Low noise front-end blanking and interleaving for satellite reception in pulsed interference environments
First Claim
1. An apparatus to enable high-quality digital transmissions to a satellite terminal operating in proximity to a radar source, comprising:
- interleaving means for interleaving a sequence of channel symbols at a land station before transmission of an encoded signal reflecting said sequence of channel symbols to a satellite;
means for increasing said satellite'"'"'s effective isotropic radiated power to compensate for the effects of a radar duty factor on received power and code distance;
radar detecting means at said satellite terminal to detect a radar pulse;
blanking means at said satellite terminal to prevent reception of said encoded signal by a modem at said satellite terminal during said radar pulse, thus creating a gap in said sequence of channel symbols, said modem having a forward error correction metric capable of recognizing and eliminating the effect of said gap on its metric calculation; and
de-interleaving means at said satellite terminal for de-interleaving said sequence of channel symbols.
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Accused Products
Abstract
A method and apparatus to enable high-quality digital transmissions to a satellite terminal operating in proximity to a radar source combines interleaving a sequence of channel symbols at a land station before transmission of an RF signal to a satellite, increasing the satellite'"'"'s EIRP to compensate for the effects of the radar'"'"'s duty factor on received signal power and code distance, detecting the radar pulses at a satellite terminal, blanking the received RF signal to prevent reception of the signal by the modem at the satellite terminal during the radar'"'"'s ON time, having the modem recognize and eliminate the effect of the gap in the channel signals on its metric calculation, and de-interleaving the sequence of channel symbols. As a result, satellite terminals operating in proximity to radar sources can provide the same quality of service as if there were no radars operating.
82 Citations
12 Claims
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1. An apparatus to enable high-quality digital transmissions to a satellite terminal operating in proximity to a radar source, comprising:
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interleaving means for interleaving a sequence of channel symbols at a land station before transmission of an encoded signal reflecting said sequence of channel symbols to a satellite; means for increasing said satellite'"'"'s effective isotropic radiated power to compensate for the effects of a radar duty factor on received power and code distance; radar detecting means at said satellite terminal to detect a radar pulse; blanking means at said satellite terminal to prevent reception of said encoded signal by a modem at said satellite terminal during said radar pulse, thus creating a gap in said sequence of channel symbols, said modem having a forward error correction metric capable of recognizing and eliminating the effect of said gap on its metric calculation; and de-interleaving means at said satellite terminal for de-interleaving said sequence of channel symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method to enable high-quality digital transmissions to a satellite terminal operating in proximity to a radar source, comprising the steps of:
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interleaving a sequence of channel symbols at a land station before transmission of an encoded signal reflecting said sequence of channel symbols to a satellite; increasing said satellite'"'"'s EIRP to compensate for the effects of a radar duty factor on received power and code distance; detecting a radar pulse at said satellite terminal; blanking said encoded signal at said satellite terminal to prevent reception of said encoded signal by a modem at said satellite terminal during said radar pulse, thus creating a gap in said sequence of channel symbols, said modem having a forward error correction metric capable of recognizing and eliminating the effect of said gap on its metric calculation; and de-interleaving said sequence of channel symbols at said satellite terminal.
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Specification