Experiments of Quasi-Orthogonal Linear Frequency Modulated Waveforms for Multibeam Radar

2020 IEEE International Radar Conference (RADAR)

2020

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Multibeam radars (MBRs) enable multiple independent channels by simultaneously exploiting spatial and waveform diversity. Orthogonal waveforms are employed to form multiple independent antenna beams, each one providing a different function and using different dedicated radar resources. This paper investigates sidelobe levels in MBRs and presents a comparison with those of an Electronic Steerable Array (ESA) that employs a single waveform in transmission to generate multiple simultaneous beams. Simulations are carried out for a 3-channel MBR transmitting quasi-orthogonal Linear Frequency Modulated (LFM) waveforms at Ku band. The response of the MBR to an ideal point target as a function of aspect angle as well as that to multiple targets in different locations has been investigated. Results corroborate the analytical findings and show that the sidelobe levels with respect to angle, at the target range, are attenuated by the cross-ambiguity function properties between the waveforms employed. The range response to a target in low channel isolation suffers from cross-channel interference that may alter the noise floor characteristics of the radar, hence stressing the importance of suitable waveform selection.

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Section: Introductionmentioning

confidence: 99%

Characterisation of Sidelobes for Multibeam Radar based on Quasi-Orthogonal LFM Waveforms

2020 IEEE International Radar Conference (RADAR)

2020

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“…In addition to common modes of operation, a multibeam radar (MBR) with collocated antennas can be devised as well. This type of radar uses an orthogonal waveform for each of its beams to form separate radar channels with different properties [5], [6]. A linear combination of orthogonal waveforms is transmitted for each channel.…”

Section: Introductionmentioning

confidence: 99%

Numerical Characterisation of Quasi-Orthogonal Piecewise Linear Frequency Modulated Waveforms

2019 Sensor Signal Processing for Defence Conference (SSPD)

2019

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This paper presents an analysis of the Doppler tolerance and isolation properties of five different sets of piecewise linear frequency modulated (PLFM) waveform triplets consisting of a combination of LFM subchirps. Different combinations of PLFM signals are used to produce waveforms with the same timebandwidth product and optimise them with respect to isolation. The performance of the proposed waveforms are numerically investigated and a comparison between sets is presented. Results confirm that the waveforms have quasi-orthogonal properties and exhibit a degree of Doppler tolerance.

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Micro-Doppler Signature Extraction with Multibeam Radar

2019 International Radar Conference (RADAR)

2019