An efficient method of doppler parameter estimation in the time-frequency domain for a moving object from TerraSAR-X data

Jeong Won Park, Joong Sun Won

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

A method measuring Doppler parameters by joint time-frequency analysis is presented. Two-dimensional velocity retrieval can be achieved by estimation of the Doppler center frequency and Doppler frequency rate for the range and azimuth velocity components, respectively. The Doppler spectrum along a Doppler phase history line in the time-frequency domain was reconstructed and projected onto the frequency and time dimensions. The peak of the frequency axis projected spectrum corresponds to the Doppler center frequency, while that of the time axis indicates an azimuth time of closest approach. The Doppler frequency rate is obtained by measuring the slope of the Doppler spectrum in the time-frequency domain. Simulation using TerraSAR-X and Envisat ASAR parameters indicated that the velocity errors were less than 1 m/s or 5% for moving objects with a velocity higher than 3 m/s. While the measurement of Doppler center frequency was reliable over the entire velocity range, errors in Doppler frequency rate became large if the velocity was slower than 3 m/s (or 10.8 km/h). Range migration correction plays a key role for the precision of Doppler parameter estimation. An experiment using TerraSAR-X and truck-mounted corner reflectors validated the measurement accuracy of the approach. The absolute and percent errors of the range velocity (49.6 km/h) were 1.4 km/h and 2.8%, respectively, and the azimuth velocity (23.8 km/h) measurement was comparatively accurate, with a percent error of 1.8% under an assumption of zero acceleration. To apply the method to single-look complex data, the full Doppler bandwidth must be preserved.

Original languageEnglish
Article number6018298
Pages (from-to)4771-4787
Number of pages17
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume49
Issue number12 PART 1
DOIs
Publication statusPublished - 2011 Dec

Bibliographical note

Funding Information:
Manuscript received November 1, 2010; revised February 19, 2011 and June 6, 2011; accepted July 10, 2011. Date of publication September 14, 2011; date of current version November 23, 2011. This work was supported by the National Space Lab program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science, and Technology (M105DA000004-08D0100-0011A). The TerraSAR-X data were provided to J.-S. Won as a TerraSAR-X Science Team Project (PI No. COA0047).

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Earth and Planetary Sciences(all)

Fingerprint

Dive into the research topics of 'An efficient method of doppler parameter estimation in the time-frequency domain for a moving object from TerraSAR-X data'. Together they form a unique fingerprint.

Cite this