Improvement of radar's distance resolution and decryption of PN code

Distinguishing between adjacent targets is a major problem in radar system. Two targets located in the detection area of radar appear as one point on the radar screen if the distance between the two adjacent targets is less than the distance resolution of radar and the angle between these adjacent targets is less than the angle resolution of the radar. This paper discusses how to increase the distance resolution using the spread-spectrum signal with pseudo noise (PN) code. This code has good specifications in terms of achieving high compression of the pulse and good protection from interference. Another feature of PN code is its security property because the code cannot be easily decrypt and the only way to decrypt is discussed in this work. MATLAB is used as a simulation tool to evaluate the pulse compression of the received signal. It is also used to study the possibility of decryption the Pseudo-Noise (PN) code by illegal person.