  This paper proposes a novel geometric solution for tracking a moving target
through multistatic sensing. In contrast to existing two-step weighted least
square (2SWLS) methods which use the bistatic range (BR) and bistatic range
rate (BRR) measurements, the proposed method incorporates an additional
direction of arrival (DOA) measurement of the target obtained from a
communication receiver in an integrated sensing and communication (ISAC)
system. Unlike the existing 2SWLS methods that require at least three
transmitter-receiver (TX-RX) pairs to operate, the proposed algorithm can
conduct location estimation with a single TX-RX pair and velocity estimation
with two TX-RX pairs. Simulations reveal that the proposed method exhibits
superior performance compared to existing 2SWLS methods, particularly when
dealing with moderate levels of noise in DOA measurements.
