Real-time Compression for Acoustic Array Time-Domain Data

The Navy needs to transmit channel level time-domain data via SATCOM links in order to transmit acoustic array data to onshore signal processing to improve the Detection, Localization, and Classification mission loop. In order for this transmission to be viable, a near-lossless compression codec must be designed to meet at least a 5-to-1 compression ratio in real-time. This 5-to-1 compression ratio will be a starting place for transmitting time-domain data from SURTASS ASW towed arrays for phase I, as the focus of this SBIR is to maximize the compression ratio, while staying within the bounds of processing power and signal integrity. With this SBIR, the ASSETT team will bring extensive knowledge of ambient ocean noise leveraged from previous contract work, as well as the in-depth knowledge of compression theory and SURTASS ASW software from L3 Adaptive Methods. The ASSETT team will develop 4 principle methods that will additively combine to create a codec that meets and exceeds the compression ratio goal while meeting any other requirements on processing power, signal integrity, and latency: Statistical redundancy in the K-Omega domain’s acoustic zone, Multi-dimensional linear predictive filters, Lossy compression of unimportant data in the K-Omega domain’s non-acoustic zone, and multi-dimensional entropy encoding.