JPS59185440A - Information transmission system of artificial satellite - Google Patents

Abstract

PURPOSE:To eliminate the need to take a countermeasure to radio wave interference and reduce the facilities of an earth station by transmitting telemetry information of a main and a stand-by equipment to the earth station as one wave of a down circuit. CONSTITUTION:The transmitting antenna 7 of the stand-by equipment 4 transmit the telemetry information of the stand-by equipment 4 to the main equipment 1, and the antenna 8 of the main equipment 1 receives it. The main equipment 1 superposes the telemetry information of the stand-by equipment 4 upon the telemetry information of the main equipment 1 and radiates them from the antenna 2 of the main equipment 1. Therefore, the earth station requires only one antenna 3 for down circuit reception, and also requires only one set of receiving facilities and demodulating and decoding facilities, so the ground facilities are reduced and the need to take a countermeasure to radio interference when a down circuit for two waves is used is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an information transmission system for artificial satellites that transmits telemetry information of two artificial satellites in geostationary orbit to an earth station. The purpose is to transmit to an earth station.

As shown in Figure 1, the IJ information transmission system consists of a lower 9-line transmission antenna attached to the main unit (11) and this main unit (1), as shown in Figure 1. (21, Earth station antenna for lower 9th edge reception from main unit (1) (31, Backup unit (4), Lower multi-line transmission antenna attached to this unit (4) (51 and spare unit) (
Consists of the earth station antenna (61) for receiving the lower 9 lines from the earth station antenna (31 and (6)). Originally, the spare machine (4) can be used as a substitute for the main machine (11) when the current machine (1) breaks down or during maintenance and inspection, so the necessity of the spare machine (4) is The operation of the standby machine (41) may be kept to the minimum necessary until the occurrence of the standby machine (41).
4) Teleme) It is necessary to constantly monitor IJ information on the ground and manage and operate the satellite. Therefore, normally even if it is a standby device, it must transmit on the lower 9 lines. The telemetry information of the main unit (11) is transmitted from the lower multi-line transmission antenna (2) attached to the main unit (1), and is received by the earth station antenna (31).The telemetry information of the standby unit (4) is Reserve 1
It is transmitted from the lower multi-line transmission antenna (5) attached to f41, and is received by the earth station antenna (61).

In this conventional method, nine antennas (1) for receiving telemetry information and a standby antenna (41 antennas for receiving telemetry information) are installed separately at the earth station, or one antenna is connected to the main unit in chronological order. (11 or the standby unit (41) is receiving telemetry information alternately, and the equipment at the earth station requires two systems for the main unit fi+ and the standby unit (4), and the main l11t + I+ as the lower 9 lines. Since it uses two waves: the lower 9 lines and the lower multiple lines of the standby unit (4), it has the disadvantage that it is necessary to take measures to avoid radio wave interference.

In this invention, the antenna for transmitting telemetry information directed toward the main unit attached to the standby unit transmits telemetry information from the standby unit to all main units, and the telemetry information directed to the standby unit installed in the two units is received. The antenna for this unit transmits the telemetry information of the standby unit to the telemetry information N' of the standby unit, and transmits the telemetry information of the standby unit received by this unit using an electronic device installed in the unit.
The above-mentioned drawbacks are eliminated by superimposing the IJ information and transmitting the IJ information to the entire earth station using the lower multiple lines of one wave transmitted by the two units. An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows the configuration of a telemetry information transmission system for a main unit and a standby unit according to the present invention. In Figure 2, fil is this machine, (21
is the antenna for downlink transmission attached to this unit, (31 is the earth station antenna for receiving the lower 9 lines from 11 of this unit, and
41 is a standby machine, (7j is an antenna for transmitting telemetry information of the standby machine (4) that is attached to the standby machine (4) and directed to the main machine (11), and (8) is installed in the main machine (11).

This is an antenna for receiving telemetry information of the standby unit directed towards the standby unit (4). The standby machine (41's antenna (71) receives radio waves including the telemetry information of the standby machine, which is radiated by the main unit's antenna (81 receives the telemetry information of the main unit), and the IJ information is superimposed with the standby machine's telemetry information @ fully superimposed. the antenna (
2) radiates from.

FIG. 3 is a diagram showing the configuration of the telemetry information transmission system of the present invention.

In Figure 3, (21 is the lower line transmission antenna attached to the main unit, (81 is the antenna for telemetry reception of the standby unit directed towards the standby unit, (9) is the telemetry receiver of the standby unit, and uni is the demodulator. (αp is the telemetry encoder of this machine) IJ sensor = p, tt21 is the telemetry encoder of this machine, a
31 is an electronic device having a telemetry information superimposition function, and 31 is a telemetry transmitter. The antenna f8i receives radio waves containing telemetry information emitted by the standby unit (41).

The signal is inputted to an electronic device 03) having a telemetry information superimposition function via a telemetry receiver (9) and a demodulator QU+.

On the other hand, the telemetry information of the machine sensed by the telemetry encoder circle of the machine is encoded by the telemetry encoder Q2+ and then input to the electronic device [31]. The encoded telemetry information of the main unit II and the standby unit +41 superimposed by the electronic device α31 is modulated and enhanced by the transmitter (1 to 1), and is radiated to the space via the antenna (21).

As described above, according to the present invention, in order to transmit IJ information (from one main unit and a standby unit) to the earth station using the lower Ml l wave, the antenna (3) for receiving the lower nine lines of the earth station is one At the same time, the receiving equipment and demodulation/decoding equipment of the earth station can be reduced to just one aircraft, making a significant contribution to reducing the need for ground equipment.
There is no need to take measures to avoid radio wave interference by using 9 lines under the waves, and it is extremely effective as an information transmission method for backup satellites.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional telemetry information transmission system for the main unit and backup unit of an artificial satellite in orbit. FIG. 2 is a block diagram of a telemetry information transmission system for the main unit and a standby unit according to the present invention, and FIG. 3 is a block diagram of a telemetry information transmission system for the main unit according to the present invention. In the figure (11 is the main unit # (2) is the lower 9 line transmitting antenna, (31 is the earth station antenna, (4) is the standby unit, (5) is the lower 9 line transmitting antenna, (6) is the lower line transmitting antenna. Antenna for line reception, (7) is antenna for transmitting telemetry data, (8j is antenna for receiving telemetry data, (91 is telemetry receiver, shout is demodulator, 01) is a group of telemetry sensors, α power is telemetry encoder, u3 041 is an electronic device having a telemetry data superimposition function, and 041 is a telemetry transmitter. In addition, the same or corresponding parts in FIG. 9 are indicated with the same reference numerals.

Claims (1)

[Claims] In the satellite information transmission method, two geostationary satellites are placed in orbit as the main unit and a backup unit at a predetermined nadir point longitude, and the telemetry information of the main unit and the backup unit is transmitted to the earth station. The information is transmitted to the main unit via radio waves in outer space using the directional antenna equipped on the standby unit and the main unit, and the information is transmitted to the main unit via the electronic device installed on the standby unit and received by the main unit. An information transmission method for artificial satellites characterized by superimposing telemetry information on the telemetry information of this unit and transmitting it to the earth station in one downlink wave of this unit.