CN102740457A

CN102740457A - Method for preventing drift of mobile positioning of terminal

Info

Publication number: CN102740457A
Application number: CN201210208565XA
Authority: CN
Inventors: 吕奇勇; 李瑞峰; 张进科
Original assignee: NINGBO BODAO CO Ltd
Current assignee: NINGBO BODAO CO Ltd
Priority date: 2012-06-21
Filing date: 2012-06-21
Publication date: 2012-10-17

Abstract

The invention discloses a method for preventing the drift of the mobile positioning of a terminal, which is characterized by comprising the following steps of: (1) obtaining one-time current longitude and latitude coordinates, current speed and current time within specified time; (2) carrying out the following operation on the current longitude and latitude coordinates, the current speed, the current time, longitude and latitude coordinates obtained at the last time, speed obtained at the last time and time obtained at the last time: calculating the distance between the two-time longitude and latitude coordinates/the difference value of the two-time time so as to obtain a speed value running between the longitude and latitude coordinates obtained currently and the longitude and latitude coordinates obtained at the last time; comparing the speed value obtained by calculation and a preset value; and (3) repeating the steps (1) and (2). The uncertain drift data of the longitude and latitude coordinates can be eliminated by adopting the operational comparison of current data and last data to ensure the reliability and the smoothness of the data of the longitude and latitude coordinates so as to ensure the normal use of the terminal.

Description

The method of the anti-drift of a kind of terminal running fix

Technical field

The present invention relates to a kind of localization method of terminal, the method for the anti-drift of especially a kind of terminal running fix.

Background technology

The positioning principle of GPS is exactly to utilize satellite and the satellite of spatial distribution and topocentricly draw ground point location apart from intersection; It is the signal that GPS receiver synchronization receives 4 above gps satellite emissions; Measure these satellites in the position of this moment and they respectively to the distance of this GPS receiver, utilize position and the receiver clock correction of calculating receiver apart from intersection in view of the above.

Different according to the motion state of receiver in operation, localization method can be divided into: 1, static location, and promptly in position fixing process, receiver is put the position relatively on every side and is not changed on test point; 2, Kinematic Positioning, promptly in position fixing process, receiver is kept in motion.

By on can know; The mobile terminal device of band GPS receiver is when obtaining gps data, and is because various abnormal cause might obtain some unusual data, too fast like the moving velocity of terminal of Kinematic Positioning; To such an extent as to the response time of GPS is shorter than the current speed of service, drift appears; The place and for example intensive at pile or weather condition is bad because gps signal causes signal errors through repeatedly folding, reflection, drift occurs.When drift takes place in terminal positioning, can cause interference to user's use, vehicle GPS for example, the road on elements of a fix data and the electronic chart is not inconsistent, and occurs vehicle ' probably in architectural situation, has influenced normal use.

Summary of the invention

Technical problem to be solved by this invention provides the method that a kind of locator data is reliable and level and smooth, guarantee the anti-drift of the normal terminal running fix of using.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: the method for the anti-drift of a kind of terminal running fix, it is characterized in that, and comprise the steps:

1) in official hour, obtains once current latitude and longitude coordinates, present speed and current time;

2) with current latitude and longitude coordinates, present speed and current time and the last latitude and longitude coordinates that obtains, speed and the time intercropping following computing: the difference of the distance between twice the latitude and longitude coordinates/twice time obtains operating in the velocity amplitude between the latitude and longitude coordinates that the current latitude and longitude coordinates of obtaining and last time obtain; This velocity amplitude that calculates and preset value are compared, and a) this velocity amplitude then is judged as current latitude and longitude coordinates and drifts about greater than the first bigger preset value of speed, does not write down the data of obtaining; B) this velocity amplitude then is judged as the terminal and remains static less than the second less preset value of speed, does not write down the data of obtaining; C) this velocity amplitude then writes down current latitude and longitude coordinates, present speed and current time and demonstration to inform the user between first preset value and second preset value;

3) repeating step 1) and 2).

Wherein, In step 1), the acquisition methods of current latitude and longitude coordinates is that every certain interval of time obtains the latitude and longitude coordinates data one time; Get odd number altogether; Calculate each latitude and longitude coordinates with respect to the distance between first latitude and longitude coordinates of obtaining, the above-mentioned range data of odd number is sorted, the latitude and longitude coordinates of a distance correspondence in the middle of getting is as current latitude and longitude coordinates.

Compared with prior art; The invention has the advantages that: adopt current data and preceding secondary data to carry out computing relatively; Can eliminate the uncertain drift data of latitude and longitude coordinates, to guarantee the reliability and the flatness of latitude and longitude coordinates data, to guarantee the normal use at terminal.

Description of drawings

Fig. 1 is the flow chart of anti-bleach-out process of the present invention.

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Referring to Fig. 1, the method for the anti-drift of a kind of terminal running fix comprises the steps:

1) in official hour,, obtains once current latitude and longitude coordinates, present speed and current time, wherein like 10s; The acquisition methods of current latitude and longitude coordinates can be certain interval of time; Like 50ms, obtain the longitude and latitude data one time, get altogether 5 times; Obtain 5 GPS latitude and longitude coordinates data,, promptly calculate the distance of back four latitude and longitude coordinates respectively with respect to first latitude and longitude coordinates with these 5 latitude and longitude coordinates data computation relative distances; Obtain 5 range data (the corresponding distance of first latitude and longitude coordinates is 0), above-mentioned 5 range data are sorted, the latitude and longitude coordinates of a range data correspondence in the middle of getting is as this latitude and longitude coordinates;

2) with current latitude and longitude coordinates, present speed and current time and the last latitude and longitude coordinates that obtains, speed and the time intercropping following computing: the difference of the distance between twice the latitude and longitude coordinates/twice time obtains operating in the velocity amplitude between the latitude and longitude coordinates that the current latitude and longitude coordinates of obtaining and last time obtain; This velocity amplitude that calculates and preset value are compared, a) like this velocity amplitude greater than the first bigger preset value of speed, like 50m/s, then be judged as current latitude and longitude coordinates and drift about, do not write down the data of obtaining; B) like this velocity amplitude less than the second less preset value of speed, like 0.5m/s, then be judged as the terminal and remain static, do not write down the data of obtaining; C) like this velocity amplitude between first preset value and second preset value, then write down current latitude and longitude coordinates, present speed and current time and show to inform the user;

3) repeating step 1) and 2).

Can eliminate the uncertain drift data of latitude and longitude coordinates thus, to guarantee the reliability and the flatness of latitude and longitude coordinates data, to guarantee the normal use at terminal.

The above is merely preferred implementation of the present invention, should be pointed out that for those of ordinary skill in the art, not breaking away under the principle prerequisite of the present invention, can also make various deformation and improvement, and this also should be regarded as protection scope of the present invention.

Claims

1. the method for the anti-drift of terminal running fix is characterized in that, comprises the steps:

3) repeating step 1) and 2).

2. the method for the anti-drift of terminal as claimed in claim 1 running fix; It is characterized in that the acquisition methods of current latitude and longitude coordinates is that every certain interval of time obtains the latitude and longitude coordinates data one time; Get odd number altogether; Calculate each latitude and longitude coordinates with respect to the distance between first latitude and longitude coordinates of obtaining, the above-mentioned range data of odd number is sorted, the latitude and longitude coordinates of a distance correspondence in the middle of getting is as current latitude and longitude coordinates.