Satellite images have key features such as; large data size, strong correlation between adjacent pixels and high redundancy. Unfortunately, traditional operation modes used to implement the Advanced Encryption Standard (AES) encrypt data without taking into account these specific image features. As a result, the traditional modes are not suitable for image encryption. In this paper, we present a robust satellite image encryption scheme based on discretized chaotic maps and AES. The discretized chaotic maps are used to achieve a confusion and key generation in order to improve the performance of security, especially the sensitivity to plain image. The simulation results show that the proposed technique presents attractive features, including a high level of security, large key space with improved sensitivities to key and plain image.