JPH03232323A - On-satellite radio power equipment - Google Patents

Abstract

PURPOSE:To keep the output power of a radio power equipment mounting on an artificial satellite to an irreducible minimum and to extremely miniaturize this equipment in comparison with the conventional equipment by respectively changing the equivalent isotropic radiation power(EIRP) of radio waves at every area by corresponding to rainfall condition at every area. CONSTITUTION:The radio wave received by a reception antenna 1 passes through a frequency converter 2 of a receiver, is subjected to hexapartition by a distributor 3 and guided to six variable gain amplifiers (8-1)-(8-6). Each variable gain amplifier 8 is composed of a variable attenuator 9 and an amplifier 10 whose gain is fixed, and according to gain information composed of a reception level, etc., corresponding to the rainfall condition at every area, the attenuation amount of the variable attenuator 9 is changed. Corresponding to such a change in the amplified gain, the EIRP of the radio waves to the radiated from a transmission antenna 5 to the respective areas is respectively changed. The gain information is respectively transmitted to the amplifiers (8-1)-(8-6) separately from a signal to be repeated, and by using this information, the power supply voltage, etc., of each amplifier 8 is controlled so a to executed the optimum amplifying operation corresponding to respective inputs.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a satellite-mounted wireless power device that is mounted on an artificial satellite such as a broadcasting satellite or a communication satellite and radiates radio waves to multiple areas on the ground. This system is designed to efficiently radiate wireless power according to the rainfall conditions on the ground.

(Summary of the invention) The service area of a broadcasting/communications satellite is divided into multiple areas, and the equivalent isotropic radiated power (EIRP), which is the product of the output of the onboard wireless power amplifier and the transmitting antenna gain, is calculated for each service area. In response to increased propagation loss due to rain, the power amplifier output for each region can be changed by switching to a backup high-output amplifier or increasing the variable gain. As a result, it becomes possible to downsize the on-board wireless power device.

(Prior art) In conventional artificial satellites of the type 1:, a uniform margin is applied to E[RP for each service area in order to compensate for a drop in reception power due to rainfall in the reception area of the radio transmission signal towards the earth. I was designing the on-board wireless power device, including
This is an extremely large power device considering the amount of power required when the entire area is sunny. When setting the margin, the idea was to set a different value for each region depending on the amount of rainfall that varies in each region, but the margin setting value is fixed. , it was not designed to change according to the rainfall situation from moment to moment, so in the end, we had no choice but to set a large margin that could compensate for the maximum decrease in received power in each region. Large wireless power value! There was no significant change in the need for installation.

(Problem to be Solved by the Invention) In other words, in the conventional margin-law setting, since the attenuation due to rain is particularly significant for radio waves in the high frequency range, an extremely large margin is required. The onboard wireless power device has become extremely large. For example, 2
For radio waves in the 2 GHz band, rain attenuation of approximately 9 dB occurs at a rate of 1% in the worst month of the year, but even with this rain attenuation, received signal quality comparable to that on sunny days is ensured. Approximately 8 times the power output under clear weather conditions, or 9 dB, is required for this purpose. Therefore, the satellite-mounted wireless power device must be capable of generating about eight times the power required on a clear day, making it extremely large and potentially making it impossible to mount it on the satellite itself.

Moreover, when such a high-power device is installed, non-VI power, which is about 8 times the required power, will be constantly sent out even on sunny days, which not only wastes power consumption but also reduces the power consumption of other terrestrial communications and broadcasting devices. There was also the possibility of interfering with Nostem.

(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned conventional problems, and to achieve received signal quality comparable to that in clear weather even when attenuated by rain, by transmitting wireless power to the minimum necessary level. An object of the present invention is to provide a satellite-mounted wireless power device that can be secured.

That is, the present invention focuses on the fact that the probability of rain occurring simultaneously across the entire service area is extremely small, and divides the service area into multiple regions and increases the EIFIP moment by moment only for the areas where rainfall occurs. This prevents the total transmittable power from becoming excessive, downsizes the satellite-mounted wireless power device, and makes it possible to radiate appropriate wireless power for each region.

That is, the satellite-mounted wireless power device of the present invention is a satellite-mounted wireless power device that is equipped with a plurality of wireless power amplifiers that radiate radio waves for each region to a plurality of receiving regions. The feature is that the isotropically radiated power is varied depending on the rainfall situation in each region.

(Function) Therefore, in the satellite-mounted wireless power device of the present invention,
By using a wireless power device with a scale that does not significantly exceed the scale required when the entire service area is sunny, it is possible to ensure received signal quality that is comparable to that during clear weather, despite rain attenuation in each region.

(Example) The present invention will be described in detail below with reference to the drawings.

First, FIG. 1 shows an example in which the service area of a broadcasting satellite, which is a preferred example to which the present invention is applied, is divided into six regions.

In the illustrated example, the Japanese archipelago is divided into six regions: Hokkaido, Tohoku, Kanto, Kansai, Chugoku/Shikoku, and Bonyo, and a wireless power device mounted on a broadcasting satellite is configured to emit radio wave beams to each region. It is assumed that it consists of Note that such multiple radio wave beams can be a multi-beam system that broadcasts separate programs for each region, or the beams for each region can be combined into a single beam and the same program can be broadcast to each region. It is also possible to use a shaped beam method.

In the satellite-mounted wireless power device of the present invention, among the plurality of beams, only the beam toward the rainy area is subjected to EIRP.
is increased to compensate for the drop in received power due to rain. Therefore, in order to distinguish between rainy areas and sunny areas in multiple reception areas, the reception level of the radiated radio waves from the satellite towards the ground must be monitored in each area, and the areas where the reception level has decreased are identified as rainy areas. There is a way to determine this. This is an example of the Kyushu region shaded in FIG. 1 or its rainy region, and in the illustrated example, only the Kyushu region increases EIl'lP to compensate for a decrease in reception level due to rain.

Next, FIG. 2 shows a configuration example in which the present invention is applied to a repeater which is a preferred example of a satellite-mounted wireless power device, so that E[lP of radiated radio waves for multiple regions can be individually controlled. In the illustrated configuration example, for example, radio waves from a terrestrial broadcasting station are received by a receiving antenna 1, guided to a distributor 3 via a frequency converter 2 of a receiver, and the required ETRP for clear weather is transmitted. In addition to distributing it to low-power amplifiers 6-1 to 6-6 provided in each of a plurality of reception areas, at least one high-power amplifier 7 is also equipped with a Then, as shown in the figure, the outputs of the plurality of amplifiers are distributed via an on-off switch, and the outputs of the plurality of amplifiers are transmitted via a switch 4 to a transmitting antenna 5 configured as a multi-horn, for example, so as to be radiated to each receiving area.
Among the plurality of low output amplifiers 6-1 to 6-6, the low output amplifier 6 whose EIRP needs to be increased due to rainfall in the receiving area is switched to the high output amplifier 7 to increase the EIRP. The switching of the amplifiers is controlled, for example, according to the result of the above-mentioned terrestrial reception level determination, and when a rainy area occurs, the high output amplifier 7 is activated and switched to the low output amplifier 6 corresponding to the rainy area. , the switched low power amplifier 6 stops operating.

Further, the multi-horns of the transmitting antenna 5 are configured to correspond to respective receiving areas.

Next, according to the present invention, for multiple regions, E[
Another configuration example of a satellite-mounted repeater in which the RP can be individually controlled by using a substantially variable gain amplifier is shown in Fig. 3.
In the illustrated configuration example, a radio wave received by a receiving antenna 1 is divided into six parts by a distributor 3 via a frequency converter 2 of the receiver, and is guided to six variable gain amplifiers 8=1 to 8-6. Each of these variable gain amplifiers 8 has a variable attenuator 9.
and a fixed gain amplifier 10, and the amount of attenuation of the variable attenuator 9 changes in accordance with gain information consisting of, for example, the reception level corresponding to the rainfall situation of each region as described above, and such amplification gain changes. The EIRP of the radio waves radiated from the transmitting antenna 5 to each region changes accordingly. Note that the gain information is transmitted to the amplifiers 8-1 to 8-6 separately from the signal to be relayed, and each amplifier 8 uses this gain information to perform the optimal amplification operation according to its input. The power supply voltage etc. are adjusted accordingly. With such an adjustment function, even when a traveling wave tube is used for the amplifier 10, for example, it is possible to prevent the power efficiency from decreasing as much as possible.

(Effects of the Invention) As is clear from the above description, according to the present invention, a wireless power device mounted on an artificial satellite can be made to have the minimum necessary output, and can be significantly miniaturized compared to the conventional method. .

For example, in a broadcasting satellite that emits 4 channels of radio waves, the service area is divided into 6 areas, and each receiving area is set to have a transmitting power of 25 W on sunny days, which compensates for a 1 dB drop in received power during rainy weather. Assuming that, in the conventional fixed ETRP configuration, the total transmission power is 2.
5W x 4 (channel) x 6 (region) x 8 (9aB
) = 4,800W. For example, the power generated by a non-VAT device mounted on a broadcasting satellite is usually about three times the transmission power, so in the above case, the power generated is approximately 15,000
This generates OW power, and it is difficult to realize a wireless power device that can generate such a large amount of power using conventional satellite manufacturing technology.

On the other hand, by applying the present invention, for example, as in the above-mentioned example, only the Kyushu region has 9 d of rain due to rainfall.
If we compensate for the decrease in reception power for B, but do not compensate for the transmission power for other reception areas, the total transmission power will be 1,300W, and the required power generated by the broadcasting satellite will be approximately 4 ,000 W is sufficient, which is significantly reduced compared to the conventional approximately 15,000 W, making the wireless power device significantly smaller, and a satellite-mounted wireless power device of this scale can be realized using conventional manufacturing technology. It is.

Therefore, according to the present invention, there is no need to wastefully transmit extra wireless power to areas where there is no rainfall in consecutive losing reception areas as in the past, and interference with terrestrial communication and broadcasting systems is significantly reduced. A remarkable effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of multiple divisions of satellite broadcasting service areas targeted for implementation of the present invention, FIG. 2 is a block diagram showing an example of the configuration of the satellite-mounted wireless power device of the present invention, and FIG. 3 is a diagram showing an example of the configuration of the satellite-mounted wireless power device of the present invention. FIG. 3 is a block diagram illustrating another configuration example of the satellite-mounted wireless power device. 1...Receiving antenna 2...Frequency converter 3...Distributor 4...Switcher 5...Receiving antenna 6-1 to 6-6...Low output amplifier 7...High output Amplifiers 8-1 to 8-6...Variable gain amplifier 9...Variable attenuator 10...Amplifier

Claims (1)

[Claims] 1. In a satellite-mounted wireless power device equipped with a plurality of wireless power amplifiers that radiate radio waves for each region to a plurality of reception regions, equivalent isotropic radiation of radio waves for each region is provided. A satellite-mounted wireless power device characterized by varying power depending on the rainfall situation in each region. 2. The equivalent isotropic radiated power of the plurality of wireless power amplifiers corresponds to a clear sky, and at least one high-output wireless power amplifier with an equivalent isotropic radiated power exceeding the value corresponding to a clear sky is provided, and 2. The satellite-mounted wireless power device according to claim 1, wherein the wireless power amplifier corresponding to the region is switched to the high-output wireless power amplifier depending on the rainfall situation. 3. The equivalent isotropic radiated power of the plurality of wireless power amplifiers is adjustable, and the equivalent isotropic radiated power of the corresponding wireless power amplifier is changed according to the rainfall situation in each region. A satellite-mounted wireless power device according to claim 1.