1. A method of estimating a crossing location of an object, said method comprising the steps of: sensing the presence of an object in a field of view; tracking the object with first and second sensors; measuring range to the object with the first sensor; measuring range to the object with the second sensor, wherein the first and second sensors are separate from each other; determining a first range rate of the object with the first sensor, and determining a second range rate of the object with the second sensor; computing a mathematical square of range and a mathematical square of the product of range and range rate for each of the plurality of measurements taken with the first sensor and generating a first curve as a function thereof; computing a mathematical square of range and a mathematical square of the product of range and range rate for each of the plurality of measurements taken by the second sensor and generating a second curve as a function thereof; and estimating the crossing location of the object as a function of the first and second curves.