A correlator finds the frame: Barker-13 in a stream of chips

Slide a Barker-13 preamble through a stream of chips and watch the correlator peak at 13 where it lines up. Flip chips to add noise; see when the lock fails.

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Where the numbers come from

gHashTag/t27 specs/fpga/bpsk.t27 (t27 master): every value on the page is its fn bodies, compiled to wasm (logic.js)
R. H. Barker, Group synchronizing of binary digital systems, in Communication Theory, Butterworth, 1953: the length-13 code and its sidelobes of at most 1
gHashTag/t27 specs/fpga/bpsk.t27: the ZeroDSP BPSK modem core, BARKER13_BITS, correlate, rx_push, SYNC_THRESHOLD 9

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