Question about FMCW radar matlab code

We are trying to make a matlab code for post signal processing of FMCW radar . Can anyone give me code to post process after FMCW radar .. the output of radar is an IF signal and distance can be measured by checking the spike of IF signal as per the theory . ..

Answer 1

[Honglei Chen]

The following demo may be helpful

http://www.mathworks.com/help/phased/examples/automotive-adaptive-cruise-control-using-fmcw-technology.html

HTH

[Mohammad Mahbubur Rahman Khan Mamun]

Thanks Chen ..

Answer 2

[Amna Al Teneiji]

I have one question about FMCW radar example provided in Mathworks: http://www.mathworks.com/help/phased/examples/automotive-adaptive-cruise-control-using-fmcw-technology.html

I tried the simulation and I noticed something I don't understand it! They specify the range resolution 1m, so if the target lies at distances integer multiple of range resolution (for example: 1m, 2m, 3m,...) we get 1 peak corresponding to beat frequency. However, if the target lies at distances not integer multiple of range resolution (for axample: 1.5m,2.4m, ...) the result of the spectrum analyzer is two peaks corresponds to the two integer multiple distances that lies in between!! For example: if the target distance 1.5m: the two peaks are raised in 1m and 2m!! Could anyone explain why this is happens?!

Thanks.

[Honglei Chen]

This is because the radar does not sample continuously so it can only sample at certain distance. If you arrive between two sampled times, for radar, it is just like the arrival time is at a later time sample.

HTH

Answer 3

[Amna Al Teneiji]

Thanks Honglei Chen. I just wondering how to solve this issue. I tried to increase the sampling frequency as much as I can but it doesn't solve it. I tried several methods like zero padding, windowing and interpolation but with no improvement! How can I program it to sample continuously?

[Honglei Chen]

I'm not sure if you can completely eliminate it. You will have the same issue in reality as long as you use digital techniques.