Method and system for demodulation of open-loop gps radio occultation signals

A method of processing a radio signal that contains information related to atmospheric conditions, said method comprising:

• receiving a radio signal that has experienced a first occultation;
• recording said received radio signal that has experienced said first occultation;
• and
• transmitting said recorded radio signal that has experienced said first occultation for combination with a recording of at least a portion of said radio signal that has not experienced said first occultation.

A satellite operable to process a radio signal that has undergone a first occultation, said satellite comprising:

• a receiver operable to receive a radio signal that has experienced a first occultation;
• a recording module operable to record said received radio signal that has experienced said first occultation;
• and
• a transmitter operable to transmit said recorded radio signal that has experienced said first occultation, wherein said transmitted signal is operable to be combined with a recording of at least a portion of said radio signal that has not experienced said first occultation.

A method of processing a radio signal that contains information related to atmospheric conditions, said method comprising:

• a. obtaining a radio signal, wherein said radio signal was received at a first receiver, wherein said radio signal was transmitted from a GPS satellite during a time period, wherein said radio signal underwent occultation during said transmission from said GPS satellite to said first receiver during said time period, wherein said radio signal includes a radio occultation signal and the GPS NDM;
• b. obtaining the GPS NDM transmitted from said GPS satellite during said time period from a source other than said first receiver;
• and
• c. determining said first radio occultation signal from said radio signal obtained in step a and from said GPS NDM obtained in step b.

An occultation signal processing system operable to extract a radio occultation signal from an occulted GPS radio signal, said system comprising:

• a processor;
• and
• a computer usable medium having computer program code embodied therein, the computer program code including:
• a. computer readable program code enabling said processor to read a data file including a GPS radio signal that has experienced occultation;
• b. computer readable program code enabling said processor to read a data file including the NDM of said GPS radio signal;
• and
• c. computer readable program code enabling said processor to determine a radio occultation signal from said GPS radio signal that has experienced occultation and said NDM of said GPS radio signal.