Patent ID: 8965680
Filing Date: 2015-02-24
Classification: G01S,G08G,H01Q

Abstract:
1. A method for determining bearing in a traffic collision avoidance system, the method comprising: transmitting a first interrogation signal from at least a portion of an array of antenna elements; receiving, by at least a first pair of elements of the array of antenna elements, a first response to the transmitted first interrogation signal from a target, the at least first pair of elements being separated by at most one half of a wavelength (λ) of a response signal; determining, by a processor, a coarse bearing of the received first response; receiving, by at least a second pair of elements of the array of antenna elements, a second response to the transmitted first interrogation signal, the at least second pair of elements being separated by approximately Nλ of the response signal, N being an integer not equal to zero; and determining, by the processor, a first bearing value for the target based on the coarse bearing and the received second response.