f = 500;
Ts = 1/f;    %设置采样周期
n = 12;        %设置数据个数
Mag = 0.1;       %设置幅值 
p = 2^n-1;
ms = Mag * idinput(p,'prbs');
t = 0:Ts:Ts*(p-1);
%M =[t',ms];   %生成M序列
t2 =  0:Ts:Ts*(20*p-1);
ms2 = [ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms;ms];
M =[t2',ms2];   %生成M序列


% figure (1)
% plot(t',ms)
% ylim([-1.5*Mag,1.5*Mag])
% simulatetime = Ts*(p-1);
sampletime = Ts;