Analysis of SAR Raw Data Compression Algorithm Based on DCT
Zhaoda Zhu · Telecommunication Engineering · 2009
According to the characteristics of SAR raw data coefficients in DCT transform domain, an algorithm of variable bit rate allocation according to energey distribution of every subband in DCT transform domain-Block Adaptive Quantization in DCT domain (DCT-BAQ) is analyzed. The comparison between DCT-BAQ and time domain BAQ is analysed. By using a real SAR raw data, compression and decompression are performed respectively. The SQNR and SDNR are achieved. The images correspond to the two algorithms are gained. The experiments manifest that with same bit rate, SQNR and SDNR of DCT-BAQ surpass that of time domain BAQ. In addition, as DCT transform has the characteristics of real number operation and fast speed algorithm, therefore, DCT-BAQ has some advantage in the domain of SAR raw data compression.