# How to calculate resolution of radar?

I am working of FMCW radar. Below are all the parameters of FMCW radar. How can I Calculate the resolution of my radar

Parameters            Values
Center frequency (fc)     70GHz
Bandwidth (BW)            40 GHz
Sampling frequency (fs)   10 MHz
Sweep time            0.2 ms
Number of periods    10 period


The range resolution is normally some fraction bandwidth of the pulse. The fraction will depend on how you measure it i.e. null to null, 3dB points, 6 dB points etc. Also the windowing (Hamming, Kaiser) used will reduce the resolution i.e. increase the number. For a chirp pulse with the bandwidth you stated the null to null width is given by

$$\delta r = \frac{c}{2BW}=\frac{3\cdot 10^8}{2\cdot 40\cdot 10^9 }=3.75 \cdot 10^{-3} \textrm{ m }$$

You can reference the following links:

• That 'e' has to be changed to 10. Aug 18, 2015 at 13:38

It's not clear from your question, but there's also angular resolution, or the width of the mainlobe of your radar. This can sometimes be referred to as cross range resolution, and there are many approximations you can use based on the type of radiator you're using.

There's also sampling resolution, which is similarly calculated as the range resolution, but defines the spacing between samples. Whereas the range resolution defines the minimum detection distance between two point targets.