Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1997-07-09
1999-07-13
Lobo, Ian J.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342191, G01S 1390
Patent
active
059232781
ABSTRACT:
An interferogram is an array of phases, often generated from the inverse tangent of a ratio of an imaginary component divided by a real component. The array is said to be a wrapped phase array when the phase angle is modulo between zero and 2.pi.. A method of processing a wrapped phase array into an unwrapped phase array includes computing a first array from the wrapped phase array, each element of the first array being based on a discrete Poisson difference equation, processing the first array through a two dimensional FFT to form a second array, scaling the second array by a scaling function to form a third array, and processing the third array through an inverse two dimensional FFT to form the unwrapped phase array. The step of computing a first array includes forming a twice unfolded array from the wrapped phase array, computing a row difference array, an element in the row difference array being based on a difference between an element in a particular row in the twice unfolded array and an element in an adjacent row in the twice unfolded array, computing a column difference array, an element in the column difference array being based on a difference between an element in a particular column in the twice unfolded array and an element in an adjacent column in the twice unfolded array, computing a double row difference array, an element in the double row difference array being based on a difference between an element in the particular row in the row difference array and an element in an adjacent row in the row difference array, computing a double column difference array, an element in the double column difference array being based on a difference between an element in the particular column in the column difference array and an element in an adjacent column in the column difference array, and adding the double row difference array to the double column difference array element by element to form the first array.
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Mansfield Arthur W.
Poehler Paul L.
Lobo Ian J.
Science Applications International Corporation
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