CN107421522A - Course display methods and device - Google Patents
Course display methods and device Download PDFInfo
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- CN107421522A CN107421522A CN201710290176.9A CN201710290176A CN107421522A CN 107421522 A CN107421522 A CN 107421522A CN 201710290176 A CN201710290176 A CN 201710290176A CN 107421522 A CN107421522 A CN 107421522A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/36—Repeaters for remote indication of readings of a master compass
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Abstract
The invention discloses a kind of course display methods, applied to intelligent glasses, including：Obtain the geomagnetic field intensity at user's driving ship position；The magnetic heading of the ship is calculated according to the geomagnetic field intensity of acquisition；The magnetic heading of calculating is modified to obtain the true course of the ship, and shows the obtained true course.The invention also discloses a kind of course display device.The present invention can improve the security of ship's navigation.
Description
Technical field
The present invention relates to intelligent terminal technical field, more particularly to course display methods and device.
Background technology
Electronic compass can provide course and the posture of mobile object in real time, now just as a kind of important navigational tool
It is widely used in various fields, such as ship's navigation by people, flying object flight is medium.By taking ship's navigation as an example, driver needs
The electronic compass installed by ship carries out navigational calibration to identify the real-time course of ship with this.However, electronic compass leads to
Often it is fixedly mounted on the bridge of ship, it is necessary to which driver bows is checked, this, which results in driver, can not take into account sieve
, certain safety problem be present in disk course and front sea situation.
The content of the invention
It is a primary object of the present invention to provide a kind of course display methods and device, it is intended to improve the safety of ship's navigation
Property.
To achieve the above object, a kind of course display methods provided by the invention comprises the following steps：
Obtain the geomagnetic field intensity at user's driving ship position；
The magnetic heading of the ship is calculated according to the geomagnetic field intensity of acquisition；
The magnetic heading of calculating is modified to obtain the true course of the ship, and shows the obtained true boat
To.
Alternatively, the true course that the described pair of magnetic heading calculated is modified to obtain the ship includes：
Obtain the magnetic declination at the corresponding ship position；
Using the magnetic declination and the magnetic heading and be worth the true course as the ship.
Alternatively, the step of acquisition corresponds to the magnetic declination at the ship position includes：
It is determined that with city nearest at the ship position；
According to default city and the corresponding relation of magnetic declination, using magnetic declination corresponding to the city as the ship institute
In the magnetic declination of opening position.
Alternatively, while the true course that display obtains, following steps are also performed：
The true course is compared with prearranged heading；
Reach predetermined angle in the true course and the prearranged heading deviation, and the duration that angular deviation occurs reaches
During to the first preset duration, the first warning message is exported.
Alternatively, the course display methods also includes：
Accumulative eye-closing period of the counting user in preset time period；
When the accumulative eye-closing period of statistics reaches the second preset duration, the second warning message is exported.
In addition, to achieve the above object, the present invention also provides a kind of course display device, including：
Acquisition module, for obtaining the geomagnetic field intensity at user's driving ship position；
Computing module, for calculating the magnetic heading of the ship according to the geomagnetic field intensity of acquisition；
Display module, for being modified to obtain the true course of the ship to the magnetic heading of calculating, and show
The true course arrived.
Alternatively, the display module is additionally operable to obtain the magnetic declination at the corresponding ship position；Being additionally operable to will
The magnetic declination and the true course magnetic heading and that value is as the ship.
Alternatively, the display module is additionally operable to determine and city nearest at the ship position；It is additionally operable to root
According to default city and the corresponding relation of magnetic declination, using magnetic declination corresponding to the city as the ship position at
Magnetic declination.
Alternatively, the course display device also includes the first alarm module, for will be obtained in the display module
While true course is shown on the intelligent glasses, the true course is compared with prearranged heading；It is additionally operable to described
True course and the prearranged heading deviation reach predetermined angle, and the duration that angular deviation occurs reaches the first preset duration
When, export the first warning message.
Alternatively, the course display device also includes the second alarm module, for counting user in preset time period
Accumulative eye-closing period；It is additionally operable to when the accumulative eye-closing period of statistics reaches the second preset duration, exports the second warning message.
Course display methods proposed by the present invention and device, applied to intelligent glasses, by driving ship place to user
The geomagnetic field intensity of opening position is obtained, and the magnetic boat of user's driving ship is then calculated according to the geomagnetic field intensity got
To, and then magnetic heading is modified to obtain the true course of user's driving ship, shown so that user can take into account compass
Course and front sea situation, improve the security of ship's navigation.
Brief description of the drawings
Fig. 1 is the module diagram of display device first embodiment in course of the present invention；
Fig. 2 is the schematic flow sheet of display methods first embodiment in course of the present invention.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of course display device, reference picture 1, in the first embodiment of course display device of the present invention
In, the course display device includes：
Acquisition module 10, for obtaining the geomagnetic field intensity at user's driving ship position；
Computing module 20, for calculating the magnetic heading of user's driving ship according to the geomagnetic field intensity of acquisition；
Display module 30, for being modified to obtain the true course of user's driving ship to the magnetic heading of calculating, and show
Obtained true course.
It should be noted that course display device of the present invention realizes function based on intelligent glasses, driven for obtaining user
The true course of ship, and the true course of acquisition is included checking for user on intelligent glasses so that user can take into account compass
Course and front sea situation.Therefore, the major programme of the present invention is：The earth's magnetic field at ship position is driven to user first
Intensity is obtained, and the magnetic heading of user's driving ship is then calculated according to the geomagnetic field intensity got, and then magnetic is navigated
To the true course for being modified to obtain user and driving ship, shown.
In embodiments of the present invention, acquisition module 10 is firstly the need of the earth magnetism field strength driven to user at ship position
Degree is obtained, and can specifically be obtained by three preset axle geomagnetic sensors of intelligent glasses, so it is easy to understand that intelligent glasses lead to
Often worn by user, three axle geomagnetic sensors detections to geomagnetic field intensity be user drive ship where at earth magnetism field strength
Degree, for example, it is (H that acquisition module 10, which gets the geomagnetic field intensity that user is driven at ship place,x、Hy、Hz)。
After the geomagnetic field intensity that user is driven at ship position is got, acquisition module 10 is by the earth magnetism of acquisition
Field intensity is transmitted to computing module 20 and calculated.
Computing module 20 is after the geomagnetic field intensity of the transmission of acquisition module 10 is received, according to the geomagnetic field intensity of reception
The magnetic heading that ship is driven to user calculates, specifically, being projected geomagnetic field intensity to ground level using equation below：
Xr=Hxcosα+Hysinαsinβ-Hzcosβsinα；
Yr=Hycosβ+Hzsinβ；
Wherein, Xr and Yr represents to project to the value of ground level here, and α is the angle of pitch (i.e. the angle of y-axis and horizontal plane),
β is angle of heel (i.e. the angle of x-axis and horizontal plane).
With (Hx、Hy、Hz) reading is magnetic heading θ=arcTan (Yr/Xr) for being calculated exemplified by (30, -236, -447)
=arcTan (- 881.55/-557.2702)=57.70 °.
Be calculated user drive ship magnetic heading after, computing module 20 by the magnetic heading being calculated transmit to
Display module 30 is modified display.
It should be noted that due to geographical south poles and the magnetic south arctic of the earth and misaligned, exist therebetween certain
Angle, referred to as magnetic declination is, it is necessary to which magnetic heading, which is modified, can just obtain true course.
Therefore, display module 30 is carried out to the magnetic heading first after the magnetic heading of the transmission of computing module 20 is received
Amendment, obtain the true course that user drives ship.
Specifically, display module 30 is additionally operable to obtain the magnetic declination at corresponding user's driving ship position；It is additionally operable to
Using the magnetic declination of acquisition and magnetic heading and value as user's driving ship true course.
In this example it is shown that module 30 obtains first when the magnetic heading calculated computing module 20 is modified
The magnetic declination at ship position is driven to corresponding user, and is getting the magnetic declination at user's driving ship position
Afterwards, the magnetic declination got is added with the inquiry that computing module 20 calculates, the two obtained and value i.e. user drive ship
True course.
Wherein, display module 30 is additionally operable to determine and used when obtaining the magnetic declination at user's driving ship position
Family drives city nearest at ship position；The corresponding relation according to default city and magnetic declination is additionally operable to, will be determined
City corresponding to magnetic declination, drive the magnetic declination at ship position as user.
In the present embodiment, according to below equation calculate currently with certain point the distance between：
C=sin (MLatA) * sin (MLatB) * cos (MLonA-MLonB)+cos (MLatA) * cos (MLat B)；
Distance=R*Arccos (C) * Pi/180.
Wherein, A represents the latitude and longitude value (can specifically be obtained by the satellite positioning module of intelligent glasses) of current location, B
For a fixed latitude and longitude value, the central value in city is represented, B longitude and latitude degrees of data is by taking Hangzhou as an example herein：Its longitude：
120.1260, latitude：30.2612.
A longitude and latitude is (LonA, LatA), and second point B longitude and latitude is (LonB, LatB), according to the base of 0 degree of warp
Standard, east longitude degree of learning from else's experience take 90- latitude values (90- on the occasion of (Longitude), west longitude degree of learning from else's experience negative value (- Longitude), north latitude
Latitude), south latitude takes 90+ latitude values (90+Latitude), then by it is above-mentioned it is treated after 2 points be counted as (MLonA,
) and (MLonB, MLatB) MLatA.
Pass through above formula, it is known that AB point-to-point transmissions are at a distance of 8.581km.
Display module 30 compares the longitude and latitude degrees of data of A points with other points, selection with A points at a distance of nearest city, this
Locate as Hangzhou, further by default city and the corresponding relation of magnetic declination, find magnetic declination corresponding to Hangzhou as 4.30 °
(to the west), the magnetic declination at ship position is driven using the magnetic declination as user.
So that the magnetic heading of foregoing calculating is 57.70 ° as an example, 30 revised true course of display module is 57.70 °+4.30 °
=62 °.
Course display device proposed by the present invention, applied to intelligent glasses, by being driven to user at ship position
Geomagnetic field intensity obtained, the magnetic heading that user drives ship is then calculated according to the geomagnetic field intensity that gets, entered
And magnetic heading is modified to obtain the true course of user's driving ship, shown so that user can take into account compass heading
And front sea situation, improve the security of ship's navigation.
The security navigated by water for further ship-lifting, based on first embodiment, it is proposed that course display device of the present invention
Second embodiment, in the present embodiment, course display device also includes the first alarm module, for being shown in display module 30
While obtained true course, foregoing true course is compared with prearranged heading；It is additionally operable in foregoing true course and predetermined boat
Reach predetermined angle to deviation, and when the duration that angular deviation occurs reaches the first preset duration, export the first alarm signal
Breath.
It should be noted that the difference of the present embodiment and aforementioned first embodiment is that this implementation adds course drift
Alarm scheme, only it is explained below, other can refer to the associated description of aforementioned first embodiment, and here is omitted.
In embodiments of the present invention, course display device also includes the first alarm module, and first alarm module is being shown
During the true course obtained after the display amendment of module 30, the true course of its display is got at display module 30.
After the true course of the display of display module 30 is got, the first alarm module is by the true course of acquisition with making a reservation for
Course is compared, with determine user drive ship whether off-course, wherein, prearranged heading is by user according to actual heading need
Want default settings.
Reach predetermined angle in foregoing true course and prearranged heading deviation, and the duration that angular deviation occurs reaches the
One preset duration (setting of the present invention for first preset duration is not particularly limited, can by those skilled in the art according to
It is actually needed and is configured, for example, could be arranged to 5 seconds) when, judge that user drives ship off-course, the first alarm mould
First warning message of the block output prompting current off-course of user.Wherein, the first alarm module is exporting the first warning message
When, the first warning message can be exported by way of voice, image and/or vibration.
For the security of further ship-lifting navigation, based on first embodiment, course display device of the present invention is proposed
3rd embodiment, in the present embodiment, course display device also include the second alarm module, for counting user in preset time
Accumulative eye-closing period in section；It is additionally operable to when the accumulative eye-closing period of statistics reaches the second preset duration, the alarm of output second
Information.
It should be noted that the difference of the present embodiment and aforementioned first embodiment is, this implementation adds tired navigation
Processing scheme, be only explained below, other can refer to the associated description of aforementioned first embodiment, no longer superfluous herein
State.
In embodiments of the present invention, course display device also includes the second alarm module, and second alarm module passes through intelligence
Energy glasses are set, and are detected towards the camera of user's glasses to whether user closes one's eyes, and counting user is in preset time
Section (setting of the present invention for the preset time period is not particularly limited, can by those skilled in the art according to be actually needed into
Row set, for example, could be arranged to 30 seconds) in accumulative eye-closing period, to determine whether user is currently tired navigation.
Reaching the second preset duration in the accumulative eye-closing period of statistics, (setting of the present invention for second preset duration is not
Concrete restriction is done, can be configured by those skilled in the art according to being actually needed, for example, could be arranged to 20 seconds) when, second
It is currently fatigue navigation that alarm module, which determines user, the second warning message of the current fatigue navigation of output prompting user.Wherein,
Two alarm modules can export the second alarm signal when exporting the second warning message by way of voice, image and/or vibration
Breath, the present invention are not particularly limited.
The present invention also provides a kind of course display methods, reference picture 2, implements corresponding to the first of foregoing course display device
Example, in the first embodiment of course display methods of the present invention, the course display methods includes：
Step S10, obtain the geomagnetic field intensity at user's driving ship position；
Step S20, the magnetic heading of user's driving ship is calculated according to the geomagnetic field intensity of acquisition；
Step S30, be modified to obtain the true course that user drives ship to the magnetic heading of calculating, and show obtain it is true
Course.
It should be noted that the course display device of course display methods of the present invention as shown in Figure 1 performs, the course is shown
Device realizes function based on intelligent glasses, the true course of ship is driven for obtaining user, and the true course of acquisition is included
Checked on intelligent glasses for user so that user can take into account compass heading and front sea situation.Therefore, the main side of the present invention
Case is：The geomagnetic field intensity driven first to user at ship position obtains, then according to the earth's magnetic field got
Intensitometer calculates the magnetic heading that user drives ship, and then magnetic heading is modified to obtain the true course of user's driving ship,
Shown.
In embodiments of the present invention, acquisition module 10 is firstly the need of the earth magnetism field strength driven to user at ship position
Degree is obtained, and can specifically be obtained by three preset axle geomagnetic sensors of intelligent glasses, so it is easy to understand that intelligent glasses lead to
Often worn by user, three axle geomagnetic sensors detections to geomagnetic field intensity be user drive ship where at earth magnetism field strength
Degree, for example, it is (H that acquisition module 10, which gets the geomagnetic field intensity that user is driven at ship place,x、Hy、Hz)。
After the geomagnetic field intensity that user is driven at ship position is got, acquisition module 10 is by the earth magnetism of acquisition
Field intensity is transmitted to computing module 20 and calculated.
Computing module 20 is after the geomagnetic field intensity of the transmission of acquisition module 10 is received, according to the geomagnetic field intensity of reception
The magnetic heading that ship is driven to user calculates, specifically, being projected geomagnetic field intensity to ground level using equation below：
Xr=Hxcosα+Hysinαsinβ-Hzcosβsinα；
Yr=Hycosβ+Hzsinβ；
Wherein, Xr and Yr represents to project to the value of ground level here, and α is the angle of pitch (i.e. the angle of y-axis and horizontal plane),
β is angle of heel (i.e. the angle of x-axis and horizontal plane).
With (Hx、Hy、Hz) reading is magnetic heading θ=arcTan (Yr/Xr) for being calculated exemplified by (30, -236, -447)
=arcTan (- 881.55/-557.2702)=57.70 °.
Be calculated user drive ship magnetic heading after, computing module 20 by the magnetic heading being calculated transmit to
Display module 30 is modified display.
It should be noted that due to geographical south poles and the magnetic south arctic of the earth and misaligned, exist therebetween certain
Angle, referred to as magnetic declination is, it is necessary to which magnetic heading, which is modified, can just obtain true course.
Therefore, display module 30 is carried out to the magnetic heading first after the magnetic heading of the transmission of computing module 20 is received
Amendment, obtain the true course that user drives ship.
Specifically, the foregoing magnetic heading to calculating is modified to include the step of obtaining the true course of user's driving ship：
Obtain the magnetic declination at corresponding user's driving ship position；
Using the magnetic declination of acquisition and magnetic heading and value as user's driving ship true course.
In this example it is shown that module 30 obtains first when the magnetic heading calculated computing module 20 is modified
The magnetic declination at ship position is driven to corresponding user, and is getting the magnetic declination at user's driving ship position
Afterwards, the magnetic declination got is added with the inquiry that computing module 20 calculates, the two obtained and value i.e. user drive ship
True course.
Wherein, the step of corresponding user of foregoing acquisition drives the magnetic declination at ship position includes：
It is determined that drive city nearest at ship position with user；
According to default city and the corresponding relation of magnetic declination, by the magnetic declination corresponding to the city of determination, as user
Drive the magnetic declination at ship position.
In this example it is shown that module 30 is additionally operable to when obtaining the magnetic declination at user's driving ship position
It is determined that drive city nearest at ship position with user；It is additionally operable to close according to default city is corresponding with magnetic declination
System, by the magnetic declination corresponding to the city of determination, the magnetic declination at ship position is driven as user.
First according to below equation calculate currently with certain point the distance between：
C=sin (MLatA) * sin (MLatB) * cos (MLonA-MLonB)+cos (MLatA) * cos (MLat B)；
Distance=R*Arccos (C) * Pi/180.
Wherein, A represents the latitude and longitude value (can specifically be obtained by the satellite positioning module of intelligent glasses) of current location, B
For a fixed latitude and longitude value, the central value in city is represented, B longitude and latitude degrees of data is by taking Hangzhou as an example herein：Its longitude：
120.1260, latitude：30.2612.
A longitude and latitude is (LonA, LatA), and second point B longitude and latitude is (LonB, LatB), according to the base of 0 degree of warp
Standard, east longitude degree of learning from else's experience take 90- latitude values (90- on the occasion of (Longitude), west longitude degree of learning from else's experience negative value (- Longitude), north latitude
Latitude), south latitude takes 90+ latitude values (90+Latitude), then by it is above-mentioned it is treated after 2 points be counted as (MLonA,
) and (MLonB, MLatB) MLatA.
Pass through above formula, it is known that AB point-to-point transmissions are at a distance of 8.581km.
Display module 30 compares the longitude and latitude degrees of data of A points with other points, selection with A points at a distance of nearest city, this
Locate as Hangzhou, further by default city and the corresponding relation of magnetic declination, find magnetic declination corresponding to Hangzhou as 4.30 °
(to the west), the magnetic declination at ship position is driven using the magnetic declination as user.
So that the magnetic heading of foregoing calculating is 57.70 ° as an example, 30 revised true course of display module is 57.70 °+4.30 °
=62 °.
Course display methods proposed by the present invention, applied to intelligent glasses, by being driven to user at ship position
Geomagnetic field intensity obtained, the magnetic heading that user drives ship is then calculated according to the geomagnetic field intensity that gets, entered
And magnetic heading is modified to obtain the true course of user's driving ship, shown so that user can take into account compass heading
And front sea situation, improve the security of ship's navigation.
The security navigated by water for further ship-lifting, based on first embodiment, it is proposed that course display methods of the present invention
Second embodiment, corresponding to the second embodiment of foregoing course display device, in the present embodiment, obtained in display described in
While true course, following steps are also performed：
Foregoing true course is compared with prearranged heading；
Reach predetermined angle in foregoing true course and prearranged heading deviation, and the duration that angular deviation occurs reaches the
During one preset duration, the first warning message is exported.
It should be noted that the difference of the present embodiment and aforementioned first embodiment is that this implementation adds course drift
Alarm scheme, only it is explained below, other can refer to the associated description of aforementioned first embodiment, and here is omitted.
In embodiments of the present invention, course display device also includes the first alarm module, and first alarm module is being shown
During the true course obtained after the display amendment of module 30, the true course of its display is got at display module 30.
After the true course of the display of display module 30 is got, the first alarm module is by the true course of acquisition with making a reservation for
Course is compared, with determine user drive ship whether off-course, wherein, prearranged heading is by user according to actual heading need
Want default settings.
Reach predetermined angle in foregoing true course and prearranged heading deviation, and the duration that angular deviation occurs reaches the
One preset duration (setting of the present invention for first preset duration is not particularly limited, can by those skilled in the art according to
It is actually needed and is configured, for example, could be arranged to 5 seconds) when, judge that user drives ship off-course, the first alarm mould
First warning message of the block output prompting current off-course of user.Wherein, the first alarm module is exporting the first warning message
When, the first warning message can be exported by way of voice, image and/or vibration.
The security navigated by water for further ship-lifting, based on first embodiment, it is proposed that course display methods of the present invention
3rd embodiment, corresponding to the 3rd embodiment of foregoing course display device, in the present embodiment, the course display methods is also
Including：
Accumulative eye-closing period of the counting user in preset time period；
When the accumulative eye-closing period of statistics reaches the second preset duration, the second warning message is exported.
It should be noted that the difference of the present embodiment and aforementioned first embodiment is, this implementation adds tired navigation
Processing scheme, be only explained below, other can refer to the associated description of aforementioned first embodiment, no longer superfluous herein
State.
In embodiments of the present invention, course display device also includes the second alarm module, and second alarm module passes through intelligence
Energy glasses are set, and are detected towards the camera of user's glasses to whether user closes one's eyes, and counting user is in preset time
Section (setting of the present invention for the preset time period is not particularly limited, can by those skilled in the art according to be actually needed into
Row set, for example, could be arranged to 30 seconds) in accumulative eye-closing period, to determine whether user is currently tired navigation.
Reaching the second preset duration in the accumulative eye-closing period of statistics, (setting of the present invention for second preset duration is not
Concrete restriction is done, can be configured by those skilled in the art according to being actually needed, for example, could be arranged to 20 seconds) when, second
It is currently fatigue navigation that alarm module, which determines user, the second warning message of the current fatigue navigation of output prompting user.Wherein,
Two alarm modules can export the second alarm signal when exporting the second warning message by way of voice, image and/or vibration
Breath, the present invention are not particularly limited.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
- A kind of 1. course display methods, applied to intelligent glasses, it is characterised in that including：Obtain the geomagnetic field intensity at user's driving ship position；The magnetic heading of the ship is calculated according to the geomagnetic field intensity of acquisition；The magnetic heading of calculating is modified to obtain the true course of the ship, and shows the obtained true course.
- 2. course display methods as claimed in claim 1, it is characterised in that the magnetic heading of described pair of calculating is modified Obtaining the true course of the ship includes：Obtain the magnetic declination at the corresponding ship position；Using the magnetic declination and the magnetic heading and be worth the true course as the ship.
- 3. course display methods as claimed in claim 1, it is characterised in that described to obtain at the corresponding ship position Magnetic declination the step of include：It is determined that with city nearest at the ship position；It is according to default city and the corresponding relation of magnetic declination, magnetic declination corresponding to the city is in place as ship institute Put the magnetic declination at place.
- 4. the course display methods as described in claim any one of 1-3, it is characterised in that in the true course that display obtains While, also perform following steps：The true course is compared with prearranged heading；Reach predetermined angle in the true course and the prearranged heading deviation, and the duration that angular deviation occurs reaches the During one preset duration, the first warning message is exported.
- 5. the course display methods as described in claim any one of 1-3, it is characterised in that the course display methods is also wrapped Include：Accumulative eye-closing period of the counting user in preset time period；When the accumulative eye-closing period of statistics reaches the second preset duration, the second warning message is exported.
- 6. a kind of course display device, applied to intelligent glasses, it is characterised in that the course display device includes：Acquisition module, for obtaining the geomagnetic field intensity at user's driving ship position；Computing module, for calculating the magnetic heading of the ship according to the geomagnetic field intensity of acquisition；Display module, for being modified to obtain the true course of the ship to the magnetic heading of calculating, and show what is obtained The true course.
- 7. course display device as claimed in claim 6, it is characterised in that the display module is additionally operable to described in acquisition correspondingly Magnetic declination at ship position；It is additionally operable to true boat of using the magnetic declination and the magnetic heading and value as the ship To.
- 8. course display device as claimed in claim 6, it is characterised in that the display module is additionally operable to determine and the ship Nearest city at oceangoing ship position；The corresponding relation according to default city and magnetic declination is additionally operable to, the city is corresponding Magnetic declination as the magnetic declination at the ship position.
- 9. the course display device as described in claim any one of 6-8, it is characterised in that the course display device also includes First alarm module, for while the display module shows the obtained true course, by the true course and making a reservation for Course is compared；It is additionally operable to reach predetermined angle in the true course and the prearranged heading deviation, and angular deviation occurs Duration when reaching the first preset duration, export the first warning message.
- 10. the course display device as described in claim any one of 6-8, it is characterised in that the course display device is also wrapped The second alarm module is included, for accumulative eye-closing period of the counting user in preset time period；It is additionally operable to close in the accumulative of statistics When at the moment length reaches the second preset duration, the second warning message is exported.
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|---|---|---|---|
| CN201710290176.9A CN107421522A (en) | 2017-04-27 | 2017-04-27 | Course display methods and device |
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| CN201710290176.9A CN107421522A (en) | 2017-04-27 | 2017-04-27 | Course display methods and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111795673A (en) * | 2020-07-09 | 2020-10-20 | 杭州海康微影传感科技有限公司 | Azimuth angle display method and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20171201 |