Abstract: This invention describes a new Direction Finding (DF) algorithm named as Braided Array Sampling via an Inter-Channel Scheme (BASICS) that can enhance estimation accuracy of the direction of arrival (DOA) to a higher level than existing algorithms. With appropriate analogical reasoning, it can be applied to all kinds of radars and antennas. It breaks the ordinary belief that an array of N antennas can only generate N pictures of spectral for analysis. Without the need of improvement on the system hardware, BASICS assumes many virtual movements of array antenna in order to produce enough linear equations describing Doppler modulations of targets' spectra by those of the virtual movements, and the solutions would give accurate DOA information of possible targets. This invention presents the principle of BASICS and its theoretical supports, as well as the basic conditions to apply BASICS.

Abstract: This invention describes a new Direction Finding (DF) algorithm named as Braided Array Sampling via an Inter-Channel Scheme (BASICS) that can enhance estimation accuracy of the direction of arrival (DOA) to a higher level than existing algorithms. It is originally developed from, and designed for high frequency (HF) radars detecting sea echoes. With appropriate analogical reasoning, it can be applied to all kinds of radars and sonars. It breaks the ordinary belief that an array of N sonars can only generate N pictures of spectral for analysis. Without the need of improvement on the hardware, BASICS assumes virtual movements of sonars in order to produce much more than N spectral for computers to analyze, and therefore provides much more accurate DOA estimation of targets on the sea. This invention presents the principle of BASICS and its theoretical supports, as well as the basic conditions to apply BASICS.