| Term
|
Definition
|
Source
|
| Accuracy
|
Degree of conformance between estimated
parameter at a given time and its true parameter at that
time.
|
Resolution A.915(22)
|
| Accuracy of
position
|
Radionavigation system accuracy is usually
presented as a statistical measure of system error and is specified
as: Predictable: The accuracy of a radionavigation system's position
solution with respect to the charted solution. Both the position
solution and the chart must be based upon the same geodetic datum.
Repeatable: The accuracy with which a user can return to a position
whose coordinates has been measured at a previous time with the same
navigation system. Relative: The accuracy with which a user can
measure position relative to that of another user of the same
navigation system at the same time.
|
Education Curriculum on Global
Navigation Satellite Systems -Glossary; by UNOOSA (United
Nations Office for Outer Space Affairs)
|
| Amount of data types
|
The amount of data types is a certain set
of unique data types at output of PNT-DP.
|
-
|
| Application grade
|
Specifies the need on amount and type of
PNT(PVT) data in relation to navigational use cases (see figure
6).
|
-
|
| Attitude
|
The orientation of a craft or other object
in a plane or space.
|
-
|
| Attitude of AHRS
|
Roll, pitch and rate-of-turn about all
three axes; accounting for the six-degrees of freedom of ships at
sea
|
Adopted from generally accepted
scholarly definitions for Attitude and Heading Reference Systems
(AHRS)
|
| Availability - System
|
The percentage of time that a system is
performing a required function or set of functions under stated
conditions in a specified interval of time.
|
Derived from Resolution
A.915(22)
|
| Availability - Data
|
The percentage of time that data is
provided in a specified interval of time.
|
|
| Compatibility
|
Refers to the ability of global and
regional navigation satellite systems and augmentations to be used
separately or together without causing unacceptable interference
and/or other harm to an individual system and/or service: The
International Telecommunication Union (ITU) provides a framework for
discussions on radiofrequency compatibility. Radiofrequency
compatibility should involve thorough consideration of detailed
technical factors, including effects on receiver noise floor and
cross-correlation between interfering and desired signals;
Compatibility should also respect spectral separation between each
system's authorized service signals and other systems' signals.
Recognizing that some signal overlap may be unavoidable, discussions
among providers concerned will establish the framework for
determining a mutually acceptable solution;
|
GNSS - Glossary; by
UNOOSA
|
| Configuration
parameter
|
Initial settings of a system used to manage
and/or control the system operation regarding used input data,
realized tasks, used techniques, applied functions and/or aimed
output data.
|
-
|
| Consistency of data
|
Characteristic of a data set to be
compliant with a common model (spatial, temporal, and physical)
specifying the relationship among each other.
|
-
|
| Consistent Common Reference
Point (CCRP)
|
Location on own ship, to which all
horizontal measurements such as target range, bearing, relative
course, relative speed, closest point of approach (CPA) or time to
closest point of approach (TCPA) are referenced, typically the
conning position of the bridge.
|
MSC.252(83)
|
| Consistent Common Reference
System (CCRS)
|
A sub-system or functions for acquisition,
processing, storage, surveillance and distribution of data and
information providing identical and obligatory reference to
sub-systems and subsequent functions to other connected equipment or
units as available.
|
Derived from MSC.252(83)
|
| Control variable
|
Dynamic value extracted from intra-system
status and used for intra-system process controlling (data, tasks,
techniques, functions).
|
-
|
| Continuity
|
Continuity is the ability of a system to
perform uninterruptedly its functions for a specified period of
time. More specifically, continuity is the probability that the
specified system performance will be maintained for the duration of
a phase of operation, presuming that the system was available at the
beginning of that phase of operation.
|
Modified
Navipedia
|
| Data
|
Carrier of information.
|
|
| Degraded condition
|
Reduction in system functionality and/or
performance as a result of deviations from standard conditions
induced by e.g. disturbances, malfunctions and failures.
|
Derived from MSC.252(83)
|
| Ephemeris
|
Parameters, such as Keplerian coefficients,
that can be used to compute a satellite's position at a specified
time.
|
GNSS - Glossary; by UNOOSA
|
| Error correlation
|
Error correlation describes how far the
accuracy and integrity of two variables (provided by different
sensors or techniques) are influenced by the same errors.
|
-
|
| Integrity
|
The ability to provide users with
information within a specified time when the system should not be
used for navigation including measures and/or indicating of
trust
|
Derived from Resolution
A.915(22)
|
| Integrity data
|
Result of integrity evaluation
characterizing the current performance of the system (e.g. flags) or
individual data products (e.g. performance data).
|
-
|
| Method
|
Used for the realization of a function
employing dedicated algorithms.
|
-
|
| Movement
|
Change of position and/or attitude over
time.
|
-
|
| Nautical application(s)
|
Technical function(s) to assist or support
the realization of a nautical task.
|
-
|
| Navigational phase
|
Spatial characterization of typical
navigation scenarios such as navigation at open sea, in coastal
areas, restricted waters, port entries, …docking, etc.
|
-
|
| Navigational situation
|
Situation of the individual ship taking
into account the navigational phase as well as environment
(geometric, bathymetric, traffic conditions, etc.
|
-
|
| Nautical task
|
Tasks covering nautical aspects, e.g.
"Route planning" or "Route monitoring" or "Collision avoidance" or
"Navigation control data" or "Status and data display" or "Alert
management"
|
Generalization of INS related definition
in MSC.252(83)
|
| Performance class
|
The set of supported maximum possible
performance levels by an individual PNT-DP.
|
-
|
| Performance level
|
The degree of merit achieved by each single
performance parameter.
|
-
|
| Performance parameter
|
Parameters used in relation to data output
of PNT-DP are accuracy, integrity, continuity, and availability per
individual PNT output data.
|
-
|
| Plausibility of
data
|
Characteristic of data to be within the
defined range for the respective type of data.
|
Derived from MSC.252(83)
|
| Protection level
|
The protection level provides an estimate
for current data accuracy taking into account error models, error
measurements as well as requirements on tolerable residual risk of
integrity monitoring (failed evaluation)
|
-
|
| Resilience
|
Resilience is the ability of a system to
detect and compensate external and internal disturbances,
malfunction and breakdowns in parts of the system. This should be
achieved without loss of functionalities and preferably without
degradation of their performance.
|
NCSR 1/9 (Annex 1);
NAV58/6/1
|
| Scalability
|
Scalability is the ability of a system to
adapt its operation to different demands and application
conditions.
|
-
|
| Ship Sensed
Position
|
A position as determined through the use of
onboard equipment or information such as visual bearings, radar
ranges, depth of water, radio direction finding, etc. This may also
include astronomical observation.
|
AMSA
|
| Source
|
A device (sensor, receiver, transmitter) or
a location of generated, stored or recorded data used for required
input data.
|
Generalization of INS related definition
in MSC.252(83)
|
| Uncorrelated error
|
If the influence of same error sources on
different sensors or data can be excluded, it can be assumed, that
their error parts and behaviour are uncorrelated.
|
|