Extent of Observation Parameters in Space Surveillance by Radar

Kohlleppel, Robert

doi:10.23919/irs.2018.8448187

Cited by 11 publications

(3 citation statements)

References 3 publications

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“…However, applied naively they would result in a 10-dimensional ambiguity surface to search over. An improvement would be to work backwards from the orbital parameters of interest, as an object's orbit will largely constrain and define most of the other search parameters [27]. Incorporating orbital kinematics, even including highly eccentric orbits, will greatly reduce the subspace of possible values for other parameters, including range and Doppler migration factors, as well as pointing directions and their associated rates.…”

Section: Future Workmentioning

confidence: 99%

Improved Techniques for the Surveillance of the Near Earth Space Environment with the Murchison Widefield Array

Hennessy

Tingay

Hancock

et al. 2019

2019 IEEE Radar Conference (RadarConf)

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In this paper we demonstrate improved techniques to extend coherent processing intervals for passive radar processing, with the Murchison Widefield Array. Specifically, we apply a two stage linear range and Doppler migration compensation by utilising Keystone Formatting and a recent dechirping method. These methods are used to further demonstrate the potential for the surveillance of space with the Murchison Widefield Array using passive radar, by detecting objects orders of magnitude smaller than previous work. This paper also demonstrates how the linear Doppler migration methods can be extended to higher order compensation to further increase potential processing intervals.

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Section: Future Workmentioning

confidence: 99%

Improved Techniques for the Surveillance of the Near Earth Space Environment with the Murchison Widefield Array

Hennessy

Tingay

Hancock

et al. 2019

2019 IEEE Radar Conference (RadarConf)

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“…Here, the objective is to detect and track space debris with various sizes and ranges (corresponding to different orbital heights). It is straightforward to determine the maximal radial velocity a debris target can have based on a Kepler orbit model [19].…”

Section: Numerical Resultsmentioning

confidence: 99%

A Costas-Based Waveform for Local Range-Doppler Sidelobe Level Reduction

Neuberger

Vehmas

2021

IEEE Signal Process. Lett.

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Target masking due to high sidelobes in the range-Doppler domain is a common problem in radar signal processing. Masking occurs when there is large variation in targets' signal-tonoise-ratio levels, caused by differences in either range or radar cross section. In this letter, we consider the design of a waveform to reduce the masking of far range targets caused by near range targets. Our method is based on a time-frequency concatenation of a Costas sequence with shifted parts of itself. It allows the user to design a low sidelobe region in the range-Doppler domain. Moreover, it approximately preserves the desirable uniform sidelobe level and thumbtack behavior of the Costas ambiguity function. We demonstrate a 20 dB sidelobe level reduction within the desired region compared to a normal Costas code with the same bandwidth and pulse length.

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“…Usually, many radar detections are required to perform initial orbit determination. The mapping between radar measurement space and orbital parameters is an ongoing area of research [11].…”

Section: A Prior Workmentioning

confidence: 99%

Orbit Determination Before Detect: Orbital Parameter Matched Filtering for Uncued Detection

Hennessy¹,

Mark²,

Steven³

et al. 2020

Preprint

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This paper presents a novel algorithm to incorporate orbital parameters into radar ambiguity function expressions by extending the standard ambiguity function to match Keplerian two-body orbits. A coherent orbital matched-filter will maximise a radar's sensitivity to objects in orbit, as well as provide rapid initial orbit determination from a single detection. This paper then shows how uncued detection searches can be practically achieved by incorporating radar parameters into the orbital search-space, especially for circular orbits. Simulated results are compared to results obtained from ephemeris data, showing that the orbital path determined by the proposed method, and the associated radar parameters that would be observed, match those derived from the ephemeris data.

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Extent of Observation Parameters in Space Surveillance by Radar

Cited by 11 publications

References 3 publications

Improved Techniques for the Surveillance of the Near Earth Space Environment with the Murchison Widefield Array

Improved Techniques for the Surveillance of the Near Earth Space Environment with the Murchison Widefield Array

A Costas-Based Waveform for Local Range-Doppler Sidelobe Level Reduction

Orbit Determination Before Detect: Orbital Parameter Matched Filtering for Uncued Detection

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