CN101938831B - The dynamic adjusting method of location frequency - Google Patents
The dynamic adjusting method of location frequency Download PDFInfo
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- CN101938831B CN101938831B CN201010272796.8A CN201010272796A CN101938831B CN 101938831 B CN101938831 B CN 101938831B CN 201010272796 A CN201010272796 A CN 201010272796A CN 101938831 B CN101938831 B CN 101938831B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
A dynamic adjusting method for location frequency, comprising: perform one-time positioning process, obtains locating information; According to the mobile factor of described locating information determination locator; The time interval of location next time is calculated according to described mobile factor.Described mobile factor comprises: translational speed, moving direction, mobile alignment.Described mobile factor adopts following manner to combine: Δ t=(a1 Δ t1+a2 Δ t2+a3 Δ t3)/(a1+a2+a3); Δ t arrives next positioning intervals for what will adopt; Δ t1, Δ t2 and Δ t3 are respectively the time interval to location next time of counting out respectively according to translational speed, moving direction, mobile alignment; A1, a2 and a3 are weighted value coefficient.Use the present invention, under accurate positioning prerequisite can be realized, reduce the power consumption of locator.
Description
Technical field
The present invention relates to field of locating technology, refer to a kind of dynamic adjusting method of location frequency especially.
Background technology
ZigBee technology is the wireless network communication technique of a kind of short distance, low data rate, low-power consumption.As Fig. 1 shows the network diagram realizing wireless location based on ZigBee-network.Comprise the base station being arranged on diverse location (as community's diverse location), the radio positioner of radio communication can be carried out with base station.Wherein, locator can be carried by mobile object (as user), thus realizes the location to this mobile object.
Positioning flow as shown in Figure 2 illustrates this concrete position fixing process, comprise: the locator cycle sends 8 broadcast singals, and receive the response signal of at least three base stations, select three base stations that signal energy is the strongest according to the energy of received response signal, then go out the positional information of this locator according to the positional information calculation of the energy size of response signal, spread index and three base stations.Wherein, above-mentioned positioning flow performed at interval of a period of time (i.e. fixed cycle/frequency).Patent application as Chinese Patent Application No. position 200720029730.X and 200820111002.8 discloses above-mentioned localization method.
Radio positioner is carried by user, employing be powered battery, therefore need the prerequisite ensureing accurate positioning at locator under, reduce its power consumption and reduce power consumption for extremely important locator.
Summary of the invention
In view of this, main purpose of the present invention is the dynamic adjusting method providing a kind of location frequency, to reduce the power consumption of locator under realizing accurate positioning prerequisite.
The method of adjustment of location frequency provided by the invention, comprises step:
A, execution one-time positioning process, obtain locating information;
B, mobile factor according to locating information determination locator;
C, according to mobile factor calculate next time location the time interval.
By upper, can realize, to the change in the time interval of location next time, namely adjusting location frequency, to reduce the power consumption of locator under realizing accurate positioning prerequisite.
Optionally, described mobile factor comprises one of following or combines arbitrarily: translational speed, moving direction, mobile alignment.
By upper, one of aforesaid way or combination can be adopted to adjust location frequency.
Optionally, described mobile factor adopts following manner to combine: Δ t=(a1 Δ t1+a2 Δ t2+a3 Δ t3)/(a1+a2+a3); Δ t arrives next positioning intervals for what will adopt; Δ t1, Δ t2 and Δ t3 are respectively the time interval to location next time of counting out respectively according to translational speed, moving direction, mobile alignment; A1, a2 and a3 are weighted value coefficient.
By upper, by weighted value coefficient, can be implemented in when location frequency is adjusted, by different weight to above-mentioned translational speed, moving direction, the adopting of mobile alignment factor.
Wherein, when described mobile factor is translational speed; Step B is: according to the previous and current position location of locator, previous time interval compute location device translational speed of locating with this, distance/twice time interval of this translational speed=twice position; Step C is: the time interval short length calculating location next time according to the speed of described translational speed.
By upper, locator translational speed speed can be calculated especially by the information of twice location, to calculate the time interval short length of location next time.
Optionally, step C comprises: when translational speed is lower than the first preset value, and select this interval value corresponding one longer time interval is as the time interval performing next position fixing process; When translational speed is higher than the second preset value, select this interval value corresponding one shorter time interval is as the time interval performing next position fixing process; When translational speed is between first, second preset value, select this interval value corresponding one normal time interval as performing time interval of next position fixing process.
By upper, the mode of piecewise function can be adopted to realize calculating according to locator translational speed speed the time interval short length of location next time easily.
Optionally, the following formula of employing is calculated described in step C: Δ t=f (v); Δ t is the time interval to location next time; V is translational speed; F is a curvilinear function.
By upper, continuous function can be adopted to realize calculating according to locator translational speed speed the time interval short length of location next time.Under locator high speed situation of movement, when speed raises a little, Δ t can raise fast (showing as slope to increase), to realize the timely location in short time Large travel range situation at high speeds.
Wherein, when described mobile factor is moving direction; Step B for: the straight line formed according to the position location of twice before storing, judges the error of position on described straight line when prelocalization; Step C is: the time interval short length calculating location next time according to described error size.
By upper, the determination that can realize moving direction by front twice locating information, thus according to the time interval short length that the error calculation of the position when prelocalization on described straight line was located to next time.
Optionally, when described error is less than a particular value, also comprise: according to the previous and current position location of locator, previous time interval compute location device translational speed of locating with this, distance/twice time interval of this translational speed=twice position; Before execution location next time, according to above-mentioned translational speed, described current location, described rectilinear direction, and position to be reported to arrive the described current time interval, calculate the position that this reports the locator in position moment.
By upper, can realize when the time interval is longer, be when rectilinear direction continues to run, before arrival performs next position fixing process, adopt the mode of above-mentioned soft location, the mode namely calculated, continue to user the positional information that locator is provided.
Wherein, when described mobile factor is mobile alignment; Step B is: judge that running route is the distance size to next route branch according to current position location, map track data; Step C is: the time interval length calculating location next time according to described distance size.
By upper, twice locating information can be passed through.Map track data determines the distance size of next route branch, calculates the time interval length of location next time according to described distance size.
Optionally, when the described distance to next route branch is greater than a particular value, also comprise: the motion track that previous and current position location and map track data obtain according to locator calculates the path length between two position locations, again in conjunction with previous and current time interval compute location device translational speed, this translational speed=described path length/time interval; Before execution location next time, according to above-mentioned translational speed, described current location, described map track data, and position to be reported to arrive the described current time interval, calculate the position that this reports the locator in position moment.
By upper, can realize when the time interval is longer, time namely far away apart from next branch, before arrival performs next position fixing process, adopt the mode of above-mentioned soft location, the mode namely calculated, continue to user the positional information that locator is provided.
Accompanying drawing explanation
Fig. 1 is the network diagram realizing location based on ZigBee-network;
Fig. 2 is the positioning flow figure of existing fixed cycle;
Fig. 3 is the positioning flow figure adjusted location frequency according to locator translational speed;
Fig. 4 is the curvilinear function figure in the time interval of location;
Fig. 5 is the positioning flow figure adjusted location frequency according to locator moving direction;
Fig. 6 is the positioning flow figure adjusted location frequency according to locator shiftable haulage line.
Embodiment
The present invention, by the execution position fixing process of fixed frequency, changes to the execution position fixing process of dynamic frequency.Specifically, judging the condition triggered, when meeting triggered condition, positioning the adjustment of frequency, be i.e. the time interval of change location next time.These trigger conditions comprise the change of the change of locator translational speed, the change of moving direction and mobile alignment.Wherein, above-mentioned trigger condition can be used alone, and also can be combined.The present invention is described in detail respectively below.
As Fig. 3 shows the positioning flow figure adjusted location frequency according to the speed of locator movement, comprise the following steps:
Step 31, execution one-time positioning process, determine locator current location.This step see the flow process shown in Fig. 2, can repeat no more herein.
Step 32, position calculation when to perform location according to locator current location, locator last time of recording go out the distance of two positions, the time interval of twice execution location is gone out, then 1 translational speed calculating locator according to the following equation according to locator current time, the Time Calculation performing locator last time location that records:
Translational speed=distance/time interval (1)
Step 33, to perform according to the adjustment of the speed of speed next time location with this time interval of locate, namely adjustment performs the frequency of locating.Be specially:
When translational speed is lower than certain preset value a (i.e. the first preset value), represent that the speed of carrying user's movement of this locator is slow, such as carrying the elderly or pedestrian etc. of this locator, the time interval that now then selection one is longer, as the time interval performing next position fixing process, namely reduces the frequency performing location;
When translational speed is higher than certain set point b (i.e. the second preset value), represent that the speed ratio of carrying user's movement of this locator is very fast, such as carrying motorcycle, the automobile of this locator, the time interval that now then selection one is shorter, as the time interval performing next position fixing process, namely improves the frequency performing location;
When translational speed is between set point a and b, then using one normal time interval as performing time interval of next position fixing process; Namely the frequency performing location is maintained.
The mode that above-mentioned example have employed piecewise function sets translational speed corresponding three time intervals of third gear, and be understood that, what can divide as required is thinner.Or adopt the mode of a continuous function, as Δ t=f (v), wherein Δ t represents that next time performs the time interval of location, v represents the translational speed calculated, f represents a continuous function, thus the length that can realize positioning intervals at any time translational speed carry out real-time dynamic change soon slowly.Wherein Δ t=f (v) can be direct proportion function, can be also curvilinear function as shown in Figure 4, adopts the feature of this Fig. 4 curvilinear function to be: move lower Δ t in locator low velocity and change comparatively slow, and Δ t changes very fast under high speed moves.As shown in Figure 4, under locator high speed situation of movement, when speed raises a little, Δ t can raise fast (showing as slope to increase), to realize the timely location in short time Large travel range situation at high speeds.
By upper, because the frequency dynamic performing location changes, thus also can upgrade locating information faster when using object move speed fast, when using object move speed slow, extend framing signal transmission time interval, reach the object of the power saving on accurate positioning basis.
Whether be the positioning flow figure that straight line adjusts location frequency as Fig. 5 shows according to the direction of locator movement.Adopt in this way, there is straight line at the uniform velocity or the situation of approximate at the uniform velocity movement based on the mobile object carrying locator, therefore, the translational speed combination that can be calculated according to above-mentioned steps 32 by the corresponding software in locator provides the time of positional information and rectilinear movement telegoniometer to calculate the position after certain hour to user next time, owing to being that software calculates, also can be described as soft location.Can avoid initiating a position fixing process as shown in Figure 2 by soft location, thus reduce power consumption.Consider that again error and user's moving direction of soft location can not always remain unchanged, rectilinear motion is to next positioning intervals therefore to need combination to determine whether, namely location frequency adjusts.This positioning flow specifically comprises the following steps:
Step 51 ~ step 52: identical with step 31 ~ step 32, repeats no more.
Whether still step 53: according to positional information, the current location information of twice before storing, locator judges that current location is in the error size on straight line that front twice position form on (allowing certain error), namely judge the possibility of user's maintenance rectilinear motion.
Step 54: (namely more big error is larger away from the distance of described straight line according to error, or the straight line that in current location and front twice position, the time is once formed more for a long time and the angle that above-mentioned straight line is formed more big error is larger,) size adjustment performs next location and this performs the time interval of locating short length, namely adjustment performs the frequency of locating.Be specially:
When judging that current location is in error on straight line that front twice position form more hour, represent that the tendency of user's rectilinear motion is larger, then select longer time interval as the time interval performing next position fixing process, namely reduce the frequency performing and locate; Otherwise, represent that user changes the direction of motion, when especially error is larger, then improve the frequency performing location.Further, when the frequency of locating is lower, before arrival performs next position fixing process, the mode of above-mentioned soft location is adopted to continue to provide the positional information of locator to user.
Function wherein also can be adopted to determine the time interval, as can function be adopted: Δ t=f (r); Δ t is the time interval to location next time; R is error size; F can be the curvilinear function of.The principle function class corresponding with Fig. 4 seemingly, repeats no more.
As Fig. 6 shows the positioning flow figure adjusted location frequency according to the circuit of locator movement.This mode needs figure track data in combination, wherein map track data can be provided by map track data provider (the map track data that such as map track data provider is supplied to GPS navigator), its principle is that the removable track of the mobile object of locator is carried in track data prediction according to the map, whether i.e. mobile alignment, exist branch road (namely whether only having forward-reverse and there is not the route turned to) according to user's mobile alignment and adjust location frequency.This process specifically comprises the following steps:
Step 61, identical with step 31, repeat no more.
Step 62: (mainly consider the situation that there is on-rectilinear movement according to the motion track that position when performing locator current location, locator last time of recording location and map track data obtain, therefore figure track data can obtain the length of the route between 2 in combination, but not air line distance) calculate path length between two positions, the time interval of twice execution location is gone out, then 2 translational speeds calculating locator according to the following equation according to locator current time, the Time Calculation performing locator last time location that records:
Translational speed=path length/time interval (2)
Step 63: locator according to current location information and map track data, judge the size of mobile alignment front near branch road;
Step 64: perform the time interval length of locating according to the described adjustment of the size near branch road distance location next time with this, specifically comprise:
Described distance is less, then represent that the possibility that route of user mobile trend changes is comparatively large, then the time interval that selection one is shorter, as the time interval performing next position fixing process, namely improves the frequency performing location; Otherwise, think that user can continue by this route mobile, then reduce the frequency performing location.Further, when the frequency of locating is lower, before arrival performs next position fixing process, the circuit of figure track data adopts the mode of above-mentioned soft location to continue to user the positional information providing locator in combination.
Function wherein also can be adopted to determine the time interval, as can function be adopted: Δ t=f (d); Δ t is the time interval to location next time; D is the distance that current location arrives branch road; F can be the curvilinear function of.The principle function class corresponding with Fig. 4 seemingly, repeats no more.
In addition, above-mentioned several method can be used alone, and also can be combined arbitrarily, such as, can be combined by above several method by following manner:
Suppose that arrival positioning intervals next time calculated respectively according to above-mentioned three kinds of methods of location frequency adjustment is Δ t1, Δ t2 and Δ t3, following formula 3 so can be adopted to calculate next positioning intervals:
Δt＝(a1Δt1+a2Δt2+a3Δt3)/(a1+a2+a3) (3)
Wherein, Δ t is the next positioning intervals calculated, and a1, a2 and a3 are weighted value coefficient, can value be not less than zero number.
As above formula 3, when weighted value coefficient a1 and a2 is zero, is exactly the frequency adjusting method representing the only location that employing a3 is corresponding in fact.When a1 is zero, then represent the combination of the frequency adjusting method of the two kinds of location only adopting a2 and a3 corresponding.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a dynamic adjusting method for location frequency, is characterized in that, comprises step:
A, execution one-time positioning process, obtain locating information;
B, mobile factor according to described locating information determination locator; Described mobile factor comprises: translational speed, moving direction, mobile alignment;
C, the time interval adopting following formulae discovery to locate to next time according to described mobile factor:
△t＝(a1△t1+a2△t2+a3△t3)/(a1+a2+a3)；
△ t arrives next positioning intervals for what will adopt; △ t1, △ t2 and △ t3 are respectively the time interval to location next time calculated respectively according to translational speed, moving direction, mobile alignment; A1, a2 and a3 are weighted value coefficient;
Wherein, the moving direction in corresponding described mobile factor, the calculation procedure of described △ t2 comprises:
According to the straight line that the position location of twice before storing is formed, judge the error of position on described straight line when prelocalization;
The time interval △ t2 of location next time is calculated according to described error size.
2. method according to claim 1, is characterized in that, the translational speed in corresponding described mobile factor, and the calculation procedure of described △ t1 comprises:
According to the previous and current position location of locator, previous time interval compute location device translational speed of locating with this, distance/twice time interval of this translational speed=twice position;
The time interval △ t1 of location next time is calculated according to the speed of described translational speed.
3. method according to claim 2, is characterized in that, step C comprises:
When translational speed is lower than the first preset value, increase described △ t1;
When translational speed is higher than the second preset value, reduce described △ t1;
When translational speed is between first, second preset value, maintain described △ t1.
4. method according to claim 2, is characterized in that, the calculating of described △ t1 adopts following formula:
△t1＝f(v)；
△ t1 is the time interval to location next time; V is translational speed; F is a curvilinear function.
5. method according to claim 1, is characterized in that, when described error is less than a particular value, also comprises:
According to the previous and current position location of locator, previous time interval compute location device translational speed of locating with this, distance/twice time interval of this translational speed=twice position;
Before execution location next time, according to above-mentioned translational speed, current location, described moving direction, and position to be reported to arrive the described current time interval, calculate the position that this reports the locator in position moment.
6. method according to claim 1, is characterized in that, the mobile alignment in corresponding described mobile factor, and the calculation procedure of described △ t3 comprises:
The distance size arriving next route branch in running route is judged according to current position location, map track data;
The time interval △ t3 of location next time is calculated according to described distance size.
7. method according to claim 6, is characterized in that, when the described distance to next route branch is greater than a particular value, also comprises:
The motion track that previous and current position location and map track data obtain according to locator calculates the path length between two position locations, again in conjunction with previous and current time interval compute location device translational speed, this translational speed=described path length/time interval;
Before execution location next time, according to above-mentioned translational speed, current location, described map track data, and position to be reported to arrive the described current time interval, calculate the position that this reports the locator in position moment.
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| KR100800996B1 (en) * | 2005-10-17 | 2008-02-11 | 삼성전자주식회사 | Position information system for mobile device and operating method for the same |
| CN201532466U (en) * | 2009-11-09 | 2010-07-21 | 胡宜萍 | Portable personal gps positioning terminal |
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