Satellite receiver and satellite communication system

A satellite communication system, comprising:

• a satellite receiver;
• a switch;
• and
• a satellite transmitter,
• the satellite receiver including:
• N reception antenna elements;
• N demultiplexers configured to demultiplex reception signals from the N reception antenna elements into sub-channels;
• correlation circuitry configured to perform correlation processing on each of the reception signals demultiplexed by the N demultiplexers with a reception antenna element that receives the highest power being set as a reference element so as to calculate a relative phase difference, and calculate an excitation coefficient for cancelling a phase difference between the N reception antenna elements for each of the sub-channels based on the calculated relative phase difference;
• N phase compensators configured to multiply the reception signals demultiplexed by the N demultiplexers, respectively, by the excitation coefficient for each of the sub-channels;
• and
• a combiner configured to combine multiplication results from the N phase compensators for each of the sub-channels to generate output signals corresponding to the N reception antenna elements,
• the switch being configured to exchange the output signals generated by the combiner for each of the sub-channels in a frequency domain, to output transmission signals,
• the satellite transmitter including:
• a memory to store therein a transmission excitation coefficient associated with a transmission direction of a corresponding transmission beam;
• N phase shifters configured to read from the memory the transmission excitation coefficient in accordance with the transmission direction of a corresponding transmission beam, and multiply a corresponding transmission signal output from the switch by the read transmission excitation coefficient;
• N multiplexers configured to multiplex multiplication results from the N phase shifters on a frequency axis;
• and
• N transmission antennas configured to emit signals multiplexed by the N multiplexers to a space so as to generate transmission beams,
• wherein N is an integer of two or more.

A satellite receiver, comprising:

• N reception antenna elements;
• N demultiplexers configured to demultiplex reception signals from the N reception antenna elements into sub-channels;
• correlation circuitry configured to perform correlation processing on each of the reception signals demultiplexed by the N demultiplexers with a reception antenna element, of the N reception antenna elements, that receives a highest power being set as a reference element so as to calculate a relative phase difference, and calculate an excitation coefficient for cancelling a phase difference between the N reception antenna elements for each of the sub-channels based on the calculated relative phase difference;
• N phase compensators configured to multiply the reception signals demultiplexed by the N demultiplexers, respectively, by the excitation coefficient for each of the sub-channels;
• and
• a combiner configured to combine multiplication results from the N phase compensators for each of the sub-channels to generate output signals,
• wherein N is an integer of two or more, and
• wherein the correlation circuitry is further configured to determine a correlation between spectrum-resolved signals having a frequency that is limited, based on receiving, from a ground command acquisition antenna, notification information, transmitted from a ground control station, for limiting the frequency to be subjected to the correlation process.