Radio frequency interference monitor
First Claim
1. A method of monitoring radio frequency interference (RFI) in a satellite signal, wherein the satellite signal includes a carrier signal, the method comprising:
- calculating a statistical variance estimate (V) based on a plurality (K) of discriminator values (dk) formed in a carrier tracking loop; and
calculating an RFI detector from the statistical variance estimate.
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Accused Products
Abstract
A method for monitoring radio frequency interference (RFI) in a pass band of a satellite signal is provided. The satellite signal includes a carrier signal tracked by a carrier tracking loop located at a receiver. The method involves calculating a statistical variance estimate based on a plurality of discriminator values formed in the carrier tracking loop and calculating an RFI detector from the statistical variance estimate. The method is particularly useful for detecting continuous wave (CW) and narrowband RF interfering signals in the tracking loop pass band.
44 Citations
44 Claims
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1. A method of monitoring radio frequency interference (RFI) in a satellite signal, wherein the satellite signal includes a carrier signal, the method comprising:
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calculating a statistical variance estimate (V) based on a plurality (K) of discriminator values (dk) formed in a carrier tracking loop; and
calculating an RFI detector from the statistical variance estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of monitoring narrowband and continuous wave RF interference in a system comprising a plurality of satellites transmitting a respective plurality of satellite signals, at least one reference receiver and a ground station, wherein the at least one reference receiver receives the satellite signals from the plurality of satellites, the method comprising:
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forming, for each satellite signal, a plurality of discriminator values (dk) based on processing, in a carrier tracking loop included within one of the at least one of reference receivers, a carrier signal associated with the satellite signal;
calculating a statistical variance estimate (V) for each satellite signal based on the plurality (K) of discriminator values (dk); and
calculating an RFI detector from the statistical variance estimate. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method for monitoring continuous wave and narrowband interference in a pass band of a satellite carrier signal, the method comprising in combination:
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means for estimating a statistical variance among a plurality of discriminator values formed in a tracking loop, wherein the tracking loop tracks the satellite carrier signal;
means for calculating a standard deviation value from the statistical variance estimate;
means for comparing the standard deviation value to a threshold value; and
means for detecting an RFI fault when the standard deviation value exceeds the threshold value.
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Specification