Abstract:

In modern electronic warfare, for the direction finding of multiple wideband coherent radiation sources under the background of decoys, the algorithms for signal number estimation and direction finding of multiple wideband coherent radiation sources are presented based on single baseline in this paper. Firstly, new signals are created by using conjugate multiplication of signal spectrums received by two antenna arraies. According to the spectrum architectural feature of new signals, the number of radiation sources can be estimated. In case the number of sources is given, by using the fractional time delay estimation algorithm based on the wideband signal phase spectrum, the time delays between radiation source signals received by two antennas can be got indirectly. So the directions of these radiation sources can be found according to the time delays. The algorithms have the feature of simple equipment and only the single baseline composed of two antennas is required. The simulation results show that the number of multiple wideband coherent radiation sources can be estimated accurately and directions of multiple radiation sources can be found accurately under certain condition.

Key words: Signal number estimation, Long baseline direction finding, Multiple radiation sources, Wideband coherent signal, Single baseline