Distributed Passive Radar(DPR) using multiple radar systems to detect jointly, achieves an effective improvement on detection performance. Geometry optimization is one of the most important parts in distributed passive radar research. The Cramer-Rao Bound(CRB) of the joint estimation for target location and velocity in distributed passive radar is investigated, employing the Digital Television Terrestrial Multimedia Broadcasting(DTMB) signals as signals of opportunity. The CRB is used as performance metric to establish the receiver selection model, accordingly a precise receiver selection method is proposed, offering polynomial approximation strategies. The simulation results show the effectiveness of the proposed method.