MATLAB Answers

Longley Rice propagation model and reciprocity

조회 수: 3(최근 30일)
Joel Johnson
Joel Johnson 2021년 10월 9일
댓글: Joel Johnson 2021년 10월 14일
Code snippet below seems to show that MATLAB's Longley-Rice propagation model may not always be reciprocal - is this correct? Thanks!
close all; clear all;
% A test to show that the Matlab LR functions don't seem to be reciprocal
pm = propagationModel('longley-rice','AntennaPolarization','vertical');
freq = 469e6; % Tx freq (MHz)
S1 = [39.420200,-82.875300]; % Lat/Lon of Site 1
S2 = [39.413000,-82.896111]; % Lat/Lon of Site 2
s1ht = 1:50; % Antenna height @ site 1
s2ht = 2.08; % Antenna height @ site 2
% Link from S1 to S2
tx = txsite('Latitude',S1(1),'Longitude',S1(2),'AntennaHeight',s1ht,'TransmitterFrequency',freq);
rx = rxsite('Latitude',S2(1),'Longitude',S2(2),'AntennaHeight',s2ht);
PL1 = pathloss(pm,rx,tx);
% Now reverse the link
tx = txsite('Latitude',S2(1),'Longitude',S2(2),'AntennaHeight',s2ht,'TransmitterFrequency',freq);
rx = rxsite('Latitude',S1(1),'Longitude',S1(2),'AntennaHeight',s1ht);
PL2 = pathloss(pm,rx,tx);
plot(PL1,s1ht,'linewidth',2); set(gca,'Xdir','Reverse'); set(gca,'Fontsize',20); xlabel('Path loss (dB)'); ylabel('Tx Antenna height (m)')
hold on
grid on
plot(PL2,s1ht,'x','linewidth',2);
legend('S1 to S2','S2 to S1')
  댓글 수: 1
Joel Johnson
Joel Johnson 2021년 10월 9일
I subsequently noticed that there is no difference in the two in R2021b so probably this got fixed somewhere between R2018 and R2021.

댓글을 달려면 로그인하십시오.

채택된 답변

Tanmay Das
Tanmay Das 2021년 10월 14일
Hi,
As pointed out by Joel, the bug has been fixed in the future releases. So it is recommended to update the MATLAB version in order to leverage its full functionality.

추가 답변(0개)

제품


릴리스

R2018b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by