CN100399042C - Method and apparatus for reducing code phase search space - Google Patents
Method and apparatus for reducing code phase search space Download PDFInfo
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- CN100399042C CN100399042C CNB018144233A CN01814423A CN100399042C CN 100399042 C CN100399042 C CN 100399042C CN B018144233 A CNB018144233 A CN B018144233A CN 01814423 A CN01814423 A CN 01814423A CN 100399042 C CN100399042 C CN 100399042C
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- signal
- received
- encoding phase
- positioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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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
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
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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
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/05—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data
-
- 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
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
Abstract
A GPS communication system including a server and a client, each including a GPS receiver, for reducing the code phase search space of the GPS receiver of the client. The communication system includes a transmitter for transmitting timing information from the server to the client to help the client locate a first satellite, and a receiver for using timing differences between the satellites to synchronize and locate other satellites. The code phase search space is reduced by reducing the number of phase hypotheses that must be calculated to establish communication between the server and the client.
Description
Background of invention
(1) invention field
The present invention relates to the minimizing of the encoding phase search volume of receiver in the distributed system.
(2) description of Related Art
Global position system comprises the orbiter (being also referred to as spacecraft or " SVs ") of one group of broadcast singal, and receiver can be determined its position according to these signals.Two such systems are NAVSTAR gps system of quoting here (as describing in " GPS; SPS signal standard; second edition; publish June 2 nineteen ninety-five; U.S. seashore defence navigation center; Alexandria, VA ") and the global orbital navigation system (GLONASS) that is kept by Russian republic.In order to determine its three-dimensional position in such positioning system, receiver must at first be caught the signal of four SV.The initial acquisition of each SV signal normally calculating strength is big and may need nearly a few minutes.
In order to catch a gps signal, receiver must be from the phase place of the frequency of motion tracking carrier signal and the coding of modulating on carrier wave.Because SV is with respect to the Doppler shift of the motion and the generation of receiver, the frequency of the carrier wave that receives may change.Inaccuracy in the local oscillator of receiver can cause extra frequency error.Therefore, need receiver search signal in the certain frequency scope from the motion tracking carrier wave.
Each SV sends a signal of being expanded by the direct sequence spread spectrum modulation.Especially, each SV sends digital pseudorandom (or " pseudo noise ") yard signal of expanding of being caught (CA) by known being called slightly.The spreading rate of this periodic code is 1.023MHz and repeats once (that is, every megasecond once) every 1023 code elements.The signal that receiver receives can be the composite signal that some SV send.
Determine to have received the encoding phase of SV signal by the location of pre-position in the CA sign indicating number of signal.Because this CA sign indicating number is periodic, as shown in Figure 1, may the locating of precalculated position (that is, possible encoding phase) can show as the point along circumference.Each position (for example is correlated with on definite needs search circumference of the encoding phase of received signal, between receiver output and coded sequence based on specific CA coding) in coding is positioned at the signal that has received (indicated when for example, occurring) as correlation peak.
Because the nominal carrier frequency of gps signal is 1.575GHz, so holding signal is difficult synchronously under such as the covering of indoor, Che Nei and/or tree.When portable GPS receiver loss signal is synchronous, when attempting to catch this signal again, receiver will suffer the termination of inconvenience of station-keeping ability and the consumption of computational resource.Because it is quite slow that frequency shift (FS) changes, rebuild Frequency Synchronization and only need limited effort so have no progeny between of short duration at one.Yet the encoding phase of received signal changes faster, and is necessary the signal that search is lost on whole 1023 code element encoding phase circumference.For once requiring the accurate locating information must operational application, such delay may not be accepted.Certainly, it equally also is favourable avoiding long delay during initial acquisition.
Expand certain wireless system by the ability that increases the position of locating specific mobile unit and conform with demand to be used for mobile communication.The rule (report for the third time and rule that distribution on October 6th, 1999, on September 15th, 1999 are adopted, recording mechanism 94-102) that reason is the federal communications commission promulgation.This rule needs all honeycomb substrates of the U.S. can be positioned at position in 50 meters (and to 95% calling in 150 meters) to the cell phone of making 911 67% the callings of calling out before October calendar year 2001.Other application of station-keeping ability comprises the value-added user characteristics as navigation and fleet management's support in the wireless communication system.
A kind of selection that location fixes is added such communication system is that the GPS receiving ability is added mobile unit.Yet such method can suffer to keep in many zones that mobile unit usually is suitable for the difficulty of gps signal reliable reception, for example, and in the indoor and car.On the other hand, the base station in such system is generally arranged well according to satellite visibility, and movement station can be assisted by gathering the information (comprising encoding phase) on the SV signal and it being forwarded to movement station in the base station.
In the CDMA systems of radio communication, the operation of movement station and base station comes synchronous (see figure 1) with public time reference.Because this characteristic, base station can send the significant encoding phase information with respect to this time reference of movement station.Because the position difference of base station and movement station, and because the inaccuracy in the local oscillator of mobile unit, the encoding phase of the gps signal that the encoding phase information that is sent by the base station may receive with mobile unit conforms to with being inaccurate.Yet this process can reduce the size (for example, from 1023 code elements to 30 code elements only) of encoding phase search benchmark widely.
Yet, in the simulation system of the radio communication as advanced mobile phone service (AMPS) system that is widely used in the U.S., do not have such time reference between movement station and base station.In fact, the operation at two kinds of stations even can not be by synchronously within one millisecond (that is, traveling through the time of whole encoding phase circumference).Therefore, there is not the system reference point (see figure 2) that can send useful encoding phase information about the base station.Therefore, in an AMPS system by movement station support GPS station-keeping ability, satellite is synchronous catch arbitrarily and catch again all needs to search for whole encoding phase circumference.In such distributed system, reduce the encoding phase search volume and conform with demand.
General introduction
In the CDMA receiver as the GPS receiver, reduce system, the method and apparatus of encoding phase search volume.Obtain this minimizing by the information that applies about the time relationship between two received signals.If the encoding phase of first signal is known, this time relationship provides the ability of the encoding phase that can learn second signal.Because searcher can directly turn to the encoding phase of expectation, can reduce the search volume so know the encoding phase of second signal.
Brief description of drawings
Accompanying drawing is incorporated into this and is an ingredient of this explanation, it one embodiment of the present of invention have been described and in conjunction with interpretation advantage of the present invention and principle.Among the figure:
Fig. 1 illustrates the cdma system with system reference time;
Fig. 2 illustrates does not have the AMPS of system reference time system;
How Fig. 3 illustrates the encoding phase of determining signal from the encoding phase of (1) another signal and the time difference between (2) encoding phase;
Fig. 4 illustrates a kind of method of expression more than the time difference between the encoding phase of two signals;
Fig. 5 illustrates the another kind of method of expression more than the time difference between the encoding phase of two signals;
Fig. 6 illustrates the system according to the embodiment of the present invention and a plurality of SV 100;
Fig. 7 illustrates the block diagram of device 120 according to an embodiment of the invention;
Fig. 8 illustrates the process flow diagram of method according to an embodiment of the invention;
Fig. 9 illustrates the process flow diagram of method according to another embodiment of the invention;
Figure 10 illustrates the process flow diagram of method according to a further embodiment of the invention;
Figure 11 illustrates the block diagram of the exemplary realization of device 120 according to an embodiment of the invention;
Figure 12 illustrates the block diagram of device 110 according to an embodiment of the invention;
Figure 13 illustrates the block diagram of the exemplary realization of device 110 according to an embodiment of the invention; And
Figure 14 illustrates the block diagram of another exemplary realization of device 110 according to an embodiment of the invention.
The detailed description of accompanying drawing
Following detailed is with reference to the accompanying drawing of the explanation embodiment of the invention.Other embodiment also is possible and can makes modification and not exceed the spirit and scope of the present invention embodiment.Therefore, following detailed and do not mean that restriction the present invention.On the contrary, scope of the present invention is to be stipulated by appended claim.
In according to the system of one embodiment of the present of invention, method and apparatus, the location of the encoding phase of second received signal is by using the clauses and subclauses of following temporal information: the time relationship between the encoding phase of the encoding phase of (1) first received signal and (2) two received signals (for example, the time difference as shown in Figure 3).This method can expand to permission by provide time difference increment (that is, and about another signal that receives, as shown in Figure 4) and/or accumulated time difference (that is,, as shown in Figure 5) locate the signal that receives in addition about first signal that receives.
Fig. 6 illustrates the block diagram according to the system of one embodiment of the present of invention, and it comprises a field receiver 110 and a reference receiver 120.Reference receiver 120 received signal and determine the encoding phase (for example, by carrying out relevant) of these received signals from first and second SV 100 at least with the local replica of known CA sign indicating number.The information that is attached to the time relationship between the encoding phase of received signal then is sent to field receiver 110.After the encoding phase of determining from first SV 100,110 usefulness time of field receiver relevant information reduces the size at its interval of required search when the encoding phase of definite signal from second SV 100.
Fig. 7 illustrates the block diagram according to the reference receiver 120 of one embodiment of the present of invention.In reference receiver 120, radio frequency (RF) receiver 210 receives the modulated carrier signal and the signal after the corresponding demodulation is outputed to correlator 220 from least two SV.Correlator 220 is determined the encoding phase of received signal and the information about the difference in these encoding phases is outputed to transmitter 230 (for example, shown in the task P110 and P120 of Fig. 8).
Shown in the task 140 of Fig. 8, the information that transmitter 230 sends by correlator 220 outputs.In an example, the difference that correlator 220 is determined between encoding phase, and transmitter 230 sends this difference (for example, shown in the task P130 and P145 of Fig. 9).In another example of Figure 10, the information (task P142) that transmitter 230 sends about the encoding phase of received signal, and the receiver of this information (for example, field receiver 110) operation task is to determine the time difference between this encoding phase.
Figure 11 shows the exemplary embodiment of reference receiver 120.In this example, RF receiver 210 by gps antenna from SV 100 received signals.Encoding phase information discussed above then sends (for example, to one or more field receivers 110) by transmitter 230 by communication antenna 250.
As shown in figure 12, the field receiver 110 according to one embodiment of the present of invention comprises a receiver 310 from least two SV received signals.Radio-frequency transmitter 310 also receives a reference signal, therefrom derives the time relationship (for example, difference) between the encoding phase of SV signal when being received by reference receiver.
For the signal that is received from first SV, correlator 320 is determined its encoding phase.Correlator 320 combines the time relationship between this encoding phase information and first SV signal and second SV signal, with the search volume of the encoding phase that reduces by second SV signal.
In the exemplary embodiment of field receiver 110 as shown in figure 13, the RF receiver receives reference signal (for example, from reference receiver 120) by gps antenna 340 from the SV received signal and by communication antenna 350.RF receiver 310 can be an integrated unit, or RF receiver 310 can comprise the unit (GPS receiver 310-1 and communication control processor 310-2) of two separation as shown in figure 14.
In client-server architecture of the present invention shown in Figure 2, central server has the GPS receiver of himself, and it learns the frequency of the skyborne position of satellite, those satellites and the time difference between satellite and the server exactly from out of Memory.Server can send to information the client computer machine of the satellite of discerning in the visual field, thus make the client computer machine not need to search for each satellite and only need search for may received signal satellite.For example, server can be transmitted about corresponding to the information of the coded sequence of the SV in the visual field (for example, sequence itself or corresponding to one or more index of predictive encoding sequence table).Server also can send to client computer to the Doppler frequency information of satellite.In addition, server can send to client computer to the timing of satellite (for example, one or more time differences between encoding phase).Server sends these information of three types with the order that provides above and conforms with demand.
So, significantly reduced the required search volume or time of GPS receiver of client computer machine among the present invention.In wireless GPS client computer machine-server architecture according to one embodiment of the present of invention, even if do not exist under the situation that does not have available common time of benchmark between available timing base or client computer machine and the server at the client computer place, the transmission of being undertaken by server about the relative timing of satellite also can reduce the search volume.
The front makes any technician of this area can make or use the present invention to the statement of describing embodiment.Various modifications to these embodiment are possible, and the General Principle of statement here also can be applied to other embodiment.For example, the present invention can be partly or entirely as a hard-wired circuit, constitute circuit arrangement of special IC or one be loaded into the firmware program in the non-volatile storer or load Zi or to realizing as a software program of the such data storage medium of machine readable code (this yard can be by the executable instruction of logical cell array as microprocessor or other digital signal processing unit).Therefore, the present invention embodiment of being not limited to illustrate above but any principle and the novel characteristics the most wide in range consistent scope that meet and disclose here.
Claims (21)
1. method that is used to reduce the encoding phase search volume of the positioning signal that is received by movement station is characterized in that comprising:
At receiver place away from movement station, in a plurality of signals that received, determine the encoding phase of each signal, the wherein said signal that has received is a positioning signal; And
Determine the time difference between a plurality of encoding phases that received first and second positioning signals in the positioning signal, and described time difference is sent to movement station;
Receive described first positioning signal at the movement station place, and determine first encoding phase;
Receive described second positioning signal at the movement station place and determine second encoding phase of described second positioning signal in response to the time difference of described first encoding phase and described transmission.
2. the method for claim 1 is characterized in that, each signal in a plurality of received signals all has corresponding periodicity coding, and
Wherein each in the encoding phase is all relevant with the precalculated position in the respective cycle coding.
3. the method for claim 1 is characterized in that, each signal in a plurality of received signals is all to the signal of small part based on corresponding direct sequence spread spectrum modulation.
4. the method for claim 1 is characterized in that, each signal in many received signals is all to the signal of small part based on corresponding direct sequence pseudo noise modulation.
5. the method for claim 1 is characterized in that, this method further comprises composite signal of reception,
Wherein each signal in a plurality of received signals is all to small part at least a portion based on this composite signal.
6. method as claimed in claim 5, it is characterized in that, the determining of the encoding phase of each signal in a plurality of received signals comprises for each of a plurality of signals that received and calculates corresponding coding sequence and to small part relevant based between the signal of composite signal
Wherein each signal in a plurality of received signals all has a corresponding periodically coding, and
Wherein each encoding phase is relevant with the corresponding precalculated position in the corresponding periodically coding, and
Wherein coded sequence to small part is encoded relevant with corresponding periodicity.
7. method that is used to reduce the encoding phase search volume of the positioning signal that is received by movement station is characterized in that comprising:
Receive the time difference between first positioning signal and second positioning signal at the movement station place, described time difference is sent by reference receiver;
At the movement station place, determine the encoding phase of described first positioning signal;
At the movement station place, determine the encoding phase of described second positioning signal; The time difference that the determining to be in response to of the encoding phase of wherein said second positioning signal received and the encoding phase of described first positioning signal.
8. method as claimed in claim 7 is characterized in that, first received signal has corresponding periodicity coding and second received signal also has corresponding periodicity coding, and
Wherein each in the encoding phase of first received signal and second received signal is all relevant with the corresponding precalculated position in the corresponding periodicity coding.
9. method as claimed in claim 7 is characterized in that, each of first received signal and second received signal is all to the signal of small part based on a corresponding direct sequence spread spectrum modulation.
10. method as claimed in claim 7 is characterized in that, each of first received signal and second received signal is all to the signal of small part based on a corresponding direct sequence pseudo noise modulation.
11. method as claimed in claim 7 is characterized in that, this method further comprises synthetic signal of reception, and wherein each of first received signal and second received signal is all to small part at least a portion based on composite signal.
12. method as claimed in claim 11 is characterized in that, the determining of the encoding phase of first received signal comprises the calculation code sequence and to small part relevant based between the signal of composite signal,
Wherein first received signal has corresponding periodicity coding and second received signal also has corresponding periodicity coding, and
Wherein each in the encoding phase of first received signal and second received signal is all relevant with the corresponding precalculated position in the corresponding periodicity coding, and
Wherein coded sequence is relevant with the periodicity coding corresponding to first received signal to small part.
13. the device in reference receiver, the encoding phase search volume that is used to reduce field receiver is characterized in that comprising:
The reference position location receiver is configured to receive a plurality of positioning signals;
Correlator is configured to determine a plurality of each encoding phases that received positioning signal; And
Transmitter is configured to the time difference between the encoding phase of at least one pair of signal in a plurality of received signals is sent to described field receiver.
14. device as claimed in claim 13 is characterized in that, each in a plurality of received signals all has corresponding periodicity coding, and
Wherein each in the encoding phase is all relevant with the precalculated position in the corresponding periodicity coding.
15. device as claimed in claim 13 is characterized in that, each in a plurality of received signals is all to the signal of small part based on a corresponding direct sequence spread spectrum modulation.
16. device as claimed in claim 13 is characterized in that, each in a plurality of received signals is all to the signal of small part based on a corresponding direct sequence pseudo noise modulation.
17. device as claimed in claim 13, it is characterized in that, correlator is further configured to determining in a plurality of received signals the encoding phase of each, described determine to small part by relevant between each the calculated signals corresponding coding sequence in a plurality of received signals and these a plurality of received signals carried out
In wherein a plurality of received signals each all has corresponding periodicity coding;
In wherein a plurality of encoding phases each is all relevant with the corresponding precalculated position in the corresponding periodicity coding, and
Wherein corresponding coding sequence to small part is encoded relevant with corresponding periodicity.
18. the movement station with encoding phase search volume of minimizing is characterized in that comprising:
The location positioning receiver is configured to receive the signal of the time difference between the encoding phase that first and second positioning signals and reception comprise first received signal and second received signal, and
Correlator, be configured to determine about at least one encoding phase in first and second received signals of predictive encoding, and make in first and second received signals another relevant in response to the time difference between first and second received signals with predictive encoding.
19. a system is characterized in that comprising:
Reference receiver is configured to receive the concurrent carry information of periodicity positioning signal from a plurality of spacecrafts; And
Field receiver is configured to receive from the described periodicity positioning signal of a plurality of spacecrafts and from described reference receiver and receives described information,
Described reference receiver is that each determines the baseline encoded phase place among in the described periodicity positioning signal at least the first and second, and
Described information is at least about the time difference of the baseline encoded phasetophase of described first and second signals, and
Field receiver is determined the field encoding phase of first positioning signal, and
Field receiver is determined the field encoding phase of second positioning signal in response to the field encoding phase of first positioning signal in described time difference and the described positioning signal.
20. system as claimed in claim 19 is characterized in that, described periodicity positioning signal comprises in GPS and the GLONASS signal.
21. the described system of claim 19 is characterized in that, described field receiver and described reference receiver are the time to go up asynchronous.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US21918100P | 2000-07-19 | 2000-07-19 | |
| US60/219,181 | 2000-07-19 | ||
| US09/741,631 US7369599B2 (en) | 2000-12-18 | 2000-12-18 | Method and apparatus for reducing code phase search space |
| US09/741,631 | 2000-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1454323A CN1454323A (en) | 2003-11-05 |
| CN100399042C true CN100399042C (en) | 2008-07-02 |
Family
ID=26913647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB018144233A Expired - Lifetime CN100399042C (en) | 2000-07-19 | 2001-07-17 | Method and apparatus for reducing code phase search space |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1301802A2 (en) |
| JP (4) | JP2004517298A (en) |
| KR (1) | KR101049836B1 (en) |
| CN (1) | CN100399042C (en) |
| AU (1) | AU7700401A (en) |
| HK (1) | HK1057781A1 (en) |
| IL (1) | IL154020A0 (en) |
| WO (1) | WO2002006847A2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6873910B2 (en) * | 2002-10-22 | 2005-03-29 | Qualcomm Incorporated | Procedure for searching for position determination signals using a plurality of search modes |
| US7688261B2 (en) * | 2006-03-15 | 2010-03-30 | The Boeing Company | Global position system (GPS) user receiver and geometric surface processing for all-in-view coherent GPS signal PRN codes acquisition and navigation solution |
| US8026847B2 (en) * | 2006-09-14 | 2011-09-27 | Qualcomm Incorporated | System and/or method for acquisition of GNSS signals |
| EP3455110A4 (en) | 2016-12-05 | 2019-05-29 | Shenzhen Goodix Technology Co., Ltd. | Sensing vehicle positions with optical sensors |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5752218A (en) * | 1995-05-31 | 1998-05-12 | General Electric Company | Reduced-power GPS-based system for tracking multiple objects from a central location |
| EP0902554A2 (en) * | 1997-09-11 | 1999-03-17 | Lucent Technologies Inc. | An auxiliary system for assisting a wireless terminal in determining its position from signals transmitted from a navigation satellite |
| WO1999044073A1 (en) * | 1998-02-27 | 1999-09-02 | Ericsson Inc. | Stand alone global positioning system (gps) and method with high sensitivity |
| WO2000010028A1 (en) * | 1998-08-13 | 2000-02-24 | Ericsson Inc. | Method and system for aiding gps receivers via a cellular or pcs network |
| US6070078A (en) * | 1997-10-15 | 2000-05-30 | Ericsson Inc. | Reduced global positioning system receiver code shift search space for a cellular telephone system |
-
2001
- 2001-07-17 WO PCT/US2001/022755 patent/WO2002006847A2/en active IP Right Grant
- 2001-07-17 KR KR1020037000801A patent/KR101049836B1/en active IP Right Grant
- 2001-07-17 IL IL15402001A patent/IL154020A0/en not_active IP Right Cessation
- 2001-07-17 CN CNB018144233A patent/CN100399042C/en not_active Expired - Lifetime
- 2001-07-17 AU AU7700401A patent/AU7700401A/en not_active Withdrawn
- 2001-07-17 JP JP2002512703A patent/JP2004517298A/en not_active Withdrawn
- 2001-07-17 EP EP01954780A patent/EP1301802A2/en not_active Ceased
-
2004
- 2004-01-29 HK HK04100599A patent/HK1057781A1/en not_active IP Right Cessation
-
2013
- 2013-01-04 JP JP2013000185A patent/JP2013117536A/en active Pending
-
2014
- 2014-12-18 JP JP2014256482A patent/JP2015121537A/en not_active Ceased
-
2016
- 2016-11-11 JP JP2016220498A patent/JP2017096940A/en active Pending
Patent Citations (5)
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| US5752218A (en) * | 1995-05-31 | 1998-05-12 | General Electric Company | Reduced-power GPS-based system for tracking multiple objects from a central location |
| EP0902554A2 (en) * | 1997-09-11 | 1999-03-17 | Lucent Technologies Inc. | An auxiliary system for assisting a wireless terminal in determining its position from signals transmitted from a navigation satellite |
| US6070078A (en) * | 1997-10-15 | 2000-05-30 | Ericsson Inc. | Reduced global positioning system receiver code shift search space for a cellular telephone system |
| WO1999044073A1 (en) * | 1998-02-27 | 1999-09-02 | Ericsson Inc. | Stand alone global positioning system (gps) and method with high sensitivity |
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Also Published As
| Publication number | Publication date |
|---|---|
| AU7700401A (en) | 2002-01-30 |
| WO2002006847A2 (en) | 2002-01-24 |
| KR20030017641A (en) | 2003-03-03 |
| KR101049836B1 (en) | 2011-07-15 |
| HK1057781A1 (en) | 2004-04-16 |
| IL154020A0 (en) | 2003-07-31 |
| JP2015121537A (en) | 2015-07-02 |
| WO2002006847A3 (en) | 2002-06-13 |
| JP2013117536A (en) | 2013-06-13 |
| EP1301802A2 (en) | 2003-04-16 |
| JP2017096940A (en) | 2017-06-01 |
| JP2004517298A (en) | 2004-06-10 |
| CN1454323A (en) | 2003-11-05 |
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