Antenna arrangement for doa estimation

A method for estimating direction of arrival (DOA) for a transmitting device, the method comprising:

• performing a first DOA estimation for the transmitting device at a first frequency;
• performing a second DOA estimation for the transmitting device at a second frequency, the second frequency being of larger magnitude than the first frequency, the second DOA estimation resulting in at least one second frequency grating lobe and a second frequency main lobe;
• separating the second frequency grating lobe from the second frequency main lobe using results from the first DOA estimation;
• and
• forming a resulting DOA estimation from the pointing direction of the second frequency main lobe.

An antenna arrangement for estimating a direction of arrival (DOA) for a transmitting device, the antenna arrangement comprising:

• at least two antenna functions;
• and
• a control unit connected to the at least two antenna functions,
• wherein the control unit is configured to determine a first preliminary DOA estimation for the transmitting device, wherein the first preliminary DOA estimation is determined at a first frequency that produces a first frequency main lobe corresponding to an actual DOA for the transmitting device,
• wherein the control unit is configured to calculate a second preliminary DOA estimation for the transmitting device, wherein the second preliminary DOA estimation is determined at a second frequency that is larger in magnitude than the first frequency and that produces a second frequency main lobe corresponding to the actual DOA for the transmitting device, and at least one second frequency grating lobe,
• wherein the control unit is configured to distinguish the second frequency main lobe from the at least one second frequency grating lobe by comparing the first preliminary DOA estimation to the second preliminary DOA estimation, and
• wherein the control unit is configured to identify the pointing direction of the second frequency main lobe as an actual DOA estimation.

A method for estimating direction of arrival (DOA) for a transmitting device, the method comprising:

• producing a first preliminary DOA estimation for the transmitting device at a first frequency, the first frequency being selected to produce a first frequency main lobe corresponding to an actual DOA for the transmitting device;
• producing a second preliminary DOA estimation or the transmitting device at a second frequency, the second frequency being selected to be larger in magnitude than the first frequency and to produce a second frequency main lobe corresponding to the actual DOA for the transmitting device and at least one second frequency grating lobe;
• distinguishing the second frequency grating lobe from the second frequency main lobe using results from the first preliminary DOA estimation;
• and
• identifying an actual DOA estimation from the pointing direction of the second frequency main lobe.