Active-Passive Radar for Radar Imaging from Aerospace Carriers

Павликов, В. В.; Volosyuk, V. K.; Zhyla, Simeon; Tserne, Eduard; Shmatko, Olexandr; Sobkolov, Anton

doi:10.1109/eurocon52738.2021.9535619

Cited by 4 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Algorithm (15) implies the main operations of observation processing: the implementation of F FR V transformations for observations in all channels (the observation record in the form   i u t,r indicates that the signal in the i -th channel is "focused" on an elementary section of the underlying surface with the center at the end of the radius vector r . Such "focusing" is provided in decorrelated filters, and after their elimination is implemented in wideband phase shifters); multiplication of complex conjugate processes focused on the same area of the surface, after F FR V  -transformations in different channels; compensation of the interferometric factor, which naturally appears in the process of diagram formation in a rarefied antenna array (this operation is usually associated with aperture synthesis [49]); integration within the operating frequency band of the receiver and the addition of all output effects from different pairs of antennas.…”

Section:  mentioning

confidence: 99%

Radar imaging complex with SAR and ASR for aerospace vechicle

Павликов

Belousov²,

Zhyla

et al. 2021

reks

Self Cite

View full text Add to dashboard Cite

The subject of study in the article is the algorithms for radio monitoring of the Earth in a wide field of view from aerospace transport. The goal is to design a structural diagram of a radio complex that can operate simultaneously in two modes: modified synthetic aperture (SAR) and aperture synthesis (ASR), in accordance with algorithms synthesized by the maximum likelihood method. The modified SAR mode allows obtaining high-resolution radio images in the observation angle range ±(20°...50°) from the direction to the nadir. A method of combining a modified SAR algorithm is used, which differs from the classical imaging algorithm by the possibility of obtaining a higher spatial resolution, the payment for this is the complication of the signal processing algorithm associated with the implementation of decorrelating filters that expand the spectrum of received signals in each receiving path, and the ASR mode, which allows imaging using passive or active radar principles. The passive ASR mode provides for the imaging in the observation angle range of ±20° from the nadir based on the results of processing signals of its own broadband radio-thermal radiation, and the active mode – in the same observation angle range, but using the broadband noise signal of the backlight. An important result in the formation of a radio image in the specified viewing area when using the active mode of the ASR is that the images are close in physical content, namely, proportional to the specific effective reflection surface of the underlying surface. In addition, a distinctive feature of the synthesized algorithms is the use of wideband probing signals and, accordingly, the same input paths of receivers, which makes it possible to increase the signal-to-noise ratio of the output effect. Conclusions. The scientific novelty of the results obtained is as follows: a structural diagram of the radio complex was developed on the basis of algorithms synthesized by the maximum likelihood method. For the formation of a radio image in the radio complex, a combination of SAR and ASR (with two modes of operation) is implemented. This implementation is important, since it allows obtaining high-resolution images in the observation angle range of ±50° from the direction to the nadir. It is advisable to place the complex on airplanes, helicopters and spacecraft (preferably those that move in low orbits).

show abstract

Section:  mentioning

confidence: 99%

Radar imaging complex with SAR and ASR for aerospace vechicle

Павликов

Belousov²,

Zhyla

et al. 2021

reks

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, the creation of on-board radio complexes capable of obtaining the necessary information using stochastic signals is an urgent task today [25][26][27]. Radio complexes that will be placed on board the helicopter are no exception.…”

Section: Introductionmentioning

confidence: 99%

Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

et al. 2022

Self Cite

View full text Add to dashboard Cite

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.

show abstract