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Implementation of the OFDM Chirp Waveform on MIMO SAR Systems
IEEE Transactions on Geoscience and Remote Sensing, 2015Attention has been devoted to multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) systems in recent years. The applications of MIMO SAR systems, which involve high-resolution wide-swath remote sensing, 3-D imaging, and multibaseline interferometry, are seriously limited by the available sets of orthogonal waveforms. Although orthogonal
Jie Wang 0018 +4 more
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Multitarget detection by stretch processing of chirp diversity waveforms
MILCOM 2016 - 2016 IEEE Military Communications Conference, 2016It is well-known that the use of stretch processing of FMCW pulses in multitarget scenarios results in the detection of false targets. The problem arises from the delay-Doppler coupling where the beat frequency cannot be attributed to a unique delay-Doppler pair.
Amro Lulu, Bijan G. Mobasseri
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A new chirp-coded radar waveform
Proceedings. ICCEA 2004. 2004 3rd International Conference on Computational Electromagnetics and Its Applications, 2004., 2005A new chirp-coded radar waveform (ICC-2) is introduced, relative to the old type intra-pulse chirp-coded (ICC-1) waveform described by Xu Qing (Syst. Eng. and Elect., vol.12, p.7-8, 2000). The waveform forming, ambiguity function and match filter output are discussed.
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Modified Chirp Waveforms in Cognitive UWB System
ICC Workshops - 2008 IEEE International Conference on Communications Workshops, 2008In this paper we propose a method to modify chirp waveforms in cognitive ultra wideband (UWB) system. By utilizing the time-frequency relationship of the chirp waveform, we can avoid the spectrum authorized to other existing systems. After estimating other applications in the electromagnetic environment, the adaptive waveform generation is adopted ...
H. Shen, W. Zhang, K. S. Kwak
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Multicode ultra-wideband scheme using chirp waveforms
IEEE Journal on Selected Areas in Communications, 2006We propose an ultra-wideband (UWB) scheme that employs chirp waveforms. Signals satisfying the Federal Communications Commission (FCC) requirements for UWB applications are formed by using multiple linear frequency-modulated (chirped) waveforms. This scheme has the merits of both the multiband orthogonal frequency-division multiplexing (OFDM) UWB ...
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MIMO SAR Chirp Modulation Diversity Waveform Design
IEEE Geoscience and Remote Sensing Letters, 2014Waveform diversity design is a vital issue in multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) systems because the waveforms should have good orthogonality, high coherence, and large time-bandwidth product. However, most of the existing waveforms are not suitable for MIMO SAR and difficult to be implemented in a real-life scene ...
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New radar waveform based on a chirp sequence
2014 International Radar Conference, 2014For all radar applications it is required to measure the target range R and radial velocity v r simultaneously and unambiguously with high accuracy and resolution even in multi target situations. In this paper, a new radar waveform is proposed, which is based on a chirp sequence.
Hermann Rohling, Matthias Kronauge
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Chirp Waveform Generation Using Digital Samples
IEEE Transactions on Aerospace and Electronic Systems, 1974This paper describes two methods of generating an analog frequency-modulated waveform by the use of a small number of digital samples of the ?chirp? waveform. The number of digital samples required is a function of the time-bandwidth product. For certain values of time-bandwidth product, this type of signal generation becomes extremely efficient ...
Rob Roy, O. Lowenschuss
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Stepped-Chirp Burst Waveform and SAR Imaging
2017The stepped-frequency signal is a kind of flexible high-range resolution waveform, it is sensitive to the radial velocity, and the couple between range and Doppler is very complicated. The target energy is distributed to the adjacent range cells, which results in the degradation of the range resolution and the loss of SNR.
Ruliang Yang +6 more
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Development and Comparison of DDS and Multi-DDS Chirp Waveform Generator
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019A synthetic aperture radar (SAR) is electromagnetic equipment which is composed of digital parts. It transmits and receives microwaves for observing long distance. In digital system, system clock is an important factor that determines waveform resolution. The SAR system is consist of FPGA, DAC, and other digital parts.
Kyeong-Rok Kim +5 more
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