parmest.m

数字通信第四版原书的例程

function [ret,x0,str,ts,xts]=parmest(t,x,u,flag);
%PARMEST	is the M-file description of the SIMULINK system named PARMEST.
%	The block-diagram can be displayed by typing: PARMEST.
%
%	SYS=PARMEST(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 PARMEST to return state derivatives, FLAG=2
%	discrete states, FLAG=3 system outputs and FLAG=4 next sample
%	time. For more information and other options see SFUNC.
%
%	Calling PARMEST with a FLAG of zero:
%	[SIZES]=PARMEST([],[],[],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.

% 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',[12,64,567,476])
     open_system(sys)
end;
set_param(sys,'algorithm',     'RK-45')
set_param(sys,'Start time',    '0.0')
set_param(sys,'Stop time',     '10000')
set_param(sys,'Min step size', '0.0001')
set_param(sys,'Max step size', '5')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '')

add_block('built-in/Constant',[sys,'/','Parameter'])
set_param([sys,'/','Parameter'],...
		'Value','10',...
		'position',[45,96,75,124])

add_block('built-in/Signal Generator',[sys,'/',['Parameter',13,'Variation']])
set_param([sys,'/',['Parameter',13,'Variation']],...
		'Peak','4.000000',...
		'Peak Range','20.000000',...
		'Freq','0.100000',...
		'Freq Range','0.500000',...
		'Wave','Sqr',...
		'Units','Rads',...
		'position',[35,23,80,57])

add_block('built-in/Sum',[sys,'/','Sum3'])
set_param([sys,'/','Sum3'],...
		'hide name',0,...
		'position',[110,65,125,85])

add_block('built-in/Scope',[sys,'/','System output'])
set_param([sys,'/','System output'],...
		'Vgain','10.000000',...
		'Hgain','150.000000',...
		'Vmax','20.000000',...
		'Hmax','300.000000',...
		'Window',[853,132,1086,263],...
		'position',[470,73,495,107])

add_block('built-in/Scope',[sys,'/','Error'])
set_param([sys,'/','Error'],...
		'Vgain','5.000000',...
		'Hgain','150.000000',...
		'Vmax','10.000000',...
		'Hmax','300.000000',...
		'Window',[573,151,829,282])
open_system([sys,'/','Error'])
set_param([sys,'/','Error'],...
		'position',[505,162,530,198])

add_block('built-in/Note',[sys,'/','System under test'])
set_param([sys,'/','System under test'],...
		'position',[325,45,330,50])

add_block('built-in/Sum',[sys,'/','Sum'])
set_param([sys,'/','Sum'],...
		'hide name',0,...
		'inputs','+-',...
		'position',[255,80,270,100])

add_block('built-in/Transfer Fcn',[sys,'/','Transfer Fcn'])
set_param([sys,'/','Transfer Fcn'],...
		'hide name',0,...
		'Numerator','[2,1]',...
		'Denominator','[2,5,3]',...
		'position',[285,70,365,110])

add_block('built-in/Signal Generator',[sys,'/','excitation'])
set_param([sys,'/','excitation'],...
		'Peak','1.940000',...
		'Peak Range','2.000000',...
		'Freq','2.000000',...
		'Freq Range','2.000000',...
		'Wave','Saw',...
		'Units','Rads',...
		'position',[75,158,120,192])

add_block('built-in/Sum',[sys,'/','Sum1'])
set_param([sys,'/','Sum1'],...
		'hide name',0,...
		'inputs','+-',...
		'position',[435,170,450,190])

add_block('built-in/Scope',[sys,'/','Estimate'])
set_param([sys,'/','Estimate'],...
		'Vgain','15.000000',...
		'Hgain','150.000000',...
		'Vmax','30.000000',...
		'Hmax','300.000000',...
		'Window',[574,416,831,543])
open_system([sys,'/','Estimate'])
set_param([sys,'/','Estimate'],...
		'position',[390,252,415,288])

add_block('built-in/Note',[sys,'/',['Parameter Estimation',13,'(Double click on the "?" for more info)']])
set_param([sys,'/',['Parameter Estimation',13,'(Double click on the "?" for more info)']],...
		'position',[196,330,201,335])

add_block('built-in/Transfer Fcn',[sys,'/','Transfer Fcn1'])
set_param([sys,'/','Transfer Fcn1'],...
		'hide name',0,...
		'Numerator','[2,1]',...
		'Denominator','[2,5,3]',...
		'position',[305,165,390,205])

add_block('built-in/Sum',[sys,'/','Sum2'])
set_param([sys,'/','Sum2'],...
		'hide name',0,...
		'inputs','+-',...
		'position',[270,175,285,195])

add_block('built-in/Product',[sys,'/','Product'])
set_param([sys,'/','Product'],...
		'hide name',0,...
		'position',[235,170,250,190])

add_block('built-in/Product',[sys,'/',['Parameter',13,'being',13,'estimated']])
set_param([sys,'/',['Parameter',13,'being',13,'estimated']],...
		'position',[180,66,200,99])

add_block('built-in/Note',[sys,'/',['estimated',13,'parameter']])
set_param([sys,'/',['estimated',13,'parameter']],...
		'position',[325,235,330,240])

add_block('built-in/Note',[sys,'/',['error',13,'signal']])
set_param([sys,'/',['error',13,'signal']],...
		'position',[470,145,475,150])

add_block('built-in/Product',[sys,'/','Product1'])
set_param([sys,'/','Product1'],...
		'hide name',0,...
		'position',[160,260,175,280])

add_block('built-in/Transfer Fcn',[sys,'/','Transfer Fcn2'])
set_param([sys,'/','Transfer Fcn2'],...
		'hide name',0,...
		'Denominator','[1,0]',...
		'position',[190,250,215,290])

add_block('built-in/Note',[sys,'/',['To start and stop the simulation, use the "Start//Stop"',13,'selection in the "Simulation" pull-down menu']])
set_param([sys,'/',['To start and stop the simulation, use the "Start//Stop"',13,'selection in the "Simulation" pull-down menu']],...
		'position',[194,370,199,375])


%     Subsystem  'More Info'.

new_system([sys,'/','More Info'])
set_param([sys,'/','More Info'],'Location',[50,150,431,359])

add_block('built-in/Note',[sys,'/',['More Info/The changing value of the gain applied in the ',13,'Product block "Parameter being estimated" is ',13,'the quantity being estimated.']])
set_param([sys,'/',['More Info/The changing value of the gain applied in the ',13,'Product block "Parameter being estimated" is ',13,'the quantity being estimated.']],...
		'position',[185,60,190,65])

add_block('built-in/Note',[sys,'/',['More Info/This system estimates a single scalar parameter.',13,'Open the scopes and run the simulation.']])
set_param([sys,'/',['More Info/This system estimates a single scalar parameter.',13,'Open the scopes and run the simulation.']],...
		'position',[180,15,185,20])

add_block('built-in/Note',[sys,'/',['More Info/Watch the system estimate and error respond as the',13,'gain parameter changes during the simulation.']])
set_param([sys,'/',['More Info/Watch the system estimate and error respond as the',13,'gain parameter changes during the simulation.']],...
		'position',[187,125,192,130])
set_param([sys,'/','More Info'],...
		'Mask Display','?')


%     Finished composite block 'More Info'.

set_param([sys,'/','More Info'],...
		'hide name',0,...
		'Drop Shadow',4,...
		'position',[340,335,367,360])
add_line(sys,[395,185;430,185])
add_line(sys,[255,180;265,180])
add_line(sys,[290,185;300,185])
add_line(sys,[395,185;395,220;255,220;265,190])
add_line(sys,[455,180;500,180])
add_line(sys,[180,270;185,270])
add_line(sys,[220,270;385,270])
add_line(sys,[125,175;135,175;135,90;175,90])
add_line(sys,[370,90;465,90])
add_line(sys,[220,270;240,270;240,235;220,235;230,185])
add_line(sys,[370,90;410,90;410,175;430,175])
add_line(sys,[455,180;470,180;470,310;135,310;135,275;155,275])
add_line(sys,[205,85;250,85])
add_line(sys,[275,90;280,90])
add_line(sys,[370,90;390,90;390,140;240,140;250,95])
add_line(sys,[125,175;135,175;135,265;155,265])
add_line(sys,[135,175;230,175])
add_line(sys,[85,40;95,40;105,70])
add_line(sys,[80,110;95,110;105,80])
add_line(sys,[130,75;175,75])

% Return any arguments.
if (nargin | nargout)
	% Must use feval here to access system in memory
	if (nargin > 3)
		if (flag == 0)
			eval(['[ret,x0,str,ts,xts]=',sys,'(t,x,u,flag);'])
		else
			eval(['ret =', sys,'(t,x,u,flag);'])
		end
	else
		[ret,x0,str,ts,xts] = feval(sys);
	end
end