Horology: time measuring systems or devices – Astronomical – With tide display
Reexamination Certificate
1999-06-08
2001-09-25
Roskoski, Bernard (Department: 2859)
Horology: time measuring systems or devices
Astronomical
With tide display
Reexamination Certificate
active
06295248
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electronic tide meter for calculating a high tide time and low tide time and displaying the result, a method for calculating a high/low tide time and a for executing the method.
2. Description of the Related Art
Tide, defined as the phenomenon of the rising and falling of the sea surface, is a phenomenon to which attention should be paid by those particularly engaged in fishery. Additionally, tide rise and fall are considered important also for those who enjoy shell gathering or marine sports in the coastal area.
Knowing the tide phenomenon, particularly a high tide time and low tide time within a day, is achieved by calculating tide levels based on a harmonic dissolution method. Generally, the results of tide level calculations are available to the public as regional tide information published by public agencies. High tide time and low tide time are to be known by reading the tide information.
However, such reading is inefficient for those who always require information of tide phenomenon. Also, in many cases all of the available tide phenomenon information are not always required. Thus, there has been a desire for a means to know desired tide phenomenon information, particularly high tide time and low tide time.
Under such a situation, an electronic tide meter has been proposed which derives a tide level estimating equation from previously stored tide data and calculates a desirably-dated high tide time and low tide time using the derived tide level estimating equation to calculated and display the result. The tide level estimating equation is a calculating equation prescribed by the harmonic dissolving method using empirically-obtained regional tide data, to determine a tide level at a certain time. For example, according to an electronic tide meter disclosed in JP-B-6-27868 publication, tide levels at a certain time interval corresponding to one day are determined using the above-described tide level estimating equation, and from the determined tide data a extreme values are derived by a approximation method. Then, from the derived extreme values an extreme value with only a proper time interval obtained. The extreme value as a high tide or low tide level is calculated for a high tide time and low tide time.
Meanwhile, according to a tide display apparatus disclosed in JP-A-58-146819 publication, a tide as determined from the above-described tide level estimating equation is graphically displayed to enable reading a high tide time and low tide time from a displayed graph.
However, in order to determine a high tide time and low tide time with accuracy, it is required in the above-mentioned tide level estimating equation to determine the increased number of tide levels with a time interval that is as short as possible. To achieve this, memory with a large capacity had to be used to store many calculated tide data further there is an increased operation time.
In the electronic tide meter disclosed in the above-mentioned JP-B-6-27868 publication, in order to determine a high tide time and low tide time with higher accuracy, it has also been required to determine much of tide data from the tide level estimating equation using a short time interval.
Further, the above-mentioned tide display apparatus disclosed in the JP-A-58-146819 publication time and low tide time, and includes a similar problem to the electronic tide meter disclosed in the JP-B-6-27868 publication.
SUMMARY OF THE INVENTION
The present invention the drawbacks of the prior are. It is an object of the present invention to provide an electronic tide meter for calculating a high tide time and low tide time with high accuracy and at high speed. It is another object of the present invention to provide a high tide/low tide time calculating method and a computer algorithm for executing the invention method.
In order to solve the above-stated problem and achieve the object of the invention an electronic tide meter is provided according to a first embodiment of the present invention, characterized by being provided with: input means for selecting a region and inputting a calendar date; memory means for storing tide data for each region; operating means for determining with a first time interval first tide level data from a tide level estimating equation dependent on the calendar date and the tide data specified by the selected region. A second tide level data is determined with a second time interval shorter than the first time interval from the tide level estimating equation, and calculating from the second tide level data a time that desired tidal phenomenon occurs.
According to this structure, the operating means is provided which performs two staged tide level data calculation such that a first tide level data is determined with a first time interval from a tide level estimating equation dependent on a selected calendar and tide data for each region. A second tide level data is determined with a second time interval shorter in time interval than the first time interval. Accordingly, a range having precise information required can be selected to determine tide level data with a fine time interval for that range. It is therefore possible to eliminate useless operating time and calculate with accuracy a time that desired tide phenomenon occurs.
Also, an electronic tide meter is provided according to a second of the present invention. An electronic tide meter for calculating a high tide time and low tide time by using a tide level estimating equation dependent on an inputted calendar date and tide data of a selected region, characterized by being provided with: operating means for determining with a first time interval first tide level data from the tide level estimating equation, determining, when a sign in displacement between successive ones of the first tide level data changed. Second tide level is determined from the tide level estimating equation with a second time interval shorter in time interval than the first time interval at around a time that the sign in displacement changed. The high tide time and low tide time are then calculated from the second tide level data.
According to this structure, the operating means is provided which performs two staged tide level data calculation such that first tide level data is determined with a first time interval from a tide level estimating equation dependent on a selected a calendar date and tide data for each region. A second tide level data is determined with a second time interval shorter in time interval that the first time interval. Accordingly, a range having precise information required can be selected to determine tide level data with a fine time interval for that range thereby accurately calculating a high tide time and low tide time. It is therefore possible to eliminate useless operating time and calculate with accuracy a high tide time and low tide time.
Also, an electronic tide meter according to a third embodiment of the present invention, in an electronic tide meter for calculating a high tide time and low tide time by using a tide level estimating equation fixed by an inputted calendar and tide data of a selected region, characterized by being provided with: operating means for determining with a first time interval first tide level data from the tide level estimating equation, and determining, when a sign in displacement between successive ones of the first tide level data changed, second tide level data from the tide level estimating equation with a second time interval shorter in time interval than the first time interval at around a time that the sign/in displacement changed; and calculating means for determining an extreme value by interpolating the second tide level data and calculating the high tide time and low tide time from the second tide level.
According to this structure, the operating means is provided which performs two staged tide level data calculation such that first tide level data is determined with a first time interval from a tide level estimat
Adams & Wilks
Roskoski Bernard
Seiko Instruments Inc.
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