JP3623192B2 - Continuous transmission control system for satellite communication system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control system used for compensation / correction of signal intensity attenuation by regional weather information in each service area in a satellite communication system that communicates or broadcasts to a plurality of service areas via a satellite.
[0002]
[Prior art]
In conventional satellite communication systems, in satellite communication or satellite broadcasting, rainfall attenuation, which is one of radio wave interference information that leads to radio attenuation of communication or broadcasting, is estimated in advance by a statistical method, and the target line availability is determined. A radio wave of a certain strength that expects an estimated value of the amount of rain attenuation to be satisfied is radiated from the satellite to the earth station or from the earth station to the satellite. Giving a margin in consideration of this amount of rain attenuation is called a rain margin. The conventional communication / broadcasting satellite, which expects a fixed margin of radio interference to ensure the quality of communication or broadcasting, is based on the estimated value, so it actually estimates that there is a lot of rainfall. The rain margin due to has not been able to compensate for the amount of rain attenuation, and there were areas where the rain margin was not needed in fine weather, and the limited power of the satellite was not used effectively.
[0003]
Therefore, a satellite communication system in which power control is performed based on an actual rainfall amount without using an estimated value of the rain attenuation is disclosed in Japanese Patent Laid-Open No. 5-41683.
FIG. 5 is a block diagram showing a conventional satellite communication / broadcast power control system described in Japanese Patent Laid-Open No. 5-41683. In the figure, A, B, and C are a plurality of, for example, three service areas that receive communication or broadcast radio waves, Sa, Sb, and Sc are local weather information such as rainfall in each of the service areas A, B, and C, and Sd is each Total weather information obtained by gathering the local weather information Sa, Sb, Sc received from the service areas A, B, C, S1 is transmission power control information, 1 is a local weather information collection and distribution organization, 2 is a computing device, 3 is Satellite control station, 4 is a satellite, 5 is a multi-beam antenna, T1 is a radio wave that transmits transmission power control information S1 to the satellite 4, Ta, Tb, and Tc are for a plurality of communication or broadcast service areas A, B, and C Communication radio wave or broadcast radio wave. Here, transmission power corresponding to the rain margin expected for each of the service areas A, B, and C among the total transmission power supplied to the antenna in the satellite is set in advance. The total transmission power corresponding to the rain margin set for each service area in all service areas is used as the rain attenuation compensation transmission power.
[0004]
Next, the operation will be described. The local meteorological information Sa, Sb, Sc of each service area A, B, C is immediately or intermittently obtained as the aggregated weather information Sd of each service area A, B, C via the local meteorological information collection and distribution agency 1. Is input to the arithmetic unit 2. Based on the total weather information Sd, the arithmetic device 2 derives information for distributing and distributing rainfall attenuation compensation transmission power to the service areas A, B, and C, that is, transmission power control information S1. At this time, the transmission power for rain attenuation compensation is preferentially allocated to service areas A, B, and C where the degradation of the line quality due to rain is predicted to be greater. The transmission power control information S1 obtained by the arithmetic device 2 is transmitted to the satellite 4 as a radio wave T1 for transmitting the transmission power control information via the satellite control station 3. The satellite 4 controls transmission power for each service area A, B, C based on the transmission power control information S1 transmitted by the radio wave T1, and multi-beams communication radio waves or broadcast radio waves Ta, Tb, Tc for each service area. Radiates from the antenna 5.
[0005]
[Problems to be solved by the invention]
Conventionally, the configuration is as described above. If the amount of rainfall is excessive, the limit of the transmission power for rain attenuation compensation may be exceeded. Thus, when the amount of rain attenuation due to the increase in rainfall cannot be compensated for by increasing the transmission power, there is a problem that the line quality deteriorates, the signal strength is attenuated, and information is lost.
[0006]
The present invention has been made to solve the above-described problems, and even when the amount of rainfall exceeds the limit of transmission power for rain attenuation compensation, it is possible to compensate for signal strength attenuation and deliver information to a service area. It is an object to obtain a continuous transmission control method of a highly reliable satellite communication system.
[0007]
[Means for Solving the Problems]
The continuous transmission control method of the satellite communication system according to the present invention provides information on the amount of radio interference related to the local weather in each service area that leads to attenuation of communication or broadcast radio waves when communicating or broadcasting to a plurality of service areas via a satellite. Based on the above, the continuous transmission number setting means for setting the continuous transmission frequency to each service area, the continuous transmission interval setting means for setting the time interval of the continuous transmission, and the set continuous transmission frequency and continuous transmission interval . As described above, it is characterized by comprising continuous transmission number continuous interval control means for controlling the number of continuous transmissions from the satellite to each service area and the continuous transmission interval .
[0008]
Further, in the continuous transmission control system of the satellite communication system according to the present invention, the radio disturbance amount information related to the local weather is a rainfall amount, and the continuous transmission count setting means is configured to determine the local transmission frequency setting means for each service area. When the transmission power for compensating the rain attenuation amount due to the rainfall amount cannot be secured, the number of continuous transmissions is set so as to compensate for the rain attenuation amount.
[0009]
Further, in the continuous transmission control system of the satellite communication system according to the present invention, the radio disturbance amount information related to the local weather is a rainfall amount, and the continuous transmission count setting means is configured to determine the local transmission frequency setting means for each service area. The transmission power and the number of continuous transmissions are set so as to compensate for the rain attenuation due to the rainfall, and the transmission power from the satellite to each service area is set to the set transmission power. To do .
[0010]
Further, the continuous transmission interval setting means in the continuous transmission control system of the satellite communication system according to the present invention sets the continuous transmission time interval based on the wind speed of the local weather.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Reference Example 1
FIG. 1 is a configuration diagram illustrating a main part of a satellite communication system according to Reference Example 1 . In the figure, A, B, and C are a plurality of, for example, three service areas that receive communication or broadcast radio waves, Sa, Sb, and Sc are local weather information of service areas A, B, and C, and Sd is each service area A. , B, and C are all meteorological information gathered from local weather information Sa, Sb, and Sc, S10 is transmission power / continuous transmission control information for each service area A, B, and C, and 1 is local meteorological information collection and distribution Organization, 3 is a satellite control station, 4 is a satellite, 5 is a multi-beam antenna, 10 is a calculation / continuous transmission control device, T1 is a transmission power / continuous transmission control information S10 to each service area A, B, C Radio waves Ta, Tb, and Tc for transmitting transmission power control information to the satellite 4 are communication radio waves or broadcast radio waves for a plurality of service areas A, B, and C for communication or broadcasting. FIG. 2 is a graph for explaining the continuous transmission control method according to Reference Example 1 , in which the horizontal axis indicates the amount of rainfall (mm / h), and the vertical axis indicates the number of continuous transmissions (times).
[0012]
When communicating or broadcasting to a plurality of service areas via a satellite, signal strength attenuation of communication or broadcast radio waves occurs due to radio wave interference related to local weather in each service area.
[0013]
In the reference example 1 , for example, the rainfall amount in the local weather is the amount of radio interference that causes attenuation of communication or broadcast radio waves. For this reason, the signal intensity attenuation to each service area A, B, C is calculated based on the rainfall information of the local weather in each service area A, B, C, and to the antenna in the satellite according to this signal intensity attenuation. The total amount of transmission power to be distributed is distributed and distributed so as to compensate or correct the signal strength attenuation.
[0014]
Next, the operation of the reference example 1 will be described. In FIG. 1, the regional weather information Sa, Sb, Sc of each service area A, B, C is collected through the local weather information collection and distribution agency 1, and the total weather information of each service area A, B, C is collected. Sd is input to the calculation / continuous transmission control device 10 immediately or intermittently. The calculation / continuous transmission control device 10 creates information for allocating the transmission power for rain attenuation compensation to the service areas A, B, and C based on the total weather information Sd.
That is, the total transmission power supplied to the antenna in the satellite includes transmission power corresponding to a margin (rainfall margin) provided in consideration of the rain attenuation amount of each service area A, B, C. All or part of the transmission power is used for rain attenuation compensation for all service areas. Information that preferentially distributes and distributes the transmission power for rain attenuation compensation to the service areas A, B, and C that are predicted to have a greater degradation of the line quality due to the rain, that is, transmission power control. Guide information. If transmission power that compensates for rain attenuation in all service areas can be secured, continuous transmission control information is created with the number of continuous transmissions in each service area set to one.
[0015]
Next, a case where there is a large amount of rainfall in any one or a plurality of service areas, and transmission power for compensating for rain attenuation in all service areas cannot be secured by transmission power for rain attenuation compensation will be described. When creating information for allocating transmission power for rain attenuation compensation to each service area A, B, C based on the rainfall information of all weather information Sd, for example, corresponding to the rain margin in order from the service area with the least rainfall The transmission power to be distributed is distributed and distributed. The number of consecutive transmissions is set to one for a region where transmission power for compensating for the rain attenuation amount can be secured among a plurality of service regions.
Also, for service areas that cannot secure transmission power to compensate for the rain attenuation amount among a plurality of service areas, as shown in FIG. Control information. The transmission power control information of this service area may be a reference value of transmission power, or if there is still rain attenuation compensation transmission power, a transmission power obtained by adding the reference value to this may be set.
[0016]
The information set in this way is transmitted to the satellite control station 3 as transmission power / continuous transmission control information S10. In the satellite control station 3, continuous transmission control is performed based on the continuous transmission control information, but the transmission power control information is transmitted to the satellite 4 as the radio wave T1, and the satellite 4 transmits the transmission power control information transmitted by the radio wave T1. Based on the above, the transmission power for each service area A, B, C is controlled, and communication waves or broadcast waves Ta, Tb, Tc for each service area are radiated from the multi-beam antenna 5.
[0017]
As shown in FIG. 2, the continuous transmission control compensates for the rain attenuation by initially increasing the transmission power by increasing the transmission power to 1 as the rainfall increases. If transmission power that compensates cannot be secured, the number of continuous transmissions is increased to 2 or 3.
[0018]
Furthermore, not only can the number of continuous transmissions be increased in accordance with the amount of rainfall, but also the number of continuous transmissions can be set in consideration of the importance of information to be transmitted, for example. That is, the error rate at the rainfall rate x is set to α, the error allowable rate is set to β, and the continuous transmission count y is set to satisfy the following equation.
α ^y <β
Here, x means the rainfall rate (mm / h), the error rate α = BER (Bit Error Rate), and the error allowable rate β = the allowable limit value of BER.
If the error rate at the time of the rainfall rate x is α and the allowable error rate is β and stored in advance in the calculation / continuous transmission control device 10, it is continuously transmitted by calculating the rainfall rate x from the total rainfall information Sd. The number of times y can be set.
If the error tolerance β in the above equation is set according to the importance of the information, etc., the number of consecutive transmissions y will also change according to the importance of the information, and it can compensate for rain attenuation and ensure particularly important information. Can communicate with.
[0019]
In the continuous transmission control based on FIG. 2 described above, when the number of continuous transmissions is one, the transmission power is increased to compensate for rain attenuation, and when the number of continuous transmissions is two or more, the rainfall amount is constant. As the transmission power. On the other hand, the transmission power may be changed in consideration of rain attenuation even when the number of continuous transmissions is two or more. By changing the transmission power even when the number of consecutive transmissions is two or more, it is possible to set the transmission power and the number of consecutive transmissions more suitable for rain attenuation, so that information can be transmitted reliably and transmission power can be saved. be able to.
[0020]
Further, when the transmission power / continuous transmission control information S10 is created by the arithmetic / continuous transmission control device 10, it may be set as shown in FIG. FIG. 3 shows continuous transmission control in one service area, with the horizontal axis representing rainfall (mm / h) and the vertical axis representing the number of continuous transmissions and transmission power. The solid line in the graph is the number of continuous transmissions, and the dotted line is the transmission power. The maximum value of the transmission power is a predetermined transmission power that can be secured in this service area. Using the graph shown in FIG. 3, the number of continuous transmissions and transmission power, which are y-axis values, are determined from the x-axis values at a certain amount of rainfall. This control method does not increase the number of continuous transmissions when the transmission power for compensating the rain attenuation in all service areas cannot be secured by the transmission power for rain attenuation compensation, but it is optimal according to the rainfall at that time in a certain area. Set the appropriate transmission power and number of continuous transmissions. For this reason, transmission power and the number of continuous transmissions more suitable for rain attenuation can be set, information can be transmitted reliably, and transmission power can be saved.
[0021]
In addition, as radio wave interference amount information of regional weather information Sa, Sb, Sc and weather information Sd, AMeDAS (Amedas) hourly hourly precipitation provided by the Japan Meteorological Agency, radar AMeDAS combined precipitation, precipitation short-term forecast Etc. are considered. As the regional meteorological information collection and distribution organization 1, the Japan Meteorological Agency, Japan Meteorological Association, private weather information companies, etc. can be considered.
In addition to the rainfall amount, the radio wave interference amount information related to the weather information Sd may include snowfall, wind power, temperature, humidity, heavy fog, lightning strike, etc. By setting the number of times of continuous transmission and performing continuous transmission, a satellite communication system capable of preventing line deterioration can be obtained.
[0022]
Embodiment 1 FIG .
FIG. 4 is a graph for explaining the continuous transmission control method of the satellite communication system according to the first embodiment of the present invention, showing the time interval control of continuous transmission in one service area, and the horizontal axis represents wind speed (km / h). ), The vertical interval indicates the continuous transmission interval (minutes).
In Reference Example 1 , when continuous transmission control is performed, continuous transmission is performed without taking a continuous transmission time interval. However, in the first embodiment, a continuous transmission time interval is set and a predetermined time is set. It is controlled to send continuously. Here, the configuration of the satellite communication system, the setting of the number of continuous transmissions, and the like are the same as those in Reference Example 1 .
[0023]
For example, even if the calculation / continuous transmission control device 10 of Reference Example 1 sets the number of continuous transmissions so as to compensate for rain attenuation, the rain cloud is stagnant when the wind speed is slow, and it is the same no matter how many times it is sent. That could be a problem. In such a case, in order to perform continuous sending after the rain cloud moves, in this embodiment, the time interval is set based on the wind speed. That is, as shown in FIG. 4, when the wind speed is slow, the continuous transmission interval is set long. On the other hand, when the wind speed is high, the movement of the rain clouds is fast, so even if it is sent continuously, there are actually multiple receiving stations in the service area, and information is received at a receiving station different from the previous one in that service area. Can be delivered. Therefore, the continuous transmission interval is set shorter as the wind speed increases. The wind speed of each service area at this time is included in the weather information Sa, Sb, Sc of each service area A, B, C collected in the local weather information collection and distribution organization 1, as shown in FIG. The weather information Sd is a set of regional weather information of a plurality of service areas sent to the calculation / continuous transmission control device 10.
The information on the continuous transmission time interval set in this way is transmitted to the satellite control station 3 as transmission power / continuous transmission control information S10. In the satellite control station 3, continuous transmission interval control is performed based on the continuous transmission interval control information.
Thus, in the calculation / continuous transmission control device 10, by changing the continuous transmission interval according to the situation, information can be transmitted reliably, and the reliability of the satellite communication system can be improved.
[0024]
In the above description, the continuous transmission interval is changed according to the wind speed. However, the continuous transmission time interval may be set longer in a time zone where communication radio waves are crowded. Further, for example, the communication status may be detected at regular time intervals and transmitted when the crowded state is resolved.
In the above description, the number of service areas is three, A, B, and C. However, the present invention is not limited to this.
[0025]
【The invention's effect】
As described above, according to the present invention, when communicating or broadcasting to a plurality of service areas via a satellite, the radio disturbance amount information related to the local weather in each service area that leads to attenuation of communication or broadcast radio waves is used. The continuous transmission number setting means for setting the number of continuous transmissions to each service area, the continuous transmission interval setting means for setting the time interval of the continuous transmission, and the set number of continuous transmissions and the continuous transmission interval. And a continuous transmission time continuous interval control means for controlling the continuous transmission frequency and the continuous transmission interval from the satellite to each service area, so that even when the attenuation of radio waves cannot be compensated by the transmission power, the information can be reliable. higher be delivered to the service area, further, by controlling the successive sending interval of the each service area from the satellite, it is possible to perform continuous transmission control appropriate to the situation, the satellite communication system capable of improving reliability Continuous transmission control system is obtained.
[0026]
Further, the radio wave interference amount information related to the local weather is rainfall information of the local weather, and the continuous transmission number setting means transmits to each service area to compensate for the rain attenuation amount due to the rainfall of the region. A control system for a satellite communication system that can reliably deliver information to a service area even when rain attenuation cannot be compensated by setting the number of continuous transmissions to compensate for the rain attenuation when power cannot be secured. Is obtained.
[0027]
Further, the radio disturbance amount information related to the local weather is the rainfall amount of the local weather, and the continuous transmission number setting means compensates the rain attenuation amount due to the rainfall amount of the region for each service area. The transmission power and the number of continuous transmissions shall be set, and the transmission power from the satellite to each service area is configured to be the set transmission power, so that it can be set to a transmission power amount suitable for the rainfall amount, A continuous transmission control method for a satellite communication system capable of saving transmission power can be obtained .
[0028]
Furthermore, the continuous transmission interval setting means can perform continuous transmission control suitable for the situation by setting the continuous transmission time interval according to the wind speed of the local weather, and can further improve reliability. Can be obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a main part of a satellite communication system in Reference Example 1. FIG.
FIG. 2 is a graph illustrating the control method according to Reference Example 1 , and is a graph showing the number of times of continuous transmission with respect to rainfall in one service area.
FIG. 3 is a graph for explaining another control method according to Reference Example 1 and showing the number of continuous transmissions and transmission power with respect to rainfall in one service area.
FIG. 4 is a graph for explaining a control method according to Embodiment 1 of the present invention, and is a graph showing a continuous transmission interval with respect to wind speed in one service area;
FIG. 5 is a block diagram showing a main part of a conventional satellite communication system.
[Explanation of symbols]
1 Regional meteorological information collection and distribution organization 3 Satellite control station 4 Satellite 10 Arithmetic / continuous transmission control device A, B, C Communication or broadcasting service area Sa, Sb, Sc Local weather information Sd of each service area A, B, C Weather information S10 that collects regional weather information of a plurality of service areas. Transmission power / continuous transmission control information.

Claims (4)

When communicating or broadcasting to multiple service areas via satellite, set the number of continuous transmissions to each service area based on the radio disturbance amount information related to the local weather of each service area that leads to attenuation of communication or broadcast radio waves And a continuous transmission interval setting means for setting a time interval of the continuous transmission, and a continuous transmission from the satellite to each of the service areas so that the set number of continuous transmissions and the continuous transmission interval are obtained. A continuous transmission control method for a satellite communication system, comprising: a continuous transmission number continuous interval control means for controlling a frequency and a continuous transmission interval . When the radio wave interference amount information related to the regional weather is the rainfall amount, the continuous transmission count setting means cannot secure transmission power for the service area to compensate for the rain attenuation amount due to the rainfall amount in the region, The continuous transmission control method for a satellite communication system according to claim 1, wherein the number of continuous transmissions is set so as to compensate for the rain attenuation. The radio wave interference amount information related to the local weather is the rainfall amount, and the continuous transmission number setting means transmits the transmission power and the continuous transmission so as to compensate the rain attenuation amount due to the rainfall amount of the local region for each service area. 2. The continuous transmission control method for a satellite communication system according to claim 1, wherein the number of times is set, and the transmission power from the satellite to each service area is set to the set transmission power. The continuous feeding interval setting means, continuous transmission control system for a satellite communication system according to claim 1, wherein setting the time interval between successive sending on the basis of wind speed of the local weather.

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