Bistatic ISAR Sparse Imaging Method for High-Speed Moving Target Based on Dechirping Processing

Algorithm 1

Flow chart of the sparse imaging algorithm.

Input: Echo vector

Initialization:

Cycle:

(1) Sparse Imaging

   Fix the parameters , calculate the observation matrix , and then solve Equation (42) using the conjugate gradient method.

(2) Parameter Estimation

   Fix the result of sparse imaging, solve the equation using the linear search method [12], golden section search method [29], or some intelligent algorithms, such as particle swarm optimization [30].

(3) Iteration Judgment

   When satisfies the convergence condition , the cycle stops, otherwise, the cycle will continue until the algorithm converges.

Output: the imaging result and estimated parameters .