Experimental Verification of a Doppler Velocity Measurement Method with Second-Time-Around Echo Suppression for Synthetic Bandwidth Radars

Kentaro ISODA; Teruyuki HARA

doi:10.1587/transcom.2016EBP3226

Experimental Verification of a Doppler Velocity Measurement Method with Second-Time-Around Echo Suppression for Synthetic Bandwidth Radars

Kentaro ISODA, Teruyuki HARA

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Range resolution is one of the metrics of radar performance. Synthetic bandwidth radar has been proposed for high-range-resolution. The transmitted frequency and down-conversion frequency of this type of radar are shifted by fixed amounts from pulse to pulse. Received signals are synthesized by taking IFFT for high-range-resolution. However, this type of radar has a problem with second-time-around echoes since multiple pulses are utilized. Moreover, a range shift occurs due to Doppler velocity. Thus second-time-around echo suppression and Doppler velocity compensation are required for accurate target range measurement. We show in this paper a Doppler velocity measurement method with second-time-around echo suppression for synthetic bandwidth radars. Our proposed method interleaves the transmission of ascending and descending frequency sequences. The Doppler velocity is measured by using a Fourier transform of the multiplication of the signals received using both sequences. The transmitted frequency difference of the adjacent pulses is wider than the bandwidth of the matched filter, so the second-time-around echoes are down-converted to the outside band of the matched filter and suppressed. We verify the principle of the proposed method using numerical simulations and experiments. The results show that second-time-around echoes were suppressed by 7.8dB, the Doppler velocity could be obtained and the range shift due to Doppler velocity was reduced by 7.37 times compared to the conventional SBR.

Publication: IEICE TRANSACTIONS on Communications Vol.E100-B No.10 pp.1968-1975

Publication Date: 2017/10/01

Publicized: 2017/03/15

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2016EBP3226

Type of Manuscript: PAPER

Category: Sensing

Authors

Kentaro ISODA
Mitsubishi Electric Corporation
Teruyuki HARA
Mitsubishi Electric Corporation

Keyword

synthetic bandwidth radar, synthetic high-range-resolution radar, stepped-frequency, Doppler velocity

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Kentaro ISODA, Teruyuki HARA, "Experimental Verification of a Doppler Velocity Measurement Method with Second-Time-Around Echo Suppression for Synthetic Bandwidth Radars" in IEICE TRANSACTIONS on Communications, vol. E100-B, no. 10, pp. 1968-1975, October 2017, doi: 10.1587/transcom.2016EBP3226.
Abstract: Range resolution is one of the metrics of radar performance. Synthetic bandwidth radar has been proposed for high-range-resolution. The transmitted frequency and down-conversion frequency of this type of radar are shifted by fixed amounts from pulse to pulse. Received signals are synthesized by taking IFFT for high-range-resolution. However, this type of radar has a problem with second-time-around echoes since multiple pulses are utilized. Moreover, a range shift occurs due to Doppler velocity. Thus second-time-around echo suppression and Doppler velocity compensation are required for accurate target range measurement. We show in this paper a Doppler velocity measurement method with second-time-around echo suppression for synthetic bandwidth radars. Our proposed method interleaves the transmission of ascending and descending frequency sequences. The Doppler velocity is measured by using a Fourier transform of the multiplication of the signals received using both sequences. The transmitted frequency difference of the adjacent pulses is wider than the bandwidth of the matched filter, so the second-time-around echoes are down-converted to the outside band of the matched filter and suppressed. We verify the principle of the proposed method using numerical simulations and experiments. The results show that second-time-around echoes were suppressed by 7.8dB, the Doppler velocity could be obtained and the range shift due to Doppler velocity was reduced by 7.37 times compared to the conventional SBR.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2016EBP3226/_p

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@ARTICLE{e100-b_10_1968,
author={Kentaro ISODA, Teruyuki HARA, },
journal={IEICE TRANSACTIONS on Communications},
title={Experimental Verification of a Doppler Velocity Measurement Method with Second-Time-Around Echo Suppression for Synthetic Bandwidth Radars},
year={2017},
volume={E100-B},
number={10},
pages={1968-1975},
abstract={Range resolution is one of the metrics of radar performance. Synthetic bandwidth radar has been proposed for high-range-resolution. The transmitted frequency and down-conversion frequency of this type of radar are shifted by fixed amounts from pulse to pulse. Received signals are synthesized by taking IFFT for high-range-resolution. However, this type of radar has a problem with second-time-around echoes since multiple pulses are utilized. Moreover, a range shift occurs due to Doppler velocity. Thus second-time-around echo suppression and Doppler velocity compensation are required for accurate target range measurement. We show in this paper a Doppler velocity measurement method with second-time-around echo suppression for synthetic bandwidth radars. Our proposed method interleaves the transmission of ascending and descending frequency sequences. The Doppler velocity is measured by using a Fourier transform of the multiplication of the signals received using both sequences. The transmitted frequency difference of the adjacent pulses is wider than the bandwidth of the matched filter, so the second-time-around echoes are down-converted to the outside band of the matched filter and suppressed. We verify the principle of the proposed method using numerical simulations and experiments. The results show that second-time-around echoes were suppressed by 7.8dB, the Doppler velocity could be obtained and the range shift due to Doppler velocity was reduced by 7.37 times compared to the conventional SBR.},
keywords={},
doi={10.1587/transcom.2016EBP3226},
ISSN={1745-1345},
month={October},}

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TY - JOUR
TI - Experimental Verification of a Doppler Velocity Measurement Method with Second-Time-Around Echo Suppression for Synthetic Bandwidth Radars
T2 - IEICE TRANSACTIONS on Communications
SP - 1968
EP - 1975
AU - Kentaro ISODA
AU - Teruyuki HARA
PY - 2017
DO - 10.1587/transcom.2016EBP3226
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E100-B
IS - 10
JA - IEICE TRANSACTIONS on Communications
Y1 - October 2017
AB - Range resolution is one of the metrics of radar performance. Synthetic bandwidth radar has been proposed for high-range-resolution. The transmitted frequency and down-conversion frequency of this type of radar are shifted by fixed amounts from pulse to pulse. Received signals are synthesized by taking IFFT for high-range-resolution. However, this type of radar has a problem with second-time-around echoes since multiple pulses are utilized. Moreover, a range shift occurs due to Doppler velocity. Thus second-time-around echo suppression and Doppler velocity compensation are required for accurate target range measurement. We show in this paper a Doppler velocity measurement method with second-time-around echo suppression for synthetic bandwidth radars. Our proposed method interleaves the transmission of ascending and descending frequency sequences. The Doppler velocity is measured by using a Fourier transform of the multiplication of the signals received using both sequences. The transmitted frequency difference of the adjacent pulses is wider than the bandwidth of the matched filter, so the second-time-around echoes are down-converted to the outside band of the matched filter and suppressed. We verify the principle of the proposed method using numerical simulations and experiments. The results show that second-time-around echoes were suppressed by 7.8dB, the Doppler velocity could be obtained and the range shift due to Doppler velocity was reduced by 7.37 times compared to the conventional SBR.
ER -