Direction of arrival estimation
AssigneeMacquarie University
InventorsSam Reisenfeld, Audri Biswas
Life of this patent
Estimating the term…
Abstract
Iterative methods for direction of arrival estimation of a signal at a receiver with a plurality of spatially separated sensor elements are described. A quantized estimate of the angle of arrival is obtained from a compressive sensing solution of a set of equations. The estimate is refined in a subsequent iteration by a computed error based a quantized estimate of the direction of arrival in relation to quantization points offset from the quantization points for the first quantized estimate of the angle of arrival. The iterations converge on an estimated direction of arrival.
Claims20
A method for estimating a direction of arrival of a signal, comprising:
- receiving, at a processor, a set of measurements of the signal from an antenna element array comprising a plurality of spatially separated antenna elements, wherein the set of measurements of the signal comprises a set of complex envelope voltage outputs;
- and
- in an iterative process:
- applying, by the processor, a computational technique for solving an under-determined set of linear equations to the set of complex envelope voltage outputs and a plurality of grids of candidate directions of arrival to generate a plurality of solutions, the plurality of solutions indicating a first interim direction of arrival estimate in relation to a first grid of the plurality of grids of candidate directions of arrival and a second interim direction of arrival estimate in relation to a second grid of the plurality of grids of candidate directions of arrival, wherein the first grid and the second grid include a number of grid points that is higher than the set of complex envelope voltage outputs and are rotated relative to each other;
- generating, by the processor, a first angular discriminant based on the first interim direction of arrival estimate and the second interim direction of arrival estimate;
- and
- generating, by the processor, a direction of arrival estimation between the first interim direction of arrival estimate and the second interim direction of arrival estimate based on the first angular discriminant.
A method for estimating a direction of arrival of a signal comprising:
- receiving, at a processor, input signals, wherein the input signals comprise a set of measurements of one or more signals that is representative of detection of the one or more signals received at a respective plurality of spatially separated sensor elements;
- in an initial determination and in at least a first iteration determining, by the processor, based on phase information in the input signals and a known geometry of the respective plurality of spatially separated sensor elements, at least one sparse solution 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 wherein each iteration is performed based on preceding sparse solutions to cause the at least the first iteration to display convergence in the at least one sparse solution;
- and
- determining by the processor, based on the preceding sparse solutions, that a convergence threshold for the at least one sparse solution has been satisfied and in response generating data indicating a direction of arrival estimation for the signal based on the preceding sparse solutions.
An iterative method for direction of arrival estimation of a signal at a receiver with a plurality of spatially separated sensor elements, the method comprising:
- generating a first quantized estimate of an angle of arrival from a compressive sensing solution of a set of equations relating sensor output signals from the plurality of spatially separated sensor elements to direction of arrival, wherein the set of equations relates a set of measurements of the sensor output signals;
- and
- refining the first quantized estimate in at least one subsequent iteration by a computed error based a quantized estimate of the direction of arrival in relation to quantization points offset from the quantization points for the first quantized estimate of the angle of arrival, wherein the offset is selected to cause the at least one subsequent iteration to converge on an estimated direction of arrival.
Dependencies are inferred from the claim text.