JPH0465927A - System and equipment for satellite switching monitoring - Google Patents

Abstract

PURPOSE:To specify a faulty route by monitoring the operation based on the detection state transferred from a satellite switching monitoring device, a switching pattern and a burst transmission pattern. CONSTITUTION:When a fault takes place in the connection, e.g., from a D beam to a C beam, two bursts are unable detected, a satellite switching monitoring device 100 installed in a zone of the C beam reports the undetection state of two bursts to a central processing unit 300. Moreover, when a fault takes place in all up beams of a zone D, the undetection state of all bursts sent from the zone D is reported to the central processing unit 300. Furthermore, when a station is faulty and the burst is lost, the monitoring device 100 for the C beam reports the undetection state of the burst but the undetection state of the burst is reported from the other zones and the occurrence of a fault in the station is discriminated. Thus, whether the fault occures due to the abnormality switching operation or to the fault in the TDMA station is accurately decided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a satellite switching monitoring system and a satellite switching monitoring apparatus for monitoring the operation of a switch matrix on a satellite in an SS-TDMA satellite communication system.

[Conventional technology]

In a general TDMA satellite communication system, TDMA frames, which are periods of time divided periodically on a satellite, are considered, and this TD
The MA frame is time-divided and assigned to each earth station, and each earth station transmits its own burst within its allocated time.

In a typical TDMA satellite communication system, if the satellite is a multi-beam satellite with multiple beams, a burst sent by a certain earth station is transmitted to a certain fixed beam via a repeater on the satellite. Therefore, communication between earth stations without beam-to-beam connection was impossible, and repeaters were not always used efficiently due to changes in transmission capacity between connected beams. .

On the other hand, in the SS-TDMA satellite communication system, a repeater that covers a plurality of beams is mounted on a satellite, and a matrix switch that can switch connections between the beams of this repeater in a time-division manner is mounted. In addition, the satellite is equipped with a clock source, and based on the clock generated by this clock source, the matrix switch uses the same period as the TDMA frame generated by the earth station TDMA device (to distinguish this period from the TDMA frame). (called a switch frame) switches the connections between the multiple beams of the satellite repeater.

In such an SS-TDMA satellite communication system, the earth station TDM
The TDMA frame generated by the A device and the switch frame serving as the switching reference for the matrix switch of the satellite repeater are synchronized by a synchronization maintenance device provided in the reference station.

[Problem to be solved by the invention]

If the matrix switch on the satellite fails while the TDMA frame timing and switch frame timing are synchronized as described above, it is very difficult to find the location of the failure.

Generally, a matrix switch mounted on a satellite has multiple switch elements, such as PIN diodes, arranged in a matrix, and is synchronized with the switch frame timing that runs freely based on the clock source mounted on the satellite. The up beams of the up beams can be connected to any one or more down beams at any time during the frame. Therefore, if communication via a specific connection of a matrix switch becomes unavailable during a specific time period, is the cause due to a failure on the earth station side within the TDMA network or a failure on the satellite side? It is difficult to judge. Furthermore, even if it is determined that the cause is a failure on the satellite side, it is extremely difficult to identify the route of the failure.

On the other hand, this matrix switch generally has a redundant system, and if a certain route fails, it is possible to switch that route to a backup route. Therefore, in the SS-TDMA satellite communication system, it is necessary to install some kind of device for monitoring the operation of this matrix switch.

The present invention was made by focusing on the problems of the conventional SS-TDMA satellite communication system, and its purpose is to provide a system for monitoring the operation of a satellite matrix switch, and a main device of this system. An object of the present invention is to provide a satellite switching monitoring device.

[Means to solve the problem]

In the satellite switching monitoring system of the present invention, a plurality of slave stations communicate in a burst manner via a multi-beam satellite that switches connections between a plurality of beams by a switch matrix, and at least one reference station communicates with the reference station via the multi-beam satellite. demodulation means for demodulating all the received bursts, at least one of which is disposed in each of the areas covered by the plurality of beams of the SS-TDMA satellite communication system that controls the slave station; and demodulation means for demodulating all the received bursts; burst detection means for detecting a reference burst sent by the reference station and a slave burst sent by the slave station from demodulated output;
reception timing means for generating a frame timing based on the timing of the reference burst detected by the burst detection means; and a reception timing means for storing the detection state of the slave burst by the burst detection means at the cycle of the frame timing from the reception timing means. a satellite switching monitoring device comprising: storage means for storing for a predetermined period of time; and transmission means for transmitting the detected state stored in the storage means for each predetermined period; a data link for transmitting the detection state sent by the transmitting means; the detection state transferred from each of the satellite switching monitoring devices via these data links; the switching pattern of the switch matrix stored in advance; and a central processing unit that monitors the operation of the switch matrix based on the burst transmission pattern of each slave station.

In the satellite switching monitoring device of the present invention, a plurality of slave stations communicate in a burst manner via a multi-beam satellite that switches connections between a plurality of beams by a switch matrix, and at least one reference station communicates with the reference station via the multi-beam satellite. demodulation means for demodulating all the received bursts, at least one of which is disposed in each of the areas covered by the plurality of beams of the SS-TDMA satellite communication system that controls the slave station; and demodulation means for demodulating all the received bursts; burst detection means for detecting a reference burst sent by the reference station and a slave burst sent by the slave station from demodulated output; and reception timing means for generating frame timing based on the timing of the reference burst detected by the burst detection means; storage means for storing the detection state of the slave burst by the burst detection means at the cycle of the frame timing from the reception timing means and holding it for a predetermined period; and a transmitting means for transmitting data every period.

The reception timing means generates a window signal indicating the timing at which the slave burst should be received based on the timing of the reference burst from the burst detection means and externally given position information of the slave burst, and generates a window signal indicating the timing at which the slave burst should be received, and The burst detecting means may be configured to determine whether or not the slave burst is detected at the timing of the window signal, and to store the determination result as the detection state of the slave burst.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the satellite switching monitoring device of the present invention, and FIG. 2 is a block diagram showing an embodiment of the satellite switching monitoring system of the present invention using the embodiment shown in FIG. be.

First, the satellite switching monitoring device 100 shown in FIG. 1 will be explained.

In FIG. 1, a received signal 10 received by a satellite switching monitoring device 100 is input to a demodulation circuit 2, and received burst information 12 demodulated and converted into a digital signal is input to a burst signal detection circuit 3.

The burst signal detection circuit 3 detects a reference burst from the received burst information 12 and outputs a reference burst detection signal 13 to the reception timing generation circuit 4 and the reception burst buffer circuit 5. It also detects a slave burst from the reception burst information 2 and outputs a slave burst detection signal 14 to the reception burst buffer circuit 5.

The reception timing generation circuit 4 establishes the TDMA frame period from the reference burst detection signal 13 and the system clock 11 input from the clock generation circuit 1, and performs TDMA frame period based on the burst position information 17 of all received bursts.
A window signal 16 is generated at a specified position on the A frame, and the window signal 6 is output to the reception burst buffer circuit 5. Further, the generated TDMA frame timing signal 15 is input to the clock generation circuit 1.

The clock generation circuit 1 controls the oscillation frequency of the clock inside the circuit based on the input TDMA frame timing signal 15. This oscillation frequency control allows
The clock of this device can be synchronized with the clock of the TDMA satellite communication system.

On the other hand, the reception burst buffer circuit 5 determines whether or not a burst is received at the position of the input window signal 16 based on the reference burst detection signal 13 and the slave burst detection signal 14, and determines whether the burst is detected or not detected in the internal circuit. Store in memory.

The stored burst detection information 18 is periodically read out by the data interface circuit 6, converted into a format, and then sent out via the data link. The data interface circuit 6 also writes the burst position information 17 input via the data link into the reception timing generation circuit 4.

Next, the satellite switching monitoring system shown in Figure 2
A description will be given of how to monitor the operation of a satellite switch matrix using the satellite switching monitoring device 100 shown in FIG.

In FIG. 2, a satellite switching monitoring device W100 is installed in each of the four zones covered by the SS-TDMA satellite 400 with A beam to D beam,
each central processing unit 30 via a data link 200;
Connected to 0. Satellite 400 switches connections between the four beams in a time-division manner using a switch matrix (not shown).

FIG. 3 is a diagram showing an example of the format of a data packet to be transferred from each satellite switching monitoring device 100 to the central processing unit 300, and FIG. FIG. 3 is a diagram illustrating an example of the format of a plan information packet.

Each satellite switching monitoring device 100 is connected to a central processing area 300
As shown in Figure 3, the data packet transferred to the receiver includes the receiving beam number, the source station number, destination station number, burst number, and burst detection status for all bursts to be received. It is.

As shown in FIG. 4, the plan information packet that the central processing unit 300 loads to each satellite switching monitoring device 100 includes the received palm number and
The source station number, destination station number, burst number, and burst position information for all bursts to be received are included.

FIG. 5 is a diagram showing an example of a switching pattern of the switch matrix of the satellite 400.

In Figure 5, the station numbers are in the 10s for stations in the A beam zone, the 20s for stations in the B beam zone, and so on, and the burst numbers are for the source and transmitter. This number has been simplified by combining the previous station numbers.

FIG. 6 shows a satellite switching monitoring device 100 for the C beam zone corresponding to the satellite switching pattern of FIG.
FIG. 3 shows the bursts to be received;

In the example of FIGS. 5 and 6, if a failure occurs only in the connection from the D beam to the C beam, burst number 403
Two bursts, 0 and 4131, become undetectable. In that case, the central processing unit 300 has the above-mentioned two
Satellite switching monitoring device 10 installed in the other 3 beam zones where burst non-detection status is reported
No failures are reported from 0.

Further, for example, if a failure occurs in all the up beams of the D zone, the non-detection state of all the bursts sent out from the D zone will be transmitted from the satellite switching monitoring device 100 installed in each beam zone to the central processing unit 300. The central processing unit 300 can determine that there is a failure in the up beam of the D beam of the satellite 400 from zone to zone.

In addition, if the burst disappears due to a failure in the station number 40 rather than a failure in the satellite 100, the satellite switching monitoring device 100 in the C beam zone will report the non-detection state of burst number 4030 to the central processing unit W300. However, the satellite switching monitoring device 100 installed in another zone also reports that the burst from the station with station number 40 is not detected, and the central processing unit 300 determines that the failure is not caused by the satellite 100. It can be determined that the occurrence occurred at station number 40.

〔Effect of the invention〕

As explained above, the present invention can monitor the switching operation of a satellite in an SS-TDMA satellite communication system, and can accurately determine whether there is an abnormality in the switching operation or a failure in the TDMA station. Furthermore, even in the unlikely event that a failure occurs, it is possible to quickly switch to a standby system based on this determination result.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the switching monitoring device of the present invention, FIG. 2 is a block diagram showing an embodiment of the satellite switching monitoring system of the present invention, and FIG. 3 is an embodiment shown in FIG. 2. At each satellite switching monitoring device 10
0 is a diagram showing the format of a data packet transferred to the central processing unit 300, and FIG.
0 shows the format of the plan information packet loaded into each satellite switching monitoring device 100, FIG. 5 shows an example of the switching pattern of the switch matrix of the satellite 400, and FIG. 6 shows the satellite switching pattern of FIG. 5. FIG. 4 shows the bursts to be received by the satellite switching monitoring device 100 in the C-beam zone in response to the C-beam zone. 1... Clock generation circuit, 2... Demodulation circuit, 3...
- Burst signal detection circuit, 4... Reception timing generation circuit, 5... Reception burst buffer circuit, 6... Data interface circuit, 100... Satellite switching monitoring device, 200... Data link, 300 ...Central processing unit, 400...Satellite.

Claims (1)

[Claims] 1. A plurality of slave stations communicate in a burst manner via a multi-beam satellite that switches connections between a plurality of beams by a switch matrix, and at least one reference station communicates with the slave station via the multi-beam satellite. demodulation means for demodulating all received bursts, at least one of which is disposed in each of the areas covered by the plurality of beams of the SS-TDMA satellite communication system for controlling the SS-TDMA satellite communication system; and demodulation means output from the demodulation means burst detection means for detecting a reference burst sent out by the reference station and a slave station burst sent out by the slave station from an output; a reception timing means for generating frame timing based on the timing of the reference burst detected by the burst detection means; storage means for storing the detection state of the slave burst by the burst detection means at the cycle of the frame timing from the reception timing means and holding it for a predetermined period; and storage means for storing the detection state held in the storage means for the predetermined period. a data link for transmitting the detection state transmitted by the transmitting means of each of these satellite switching monitoring means; and a central processing unit that monitors the operation of the switch matrix based on the detection state transferred from each device, the switching pattern of the switch matrix stored in advance, and the burst transmission pattern of each of the slave stations. A satellite switching monitoring system characterized by: 2. SS-TDMA in which a plurality of slave stations communicate in a burst manner via a multi-beam satellite that switches connections between a plurality of beams using a switch matrix, and at least one reference station controls the slave stations via the multi-beam satellite. demodulation means disposed in each of the areas covered by the plurality of beams of the satellite communication system, demodulating all the received bursts, and the reference station transmitting the demodulation output from the demodulation output output from the demodulation means. a burst detection means for detecting a reference burst transmitted by the slave station and a slave station burst sent by the slave station; a reception timing means for generating a frame timing based on the timing of the reference burst detected by the burst detection means; Storage means for storing the detection state of the slave burst by the burst detection means at a frame timing period and holding it for a predetermined period; and a transmission means for transmitting the detection state held in the storage means every predetermined period. A satellite switching monitoring device characterized by comprising: 3. The reception timing means generates a window signal indicating the timing at which the slave burst should be received based on the timing of the reference burst from the burst detection means and externally given position information of the slave burst, and 3. The satellite switching system according to claim 2, wherein the storage means determines whether or not the burst detection means detects the slave burst at the timing of the window signal, and stores the determination result as the detection state of the slave burst. monitoring equipment.