Replace two-way propagation channel with two one-way propagation channels
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Hello,
I am using the Phased Array System Toolbox and I want to replace a two-way propagation channel by two one-way propagation channels, so I can add more signals to the receive path.
Why are the receive signals rxsig and yt not the same even though I am reusing the same radiator/collector?
Am I using the target relection in the correct way?
% Two-way channel
channel = phased.FreeSpace('PropagationSpeed',c,'OperatingFrequency',fc,'SampleRate',fs,'TwoWayPropagation',true);
% Two way propagation
sig = waveform(); % waveform
[~,txang] = rangeangle(tgtPos,radarParams.OriginPosition,radarParams.Orientation);
txsig = transmitter(sig); % transmit
txsig = radiator(txsig,txang); % radiate
txsig = channel(txsig,radarParams.OriginPosition,tgtPos,... % propagate in two-way channel
radarParams.OriginVelocity,tgtVel);
tgtsig = pointTgts(txsig,tgtAngs); % pointTgts of type phased.BackscatterRadarTarget
rxsig = collector(tgtsig,txang); % collect
rxsig = receiver(rxsig); % receive
% Two one-way channels
envout = phased.FreeSpace('TwoWayPropagation',false,'SampleRate', fs,'OperatingFrequency',fc,'PropagationSpeed',c);
envin = phased.FreeSpace('TwoWayPropagation',false,'SampleRate', fs,'OperatingFrequency',fc,'PropagationSpeed',c);
% One way propagation (from FrequencyAgilityExample)
xt = transmitter(sig); % transmit
xtarray = radiator(xt, txang); % radiate
yp = envout(xtarray,radarParams.OriginPosition,tgtPos,... % propagate
radarParams.OriginVelocity,tgtVel);
yr = pointTgts(yp,tgtAngs); % reflect
ye = envin(yr,tgtPos,radarParams.OriginPosition,... % propagate
tgtVel,radarParams.OriginVelocity);
yt = collector(ye,txang); % collect
yt = receiver(yt); % receive
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回答(1 个)
Honglei Chen
2019-2-26
This may have to do with your target location. The channel delays signal based on the distance. However, when the travel time is not a multiple of sampling time, then the signal arrives between the samples. In this case, a fractional delay filter is applied to the signal. Thus, when you change one two-way channel with two one-way channel, the signal may go through one more filter and therefore the result may be slightly different.
HTH
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