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Frequency hopping radar signal design and data processing method

Author: YangSiLiang
Tutor: WeiYinSheng
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Frequency hopping Sidelobe suppression SOCP Two-dimensional processing Speed ??super-resolution
CLC: TN957.51
Type: Master's thesis
Year: 2011
Downloads: 43
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Abstract


In this paper, frequency hopping pulse signal are discussed and research, respectively, signal design and signal processing from the perspective of a frequency-hopping signal low sidelobe implementation methods and speed of approach. In signal design, paper discusses the conditions given spectrum frequency-hopping signal low sidelobe design method - equal-area division method, gradient-based adaptive design methods, and genetic algorithms. From different angles of three methods to obtain the frequency hopping in order to achieve low sidelobe signals. Such area division method is a method based on the linear frequency modulation signal design improvements, this method relies on the selected form of the window function, although it can be a combination of the frequency becomes low sidelobe but not optimized, while the side lobe distribution uneven. Adaptive design method based on gradient through the maximum side lobe error to adjust each frequency to obtain low sidelobe frequency hopping signals and sidelobe evenly distributed, but thanks to the gradient algorithm, the initial value of the selected signal will lead to poor convergence at local extreme point. Genetic algorithms use of its advantages for solving combinatorial optimization problems by a given discrete spectrum, frequency optimization solution can be achieved, due to its discrete spectrum processing, usually so that the frequency converges to the vicinity of the optimal solution, so the combination of genetic algorithm initialization and gradient algorithm convergence, get the optimal frequency. From the signal processing point of view, in some cases as low sidelobe hopping signals can not be achieved by design, only by way of the signal processing to suppress the side lobes, such as random frequency hopping signals. On signal processing, the paper focuses on the perspective from the filter frequency hopping sidelobe suppression method is proposed based on SOCP sidelobe suppression filter design algorithms. The algorithm can achieve constant gain requirements under the sidelobe suppression filter design. Speed ??- from two-dimensional signal processing is an important process, apart from the side lobe suppression, the speed of the text of the FH signal processing method is also discussed. Studied the frequency-hopping signal processing speed of two commonly used methods: frequency-domain interpolation and speed direct alignment method. Target speed processing can also use extrapolation resolution interpolation algorithm processing, such as CG model based on the speed of super-resolution processing. Studies show that the method of super-resolution processing speed, have a good effect. In the two-dimensional hopping signal processing, the distance due to the coupling of the speed, so the text after the analysis of the signal processing speed of the coupling from the present speed based on the phase term, the coupling phase compensation discussed methods to achieve decoupling process . Then processed by the distance dimension: matched filtering and sidelobe suppression, to achieve two-dimensional echo signal processing.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Radar signal detection and processing
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