Implementation of Compressed Wave Pulsed Radar Altimeter in Signal Processing

Madhupriya, G.; Lavanya, K.; Vennisa, V.; Raajan, N. R.

doi:10.1109/iccci.2019.8821863

Cited by 2 publications

(4 citation statements)

References 4 publications

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“…It should also be noted that the obtained structure of the radar, with the exception of the use of broadband stochastic probing signals and the corresponding high-frequency paths, largely corresponds both to the theory of other authors [14], and to the existing serial samples of airborne altimeters [29,30].…”

Section: Discussionmentioning

confidence: 59%

“…In this work we write the natural logarithm of the likelihood function in the following form: (15) where k t d → r is a coefficient, the derivative of which depends on the information parameter; W u t 1 , t 2 , t d → r is a function, which is the inverse of the correlation function (14) and is found from the solution of the inversion equation…”

Section: Methodsmentioning

confidence: 99%

“…For example, laser radiation is used and processed in lidar systems [5][6][7], there are also systems that use telecommunication signals [8,9], nonlinear algorithms for a movement trajectory processing [10][11][12], etc. Traditionally, the most reliable are radio altimeters [13][14][15], which work in the radio range of waves, which allows one to receive the necessary information regardless of the current time of day, weather conditions, and are completely autonomous. Such systems can be implemented according to different schemes, but they all have some common features, such as the use of pulsed or continuous deterministic narrowband probing signals, which limits their potential technical characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

et al. 2022

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Radio altimeters are an important component of modern helicopter on-board systems. These devices currently involve the use of narrowband deterministic signals, that limits their potential technical characteristics. Given the significant breakthrough in the development of wideband and ultra-wideband radio electronics, it is promising to create on-board radio complexes capable of obtaining the necessary information using wideband stochastic signals. At the same time, when developing such complexes, it is important to use optimal synthesis methods for radio systems, which will allow optimal signal processing algorithms and potential accuracy parameters to be obtained. In this work, the algorithm to measure flight altitude for a helicopter or an unmanned aerial vehicle based on the processing of wideband and ultra-wideband pulsed stochastic signals is synthesized for the first time by the maximum-likelihood method. When formulating the problem, the mathematical model of the signal and observation is specified, and their statistical characteristics are investigated. The peculiarity of the synthesis task is the use of a noise pulse transmitter, which implements the function of an underlying surface illuminator, as well as considering the signal structure destruction during its radiation, propagation, and reflection. This signal shape destruction makes it impossible to synthesize a radar with internally coherent processing when working on one receiving antenna. In accordance with the synthesized algorithm, a simulation model of a pulsed radar with a stochastic probing signal has been developed and the results of its modeling are presented.

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Section: Discussionmentioning

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

et al. 2022

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“…На сьогодні проєктувальники та розробники пропонують різноманітні методи вимірювання висоти від лідарів [1][2][3], заснованих на використанні і обробленні лазерного випромінювання, до використання телекомунікаційних сигналів [4,5] та непрямих методів розрахунків з застосуванням нечіткої логіки [6] і нелінійних алгоритмів оброблення траєкторій руху [7]. Але традиційно найбільш надійними та незалежними від часу доби і метеоумов є радіовисотоміри [8][9][10], які працюють у радіодіапазоні  В. К. Волосюк, В. В. Павліков, С. С. Жила, Е. О. Церне, О. В. Одокієнко, А. П. Дьомін, А. М. Гуменний, А. В. Попов, 2022 хвиль. Такі висотоміри можуть будуватися за різними схемами, але їм притаманні наступні риси: використання неперервних або імпульсних сигналів; використання вузькосмугових детермінованих сигналів.…”

Section: вступunclassified

Алгоритм Обробки Сигналів Для Вертолітного Широкосмугового Шумового Некогерентного Радіовисотоміру

Volosyuk¹,

Павликов²,

Zhyla³

et al. 2022

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The algorithm for a helicopter or an unmanned aerial vehicle flight altitude measuring based on the processing of broadband and ultra-wideband pulsed stochastic signals has been synthesized for the first time by the maximum likelihood method. When formulating the initial data, mathematical models of the probing signal and the received observation are given, taking into account both various options for input path implementation, which impose restrictions on the observation equation form, and the geometry of the problem. When solving the problem, the statistical characteristics of the given models were found and studied. The calculated observation correlation function contains information about both the signal delay time and the radio pulse envelope, which makes it possible to obtain the algorithm for desired altitude parameter determining by one of two ways: differentiating the likelihood functional by the delay time or by the radio pulse envelope. At the same time, for the first time, the inversion equation for the statistical characteristics of the studied non-stationary processes in the frequency domain has been obtained. Such processes arise due to the presence of a radio pulse envelope. An important feature of the solved synthesis problem is a noise pulse transmitter use that implements the function of the underlying surface sounding, as well as taking into account the fact of the signal structure destruction during its radiation, propagation and reflection. Such a destruction of the signal shape doesn’t make it impossible to synthesize a radar with internal coherent processing algorithms when working on one receiving antenna and requires the search for other signal processing options. The use of a non-deterministic signal in the system also complicates the formalization of the delay time parameter in the likelihood function, since in this case the reference signal cannot be represented as a model or an analytical equation. Following the synthesized algorithm, a simulation model of a pulsed radar with a stochastic probing signal has developed and the results of its modeling are presented. The obtained output effect of the system fully corresponds to the classical theoretical calculations.

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Implementation of Compressed Wave Pulsed Radar Altimeter in Signal Processing

Cited by 2 publications

References 4 publications

Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

Алгоритм Обробки Сигналів Для Вертолітного Широкосмугового Шумового Некогерентного Радіовисотоміру

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