Patent ID: 7750849

Claim:
A method for determining the spatial frequency of a signal in a given plane intersected by said signal, said plane including a plurality of sensors arranged in arrays, the method comprising the steps of: sampling said signal with a first sensor array, the distance between adjacent sensors defining a first spatial sampling frequency, the first spatial sampling frequency being lower than the spatial frequency of the signal; sampling said signal with a second sensor array, the distance between adjacent sensors defining a second spatial sampling frequency lower than said first spatial sampling frequency, said first and second sensor arrays being interleaved; identifying a signal pair of corresponding signals of the signal sampled with the first sensor array with the signal sampled with the second sensor array, the signal pair being identified by detecting a high correlation factor between the corresponding signals; identifying a relative difference between the first spatial sampling frequency and the second spatial sampling frequency; determining a first spatial frequency shift factor based on the first spatial sampling frequency and the relative difference between the first spatial sampling frequency and the second spatial sampling frequency; and, up-converting the signal sampled with the first sensor array using the first spatial frequency shift factor to obtain the spatial frequency of said signal.