CN106680856A - Low-power consumption positioning method based on periodical switch GPS - Google Patents
Low-power consumption positioning method based on periodical switch GPS Download PDFInfo
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- CN106680856A CN106680856A CN201611180300.8A CN201611180300A CN106680856A CN 106680856 A CN106680856 A CN 106680856A CN 201611180300 A CN201611180300 A CN 201611180300A CN 106680856 A CN106680856 A CN 106680856A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/48—Determining position by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
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Abstract
The invention discloses a low-power consumption positioning method based on a periodical switch GPS. The method comprises steps of (1) acquiring real-time three-dimensional acceleration speed projection information, and acquiring a positioning point of the current moment according to previous position point and the real-time three-dimensional acceleration speed projection information; (2) matching the positioning point to a proper road by use of the map matching method so as to obtain a matched positioning point; (3) judging whether a GPS positioning period is reached, if not, updating the GPS positioning period, and returning to the step (1) to continuously carry out positioning calculation, and if yes, open the GPS and entering the step (4); and (4) judging whether the GPS positioning is available, if yes, reading the position of the GPS and using the position as an initial positioning point and then returning to the step (1) to continuously carry out positioning calculation, and if not, returning to the step (1) to continuously carry out positioning calculation. According to the invention, by periodically starting the positioning function of the GPS, combining the positioning calculation of an accelerometer, and combining the map matching method to carry out road matching, it can be ensured that power consumption is reduced under the premise of ensuring the precision.
Description
Technical field
The invention belongs to field of locating technology, more particularly, to a kind of low-power consumption positioning based on periodic switch GPS
Method.
Background technology
With the continuous popularization of intelligent terminal (such as smart mobile phone, Intelligent bracelet, intelligent watch), terminal location is obtained
Through as a basic service, to Orientation on map, position navigation, location Based service (Location Based
Service) etc. basic condition is provided.
However, at present there are two great defects in the positioning of intelligent terminal.First, the power consumption of intelligent terminal positioning is very
Greatly, such as smart mobile phone can only support that Intelligent bracelet and intelligent watch etc. can only be supported not 5 hours to 6 small continuous GPS locations
To the continuous GPS location of half a day, so as to high-precision position acquisition and service and bring greatly challenge to terminal endurance.The
Two, intensive in some buildings or have the place blocked, such as city proper and walking shopping street place, gps satellite signal
Blocked by serious, often positioning fails or obtains the positioning result of mistake, the location-based service and application to upper strata bring
Inconvenience.
The main flow localization method for being provided on intelligent terminal at present has three kinds：GPS location, WIFI positioning and base station are fixed
Position.Wherein, GPS location precision highest, about 10 meters or so of fair weather；About tens meters of WIFI positioning precisions are needed to rice up to a hundred
Realize knowing position and the distribution situation of each AP focus；Architecture precision is worst, and usual hundreds of meters depends on to several kms
In base station signal strength and distribution situation.Main flow localization method is by GPS location, WIFI positioning, architecture this three fusion
Get up, if GPS location can be got, just directly use GPS location, otherwise positioned using WIFI, if WIFI is positioned
Have failed, then use architecture.That is, the preferred GPS location of this method, can cause the always on power consumptions of GPS very big；
If GPS location fails, alternative WIFI positioning and the precision of architecture are again not high enough.Obviously, these methods can not be fine
The ground treatment problem that positioning power consumption is higher and positioning precision is not high mentioned above.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of based on periodic switch GPS's
Low power targeting methods, its object is to pass through periodic switch GPS, obtain initial when GPS location function is opened by GPS
Anchor point, initial alignment point is obtained when GPS location function is closed by accelerometer, and the three-dimensional acceleration obtained according to acceleration
Degree projection information carries out positioning reckoning, so as to reduce power consumption in advance before positioning precision is ensured, thus solves in the prior art
The positioning technical problem that power consumption is higher and positioning precision is not high.
(1) the real-time three-dimensional acceleration projection information at each moment is obtained using accelerometer, and according to a upper anchor point
Real-time three-dimensional acceleration projection information with each moment obtains the anchor point at current time；
(2) anchor point at current time is matched on suitable road to reduce position error using map-matching method,
Anchor point after being matched；
(3) judge whether reach the GPS location cycle, if otherwise update the GPS location cycle, and go to step (1) continue into
Row positioning is calculated；If it is, opening GPS and going to step (4)；
(4) judge whether GPS location function can use, GPS location is read if available, GPS location is determined as initial
Site and go to step (1) proceed positioning calculate；(1) is gone to step if unavailable and proceeds positioning reckoning.
Map-matching method is utilized in one embodiment of the present of invention, in the step (2) by the anchor point at current time
Match on suitable road to reduce position error, anchor point after being matched, specially：
Obtain continuous N number of anchor point respectively in its two adjacent roads apart from Li1And Li2, wherein i=1-N, Li1Table
Show i-th anchor point to first distance of road, Li2I-th anchor point to the distance of another two roads is represented, N is nature
Number；
According to N number of anchor point respectively in its two adjacent roads apart from di1And di2, calculating will position point location
Probability K onto first road1With the probability K on Article 2 road2；
If the K1More than K2, then anchor point is navigated on first road, if the K1Less than K2, then will be fixed
Site is navigated on Article 2 road, if the K1Equal in K2, then the N+1 anchor point is obtained to two articles of adjacent roads
Apart from Li1And Li2, and calculate K1And K2Until K1It is not equal to K2。
In one embodiment of the present of invention, in initial alignment, if GPS location function is available, GPS location is read simultaneously
Using GPS location as initial alignment point；If GPS location function is unavailable, accelerometer position is read and by accelerometer
Position is used as initial alignment point.
In one embodiment of the present of invention, the k1=1/ (d11d21……dN1), k2=1/ (d12d22……dN2)。
In one embodiment of the present of invention, according to a upper anchor point and the real-time three-dimensional at each moment in the step (1)
Acceleration projection information obtains the anchor point at current time, is calculated with specific reference to following formula：
Wherein sx(t),sy(t),szT () is the location information at current time, (s'x0(t),s'y0(t),s'z0(t)) it is upper
The initial position at one moment, (a'x,a'y,a'z) be each moment real-time three-dimensional acceleration projection information.
In one embodiment of the present of invention, the real-time three-dimensional acceleration projection information is specially：
Wherein (ax,ay,az) it is the acceleration sampled value of accelerometer acquisition,
G is acceleration of gravity.
In one embodiment of the present of invention, the GPS location cycle is T=T0/ M, wherein T0It is error accumulation time threshold
Value, M goes out in-degree for present road.
In one embodiment of the present of invention, the T0It is one minute.
In one embodiment of the present of invention, the M values are the preceding number to road.
In general, by the contemplated above technical scheme of the present invention compared with prior art, with following beneficial effect
Really：
(1) the inventive method is by judging the opening of GPS location function, when GPS location function is closed by plus
Speed meter obtains initial alignment point, obtains initial alignment point by GPS when GPS location function is opened, and carry out ground to anchor point
Figure matching, the three-dimensional acceleration projection information for further being obtained with reference to acceleration carries out positioning reckoning, so as to ensure to position
Power consumption is reduced on the premise of precision；
(2) the inventive method is periodically opened GPS location function and combines the positioning reckoning of accelerometer such that it is able to because closing
Close GPS location function and reduce positioning power consumption, also GPS location function can be opened by periodicity and ensure positioning accurate higher
Degree；
(3) the inventive method goes out in-degree information and the calculating of default error accumulation time threshold according to present road
The GPS work periods, GPS is opened and closed according to the GPS work periods such that it is able to according to currently needing the specific of position location
Terrain information adjusts switch periods, further ensures low-power consumption with high-precision balance；
(4) the inventive method combination map-matching method carries out path adaptation, larger in the positioning result error for calculating
When, the real road information that can be combined on map carries out positioning correction, further improves positioning precision.
Brief description of the drawings
Fig. 1 is a kind of low power targeting methods schematic diagram in the embodiment of the present invention；
Fig. 2 is a kind of schematic flow sheet of the low power targeting methods based on periodic switch GPS in the embodiment of the present invention；
Fig. 3 is the structural representation of triaxial accelerometer in the embodiment of the present invention；
Fig. 4 is that the angle of triaxial accelerometer in the embodiment of the present invention defines schematic diagram；
Fig. 5 is the map match schematic diagram of location information in the embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples,
The present invention will be described in further detail.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.Additionally, technical characteristic involved in invention described below each implementation method is only
Not constitute conflict each other can just be mutually combined.
The invention provides a kind of localization method that power consumption can be reduced on the premise of positioning precision is ensured, such as Fig. 1 institutes
Show, main working process includes following aspect：
A, displacement are calculated：Integrated accelerometer perceives tri- changes of the acceleration in direction of X, Y, Z in terminal, in short-term
It is interior to be integrated, can just obtain the movement velocity and change in displacement of terminal.
B, GPS location and correction：If GPS location function can use, first by GPS location, GPS location is obtained.So
Afterwards, GPS location is matched on suitable road to reduce GPS error；Finally, the movement position to terminal is corrected, and carries
For a reliable position reference point.
C, low-power consumption positioning：It is fixed using accelerometer in order to reduce overall positioning power, it is necessary to be previously switched off GPS module
Position reduces power consumption.First, by map api interface, current map road vectors are loaded, according to present road complexity, meter
Suitable GPS unlatchings, shut-in time are calculated, the GPS work periods are updated.Secondly, in the GPS shut-in times, by reference by location spot projection
To map, map match is carried out.Finally, positioning is made of moving displacement and direction to calculate.This section of process is referred to as actively
Positioning.
D, position losing lock positioning：If GPS location fails, directly carry out map match and positioning is calculated, obtain present bit
Put.This section of process is referred to as Passive Positioning.
To achieve these goals, it is fixed the invention provides a kind of low-power consumption based on periodic switch GPS as shown in Figure 2
Position method, comprises the following steps：
(1) the real-time three-dimensional acceleration projection information at each moment is obtained using accelerometer, and according to a upper anchor point
Real-time three-dimensional acceleration projection information with each moment obtains the anchor point at current time；
Specifically, can on intelligent terminal integrated accelerometer, by calling the api function of accelerometer, read three axles and add
The value of the X, Y, Z axis of velocity sensor.Wherein, the direction of three axles is normally defined：X-axis points to left and right laterally, in Y-axis sensing
It is lower vertical, Z axis perpendicular to panel direction, as shown in Fig. 3.Welding position in view of accelerometer chip may be with actual side
To different.At this time, it may be necessary to carry out left and right, it is front and rear, move up and down, determine the corresponding direction of each axle；
The X, Y, Z axis direction of previous step collection is joined with the panel directional correlation of intelligent terminal, but in practical operation
In, intelligent terminal is not necessarily horizontal positioned, may have certain angle with horizontal plane.For example, terminal can be placed on hand by user
On, will there is certain angle with horizontal plane.Accordingly, it would be desirable to the X, Y, Z axis acceleration for collecting is projected on horizontal plane,
Preferably to perceive motion state change；
It is the definition of acceleration all angles shown in Fig. 4, the angle rotated around X-axis is generally defined as flip angle (Roll
Angle), the angle for being rotated around Y-axis is defined as the angle of pitch (Pitch angle), and the angle for rotating about the z axis orientates yaw angle as
(Yaw angle)；
In order to by acceleration sampled value (ax,ay,az) horizontal plane, vertical direction place space are projected to, it is necessary to first calculate
Angle of pitch p and flip angle r：
parc sin(-ax/g)
R=arc sin (ay/(g cos p))
Wherein, g is earth surface vertical direction acceleration constant 9.8m/s2；
So as to obtain the three-dimensional acceleration projection (a' in space where horizontal plane, vertical directionx,a'y,a'z) be：
Tri- changes of the acceleration in direction of X, Y, Z are perceived by integrated accelerometer on intelligent terminal, in short-term
It is interior to be integrated, can just obtain the movement velocity and change in displacement of terminal.
The acceleration in tri- directions of X, Y, Z is integrated twice, the change in location in direction where obtaining：
Wherein, wherein sx(t),sy(t),szT () is the location information at current time, (a'x,a'y,a'z) it is each moment
Real-time three-dimensional acceleration projection information；
(s'x0(t),s'y0(t),s'z0(t)) it is the anchor point of last moment, can be specifically in system startup optimization
When for the first time obtain anchor point, or the accelerometer when the GPS location cycle is not reached or GPS location function is unavailable
Anchor point, or the anchor point obtained using GPS location renewal when GPS location function is available.
(2) anchor point at current time is matched on suitable road to reduce position error using map-matching method,
Anchor point after being matched；
Averagely there are 10 meters of position errors GPS location position, the anchor point g (g for obtainingx,gy,gz) may not be just to fall
On road, typically can be near roads fluctuation, it is possible to use the method for map match, anchor point is matched into suitable road
On, reduce position error；
Specifically, obtain continuous N number of initial alignment point respectively in its two adjacent roads apart from Li1And Li2, wherein i
=1-N, Li1Represent i-th initial alignment o'clock to first distance of road, Li2Represent i-th initial alignment point to another two
The distance of road, N is natural number；
According to N number of initial alignment point respectively in its two adjacent roads apart from di1And di2, calculating will initially determine
Site navigates to the probability K on first road1With the probability K on Article 2 road2；
If the K1More than K2, then by initial alignment point location to first road, if the K1Less than K2, then
By on initial alignment point location to Article 2 road, if the K1Equal in K2, then the N+1 initial alignment o'clock to two is obtained
In bar adjacent road apart from Li1And Li2, and calculate K1And K2Until K1It is not equal to K2；
For example as shown in fig. 5, it is assumed that there is two road r1And r2, obtain continuous three location point p1, p2, p3.Due to existing
Some position errors, these three location points just do not fall in road r1And r2On.In order to determine that three location points should be at which
, it is necessary to carry out map match on one road.Specific matching algorithm is as follows：
First by three location point p1, p2, p3Respectively by two road r1And r2Projection line is done, each location point to two is obtained
Bar road r1And r2Distance be d11, d21, d31, d12, d22, d32.If intuitively it can be found that location point is apart from certain road
It is nearer, then more it is likely to be the point on the road.Therefore three location point p1, p2, p3In road r1On probability be respectively set to
1/d11,1/d21,1/d31.So as to three points are simultaneously in road r1On probability be k1=1/ (d11d21d31).Similarly, three points are same
When in road r2On probability be k2=1/ (d12d22d32)。
Compare two probability k1=1/ (d11d21d31) and k2=1/ (d12d22d32) size, if k1＞ k2Then think three
Individual point is all in road r1On, if k1＜ k2Then think three points all in road r2On.Especially, if k1=k2Then add new
Location point p4, recalculated according to above-mentioned aspect, until k1≠k2Untill.
The initial position of accelerometer is updated, that is, corrects accelerometer position s0(sx0,sy0,sz0)=g'(gx,gy,gz), wherein
g'(gx,gy,gz) it is the GPS location position after map match.Finally, GPS module is closed to reduce system energy consumption.
(3) judge whether reach the GPS location cycle, if otherwise update the GPS location cycle, and go to step (1) continue into
Row positioning is calculated；If it is, opening GPS and going to step (4)；
In embodiments of the present invention, in order to reduce overall positioning power, it is necessary to be previously switched off GPS module, using acceleration
Meter positions to reduce power consumption.
In order to reduce system power dissipation, it should open GPS less as far as possible, calculated using the relatively low accelerometer of power consumption.But,
Using integrating twice, the time is long to be had than larger accumulated error accelerometer, causes position error larger.And, if worked as
Preceding road is more complicated, for example, have very many turning situations, also can introduce new error to system.That is, GPS works
The complexity of cycle and accelerometer positioning intervals and present road is all closely related.
Specifically, it is assumed that by T0The accumulated error of time accelerometer just than larger, current road is obtained by map API
The in-degree that goes out on road is M, and this sets GPS work periods for T=T0/N.Wherein, T is typically taken0=1 minute.Before the value of M is set to
To the number of road, for example：If taking N=2 to there is two branch roads before road.
In embodiments of the present invention, in-degree information and default error accumulation time threshold can be gone out according to present road
Value calculates the GPS work periods, and GPS is opened and closed according to the GPS work periods；
If currently having arrived the GPS location cycle, go to step (4)；If being not at the GPS location cycle, it is continuing with
The positional information that accelerometer is obtained goes to step (1) as initial alignment point；
(4) judge whether GPS location function can use, GPS location is read if available, GPS location is determined as initial
Site and go to step (1) proceed positioning calculate；(1) is gone to step if unavailable and proceeds positioning reckoning.
If the GPS location cycle currently has been arrived, and GPS location function is available, then read GPS location g (gx,gy,gz) make
It is initial alignment point, and goes to step (1)；If GPS location function is unavailable, the position letter of accelerometer acquisition is continuing with
Breath goes to step (1) as initial alignment point.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should include
Within protection scope of the present invention.
Claims (9)
1. a kind of low power targeting methods based on periodic switch GPS, it is characterised in that methods described comprises the following steps：
(1) the real-time three-dimensional acceleration projection information at each moment is obtained using accelerometer, and according to a upper anchor point and respectively
The real-time three-dimensional acceleration projection information at moment obtains the anchor point at current time；
(2) anchor point at current time is matched on suitable road to reduce position error using map-matching method, is obtained
Anchor point after matching；
(3) judge whether to reach the GPS location cycle, if otherwise update the GPS location cycle, and go to step (1) proceed it is fixed
Position calculates；If it is, opening GPS and going to step (4)；
(4) judge whether GPS location function can use, GPS location is read if available, using GPS location as initial alignment point
And go to step (1) proceed positioning calculate；(1) is gone to step if unavailable and proceeds positioning reckoning.
2. the low power targeting methods of periodic switch GPS are based on as claimed in claim 1, it is characterised in that the step
(2) anchor point at current time is matched on suitable road to reduce position error using map-matching method in, is obtained
With rear anchor point, specially：
Obtain continuous N number of anchor point respectively in its two adjacent roads apart from Li1And Li2, wherein i=1-N, Li1Represent i-th
Individual anchor point is to first distance of road, Li2I-th anchor point to the distance of another two roads is represented, N is natural number；
According to N number of anchor point respectively in its two adjacent roads apart from di1And di2, calculate and anchor point navigated to the
Probability K on one road1With the probability K on Article 2 road2；
If the K1More than K2, then anchor point is navigated on first road, if the K1Less than K2, then anchor point is determined
Position on Article 2 road, if the K1Equal in K2, then distance of the N+1 anchor point to two articles of adjacent roads is obtained
Li1And Li2, and calculate K1And K2Until K1It is not equal to K2。
3. such as the low power targeting methods based on periodic switch GPS as claimed in claim 1 or 2, it is characterised in that
During initial alignment, if GPS location function is available, GPS location is read and using GPS location as initial alignment point；If GPS
Positioning function is unavailable, then read accelerometer position and using accelerometer position as initial alignment point.
4. the low power targeting methods of periodic switch GPS are based on as claimed in claim 2, it is characterised in that the k1=1/
(d11d21......dN1),k2=1/ (d12d22......dN2)。
5. the low power targeting methods of periodic switch GPS are based on as claimed in claim 1 or 2, it is characterised in that the step
Suddenly the real-time three-dimensional acceleration projection information in (1) according to a upper anchor point and each moment obtains the anchor point at current time,
Calculated with specific reference to following formula：
sx(t)=s'x0(t)+∫∫a'x(t) dt,
sy(t)=s'y0(t)+∫∫a'y(t)dt
sz(t)=s'z0(t)+∫∫a'z(t)dt
Wherein sx(t),sy(t),szT () is the location information at current time, (s'x0(t),s'y0(t),s'z0(t)) it is upper a period of time
The initial position at quarter, (a'x,a'y,a'z) be each moment real-time three-dimensional acceleration projection information.
6. the low power targeting methods of periodic switch GPS are based on as claimed in claim 1 or 2, it is characterised in that the reality
When three-dimensional acceleration projection information be specially：
Wherein (ax,ay,az) it is the acceleration sampled value of accelerometer acquisition,G is
Acceleration of gravity.
7. the low power targeting methods of periodic switch GPS are based on as claimed in claim 1 or 2, it is characterised in that described
The GPS location cycle is T=T0/ M, wherein T0It is error accumulation time threshold, M goes out in-degree for present road.
8. the low power targeting methods of periodic switch GPS are based on as claimed in claim 7, it is characterised in that the T0It is one
Minute.
9. the low power targeting methods of periodic switch GPS are based on as claimed in claim 7, it is characterised in that the M values
It is the preceding number to road.
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