問題一覧
1
It means any object fixed or moving whose position and motion is determined by measurements of range and bearing on radar.
Target
2
The speed of a target related to own ship, as deduced from a number of measurements of its range and bearing on the radar.
target relative motion
3
The indication on the display of a linear extrapolation into the future of a target's motion, based on measurements of the targets range and bearing on the radar in the recent past
target predicted motion
4
The direction of motion of a target related to own ship as deduced from a number of measurements of its range and bearing on the radar, expressed as an angular distance from north.
relative course
5
The direction of one terrestrial point from another, expressed as an angular distance from north.
bearing
6
The range at which the other vessel will pass directly ahead or astern and found by measuring the distance from where the Line of Approach crosses the heading line to the center of the plotting sheet.
bow crossing range
7
it is the point of origin of own vector and target vector
e
8
It is the initial position of contact.
r
9
It is the end of target ship relative movement on the first vector triangle
m
10
represents own course and speed
e-r vector
11
represents new own course and speed.
e-r1 vector
12
represents target true course and true speed. Also called as the contact vector in the vector triangle.
e-m vector
13
The whole process of target detection, tracking, calculation of parameters and display of information.
radar plotting
14
method of solving radar problems primarily the relative motion
rapid radar plotting
15
consisting of relative motion information on courses, speeds, CPA TCPA, targets true course and speed, aspect.
1st vector triangle
16
Planning an avoidance maneuver and solve for an own ship course and/or speed change in accordance with the Rules of the Road and determine the effect of the proposed course/speed change on all targets CPA.
2nd vector triangle
17
Defined as if the same ships motion is observed by another ship that is, also in motion and the motion of each ship is relative to each other.
reltive motion
18
connects the line between the first and the last observation in Radar plotting.
relative motion line
19
it is a line drawn from mx to new CPA in Radar plotting. It is the relative motion line after own ship has maneuvered
new relative motion line
20
is a line along I-m which is parallel to the center of the plot.
direction of a relative motion
21
abstract concept on how quickly the contact moves down the relative motion line.
speed of relative motion
22
The position of the other ship on Relative Motion Line at planned time of evasive action and the point of execution.
mx
23
is the distance from the center of the plot to the closest point on the RML
cpa
24
The time estimated as measured along the echo line form its present position to the closest point of approach.
tcpa
25
This is the desired distance the own ship wants to clear the target
ncpa
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distance from the center of the maneuvering board perpendicular to the extended "em" vector.
closest point of approach
27
This is the closest you want the target to get to you in establishing the new CPA
danger sone boundary
28
line transferred in plotting own ship new course to steer from m" towards "r”
new relative CPA
29
The relative bearing of own ship from the target, expressed in degrees between 000° - 180° Red or Green.
target aspect
30
It is the direction of relative motion transferred to the center
drml
31
it is the rate between the first and second observation.
srml
32
it is where the avoidance course measured
Along e-r vector between NRML and e