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  • Earth Resources and Remote Sensing  (6)
  • Aircraft Communications and Navigation  (1)
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  • 1
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    TOPEX/POSEIDON Microwave Radiometer (TMR): III. Wet Troposphere Range Correction Algorithm and Pre-Launch Error Budget (1993)
    In:  Other Sources
    Details
    Publikationsdatum: 2018-06-08
    Beschreibung: The sole mission function of the TOPEX/POSEIDON Microwave Radiometer (TMR) is to provide corrections for the altimeter range errors induced by the highly variable atmospheric water vapor content. The three TMR frequencies are shown to be near-optimum for measuring the vapor-induced path delay within an environment of variable cloud cover and variable sea surface flux background. After a review of the underlying physics relevant to the prediction of 5-40 GHz nadir-viewing microwave brightness temperatures, we describe the development of the statistical, iterative algorithm used for the TMR retrieval of path delay. Test simulations are presented which demonstrate the uniformity of algorithm performance over a range of cloud liquid and sea surface wind speed conditions...
    Schlagwort(e): Earth Resources and Remote Sensing
    Materialart: IEEE Transactions on Geoscience and Remote Sensing
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    TOPEX/Poseidon Microwave Radiometer (TMR): II. Antenna Pattern Correction and (1993)
    In:  Other Sources
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    Publikationsdatum: 2018-06-08
    Beschreibung: The calibrated antenna temperatures.
    Schlagwort(e): Earth Resources and Remote Sensing
    Materialart: IEEE Transactions on Geoscience and Remote Sensing
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    TOPEX/Poseidon Microwave Radiometer (TMR): 1. Instrument Description and Antenna Temperature Calibration (1993)
    In:  Other Sources
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    Publikationsdatum: 2018-06-08
    Beschreibung: The TOPEX/Poseidon Microwave Radiometer (TMR) is a 3-frequency radiometer flown on the TOPEX/Poseidon (T/P) satellite in low Earth orbit. It operates at 18, 21 and 37 GHz in a nadir only viewing direction which is co-aligned with the T/P radar altimeters. TMR monitors and corrects for the electrical path delay of the altimeter radar signal due to water vapor and non-precipitating liquid water in the atmosphere. This paper describes the TMR instrument and the radiometric instrument calibration required to derive antenna temperature (T_A) from the raw digital data. T_A precision of 0.4 K is predicted on orbit in all expected thermal environments. T_A accuracy of 0.5-0.6 K is expected following a post-launch field calibration campaign. When uncertainties related to antenna sidelobe corrections are included, this T_A accuracy yields a brightness temperature accuracy of 0.7- 0.8 K...
    Schlagwort(e): Earth Resources and Remote Sensing
    Materialart: IEEE Transactions on Geoscience and Remote Sensing
    Format: text
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  • 4
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    The Atmospheric Calibration System for Cassini Radio Science: part 1 (2001)
    In:  Other Sources
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Earth Resources and Remote Sensing
    Materialart: International Geoscience and Remote Sensing Symposium 2001; Sydney; Australia
    Format: text
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  • 5
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    WVR intercomparisons from the CART site Fall 2000 WVIOP (2001)
    In:  Other Sources
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    Publikationsdatum: 2018-06-08
    Beschreibung: The primary goal of this analysis is to assess the absolute accuracy of the WVR brightness temperature measurements and their interpretation in terms of the tropospheric water vapor burden (PWV).
    Schlagwort(e): Earth Resources and Remote Sensing
    Materialart: Fall 2000 WVIOP Science Team Meeting; Madison, WI; United States
    Format: text
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  • 6
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    The atmospheric calibration System for Cassini radio science: part 2 (2001)
    In:  Other Sources
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    Publikationsdatum: 2018-06-08
    Schlagwort(e): Earth Resources and Remote Sensing
    Materialart: IGARSS-2001; Sydney; Australia
    Format: text
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  • 7
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    Ground-Based GPS as a Calibration/Validation Tool for Tropospheric Sensing Instruments (1999)
    In:  Other Sources
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    Publikationsdatum: 2019-07-17
    Beschreibung: The tropospheric sensing capabilities of ground-based GPS have been the subject of intensive validation efforts in recent years. But a maturing GPS technology is now rapidly becoming a valuable calibration/validation tool in its own right. We will describe two applications where ground-based GPS receivers have been used as a calibration/validation tool. The first such case is the Cassini gravitational wave media calibration project. A water vapor radiometer (WVR) will calibrate the telemetry signal from the Cassini spacecraft for line-of-sight wet tropospheric fluctuations. The demanding mission specifications require that the WVR's retrieval of wet delay from measurements of brightness temperature be precisely calibrated. We will describe the results from a special campaign to calibrate the WVR's retrieval algorithm with GPS. The second case involves the Topex/Poseidon microwave radiometer (TMR) which is used to calibrate the altimetric measurement for the effect of tropospheric water vapor. Using GPS data from 1992 to 1997 we detected an anomalous drift in columnar water vapor measurements from the TMR. The TMR's spurious drift implies that the uncalibrated estimate of global mean sea level change from Topex/Poseidon is too low by approximately 1 mm/yr. We will discuss the challenges of using long-term time series and problems relating to using the global GPS network as a calibration tool.
    Schlagwort(e): Aircraft Communications and Navigation
    Format: text
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