JP2000091975A - Transmission power control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the quality of communication and broadcasting of an artificial satellite by collecting and processing information on the reception states of down lines of facilities for ground station communication line transmission in respective areas and determining the transmission EIRP of the optimum up link of the facilities for ground station communication line transmission, and controlling the communication line transmitting device of a ground station. SOLUTION: An individual variation quantity process part 14 subtracts the proper reception level value of respective ground station communication line receiving facilities 3 from received power level data 13 after unnecessary signal removal and calculates a variation quantity 15 from the optimum reception level value. A variation quantity selecting process part 16 compares calculated variation quantities 15 and outputs variation quantity selection data 17. A variation quantity calculating process part 18 compares a transmission output level after correction for improving the current reception state obtained by adding the variation quantity selection data 17 to the value of a current up link (ground station transmission EIPR) 4 with transmission output range conditions and outputs a transmitted power control signal 10. A transmitted power controller 8 receives the transmitted power control signal 10 and controls the transmitted power of the up link 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control system for controlling the power of radio waves for communication or broadcasting for relaying satellites.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional transmission power control method. In the figure, 1 is an artificial satellite for relaying communication or broadcast radio waves, 2 is a ground station communication line transmitting facility, 3 is a ground station communication line receiving facility, 4 is an uplink (ground station transmission EIRP), 5 is a downlink ( Ground station reception EIRP), 6
Is a radio wave propagation loss factor, 7 is a reception power detection device, 8 is a transmission power control device, and 9 is a reception power level signal.

Next, the operation will be described. The upstream line 4 for communication and broadcasting is transmitted from the terrestrial station communication line transmitting equipment 2 and relayed by the artificial satellite 1 to become the downstream line 5, which is received by the terrestrial station communication line receiving equipment 3 in each place for communication. It is made up. However, the power of the uplink 4 and the downlink 5 is attenuated between the artificial satellite 1 and the ground station communication line receiving equipment 3 mainly due to radio wave propagation loss factors 6 such as rainfall which occur irregularly, and the communication performance is reduced. It may deteriorate and affect communication. Conventional transmission power control is performed by manually operating the terrestrial communication line transmission equipment 2 at the operator's discretion to change the uplink (terrestrial transmission EIRP) 4 or by changing the terrestrial communication line transmission equipment 2. The reception power level of the downlink 5a is detected by the reception power detection device 7 installed along with the ground station communication line reception equipment 3a at the same location as the above, and the transmission power is determined based on the reception power level signal 9 as a result. The controller 8 changes the uplink (ground station transmission EIRP) 4 so as to compensate for the fluctuation in the power of the downlink 5a.

[0004]

As described above, the conventional transmission power control is a countermeasure for compensating the fluctuation amount of the uplink, and a plurality of terrestrial transmissions distributed in various places used for the purpose of communication or broadcasting. No compensation was made for the communication power attenuation occurring in the station communication line receiving equipment. Therefore, if the received power is attenuated due to rainfall in a specific area, it is unavoidable to deteriorate the communication performance of the receiving equipment in that area and stabilize the quality of satellite communication and broadcasting services. Means were needed.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to improve fluctuations in satellite communication performance and unstable elements in satellite communication / broadcasting services, which have been problems in using satellites. Aim.

[0006]

SUMMARY OF THE INVENTION A transmission power control system according to a first aspect of the present invention collects and processes downlink reception status information of a ground station communication line transmission facility in each area to process the ground station communication line transmission. Optimal uplink transmission EI in equipment
It has the function of determining the RP and controlling the communication line transmitter of the ground station.

A transmission power control system according to a second aspect of the present invention collects and processes rainfall intensity information in a ground station communication line transmission facility in each region, and performs optimal uplink transmission EIRP in the ground station communication line transmission facility. And the function of controlling the communication line transmitter of the ground station.

A transmission power control system according to a third aspect of the present invention collects and processes weather information from various places to determine an optimal uplink transmission EIRP in a ground station communication line transmission facility, and transmits the ground station communication line transmission device. Has the function of controlling the In this system, there is no need to provide equipment for collecting information for each of a large number of geographically dispersed ground station communication line receiving equipment,
It can easily cope with the case where new ground station communication line receiving equipment is installed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 denotes an artificial satellite for relaying communication or broadcast waves, 2 denotes a ground station communication line transmitting facility, 3 denotes a ground station communication line receiving facility, and 4 denotes an uplink line. (Earth station transmission EIRP), 5 is downlink (Earth station reception EIR)
P), 6 are radio wave propagation loss factors, 7 is a reception power detection device,
8 is a transmission power control device, 9 is a reception power level signal, 10
Is a transmission power control signal, and 11 is a ground station transmission power processing device.

FIG. 2 shows an example of a method for processing the reception power level signal 9 in the ground station transmission power control device 11. FIG.
The numbers in the symbols indicate the same or equivalent parts as those in FIG.

Next, the operation according to the present invention will be described. Each of the plurality of ground station communication line receiving facilities 3 located at different places is provided with a reception power detection device 7, and the result of detecting the reception power is always transmitted to the ground station transmission power processing device 11 as a reception power level signal 9. Is entered. In the terrestrial station transmission power processing apparatus 11, the amount of fluctuation of the reception level from the appropriate reception power value in each terrestrial communication line receiving equipment 3 due to the radio wave propagation loss factor 6 calculated from the plurality of reception power level signals, and the An appropriate transmission power control amount is calculated based on conditions such as a transmission output level range, and is input to the transmission power control device 8 as a transmission power control signal 10 to perform power control of the uplink 4. However, in a certain ground station communication line receiving facility 3b, the radio wave propagation loss factor 6b
The reception level of the downlink 5b (ground station reception EIR
When P) decreases, the ground station transmission power processor 11 calculates the amount of attenuation from the appropriate reception power value in the ground station communication line receiving equipment 3b based on the reception power level signal 9b. Since the received power fluctuations in the line receiving equipment 3 are different from each other, and when the power of the uplink 4 is changed, the received power of the downlink 5 in the plurality of ground station communication line receiving equipments 3 is changed. In the control in which the fluctuation of the signal 9b is directly compensated by the transmission power control device 8, the optimal control as the whole system is not obtained. In order to calculate the correction amount of the transmission power level from the contents of the plurality of reception power level signals 9 that change every moment, and to obtain an appropriate transmission power control signal 10, the ground station transmission power processing device 11 uses, for example, the configuration shown in FIG. Such processing is performed.

An example of the processing method will be described below. In the ground station transmission power processing device 11, first, for each reception power level signal 9, noise during data communication in the unnecessary signal removal processing unit 12, abnormal reception power detection device itself, or intentional reception power level An unnecessary signal different from the original purpose due to signal fluctuation or the like is removed. Each received power level signal 9
Are output as the received power level data 13 after the removal of the unnecessary signal, respectively, only when the signal has continued for a predetermined time or more and is within the level range of the predetermined data. The individual fluctuation amount processing unit 14 subtracts a preset appropriate reception level value in each of the ground station communication line receiving equipment 3 from the reception power level data 13 after removing the unnecessary signal, and calculates an appropriate reception level value. The variation 15 is calculated. The fluctuation amount selection processing unit 16 compares the calculated plural fluctuation amounts 15 and selects a value having a large amount of decrease (attenuation amount) from the most appropriate reception level value from among the calculated fluctuation amounts 15, and selects the fluctuation amount selection data. 17 is output. If there is no data indicating a decrease from an appropriate reception level value in the fluctuation amount 15, a plurality of fluctuation amounts 15 are compared, and an increase value (increase amount) from the most appropriate reception level value among them is compared. Is selected and output as the variation selection data 17. The fluctuation correction amount calculation processing unit 18 adds the fluctuation amount selection data 17 to the current value of the uplink (terrestrial station transmission EIRP) 4 to correct the current reception situation at the ground station communication line receiving equipment 3. A post-transmission power level 19 is obtained. The corrected transmission output level 19 is transmitted to the transmission level calculation processing section 20 by the
The transmission output upper limit value 21 and the transmission output lower limit value 22, which are predetermined transmission output level range conditions, are compared with the transmission power specified by the Radio Law and the performance of the ground station communication line transmission equipment 2. When the corrected transmission output level 19 is within the range between the upper limit 21 and the lower limit 22, the corrected transmission output level 19 is equal to or larger than the upper limit 21.
However, if the lower limit value is not more than the lower limit value 22, the lower limit value 22 is output to the transmission power control device 8 as the transmission power control signal 10. The transmission power control device 8 continuously receives the transmission power control signal 10 and transmits the uplink (ground station transmission EIRP) 4
Is performed.

Embodiment 2 FIG. FIG. 3 shows a second embodiment of the present invention, in which 1 is an artificial satellite for relaying communication or broadcast waves, 2 is a ground station communication line transmission facility, 3
Is a ground station communication line receiving facility, 4 is an uplink line (ground station transmission EIRP), 5 is a downlink line (ground station reception EIRP), 6
Is a radio wave propagation loss factor, 8 is a transmission power control device, 10 is a transmission power control signal, 11 is a ground station transmission power processing device, 23
Is a rainfall intensity meter, and 24 is a rainfall intensity signal.

FIG. 4 shows an example of a method of processing the rainfall intensity signal 24 in the ground station transmission power control device 11. The numbers in FIG. 4 indicate the same or equivalent parts as in FIG.

Next, the operation of the present invention will be described. A plurality of ground station communication line receiving facilities 3 located in different places are provided with rainfall intensity meters 23, respectively, and the results of detecting rainfall intensity are always input to the ground station transmission power processing device 11 as respective rainfall intensity signals 24. You. It is known that the intensity of radio waves in the up line 4 and the down line 5 in each place is attenuated by rainfall. The amount of attenuation due to rainfall has a correlation with the amount of rainfall (intensity), and it is possible to estimate the amount of attenuation of radio waves from the intensity of rainfall. In the ground station transmission power processing device 11, based on conditions such as a variation from an appropriate reception power value in each ground station communication line receiving facility 3 calculated from the plurality of rainfall intensity signals and a transmission output level range of the ground station, An appropriate transmission power control amount is calculated and input to the transmission power control device 8 as a transmission power control signal 10, and the uplink 4
Power control. In order to calculate the correction amount of the transmission power level from the contents of the plurality of instantaneously changing rainfall intensity signals 24 and obtain an appropriate transmission power control signal 10, the ground station transmission power processing device 11 uses, for example, as shown in FIG. Process.

An example of the processing method will be described below. Inside the ground station transmission power control device 11, first, each rainfall intensity signal 2
4, the unnecessary signal removal processing unit 12 removes an unnecessary signal different from the original purpose due to noise during data communication, an abnormality of the rainfall intensity meter 23 itself, or the like. Only when each rainfall intensity signal 24 lasts for a predetermined time or more and is within a predetermined data level range, each rainfall intensity signal 24 is output as a rainfall intensity signal 25 from which an unnecessary signal has been removed. The amount of attenuation due to rainfall is correlated with the amount of rainfall (intensity), and the amount of attenuation of radio waves can be estimated from the intensity of rainfall. Based on this, a correlation table 26 is created that uniquely indicates the estimated value of the received power level (ground station reception EIRP) of the downlink 5 in each ground station communication line receiving facility 3 with respect to the rainfall intensity value. The above-mentioned correlation table 26 is set in the individual fluctuation amount processing unit 14, and the rainfall intensity signals 25 after removing a plurality of unnecessary signals are respectively processed to obtain the reception power level (ground station reception EIRP) of the downlink 5. An estimated value is obtained, and a variation 15 from each appropriate reception level value is calculated. The fluctuation amount selection processing unit 16 compares the calculated plural fluctuation amounts 15 and selects a value having a large amount of decrease (attenuation amount) from the most appropriate reception level value from among the calculated fluctuation amounts 15, and selects the fluctuation amount selection data. 17 is output. When there is no data indicating a decrease from the appropriate reception level value in the fluctuation amount 15, a plurality of fluctuation amounts 15 are compared, and an increase amount (increase amount) from the most appropriate reception level value among them is compared. Is selected and output as the variation selection data 17. The fluctuation correction amount calculation processing unit 18 converts the fluctuation amount selection data 17 into the current uplink (ground station transmission EIRP).
4 to obtain a corrected transmission output level 19 for improving the current reception status at the ground station communication line receiving equipment 3.
The corrected transmission output level 19 is calculated by the transmission level calculation processor 2
0, compared with the transmission output upper limit value 21 and the transmission output lower limit value 22 which are predetermined transmission output level range conditions due to the transmission power defined by the Radio Law and the performance constraints of the ground station communication line transmission equipment 2. Is done. The corrected transmission output level 19 is within the range of the upper limit 21 and the lower limit 22 when the corrected transmission output level 19 is within the range of the upper limit 21 and the lower limit 22 when the corrected transmission output level 19 is equal to or higher than the upper limit 21. 22 is output to the transmission power control device 8 as the transmission power control signal 10. The transmission power control device 8 continuously receives the transmission power control signal 10 and transmits the uplink (ground station transmission E
IRP) 4 transmission power control.

Embodiment 3 FIG. 5 shows an embodiment of the present invention. In the figure, reference numeral 1 denotes an artificial satellite for relaying communication or broadcast waves, 2 denotes a ground station communication line transmitting facility, 3 denotes a ground station communication line receiving facility, and 4 denotes an uplink line. (Earth station transmission E
IRP), 5 is a downlink (ground station reception EIRP), 6 is a radio wave propagation loss factor, 8 is a transmission power control device, 10 is a transmission power control signal, 11 is a ground station transmission power control device, and 27 is a signal from a satellite. An existing weather information system 28 which discloses weather information of each area where ground equipment for receiving radio waves is installed is weather data.

FIG. 6 shows an example of a method of processing the weather data 28 in the ground station transmission power control device 11. The numbers in FIG. 6 indicate the same or equivalent parts as in FIG.

Next, the operation according to the present invention will be described. From the existing weather information system 27 that provides detailed weather information of each area, the precipitation rate (rainfall per fixed time, snowfall per fixed time) in each area where the ground station communication line receiving facility 3 exists. Etc. are constantly input to the ground station transmission power processor 11. It is known that the intensity of radio waves is attenuated by rainfall, snowfall, clouds, and the like. The attenuation of the received power of the downlink 5 has a correlation with the precipitation rate and the like, and the attenuation of the radio wave can be estimated from this relationship.
In the ground station transmission power processing device 11, appropriate transmission is performed based on conditions such as the amount of fluctuation from the appropriate reception power value in each ground station communication line receiving facility 3 calculated from these weather data and the transmission output level range of the ground station. The power control amount is calculated and input to the transmission power control device 8 as the transmission power control signal 10 to control the power of the uplink 4. In order to calculate the correction amount of the transmission power level from the contents of a plurality of constantly changing weather data 28 and to obtain an appropriate transmission power control signal 10, the ground station transmission power processing device 11 uses, for example, as shown in FIG. Perform processing.

An example of the method is described below. In the ground station transmission power control device 11, the weather data processing unit 29 receives the weather data 28 from the existing weather information system 27 which publishes weather information of each area at appropriate time intervals, and receives the ground station communication line receiving equipment. Each weather data 30 set as a parameter for estimating the power of the downlink 5 is extracted for each region where 3 is installed. The unnecessary signal removal processing unit 12 removes unnecessary data different from its intended purpose due to noise during data communication or an abnormality of the weather information system 27 itself. Is output as weather data 31 corresponding to each terrestrial station communication line receiving equipment after removing unnecessary signals, respectively, only when it has continued for a predetermined time or more and is within a predetermined data level range. Since it is possible to estimate the amount of radio wave attenuation from weather data such as precipitation per hour, the value of the amount of precipitation is calculated based on the amount of precipitation at each ground station communication line receiving equipment 3 and the results of radio wave reception. , A correlation table 32 is created which uniquely indicates the estimated value of the reception power level (ground station reception EIRP) of the downlink 5 in each ground station communication line reception facility 3 with respect to. The correlation table 32 is set in the individual variation processing unit 14, the weather data 31 is processed, and the variation 15 from an appropriate reception level value in each ground station communication line receiving facility 3 is processed. calculate. The fluctuation amount selection processing unit 16 compares the calculated plural fluctuation amounts 15 and selects a value having a large amount of decrease (attenuation amount) from the most appropriate reception level value from among the calculated fluctuation amounts 15, and selects the fluctuation amount selection data. 17 is output.
If there is no data indicating a decrease from an appropriate reception level value in the fluctuation amount 15, a plurality of fluctuation amounts 15 are compared, and an increase value (increase amount) from the most appropriate reception level value among them is compared. Is selected and output as the variation selection data 17. The fluctuation correction amount calculation processing unit 18 converts the fluctuation amount selection data 17 into the current uplink (ground station transmission EIR).
P) 4 and add the current ground station communication line receiving equipment 3
To obtain the corrected transmission output level 19 for improving the reception situation in the above. The corrected transmission output level 19 is a transmission output level range condition predetermined by the transmission level calculation processing unit 20 from the transmission power determined by the Radio Law and the performance constraints of the ground station communication line transmission equipment 2. The transmission output upper limit 21 and the transmission output lower limit 22 are compared. The corrected transmission output level 19 is within the range of the upper limit 21 and the lower limit 22 when the corrected transmission output level 19 is within the range of the upper limit 21 and the lower limit 22 when the corrected transmission output level 19 is equal to or higher than the upper limit 21. 22
Is output to the transmission power control device 8 as the transmission power control signal 10. The transmission power control device 8 continuously receives the transmission power control signal 10 and controls the transmission power of the uplink (ground station transmission EIRP) 4.

[0021]

According to the present invention, fluctuations such as attenuation of received power in a plurality of ground station communication line receiving facilities distributed over a wide area as described above can be measured by using uplink transmission power (ground station transmission E
By finely compensating under the control of the IRP), it is possible to improve the unstable element of the satellite communication or broadcast service and to maintain the quality of communication and broadcast using artificial satellites.

[Brief description of the drawings]

FIG. 1 is a diagram showing a satellite transmission output control system according to a first embodiment of the present invention.

FIG. 2 is an example of a method for processing a reception power level signal in a ground station transmission power control device of the satellite transmission output control system according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a satellite transmission output control system according to a second embodiment of the present invention.

FIG. 4 is an example of a method of processing a rainfall intensity signal in a ground station transmission power control device of a satellite transmission output control system according to Embodiment 2 of the present invention.

FIG. 5 is a diagram showing a satellite transmission output control system according to Embodiment 3 of the present invention.

FIG. 6 is an example of a method of processing weather data in a ground station transmission power control device of a satellite transmission output control system according to Embodiment 3 of the present invention.

FIG. 7 is a diagram showing a conventional transmission power control method.

[Explanation of symbols]

1 artificial satellite, 2 ground station communication line transmission equipment, 3 ground station communication line receiving equipment, 4 uplink (ground station transmission EI
RP), 5 downlink (ground station reception EIRP), 7 reception power detection device, 8 transmission device for ground station communication line, 11
Ground station transmission power processing unit, 12 unnecessary signal removal processing unit, 14 individual fluctuation amount processing unit, 16 fluctuation amount selection processing unit, 18 fluctuation correction amount calculation processing unit, 20 transmission level calculation processing unit, 23 rainfall intensity meter, 26 correlation Table, 2
7 weather information disclosure system, 29 weather data processing unit,
32 Correlation table.

Claims (3)

[Claims] 1. A plurality of reception signals provided on the ground corresponding to a plurality of communication lines for transmitting radio waves from artificial satellites and receiving the radio waves via the communication lines to detect a reception signal level. A received signal level detecting device for detecting a level, a plurality of unnecessary signal removing means for removing unnecessary signals from the signal receiving levels respectively detected by the signal level detecting device, and a signal receiving level removed by the unnecessary signal removing device. A plurality of level variation calculating means for calculating the attenuation or increase of the received signal level by respectively comparing with a preset appropriate level, from among the plurality of level variation calculated by the level variation calculating means; Means to select the maximum or minimum variation,
The correction amount calculated by the selection means is converted into an appropriate transmission power control signal according to the reception level range condition of each of the signal level detection devices and the transmission output level range condition of the ground station transmitting radio waves to the artificial satellite. And a control device for controlling the transmission power of the ground station transmitting radio waves to the artificial satellite using the transmission power control signal. Transmission power control system. 2. A plurality of rainfall intensity meters provided on the ground corresponding to a plurality of communication lines for transmitting radio waves from artificial satellites, respectively, and the rainfall intensity detected by the rainfall intensity meters are set in advance. A plurality of level variation calculating means for calculating the attenuation or increase of the received signal level using respective correlation tables of the received signal level of the radio wave received via the communication line and the rainfall intensity, respectively, Means for selecting the maximum or minimum fluctuation amount from among the plurality of level fluctuation amounts calculated by the calculating means, and the correction amount calculated by the selecting means, for each of the received signal levels calculated using the correlation table. Control signal conversion means for converting to an appropriate transmission power control signal according to the range condition and the transmission power level range condition of the ground station transmitting the radio wave to the artificial satellite. A ground station transmission power control device with
A transmission power control system comprising: a control device that controls transmission power of a ground station that transmits radio waves to artificial satellites using the transmission power control signal. 3. A means for acquiring real-time rainfall information for each area from a plurality of ground facilities for receiving radio waves from artificial satellites and an existing weather information system that discloses weather information for each corresponding area. The reception signal level is obtained by using a correlation table between the rainfall information obtained from the weather information system and the rainfall information of the reception signal level of the radio wave received via the communication line set in advance. A plurality of level fluctuation calculating means for calculating the amount of attenuation or increase of the level, a means for selecting the maximum or minimum fluctuation from among the plurality of level fluctuations calculated by the level fluctuation calculating, and a calculation by the selecting means The obtained correction amount is calculated based on the range condition of each received signal level calculated using the above-mentioned correlation table and the location where the radio wave is transmitted to the artificial satellite. A ground station transmission power control device comprising control signal conversion means for converting the transmission power control signal into an appropriate transmission power control signal in accordance with the transmission power level range condition of the upper station; A transmission power control system, comprising: a control device that performs control using the transmission power control device.