Secondary radar data compression method, decompression method, device and system

The invention discloses a secondary radar data compression method, device and system, and a secondary radar data decompression method, device and system. The compression method comprises the following steps: acquiring AD original data of a secondary radar signal and caching the AD original data; carrying out normalization processing on the AD original data; dividing the normalized data according to a preset frame length, wherein a divided data group comprises a compressible data group and/or an incompressible data group; when a compressible data set appears in the channel, data packing and compression are carried out on the compressible data set according to a compressed coded data format, and when an incompressible data set appears in the packing and compression process, the packed and compressed data are sent to an AD data receiving end; and when the incompressible data group appears in the channel, performing data packaging on the incompressible data group according to an incompressible data format, and wh