Method of Steering the Gain of a Multiple Antenna Global Positioning System Receiver
Patent, Filed 16 Nov 90, patented 2 Jun 92,
COURTNEY AND CO PHILADELPHIA PA
Pagination or Media Count:
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 antennas 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.
- Navigation and Guidance
- Unmanned Spacecraft