Aerial target positioning method based on distributed node hybrid measurement

In actual detection scenarios, receiving stations are a very valuable sensing resource. Given the number of receiving stations, it is desired to achieve the highest possible positioning accuracy. To this end, we conducted research on a three-node hybrid target localization method using a combination of multiple measurement methods. Firstly, by using the spatial geometric relationship between the distributed node network configuration and the target, the measurement models of the target receiving cone angle DOA, time difference of arrival TDOA, and frequency difference of arrival FDOA were established. Secondly, the LS problem about the reference distance and target X-coordinate estimation is established by using DOA measurement and TDOA measurement, and then FDOA measurement is used to assist in improving the accuracy of parameter estimation; Finally, TDOA measurement is used to construct a pseudo-linear equation group to estimate the Y and Z coordinates of the target, and the WLS method is used to locate the target. This method effectively utilizes mixed measurement information and reduces the number of required DOA measurements. Target positioning can be completed with only three receiving stations, which reduces system costs and has broad application prospects.