Longley Rice propagation model and reciprocity

3 次查看（过去 30 天）
Joel Johnson
Joel Johnson 2021-10-9
评论： Joel Johnson 2021-10-14
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')
  1 个评论
Joel Johnson
Joel Johnson 2021-10-9
I subsequently noticed that there is no difference in the two in R2021b so probably this got fixed somewhere between R2018 and R2021.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Tanmay Das
Tanmay Das 2021-10-14
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.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Propagation and Channel Models 的更多信息

标签

产品


版本

R2018b

Community Treasure Hunt

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

Start Hunting!

Translated by