Real-Time DSP Implementation of 3D Wavelet Reversible Variable-length Coding for Ultraspectral Sounder Data Compression

Reversible variable-length codes (RVLCs) allow instantaneous decoding in both directions, which affords better detection of bit errors due to synchronization losses over a noisy channel. Earlier, we developed 3D wavelet reversible variable- length coding (3DWT-RVLC) for lossless compression of ultraspectral sounder data, which has significantly better error resilience than JPEG2000 Part 2 at only a small reduction in compression gain (1). To explore the feasibility of 3DWT-RVLC for real-time satellite onboard processing, we implement a memory-limited DSP version of 3DWT-RVLC. Experimental results for the 10 AIRS ultraspectral test granules show that the DSP-based 3DWT-RVLC yields an average compression ratio of 2.36, comparable to 2.51 of the original 3DWT-RVLC from our previous work.