Correcting satellite pointing direction

A system comprising:

• a plurality of signal measurement circuits, each of the measurement circuits programmed to receive a transmission signal from a transmitter in a satellite and measure at least one characteristic of the transmission signal;
• and
• a computer programmed to:
• receive, from each of the plurality of signal measurement circuits, data indicating one or more characteristics of the transmission signal as received by the measurement circuit, the one or more characteristics of the transmission signal including a strength of the transmission signal;
• determine an initial estimated satellite pointing direction;
• generate one or more subsequent estimated satellite pointing directions;
• compare, for the initial estimated satellite pointing direction and each subsequent estimated satellite pointing direction, the strength of the transmission signal received by each measurement circuit with an expected strength of the transmission signal based on the respective estimated pointing direction, wherein the computer is further programmed to determine each subsequent estimated pointing direction based at least in part on the comparison of the immediately preceding estimated pointing direction;
• and
• estimate, based on the comparisons, a current satellite pointing direction.