Lpi Radar One-dimensional Imaging Study

Radar is an electronic device which was used to find goals and detect distance, direction and movement of targets. La the national defense, radar as a modern "telescope" is an indispensable modern military electronics and information equipment, which undertakes early warning detection of incoming enemy targets, targets tracking and identification of threat targets, guidance of its own interceptor, tracking and guidance of the interceptor weapons and other important tasks. In the war, in order to evade radar detection, there has been constant confrontation radar study of the various measures, such as the active and passive radar interference, low-entry, anti-radiation missile attacks, stealth, etc. So the application of the modern ESM (Electronic Support Measure) and RWR (Radar Warning Receiver) posed a serious threat to radar survival. Low Probability of Intercept (LPI) radar, born with the development of electronic countermeasures, is the comprehensive embodiment of anti-jamming technology, anti-reconnaissance technology and anti-destroying technology.Radar imaging technology refers to the technology of the use of the electromagnetic scattering signal to acquire the information of the accurate geometric shape and structural features of targets. Radar imaging technology extends its functions from target detection and tracking to imaging and identification.One-dimensional range profile is the earliest radar imaging technology. When the radar transmits and receives narrow pulse or broadband signals, the radial range resolution is much smaller than the target size, the target can be modeled into their own independent scattering centers set, the amplitude distribution of those scattering centers on the radar radial distance is known as the one-dimensional range profile. When the range resolution is high enough, one-dimensional range profile depicts the scattering properties of the target, and reflects the precision geometry and structural characteristic, and can be used for target identification, and possesses the vital military significance and practical value to improve the defense and warning capability, survivability, effective retaliatory capability of the radar components, as well as for the sea and air superiority in a future war.Based on the method of LFM radar signal processing and the related research results of DSP Implementation, and the actual needs of radar systems, this thesis involves the algorithm study, simulation, emulation and implementation of one-dimension range profile.The main research work and results can be summarized as follows:1). Algorithm study. To simplify the algorithm and save processing time, a new method of dechirping is proposed.2). Algorithm emulation. To validate the algorithm, algorithm emulation is accomplished by MATLAB software.3). Algorithm realization. Using the correlated digital signal processing module developed by our project team as the hardware platform, this paper realizes the imaging arithmetic of range profile with assembly language. The results of software simulation and hardware debugging indicate that the work is effective and coincident with the system's demand.The research results indicate that the range profile is coincident with the radar system's demand in function. And the main parameters gained by test reach the radar system's design demand.