MATLAB | SUMMER 2012

Center Of Airborne Systems, DRDO

#### Plot the visibility and probability detection diagrams, and maximize the probability of detection of the radar system in a simulation environment.

**WORKFLOW**

In this project, I basically aimed to plot the visibility and probability of detection diagrams, and maximize the probability of detection of the radar system in a simulation environment. The visibility diagrams were plotted for 10 different PRF sets. The simulation was created on MATLAB. Various parameters like Range Resolution were manipulated were varied in the simulation so as to obtain maximum visibility. The major part of the project involved the removal of range and Doppler blinds, again to maximize detection probability. The illustration above is the graph plotted in this project.

**Blind Ranges**

When the same antenna is used for high power transmitting and receiving, the radar receiver must be turned off during transmission. The receiver off time must be long enough for the transmitter energy to decay to levels that do not harm the receiver and a therefore longer the 3 db transmitter pulse width. The result of blind range is “a range corresponding to the time delay of an integral multiple of the interpulse period plus a time less than or equal to the transmitted pulse length. A radar usually cannot detect targets at a blind range because of the interference by subsequent transmitted pulses”. The problem of blind ranges can be solved or largely mitigated by employing multiple PRF’s.

**Doppler Shift**

Doppler shift is the shift in frequency between the transmitted radio frequency carrier and the echoes reflected from the moving objects. The Doppler shift observed in positive if the target is approaching and negative if the target is receding.