2001
DOI: 10.1109/19.903876
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Optical calibration phase locked loop for the Shuttle Radar Topography Mission

Abstract: The Shuttle Radar Topography Mission (SRTM) is an interferometric synthetic aperture radar system that flew on the space shuttle in February 2000. SRTM has an inboard antenna in the shuttle cargo bay and an outboard antenna at the end of a 60-m mast, extending from the cargo bay. In order to meet the elevation mapping accuracy requirement, the relative phase delay between the radar signals received via the outboard channel, compared with the inboard channel has to be known to within 8 at 5.3 GHz. This paper de… Show more

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Cited by 8 publications
(4 citation statements)
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“…The receivers were not identical mechanically or thermally, and the signal path length from receiving antenna to electronics was vastly different because of the 60‐m baseline. Rather than attempt to force the receiver phases to be identical, a calibration tone signal with common reference was distributed to the antennas over optical fiber cable to the deployed antenna [ McWatters et al , 2001]. The signals were injected into the receive paths at the antennas and detected in the data processing.…”
Section: Mission Designmentioning
confidence: 99%
“…The receivers were not identical mechanically or thermally, and the signal path length from receiving antenna to electronics was vastly different because of the 60‐m baseline. Rather than attempt to force the receiver phases to be identical, a calibration tone signal with common reference was distributed to the antennas over optical fiber cable to the deployed antenna [ McWatters et al , 2001]. The signals were injected into the receive paths at the antennas and detected in the data processing.…”
Section: Mission Designmentioning
confidence: 99%
“…The block diagram of the stabilized microwave fiber optic link can be showed in [2], and it is the first single mode optical fiber technology used in spaceborne application. More details can be found in [1] [2] [3]. The reference signal is transferred via the 60m long mast, and then serves as an internal calibration signal for the outboard receiving channel.…”
Section: A Sir-cmentioning
confidence: 99%
“…Phase difference measurement of sinusoidal signals [1,2,3,4,5,6,7,8,9] is one of the most important research topics in applications such as phase error calibration of the spaceborne single-pass interferometric synthetic aperture radar (InSAR) system [10,11,12,13], power system monitoring [14], radio frequency communication [15], and laser ranging [16]. For the spaceborne single-pass InSAR system, a possible interferometric phase error can arise from relative phase differences between the two receiver channels, because the two signal receivers are not identical mechanically or thermally, and the signal path length from receiving antenna to electronics is vastly different because of the 60 m baseline [12].…”
Section: Introductionmentioning
confidence: 99%
“…For the spaceborne single-pass InSAR system, a possible interferometric phase error can arise from relative phase differences between the two receiver channels, because the two signal receivers are not identical mechanically or thermally, and the signal path length from receiving antenna to electronics is vastly different because of the 60 m baseline [12]. Therefore, an internal calibration signal with common reference is distributed to the antennas over an optical fiber cable to the deployed antenna [10,11,12,13], and the phase difference of the internal calibration signals (usually sinusoidal signals) received separately from the primary and secondary antennas needs to be measured. More than that, the frequency of the calibration signal is generally high.…”
Section: Introductionmentioning
confidence: 99%