Hughes Network Systems, LLC

Hughes Electronics Corporation

Litton Systems, Inc.

Jacob Rozmaryn

Matthew Baer

Javier Alveiro Monroy

Stanley J Gourse

Dennis L Kershner

Matthew Benjamin Baer

Systems and methods are provided for satellite noise and interference calibration using satellite terminal measurements. In one implementation, a method includes partitioning a satellite network into a first partition including a plurality of terminals and a plurality of inroute frequency channels (IFCs); instructing the plurality of terminals of the partition to measure the SINR of the plurality of IFCs; processing the plurality of SINR measurements to compute normalized IFC measurements for each of the plurality of terminals; processing the normalized IFC measurements for each terminal to compute final calibrated IFC SINR offsets for each IFC of the partition; and normalizing the final calibrated IFC SINR offsets with respect to a lowest SINR offset IFC. The normalized final calibration offsets may be made available to each of the satellite terminals. During subsequent operation, the satellite terminals may consider the amount of interference present in an IFC before switching to the channel.

Systems and methods for satellite noise and interference calibration using terminal measurements

The residual phase deviation of the supervisory audio tone (SAT) and/or signaling tone (ST) signal in an analog voice channel cellular communication system is used to estimate the underlying signal-to-noise ratio (SNR) and signal-to-interference ratio (SIR). The phase deviation is estimated using a two-stage autoregressive filter/variance estimator, which may be implemented in firmware in a digital signal processor.

Signal to noise and interface estimator for analog voice channel

A process and means for identifying erroneous frequency measurements made by an IFM receiver using a multi-channel delay line discriminator. Expected phase codes are compared with measured phase codes. An error signal is generated when the magnitude of deviation exceeds a predetermined amount. Preferred formulas are used to compute the expected phase codes and the deviation magnitude.

Digital error detector for IFM receiver

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Silver Spring, MD, United States of America

Jacob Rozmaryn