1. A measurement system comprising: a first sensor configured to sense a first set of measurements from a first plurality of objects; a second sensor configured to sense a second set of measurements from a second plurality of objects; and a computer comprising: a sensor network interface configured to receive the first set of measurements and the second set of measurements; a central processing unit configured to execute computer program instructions; and a data storage storing computer program instructions defining: generating a likelihood function associating a data element from the first set of measurements with a data element from the second set of measurements; generating a systematic error function based at least in part on the likelihood function; minimizing the systematic error function; and, assigning an object from the first plurality of objects to an object from the second plurality of objects, based at least in part on the minimized systematic error function.