Simultaneous measurement of radial and transversal velocities using a dual-frequency interferometric radar

The linear velocity of an arbitrary moving object comprises two orthogonal components with reference to the observing radar, those are radial velocity and transversal velocity. The interferometric radar is capable of providing the complete 2-D velocity information of an arbitrary moving object regardless of the trajectory. However, the radial velocities and transversal velocities are coupled in the interferometric measurement when there are multiple moving objects in the radar field of view, thus the conventional interferometric radar fails to measure the transversal velocities. In this paper, we propose a new method based on the dual-frequency interferometric radar, which can transmit high-frequency waveforms for radial velocity measurement and low-frequency waveforms for suppressing the inter-correlation terms among different objects, thus providing the transversal velocity measurement for each separate object. Simulation results are provided to validate the effectiveness of the proposed method.