Communications: directive radio wave systems and devices (e.g. – With particular circuit – Display
Patent
1990-01-31
1991-11-12
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Display
342 41, 342181, 342182, G01S 722
Patent
active
050651617
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE PRESENT INVENTION
The present invention relates to a ship track indicating apparatus for detecting the positions of other ships by means of a radar apparatus and for indicating the tracks of other ships.
TECHNICAL BACKGROUND OF THE PRESENT INVENTION
Up to the present, radar apparatuses have been used for not only locating the present positions of other ships but also observing movements of the other ships by indicating the tracks thereof.
In order to display the track of another ship on the screen of the indicator of a radar apparatus, a prior art method has been used to display on an indicator radar echoes corresponding to tens to a few hundreds of previous radar scans ones over others in a different color from colors for indicating radar echoes obtained with the present or latest radar scan.
FIG. 14 shows an example of an image displayed on the screen of an indicator of a conventional ship track indicating apparatus. As shown in the figure, with conventional ship track indicating apparatii, radar images corresponding to a few tens to a few hundreds of previous radar scans are displayed ones over others so that displayed ship tracks are broadened in width. The width of the ship track becomes wider as the size of a ship becomes larger. This results in a difficulty to distinguish the ship track of each ship from the tracks of the other ships, since the face of the indicator is occupied by many ship tracks. There is another problem that random noises produced with each of a few tens to a few hundreds of radar scans will be accumulated to be displayed on the screen of the indicator, which also makes it difficult to identify the track of another ship.
An object of the present invention is to provide a ship track indicating which is capable of suppressing displayed ship track from being broadened and preventing noise appearances from being accumulated so that each ship track of other ships can be easily identified.
Another object of the present invention is to provide a ship track indicating apparatus which is capable of suppressing ship track images from being widened and easily recognizing from displayed radar echo images characters of radar echoes such as the size of the echoes, the attitude thereof and the like.
DISCLOSURE OF THE INVENTION
A first feature of a ship track indicating apparatus, according to the present invention, comprises a radar apparatus for detecting positions of another ship, radar echo transforming means for identifying a group of radar echoes extending over a predetermined number of radar sweeps in an angular direction and deriving one point or a plurality of points representative of the group of radar echoes, ship track memorizing means for memorizing fine points representative of positions of another ship to form a ship track, and indicating means for displaying the contents of the ship track memorizing means as images on the face thereof.
A second feature of a ship track indicating apparatus, according to the present invention, comprises a radar apparatus for detecting positions of another ship, radar echo group deriving means for deriving a group of radar echoes continuously extending over predetermined widths both in an angular direction and in range from the output signals of the radar apparatus, radar echo transforming means for deriving one point or a plurality of points representative of the derived group of radar echoes, radar echo group's character deriving means for deriving the size and/or altitude of the derived group of radar echoes, ship track memorizing means for memorizing fine spots representative of positions of another ship to form a ship track, echo group's character memorizing means for memorizing the obtained characters of the derived echo group, and indicating means for indicating the contents of the echo group's character memorizing means at positions specified by the contents of the ship track memorizing means.
With regard to the first feature of a ship track indicating apparatus, according to the present invention, the radar app
REFERENCES:
patent: 3978480 (1976-08-01), Tsuruta et al.
patent: 3981008 (1976-09-01), Mann
patent: 4208657 (1980-06-01), Bryden et al.
"Digiplot" (brochure) Iotron Corp., Bedford, Mass.
Barron Jr. Gilberto
Furuno Electric Company Limited
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