GPS-based roll rate and roll angle measurement in the absence of jamming

A system for determining the roll rate and roll angle of a spinning platform comprising:

• a plurality of antennas for receiving GPS signals from at least one satellite, each antenna outputting an antenna signal for each received signal;
• a GPS receiver processor for forming the navigation solution;
• and a
• roll processor, for correlating each of the antenna signals separately, measuring the amplitude and phase differences between the correlated signals from pairs of antennas, and processing the measured amplitude and phase differences and navigation solution in a roll filter that outputs roll information, said roll filter including roll angle as a filter state variable.

A method for determining the roll rate and roll angle of a spinning platform comprising the steps of

• receiving GPS signals on a plurality of antennas from at least one satellite and outputting an antenna signal for each received signal;
• forming the navigation solution;
• correlating each of the antenna signals separately;
• measuring amplitude differences between the correlated signals from pairs of antennas;
• and
• processing the measured amplitude differences and navigation solution in a roll filter that outputs roll information, said roll filter including roll angle as a filter state variable.

A method for determining the roll rate and roll angle of a spinning platform comprising the steps of

• receiving GPS signals on a plurality of antennas from at least one satellite and outputting an antenna signal for each received signal;
• forming the navigation solution;
• correlating each of the antenna signals separately;
• measuring amplitude and phase differences between the correlated signals from pairs of antennas;
• and
• processing the measured amplitude and phase differences and navigation solution in a roll filter that outputs roll information, said roll filter including roll angle as a filter state variable.