For the tracking problem of moving targets by small-scale platforms, this paper firstly proposed a ship target tracking model with joint electromagnetic signals based on point charge theory and point magnetic charge theory. Then, the target tracking was simulated and verified with the progressive update extended Kalman filter algorithm as the filtering unit and the small-scale platform as the sensor-carrying platform. Finally, the laboratory model validation was carried out, and the simulated source experiment and ship model experiment were conducted, respectively. The simulation results show that the tracking method with the joint electromagnetic signal can achieve a tracking error less than 5 m in the range of 6 times the ship length. The results of the model experiments further verify the simulation results. When the signal-to-noise ratio is only 5, it can also achieve at least 2 times the ship's length of tracking, which can effectively solve the problem of poor tracking caused by the small size of the sensor carrying platform and the small number of sensors.