受験番号：30IPE004[Claim 1]
An artificial satellite characterized by comprising:a Doppler compensation circuit including
a Doppler estimation unit configured to acquire a received power levelof a received wave and a time fluctuation of the received power level, to derive aDoppler frequency of the artificial satellite based on the received power level of thereceived wave and the time fluctuation of the received power level, and to output theDoppler frequency as an estimated Doppler frequency, anda multiplication unit configured to multiply a signal of the estimatedDoppler frequency by a signal of a local frequency for demodulation, thus shifting thelocal frequency by the estimated Doppler frequency.
[Claim 2]
The artificial satellite according to claim 1, wherein
the Doppler estimation unit
acquires the received power level of the received wave and the time
fluctuation of the received power level,
uses, as a fixed parameter, a speed of light, a position of a transmitting
station, a carrier wavelength λ, a transmission equivalent isotropic radiant power, and a
receiving antenna gain Gr,
calculates the Doppler frequency of the artificial satellite based on thereceived power level of the received wave and the time fluctuation of the received
power level, andoutputs the Doppler frequency to the multiplication unit as theestimated Doppler frequency.
[Claim 3]
The artificial satellite according to claim 1, characterized in thatthe Doppler estimation unit,
acquires the received power level of the received wave and the time
fluctuation of the received power level,refers to reference information including candidates for the estimatedDoppler frequency prepared in advance in association with the received power level,
calculates the candidates for the estimated Doppler frequency based on
the acquired received power level of the received wave,
selects the estimated Doppler frequency from the candidates based on
the time fluctuation of the received power level, andoutputs the estimated Doppler frequency to the multiplication unit.
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--------------------------------------------------------------------------------------------------------In recent years, a fuel cell device has been proposed as next-generation energy,
the fuel cell device including a fuel cell unit that can obtain power using a fuel gas(hydrogen-containing gas) and an oxygen-containing gas (air).
A power conditioner is used in a power generation system in order for a fuelcell device that is a distributed power source to supply power to a load in coordination
with a system power source. The power conditioner has various functions such as aninverter function for converting a direct current output from the fuel cell device into analternating current and a control function for performing interconnection control with asystem power source.
The power conditioner supplies the power generated by the fuel cell device toan external load in coordination with the system power source. At this time, the output
power is increased or decreased so as not to generate a reverse power flow to the system,and thus power satisfying the power requirements of the external load is output. Whenthe output power from the power conditioner to the external load is increased, the output
current from the fuel cell device to the power conditioner is decreased. When the fuelcell device detects a decrease in the output current, the fuel cell device attempts toincrease amounts of oxygen gas and fuel gas supplied to the fuel cell unit by controllingthe operation of an auxiliary device in order to increase an amount of power generation.
However, it is difficult to instantaneously increase the amounts of oxygen gas and fuelgas, and in the fuel cell device, a state in which oxygen gas and fuel gas for power
generation are insufficient occurs. Power generation in a state where the oxygen gas
and the fuel gas are insufficient causes damage to the fuel cell unit, resulting in
problems that the fuel cell device may be easily damaged and the service life may beshort.
--------------------------------------------------------------------------------------------------------The business operation image process view BV, which will be described laterin detail, illustrates an overview of business operations to be systematized abstracted by"events", "cores" and figures showing their relationships, and shows the entire business
operations of a company in a macro manner and in a form that can be understood bymultiple persons. The pre-processing engine 100 has a role of clearly identifying thebusiness operation and an operation target during a core business operation, anddescribing the identified business operation and operation target in the form of abusiness operation image process view when a core business operation application isconstructed.
The SVO list E1 is a list that displays operations that the roles on a scenario
chart perform on the operation target. The SVO list E1 a list with the same granularity
as that of the roles on the scenario chart D4, in other words, a list that expands, as agranularity, the "function" when the role on the scenario chart D4 is systematized.
Further, the activity definition E2 is a definition related to a process (step) forcompleting the role on the scenario chart D4.