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  • 1
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    An optimal GPS data processing technique (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A formula is derived to optimally combine dual-frequency GPS (Global Positioning System) pseudorange and carrier phase data streams into a single equivalent data stream, reducing the data volume and computing time in the filtering process for parameter estimation by a factor of four. The resulting single data stream is that of carrier phase measurements with both data noise and bias uncertainty strictly defined. With this analytical formula the single stream of equivalent GPS measurements can be efficiently formed by simple numerical calculations without any degradation in data strength. The formulation for the optimally combined GPS data and their covariances are given in closed form. Carrier phase ambiguity resolution, when feasible, is improved due to the preservation of the full data strength with the optimal data combining process.
    Keywords: COMMUNICATIONS AND RADAR
    Type: In: IEEE PLANS '92 - Position Location and Navigation Symposium, Monterey, CA, Mar. 24-27, 1992, Record (A93-10976 01-04); p. 21-26.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    ORION S-band data acquisition for S-Y calibration (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Error sources in the Operational Radio Interferometry Observing Network (ORION) are addressed. Specifically, the performance of the S-band receiver and the optimum allocation of data volume between S- and X-band observations is studied. It is found that the requirements on the S-band receiver are not very stringent. The system temperature of the ORION S-band receiver has a very small effect on baseline determination accuracy. It is unwise to pay a high cost for an S-band receiver with a low system temperature; a system temperature as high as 240 K is tolerable. Only 20 to 40 percent of data volume is to be allocated to S-band observations for minimum baseline error. The error remains low over a rather wide range of data volume ratio. Hence precise allocation of the 14 pairs of the Mark 3 very long base interferometer data channels between S- and X-band observations is not critical.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommun. and Data Acquisition Rept.; p 33-36
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Error estimation for ORION baseline vector determination (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Effects of error sources on Operational Radio Interferometry Observing Network (ORION) baseline vector determination are studied. Partial derivatives of delay observations with respect to each error source are formulated. Covariance analysis is performed to estimate the contribution of each error source to baseline vector error. System design parameters such as antenna sizes, system temperatures and provision for dual frequency operation are discussed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommun. and Data Acquisition Rept.; p 16-31
    Format: application/pdf
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