High range resolution by means of synthetic bandwidth generated by frequency-stepped chirps

Schimpf, Hartmut; Wahlen, Alfred; Essen, H.

doi:10.1049/el:20030829

Cited by 58 publications

(23 citation statements)

References 4 publications

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“…Step-chirped microwave pulses have also been widely used in modern radar for its high range resolution without imposing large instantaneous bandwidth on the radar system [14]. Again, an 80 GHz MMW burst sinusoidal waveform (not shown) is first generated by reducing the spectral period to ∼0.74 nm in combination with a 1-km-long SMF.…”

Section: Resultsmentioning

confidence: 99%

Photonic Generation and Detection of W-Band Chirped Millimeter-Wave Pulses for Radar

Lin

Chuang

et al. 2012

IEEE Photon. Technol. Lett.

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Based on the frequency-to-time mapping approach, we generate frequency-modulated millimeter-wave (MMW) pulses with central frequencies up to the W-band by a shaped optical pulse excitation of an MMW photonic transmitter with an ultrawide band photodiode as its key component. A coherent detection is achieved via a terahertz time-domain spectroscopic setup. Two different kinds of chirped MMW waveforms are generated; one is a linearly chirped sinusoidal pulse and the other is produced by a frequency-stepped modulation. Through appropriate optical spectral design, the frequency-chirped MMW pulses with instantaneous frequencies sweeping from 120 to 60 GHz, and a time-bandwidth product of ∼25 is experimentally demonstrated.Index Terms-Millimeter wave (MMW), photonic transmitter (PT), pulse shaping, terahertz (THz).

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Section: Resultsmentioning

confidence: 99%

Photonic Generation and Detection of W-Band Chirped Millimeter-Wave Pulses for Radar

Lin

Chuang

et al. 2012

IEEE Photon. Technol. Lett.

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“…Schimpf, et al, 5 describe a short-range millimeter-wave SAR system that uses segmented LFM waveforms for the purpose of limiting chirp rate in spite of extremely short pulses used. No mention of phased array beam steering issues are made.…”

Section: Prior Artmentioning

confidence: 99%

SAR processing with stepped chirps and phased array antennas.

Doerry¹

2006

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Wideband radar signals are problematic for phased array antennas. Wideband radar signals can be generated from series or groups of narrow-band signals centered at different frequencies. An equivalent wideband LFM chirp can be assembled from lesserbandwidth chirp segments in the data processing. The chirp segments can be transmitted as separate narrow-band pulses, each with their own steering phase operation. This overcomes the problematic dilemma of steering wideband chirps with phase shifters alone, that is, without true time-delay elements.-3 - ACKNOWLEDGEMENTS

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“…In order to get the equivalent range resolution, very wide bandwidth pulses need to be transmitted and received, which will make the receiving and sampling very difficult for the A/D devices. There are two solutions to conquer this difficulty: the first one is to transmit narrow bandwidth stepped chirps [4][5][6]. The second is the dechirp-receiving method [1].…”

Section: Introductionmentioning

confidence: 99%

An Extended Frequency Scaling Algorithm for High Squint Spotlight Airborne Sar

Zuo¹,

Pi²,

Min³

2013

PIER

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Abstract-In high squint spotlight mode SAR, the coupling of the range and azimuth is very serious, which brings challenges to the imaging. In this paper, an extended frequency scaling algorithm is proposed, in which the range migration correction is divided into two steps. Firstly the range walk correction is implemented in 2D time domain. In the second step, the residual range migration is corrected by the frequency scaling and bulk shift operations. Though the second range compression does not consider the range space variance, the range compression is precise. In the azimuth compression, because of the range walk correction, the azimuth modulation frequency rate becomes dependent on the azimuth position. In order to equalize the azimuth modulation frequency rate, the azimuth nonlinear chirp scaling method is involved to remove the dependence. The simulation experiments verify the validity of the proposed algorithm. The comparison of the imaging quality among traditional frequency scaling algorithm, nonlinear frequency scaling algorithm and the proposed method indicates the proposed method is more suitable for the high squint spotlight SAR.

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High range resolution by means of synthetic bandwidth generated by frequency-stepped chirps

Cited by 58 publications

References 4 publications

Photonic Generation and Detection of W-Band Chirped Millimeter-Wave Pulses for Radar

Photonic Generation and Detection of W-Band Chirped Millimeter-Wave Pulses for Radar

SAR processing with stepped chirps and phased array antennas.

An Extended Frequency Scaling Algorithm for High Squint Spotlight Airborne Sar

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