JPH05155398A - North and south orbit controlling method using low thrust thruster - Google Patents

Abstract

PURPOSE:To minimize the reduction of control efficiency when there is a forbidden band by providing an orbital inclination angle for a node to keep it constant in an inertial space, and executing injections at the location nearest to the node outside the forbidden band, or providing an orbital inclination angle of 0 degree, and executing injections at the location which is expected to provide the best efficiency regardless of the node. CONSTITUTION:A node 11 is provided with a certain orbital inclination angle and is kept almost constant in an inertial space. Based on the positional relationship between a forbidden band 12 and the node 11, a thruster executes injections 10 on the node 11 when the forbidden band 12 is out of the node 11, while it executes injections 10 at the position nearest to the node 11 outside the forbidden band 12 when the band 12 is on the node 11. With the rotation of the node 11 caused by the injections taken into consideration, injections 10 start at one position outside the forbidden band and end at a proper position and then are executed at both front and rear of the band 12. In addition, an orbital inclination angle of 0 degree is provided and injections 10 are executed at the position which is expected to provide the best efficiency regardless of the node 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a north-south orbit controller capable of automatically executing a plurality of orbit control sets by a low thrust thruster, and north-south orbit control when there is a position on the orbit where thruster injection cannot be performed. It is about the method.

[0002]

2. Description of the Related Art FIG. 5 shows a block diagram of a conventional north-south orbit controller using a low thrust thruster. In this figure, 1 is the earth, 2 is an earth station, 3 is a geostationary orbit, 4 is a satellite body, 5 is an ion engine, and 6 is a command receiving device.

Next, the operation will be described. The orbit control result planned by the ground station 2 is transmitted to the satellite, the command receiving device 6 receives the result, and the ion engine 5 performs injection using the output signal of 6 as an input to perform north-south orbit control.

[0004]

Since the conventional north-south orbit control device is constructed as described above, the injection command must be transmitted immediately before the control is executed, and when there is a prohibited zone. Is controlled by avoiding this,
It is necessary to perform complicated and frequent control in order to suppress the decrease in control efficiency as much as possible when there is no forbidden zone, but this has a problem that it considerably burdens the operation on the ground.

The present invention has been made to solve the above problems, and there is a prohibited zone by storing a plurality of sets of control time and control amount planned on the ground in the control timer device. The purpose is to reduce the load on the ground to cope with complicated operations in the case of, and to provide a method for implementing north-south control by minimizing the decrease in control efficiency even when there is a forbidden zone. The purpose is that.

[0006]

In the north-south control method according to the present invention, the orbit inclination angle is given to a certain extent in the case of a forbidden zone, and the node is kept substantially constant with respect to the inertial space.
Due to the positional relationship between the forbidden band and the node, if the forbidden band does not cover the node, the thruster is ejected to the center of the node, and if the forbidden band overlaps the node, it is the position closest to the node outside the forbidden band and this influence Taking into consideration the rotation of the node, the injection is performed up to an appropriate position outside the forbidden zone at one point, and considering the rotation of the node, the injection is moved from the appropriate position to two points before and after the forbidden zone. The thrust thruster is used for north-south orbit control.

Further, as a control method when there is a forbidden zone, the orbit inclination angle is maintained at approximately 0 deg. By this, although the node cannot be determined, it is outside the forbidden zone regardless of the node, and the trajectory prediction and the control position up to the previous time, etc. In consideration of the above, the north-south orbital control is performed by the low thrust thruster that injects the thruster at the position where the efficiency is predicted to be the highest.

[0008]

In the present invention, as a north-south orbit control method (1), when there is a forbidden zone, the orbit inclination angle is given to a certain degree and the node is kept substantially constant with respect to the inertial space. , If the forbidden zone does not cover the node, thruster injection is performed at the center of the node, and if the forbidden zone overlaps the node, it is appropriate outside the forbidden zone, closest to the node, and considering the rotation of the node due to this effect. By injecting at one position outside the forbidden zone up to a certain position, and considering the rotation of the node, the injection is moved from an appropriate position to two points before and after the forbidden zone.
Even in the case of north-south orbital control with a forbidden zone using a low thrust thruster, the orbital control with the highest control efficiency is performed.

Further, as a control method (No. 2), the orbit inclination angle is held at 0 deg. With this, the node cannot be determined, but it is predicted to be the most efficient from the trajectory prediction and the injection position up to the previous time regardless of the node. Even if there is a forbidden zone, trajectory control is performed with the highest control efficiency by injecting the thruster at a certain position.

[0010]

【Example】

Example 1. FIG. 1 is an overall configuration diagram of an embodiment of a north-south orbit control device according to the present invention. In this embodiment, as is apparent from FIG. 1, the orbit control planning result planned for the earth 1 is transmitted from the ground station 2 to the satellite body 4 on the geostationary orbit 3, and this command received by the command receiving device 6 is received. The control timer device 7 stores the set of the injection time and the injection amount of the output signal from the receiving device 6 in the control timer device 7, and the low thrust thruster device 5 injects the signal from the control timer device 7. The orbit control is performed, and the actual thrust and injection time of the low thrust thruster device 5 are transmitted from the telemetry data transmitter 8 to the ground station 2.
It is configured to enable control evaluation of north-south orbit control. (A), (b) and (c) show the control method of the first embodiment which is an efficient control method when there is a forbidden zone in the configuration of the north-south orbit control device shown in FIG. In the figure, 1 is the earth, 13 is the North Pole, and 3 is a geostationary orbit. Since the forbidden zone 12 rotates 360 deg in the vernal equinox direction 9 in one year, the low thrust thruster injection position 1 is applied to the node 11 whose position is constant with respect to the inertial space.
0 moves other than the forbidden zone as shown in FIGS. 2 (a) (b) (c).

Next, the operation of the first embodiment will be described with reference to FIGS. FIG. 1 is a diagram for explaining the configuration of a north-south orbit control device, and FIGS. 2 (a), (b) and (c) are explanatory diagrams of a north-south orbit control method (part 1) when there is a forbidden zone using the device of FIG. FIG. 3 is a flow chart for explaining the north-south orbit control method (1). First, a north-south orbit control plan is implemented in the ground station 2 every orbit control planning period. This result is transmitted from the ground station 2 to the command receiving device 6 of the satellite body 4, and the output signal of the command receiving device 6 is sent to the control timer device 7 where it is stored as a set of injection time and injection amount. When the satellite body 4 reaches the planned low thrust thruster 5 injection position at the ground station 2, a signal is sent from the control timer device 7 to the low thrust thruster device 5, and the low thrust thruster device 5 is sent based on this signal. Will inject and control north-south orbit. Then, the thrust control and the injection time actually injected at this time are sent to the ground station 2 by the telemetry data transmission device 8 to perform the orbit control evaluation on the ground.

At this time, in the north-south orbit control when there is a forbidden band, the orbit inclination angle is given to some extent and the node is kept constant with respect to the inertial space, and according to the relationship between the forbidden band 12 and the node 11, as shown in FIG. As shown in FIG. 2B, when the forbidden band 12 does not cover the node 11, the injection 10 is performed. When the forbidden band 12 covers the node 11 as shown in FIG. In addition, the injection 10 is performed at a position closest to the node 11 and at an appropriate position in consideration of the rotation of the node due to this influence, at one position outside the forbidden zone, and the node rotation becomes large as shown in FIG. 2C. By controlling so that the injection 10 is performed at two positions, one outside and one outside the prohibited zone 12, the decrease in control efficiency due to the injection other than the node 11 can be minimized. It is carried out.

Embodiment 2. The first embodiment is a method in which the north-south orbit controller of FIG. 1 gives a certain orbit inclination angle and holds the node constant with respect to the inertial space so as to avoid the forbidden zone and perform injection. As a way
By keeping the orbit inclination angle at approximately 0 deg, and considering the injection position regardless of the node, the trajectory prediction and the injection position up to the previous time, etc., and by performing the low thrust thruster injection at the position that seems to be the most efficient, The decrease in control efficiency due to the injection other than the node 11 can be minimized.

[0014]

As described above, according to the present invention, means for storing a set of orbit control time and injection quantity in the satellite is provided, and a signal from the means is provided to give an instruction from the ground at an appropriate injection position. Since it is configured so that injection can be performed automatically regardless of the number of times of control such as north-south orbit control with a low thrust thruster and complicated operation methods such as when there is a forbidden zone, it can be easily implemented. it can. Also,
If there is a forbidden zone, the orbital inclination angle should be given to some extent and the node should be kept constant with respect to the inertial space, and the injection position should be changed depending on the relationship between the forbidden zone and the node, or the orbital inclination angle should be kept at 0 deg. Regardless of the trajectory prediction and the method of injecting at the position where the efficiency is predicted to be the highest from the previous injection position and the like, the control efficiency of the north-south orbit control when there is a forbidden zone can be minimized.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a north-south orbit control device using a low thrust thruster according to the present invention.

FIG. 2 is a diagram showing a north-south orbit control method (No. 1) by the low thrust thruster according to the first embodiment of the present invention;
Shows the injection position when the forbidden zone does not reach the node, (b) shows the injection position when the forbidden zone applies to the node, and (c) shows both sides of the forbidden zone in consideration of node rotation. The case of injection is shown.

FIG. 3 is a flowchart illustrating a north-south orbit control method (1) using a low thrust thruster when there is a forbidden zone according to the second embodiment of the present invention.

FIG. 4 is a flowchart illustrating a north-south orbit control method (No. 2) using a low thrust thruster when there is a forbidden zone according to the second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a north-south orbit control device using a conventional low thrust thruster.

[Explanation of symbols]

 1 Earth 2 Ground Station 3 Geostationary Orbit 4a Satellite Main Body 4b Solar Battery Paddle 5 Low Thrust Thruster Device 6 Command Receiver 7 Control Timer Device 8 Telemetry Data Transmitter 9 Spring Equine Point Direction 10 Low Thrust Thruster Injection Position 11 Node 12 Forbidden Zone 13 Arctic

Claims (2)

[Claims] 1. A receiving device for receiving the orbit control plan result transmitted from the ground, a control timer device for storing a set of thruster injection time and injection amount according to this orbit control plan, and this timer. In a geostationary satellite system equipped with a low-thrust thruster device that generates a thrust by inputting a signal from and a telemetry data transmitter that transmits the thrust and the time that the low-thrust thruster actually jets to the ground, in orbit If there is a position where thrusters cannot be ejected, that is, there is a forbidden zone, in order to minimize the decrease in control efficiency due to the inability to control with two nodes on the orbit, the orbit inclination angle should be set to a certain degree and the node should be almost constant with respect to the inertial space If the forbidden band does not reach the node, the If a thruster is ejected and the forbidden zone overlaps the node, the thruster is ejected at a position that is closest to the node outside the forbidden zone and takes into consideration the rotation of the node due to this effect, and to an appropriate position outside the forbidden zone. In addition, a north-south orbit control method using a low thrust thruster, in which injection is performed at two positions before and after the forbidden zone in consideration of the rotation of the node. 2. A receiving device for receiving the orbit control plan result transmitted from the ground, a control timer device for storing a set of thruster injection time and injection amount according to this orbit control plan, and this timer. In a geostationary satellite system equipped with a low-thrust thruster device that generates a thrust by inputting a signal from and a telemetry data transmitter that transmits the thrust and the time that the low-thrust thruster actually jets to the ground, in orbit When there is a position where the thruster cannot be ejected, that is, there is a forbidden zone, in order to minimize the decrease in control efficiency due to the inability to control with two nodes on the orbit, the inclination angle of the orbit is maintained at approximately 0 deg. It is not possible to do so, regardless of the node, it is outside the prohibited zone, and the efficiency is improved by considering the trajectory prediction and the injection position up to the previous time. A north-south orbit control method using a low thrust thruster that injects fuel at a position that is expected to be good.