analyze link budgets for satellite communications -凯发k8网页登录

configuration including p.618 link availability analysis

the app supports analyzing the satellite communications link availability through the propagation loss model defined in recommendation itu-r p.618-13. for details on the p.618 propagation loss model, see .

to include itu-r p.618 propagation losses for availability analysis, select the include p.618 losses checkbox on the budget analyzer tab. if the mat-files with digital maps are not available on the path, the following dialog box appears. click the download and extract button to add the required map files to the matlab path.

alternatively, you can download and unpack the mat-files by entering this code at the matlab command prompt.

maps = exist('maps.mat','file');
p836 = exist('p836.mat','file');
p837 = exist('p837.mat','file');
p840 = exist('p840.mat','file');
matfiles = [maps p836 p837 p840];
if ~all(matfiles)
    if ~exist('iturdigitalmaps.tar.gz','file')
        url = 'https://www.mathworks.com/supportfiles/spc/p618/iturdigitalmaps.tar.gz';
        websave('iturdigitalmaps.tar.gz',url);
        untar('iturdigitalmaps.tar.gz');
    else
        untar('iturdigitalmaps.tar.gz');
    end
    addpath(cd);
end

if you have an already customized link budget inputs/outputs, including availability will restore the link budget to its default inputs/outputs. a different dialog box opens up in this case where you can choose to either cancel or consent to the inclusion of itu-r p.618 propagation losses for availability analysis.

this figure shows the updates to the configuration in the link budget (tags n6, n7, and n8) and link (tag pl5) tabs, after the mat-files are added to the matlab path.

in this app, total atmospheric losses (tag n7) calculation with p.618 propagation model assumes the antenna type as parabolic.

add customized properties and results

add customized properties and results by following these steps.

this figure shows these updates in the properties and results tabs.

delete existing results

delete existing link analysis results by following these steps.

this figure shows these updates in the results tab.

add custom 2-d line plots

add customized 2-d line plots by following the steps in this example.

a new 2-d line plot tab opens up next to the budget analyzer toolstrip. this figure shows the new custom plot visible in the upper right corner of the app window, next to the default fspl plot.

you can directly modify all the tabs (name, x type, x axis, y type, y axis, and x range) that appear in the 2-d line plot contextual tab.

add custom 2-d contour plots

to add customized 2-d contour plots, follow the steps in this example.

a new 2-d contour plot tab for l2 appears next to the budget analyzer tab. this figure shows the new custom plots visible in the lower-right pane of the app window, next to the default margin - l2 plot.

you can directly modify all the fields (name, x type, x axis, y type, y axis, z type, z axis, x range and y range) that appear in the 2-d contour plot tab. to access these fields for l1, in the lower-right pane, select the received eb/no - l1 tab.

delete custom plots

to delete a custom plot, follow these steps.

visibility control for all plots

to control the visibility of any default or custom plot, select the specific plot from the drop-down list present in the plots section of the budget analyzer toolstrip.

by default, this app selects all plots and makes them visible. to hide any plot, clear it. reselect it to make it visible again.

if you modify the app layout, you can click the default layout button on the budget analyzer toolstrip to return to the default layout.

note that this app does not save the custom plots for a session.