Export Spectrum Analyser trace to workspace or file

Question

Derek Eccles 2020-3-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/511130-export-spectrum-analyser-trace-to-workspace-or-file

编辑： Fangjun Jiang 2020-3-19

Hi, as the title says, I want to find out how to export the trace (dBm) from a Spectrum Analyser, in Simulink, to either the workspace or preferably to an external (EXCEL spreadsheet) file ?

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Derek Eccles 2020-3-17

Assuming it is possible to export the dBm trace from the Simulink spectrum analyzer to an excel spreadsheet, please see my latest attempts :

>> sablock = fsk, '/Spectrum Analyzer' ;

sablock =

0

4

0

1

>> config = get.param ( [sablock],'Scope Configuration');

Undefined variable "get" or class "get.param".

>> config = get_param ( [sablock],'Scope Configuration');

Error at element 1 of first input to get_param:

block_diagram does not have a parameter named 'Scope Configuration'

>> config = get_param ( [sablock],'Spectrum Analyzer Configuration');

Error at element 1 of first input to get_param:

block_diagram does not have a parameter named 'Spectrum Analyzer Configuration'

>> config = get_param ( [sablock],'dBm');

Error at element 1 of first input to get_param:

block_diagram does not have a parameter named 'dBm'

Interesting the sablock command returns a (1x7) array with numbers I dont recognise and why 7 values ?

I think I need to specify a Spectrum Analyzer Configuration object for the spectrum analyzer block, then use the

spectrumTable = getSpectrumData(scope) command to read the dBm trace ? As you can see from my attempts above I am having trouble specifying the sa configuration using the config and get_param commands/functions.

Any help would be most welcome.

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Answer 1

Fangjun Jiang 2020-3-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/511130-export-spectrum-analyser-trace-to-workspace-or-file#answer_420581

编辑：Fangjun Jiang 2020-3-17

Run this to open the document and example, I believe the answer can be found there. The key is probabaly the function getMeasurementsData()

web(fullfile(docroot, 'dsp/ref/dsp.spectrumanalyzer.getmeasurementsdata.html'))

or from https://www.mathworks.com/help/releases/R2019b/dsp/ref/dsp.spectrumanalyzer.getmeasurementsdata.html

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Derek Eccles 2020-3-17

Hi Fangjun, many thanks for you response.

Unfortunately, I am still not having much success :

>> sablock = fsk, '/Spectrum Analyzer' ;

sablock =

0

4

0

1

>> data = [];

>> data = [data;getMeasurementsData(sablock)];

Undefined function 'getMeasurementsData' for input arguments of type 'double'.

>> data = getMeasurementsData(sablock)

Undefined function 'getMeasurementsData' for input arguments of type 'double'.

>> data = [data;getMeasurementsData(sablock)];

Undefined function 'getMeasurementsData' for input arguments of type 'double'.

>> sablock = fsk, '/Spectrum Analyzer' ;

sablock =

0

4

0

1

>> cfg = get_param ( [sablock],'ScopeConfiguration');

Error at element 1 of first input to get_param:

block_diagram does not have a parameter named 'ScopeConfiguration'

>> cfg.CursorMeasurements.Enable = true;

cfg.ChannelMeasurements.Enable = true;

cfg.PeakFinder.Enable = true;

cfg.DistortionMeasurements.Enable = true;

>> data = getMeasurementsData(cfg)

Undefined function 'getMeasurementsData' for input arguments of type 'struct'.

>> Undefined function 'getMeasurementsData' ?

Fangjun Jiang 2020-3-19

编辑：Fangjun Jiang 2020-3-19

They all depend on your simulation data and setting.

If your model name is 'fsk.slx', then specifying the full path of the scope block should be scope='fsk/Spectrum Analyzer'. type "fsk" before and after the simulation to see what happened. "fsk" should just bring up your model.

Derek Eccles 2020-3-19

"They all depend on your simulation data and setting." - Is there something I can read to help me understand this ? For example I have stipulated 100 samples in my model but 163 are returned ?

Tried adding path in MATLAB with the following results ?

addpath('Derek/1electronics/1TELECOMMS/4MODULATION/1FSK/2-FSK MODULATOR/BASEBAND/NONCOHERENT')

Warning: Name is nonexistent or not a directory: C:\Derek\1electronics\1TELECOMMS\4MODULATION\1FSK\2-FSK

Modulator\BaseBand\NONCOHERENT\Derek\1electronics\1TELECOMMS\4MODULATION\1FSK\2-FSK

MODULATOR\BASEBAND\NONCOHERENT

> In path (line 109)

In addpath (line 86)

>> addpath('Derek/1electronics/1TELECOMMS/4MODULATION/1FSK/2-FSK MODULATOR/BASEBAND/NONCOHERENT'/fsk.slx')

Undefined variable "fsk" or class "fsk.slx".

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