Robust symmetrical number system direction finding arrays with virtual spacing

This research demonstrated how RSNS mapping is used to obtain unambiguous AOA estimates directly from phase measurements from the array elements. It is also possible to use the measured phases from elements with fixed spacing to simulate a nonphysical dasiavirtualpsila array with different element spacing. In order to apply the RSNS algorithm there are restrictions on the selected virtual array moduli. The virtual interferometers can be used to increase the resolution of a DF system over a limited spatial sector. Monte Carlo simulations have included thermal noise, channel errors, frequency errors and spacing errors [Kwai, 2007 and Pace, 2001]. The virtual array processing generally requires a higher SNR due to the higher resolution. The logical implementation of the RSNS is to use a coarse resolution for low SNR and switch to higher resolutions as the SNR increases [Chen, 2004].