Objectives Simulate RADAR system in MATLAB Determine range

Objectives • Simulate RADAR system in MATLAB. • Determine range and velocity of targets with reasonable accuracy. • Obtain accurate measurements in the presence of noise Abstract • Create a signal to transmit – A burst of Linear-FM chirps. So How Does It All Work? Results The radar transmitter sends out a burst signal which hits the target. The speed of the target shifts the signal according to the Doppler equation. The radar then receives the reflected signal. RANGE System measures time for the return signal to arrive. VELOCITY System measures Doppler shift. Range = 1/2 c Td Td = time delay Velocity = (fdc)/(2 fc) fc = frequency of radar fd = Doppler frequency shift • Successfully created transmitted and received signals. • Radar system accurately processed range and velocity of targets within 0. 40%. • Achieved accurate results with return signal equal to 1. 25 SNR Radar Processing Block Diagram • Simulate return signals by adding noise and Doppler shift. • Detect returned burst with Matched filter. • • • Utilize time delay in returned signal to determine range. Perform spectral analysis and use Doppler effect to calculate velocity. Transmit Burst Noise Conclusion Receive Burst Matched Filter • Error is acceptable for long range air traffic control systems. Range Index Window Burst • Refine parameters to improve range accuracy. FFT • Additional filtering could improve SNR. Process Range Create several targets and test system. Detect Frequency Shift Process Velocity Range Velocity Acknowledgements • C. Sidney Burrus [et al. ], Computer-Based Exercises for Signal Processing Using MATLAB, 1998 • L. Rabiner and B. Gold, Theory and Application of Digital Signal Processing, 1975 • Various websites including www. howstuffworks. com