【物理应用】基于matlab GUI功率谱估计【含Matlab源码 329期】

一、获取代码方式

获取代码方式1：
完整代码已上传我的资源：【物理应用】基于matlab GUI功率谱估计【含Matlab源码 329期】

获取代码方式2：
通过订阅紫极神光博客付费专栏，凭支付凭证，私信博主，可获得此代码。

备注：
订阅紫极神光博客付费专栏，可免费获得1份代码（有效期为订阅日起，三天内有效）；

二、功率谱简介

功率谱估计是一种对信号的功率谱密度进行估计的方法，用于表征信号的能量特征随频率的变化关系，是信号处理领域的常用分析方法。具体可以分为三类：

直接法：周期图法(psd)、pwelch
基于滤波器组方法：Capon、Slapain
基于参数化模型的方法：AR、MA、ARMA
主要分为四章介绍功率谱估计，本章对功率谱估计的基本定义即自相关估计及直接法估计进行描述。

1 基本定义



2 面临的问题
一共有两个面临的问题：
因为加窗的问题会产生分辨率变低，频谱泄露的问题（频带主瓣宽->分辨率低，频谱泄露是固定频率周围有抖动，比如30Hz正弦信号在FFT的30Hz附近有明显的波峰旁瓣，分去了主瓣的能量），如下图所示，如果数据长度越趋近无限，则分辨率越好，中间部分越来越窄，泄露越少。

3 改进方法-直接法
本章主要对直接法这种改进方法进行描述

3.1 周期图法

三、部分源代码

function varargout = SsbForm(varargin)
% SSBFORM M-file for SsbForm.fig
%      SSBFORM, by itself, creates a new SSBFORM or raises the existing
%      singleton*.
%
%      H = SSBFORM returns the handle to a new SSBFORM or the handle to
%      the existing singleton*.
%
%      SSBFORM('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in SSBFORM.M with the given input arguments.
%
%      SSBFORM('Property','Value',...) creates a new SSBFORM or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before SsbForm_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to SsbForm_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Copyright 2002-2003 The MathWorks, Inc.

% Edit the above text to modify the response to help SsbForm

% Last Modified by GUIDE v2.5 07-Dec-2008 11:26:04

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @SsbForm_OpeningFcn, ...
                   'gui_OutputFcn',  @SsbForm_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before SsbForm is made visible.
function SsbForm_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to SsbForm (see VARARGIN)

% Choose default command line output for SsbForm
bg=imread('P6.bmp');
axes(handles.axes1);
imshow(bg);
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes SsbForm wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = SsbForm_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --- Executes on selection change in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = get(hObject,'String') returns popupmenu1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu1


% --- Executes during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end


% --- Executes on selection change in popupmenu2.
function popupmenu2_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = get(hObject,'String') returns popupmenu2 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu2


% --- Executes during object creation, after setting all properties.
function popupmenu2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end


% --- Executes on selection change in popupmenu3.
function popupmenu3_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = get(hObject,'String') returns popupmenu3 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu3


% --- Executes during object creation, after setting all properties.
function popupmenu3_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end


% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global BW CW F t ts
t=[-pi:ts:pi];
ts=0.01;
if get(handles.popupmenu1,'value')==1
 elseif get(handles.popupmenu1,'value')==2
   BW='5*sin(t)'
 elseif get(handles.popupmenu1,'value')==3
   BW='10*sin(t)'
 elseif get(handles.popupmenu1,'value')==4
   BW='15*sin(t)'
end
if get(handles.popupmenu3,'value')==1
elseif get(handles.popupmenu3,'value')==2
     F=5
elseif get(handles.popupmenu3,'value')==3
     F=10
 elseif get(handles.popupmenu3,'value')==4
     F=15
end
if get(handles.popupmenu2,'value')==1
elseif get(handles.popupmenu2,'value')==2
    CW='cos(2*pi*F*t)'
elseif get(handles.popupmenu2,'value')==3
    CW='sin(2*pi*F*t)'
end
if get(handles.popupmenu1,'value')==1  | get(handles.popupmenu2,'value')==1|get(handles.popupmenu3,'value')==1
    warndlg('Unfilled Parameter !!!')
else
if   get(handles.popupmenu1,'value')==2
      set(handles.edit1,'string','BW=5*sin(t)');
elseif  get(handles.popupmenu1,'value')==3
      set(handles.edit1,'string','BW=10*sin(t)');
elseif  get(handles.popupmenu1,'value')==4
      set(handles.edit1,'string','BW=15*sin(t)');
 end
 if     CW=='sin(2*pi*F*t)'
      set(handles.edit2,'string','CW=sin(2*pi*F*t)');
 elseif CW=='cos(2*pi*F*t)'
       set(handles.edit2,'string','CW=cos(2*pi*F*t)');
 end
 if     F==5
     set(handles.edit3,'string','FC=5');
 elseif F==10
       set(handles.edit3,'string','FC=10')
 elseif F==15
          set(handles.edit3,'string','FC=15')
 end
end
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
close all
SsbForm

% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
close
SysFirstF


function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double


% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end


  

 

  
1
  
2
  
3
  
4
  
5
  
6
  
7
  
8
  
9
  
10
  
11
  
12
  
13
  
14
  
15
  
16
  
17
  
18
  
19
  
20
  
21
  
22
  
23
  
24
  
25
  
26
  
27
  
28
  
29
  
30
  
31
  
32
  
33
  
34
  
35
  
36
  
37
  
38
  
39
  
40
  
41
  
42
  
43
  
44
  
45
  
46
  
47
  
48
  
49
  
50
  
51
  
52
  
53
  
54
  
55
  
56
  
57
  
58
  
59
  
60
  
61
  
62
  
63
  
64
  
65
  
66
  
67
  
68
  
69
  
70
  
71
  
72
  
73
  
74
  
75
  
76
  
77
  
78
  
79
  
80
  
81
  
82
  
83
  
84
  
85
  
86
  
87
  
88
  
89
  
90
  
91
  
92
  
93
  
94
  
95
  
96
  
97
  
98
  
99
  
100
  
101
  
102
  
103
  
104
  
105
  
106
  
107
  
108
  
109
  
110
  
111
  
112
  
113
  
114
  
115
  
116
  
117
  
118
  
119
  
120
  
121
  
122
  
123
  
124
  
125
  
126
  
127
  
128
  
129
  
130
  
131
  
132
  
133
  
134
  
135
  
136
  
137
  
138
  
139
  
140
  
141
  
142
  
143
  
144
  
145
  
146
  
147
  
148
  
149
  
150
  
151
  
152
  
153
  
154
  
155
  
156
  
157
  
158
  
159
  
160
  
161
  
162
  
163
  
164
  
165
  
166
  
167
  
168
  
169
  
170
  
171
  
172
  
173
  
174
  
175
  
176
  
177
  
178
  
179
  
180
  
181
  
182
  
183
  
184
  
185
  
186
  
187
  
188
  
189
  
190
  
191
  
192
  
193
  
194
  
195
  
196
  
197
  
198
  
199
  
200
  
201
  
202
  
203
  
204
  
205
  
206
  
207
  
208
  
209
  
210
  
211
  
212
  
213
  
214
  
215
  
216
  
217
  
218
  
219
  
220
  
221
  
222
  
223
  
224
  
225
  
226
  
227
  
228
  
229
  
230
  
231
  
232
  
233
  
234
  
235
  
236
  
237
  
238
  
239
  
240
  
241
  
242
  
243
  
244
  
245
  
246
  
247
  
248
 

四、运行结果

五、matlab版本及参考文献

1 matlab版本
2014a

2 参考文献
[1] 门云阁.MATLAB物理计算与可视化[M].清华大学出版社，2013.

文章来源: qq912100926.blog.csdn.net，作者：海神之光，版权归原作者所有，如需转载，请联系作者。

原文链接：qq912100926.blog.csdn.net/article/details/113851483