Simulating a radar with transponder on the Flying vehcile

Hi I need help with the simulation of Transponder on the Flying Vehicle being interrogated from ground RADAR. Can this be done with Phased Array System Toolbox? If yes can you guide me further on this.

To explain transponder more further. I have a Flying Vehicle with transponder in it. Radar sends an interrogating signal which is received by transponder. On receiving the signals transponder responds back with a different frequency which is detected back at ground station. Since this is fresh source of signal it has dominant presence on the receivers than the reflected waves. (Any how they are at different frequencies.)

Answer 1

[Honglei Chen]

This should be doable with Phased Array System Toolbox. Basically, the ground radar has a transmitter (can be modeled by phased. Transmitter and phased Radiator) sends a signal to the receiver of flying vehicle (can be modeled by phased.Collector and phased.ReceiverPreamp). After the signal is received, you can do whatever the signal processing you need in MATLAB, including change frequencies. Once the signal is ready, you will simulate a transmitter at the vehicle side and then transmit it to the receiver of the radar.

HTH

[Anunay Sinha]

Hi I tried to implement the transponder in the way you described it above. I built it on top of mono static radar and am getting the peaks at my receiver as expected. (power of transponder is much higher as compared to the rest). But my problem is am getting the transponder signal before the return from the target. My transponder signal comes back exactly at half in time to what it takes for the target.

I am assuming its because two way propagation is false for my transponder. Can you suggest how i can ensure that my signal is emitted from the transponder once interrogating signal is received.

[Anunay Sinha]

I tried to mail you the code but its not going across.

[Honglei Chen]

Hi Anunay, sorry for the delay, I just saw it. I don't quite get the question. The signal from transponder should travel only one way so it should arrive about half in time compared to the target. Maybe I misunderstand your question? Do you have a code example I can look at? Thanks.

[Anunay Sinha]

Sorry for the delay on my side as well. Yes I get it that since communication is one way travel time should be half. But i want to simulate it in such a way that transponder starts sending signal only once it is triggered from a probing signal. So it is like I have radiator at the antenna which sends the signal out. This is received at the collector which is present on the target and on receiving the signal another radiator present on the target will send across radio wave in the direction of the ground antenna. Also initial signal which was coming towards the target gets reflected and travels back. So basically what I would like to see at the antenna is two peaks. One of the reflected signal from the target and one bigger peak of the fresh signal originating from the target. Also ideally the transponder signal will lag behind the reflected signal due the computation time that my equipment's will take.

I hope this clarifies it a little.

[Alex Antipin]

Hello all, I have the same task to model a secondary radar. Could you send me your code for this system, please?