Multiple frequency antenna structures and methods for receiving navigation or ranging signals
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United States of America Patent
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Jan 1, 2008
Grant Date -
Dec 13, 2007
app pub date -
Jul 30, 2004
filing date -
Jul 30, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
In a local positioning system, augmentation of the land-based system is provided by receiving signals from a GNSS. The signals from the land-based positioning system have a code phase accuracy better than one wavelength of a carrier of the signals from the GNSS. Different decorrelation may be used for signals from a satellite than from a land-based transmitter, such as using a digital decorrelator for signals from the satellite and an analog decorrelator for signals from a land-based transmitter. The receivers may include both a GNSS antenna and a local antenna. The phase centers of the two antennas are within one wavelength of the GNSS signals from each other. The local antenna is sized for operation in the X or ISM-bands of frequencies. The GNSS antenna is a patch antenna where the microwave antenna extends away from the patch antenna in at least one dimension.
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