JPS5997238A - Switching connection system of satellite up line - Google Patents

Abstract

PURPOSE:To switch lines between different systems, by connecting plural IF band or RF band switches through a demodulating circuit, a speed converting circuit, and a modulating circuit. CONSTITUTION:Between a system A consisting of up lines 111-11n and down lines 121-12n connected to a changeover switch 13 of the IF band and a system B consisting of up lines 11'1-11'n and down lines 12'1-12'n connected to a changeover switch 20 of the IF band, up lines of the system A (B) are connected to down lines of the system B (A) besides switching in each system. For example, the up line 112 of the system A is connected to a demodulating circuit 14 and is connected to the changeover switch 20 through a speed converting circuit 16 and a modulating circuit 18. The speed converting circuit 16 is provided for converting the signal form, the signal speed, etc. between different systems.

Description

[Detailed Description of the Invention] Conventionally, as a method of switching and connecting between multiple upper 9 lines and multiple down lines using a changeover switch mounted on the system, switching is performed using the IF band or RF band signal as it is. There are two types of switching methods: one is a switching method in which the F band or RF band is switched, and the other is a baseband switching method in which the uplink signal is demodulated and converted to a baseband signal, and then switching is performed in the baseband.

FIG. 1 is a block diagram showing the configuration of an IF band or RF band switching system, in which 11 to IN are upper multi-line lines, 21 to
2N is a lower multiline line, 3 is an IF band or RF band switch, 4 is a switching control line, and 5 is a line control circuit. According to the control information sent, the line control circuit 5 drives the IF band or RF band changeover switch 3 to switch the upper multi-line 11.
~IN and the lower multiline lines 21 to 2N select and connect the other party line.

In FIG. 1, the upper multiline 11~IN and the lower multiline 21~IN
In order to connect 2N in any combination and perform communication, the modulation method, signal speed, and signal format of the upper 9 lines 11 to IN and the lower lines 21 to 2N must match.
The drawback was that it was not possible to switch lines between different systems.

Figure 2 is a block diagram of the baseband switching system, where 1'l to 1'N are uplinks, 2'1 to 27N are downlinks, 4' is a switching control line, and 5' is a line control line. 6 is a demodulation circuit, 7.8 is a speed conversion circuit, 9 is a modulation circuit, and 10 is a baseband changeover switch.

In FIG. 2, a baseband changeover switch 10
is driven by a line control circuit 5' that operates according to control information sent from the ground station via the switching control line 4', and connects the upper nine lines 1'1 to IIN and the lower multiple lines 2/l.
-2'w is selected and connected.

In Fig. 2, the signals of upper multiple lines 1'1 to 1'N are
Even if the 2's to 2'H signals have different modulation methods, signal speeds, and signal formats, after being demodulated by the demodulation circuit 6, they are converted to a constant signal speed and signal format by the speed conversion circuit 7. After being arranged in the form of a baseband signal and switched by the baseband changeover switch 10, it is further passed through a speed conversion circuit 8 and a modulation circuit 9, and then transmitted to the downlink 2/1 to 2.
'w, so line switching between different systems can be performed.

However, since the proportion of parts other than the switch is large and the circuit scale is large, the weight and power consumption are large, and the reliability is inferior to the IF band or RF band switching method. .

In addition, since demodulation and modulation must be performed on all lines, the same amount of hardware is required regardless of the proportion of the total communication traffic between different systems. There was a drawback.

In order to solve these shortcomings, the present invention aims to provide a method that enables line switching between different systems using relatively small-scale hardware, and it is an object of the present invention to provide a method that enables line switching between different systems using relatively small-scale hardware. These are connected via a demodulation circuit, a speed conversion circuit, and a modulation circuit.

The drawings will be explained in detail below.

FIG. 3 is a block diagram of an embodiment of the present invention, in which 4N
is the switching control line, 5″ is the line control circuit, 111~
11 N and 11'1 to 11'w are upper multiline lines, 1
21-12 N and 12'1-12'N are lower υ lines,
13 is an IF band changeover switch, 14.15 is a demodulation circuit, 16.17 is a speed conversion circuit, 18.19 is a modulation circuit, and 20 is an RF band changeover switch. Upper multiline lines 111 to 11N and lower multiline line 1 connected to changeover switch 13
The group 21 to 12N is system A, and the uplink lines 11'l to 11 connected to the switch 20 for the F band are
'N and the group of lower multiple lines 12'1 to 12'N is referred to as system B.

As shown in FIG. 3, in this embodiment, in addition to switching within each system A or B, the upper multi-line of system A is switched to the down link of system B, or the upper multi-line of system B is switched to the lower link of system A. It is possible to connect to the lower line.

For example, to connect system A's uplink line 112 to system B's lower line 12'1, system A's upper) line 1
12 is connected to the IP band changeover switch 13 and to the demodulation circuit 14 as shown by the dotted line.

The demodulation circuit 14 includes a speed conversion circuit 16 and a modulation circuit 18.
It is connected to the IP band changeover switch 2o via the IP band changeover switch 2o. The IF band changeover switch 2o connects it to the downlink line 12'1 of the system B as shown by the dotted line.

Through the above operations, the upper multi-line 112 of system A is connected to the lower multi-line 12'1 of system B.

In the above connection route, the demodulation circuit 14 demodulates the signal of the upper multiline 112 of the system A, and the speed conversion circuit 16
The speed conversion circuit 16 converts this into system B.
The signal format, signal speed, etc. are converted so as to be compatible with the above, and the signal is output to the modulation circuit 18. The modulation circuit 18 is expanded to convert this signal into a signal using the same modulation method as other signals of system B.

Therefore, even if system A and system B have different modulation methods, signal speeds, and signal formats, line connection between the two systems is possible.

The IF band changeover switch 13.20 receives a control signal from the line control circuit 5'' that receives control information sent from the control device located at the ground station via the changeover control line 4'. driven by.

In this embodiment, the case of switching in the IF band between systems with different modulation methods, signal speeds, signal formats, etc. is shown, but the present invention is applicable to switching between RF bands or between an RF band and an IF band. Switching is also possible.

As explained above, the present invention provides a demodulation circuit that connects a line that needs to be connected to a different system among the lines accommodated in an IF band or RF band changeover switch with a changeover switch of a different system. It connects to other systems via speed conversion circuits, modulation circuits, etc. Within the same system, the original signal of the IF band or μF band can be switched and connected, and the connection between different systems is simple. In this case, the modulation method, speed, format, etc. of the signal are adapted to the partner system through the route.

Therefore, it is only necessary to provide demodulation circuits, speed conversion circuits, and modulation circuits in quantities that correspond to the amount of communication between different systems.
It is possible to realize switching connections between different systems with a simple configuration, and has the advantage of providing a highly reliable switching method with a small amount of hardware.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an IF band or RF band switching method, FIG. 2 is a block diagram of a baseband switching method, and FIG. 3 is a block diagram of an embodiment of the present invention. 11~IN, l'1~1'N...Upper line, 21~2m, 2'1~2',...Lower line, 3. ...... IF band or RF band switching switch, 4.4', 4'...... Switching control line, s, 5', s''.・・・・・・・・・Line control circuit, 6・・・・・・・・・Demodulation circuit, 7, 8・
......Speed conversion circuit, 9...
Modulation circuit, IO...Baseband changeover switch, 111~llN-11'l~11'N・
・・・・・・Upper line, 121-12 N+ 1.
2 '1~12' Plexus...Lower line, 13
...... IF band changeover switch, 14.
15... Demodulation circuit, 16, 17...
・・・・・・Speed conversion circuit, 18.19・・・・・・
...Modulation circuit, 20... IF band changeover switch

Claims (1)

[Claims] ■F
In satellite communications that switch connections using the band or RF band,
Lines with the same modulation method, signal speed, and signal format are collected into a group, each group is accommodated in a different switch, and a demodulation circuit is connected between the different switches to convert the signal speed and signal format. A satellite line switching connection method characterized by connection via a speed conversion circuit and a modulation circuit.