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- W343366601 abstract "Abstract : Progress has been made in inertial surveying by the Position and Azimuth Determining System (PADS) developed by Litton Systems, Inc. for the U.S. Army Engineer Topographic Lab (ETL). Following installation of an improved vertical accelerometer and other modifications, the PADS has been renamed Inertial Positioning System (IPS). The IPS, with some software changes as to gyro error control has served as the Rapid Grtavity Survey System (RGSS) for ETL. The present RGSS operates as a quasi-local level system and permits Kalman stochastic error control using observed velocity errors at vehicle stops. A new optimal data reduction method for estimating the deflections of the vertical is presented. The method requires RGSS horizontal velocity errors at each stop and the inertial system real-time kalman filter update gains. Storage of real-time covariance data is not necessary. Survey transverse inital and terminal astro-geodetic deflections are used along with terminal platform azimuth error observation to estimate approximate gyro biases. The error models used preserve the inertial system dual horizontal interaction and exploits statistical collocation techniques to preserve correlations between the two components of the deflection of the vertical which are least squares estimated using all data simultaneously." @default.
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- W343366601 date "1985-01-01" @default.
- W343366601 modified "2023-09-24" @default.
- W343366601 title "Improved Determinations of Deflections of the Vertical from Astrogeodetic - Inertial Measurements," @default.
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