The imaging system of SAR is totally different from optic's

thereby

the traditional matching method can not be fully suitable in the case of SAR image process.Based on the development of automatic registration of SAR images

in this paper

a novel method of automatic matching of tie-points with high-resolution SAR is proposed.The method consists of three steps: In the first step

back-trace is employed to determine the type and parameters of the initial mapping function after pyramid images are created;secondly

layered back-trace is used to increase control points

the type and parameters of the optimal mapping function are resolved afterwards;finally

the coordinates of control points are revised on original image resolution in order to acquire the final matched tie-points.The strategy of layered back-trace is employed in this algorithm

which not only resolves the problem of compute efficiency

achieves a higher matching accuracy with more evenly distributed tie-points

but also insures the mapping function to be optimal in MMSE(mean minimum square error) sense.High-resolution airborne SAR images are used in our experiments

and the result shows the proposed algorithm is efficient and effective

where comparing with a traditional method which costs 221s computer time

our method only costs 34s;what is more

it can achieve a sub-pixel matching precision

equaling to 0.284 636 pixels.