the antenna required for one data collection is N times, a time signal is inputted from a clock device, and the time signal is inputted from a clock device. It is an object of the present invention to provide an antenna rotation control device which maintains the number of rotations per unit time of the antenna constant over a long period of time while checking a time signal with an ideal angular position of the antenna.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, 1 is an antenna whose number of revolutions required for one data collection is N times, 2 is data, 3 is an amplifier, 4 is a variable resistor for speed adjustment, 5 is a speed loop, 6 is an antenna angle position detector, 8 is a variable voltage generator for adjusting the rotation speed, 9 is a time check circuit, 10 is a clock device, and 7 is a voltage input for speed adjustment to the amplifier 3 at the N-1 rotation of the antenna rotation speed. This is a rotation control changeover switch that switches from the output to the output of the variable voltage generator 8.

Next, the operation will be explained. In this method, the antenna speed is determined by the same principle as in the conventional method.

A time signal is input from the clock device 10 to the time matching circuit 9. In this time checking circuit 9, when the rotation of the antenna 1 enters the N-1st rotation, the actual angular position of the antenna 1 is checked against the time, and as a result of this checking, when the number of rotations per unit time is constant, Outputs the difference between the ideal angular position that should originally be indicated and the actual angular position. The variable voltage generator 8 selects and outputs a voltage that determines the speed prepared in advance according to this difference, and at the same time, the rotation control changeover switch 7
The speed adjustment voltage input to the motor is switched from the output of the speed adjustment variable resistor 4, which provides a constant speed, to the output of the variable voltage generator 8. That is, the output of the variable voltage generator 8 is input to the amplifier 3 at the same time when the rotation of the antenna 1 enters the Nth rotation of N rotations. Since the variable voltage generator 8 selectively outputs the voltage for adjusting the speed as described above, the antenna 1 follows this and rotates at an appropriate speed. As mentioned above, this prepared voltage is generated corresponding to the difference between the actual angle and the ideal angle of the antenna 1, so that when the antenna 1 enters the first of the next N rotations, the ideal time is reached. Selected. Then, the rotation control changeover switch 7 is set to the next N.
When entering the first rotation, the speed adjustment voltage input to the amplifier 3 is switched from the output of the variable voltage generator 8 to the output of the speed adjustment variable resistor 4. By repeating this operation, the antenna 1 rotates in units of N rotations required to collect one data, matching the time, and as a result, accurate data can be collected every N rotations.

In the above embodiment, it is possible to further simplify the system by using a microprocessor for the rotation control changeover switch 7 or the time verification circuit 9 in FIG. Further, in the above embodiment, a case has been described in which the radar antenna is controlled, but the same effect can be obtained even if the present invention is used in a device that controls the number of rotations per unit time using a general rotating body.

As described above, according to the present invention, the number of revolutions per unit time of the antenna can be kept constant for a long period of time, and this can be maintained relatively without significantly changing the antenna drive system of a conventional radar device. It can be easily achieved. Furthermore, the temporal reliability of data obtained in fixed time units can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional antenna rotation control device, and FIG. 2 is a block diagram of an antenna rotation control device according to an embodiment of the present invention. 1...Antenna, 2...Drive motor, 3...Amplifier, 4
...Variable resistor for speed adjustment, 5...Speed loop, 6...Antenna angle position detector, 7...Rotation control changeover switch, 8...Variable voltage generator, 9...Time check circuit, 10...Clock device. In the figures, the same number indicates the same or equivalent part.

Claims (1)

[Claims] 1. An antenna rotation control device for controlling the rotation of an antenna whose number of rotations required for one data collection is N times, which amplifies the difference between the speed adjustment voltage and the actual rotation speed of the antenna. a speed loop consisting of an amplifier and a drive motor that drives the antenna according to the output of the amplifier; a clock device that generates a time signal; an antenna angular position detector that detects the actual angular position of the antenna; a time verification circuit that compares the angular position of the antenna with the time at the N-1st rotation of the N rotations of the antenna and outputs the difference between the ideal angular position and the actual angular position of the antenna; and an output of the time verification circuit. a variable voltage generator that generates a speed adjustment voltage such that the actual angular position of the antenna reaches the ideal angular position at the end of N rotations, and a speed adjustment voltage input to the above amplifier after N rotations. An antenna rotation control device comprising: a rotation control changeover switch for switching from a constant voltage to a speed adjustment voltage according to the output of the time checking circuit output from the variable voltage generator at the Nth rotation.