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Introduce the 5D signal chain: ICD BPSK(10) replica, PCPS acquisition, DLL-PLL tracking (1 ms data component), and a first-cut B-CNAV2 decoder (preamble + CRC-24Q, MT10/MT11/MT30, systematic 288 bits, no 64-ary LDPC). GEO and BDS-2 PRNs are not assigned B2a channels. B2a-only SPP remaps 5D onto RTKLIB slot 0 with lam[0]=c/FREQ5. Signed-off-by: huangchuhan <huangchh37@mail2.sysu.edu.cn>