Chebyshev approximation of the null function by an affine combination of complex exponential functions

We describe the theoretical solution of an approximation problem that uses a finite weighted sum of complex exponential functions. The problem arises in an optimization model for the design of a telescopes array occurring within optical interferometry for direct imaging in astronomy. The problem is to find the optimal weights and the optimal positions of a regularly spaced array of aligned telescopes, so that the resulting interference function approximates the zero function on a given interval. The solution is given by means of Chebyshev polynomials. Key words. Chebyshev approximation, Chebyshev polynomials, complex exponential functions, interferometry, optimization

• Type: Journal
• Year: 2010
• Where: JAT
• Authors: Paul Armand, Joël Benoist, Elsa Bousquet
• Keywords: Chebyshev Polynomials, Complex Exponential Functions, Finite Weighted Sum, JAT 2010