A.Raising the antenna height increases the radar range
B.The ability of radar to detect objects is unaffected by weather conditions
C.Radar bearings are less accurate than radar ranges
D.Radar should be checked regularly during clear weather to ensure that it is operating properly
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A.Serrated range rings
B.Indirect echoes
C.Multiple echoes
D.Blind sector
A.Set and drift of the current
B.Relative track information
C.Predicted time of CPA
D.Initial range of acquisition
A.enhance weak target echoes and brighten them on the PPI
B.reduce clutter over the entire PPI by shortening the echoes
C.only suppress weak targets to a limited distance from the ship (sea clutter)
D.reduce the beam width to provide a map-like presentation for navigation
A.Immediately after floating free
B.After about one hour when the salt water activates the battery
C.Only when keyed by the radar of another vessel
D.Only when daylight activates the photovoltaic cell
A.the best fix is obtained by using a tangent bearing and a range
B.and using two radar ranges for a fix,the objects of the ranges should be close to reciprocal bearings
C.and using ranges,the most rapidly changing range should be measured last
D.and crossing a radar range of one object with the visual bearing of a second object,the two objects should be 80°to 110°apart
最新試題
PPI is().
The development of()led to the fully automatic ARPA systems installed on commercial ships.
You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must().
Your ARPA has been tracking a target and has generated the targets course and speed.The radar did not receive a target echo on its last two scans due to the weather.What should you expect under these circumstances().
You are using a radar in which your own ship is shown at the center,and the heading flash always points to 0°. If bearings are measured in relation to the flash,what type of bearings are produced? ()
()is not used in modern radar.
When hitting a solid object such as a ship or an airplane,the radar waves are reflected back ()they came.
When you turn on the fast time constant (differentiator) control of a radar it will().
Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope().
Which condition indicates that your radar needs maintenance?()