Determination of a ground receiver position

A ground receiver operable to determine a geographical location of the ground receiver, the ground receiver having computer circuitry configured to:

• receive a plurality of radio frequency (RF) signals from a plurality of RF signal carriers at the ground receiver, wherein the plurality of RF signal carriers include at least one non-dedicated satellite, wherein the at least one non-dedicated satellite is a non-global positioning system (non-GPS) satellite;
• measure a Doppler shift associated with each of the plurality of RF signals at the ground receiver, wherein the computer circuitry is further configured to:
• measure frequencies for each of a plurality of non-spread spectrum RF signals;
• compare the frequencies to known frequencies associated with the plurality of non-spread spectrum RF signals;
• calculate a difference between the frequencies that are measured and the known frequencies in order to calculate the Doppler shift for each of the non-spread spectrum RF signals;
• and
• determine the geographical location of the ground receiver in X, Y and Z coordinates based in part on the Doppler shift associated with each of the plurality of RF signals.