Improvement in SNR of signal detection using filtering in pulsar-based navigation systems

Kabakchiev, Christo; Behar, V.; Buist, Peter J.; Garvanov, Ivan; Kabakchieva, Dorina; Bentum, Mark J.; Fernandes, Jorge Henrique Cabral

doi:10.23919/irs.2017.8008258

Cited by 6 publications

(13 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our previous paper [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ] used digital records of the signals obtained in the radio telescopes at the Dwingeloo and Westerbork observatories, which observe the pulsar B0329+54, for experimentally evaluating the accuracy of the TOA (time delay of the accumulated pulsar signal relative to the pulsar reference signal, i.e., template).…”

Section: Navigation With Pulsar Radio Signalsmentioning

confidence: 99%

“…In 2013, within the European project under the 7th Framework Program “Pulsar Plane” the issues of creating an aviation radio navigation system working with signals from radio pulsars were investigated [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. As a result of the work on the project, experimental [ 23 ] and theoretical [ 26 , 27 ] estimates of the accuracy of the time of delay (TOA) of signals obtained by different methods have been obtained.…”

Section: Overview Of Potential Navigational Accuracy By Using Pulsar ...mentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Accuracy of TOA and SNR of Radio Pulsar Signals for Vehicles Navigation

Kabakchiev

Behar

Kabakchieva

et al. 2023

Sensors

Self Cite

View full text Add to dashboard Cite

It is known that X-ray and gamma-ray pulsars can only be observed by spacecraft because signals from these pulsars are impossible to be detected on the Earth’s surface due to their strong absorption by the Earth’s atmosphere. The article is devoted to the theoretical aspects regarding the development of an autonomous radio navigation system for transport with a small receiving antenna, using radio signals from pulsars, similar to navigation systems for space navigation. Like GNSS systems (X-ray and radio), they use signals from four suitable pulsars to position the object. These radio pulsars (out of 50) are not uniformly distributed but are grouped in certain directions (at least 6 clusters can be determined). When using small antennas (with an area of up to tens of square meters) for pulsar navigation, the energy of the pulsar signals received within a few minutes is extremely insufficient to obtain the required level of SNR at the output of the receiver to form TOA estimation, ensuring positioning accuracy up to tens of kilometers. This is one of the scientific tasks that is solved in the paper by studying the relationship between the SNR of the receiver output, which depends on the size of the antenna, the type of signal processing, and the magnitude of the TOA accuracy estimate. The second scientific task that is solved in the paper is the adaptation of all the possible approaches and algorithms suggested in the statistical theory of radars in the suggested signal algorithm for antenna processing and to evaluate the parameters of the TOA and DS pulsar signals, in order to increase the SNR ratio at the receiver output, while preserving the dimensions of the antenna. In this paper, the functional structure of signal processing in a pulsar transport navigation system is proposed, and the choice of the observed second and millisecond pulsars for obtaining a more accurate TOA estimate is discussed. The proposed estimates of positioning accuracy (TOA only, no phase) in an autonomous pulsar vehicle navigation system would only be suitable for the navigation of large vehicles (sea, air, or land) that do not require accurate navigation at sea, air, or desert. Large-sized antennas with an area of tens of square meters to hundreds of square meters can be installed in such vehicles.

show abstract

Section: Navigation With Pulsar Radio Signalsmentioning

confidence: 99%

Section: Overview Of Potential Navigational Accuracy By Using Pulsar ...mentioning

confidence: 99%

Investigation of Accuracy of TOA and SNR of Radio Pulsar Signals for Vehicles Navigation

Kabakchiev

Behar

Kabakchieva

et al. 2023

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the last ten years, there has been a particular interest in these bistatic FSR systems, since they practically allow to observe such targets (Stealth technology), which are invisible by conventional radar systems [ 12 , 13 , 14 ]. The practical use of FSR systems goes together with bistatic radar systems.…”

Section: Introductionmentioning

confidence: 99%

“…The standard algorithm for processing of pulsar signals implemented in the radio telescopes usually includes signal accumulation. The signal processing algorithm for detection of pulsar signals that use the filtering approach is described in [ 13 ]. The other cyclostationary approach is presented in [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

FSR Systems for Detection of Air Objects Using Cosmic Radio Emissions

Kabakchiev

Behar

Garvanov

et al. 2021

Sensors

Self Cite

View full text Add to dashboard Cite

The paper analyses the possibility of Forward Scatter Radar (FSR) systems to detect airplanes using cosmic emission from pulsars and planets (pulsar, Sun, Moon). A suboptimal multichannel algorithm for joint detection and evaluation of the parameters of the forward scattering signal created by an airplane (duration and velocity) is proposed, with preliminary compensation of the powerful direct signal emitted by cosmic sources (pulsar, Sun and Moon). The expressions for calculation of the Signal-to-Noise Ratio (SNR) at the input of the detector and the compensator are obtained. The detection characteristics are also obtained, and the requirements for the suppression coefficient of the compensator are evaluated. A methodology for calculating the maximum distance for detecting an aircraft using a described algorithm is proposed. The obtained results show that due to the Forward Scatter (FS) effect, there is the theoretical possibility to detect airplanes at close ranges by FSRs, which use very weak signals from cosmic sources.

show abstract