Design And Simulation On Acousto-optic Pulse Compression Laser Radar System

Compared with traditional microwave radar, Laser radar has obvious advantagesin aspects like imaging resolution for its higher operating frequency and shorterwavelength of the carrier wave. Therefore laser radar is more and more applied incivil and military fields such as ground sensing and remote sensing. However, due torestrictions of laser power and receiving sensitivity, there is a big gap between laserradar and traditional microwave radar in terms of operating range. Improvement ofoperating range has become hotspot in the field of laser radar. Among many methodsof improving operating range, pulse compression technique has great potential toimprove. Therefore, we demonstrated performance analysis and simulation on laserradar system based on surface acoustic wave pulse compression in this thesis.First, we analyzed characteristics on time-band width product of the laser radarsystem. It illustrates that pulse signal which has time-band width product can becompressed. We proposed principle and process on pulse compression of linear FMsignal emitted by laser radar. We obtained characteristics of linear FM laser radar byuse of pulse compression. The signal received by the receiver has narrower pulsewidth and higher peak power and can meet laser radar requirements of longer rangeand higher range resolution at the same time. Linear FM pulse laser radar systembased on acousto-optical pulse compression is designed according to principle ofpulse compression technique. Finally, we got target-range equation and relativerelation between target-range and noise by analyzing working process.Then, we simulated matched filtering on linear FM pulse compression laser radarusing of the principle of linear FM pulse compression laser radar. We obtained linearcorresponding relation between target range and output correlation peak. Thefeasibility of the ranging laser radar system based on acousto-optic correlator isproved. Therefore, it is proved that pulse compression technique can be used forimprovement on operating range of laser radar system.Finally, we studied signal process on linear FM pulse laser radar based onacousto-optical pulse compression. We perfected system design and simulation onpulse compression laser radar system. Therefore, We drawed the conclusion that the Signal Noise Ratio on laser radar system can be enhanced effectively by using pulsecompression technique. Simultaneously, system detect range is improved obviously.