INTERFERENCE REJECTIONS OF SATELLITE GROUND TERMINAL WITH ORTHOGONAL BEAMS
First Claim
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1. A satellite ground terminal comprising:
- an antenna comprising multiple feeds, wherein said feeds are each configured to collect satellite signals in Ka band from multiple different orbital satellites so as to output Ka-band signals in an analog format, wherein said different orbital satellites comprise first and second satellites;
an analogue beamforming network arranged downstream of said antenna, wherein said analogue beamforming network is configured to form multiple concurrent orthogonal beams at the same frequency in a frequency band based on said Ka-band signals, wherein said concurrent orthogonal beams comprises first and second orthogonal beams, wherein said first orthogonal beam comprises a first beam peak in a direction of said first satellite and a first null substantially in a direction of said second satellite, wherein said second orthogonal beam comprises a second beam peak in said direction of said second satellite and a second null substantially in said direction of said first satellite; and
a front end processor arranged downstream of said analogue beamforming network.
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Abstract
An outdoor unit of a satellite ground terminal is capable of simultaneously receiving satellite signals or data streams originated from multiple different orbital satellites operating at the same frequency in a satellite communication frequency band such as Ka band or Ku band by multiple concurrent orthogonal beams, which are generated by multiple analogue or digital beam forming networks of the outdoor unit and an antenna, such as multiple-beam antenna or direct radiating/reception array, of the outdoor unit. Each of the orthogonal beams has a beam peak in the desired direction and multiple nulls in the interference directions.
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Citations
20 Claims
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1. A satellite ground terminal comprising:
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an antenna comprising multiple feeds, wherein said feeds are each configured to collect satellite signals in Ka band from multiple different orbital satellites so as to output Ka-band signals in an analog format, wherein said different orbital satellites comprise first and second satellites; an analogue beamforming network arranged downstream of said antenna, wherein said analogue beamforming network is configured to form multiple concurrent orthogonal beams at the same frequency in a frequency band based on said Ka-band signals, wherein said concurrent orthogonal beams comprises first and second orthogonal beams, wherein said first orthogonal beam comprises a first beam peak in a direction of said first satellite and a first null substantially in a direction of said second satellite, wherein said second orthogonal beam comprises a second beam peak in said direction of said second satellite and a second null substantially in said direction of said first satellite; and a front end processor arranged downstream of said analogue beamforming network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An outdoor unit of a satellite ground terminal comprising:
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an antenna comprising multiple feeds, wherein said feeds are each configured to collect satellite signals in Ka band from multiple different orbital satellites so as to output Ka-band signals in an analog format, wherein said different orbital satellites comprise first and second satellites; and an analogue beamforming network arranged downstream of said antenna, wherein said analogue beamforming network comprises a power dividing network arranged downstream of said feeds, wherein said power dividing network is configured to divide said Ka-band signals into first and second sets of power-divided signals, a first hybrid network arranged downstream of said power dividing network, wherein said first hybrid network is configured to receive said first set of power-divided signals and form a first beam based on said first set of power-divided signals, wherein said first beam comprises a first beam peak in a direction of said first satellite and a first null substantially in a direction of said second satellite, and a second hybrid network arranged downstream of said power dividing network, wherein said second hybrid network is configured to receive said second set of power-divided signals and form a second beam simultaneously with said first beam based on said second set of power-divided signals, wherein said second beam comprises a second beam peak in said direction of said second satellite and a second null substantially in said direction of said first satellite. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification