VHF Radar Height-finding Research And Realization

VHF radar has great advantages in anti-stealth and anti-radiation missile. But, VHF radar has many disadvantages, such as wide beam width, low precision and low resolution ability. Especially in elevation dimension, the ability of height-finding precision of VHF radar is poor because of multi-path reflection. This thesis focuses on the study and implementation of altitude measurement in VHF radar. For the above problems, this paper introduces the basic principle of maximum likelihood and alternating projection algorithm, presents computer simulation of this algorithm in every situation, and validates the height-finding precision of this algorithm using real VHF radar echo. Besides, by simplifying the maximum likelihood alternating projection algorithm in the condition of single snapshot, a new simplified algorithm of maximum likelihood alternating projection is promoted to greatly reduce the amount of computation, increase the height-finding precision in low SNR condition and analyze the height measure precision when target's moving velocity is compensated. Combined with the project, a new design of height measure module is realized by using the new simplified algorithm of maximum likelihood alternating projection and the software is implemented by using high performance DSP (TS201) and FPGA. Test result in the project implementation is also presented.