Multiple truth reference system and method

A program product comprising a non-transitory processor-readable medium on which program instructions are embodied, wherein the program instructions are configured, when executed by at least one programmable processor, to cause the at least one programmable processor to:

• compare a first navigation solution received from a first navigation system with a plurality of other navigation solutions, each of the other navigation solutions received from a respective other navigation system;
• estimate one or more errors based on the comparison of the first navigation solution to the plurality of other navigation solutions;
• modify the plurality of other navigation solutions based on the estimated one or more errors;
• compare the first navigation solution to the plurality of modified other navigation solutions to generate a performance score of the first navigation system;
• and
• output the performance score to an output device.

A method of assessing performance of a test navigation system in a reference system having a plurality of reference navigation systems, the method comprising:

• receiving a respective navigation solution from each of a plurality of navigation systems, a first navigation system of the plurality of navigation systems selected as the test navigation system and the other navigation systems of the plurality of navigation systems selected as the reference navigation systems, the plurality of navigation systems comprising more than three navigation systems;
• comparing the navigation solution from the selected test navigation system with the respective navigation solution from each of the plurality of reference navigation systems to identify one or more errors in differences between the navigation solution from the selected test navigation system and the respective navigation solution from each of the plurality of reference navigation systems;
• updating the respective navigation solution from each of the plurality of reference navigation systems to adjust for corresponding errors identified by comparing the navigation solution from the selected test navigation system with the respective navigation solution from each of the plurality of reference navigation systems;
• and
• comparing the navigation solution from the selected test navigation system with the updated navigation solutions from each of the plurality of reference navigation systems to generate a performance score indicative of the performance of the test navigation system.