Analysis of distortions occurring during signal filtration with linear frequency modulation

Аuthors

Mukhtarov E. ^*, Petrov A. ^**

Lavochkin Research and Production Association, NPO Lavochkin, , Khimki, Moscow region, Russia

*e-mail: adgar.muhtarov@yandex.ru
**e-mail: aspetr50@mail.ru

Abstract

When processing a signal with linear frequency modulation obtained from radar equipment, there is an issue of undesirable distortion when compressing the signal using quasi-consistent filtration. These distortions occur due to minor deviations in the parameters of the signal's frequency change, which lead to a noticeable expansion of the response function. Such expansion, in turn, reduces the spatial resolution capabilities of the radar. In addition to the factors mentioned above, it is worth noting that during the transmission of the signal through the path, nonlinear distortions occur, which affect the amplitude-phase characteristics. These distortions, in turn, lead to a number of additional problems. One such problem is the appearance of multiple echo signals. As a result, false targets and noises may appear on the image, and image fragments may also be shifted. This article discusses issues related to the construction of a mathematical model and the development of algorithms for generating signals with linear frequency modulation. Special attention is given to the quasi-consistent filtration of these signals, taking into account the influence of nonlinear distortions in the pass-through information path. The theoretical concepts presented in works [1-5] are used to create these models, and issues related to the generation and quasi-consistent filtering of signals, considering nonlinear distortions that may occur in the information pathway, are also considered. In conclusion, graphic material is provided that demonstrates the results of numerical analysis of distortions that occur during the processing of signals with linear frequency modulation. Such analysis allows for a more detailed study and understanding of the nature and scale of distortions, as well as determining possible methods for their elimination and minimization. At the same time, this material is an important tool for further research and development in the field of signal processing.

Keywords:

signal with linear frequency modulation, matched filter, signal processing, paired echo signals

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