3 June 2018

MIL 188-110C App.D: 9KHz/7200Bd & 12KHz/9600Bd

9KHz/7200Bd & 12KHz/9600Bd WBHF waveforms spotted on 9 MHz band. Both the ACFs show a value of 120ms that corresponds to 864 symbols for the 7200 Bd waveform (768 uk + 96k) and 1152 symbols for the 9600 waveform (1024 uk + 128 k).



The extra spikes in ACF diagrams, more evident in CCF, in my guess are due to the cyclically rotated version of the mini-probe which is utilized to identify the long interleaver block boundary (MIL 188-110D #D.5.2.2). Note that 2 data block make 4608-bit blocks (768x2x3) and 21 data blocks make 64512-bit block (1024x21x3), therefore the CCF spikes are related since 64512/4608=14


 

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