Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1990-11-16
1992-06-02
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342354, G01S 502, H04B 785
Patent
active
051191032
ABSTRACT:
A method for steering the gain of a multiple antenna Global Positioning System (GPS) receiver toward a plurality of a GPS satellites simultaneously is provided. The GPS signals of a known wavelength are processed digitally for a particular instant in time. A range difference or propagation delay between each antenna for GPS signals received from each satellite is first resolved. The range difference consists of a fractional wavelength difference and an integer wavelength difference. The fractional wavelength difference is determined by each antenna's tracking loop. The integer wavelength difference is based upon the known wavelength and separation between each antenna with respect to each satellite position. The range difference is then used to digitally delay the GPS signals at each antenna with respect to a reference antenna. The signal at the reference antenna is then summed with the digitally delayed signals to generate a composite antenna gain. The method searches for the correct number of integer wavelengths to maximize the composite gain. The range differences are also used to determine the attitude of the array.
REFERENCES:
patent: 4797677 (1989-01-01), MacDoran et al.
patent: 4996532 (1991-02-01), Kirimoto et al.
Isley et al., "ATS-6 Interferometer", IEEE Trans. on Aerospace and Elec. tems, vol. AES-11, No. 6, pp. 1165-1169, Nov. 1975.
Spilker et al., "The Delay Lock Discriminator--An Optimum Tracking Device", Proc of the IRE, pp. 1403-1406, Sep. 1961.
Evans Alan G.
Hermann Bruce R.
Issing Gregory C.
Lewis John D.
The United States of America as represented by the Secretary of
Walden Kenneth E.
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