JPS6062739A - Satellite mounting device - Google Patents

Abstract

PURPOSE:To simlify the satellite mounting device by applying band split to a reception signal and allowing a transmission destination to exchange each split signal in an SCPC satellite communication system where exchange is performed at a satellite station. CONSTITUTION:After each reception SCPC multiplex high frequency signal of a reception multi-beam is given to reception input terminal 1(1-1-1-N) and the signal is amplified and frequency-converted at a reception section 2(2-1-2-N), the result is subjected to band split at a variable band pass filter 11 (11-1-11-N- N). Then the said band split signal is exchanged at each transmission beam to be connected. That is, the band split signal is frequency-converted at variable frequency converts 12(12-1-1-12-N-N), synthesized by synthesizers 13(13-1-13-N) at each band split signal having the same transmission beam to form a transmission SCPC multip signal. The multiplex signal from each syntheiszer 13 is applied to transmission sections 9(9-1-9-N) and fed to a multi-beam antenna from transmission output terminals 10(10-1-10-N). In changing the connection channel number between the multi-beams of transmission and reception because of fluctuation of traffic, a controller 14 changes the band of a filter 11 and a converting frequency band of a frequency converter 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a switching device mounted on a communication satellite.

(Background Art) An example of a conventional device of this kind is shown in FIG. In the figure, ■ is an input terminal, 2 is a receiver, 3 is a channel divider, 4 is a demodulator, 5
6 is a switch, 6 is a switching controller, 7 is a modulator, 8 is a channel combiner, 9 is a transmitter, and 10 is a transmitter output terminal. The numbers 1 to N of the components 1, 2, and 3 in the figure are the numbers of the connected receiving beams. 4 first addition number 1~
N is the number of the connected receive beam, and the second appended numbers 1 to M are the numbers of the 5 cpc channels in each receive beam. The first prefix number 7 is the number of the transmit beam to be connected, and the second prefix number is the number of the 5 cpc channel in each transmit beam. The numbers 8, 9 and 10 are the transmission beam numbers to be connected.

Each received 5 cpc multiplex high frequency signal of the received multi-beam is
It is connected to the input terminal of the receiving section of , and is amplified and frequency-converted in the receiving section of 2 to produce an intermediate frequency band signal, which is divided into 5 CPC channels by the channel divider of 3 and demodulated by the demodulator of 4. -Spant signal shall be used. This baseband signal is exchanged in the exchanger 5 according to the instructions of the exchange controller 6, a modulator 7 and a channel combiner 8 generate a 5cpc signal for transmission in the IF band, and a transmitter 9 converts it into a high-frequency signal. Frequency conversion and amplification 10
The output terminal of the transmitting section is connected to the transmitting multi-beam antenna. In this device example, if the number N of multi-beams is 10, and the number M of channels multiplexed with 5 CPC in each multi-beam is 5,000, then the required number of demodulators of 4 and modulators of 7 is NXM -50,000, which is 5. However, a 50,000 x 50,000 exchanger had the disadvantage that the equipment on board the satellite would be large.

(Problem to be solved by the invention) In order to eliminate these drawbacks, the present invention is characterized in that a received signal is band-divided and each band-divided signal is exchanged with a destination, and its purpose is to simplify a satellite-mounted device.

(Structure and operation of the invention) FIG. 2 shows an embodiment of the present invention, in which the receiving section 1 (3) input terminal, the receiving section 2, the transmitting section 9, and the transmitting section output terminal 10 are also numbered. Including, it is the same as Figure 1.

11 is a variable band pass filter, 12 is a variable frequency converter, 13 is a synthesizer, and 14 is a controller. 11 and 1
The first prefix number of 2 is the number of the connected receiving beam, and the second prefix number is the number of the connected transmitting beam. The number 13 is the number of the connected transmission beam.

Each received 5 cpc multiplex high frequency signal (for example, 6 GHz band, 30
A 5,000 KHz channel spacing (multiplexed wave with 5,000 KHz channels) is connected to the input terminal of the receiver section 1, and the receiver section 2 amplifies and converts the frequency (for example, to 400 A/IH2 band), and then converts the band using variable bandpass filters 11. This band-divided signal (in this example, the 5c included in the band-divided signal
(The average number of PC channels is 500) are exchanged for each connected transmission beam. A variable frequency converter 12 converts the frequency of this band-divided signal (for example, to 800 MH2 band), and a combiner 13 synthesizes band-divided signals that share the same transmission beam.

(4) A 5 cpc multiplexed signal for transmission is obtained. Note that the frequency bands of the respective band-divided signals synthesized by the 13 synthesizers are frequency-converted by 12 variable frequency converters so as not to overlap. The 5 cpc multiplexed signal for transmission is frequency converted (
For example, 4 GHz band) and amplify the multi-beam antenna from 10 transmitter output terminals to transmit multi-beams. When changing the configuration of the number of connected channels between transmitting and receiving multi-beams due to traffic fluctuations, etc., the band of the 11 variable filters and the conversion frequency band of the 12 variable frequency converters are changed. Control at this time is performed by the 140 controller.

In channel assignment when communicating between earth stations using the satellite device of the present invention, the transmission frequency of each earth station is within the frequency band of the satellite reception beam to which it belongs and the satellite transmission beam to which the other station belongs. Channels within the frequency band being exchanged are used.

(Effects of the Invention) As explained above, the present invention provides 5C with multiple beams.
This simplifies the exchange device mounted on the satellite in the satellite communication system using the PC system, and has the advantage that the satellite can be made smaller and lighter.

[Brief explanation of drawings]

FIG. 1 is an example of a conventional satellite-mounted device, and FIG. 2 is a block diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Receiving section input terminal, 2... Receiving section, 3... Channel splitter, 4... Demodulator, 5... Exchange, 6
... Exchange controller, 7... Modulator, 8... Channel combiner, 9... Transmitter, 10... Transmitter output terminal, 11... Variable band pass filter, 12... - Variable frequency converter, 13... combiner, 14... controller. Patent applicant Nippon Telegraph and Telephone Public Corporation Patent application agent Megumi Yamamoto −

Claims (1)

[Claims] Using a frequency division multiple access system that allocates one carrier to one voice channel, in a satellite communication system using multi-beams, each receiver output signal of the received multi-beams is divided into frequency bands by a filter. , allocate the transmission beams to be connected for each of these band-divided signals, frequency-convert the equal band-divided signals of the transmission beams so that their bands do not overlap, and then combine them.The combined signal is used as the transmitter input, and each A satellite-mounted device characterized in that, as a transmission frequency of an earth station, a channel within a frequency band of a satellite reception beam to which the earth station belongs is exchanged with a satellite transmission beam to which a partner station belongs.