JP2941391B2 - Antenna drive - Google Patents

Description

Description: Object of the Invention (Industrial application field) The present invention relates to an antenna driving device used for controlling the pointing of a mounted antenna of a spacecraft including an artificial satellite in a target direction. .

(Prior Art) Generally, as shown in FIG. 2, in this type of antenna driving device, a control unit 1 controls a first direction with respect to a target direction based on an antenna pointing error detected by a tracking error detection unit 2 such as an RF sensor. And the antenna angle of the on-board antenna 4 detected by the angle detection unit 3 matches the tracking target direction angle calculated by the target angle calculation unit 6 based on the orbital element from the trajectory calculation unit 5. 2 is generated. The control unit 1 is the first
In the tracking mode, the drive mechanism 7 is driven and controlled by the first drive signal to reduce the antenna pointing error of the mounted antenna 4 to “0”.
In the second tracking mode, the driving mechanism 7 is driven and controlled by the second drive signal so that the antenna angle of the on-board antenna 4 coincides with the tracking target direction angle. These first
And the second tracking mode is usually the second tracking mode,
First, after roughly pointing in the target direction, the target direction is constantly tracked in the first tracking mode.

However, in the above antenna driving device, in the first tracking mode in which the antenna pointing error is set to “0” due to the performance of the tracking error detection unit 2, the target passes, for example, near the zenith of a spacecraft (not shown). When entering the target tracking impossible area such as a case, there is a problem that the error detection of the tracking error detection unit 2 becomes difficult, and the target tracking becomes impossible. This problem arises due to the relationship between the responsiveness of the drive speed of the drive mechanism 7, the rotation limit, and the like, and becomes a serious problem because it is difficult to quickly recover from tracking when the target tracking impossible region is left.

Therefore, as a means for avoiding the above-described problem, it is conceivable to quickly perform the tracking recovery operation using, for example, a command from the ground.

However, the above-described means has a problem that the burden of operation on the ground increases.

(Problems to be Solved by the Invention) As described above, the conventional antenna driving device has a problem that it is difficult to quickly recover from tracking after passing through the target tracking impossible area.

The present invention has been made in view of the above circumstances, and has as its object to provide an antenna driving device which has a simple configuration and can realize a quick tracking recovery operation after passing through a target tracking impossible area. .

[Configuration of the Invention] (Means for Solving the Problems) The present invention generates a first antenna drive signal based on a pointing error between a tracking target and an on-board antenna, and generates a first antenna drive signal based on an antenna angle and an orbital element of a spacecraft. An antenna control means for generating a second antenna drive signal; and a first tracking mode for setting an antenna pointing error of said mounted antenna to "0" in response to the first antenna drive signal generated by said antenna control means. Antenna driving means driven in a second tracking mode in which the antenna angle of the mounted antenna is made to coincide with a tracking target direction in response to a second antenna driving signal, and a first tracking of the antenna driving means In the mode, the presence / absence of an untrackable area avoidance operation of the on-board antenna is determined based on the orbital element. The antenna angle of the on-board antenna is set to an initial setting position, and control is performed in the second tracking mode so that the antenna angle of the on-board antenna coincides with the tracking target direction. An antenna driving device comprising: an untrackable area avoidance operation means for transmitting a non-trackable area avoidance signal for performing the tracking operation of the on-board antenna in the mode to the antenna control means to switch and control a tracking method. It is.

(Operation) According to the above configuration, in the first tracking mode, in the first tracking mode, the tracking from the non-trackable area avoiding operation means is performed in a state where the non-trackable area avoiding operation means detects the non-trackable area. After the impossible area avoidance signal is input, the antenna angle of the on-board antenna is set to the initial setting position, and then the antenna driving means is driven in the second tracking mode so that the antenna angle of the on-board antenna coincides with the tracking target direction. Is switched to the first tracking mode again in the matched state, and the pointing is controlled to the target. Therefore, after passing through the non-trackable area, a quick tracking recovery operation in the first tracking mode is realized without being affected by performance such as the response of the driving speed of the antenna driving means and the rotation limit.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an antenna driving apparatus according to an embodiment of the present invention. A control unit 10 includes a target angle calculation unit 12 for obtaining a tracking target direction angle signal based on the orbital element calculated by the orbital calculation unit 11. The output terminal of the tracking error detection unit 14 that detects the antenna pointing error of the on-board antenna 13 and outputs an antenna pointing error signal and the output terminal of the angle detection unit 15 that detects the antenna angle of the on-board antenna 13 are connected. Is done. The control unit 10 generates a first drive signal constituting a first tracking mode for tracking the antenna pointing error of the on-board antenna 13 to “0” based on the antenna pointing error signal from the tracking error detecting unit 14. And a second tracking mode for tracking the antenna angle based on the tracking target direction over-accuracy signal from the target angle calculation unit 12 and the antenna angle signal from the angle detection unit 15 so as to match the tracking target direction angle. A second drive signal to be configured is generated, and the first and second drive signals are output to the drive mechanism 16 from an output terminal. The driving mechanism 16 controls the pointing of the mounted antenna 13 in the target direction according to the input first and second driving signals.

Further, an output terminal of the non-trackable area avoiding operation unit 17 is connected to the control unit 10, and a trajectory calculating unit 11 is connected to an input terminal of the non-trackable area avoiding operation unit 17. In the first tracking mode, the non-trackable area avoiding operation unit 17 determines whether or not there is a non-trackable area avoiding operation based on the input trajectory element and the antenna pointing error. A possible area avoidance signal is output to the control unit 10. In response to the non-trackable area avoidance signal, the control unit 10 sets the antenna angle of the on-board antenna 13 to the initial setting position, is switched from the first tracking mode to the second tracking mode, and receives the second drive signal. And outputs the second drive signal to the drive mechanism 17. When the antenna angle matches the tracking target direction angle, the mode is switched again to the first tracking mode to generate the first drive signal. And outputs it to the drive mechanism 17.

In the above configuration, the control unit 10 generates a first drive signal such that the pointing error becomes “0” in response to the pointing error signal from the tracking error detecting unit 14 in the steady first tracking mode. To the drive mechanism 17. The drive mechanism 17 performs tracking for controlling the directivity of the on-board antenna 13 in accordance with the input first drive signal. In such a steady first tracking mode, the non-trackable area avoiding operation unit determines whether or not the on-trackable area avoiding operation of the on-board antenna 13 is performed based on the input trajectory element, and determines whether the target is in the untrackable area. In a state where it is determined to enter, a tracking impossible area avoidance signal is output to the control unit 10. Then, the control unit 10 controls the antenna angle of the on-board antenna 13 to the initial setting position. Then, upon detecting that the target has entered the non-trackable area, the non-trackable area avoidance operation unit 17 switches to the second tracking mode in which the antenna angle of the on-board antenna 13 matches the tracking target direction. In the second tracking mode, when the antenna angles of the on-board antenna 13 are followed and matched, the tracking impossible area avoiding operation unit 17 switches the control unit 10 back to the first tracking mode, and the on-board antenna Tracking is performed with the pointing error of 13 as “0”.

As described above, the antenna driving device detects the non-trackable area based on the trajectory element and the pointing error signal, and generates the non-trackable area avoidance signal.
After the antenna angle of the on-board antenna 13 is set to the initial setting position based on the non-trackable area avoidance signal from the non-trackable area avoidance operation unit 17, the control unit 10 is switched from the first tracking mode to the first tracking mode. The second tracking mode is switched to control the antenna angle to match the tracking target direction, and in the matched state, the control unit 10 is switched again to return to the original first tracking mode. According to this, in the first tracking mode, the tracking recovery operation after the on-board antenna 13 has passed through the non-trackable region can be quickly performed irrespective of the performance such as the rotation limit and the driving speed of the driving mechanism 16.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[Effects of the Invention] As described in detail above, according to the present invention, there is provided an antenna driving apparatus which can realize a quick tracking recovery operation after passing through a target non-trackable area with a simple configuration. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an antenna driving device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional antenna driving device. 10 ... Control unit, 11 ... Orbit calculation unit, 12 ... Target angle calculation unit, 13 ... Onboard antenna, 14 ... Tracking error detection unit, 15 ...
… Angle detection unit, 16… Drive mechanism, 17… Tracking impossible area avoidance operation unit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01S 3/00-3/74 H04B 7/185

Claims (1)

(57) [Claims] An antenna control for generating a first antenna drive signal based on a pointing error between a tracking target and an on-board antenna, and generating a second antenna drive signal based on an antenna angle and an orbital element of a spacecraft. Means for driving the on-board antenna in a first tracking mode in which the antenna pointing error is "0" in response to a first antenna drive signal generated by the antenna control means, and in response to a second antenna drive signal. Antenna driving means driven in a second tracking mode to make the antenna angle of the mounted antenna coincide with a tracking target direction; and in the first tracking mode of the antenna driving means, the mounted antenna based on the orbital element. The presence or absence of the non-trackable area avoidance operation is determined, and in a state where the target is determined to be in the non-trackable area, the antenna angle of the mounted antenna is set to the initial setting position. In the second tracking mode, control is performed so that the antenna angle of the on-board antenna matches the tracking target direction.
A tracking impossible area avoiding operation means for sending a tracking impossible area avoidance signal for performing the tracking operation of the on-board antenna in the tracking mode to the antenna control means and switching and controlling a tracking method. Antenna drive.