CN100499919C - Repeater identification in a position determination system - Google Patents
Repeater identification in a position determination system Download PDFInfo
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- CN100499919C CN100499919C CNB2004800057131A CN200480005713A CN100499919C CN 100499919 C CN100499919 C CN 100499919C CN B2004800057131 A CNB2004800057131 A CN B2004800057131A CN 200480005713 A CN200480005713 A CN 200480005713A CN 100499919 C CN100499919 C CN 100499919C
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Abstract
A method of identifying whether a first signal received at a subscriber station has been relayed by a repeater. The method involves measuring at the subscriber station a time difference of arrival between the first signal and a second signal. A hyperboloid or other potential solution surface is then formed from the measured time difference of arrival. A determination is then made whether or not the first signal was relayed by a repeater based on information derived from the potential solution surface.
Description
Related application
The priority that No. the 60/452nd, 214, the U.S. Provisional Application case of the application's case requirement submission on March 3rd, 2003.
Technical field
The present invention relates to the field of position finding and radio communication, and more specifically, the present invention relates to use the position finding in the wireless communication system of repeater.
Background technology
Repeater is a kind of flexible and economic mode that is used for extending the coverage of wireless communication system or fills the coverage gap in the wireless communication system.Repeater also is used in the overlay area of CDMA (code division multiple access) system of bearing many pilot tones a specific dominant pilot (pilot dominant) is provided.The general repeater that shows can be used for increasing or extending the zone of coverage for changing landform such as mountain valley, tunnel and office building etc.For the sub-fraction of the cost of full base station, repeater is adapted at new and sets up in perfect, the ripe network and use.
Enforcement with some repeaters.In prevailing enforcement, repeater serves as two-way amplifier as shown in Figure 1.On forward (descending) link, repeater 104 receives a transmission from feed unit base station (BTS) 102, with its amplification and send it to subscriber station (SS) 106.BTS 102 can be full station (omni station) or a sector in the sector location more than.On reverse link, SS 106 sends to repeater 104 with a transmission, and repeater 104 is with its amplification and send it to BTS 102.Can see not having in the zone of reliable coverage at other, repeater is relaying one reliable signal between feed unit and subscriber station.
According to Federal Communications Commission (FCC) requirement, making great efforts to make subscriber station to be equipped with the ability of measuring their position by the transmission that receives from various sources, the combination of described source such as global positioning system (GPS) satellite, base station or gps satellite and base station.Subscriber station receives transmission from four or more source of known exact position.These sources are synchronous with single time reference.Subscriber station then obtains a time measured value from each transmission, and its expression is along the journey time of the los path between source and the subscriber station.Subscriber station offers these time measured values position determination entity (PDE) then.As response, PDE from the known light velocity of (a) these time measured values, (b) and (c) position in known source come the position at estimating user station.Perhaps, subscriber station uses this information to measure the position of oneself.
The existence of the repeater in the wireless communication system can make the position finding processing seem uncertain.For example, because the existence of repeater can have following danger: subscriber station can be supposed mistakenly from a base station but be line-of-sight transmission from the base station by the transmission of a repeater relaying.Because the time measured value that obtains from this transmission will be exaggerated the journey time between base station and the subscriber station, so will be wrong based on the location estimation of the subscriber station of this time measured value.
Can further explain this problem with reference to figure 2.As shown in the figure, subscriber station 212 receives transmission from four sources that comprise gps satellite 202, BTS 204, gps satellite 206 and BTS 208.Each transmission from source 202,204 and 206 all is a line-of-sight transmission.Yet, two transmission are arranged from BTS 208 receptions.First transmission by numeral 214 identifications is directly received by BTS 208.By the numeral 216 identification second transmission by repeater 210 relayings.By identical unique two transmission discerning the PN sign indicating number modulation of BTS 208 from BTS 208.Than transmission the last 214, and therefore subscriber station 212 is selected transmission 216 to replace transmission 214 to be used for position finding to handle by the transmission 216 of repeater 210 relayings.
In a single day subscriber station 212 receives transmission, just will be identified as the line-of-sight transmission from BTS 208 by the transmission 216 of repeater 210 relayings mistakenly.Therefore, it also will be identified as the expression of the journey time between BTS 208 and the subscriber station 212 mistakenly from the time measured value that this transmission obtains.Yet this time measurement value is not represented this journey time, but has in fact exaggerated this journey time.Therefore, the location estimation based on this time measured value will be wrong.
Summary of the invention
The present invention describes and a kind ofly is identified in first signal that a subscriber station place receives whether by the method for a repeater relaying.In one embodiment, carry out or in described subscriber station, carry out described method by the subscriber station that operates in the synchronous position determination system.Described method is to begin by the difference of measuring at the subscriber station place between described first signal and the secondary signal time of advent.In one embodiment, first signal originates from the base station, and secondary signal is known directly received from its source and not by the signal of repeater relaying.In one implemented, secondary signal originated from gps satellite.
Then, form the feasible solution surface of the possible position of indication subscriber station according to the measured difference time of advent.In one embodiment, the feasible solution surface is a hyperboloid.In one embodiment, described hyperboloid is a hyperboloid of two sheets, and wherein two focuses lay respectively at the position in the source of starting of the position of the base station of starting of first signal and secondary signal.For any point P on the hyperboloid of two sheets, the range difference between some P and two focuses is a constant, and it is poor to equal time of advent measured between first signal and the secondary signal.
Determine that based on the information that obtains from the feasible solution surface whether first signal is by the repeater relaying.In one embodiment, on the approximate tangent plane, the face of land that forms with the position of the base station of starting of first signal, and described plane is crossing to form an intersection curve with the feasible solution surface.If described intersection curve intersects at or be positioned at the overlay area of the base station of starting of first signal, first signal is identified as directly receives so from its base station of starting.If described intersection curve is non-intersect and be positioned at outside the overlay area of the base station of starting of first signal, so first signal is identified as by the repeater relaying.
One of ordinary skill in the art are after having checked the following drawings and having described in detail, and other system of the present invention, method, feature and advantage will obviously or become apparent.This paper is intended to all these other systems, method, feature and advantage all are included in during this describes, and all is included in the category of the present invention and all is subjected to the protection of accessory claim.
Description of drawings
Assembly in graphic does not have necessity proportionally, focuses on illustrating principle of the present invention, and in these were graphic, similar Ref. No. was represented the counterpart among the whole different figure.
Fig. 1 is that the typical application note with repeater is the calcspar of the two-way amplifier between base station and the subscriber station.
Fig. 2 is that explanation is introduced probabilistic figure by the repeater in the PALS (positioning and location system).
Fig. 3 is the figure of the position determination entity of explanation in the PALS (positioning and location system), and described position determination entity is used to calculate the position of subscriber station, and proofreaies and correct from after measured by the resulting time measured value of the signal of repeater relaying.
Fig. 4 is a flow chart according to an embodiment of the invention, and whether it is used to discern first signal that received by subscriber station by the repeater relaying.
Fig. 5 A is the figure of explanation one hyperboloid of two sheets.
The parameter mathematic(al) representation of Fig. 5 B explanation hyperboloid of two sheets.The non-parameter mathematic(al) representation of Fig. 5 C explanation hyperboloid of two sheets.
Fig. 6 is explanation by making and the figure of approximate tangent plane, the face of land of the position of the base station of starting of signal with the crossing intersection curve that forms of hyperboloid of two sheets of Fig. 5.
Fig. 7 is the figure that intersects between the overlay area of the base station of starting of explanation intersection curve and signal.
Fig. 8 is that explanation is non-intersect and be positioned at the figure of the intersection curve outside the overlay area of the base station of starting of signal.
Fig. 9 is that explanation is from first signal of base station and from the poor sequential chart time of advent between the secondary signal of gps satellite.
Figure 10 is the poor sequential chart time of advent between explanation first signal and the secondary signal, and described signal is from the base station.
Figure 11 be explanation with a plurality of time of advent difference be applied to the sequential chart of integrality monitoring.
Figure 12 is the calcspar of system according to an embodiment of the invention, and whether described system is used to discern first signal that received by subscriber station by a repeater relaying.
Figure 13 is the calcspar of subscriber station that comprises or incorporate into the system of Figure 12.
Embodiment
As used herein, such as " approximately ", " being similar to ", " substantially ", " near " term be intended to allow have some errors aspect the mechanical precision, to explain acceptable admissible error in the industry.Therefore, by term " approximately ", " being similar to ", " substantially ", " near " value revised up or down 1% to 20% or more among a small circle in any deviation should think obviously in the scope of setting.
As used herein, term " software " comprising: source code, assembler language code, binary code, firmware, macro-instruction, microcommand etc., or any combination of two or more foregoings.
Term " memory " relates to any processor readable media, include, but is not limited to random-access memory (ram), read-only memory (ROM), EPROM (Erasable Programmable Read Only Memory) (EPROM), programmable read-only memory (prom), EPROM (Erasable Programmable Read Only Memory) (EEPROM), disk, floppy disk, hard disk, compact disc read-only memory (CD-ROM), Digital video disc (DVD) etc., or any combination of two or more foregoings, can store a series of software instructions that can carry out by processor on it.
Term " processor " or " central processing unit (CPU) " relate to any device that can carry out a series of instructions, and include, but is not limited to: universal or special microprocessor, finite state machine, controller, computer, digital signal processor (DSP) etc.
Term " logic " relates to functional enforcement of any combination of hardware, software or hardware and software.
Phrase " base station " (BTS) comprises individual sector.
Phrase " gps satellite " comprises spacecraft (SV).
Phrase " PALS (positioning and location system) " comprises and is covered on the wireless communication system or is integrated in PALS (positioning and location system) in the wireless communication system.
" synchronously " PALS (positioning and location system) is one to be had and all or all substantially system elements system of the shared system time reference of multisystem element perhaps.
First signal is compared with secondary signal and the phrase " time of advent is poor " that obtains is the absolute value of difference of the time of advent of first signal and secondary signal.
Example environment
The system 300 of Fig. 3 measures the position of the subscriber station 312 in the wireless communication system that can use repeater.This system is an example that wherein can operate the environment of method of the present invention, and should be appreciated that, can be other environment.Therefore, there is not anything to can be used as restriction in the description of this example environment.
In this system, subscriber station 312 receives by the signal for visible plurality of sources 302,304,306 of the receiver in the subscriber station and 308 transmission.In addition, the signal from source 308 can directly be received and also can be received by repeater 310 transmission backs.As described, the source can be the combination of BTS, gps satellite or BTS and gps satellite.In illustrated example, source 302 and 306 is gps satellites, and source 304 and 308 is BTS.In addition, BTS 308 is supply base stations relevant with repeater 310.
Each source transmission is by the signal of the identification code modulation in the described source of unique identification.In one embodiment, identification code is the PN sign indicating number, and it is according to related source and different on the length or on the cycle.For the cdma system that meets IS-95, the PN sign indicating number is that length is the sequence of 32,768 chips, and it just repeats every 26.67 milliseconds.In the current GPS system, the PN sign indicating number is that length is the sequence of 1,023 chip, and its each one millisecond is just repeated.
Directly receive all by the signal of source 302,304 and 306 transmission and the signal 314 that transmits by BTS308 by subscriber station 312.Therefore all signals all are and separately the relevant line-of-sight signal in source.Yet, be not line-of-sight signal from the position of feed unit 308 from base station 308 and by the signal 316 of repeater 310 relayings.
Position determination entity (PDE) 318 can accessing database 320.Database 320 contains the inlet that is useful on each repeater that exists in the wireless communication system.Each inlet comprises the record of one or more calibration parameters (for example, the position of corresponding repeater and the time adjustment that is used for corresponding repeater).Any method that use is used to calibrate repeater obtains this information, in the Qualcomm file number is the U.S. patent application case of submitting to 14 days February in 2003 in 020407 the 10/366th, describe described method in No. 960, incorporated described application case into this paper by reference.Use the PN sign indicating number of feed unit to come each inlet is indexed.Described database also can be incorporated one or more yearbooks into, the current location of each source in its indication mechanism 300 (no matter it is the combination of base station, gps satellite or base station and gps satellite).In the illustrated system 300 of Fig. 3, these one or more yearbooks are indicated the current location of gps satellites 302 and 306 and the current location of base station 304 and 308.
Supposing the system 300 is synchro systems, and being one provides with all system elements or to the system of the shared time reference of the system element that reduces a lot (such as (but being not limited to) gps time).Subscriber station 312 uses this information to adjust and arrives time measured value so that they follow system time.Perhaps, carry out this task by PDE 318.The example of sychronous wireless communication system is IS-95 (CDMA), CDMA2000 and Wideband-CDMA (WCDMA) (synchronous mode) system.
If there is the time measured value that obtains from the signal by the repeater relaying, PDE 318 uses the PN sign indicating number of feed unit to come from the calibration parameter of the described repeater of database 320 retrievals so.Specifically, record of PDE 318 retrieval, described record contain the time adjustment that is useful on repeater and the position of repeater.Then, PDE 318 time adjustment that is used for repeater is proofreaied and correct from the measured value time of advent that pilot signal obtains.PDE 318 also replaces the position of feed unit with the position of repeater.PDE 318 carries out these adjustment at each of the measured value that relates to after measured by the signal of repeater relaying the time of advent.
Then, PDE 318 uses calibrated time measured value and upgrades the position that subscriber station 312 is measured in the position.Still in one embodiment, known triangulation or the trilateration program position that is used to obtain subscriber station 312.In case after measured, the position of subscriber station 312 just can send subscriber station 312 or some other network entity to by PDE 318.
Perhaps, subscriber station 312 uses one or more yearbooks of the position in calibration parameter database 320 and index signal source to measure the position of himself, subscriber station 312 addressable described databases and described one or more yearbook.
Embodiments of the invention
The flow chart of an embodiment of explanation the method according to this invention among Fig. 4.This flow chart is with step 402 beginning, and it is poor that described step is included in the time of advent of measuring between first signal and the secondary signal at the subscriber station place.In one embodiment, suppose first signal from having the known position and the base station of overlay area, and the hypothesis secondary signal is from the source with known position.In addition, in one embodiment, secondary signal be one known that directly receive and not by the signal of repeater relaying from its source.In a configuration, secondary signal is a non-repeating signal.In one embodiment, carry out described method by the subscriber station that operates in the PALS (positioning and location system).In an embodiment, PALS (positioning and location system) is a synchronous position determination system.
In one embodiment, the position in the source of the position of the base station of starting of first signal and secondary signal is a given value.In one embodiment, these values all obtain from yearbook, in described yearbook, remain with in the PALS (positioning and location system) all or to the current location in the source of reducing a lot.In one embodiment, first and second signals all are pilot signals.
Flow chart proceeds to step 404 from step 402, has formed a feasible solution surface, and described feasible solution surface is by the possible position of measured difference indication time of advent subscriber station.
In one embodiment, the feasible solution surface is a hyperboloid, is compared with secondary signal and the difference and the known location of first signal and secondary signal and the obtain described hyperboloid time of advent that obtains by first signal.In the illustrated enforcement of Fig. 5 A, hyperboloid is a hyperboloid of two sheets 500, and it has first leaf and second leaf 512,514, and focus 502,504 lays respectively at the known location in source of the start base station and the secondary signal of first signal.
This hyperboloid of two sheets is characterised in that, any point P on the hyperboloid is constant (or constant substantially) and to equal (or equaling substantially) measured first signal and time of advent between the secondary signal in step 402 poor to the difference of the distance (respectively by Ref. No. 508 and 509 identifications) of first focus and second focus.Rotating shaft is by Ref. No. 510 identifications, and summit the 503, the 505th, the intersection point of the rotating shaft 510 and first leaf and second leaf 512,514.The parameter expression of Fig. 5 B explanation hyperboloid of two sheets, and the nonparametric expression formula of Fig. 5 C explanation hyperboloid of two sheets.
Then, based on information measurement first signal that obtains from the feasible solution surface whether by the repeater relaying.In one embodiment, this mensuration comprises among Fig. 4 step 406,408,410,412 and 414 illustrated in the frame of broken lines.In this embodiment, step 406 follows step 404.Step 406 comprises approximate tangent plane, the face of land with the position of the base station of starting of first signal of formation.In one embodiment, use known technology self to form this plane according to any normal vector and the described point on the face of land, position that extends through the base station of starting from the earth's core.Execution in step 408 then.Step 408 comprises to make and intersects from plane that step 406 obtains and the feasible solution surface that obtains from step 404 and form a cross curve.
Fig. 6 has illustrated the example of this step under following situation: from the feasible solution surface that step 404 obtains is the hyperboloid of two sheets 500 of Fig. 5.Plane 602 is the 600 approximate tangent planes, the face of land with 502 places, position of the base station of starting of first signal.Curve 604 is by making plane 602 and hyperboloid of two sheets 500 intersect the intersection curve that forms.
Rotate back into Fig. 4, inquiry step 410 follows step 408.Whether step 410 comprises intersection curve that mensuration obtains from step 408 and intersects with the overlay area of the base station of starting of first signal or be positioned at described overlay area.If like this, execution in step 412 so.In step 412, first signal receives from its base station of starting through being identified as directly.
If in step 410, the surface of intersection that obtains from step 408 does not intersect with the overlay area of the base station of starting of first signal or is not positioned at described overlay area, and execution in step 414 so.In step 414, first signal is through being identified as by the repeater relaying.
In one embodiment, the start overlay area of base station is the parameter that obtain from the information that yearbook provided that can be utilized by PDE.
Although step illustrated in fig. 4 is to carry out with certain order, should be appreciated that to have this order the embodiment that changes has taken place.For example, step 406 can be carried out simultaneously with the one or both in step 402 and 404.
Fig. 7 illustrates that one intersects or be positioned at the intersection curve 604 of described overlay area with the overlay area 702 of the base station of starting of first signal.Therefore, first signal directly receives from the base station of starting at the subscriber station place through being identified as.
Fig. 8 illustrates the outer and intersection curve 604 that do not intersect with described overlay area in the overlay area 702 of a base station of starting that is positioned at first signal.Therefore, first signal is through being identified as by the repeater relaying.
An example of Fig. 9 description time line, it has following situation: the source of secondary signal is a gps satellite.The time of advent of Ref. No. 908 identifications first signal, and the time of advent of Ref. No. 910 identification secondary signals.Difference ρ between these two values
SKIt is the difference time of advent that is used to form the feasible solution surface of step 404.On the feasible solution surface is under the situation of hyperboloid of two sheets 500, and the known location of gps satellite forms second focus 504 of hyperboloid of two sheets 500.
By using the peak value of known technology location, measure arrival time value 908 by the correlation function that composite signal (it comprises the compound of the pilot signal that receives from visible those base stations of subscriber station) is associated with the PN sign indicating number of the base station of starting of identification first signal obtain.By using the known technology location, measure arrival time value 910 by the be associated peak value of the correlation function that obtains of the PN sign indicating number that makes composite signal (it comprises the compound of the pilot signal that receives from visible those gps satellites of subscriber station) and identification send the gps satellite of secondary signal.
Be worth 908,910 the time of advent and all follow the gps system time 902.Yet, all follow the gps system time 902 because be worth 908,910 the time of advent, here so the gps system time 902 is not directly related; Therefore, this value does not participate in ρ
SKCalculating.
Be Δ the time of advent 908 of first signal
i(skew of the system time at the base station place of starting of the gps system time and first signal) and d (base station transmits postpones with one way propagation between receiving at subscriber station from starting) with, be worth Δ
iThe calibration parameter of normally known previous mensuration, and value d starts that sighting distance between base station and the subscriber station postpones or by propagate the delay that produces by repeater.Because these values are not used for calculating ρ
SKSo these values are not directly related here.
Figure 10 is an example of timeline, and it has following situation: the source of secondary signal is another base station.Ref. No. 908 is still discerned the time of advent of first signal at the subscriber station place, and Ref. No. 1002 identifications are from the secondary signal of second base station time of advent at the subscriber station place.Difference between these two values
It is the potential difference time of advent of separating the surface that is used to form step 404.On the feasible solution surface is under the situation of hyperboloid of two sheets 500, and the known location of second base station forms second focus 504 of hyperboloid of two sheets 500.
Be worth 908 and 1002 the time of advent and all still follow gps time 902, gps time does not still participate in
Calculating.Equally, value Δ
iWith d because be not used in calculating
So it is uncorrelated equally.
Can calculate also that gps satellite signal is compared with first signal and the difference ρ time of advent that obtains
SKWith the complete monitoring.In integrality monitoring, method of the present invention is used for independently first signal being classified as and directly receives from its base station of starting or by the repeater relaying.A kind of being to use of being sorted out
And carry out; Another kind is to use ρ
SKAnd carry out.If result's coupling so just thinks that they are reliable and acceptable.Yet, if the result does not match, so just think that they are insecure, and can adopt other measured value to come reliably first signal to be sorted out from other signal source.
Figure 11 is an example of timeline, and it has following situation: received by subscriber station and be used for the integrality monitoring from the received signal of more than one gps satellite.In this particular instance, use two gps satellite signals, and discern the time of advent of each satellite-signal by Ref. No. 1102 and 1104 respectively.Also measure the difference ρ time of advent of each satellite-signal
SKAnd ρ
SjValue ρ
SkBe a satellite-signal in the satellite-signal compare with first signal and time of advent of obtaining poor, and value ρ
SjBe another satellite-signal in two satellite-signals compare with first signal and time of advent of obtaining poor.
Use method of the present invention, the time of advent one of difference (ρ
SKOr ρ
Sj) be used for first signal is sorted out.Another, difference was used for independently first signal being sorted out time of advent.If result's coupling so just thinks that the result is reliably with acceptable; If they are inconsistent, can adopt other measured value to come reliably first signal to be sorted out so.
Although the integrality monitoring of two gps satellite signals is used in the explanation of the example of Figure 11, but should be appreciated that, also can be to use the combination of two or more base station signals, base station and gps satellite signal and other example that two or more gps satellite signals come the complete monitoring.
Figure 12 explanation is according to the embodiment of system 1200 of the present invention.As described, in this embodiment, system 1200 comprises a memory 1202, the specific software instruction of its variant that its preservation makes method or any embodiment, enforcement, the example of Fig. 4 or described or advised.System 1200 also comprises a processor 1204, and it is configured to access and carries out the software instruction of being preserved by memory 1202.In carrying out the process of method of the present invention, the time of advent that processor 1204 accesses are provided by correlator (not shown) and/or the time of advent difference, described correlator then obtains these values from the signal that is offered it by receiver (not shown).Can directly or by memory 1202 described value be offered processor 1204.Should be appreciated that the embodiment of the system 1200 that implements also is fine in any combination of hardware, software or hardware and software.
Figure 13 is the calcspar of the example of the subscriber station in the wireless communication system of the system that comprises or incorporate into Figure 12.Other example equally can, so there is not anything to can be used as restriction among Figure 13.
The composite signal that gps receiver 1312 is configured to receive and rectification is formed by the pilot signal from the visible gps satellite of subscriber station, and will offer correlator 1318 through the information of rectification.Composite signal receives by antenna 1314.
Similarly, the composite signal that radio transceiver 1306 is configured to receive and rectification is formed by the pilot signal of the visible base station transmits of subscriber station, and will offer correlator 1318 through the information of rectification.Composite signal receives by antenna 1310.
In this particular instance, gps receiver 1312 and radio transceiver 1306 shared identical filter chain, but should be appreciated that the example that each in gps receiver 1312 and the radio transceiver 1306 all disposes independent filter chain also is fine.
Can use this information to obtain radio communication service and/or measure its position or measure its position by subscriber station by other entity in PDE or the PALS (positioning and location system).
The channel symbol that channel decoder 1320 is configured to be offered it by fundamental frequency processor 1308 is decoded into basic source bits.In channel symbol was a example with the symbol of convolutional encoding, channel decoder was Viterbi (Viterbi) decoder.At channel symbol is that channel decoder 1320 is special ripple (turbo) decoders in second example of convolution code string serial or that walk abreast.
The specific software instruction of its variant that memory 1304 is configured to preserve method or any embodiment, enforcement, the example that makes Fig. 4 or had described or advised.
Whether CPU 1302 is configured to access and carries out these software instructions, and and then discern from signal of base station by the repeater relaying.
Though described various embodiment of the present invention, be understood by those skilled in the art that many other embodiment in the category of the present invention and enforcement also are fine.
Claims (13)
1. whether one kind be identified in one first signal that a subscriber station place receives by the method for a repeater relaying, and it comprises:
Poor in the time of advent that described subscriber station place is measured between described first signal and the secondary signal, described secondary signal is non-repeating signal;
Form the feasible solution surface of the possible position of the described subscriber station of an indication according to the described measured difference time of advent; With
Based on described first signal of the information Recognition that obtains from described feasible solution surface whether by a repeater relaying,
Wherein said first signal originates from a base station with a position and an overlay area, and described secondary signal originates from a source with a position, and described identification step comprises:
Formation one and approximate tangent plane, the face of land of the described position of the described base station of starting of described first signal;
Described plane and described feasible solution surface is intersected to form an intersection curve;
If the described overlay area of the described base station of starting is intersected or be positioned in the described overlay area of described intersection curve and the described base station of starting, first signal is identified as directly receives so from the described base station of starting; With
If described curve does not intersect with the described overlay area of the described base station of starting of described first signal and is positioned at outside the described overlay area of the described base station of starting of described first signal, so described first signal is identified as by a repeater relaying.
2. method according to claim 1, the described source of wherein said secondary signal are a global positioning system (GPS) satellites.
3. method according to claim 1, the described source of wherein said secondary signal is a base station.
4. method according to claim 1, wherein said feasible solution surface is a hyperboloid.
5. method according to claim 4, wherein said hyperboloid is the hyperboloid of two sheets with two focuses, described first focus is the described position of the described base station of starting of described first signal, and the described position in described second focus source that is described secondary signal.
6. method according to claim 1, the described position of the wherein said base station of starting obtains from a yearbook.
7. method according to claim 2, the described position of the described gps satellite of the described secondary signal that wherein starts obtains from a yearbook.
8. method according to claim 3, the described position of the described base station of the described secondary signal that wherein starts obtains from a yearbook.
9. method according to claim 1, wherein said first signal is a pilot signal.
10. method according to claim 1, wherein said secondary signal are pilot signals.
11. whether one kind be identified in one first signal that a subscriber station place receives by the method for a repeater relaying in a synchronous position determination system, it comprises:
Poor in the time of advent that described subscriber station place is measured between described first signal and the secondary signal, described first signal originates from a base station with a position, and described secondary signal is non-repeating signal and originates from a gps satellite with a position;
According to the described measured time of advent poor, described first signal the described position of the described base station of starting and the described position of the described gps satellite that starts of described secondary signal form a hyperboloid; With
Based on described first signal of the information Recognition that obtains from described hyperboloid whether by a repeater relaying,
Wherein said base station has an overlay area, and described identification step comprises:
Formation one and approximate tangent plane, the face of land of the described position of the described base station of starting of described first signal;
Described plane and described hyperboloid are intersected to form an intersection curve;
If the described overlay area of the described base station of starting is intersected or be positioned in the described overlay area of described intersection curve and the described base station of starting, first signal is identified as directly receives so from the described base station of starting; With
If described curve does not intersect with the described overlay area of the described base station of starting of described first signal and is positioned at outside the described overlay area of the described base station of starting of described first signal, so described first signal is identified as by a repeater relaying.
12. method according to claim 11, wherein said hyperboloid is a hyperboloid of two sheets, and its first focus and second focus lay respectively at the described position in the described source of the described position of the described base station of starting of described first signal and described secondary signal.
13. whether one kind be used to be identified in one first signal that a subscriber station place receives by the system of a repeater relaying, it comprises:
Be used for measuring the member that differ from the time of advent between described first signal and the secondary signal at described subscriber station place, described secondary signal is non-repeating signal; With
Be used for (1) forms a feasible solution surface according to the described measured difference time of advent logic; (2) based on described first signal of the information Recognition that obtains from described feasible solution surface whether by the logic of a repeater relaying,
Wherein said first signal originates from a base station with a position and an overlay area, and described secondary signal originates from a source with a position, and described institute logic further is configured to:
(1) formation one and approximate tangent plane, the face of land of the described position of the described base station of starting of described first signal; (2) described plane and described feasible solution surface is intersected to form an intersection curve; (3), first signal is identified as so and directly receives from the described base station of starting if the described overlay area of the described base station of starting is intersected or be positioned in the described overlay area of described intersection curve and the described base station of starting; And (4), so described first signal is identified as by a repeater relaying if described curve does not intersect with the described overlay area of the described base station of starting of described first signal and is positioned at outside the described overlay area of the described base station of starting of described first signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US45221403P | 2003-03-03 | 2003-03-03 | |
| US60/452,214 | 2003-03-03 | ||
| US10/434,671 | 2003-05-09 |
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| CN1757255A CN1757255A (en) | 2006-04-05 |
| CN100499919C true CN100499919C (en) | 2009-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004800057131A Expired - Fee Related CN100499919C (en) | 2003-03-03 | 2004-03-02 | Repeater identification in a position determination system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9279879B2 (en) * | 2009-06-26 | 2016-03-08 | Qualcomm Incorporated | Positioning in the presence of passive distributed elements |
| JP2016142595A (en) * | 2015-01-30 | 2016-08-08 | 富士通株式会社 | Mobile entity terminal, position specification method, position specification program, and position specification device |
| US9482742B1 (en) | 2015-05-12 | 2016-11-01 | Qualcomm Incorporated | Positioning reference signal (PRS) generation for multiple transmit antenna systems |
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| CN1757255A (en) | 2006-04-05 |
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