Radar Navigation ManualDefense Mapping Agency, Hydrographic/Topographic Center, 1979 - 274 sider |
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Side 14
... Equal areas Average power Resting time Pulse length radiated pulses and is called the PEAK POWER of the system . Since the radio - frequency energy travels at a speed of 161,829 Power is normally measured as an average value over a ...
... Equal areas Average power Resting time Pulse length radiated pulses and is called the PEAK POWER of the system . Since the radio - frequency energy travels at a speed of 161,829 Power is normally measured as an average value over a ...
Side 15
... equal to peak power times the duty cycle , average power = 200 kw x 0.001 0.2 kilowatt = High peak power is desirable in order to produce a strong echo over the maximum range of the equipment . Low average power enables the transmitter ...
... equal to peak power times the duty cycle , average power = 200 kw x 0.001 0.2 kilowatt = High peak power is desirable in order to produce a strong echo over the maximum range of the equipment . Low average power enables the transmitter ...
Side 2
... equal field intensities . Longer and broader lobes may be drawn connecting points of equal , but lesser , field intensities . The vertical - plane coverage diagram as illustrated in figure 1-19 , while not representative of navigational ...
... equal field intensities . Longer and broader lobes may be drawn connecting points of equal , but lesser , field intensities . The vertical - plane coverage diagram as illustrated in figure 1-19 , while not representative of navigational ...
Side 5
... equal magnitude and 90 ° out of phase , the ellipse will become a circle , and the resultant wave will be CIRCULARLY POLARIZED . FACTORS AFFECTING MAXIMUM RANGE Frequency The higher the frequency of 1-23 Antenna height as well as ...
... equal magnitude and 90 ° out of phase , the ellipse will become a circle , and the resultant wave will be CIRCULARLY POLARIZED . FACTORS AFFECTING MAXIMUM RANGE Frequency The higher the frequency of 1-23 Antenna height as well as ...
Side 7
... equal to half the pulse length of the radar ( 164 yards per microsecond of pulse length ) . Elec- tronic considerations such as the recovery time of the receiver and the duplexer ( TR and anti - TR tubes assembly ) extend the minimum ...
... equal to half the pulse length of the radar ( 164 yards per microsecond of pulse length ) . Elec- tronic considerations such as the recovery time of the receiver and the duplexer ( TR and anti - TR tubes assembly ) extend the minimum ...
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1817 LIBRARIES antenna beam width bearing cursor bearings and ranges cathode-ray tube circuit clutter course and speed CPA as determined Decca Radar detected direction of relative echoes electronic fixed range rings following radar bearings frequency heading flash heading line indirect waves Kelvin Hughes Linthicum Heights logarithmic scale Maneuvering Board MEGAHERTZ MICHIGAN microsecond minutes nautical miles navigational operation parallel-line cursor Plotting Sheet PPI display pulse length racon radar beam radar contact radar observer radar range setting radar set RADAR SHORELINE radarscope radiation range and bearing Range at CPA range scale setting rapid radar plotting receiver gain reflection plotter relative motion relative plot relative positions Reproduced by Courtesy reset risk of collision rotated set and drift ship as determined ship Course ship's position ship's speed ship's true course-speed solution switch tion traffic separation scheme transfer plotting true course true vector vector triangle vessel
Populære avsnitt
Side 2 - ... (c) Assumptions shall not be made on the basis of scanty information, especially scanty radar information. (d) In determining if risk of collision exists the following considerations shall be among those taken into account: (I) Such risk shall be deemed to exist if the compass bearing of an approaching vessel does not appreciably change...
Side 4 - When two steam vessels are crossing, so as to involve risk of collision, the vessel which has the other on her own starboard side shall keep out of the way of the other.
Side 111-108 - A vessel shall not cross a narrow channel or fairway if such crossing impedes the passage of a vessel which can safely navigate only within such channel or fairway.
Side 111-109 - A vessel nearing a bend or an area of a narrow channel or fairway where other vessels may be obscured by an intervening obstruction shall navigate with particular alertness and caution and shall sound the appropriate signal prescribed in Rule 34(e).
Side 4 - ... shall be deemed to be an overtaking vessel; and no subsequent alteration of the bearing between the two vessels shall make the overtaking vessel a crossing vessel within the meaning of these rules, or relieve her of the duty of keeping clear of the overtaken vessel until she is finally past and clear.
Side 3 - In a narrow channel or fairway when overtaking can take place only if the vessel to be overtaken has to take action to permit safe passing, the vessel intending to overtake shall indicate her intention by sounding the appropriate signal prescribed in Rule 34(c)(i).
Side 4 - A vessel which is close-hauled on the port tack shall keep out of the way of a vessel which is close-hauled on the starboard tack. (c) "When both are running free, with the wind on different sides, the vessel which has the wind on the port side shall keep out of the way of the other.
Side 2 - Alteration of course alone may be the most effective action to avoid close quarters provided that: (a) There is sufficient sea room.
Side 4 - When two steam- vessels are meeting end on, or nearly end on, so as to involve risk of collision, each shall alter her course to starboard, so that each may pass on the port side of the other.
Side 95 - A steam vessel hearing, apparently forward of her beam, the fog signal of a vessel, the position of which is not ascertained shall, so far as the circumstances of the case admit, stop her engines, and then navigate with caution until danger of collision is over.