tdoa principle of positioning means to derive the difference in the distance between the target point and the two known points by measuring the arrival time difference between the two different known point and the target point.
TDOA positioning principle by means of measuring two different known point and the point to be detected between the time difference of arrival, so that the measured point and the distance between two known points difference.
TDOA location principle means measurement of two different known point and time difference of arrival between test points, to arrive at the test point and the distance between two known points difference.