B1C_Signals_Simulation/genMaincode_data.m at main · pandaclover/B1C_Signals_Simulation · GitHub

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%{
  --------------------- 产生weil码 ----------------------------------------
  1） 产生北斗B1C信号数据分量所需的主码
%}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function   Code = genMaincode_data(PRN)

N      = 10243;             % weil码长度

% 主码相位差w
w      = [2678, 4802, 958,  859,  3843, 2232, 124,  4352, 1816, 1126, ...
          1860, 4800, 2267, 424,  4192, 4333, 2656, 4148, 243,  1330, ...
          1593, 1470, 882,  3202, 5095, 2546, 1733, 4795, 4577, 1627, ...
          3638, 2553, 3646, 1087, 1843, 216,  2245, 726,  1966, 670,  ...
          4130, 53,   4830, 182,  2181, 2006, 1080, 2288, 2027, 271,  ...
          915,  497,  139,  3693, 2054, 4342, 3342, 2592, 1007, 310,  ...
          4203, 455,  4318];

% 主码截取点p
p      = [699,  694,  7318, 2127, 715,  6682, 7850, 5495, 1162, 7682, ...
          6792, 9973, 6596, 2092, 19,   10151,6297, 5766, 2359, 7136, ...
          1706, 2128, 6827, 693,  9729, 1620, 6805, 534,  712,  1929, ...
          5355, 6139, 6339, 1470, 6867, 7851, 1162, 7659, 1156, 2672, ...
          6043, 2862, 180,  2663, 6940, 1645, 1582, 951,  6878, 7701, ...
          1823, 2391, 2606, 822,  6403, 239,  442,  6769, 2560, 2502, ...
          5072, 7268, 341];

% 生成B1C数据分量的主码
L      = zeros(1,N);

% 计算长度为N的勒让德序列
for k = 1:N

   t        = mod((k-1)^2, N);
   L(1,t+1) = 1;

end

% 利用勒让德序列生成B1C数据分量主码
Ckwp    = zeros(1,N);
for k = 1:N

    Ckwp(1,k) = xor(L(1, mod(k-1+p(PRN)-1, N)+1), L(1, mod(k-1+p(PRN)-1+w(PRN), N)+1));

end

% 截断
Code   = Ckwp(1:10230);

end