Abstract: For passive coherent location radar based on range-sum and direction intersection positioning, according to the measurement equations of range-sum and direction of the target, an analytical form of the two-coordinate location accuracy is derived as a function of the target location, the range-sum measurement precision, the direction measurement precision, and the site location measurement precisions of the transmitter/receiver station, via an analysis framework based on the error covariance. Using the same method, the analytical form of the three-coordinate location accuracy is thereafter also deduced by adding the measurement equation of target elevation. Based on the analytical forms of the location accuracy, the typical spatial distributions of the location accuracy are analyzed theoretically for both the two-coordinate and three-coordinate cases. In the typical application scenarios of three-coordinate passive coherent location radar, such as "air-to-ground" and "space-to-ground" configurations, the simulations are carried out with reasonable parameters. The simulation results of geometric dilution of precision coincide with the theoretical analysis, which validates the effectiveness of the proposed analysis method and the derived analytical form for target location accuracy.