Position, Navigation, and Timing Technologies in the 21st Century
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Position, Navigation, and Timing Technologies in the 21st Century: краткое содержание, описание и аннотация
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Volume 1 of
contains three parts and focuses on the satellite navigation systems, technologies, and engineering and scientific applications. It starts with a historical perspective of GPS development and other related PNT development. Current global and regional navigation satellite systems (GNSS and RNSS), their inter-operability, signal quality monitoring, satellite orbit and time synchronization, and ground- and satellite-based augmentation systems are examined. Recent progresses in satellite navigation receiver technologies and challenges for operations in multipath-rich urban environment, in handling spoofing and interference, and in ensuring PNT integrity are addressed. A section on satellite navigation for engineering and scientific applications finishes off the volume.
Volume 2 of
consists of three parts and addresses PNT using alternative signals and sensors and integrated PNT technologies for consumer and commercial applications. It looks at PNT using various radio signals-of-opportunity, atomic clock, optical, laser, magnetic field, celestial, MEMS and inertial sensors, as well as the concept of navigation from Low-Earth Orbiting (LEO) satellites. GNSS-INS integration, neuroscience of navigation, and animal navigation are also covered. The volume finishes off with a collection of work on contemporary PNT applications such as survey and mobile mapping, precision agriculture, wearable systems, automated driving, train control, commercial unmanned aircraft systems, aviation, and navigation in the unique Arctic environment.
In addition, this text:
Serves as a complete reference and handbook for professionals and students interested in the broad range of PNT subjects Includes chapters that focus on the latest developments in GNSS and other navigation sensors, techniques, and applications Illustrates interconnecting relationships between various types of technologies in order to assure more protected, tough, and accurate PNT
will appeal to all industry professionals, researchers, and academics involved with the science, engineering, and applications of position, navigation, and timing technologies.pnt21book.com
and
. The clock bias
is estimated by solving a weighted least‐squares (WLS) problem, resulting in the estimate
, where Wis the weighting matrix. The true clock bias of the i‐ th BTS can now be expressed as
, where w iis a zero‐mean Gaussian random variable with variance
.
and η i≜ v i− w imodels the overall uncertainty in the pseudorange measurement. Hence, the vector
is a zero‐mean Gaussian random vector with a covariance matrix ∑= C+ R, where
is the covariance matrix of
and
is the covariance of the measurement noise vector
. The Jacobian matrix Hof the nonlinear measurements
with respect to
is given by
, where
denotes the nonlinear measurements
evaluated at the current estimate
.
and velocity
as well as the difference between the receiver’s clock bias and each BTS and the difference between the receiver’s clock drift and each BTS, specifically
; δt rand
are the receiver’s and the i ‐th BTS clock bias, respectively; and
and
are the receiver’s and the i ‐th BTS clock drift, respectively.