CN101867542B - Intermediate frequency process engine, intermediate frequency carrier removing method and GNSS receiver - Google Patents
Intermediate frequency process engine, intermediate frequency carrier removing method and GNSS receiver Download PDFInfo
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- CN101867542B CN101867542B CN200910252865.6A CN200910252865A CN101867542B CN 101867542 B CN101867542 B CN 101867542B CN 200910252865 A CN200910252865 A CN 200910252865A CN 101867542 B CN101867542 B CN 101867542B
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- intermediate frequency
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Abstract
The invention provides a kind of intermediate frequency process engine, intermediate frequency carrier removing method and GNSS receiver.Wherein, intermediate frequency process engine is used for GNSS receiver, comprises: local oscillator unit, produces multiple carrier waves with different frequency; Intermediate frequency down converter, respectively by the carrier frequency mixing that multiple intermediate-freuqncy signal and local oscillator unit produce, to produce multiple signal segment having removed intermediate frequency carrier; Time division multiplexing controller, each mixing operation of scheduling intermediate frequency down converter; And buffer, store the signal segment removing intermediate frequency carrier that intermediate frequency down converter produces.Multiple intermediate frequency carrier in intermediate-freuqncy signal with different frequency, by making the spread-spectrum signal with different carrier frequencies share an intermediate frequency process engine, can be removed by intermediate frequency process engine provided by the invention, intermediate frequency carrier removing method and GNSS receiver.
Description
Technical field
The invention relates to a kind of intermediate frequency process engine, intermediate frequency carrier removing method, and GLONASS (Global Navigation Satellite System) (GlobalNavigationSatelliteSystem, hereinafter referred to as GNSS) receiver, and particularly about a kind of by have different carrier frequencies multiple spread-spectrum signals (spreadspectrumsignal) the intermediate frequency (intermediatefrequency that shares, hereinafter referred to as IF) processing engine (processingengine), by the IF carrier wave removing method that multiple IF carrier waves in IF signal with different frequency remove, and use the GNSS receiver of this IF processing engine.
Background technology
At present, existing multiple operable GNSS, comprise: global positioning system (GlobalPositioningSystem, hereinafter referred to as GPS), Galileo (Galileo) system and GLONASS (Global Navigation Satellite System) (GLObalNAvigationSatelliteSystem, hereinafter referred to as GLONASS).GPS employing code division multiple access (CodeDivisionMultipleAccess, hereinafter referred to as CDMA).Namely, in GPS, the signal that passing of satelline modulation has each satellite of different PRN code (pseudo-randomnoisecode, pseudo noise code) is distinguished mutually.GLONASS uses frequency division multiple access (FrequencyDivisionMultipleAccess, hereinafter referred to as FDMA).Namely, in GLONASS, the passing of satelline uses different carrier frequencies mutually to distinguish.What table 1 showed is GLONASS carrier frequency in L1 and L2 subband.
| Channel number | The nominal value (unit: MHz) of L1 sub band medium frequency | Channel number | The nominal value (unit: MHz) of L2 sub band medium frequency |
| 13 | 1609.3125 | 13 | 1251.6875 |
| 12 | 1608.75 | 12 | 1251.25 |
| 11 | 1608.1875 | 11 | 1250.8125 |
| 10 | 1607.625 | 10 | 1250.375 |
| 09 | 1607.0625 | 09 | 1249.9375 |
| 08 | 1606.5 | 08 | 1249.5 |
| 07 | 1605.9375 | 07 | 1249.0625 |
| 06 | 1605.375 | 06 | 1248.625 |
| 05 | 1604.8125 | 05 | 1248.1875 |
| 04 | 1604.25 | 04 | 1247.75 |
| 03 | 1603.6875 | 03 | 1247.3125 |
| Channel number | The nominal value (unit: MHz) of L1 sub band medium frequency | Channel number | The nominal value (unit: MHz) of L2 sub band medium frequency |
| 02 | 1603.125 | 02 | 1246.875 |
| 01 | 1602.5625 | 01 | 1246.4375 |
| 00 | 1602.0 | 00 | 1246.0 |
| -01 | 1601.4375 | -01 | 1245.5625 |
| -02 | 1600.8750 | -02 | 1245.1250 |
| -03 | 1600.3125 | -03 | 1244.6875 |
| -04 | 1599.7500 | -04 | 1244.2500 |
| -05 | 1599.1875 | -05 | 1243.8125 |
| -06 | 1598.6250 | -06 | 1243.3750 |
| -07 | 1598.0625 | -07 | 1242.9375 |
Table 1
Fig. 1 is the schematic diagram of modern GNSS receiver 100 basic structure according to prior art.Receiver 100 comprises: antenna 101, radio frequency (radiofrequency, hereinafter referred to as RF) front end (frontend) 112, IF low-converter (down-converter) 123, local oscillator 128, correlator engine (correlatorengine) 130, correlator memory 135, local code generator 147, and processor 150.Receiver 100 receives the satellite-signal in RF frequency band via antenna 101.The RF signal received is down-converted to IF signal in RF front end 112, and is amplified.IF signal is transmitted (passto) to IF low-converter 123.IF signal is down-converted to baseband signal by the IF carrier wave that IF low-converter 123 is provided by use local oscillator 128.Baseband signal is transferred to correlator engine 130, and the code coming to provide with local code generator 147 is correlated with.Correlated results is stored in correlator memory 135, is used for accumulating.Processor 150 processes the accumulation of this correlated results and/or correlated results, to produce position-Velocity-time (position-velocity-time, hereinafter referred to as PVT) information.In this structure, IF carrier frequency is only to be a fixed value.But in practice, the spread-spectrum signal (spreadspectrumsignal) from different satellite (satellite such as, in above-described GLONASS) or different GNSS system may use different carrier waves.Namely, the carrier frequency of the spread-spectrum signal received is not identical.Therefore, existing receiver (such as, GLONASS receiver) uses multiple IF carrier wave to remove module, promotes the efficiency of satellite search and tracking.Multiple IF carrier wave removes each in module for specific carrier frequency.
Summary of the invention
For solving above technical problem, the invention provides a kind of IF processing engine, IF carrier wave removing method and GNSS receiver.
The invention provides a kind of IF processing engine, for GNSS receiver, comprise: local oscillator unit, produce multiple carrier waves with different frequency; IF low-converter, respectively by the carrier frequency mixing that multiple IF signal and local oscillator unit produce, produces multiple signal segment having removed IF carrier wave; Time division multiplexing controller, each mixing operation of scheduling IF low-converter; And buffer, store the signal segment removing IF carrier wave that IF low-converter produces.
The present invention separately provides a kind of IF carrier wave removing method, and for GNSS receiver, removed by multiple IF carrier waves in IF signal with different frequency, IF carrier wave removing method comprises: produce multiple carrier waves with different frequency; Based on time division multiplexing dispatching, respectively by carrier wave and the mixing of IF signal, produce the signal segment removing IF carrier wave; And described in storing, removed the signal segment of IF carrier wave.
The present invention separately provides a kind of GNSS receiver, comprises: RF front end, and RF signal is down-converted to IF signal; IF processing engine, provides multiple carrier waves with different frequency, and by using carrier wave that IF signal is down-converted to baseband signal in time division multiplexing dispatching; And correlator engine, baseband signal is carried out relevant to code, produces multiple correlated results.
Multiple intermediate frequency carrier in intermediate-freuqncy signal with different frequency, by making the spread-spectrum signal with different carrier frequencies share an intermediate frequency process engine, can be removed by IF processing engine provided by the invention, IF carrier wave removing method and GNSS receiver.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the basic structure of modern GNSS receiver according to prior art.
Fig. 2 is the schematic diagram of the GNSS receiver according to first embodiment of the invention.
Fig. 3 is the schematic diagram of the IF processing engine according to embodiment of the present invention.
4A figure is the schematic diagram of the general NCO according to embodiment of the present invention.
4B figure is the schematic diagram according to the analog waveform of the NCO of embodiment of the present invention and true mapping table.
Fig. 5 is the schematic diagram of the TDM scheduling mechanism according to embodiment of the present invention.
Fig. 6 is the schematic diagram of the IF processing engine according to another execution mode of the present invention.
Fig. 7 is the schematic diagram of the IF processing engine according to another execution mode of the present invention.
Fig. 8 is the schematic diagram of the IF processing engine according to another execution mode of the present invention.
Fig. 9 is according to embodiment of the present invention in GNSS receiver, removes the method flow diagram of multiple IF carrier waves with different frequency from multiple IF signal.
Embodiment
Some vocabulary is employed to refer to specific element in the middle of this specification and claims.Those skilled in the art should understand, and hardware manufacturer may call same element with different nouns.This specification and claims not using the difference of title as the mode of distinguish one element from another, but using element difference functionally as the criterion distinguished." comprising " mentioned in the middle of specification and claim is in the whole text an open term, therefore should be construed to " comprise but be not limited to ".In addition, " couple " word comprise directly any at this and be indirectly electrically connected means.Therefore, if describe first device in literary composition to be coupled to the second device, then represent first device and can directly be electrically connected in the second device, or be indirectly connected electrically to the second device by other device or connection means.
Fig. 2 is the schematic diagram of the GNSS receiver 200 according to first embodiment of the invention.The basic structure of receiver 200 is similar to the receiver 100 shown in Fig. 1, and the element of same names has similar function, therefore, omits the description to these elements here.Receiver 200 is that receiver 200 has IF processing engine 220 with the main distinction of receiver 100, is used for converting the IF signal with different carrier frequencies from RF front end 212 to baseband signal.
Fig. 3 is the schematic diagram of the IF processing engine 220 according to embodiment of the present invention.In this embodiment, IF processing engine 220 comprises: IF low-converter 223, multiplexer (multiplexer) 224, time division multiplexing (timedivisionmultiplex, hereinafter referred to as TDM) controller 225, local oscillator unit (being made up of multiple local oscillator 228), and buffer 229.Wherein, each local oscillator 228 can pass through digital controlled oscillator (numericalcontrolledoscillator, hereinafter referred to as NCO) and simply realizes.Such as, as can be seen from Figure 3, the local oscillator unit of IF processing engine 220 comprises three local oscillators 228.Each local oscillator 228 produces different carrier waves, namely, produces multiple carrier waves with different frequency.Multiple carrier wave is scheduled (schedule) for be sequentially transferred to IF low-converter 223 by multiplexer 224, and wherein, multiplexer 224 is controlled by TDM controller 225.Accordingly, the IF signal of reception is carried out down-conversion by IF low-converter 223 under TDM mode (TDMmanner).The result of down-conversion is stored in buffer 229.
Fig. 4 A is the basic structure schematic diagram of the general NCO28 according to embodiment of the present invention.Fig. 4 B is the analog waveform (waveform) of NCO28 according to embodiment of the present invention and the schematic diagram of true mapping table (mappingtruetable).Each local oscillator 228 described in embodiment of the present invention can be realized by NCO28.Other any suitable oscillator also can with in the present invention.NCO28 comprises: adder 281, holding register (holdingregister) 283, Cosine mapping unit (COSmapunit, hereinafter referred to as COS map unit) 285, and sine-mapping unit (SINmapunit, hereinafter referred to as SIN map unit) 287.Clock clkfs is transfused to (feedto) to holding register 283, by the frequency deciding NCO28.Adder 281 is according to speed (clockrate) excute phase accumulation (phaseaccumulation) of clock clkfs.Accumulation result (namely, NCO phase place) is used for accumulating by feedback next time.Accumulation output is transferred to COS map unit 285 or SIN map unit 287, is used for performing look-up table (look-uptable, hereinafter referred to as LUT) operation, thus the cosine wave of Output simulation (simulate) or sine wave.By controlling the accumulation step in adder 281, output frequency can be adjusted.Fig. 4 B shows the simple examples for the simulation waveform in LUT operation and true mapping table.
Such as, in the execution mode shown in Fig. 3, IF processing engine 220 comprises three local oscillators 228.Fig. 5 is the schematic diagram of the TDM scheduling mechanism according to embodiment of the present invention.Time slot (timeslot) scheduling of the multiplexer 224 that the line display being positioned at the top in Fig. 5 is controlled by TDM controller 225, i.e. TDM scheduling.The IF signal that second line display receives.The third line represents the multiple carrier wave LO produced by multiple local oscillator 228 respectively
0, LO
1, LO
2.The a line being arranged in bottom in Fig. 5 shows the spread-spectrum signal (IFremovedspreadspectrumsignal) removing IF carrier wave being stored in buffer 229.As shown in Figure 5, time slot is assigned to IF
0, IF
1, IF
2.For time t=i, at time slot IF
0in, carrier wave LO
0with IF signal i mixing, produce the section SSS of the spread-spectrum signal removing IF carrier wave
i, 0; At time slot IF
1in, carrier wave LO
1with IF signal i mixing, produce the section SSS of the spread-spectrum signal removing IF carrier wave
i, 1; At time slot IF
2in, carrier wave LO
2with IF signal i mixing, produce the section SSS of the spread-spectrum signal removing IF carrier wave
i, 2; For time t=i+1, t=i+2..., scheduling mode is identical with the above.
In this embodiment, the operation rate of each module in IF processing engine 220 is three times of IF signal frequency.Namely, in fig. 2, the operation rate of IF processing engine 220 is three times of the sampling rate of RF front end 212.Within a sampling period, there is the sampling of data mixing of three sample values of each sinusoidal waveforms (sinusoidalwaveform) of different frequency and the IF signal of reception.After mixing, the spread-spectrum signal having removed IF carrier wave is stored in (as shown in Figure 3) in buffer 229, and is sent to the module of will carry out follow-up (subsequent) and process subsequently, such as, and correlator engine 230 and processor 250.
Fig. 6 is the schematic diagram of the IF processing engine 620 according to another execution mode of the present invention.IF processing engine 620 in this execution mode comprises: IF low-converter 623, TDM controller 625, phase latch (phaselatch) 626, local oscillator 628, and buffer 629.As can be seen from Figure 6, the local oscillator unit of IF processing engine 620 only comprises a single local oscillator 628.Local oscillator 628 is realized by NCO.Because the state of NCO can by latching accumulation result (namely, NCO phase place) and be stored easily, can be substituted by single NCO and NCO phase latch for the multiple NCO in the execution mode shown in Fig. 3.The phase latch 626 controlled by TDM controller 625, latches the NCO phase place of each carrier wave, and therefore single local oscillator 628 can produce multiple carrier waves with different frequency under TDM mode.
Fig. 7 is the schematic diagram of the IF processing engine 720 according to another execution mode of the present invention.IF processing engine 720 is similar with the IF processing engine 220 shown in Fig. 3, and the element of same names has similar function, therefore, omits the description to these elements here.IF processing engine 720 is that IF processing engine 720 comprises further with the difference of IF processing engine 220: digital filter bank (digitalfilterbank) 726, wherein, digital filter bank 726 comprises multiple digital filter.Multiple digital filter (not shown) in digital filter bank 726 are used for the noise of respectively filtering baseband signal (namely, having removed the spread-spectrum signal of IF carrier wave), to improve signal performance.Wherein, baseband signal different IF signal down-conversions is got by IF low-converter 723.
Because the different IF signal with different carrier frequencies is down-converted to same base band, so only a digital filter can be used.Fig. 8 is the schematic diagram of the IF processing engine 820 according to another execution mode of the present invention.IF processing engine 720 shown in IF processing engine 820 and Fig. 7 is similar.The two only difference is, IF processing engine 820 use the filtering of single digital filter 826 each by the noise removing the spread-spectrum signal of IF carrier wave handled by IF low-converter 823.In this embodiment, the function of filter is relevant to the state in its past, is therefore necessary for the state that each spread-spectrum signal having removed IF carrier wave latches filter.So the spread-spectrum signal that status latch 827 is used for having removed for each IF carrier wave latches the state of filter.
Although the similar of the structure of the IF processing engine shown in Fig. 7 and Fig. 8 720 and 820 and the IF processing engine 220 shown in Fig. 3, digital filter unit (such as, comprise the digital filter bank of multiple digital filter or have the digital filter of status latch) also can be added in the structure of the IF processing engine 620 shown in Fig. 6.
Fig. 9 is according to embodiment of the present invention in GNSS receiver, removes the method flow diagram of multiple IF carrier waves with different frequency from multiple IF signal.As shown in Figure 9, described method comprises: produce multiple different carrier wave (namely, having multiple carrier waves of different frequency) (step S910); Based on TDM scheduling, by each carrier wave and each IF signal mixing, produce the signal segment (step S920) removing IF carrier wave; And storage has removed the signal segment of IF carrier wave to (step 930) in buffer.As mentioned above, the spread-spectrum signal having removed IF carrier wave stores in a buffer, to be sent to the module by carrying out subsequent treatment, such as, correlator engine and processor, for further use.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention, any those of skill in the art, without departing from the scope of the present invention; can do some to change, the scope that therefore protection scope of the present invention should define with claim is as the criterion.
Claims (20)
1. an intermediate frequency process engine, for GNSS receiver, described intermediate frequency process engine comprises:
Local oscillator unit, produces multiple carrier waves with different frequency;
Multiplexer, connects described local oscillator unit and a time division multiplexing controller respectively, under the control of described time division multiplexing controller, once transmits in the described carrier wave of described local oscillator unit;
Intermediate frequency down converter, respectively by the described carrier frequency mixing that multiple intermediate-freuqncy signal and described local oscillator unit produce, produces multiple signal segment having removed intermediate frequency carrier;
Described time division multiplexing controller, each mixing operation of execution cost intermediate frequency down converter; And
Buffer, stores the described signal segment having removed intermediate frequency carrier that described intermediate frequency down converter produces.
2. intermediate frequency process engine according to claim 1, is characterized in that, described local oscillator unit comprises: multiple local oscillator, and each in described local oscillator produces one in described carrier wave.
3. intermediate frequency process engine according to claim 2, is characterized in that, each in described local oscillator is realized by digital controlled oscillator.
4. intermediate frequency process engine according to claim 1, is characterized in that, described local oscillator unit comprises single local oscillator.
5. intermediate frequency process engine according to claim 4, it is characterized in that, described single local oscillator is realized by digital controlled oscillator, wherein, described digital controlled oscillator, by accumulating multiple digital controlled oscillator phase place in different steps, produces the described carrier wave with different frequency.
6. intermediate frequency process engine according to claim 5, is characterized in that, comprise further: phase latch, latches the described digital controlled oscillator phase place accumulated.
7. intermediate frequency process engine according to claim 1, is characterized in that, comprise further: digital filter unit, the described noise having removed the signal segment of intermediate frequency carrier that intermediate frequency down converter described in filtering produces.
8. intermediate frequency process engine according to claim 7, it is characterized in that, described digital filter unit is realized by the digital filter bank comprising multiple digital filter, wherein, each in described digital filter is transferred in described buffer for the signal segment having removed intermediate frequency carrier described in only allowing and stores, wherein, the described signal segment having removed intermediate frequency carrier is by by described carrier wave and described intermediate-freuqncy signal mixing, down-conversion gets.
9. intermediate frequency process engine according to claim 7, it is characterized in that, described digital filter unit comprises: single digital filter, and described intermediate frequency process engine comprises further: status latch, latch the state of described single digital filter, store to make the signal segment having removed intermediate frequency carrier described in described single digital filter permission be transferred in described buffer, wherein, the described signal segment having removed intermediate frequency carrier is by by described carrier wave and described intermediate-freuqncy signal mixing, down-conversion gets respectively.
10. a GNSS receiver, comprises:
Radio-frequency front-end, down-converts to intermediate-freuqncy signal by radiofrequency signal;
Intermediate frequency process engine, receives and described in down-conversion, intermediate-freuqncy signal is baseband signal, and comprises;
Local oscillator unit, produces multiple carrier waves with different frequency;
Multiplexer, connects described local oscillator unit and time division multiplexing controller respectively, under the control of described time division multiplexing controller, once transmits in the described carrier wave of described local oscillator unit;
Intermediate frequency down converter, respectively by the described carrier frequency mixing that described intermediate-freuqncy signal and described local oscillator unit produce, produces multiple signal segment having removed intermediate frequency carrier;
Described time division multiplexing controller, each mixing operation of execution cost intermediate frequency down converter; And
Buffer, stores the described signal segment having removed intermediate frequency carrier that described intermediate frequency down converter produces; And
Correlator engine, carries out related operation by the code that described baseband signal and local code generator provide, to produce multiple correlated results.
11. GNSS receiver according to claim 10, is characterized in that, the operating rate of described intermediate frequency process engine is many times of radio-frequency front-end operating rate.
12. GNSS receiver according to claim 10, is characterized in that, described local oscillator unit comprises: multiple local oscillator, and each in described local oscillator produces one in described carrier wave.
13. GNSS receiver according to claim 12, is characterized in that, each in described local oscillator is realized by digital controlled oscillator.
14. GNSS receiver according to claim 10, is characterized in that, described local oscillator unit comprises single local oscillator.
15. GNSS receiver according to claim 14, it is characterized in that, described single local oscillator is realized by digital controlled oscillator, wherein, described digital controlled oscillator, by accumulating multiple digital controlled oscillator phase place in different step, produces the described carrier wave with different frequency.
16. GNSS receiver according to claim 15, is characterized in that, comprise further: phase latch, latch the described digital controlled oscillator phase place accumulated.
17. GNSS receiver according to claim 11, is characterized in that, comprise further: digital filter unit, the described noise having removed the signal segment of intermediate frequency carrier that intermediate frequency down converter described in filtering produces.
18. GNSS receiver according to claim 17, it is characterized in that, described digital filter unit is realized by the digital filter bank comprising multiple digital filter, wherein, each in described digital filter is transferred in described buffer for the signal segment having removed intermediate frequency carrier described in only allowing and stores, wherein, the described signal segment having removed intermediate frequency carrier is by by described carrier wave and described intermediate-freuqncy signal mixing, down-conversion gets.
19. GNSS receiver according to claim 17, it is characterized in that, described digital filter unit comprises: single digital filter, and described intermediate frequency process engine comprises further: status latch, latch the state of described single digital filter, store to make the signal segment having removed intermediate frequency carrier described in described single digital filter permission be transferred in described buffer, wherein, the described signal segment having removed intermediate frequency carrier is by by described carrier wave and described intermediate-freuqncy signal mixing, down-conversion gets respectively.
20. 1 kinds of intermediate frequency carrier removing methods, for GNSS receiver, multiple intermediate frequency carrier in intermediate-freuqncy signal with different frequency removed, described intermediate frequency carrier removing method comprises:
Produce multiple carrier waves with different frequency;
Based on time division multiplexing dispatching, control one that once transmits in described carrier wave;
Based on time division multiplexing dispatching, respectively by described carrier wave and described intermediate-freuqncy signal mixing, to produce the signal segment removing intermediate frequency carrier; And
The signal segment of intermediate frequency carrier has been removed described in storage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/326,476 US9124345B2 (en) | 2006-09-01 | 2008-12-02 | If process engine and receiver having the same and method for removing if carriers used therein |
| US12/326,476 | 2008-12-02 |
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| Publication Number | Publication Date |
|---|---|
| CN101867542A CN101867542A (en) | 2010-10-20 |
| CN101867542B true CN101867542B (en) | 2016-04-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8774334B2 (en) * | 2011-11-09 | 2014-07-08 | Qualcomm Incorporated | Dynamic receiver switching |
| US9154356B2 (en) * | 2012-05-25 | 2015-10-06 | Qualcomm Incorporated | Low noise amplifiers for carrier aggregation |
| US9170336B2 (en) * | 2012-10-04 | 2015-10-27 | Aviacomm Inc. | All band GNSS receiver |
| CN106034265B (en) | 2015-03-13 | 2020-01-10 | 上海诺基亚贝尔股份有限公司 | Method and apparatus for hybrid multiplexing/demultiplexing in passive optical networks |
| US10177722B2 (en) | 2016-01-12 | 2019-01-08 | Qualcomm Incorporated | Carrier aggregation low-noise amplifier with tunable integrated power splitter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485383A (en) * | 1980-12-01 | 1984-11-27 | Texas Instruments Incorporated | Global position system (GPS) multiplexed receiver |
| CN1197567A (en) * | 1995-09-25 | 1998-10-28 | 声讯网络公司 | Point-to-point internet protocol |
| CN1842988A (en) * | 2004-09-17 | 2006-10-04 | 松下电器产业株式会社 | Wireless transmission system and wireless transmission method and wireless station and transmitting station for use therein |
-
2009
- 2009-11-27 TW TW98140585A patent/TW201022699A/en unknown
- 2009-11-30 CN CN200910252865.6A patent/CN101867542B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485383A (en) * | 1980-12-01 | 1984-11-27 | Texas Instruments Incorporated | Global position system (GPS) multiplexed receiver |
| CN1197567A (en) * | 1995-09-25 | 1998-10-28 | 声讯网络公司 | Point-to-point internet protocol |
| CN1842988A (en) * | 2004-09-17 | 2006-10-04 | 松下电器产业株式会社 | Wireless transmission system and wireless transmission method and wireless station and transmitting station for use therein |
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| CN101867542A (en) | 2010-10-20 |
| TW201022699A (en) | 2010-06-16 |
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