Baq data compression

  • What is the fastest compression method?

    LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core, scalable with multi-cores CPU.
    It features an extremely fast decoder, with speed in multiple GB/s per core, typically reaching RAM speed limits on multi-core systems..

Application of a Block Adaptive Quantisation-like (BAQ) raw data compressor adds quantisation noise to the raw data which degrades the data Signal-to-Noise Ratio (SNR). A BAQ that applies a constant bit rate independent of radar signal power is not optimal.
Data compression is an essential requirement for spaceborn SAR sensors to reduce the data volume that must be temporarily stored onboard, transmitted from.

Is a Baq based on a constant bit rate?

A BAQ that applies a constant bit rate independent of radar signal power is not optimal

It produces a degradation of the SNR which varies with the power of the detected radar signal

To overcome this, SENTINEL-1 Level-0 data products are compressed using Flexible Dynamic Block Adaptive Quantisation (FDBAQ)

What is a block adaptive quantisation-like (Baq) raw data compressor?

Application of a Block Adaptive Quantisation-like (BAQ) raw data compressor adds quantisation noise to the raw data which degrades the data Signal-to-Noise Ratio (SNR)

A BAQ that applies a constant bit rate independent of radar signal power is not optimal


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