Engineering Implementation And Position Adaptability Study Of Altitude Measurement Method For VHF Radar

The low elevation angle measurement problem of VHF radar has always been a hot spot in radar technology research.So far,many scholars have proposed a variety of more practical VHF radar altimetry algorithms.However,the existing algorithms have certain limitations.For the time being,there is no altimetry algorithm that is easy to implement and can maintain high precision under any position conditions.Therefore,in the VHF radar altimetry design and engineering implementation,making full use of the characteristics of existing algorithms to make the complementary advantages of different algorithms is one of the most effective ways to improve the VHF radar altimetry capability.This paper combines a VHF radar project,studies the VHF radar altimetry method and its position adaptability,designs the VHF radar altimetry scheme,and implements the project.The main points of this paper are sum up as follows:1.The basic theory of VHF radar altimetry technology is introduced.Firstly,the classical multipath model and the spherical multipath model are introduced.Then,the four commonly used VHF radar altimetry algorithms,such as digital beamforming algorithm,alternating projection maximum likelihood algorithm,lobe splitting method and synthetic steering vector maximum likelihood algorithm,are introduced.The basic principles of these algorithms use the results of computer simulation and measured data processing to analyze the characteristics of these algorithms,and to explore the position adaptability and adaptation methods of these algorithms.2.The altitude measurement plan of an actual project of a VHF radar is studied.The angular accuracy of several altimetry methods is compared by performance simulation.After considering the influence of terrain,system error and other factors on the altimetry algorithm,determine the altimetry scheme of the meter wave radar and design a series of altimetry parameter tables.3.The engineering implementation method of altitude measurement module is studied.Firstly,the architecture of signal processing platform is introduced.The General-Purpose Processor architecture is adopted in signal processing platform,which can be used for program development in high-level programming languages such as C++.The running environment of the program and the selected development tools are briefly introduced.Using the high-performance matrix operation function provided by Array Fire function library,all kinds of altitude measurement algorithms can be easily and quickly realized.Then,Then the overall process and various parts of the altitude measurement module are described in detail.Finally,the simulation test of each altitude measurement algorithm in the module is carried out.According to the operation of the test program,the rationality of the module design is preliminarily verified.