ltrdemo1.m

数字通信第四版原书的例程

function [ret,x0,str]=ltrdemo1(t,x,u,flag);
%LTRDEMO1	is the M-file description of the SIMULINK system named LTRDEMO1.
%	The block-diagram can be displayed by typing: LTRDEMO1.
%
%	SYS=LTRDEMO1(T,X,U,FLAG) returns depending on FLAG certain
%	system values given time point, T, current state vector, X,
%	and input vector, U.
%	FLAG is used to indicate the type of output to be returned in SYS.
%
%	Setting FLAG=1 causes LTRDEMO1 to return state derivitives, FLAG=2
%	discrete states, FLAG=3 system outputs and FLAG=4 next sample
%	time. For more information and other options see SFUNC.
%
%	Calling LTRDEMO1 with a FLAG of zero:
%	[SIZES]=LTRDEMO1([],[],[],0),  returns a vector, SIZES, which
%	contains the sizes of the state vector and other parameters.
%		SIZES(1) number of states
%		SIZES(2) number of discrete states
%		SIZES(3) number of outputs
%		SIZES(4) number of inputs.
%	For the definition of other parameters in SIZES, see SFUNC.
%	See also, TRIM, LINMOD, LINSIM, EULER, RK23, RK45, ADAMS, GEAR.

%	Copyright (c) 1990-94 by The MathWorks, Inc.

% Note: This M-file is only used for saving graphical information;
%       after the model is loaded into memory an internal model
%       representation is used.

% the system will take on the name of this mfile: 
sys = mfilename;
new_system(sys)
simver(1.3)
if(0 == (nargin + nargout))
     set_param(sys,'Location',[588,501,1151,788])
     open_system(sys)
end;
set_param(sys,'algorithm',		'Linear')
set_param(sys,'Start time',	'0.0')
set_param(sys,'Stop time',		'2000')
set_param(sys,'Min step size',	'0.01')
set_param(sys,'Max step size',	'0.1')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',	'')

add_block('built-in/Note',[sys,'/','LQG and Loop Transfer Recovery Controller Design'])
set_param([sys,'/','LQG and Loop Transfer Recovery Controller Design'],...
		'position',[269,15,270,16])

add_block('built-in/Sum',[sys,'/','Sum1'])
set_param([sys,'/','Sum1'],...
		'orientation',2,...
		'position',[360,145,380,165])

add_block('built-in/Sum',[sys,'/','Sum'])
set_param([sys,'/','Sum'],...
		'inputs','+++-',...
		'position',[205,47,225,93])


%     Subsystem  ['excitation',13,'noise'].

new_system([sys,'/',['excitation',13,'noise']])
set_param([sys,'/',['excitation',13,'noise']],'Location',[0,0,262,236])

add_block('built-in/Discrete Transfer Fcn',[sys,'/',['excitation',13,'noise/Zero Order Hold']])
set_param([sys,'/',['excitation',13,'noise/Zero Order Hold']],...
		'Numerator','[sqrt(Cov)]',...
		'Denominator','[sqrt(Ts)]',...
		'Sample time','Ts',...
		'position',[140,61,205,99])

add_block('built-in/White Noise',[sys,'/',['excitation',13,'noise/White Noise']])
set_param([sys,'/',['excitation',13,'noise/White Noise']],...
		'Seed','seed',...
		'position',[55,70,75,90])

add_block('built-in/Outport',[sys,'/',['excitation',13,'noise/out_1']])
set_param([sys,'/',['excitation',13,'noise/out_1']],...
		'position',[235,70,255,90])
add_line([sys,'/',['excitation',13,'noise']],[80,80;130,80])
add_line([sys,'/',['excitation',13,'noise']],[210,80;225,80])
set_param([sys,'/',['excitation',13,'noise']],...
		'Mask Display','plot(t(:),r2(:))',...
		'Mask Type','Continuous White Noise.')
set_param([sys,'/',['excitation',13,'noise']],...
		'Mask Dialogue','White noise for continuous (s-domain) systems.\nBand-limited using zero-order-hold.|Noise Variance:|Sample Time:|Seed')
set_param([sys,'/',['excitation',13,'noise']],...
		'Mask Translate','Cov = @1; Ts = @2; seed = @3; r = rand(1,12)-0.5; r2 = [r(1),r;r,r(12)]; t =[1:13;1:13];')
set_param([sys,'/',['excitation',13,'noise']],...
		'Mask Help','Implemented using white noise into Zero Order Hold block. For faster simulation set sample time to highest value possible but in accordance with the fastest dynamics of system.')
set_param([sys,'/',['excitation',13,'noise']],...
		'Mask Entries','0.1\/1\/68932234\/')


%     Finished composite block ['excitation',13,'noise'].

set_param([sys,'/',['excitation',13,'noise']],...
		'position',[35,42,75,68])

add_block('built-in/Inport',[sys,'/','Inport2'])
set_param([sys,'/','Inport2'],...
		'position',[45,100,65,120])

add_block('built-in/Signal Generator',[sys,'/','Signal Gen.'])
set_param([sys,'/','Signal Gen.'],...
		'Peak','1.000000',...
		'Peak Range','5.000000',...
		'Freq','1.000000',...
		'Freq Range','5.000000',...
		'Wave','Sqr',...
		'Units','Rads',...
		'position',[30,143,75,177])

add_block('built-in/State-space',[sys,'/','Controller'])
set_param([sys,'/','Controller'],...
		'orientation',2,...
		'A','ae',...
		'B','be',...
		'C','ce',...
		'D','de',...
		'Mask Display','LQG/LTR',...
		'Mask Type','LTR CONTROLLER')
set_param([sys,'/','Controller'],...
		'Mask Dialogue','LTR controller.\n(Requires Control Toolbox and RCT)|Controller Matrix A:|Controller Matrix B:|Controller Matrix C:|Controller Matrix D:',...
		'Mask Translate','ae=@1; be=@2; ce=@3; de=@4;')
set_param([sys,'/','Controller'],...
		'Mask Help','LTR controller design. Mask and unmask this block to see how it works.',...
		'Mask Entries','ae\/be\/ce\/de\/',...
		'position',[205,130,295,180])

add_block('built-in/State-space',[sys,'/','Plant'])
set_param([sys,'/','Plant'],...
		'A','a',...
		'B','b',...
		'C','c',...
		'D','d',...
		'position',[270,47,350,93])

add_block('built-in/Scope',[sys,'/','Scope'])
set_param([sys,'/','Scope'],...
		'Vgain','5.000000',...
		'Hgain','10.000000',...
		'Vmax','Inf',...
		'Hmax','20.000000',...
		'Window',[0,0,483,223],...
		'position',[495,57,515,83])

add_block('built-in/Outport',[sys,'/','Outport'])
set_param([sys,'/','Outport'],...
		'position',[490,106,520,124])


%     Subsystem  ['Sensor',13,'Noise'].

new_system([sys,'/',['Sensor',13,'Noise']])
set_param([sys,'/',['Sensor',13,'Noise']],'Location',[0,0,262,236])

add_block('built-in/Outport',[sys,'/',['Sensor',13,'Noise/out_1']])
set_param([sys,'/',['Sensor',13,'Noise/out_1']],...
		'position',[235,70,255,90])

add_block('built-in/White Noise',[sys,'/',['Sensor',13,'Noise/White Noise']])
set_param([sys,'/',['Sensor',13,'Noise/White Noise']],...
		'Seed','seed',...
		'position',[55,70,75,90])

add_block('built-in/Discrete Transfer Fcn',[sys,'/',['Sensor',13,'Noise/Zero Order Hold']])
set_param([sys,'/',['Sensor',13,'Noise/Zero Order Hold']],...
		'Numerator','[sqrt(Cov)]',...
		'Denominator','[sqrt(Ts)]',...
		'Sample time','Ts',...
		'position',[140,61,205,99])
add_line([sys,'/',['Sensor',13,'Noise']],[210,80;225,80])
add_line([sys,'/',['Sensor',13,'Noise']],[80,80;130,80])
set_param([sys,'/',['Sensor',13,'Noise']],...
		'Mask Display','plot(1:20,rand(1,20))',...
		'Mask Type','Continuous White Noise.')
set_param([sys,'/',['Sensor',13,'Noise']],...
		'Mask Dialogue','White noise for continuous (s-domain) systems.\nBand-limited using zero-order-hold.|Noise Variance:|Sample Time:|Seed',...
		'Mask Translate','Cov = @1; Ts = @2; seed = @3;')