www.pudn.com > GNSS_SDR.zip > calcLoopCoef.m, change:2006-08-14,size:1705b


function [tau1, tau2] = calcLoopCoef(LBW, zeta, k) 
%Function finds loop coefficients. The coefficients are used then in PLL-s 
%and DLL-s. 
% 
%[tau1, tau2] = calcLoopCoef(LBW, zeta, k) 
% 
%   Inputs: 
%       LBW           - Loop noise bandwidth 
%       zeta          - Damping ratio 
%       k             - Loop gain 
% 
%   Outputs: 
%       tau1, tau2   - Loop filter coefficients  
  
%-------------------------------------------------------------------------- 
%                           SoftGNSS v3.0 
%  
% Copyright (C) Darius Plausinaitis and Dennis M. Akos 
% Written by Darius Plausinaitis and Dennis M. Akos 
%-------------------------------------------------------------------------- 
%This program is free software; you can redistribute it and/or 
%modify it under the terms of the GNU General Public License 
%as published by the Free Software Foundation; either version 2 
%of the License, or (at your option) any later version. 
% 
%This program is distributed in the hope that it will be useful, 
%but WITHOUT ANY WARRANTY; without even the implied warranty of 
%MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
%GNU General Public License for more details. 
% 
%You should have received a copy of the GNU General Public License 
%along with this program; if not, write to the Free Software 
%Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
%USA. 
%-------------------------------------------------------------------------- 
 
%CVS record: 
%$Id: calcLoopCoef.m,v 1.1.2.2 2006/08/14 11:38:22 dpl Exp $ 
 
% Solve natural frequency 
Wn = LBW*8*zeta / (4*zeta.^2 + 1); 
 
% solve for t1 & t2 
tau1 = k / (Wn * Wn); 
tau2 = 2.0 * zeta / Wn;