Direction of arrival estimation

A method for use in a of direction of arrival estimation for a signal, comprising:

• receiving, at a processor, a set of measurements of a signal by an array of sensor elements;
• iteratively generating, by a processor, a plurality of measures of a direction of arrival estimate, the plurality of measures related to first and second grids of candidate direction of arrivals respectively, the first and second grids offset from each other by a predetermined amount;
• generating an angular discriminant for each iteration, wherein the first and second grids in a subsequent iteration are offset from the first and second grids in a current iteration by an amount determined by the angular discriminant for the current iteration;
• and
• generating a direction of arrival estimation based on the angular discriminant from at least one iteration.

A method comprising receiving, at a processor, input signals representative of detection a signal received at a plurality of spatially separated sensor elements:

• determining, by a processor, a plurality of sparse solutions for Ŝt in Vn=ϕ(Θt)Ŝt;
• and
• generating, by a processor an estimated direction of arrival of the signal received at the sensor elements, wherein the estimated direction of arrival is determined based on an error discriminant determined from the plurality of sparse solutions for Ŝt;
• wherein:
• Vn includes phase information of the input signals;
• Θt represents a grid of points for candidate directions of arrival;
• and
• ϕ is a function of Θt and locations of the sensor elements.

A method comprising:

• receiving, at a processor, input signals representative of detection of one or more signals received at respective plurality of spatially separated sensor elements;
• in an initial determination and in at least a first iteration determining, by a processor, based on phase information in the input signals and a known geometry of the spatially separated sensor elements, one or more sparse solutions indicating one or more estimated directions of arrival amongst a set of candidate directions of arrival, wherein for each iteration the set of candidate directions of arrival are rotated;
• and
• generating data indicative of the solution for the first iteration or a subsequent iteration, wherein the generated data represents one or more direction of arrival estimates for the one or more signals.