2D-DOA Estimation of Multiple Frequency-Hopping Signals

In order to use the two-dimensional direction-of-arrival(2D-DOA) of the frequency hopping(FH) signals for FH signals sorting, identifying and tracking, an FH signal 2D-DOA estimation algorithm based on Unitary ESPRIT is proposed in this paper. Firstly, the time-frequency map of FH signals is amended via morphological filtering to extract the effective hop of FH signals. Then, the data model of array for effective hop is established based on the structure of the planar antenna array. Finally, the Unitary ESPRIT is exploited to estimate the 2D-DOA of FH signals. This method transforms the received data from the complex field to the real domain by the unitary transformation to decrease the calculation complexity and reuses the data during constructing the real matrix to improve the accuracy of the estimation. The simulation results show that the proposed algorithm has good performance.