CN104596501A - Dynamic map location correction method based on mobile geographic information platform - Google Patents

Abstract

The invention discloses a dynamic map location correction method based on a mobile geographic information platform. The method comprises the following steps: S1, beginning to correct a current position; S2, loading a recognizable base map of the current area; S3, designating a current position on the map by the user; S4, acquiring the coordinate of the current position by virtue of a device location module; S5, calculating three parameters by utilizing an inversion calculation method; S6, setting the three corrected parameters to a location system, and completing the location correction work. A rapid and efficient geographic position correction method can be provided for a mobile device, the correction parameter does not need to be preliminarily calculated and inputted by the user, three conversion parameters of two coordinate systems of a region can be automatically calculated and set into the system according to a coordinate point calculated by the device location module and a current location point designated by the user on the map, so that a purpose of dynamically correcting the location coordinate of the map at any time can be achieved.

Description

The dynamic antidote of a kind of Orientation on map based on movable geographic information platform

Technical field

The invention belongs to positive location technical field, be specifically related to the dynamic antidote of a kind of Orientation on map based on movable geographic information platform.

Background technology

At present, in portable positive location technical field, main study subject is realize locating based on GPS positioning system, and the geographic coordinate that its positioning system obtains is WGS-84 coordinate system; Certainly also have small part equipment based on the big-dipper satellite positioning system (BeiDou (COMPASS) Navigation Satellite System) etc. of Muscovite glonass system (Global Navigation Satellite System), China, but the coordinate that its location obtains is all based on the specific coordinate system of this system.In actual applications, the map that we load on the mobile apparatus may be based on Beijing coordinate systems in 1954 or Xi'an country earth coordinates in 1980, or may based in order to certain service needed in somewhere self-defining local coordinate system, the coordinate that positioning system can be caused to obtain for different coordinate systems correctly can not identify current actual positions on map, causes on map, locate inaccurate problem.

At present, for the relation that there is translation and rotation between different coordinates, the coordinate data that positioning of mobile equipment system is obtained is converted to the coordinate that oneself needs, first (One-Point Location equipment is generally three parameters must the conversion parameter between two kinds of coordinates, i.e. dx, dy, dz, other several parameters are defaulted as 0), and then be tied to geocentric coordinate system → geocentric coordinate by terrestrial coordinate and be tied to the conversion that process that geocentric coordinate system → geocentric coordinate is tied to earth coordinates completes coordinate figure, its principle as shown in Figure 1, as can be seen here, " change three parameters " and be the core place of whole process.Can be known by geodetic surveying theory, calculate the coordinate pair of the same name that this kind of parameter needs to obtain respectively two coordinate systems, then conversion parameter is calculated by complicated mathematical formulae, but to obtain such coordinate for domestic consumer be not easy thing, carry out complicated formula still more and resolve.

The fixed investment of existing portable positive location equipment ubiquity is large, very flexible, targeted strong, data acquisition amount is large, reference mark, target area needs defect that is known, complex manufacturing.Simultaneously, existing product all has high requirement to the positional precision at reference mark, target area and the movement velocity of mobile vehicle and platform stabilization etc. thereof, make to obtain under high dynamic mobile carrier platform condition to arrive reference mark, target area spatial positional information, especially when equipment user is inaccurate in outdoor discovery location, when namely there is error in conversion parameter, the carrying out of positioning work can be badly influenced, therefore how to carry out efficiently, easily the elements of a fix correct be current faced key issue.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of Orientation on map based on movable geographic information platform dynamic antidote, the invention solves problems of the prior art, user only needs the identifiable design base map loading this area when outdoor, base map is reassigned current device position, conversion three parameter of Automatic solution this area, obtains current correct geographic position.

In order to solve the problems of the technologies described above, the present invention realizes in the following manner:

The dynamic antidote of Orientation on map based on movable geographic information platform, specifically comprises the following steps:

S1: the coordinate system that the coordinate system of current device loading data and equipment positioning system adopt is inconsistent, starts to correct current position;

S2: user loads the base map data that residing current region can identify voluntarily on equipment, such as satellite image, electronic chart etc.;

S3: the base map that user loads in S2 step is specified the position coordinate value M (L of region residing for current device on map ₀, B ₀, H ₀);

S4: resolved the particular location coordinate figure N (L obtaining region residing for current device by the locating module in equipment ₁, B ₁, H ₁);

S5: the conversion realizing coordinate, by the position coordinate value M (L obtained in step s3 ₀, B ₀, H ₀) and step S4 in the position coordinate value N (L that obtains ₁, B ₁, H ₁) convert Descartes's geocentric coordinate M to ₁and N ₁after, utilize anti-resolving Algorithm to change three parameters;

S6: after equipment user positions, calculates and obtains three parameters after correcting;

S7: by three parameter designing after rectification to positioning system, completes location rectification work.

Wherein, the position coordinate value M (L of region residing for designated equipment on map in described step S3 ₀, B ₀, H ₀) mode respectively: one is that user's drag and drop icon on screen is specified, and two is draw " cross " fork in screen center, and user moves map, makes " cross " pitch the heart and aims at and need the position of specifying.

Compared with prior art, the beneficial effect that the present invention has: the present invention for mobile device provide one fast, geographic position bearing calibration efficiently, do not need user to precalculate, input rectification parameter, the current location point that the coordinate points only resolved according to equipment locating module and user specify on map automatically calculates conversion three parameter of two kinds of coordinate systems of this area and is set in system, thus reaches the object of dynamically correcting Orientation on map coordinate at any time.

Accompanying drawing explanation

Fig. 1 is transfer principle schematic diagram between coordinate system;

Fig. 2 is workflow schematic diagram of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the specific embodiment of the present invention is described in further detail.

As shown in Figure 2, the dynamic antidote of a kind of Orientation on map based on movable geographic information platform, specifically comprises the following steps:

S1: the coordinate system that the coordinate system of current device loading data and equipment positioning system adopt is inconsistent, starts to correct current position;

S2: user loads the base map data that residing current region can identify voluntarily on equipment, such as satellite image, electronic chart etc.;

S3: the base map that user loads in S2 step is specified the position coordinate value M (L of region residing for current device on map ₀, B ₀, H ₀);

S4: resolved the particular location coordinate figure N (L obtaining region residing for current device by the locating module in equipment ₁, B ₁, H ₁);

S5: the conversion realizing coordinate, by the position coordinate value M (L obtained in step s3 ₀, B ₀, H ₀) and step S4 in the position coordinate value N (L that obtains ₁, B ₁, H ₁) convert Descartes's geocentric coordinate M to ₁and N ₁after, utilize anti-resolving Algorithm to change three parameters;

S6: after equipment user positions, calculates and obtains three parameters after correcting;

S7: by three parameter designing after rectification to positioning system, completes location rectification work.

The concrete steps realizing the conversion of coordinate in described step S5 comprise following step:

S51: first by position coordinate value M (L ₀, B ₀, H ₀) and N (L ₁, B ₁, H ₁) according to formula (1), longitude L, latitude B and elevation H are converted to the M of Cartesian coordinates (X, Y, Z) ₁and N ₁;

X＝(T+H)cosLcosB

Y＝(T+H)cosLsinB (1)

Z＝[T(1-e ²)+H]sinB

In formula, e is respective coordinates system eccentricity of ellipsoid, and a is semimajor axis of ellipsoid;

S52: the following aspects utilizing Two coordinate system to show under cartesian coordinate system is different: (I) true origin is different; (II) direction of coordinate axis is different; (III) spheroid-like and physical dimension difference, be reduced to transformation model " 3 parameter model ", obtain formula (2);

${\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]}_{M_1}={\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]}_{N_1}+\left[\begin{array}{c}\mathrm{dX}\\ \mathrm{dY}\\ \mathrm{dZ}\end{array}\right]---\left(2\right)$

In formula, dX, dY, dZ are three translation parameterss, and unit is m;

S53: formula (2) is transformed into formula (3):

$\left[\begin{array}{c}\mathrm{dX}\\ \mathrm{dY}\\ \mathrm{dZ}\end{array}\right]={\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]}_{M_1}-{\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]}_{N_1}---\left(3\right)$

The coordinate figure M simultaneously will obtained in step S51 ₁, N ₁bring in formula (3), utilize anti-resolving Algorithm to obtain dX, dY, dZ tri-conversion parameters.

Specific implementation process for step S6 is:

Equipment user calculates terrestrial coordinate N in earth-fixed co-ordinate system utilizing formula (4) ₃(B, L, H);

$B=\arctan \left[\tan S(1+\frac{{\mathrm{ae}}^2}{Z}\frac{\sin B}{\sqrt{{1-e}^2{\sin }^{2}B}})\right]$

$L=\arctan =\frac{Y}{X}---\left(4\right)$

$H=\frac{R\cos S}{\cos B}-T$

In formula, $S=\sqrt{X^2+Y^2+Z^2}$

Formula (1) is utilized to calculate geocentric coordinate N ₁, formula (2) calculates the geocentric coordinate N in earth-fixed co-ordinate system ₂, calculate institute obtain rectification after Orientation on map coordinate, namely complete the rectification of the moving map elements of a fix.

The above is only embodiments of the present invention; again state, for those skilled in the art, under the premise without departing from the principles of the invention; can also carry out some improvement to the present invention, these improvement are also listed in the protection domain of the claims in the present invention.

Claims (4)

1., based on the dynamic antidote of Orientation on map of movable geographic information platform, it is characterized in that: specifically comprise the following steps:

S1: the coordinate system that the coordinate system of current device loading data and equipment positioning system adopt is inconsistent, starts to correct current position;

S2: user loads the base map data that residing current region can identify voluntarily on equipment;

S3: the base map that user loads in S2 step is specified the position coordinate value M (L of region residing for current device on map ₀, B ₀, H ₀);

S4: resolved the particular location coordinate figure N (L obtaining region residing for current device by the locating module in equipment ₁, B ₁, H ₁);

S5: the conversion realizing coordinate, by the position coordinate value M (L obtained in step s3 ₀, B ₀, H ₀) and step S4 in the position coordinate value N (L that obtains ₁, B ₁, H ₁) convert Descartes's geocentric coordinate M to ₁and N ₁after, utilize anti-resolving Algorithm to change three parameters;

S6: after equipment user positions, calculates and obtains three parameters after correcting;

S7: by three parameter designing after rectification to positioning system, completes location rectification work.

2. the dynamic antidote of a kind of Orientation on map based on movable geographic information platform according to claim 1, is characterized in that: the position coordinate value M (L of region residing for designated equipment on map in described step S3 ₀, B ₀, H ₀) mode respectively: one is that user's drag and drop icon on screen is specified, and two is draw " cross " fork in screen center, and user moves map, makes " cross " pitch the heart and aims at and need the position of specifying.

3. the dynamic antidote of a kind of Orientation on map based on movable geographic information platform according to claim 1, is characterized in that:

The concrete steps realizing the conversion of coordinate in described step S5 comprise following step:

S51: first by position coordinate value M (L ₀, B ₀, H ₀) and N (L ₁, B ₁, H ₁) according to formula (1), longitude L, latitude B and elevation H are converted to the M of Cartesian coordinates (X, Y, Z) ₁and N ₁;

X＝(T+H)cosLcosB

Y＝(T+H)cosLsinB (1)

Z＝[T(1-e ²)+H]sinB

In formula, e is respective coordinates system eccentricity of ellipsoid, and a is semimajor axis of ellipsoid;

S52: the following aspects utilizing Two coordinate system to show under cartesian coordinate system is different: (I) true origin is different; (II) direction of coordinate axis is different; (III) spheroid-like and physical dimension difference, be reduced to transformation model " 3 parameter model ", obtain formula (2);

${\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]}_{M_1}={\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]}_{N_1}+\left[\begin{array}{c}\mathrm{dX}\\ \mathrm{dY}\\ \mathrm{dZ}\end{array}\right]---\left(2\right)$

In formula, dX, dY, dZ are three translation parameterss, and unit is m;

S53: formula (2) is transformed into formula (3):

$\left[\begin{array}{c}\mathrm{dX}\\ \mathrm{dY}\\ \mathrm{dZ}\end{array}\right]={\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]}_{M_1}-{\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]}_{N_1}---\left(3\right)$

The coordinate figure M simultaneously will obtained in step S51 ₁, N ₁bring in formula (3), utilize anti-resolving Algorithm to obtain dX, dY, dZ tri-conversion parameters.

4. the dynamic antidote of a kind of Orientation on map based on movable geographic information platform according to claim 1, is characterized in that:

The specific implementation process of described step S6 is:

Equipment user calculates terrestrial coordinate N in earth-fixed co-ordinate system utilizing formula (4) ₃(B, L, H);

$B=\arctan \left[\tan S(1+\frac{{\mathrm{ae}}^2}{Z}\frac{\sin B}{\sqrt{1-e^2{\sin }^{2}B}})\right]$

$L=\arctan \frac{Y}{X}---\left(4\right)$

$H=\frac{R\cos S}{\cos B}-T$

In formula, $S=\sqrt{X^2+Y^2+Z^2}$

Formula (1) is utilized to calculate geocentric coordinate N ₁, formula (2) calculates the geocentric coordinate N in earth-fixed co-ordinate system ₂, calculate institute obtain rectification after Orientation on map coordinate, namely complete the rectification of the moving map elements of a fix.