CN105738928A - GNSS receiver, terminal device and positioning system - Google Patents
GNSS receiver, terminal device and positioning system Download PDFInfo
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- CN105738928A CN105738928A CN201610299118.8A CN201610299118A CN105738928A CN 105738928 A CN105738928 A CN 105738928A CN 201610299118 A CN201610299118 A CN 201610299118A CN 105738928 A CN105738928 A CN 105738928A
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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
- G01S19/34—Power consumption
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Abstract
The invention discloses a GNSS receiver, a terminal device and a positioning system, wherein the GNSS receiver is composed of an antenna, a radio frequency circuit and a base-band circuit; the base-band circuit further comprises an intermediate frequency data write-in unit, a memory and an intermediate frequency data reading unit; the intermediate frequency data write-in unit is used for storing digital intermediate frequency signals output by the radio frequency circuit in the memory; and the intermediate frequency data reading unit is used for responding to a position calculation instruction sent by an external device and reading the digital intermediate frequency signals from the memory, and the digital intermediate frequency signals are used for position calculation. According to the invention, the real-time calculation of the user position is avoided, only the digital intermediate frequency signals output by the radio frequency circuit are stored, and when the external device needs to carry out position calculation, the GNSS receiver provided by the invention or the external device can carry out position calculation by means of the stored digital intermediate frequency signals, so that the power consumption of the GNSS receiver provided by the invention is lower.
Description
Technical field
The application relates to technical field of satellite, more particularly, it relates to a kind of GNSS receiver, terminal unit and alignment system.
Background technology
GNSS (GlobalNavigationSatelliteSystem) is a comprehensive concept, refers to the satellite navigation system of global all operations, including GPS, WAAS and district system.It is currently in operation the global positioning system with implementing plan and has the BDS (BeidouNavigationSatelliteSystem) of the GPS of the U.S., Muscovite GLONASS (GlobalNavigationSatelliteSystem), the GALILEO of European Union and China.And strengthen system and be distributed in multiple country, such as EGNOS (EuropeanGeostationaryNavigationOverlayService), the Muscovite SDCM (SystemofDifferentialCorrectionandMonitoring) of the WAAS (WideAreaAugmentationSystem) of the U.S., Europe.Additionally, also have district system, for instance the QZSS (Quasi-ZenithSatelliteSystem) of Japan and the IRNSS (IndianRegionalNavigationSatelliteSystem) of India.The development of multiple satellite navigation system makes the number of satellite that navigation neceiver can be used for location be significantly increased, and improves user's experience under complex environment greatly so that the degree of accuracy of location, stability and integrity have huge raising.It is introduced below for four main GLONASSs.
1.GPS system
GPS system comes from meridian instrument (Transit) plan started USN sixties in 20th century, by 24 satellite ceaselessly broadcast navigation information that middle low orbit runs, provides global, dynamic, round-the-clock location-based service for receiver user.GPS be most widely used at present, satellite navigation system that system is the most ripe.After being fully immersed use from nineteen ninety-five GPS, GPS modernization project is just set about by U.S. government, constantly advances it to advance.The modern purpose of GPS is the working life of the precision of raising system, availability, reliability and satellite.Its main contents include increasing C/A code at L2 frequency, increase the 3rd civil frequency L5, gps signal system realizes the upgrading of separation of the army from the people and ground control system, it is contemplated that complete in about the year two thousand twenty.
2.GLONASS system
The history of GLONASS system is similar with GPS, the military of the former Soviet Union propose and participate in design, launching last batch of satellite in nineteen ninety-five December, has built up the constellation of 24 satellite compositions.Maximum different of GLONASS and GPS are in that to which employs frequency division multiple access but not the technology of CDMA, and all satellites adopt identical PRN code, have less cross-correlation and better noiseproof feature relative to GPS system.Owing to a lot of satellites are aging, system maintenance shortage of funding, to calendar year 2001, whole constellation deteriorates to 6～8.Later along with the support of the recovery of Russia economy and government, recover the operation completely of 24 satellites in the end of the year 2011.Due to self performance and the stability existing defects of GLONASS system, and its degree of opening wretched insufficiency, result in the development of GLONASS and seriously lag behind GPS.
3.GALILEO system
GALILEO system is to combine, in European Union and European Space Agency, the GPS of new generation started under proposal.It is different from GPS, the system that this system Shi Yige world participates in and invests, it is desirable to provide different types of civilian service.GALILEO space segment is made up of 30 satellites being distributed in 3 orbital planes, and in same place, observable satellite number is better than GPS, and it can better cover high latitude area.Its navigation signal have employed modern BOC signal, broadcasts in E5A, four frequency ranges of E5B, E6 and E2-L1-E1.Up to now, GALILEO system transmits 4 satellites altogether.Although this system prepares to prepare the last decade time, but owing to there is erroneous decision in system organization management and estate planning, its system development is had reached an impasse, and associated transmissions plan is postponed again and again.
BDS system
Beidou satellite navigation system be China implementing independent research, independent operating GPS.It is to grow up on the basis of Big Dipper generation system, and space segment includes 5 stationary orbit (GEO) satellites, 3 inclined plane (IGSO) satellites and 27 middle circular orbit (MEO) satellites.Ending in February, 2014, dipper system has been completely covered the Asian-Pacific area, and provides high-precision positioning service for China and surrounding area thereof, and Big Dipper global system builds up in the year two thousand twenty the most at last.Providing the user numeral message short message service is that it is different from the main feature of other navigation system.Similar with GPS system, dipper system have employed the signal of CDMA, and broadcasts at B1 and B2 two frequency bins, and it can realize the compatibility with GPS system.
Fig. 1 is the structural representation of GNSS receiver in prior art.As it is shown in figure 1, GNSS receiver includes antenna 10, radio circuit 20, baseband circuit 30 form.Wherein, baseband circuit 30 is by catching and following the tracks of circuit 301, flush bonding processor 302, ROM303, RAM304, FLASH305 and interface circuit 306 and form.Described antenna 10 receive GNSS satellite signal laggard enter radio circuit 20, radiofrequency signal carries out after down-conversion operation obtains intermediate-freuqncy signal, baseband circuit 30 is given again through analog-digital converter adc circuit (all integrated adc circuit of general radio circuit, for instance the MAX2769 chip of Maxim company) conversion output digital medium-frequency signal.Described baseband circuit 30 enters after receiving digital medium-frequency signal and catches and follow the tracks of circuit 301, extracts observed quantity information, and observed quantity information is supplied to flush bonding processor 302 from digital medium-frequency signal.Described flush bonding processor 302 is responsible for the control of whole chip and resolves customer location.Flush bonding processor core 302 accesses internal ROM303, internal RAM 304, internal FLASH305 by internal bus.The program that described flush bonding processor 302 runs is positioned at ROM303；Meanwhile, flush bonding processor 302 generally can provide the interface connecting outside FLASH, for accessing the memorizer of off-chip more capacity.In FLASH305 except the program code of storage running, it is additionally operable to storage satellite ephemeris information, temporal information and channel status etc. and carries out auxiliary information required during position calculation.The calculated customer position information of flush bonding processor 302 sends external user to by interface circuit 306.
Development along with GNSS technology, high sensitivity, low-power consumption receiver have become as a kind of development trend, the continuous positioning power consumption of current GNSS receiver chip is tens of milliwatt (with reference to uBlox company UBX-M8030 chip), if it is considered that the power consumption of other peripheral circuits (active antenna, crystal oscillator, memorizer etc.), the power of whole positioner is more than 100 milliwatts.Moving in equipment at some, limited by battery capacity, its working time is subject to bigger restriction.And in some application scenario, user need not obtain position location in real time, but need to record movement locus and carry out subsequent analysis (such as sports fan, vehicle monitoring, wearable device etc.), the requirement that traditional GNSS receiver scheme cannot meet low-power consumption, work long hours.
Summary of the invention
In view of this, this application provides a kind of GNSS receiver, terminal unit and alignment system, for providing the GNSS receiver of a kind of low-power consumption.
To achieve these goals, it is proposed that scheme as follows:
A kind of GNSS receiver, including antenna, radio circuit, the GNSS satellite signal that described antenna is received by described radio circuit carries out down-converted and obtains intermediate-freuqncy signal, and described intermediate-freuqncy signal is carried out analog digital conversion obtain digital medium-frequency signal, described GNSS receiver also includes: baseband circuit, and described baseband circuit includes:
Intermediate frequency data writing unit, memorizer and intermediate frequency data read unit, wherein:
Described intermediate frequency data writing unit is used for, and is stored to described memorizer by the digital medium-frequency signal that described radio circuit exports；
Described intermediate frequency data reads unit and is used for, the position calculation instruction that response external equipment sends, and reads digital medium-frequency signal from described memorizer, and described digital medium-frequency signal is for during for position calculation.
Preferably, described baseband circuit also includes: the down-sampled unit of intermediate frequency data；
The down-sampled unit of described intermediate frequency data is used for, and the digital medium-frequency signal that described radio circuit is exported carries out down-sampled, and sends the data after down-sampled to described intermediate frequency data writing unit.
Preferably, described baseband circuit also includes: radio frequency control unit and real-time clock；
Described real-time clock is used for providing clocking capability；
Described radio frequency control unit is used for, and according to the control logic set, based on the clocking capability of described real-time clock, controls the running status of described radio circuit, and described running status includes work and inoperative.
Preferably, described baseband circuit also includes: baseband processing unit；
Described baseband processing unit is used for, and reads observed quantity information of extracting the intermediate-freuqncy signal of unit output from described intermediate frequency data, and exports described observed quantity information to external equipment, when described observed quantity information is for carrying out position calculation for external equipment.
Preferably, described baseband circuit also includes: baseband processing unit；
Described baseband processing unit is used for, read from described intermediate frequency data the intermediate-freuqncy signal of unit output and extract observed quantity information, and receive the assistance data that external equipment sends, calculate position coordinates according to described observed quantity information and described assistance data, the position coordinates calculated is exported to external equipment.
Preferably, communicated by USB interface between described baseband processing unit with described external equipment.
Preferably, the control logic of memorizer described in logical AND that controls of described intermediate frequency data writing unit matches, and the interface sequence of described intermediate frequency data writing unit and the interface sequence of described memorizer match.
Preferably, described intermediate frequency data reads the control logic of memorizer described in logical AND that controls of unit and matches, and the interface sequence of interface sequence and described memorizer that described intermediate frequency data reads unit matches.
A kind of alignment system, including: GNSS receiver and the equipment of process, wherein:
Described GNSS receiver includes antenna, radio circuit and baseband circuit；
The GNSS satellite signal that described antenna is received by described radio circuit carries out down-converted and obtains intermediate-freuqncy signal, and described intermediate-freuqncy signal is carried out analog digital conversion obtains digital medium-frequency signal；
Described baseband circuit includes: intermediate frequency data writing unit, memorizer and intermediate frequency data read unit, wherein:
Described intermediate frequency data writing unit is used for, and is stored to described memorizer by the digital medium-frequency signal that described radio circuit exports；
Described intermediate frequency data reads unit and is used for, and responds the position calculation instruction that described process equipment sends, and reads digital medium-frequency signal, and export to described process equipment from described memorizer；
Described process equipment is used for, and receives the digital medium-frequency signal of described GNSS receiver output, and carries out position calculation according to described digital medium-frequency signal.
A kind of terminal unit, including GNSS receiver described above.
Can be seen that from above-mentioned technical scheme, the GNSS receiver that the embodiment of the present application provides, it is made up of antenna, radio circuit and baseband circuit, wherein baseband circuit farther includes intermediate frequency data writing unit, memorizer and intermediate frequency data and reads unit, intermediate frequency data writing unit is used for, the digital medium-frequency signal that radio circuit exports is stored to memorizer, intermediate frequency data reads unit and is used for, the position calculation instruction that response external equipment sends, reading digital medium-frequency signal from described memorizer, described digital medium-frequency signal is for during for position calculation.The digital medium-frequency signal that radio circuit is exported by the GNSS receiver that the application provides stores, when the position calculation instruction receiving external equipment, just being read unit by intermediate frequency data and read digital medium-frequency signal from memorizer, this digital medium-frequency signal is for for position calculation.As can be seen here, the application avoids the real-time calculating of customer location, only the digital medium-frequency signal of radio circuit output is stored, when external equipment needs to carry out position calculation, can by the GNSS receiver of the application or external equipment, the digital medium-frequency signal utilizing storage carries out position calculation, and therefore the power consumption of the GNSS receiver of the application is lower.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments herein, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the structural representation of GNSS receiver in prior art；
Fig. 2 is the disclosed a kind of GNSS receiver structural representation of the embodiment of the present application；
Fig. 3 is the disclosed another kind of GNSS receiver structural representation of the embodiment of the present application；
Fig. 4 is the embodiment of the present application another GNSS receiver structural representation disclosed；
Fig. 5 is the embodiment of the present application another GNSS receiver structural representation disclosed.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of the application protection.
Present inventor finds by existing GNSS receiver carries out research, and the GNSS satellite signal that existing GNSS receiver receives according to antenna in real time carries out the calculating of customer location, and its power consumption is very high.And move in equipment at some, and being limited by battery capacity, its working time is subject to bigger restriction.In some application scenario, user need not obtain position location in real time, but need to record movement locus and carry out subsequent analysis (such as sports fan, vehicle monitoring, wearable device etc.), the requirement that traditional GNSS receiver scheme cannot meet low-power consumption, work long hours.
For this, this application provides the GNSS receiver of a kind of low-power consumption, detailed construction is shown in Figure 2.
As in figure 2 it is shown, the GNSS receiver 1 of the application includes:
Antenna 10, radio circuit 20 and baseband circuit 40.
The GNSS satellite signal that described antenna 10 receives is carried out down-converted and obtains intermediate-freuqncy signal by described radio circuit 20, and described intermediate-freuqncy signal is carried out analog digital conversion obtains digital medium-frequency signal；
Described baseband circuit 40 includes:
Intermediate frequency data writing unit 401, memorizer 402 and intermediate frequency data read unit 403, wherein:
Described intermediate frequency data writing unit 401 is used for, and is stored to described memorizer 402 by the digital medium-frequency signal that described radio circuit 20 exports；
Described intermediate frequency data reads unit 403 and is used for, the position calculation instruction that response external equipment 2 sends, and reads digital medium-frequency signal from described memorizer 402, and described digital medium-frequency signal is for during for position calculation.
Optionally, external equipment 2 can be the equipment such as mobile phone, IPAD, computer, car-mounted terminal.External equipment 2 can communicate with GNSS receiver 1, including transmission and the data interaction of signaling.
In the present embodiment, intermediate frequency data reads unit 403 when the position calculation instruction receiving external equipment 2, just reads digital medium-frequency signal from memorizer 402.Digital medium-frequency signal may be used for carrying out position calculation.For utilizing digital medium-frequency signal to carry out the process of position calculation, this process can be just implemented by GNSS receiver, it is also possible to be implemented by external equipment, this application is not done considered critical.
The GNSS receiver that the embodiment of the present application provides, it is made up of antenna, radio circuit and baseband circuit, wherein baseband circuit farther includes intermediate frequency data writing unit, memorizer and intermediate frequency data and reads unit, intermediate frequency data writing unit is used for, the digital medium-frequency signal that radio circuit exports is stored to memorizer, intermediate frequency data reads unit and is used for, the position calculation instruction that response external equipment sends, reading digital medium-frequency signal from described memorizer, described digital medium-frequency signal is for during for position calculation.The digital medium-frequency signal that radio circuit is exported by the GNSS receiver that the application provides stores, when the position calculation instruction receiving external equipment, just being read unit by intermediate frequency data and read digital medium-frequency signal from memorizer, this digital medium-frequency signal is for for position calculation.As can be seen here, the application avoids the real-time calculating of customer location, only the digital medium-frequency signal of radio circuit output is stored, when external equipment needs to carry out position calculation, can by the GNSS receiver of the application or external equipment, the digital medium-frequency signal utilizing storage carries out position calculation, and therefore the power consumption of the GNSS receiver of the application is lower.
It should be noted that the control logic of memorizer 402 described in logical AND that controls of above-mentioned intermediate frequency data writing unit 401 matches, the interface sequence of the interface sequence of described intermediate frequency data writing unit 401 and described memorizer 402 matches.Thus ensureing that intermediate frequency data writing unit 401 can write data in 402.
It should be noted that the control logic of memorizer 402 described in logical AND that controls that intermediate frequency data reads unit 403 matches, the interface sequence of interface sequence and described memorizer 402 that described intermediate frequency data reads unit 403 matches.Thus ensureing that intermediate frequency data reads unit 403 and can read data from memorizer 402.
It is the disclosed another kind of GNSS receiver structural representation of the embodiment of the present application referring to Fig. 3, Fig. 3.
As it is shown on figure 3, GNSS receiver 1 includes:
Antenna 10, radio circuit 20 and baseband circuit 40.
The GNSS satellite signal that described antenna 10 receives is carried out down-converted and obtains intermediate-freuqncy signal by described radio circuit 20, and described intermediate-freuqncy signal is carried out analog digital conversion obtains digital medium-frequency signal；
Described baseband circuit 40 includes:
The down-sampled unit 404 of intermediate frequency data, intermediate frequency data writing unit 401, memorizer 402 and intermediate frequency data read unit 403, wherein:
The down-sampled unit 404 of described intermediate frequency data is used for, and carries out down-sampled to the digital medium-frequency signal of described radio circuit 20 output, and sends the data after down-sampled to described intermediate frequency data writing unit 401；
Described intermediate frequency data writing unit 401 is used for, and receives the digital medium-frequency signal of down-sampled unit 404 output of intermediate frequency data, and stores to described memorizer 402；
Described intermediate frequency data reads unit 403 and is used for, the position calculation instruction that response external equipment 2 sends, and reads digital medium-frequency signal from described memorizer 402, and described digital medium-frequency signal is for during for position calculation.
Comparison diagram 3 and Fig. 2 are it can be seen that the GNSS receiver in the present embodiment further increases the down-sampled unit 404 of intermediate frequency data.The digital medium-frequency signal by the down-sampled unit of intermediate frequency data 404, radio circuit 20 exported in the present embodiment carries out down-sampled, reduce the amount of storage of digital medium-frequency signal, namely the memory space of memorizer is saved, simultaneously because follow-up need digital medium-frequency signal amount to be processed reduces, also reach to reduce the purpose of power consumption.
It is the embodiment of the present application another GNSS receiver structural representation disclosed referring to Fig. 4, Fig. 4.
As shown in Figure 4, GNSS receiver 1 includes:
Antenna 10, radio circuit 20 and baseband circuit 40.
The GNSS satellite signal that described antenna 10 receives is carried out down-converted and obtains intermediate-freuqncy signal by described radio circuit 20, and described intermediate-freuqncy signal is carried out analog digital conversion obtains digital medium-frequency signal；
Described baseband circuit 40 includes:
The down-sampled unit 404 of intermediate frequency data, intermediate frequency data writing unit 401, memorizer 402, intermediate frequency data read unit 403, radio frequency control unit 405 and real-time clock 406, wherein:
The down-sampled unit 404 of described intermediate frequency data is used for, and carries out down-sampled to the digital medium-frequency signal of described radio circuit 20 output, and sends the data after down-sampled to described intermediate frequency data writing unit 401；
Described intermediate frequency data writing unit 401 is used for, and receives the digital medium-frequency signal of down-sampled unit 404 output of intermediate frequency data, and stores to described memorizer 402；
Described intermediate frequency data reads unit 403 and is used for, the position calculation instruction that response external equipment 2 sends, and reads digital medium-frequency signal from described memorizer 402, and described digital medium-frequency signal is for during for position calculation；
Described real-time clock 406 is used for providing clocking capability；
Described radio frequency control unit 405 is used for, and according to the control logic set, based on the clocking capability of described real-time clock 406, controls the running status of described radio circuit 20, and described running status includes work and inoperative.
Wherein, the control logic of radio frequency control unit 405 can according to actual needs by user's sets itself.Such as, user thinks the running route recording roughly oneself under running scene, then can set that and recorded a position every 1 minute.Now, radio frequency control unit 405 can be run once every 1 minute control radio circuit 20, GNSS satellite signal antenna received by radio circuit carries out down-converted and obtains intermediate-freuqncy signal, and described intermediate-freuqncy signal is carried out analog digital conversion obtain digital medium-frequency signal, and then by the down-sampled unit of intermediate frequency data 404 digital medium-frequency signal is carried out down-sampled after, write to memorizer 402 by intermediate frequency data writing unit 401, radio frequency control unit 405 monitors intermediate frequency data writing unit 401 after the success of memorizer 402 write data, control radio circuit 20 to quit work.
Optionally, radio frequency control unit 405 is when controlling the running status of radio circuit 20, it is possible to control whether it works by controlling the power supply of radio circuit 20.In addition, radio frequency control unit 405 can also control radio circuit 20 in a dormant state or wake-up states.
Compared to above-described embodiment, the GNSS receiver in the present embodiment further increases real-time clock and radio frequency control unit, to control the duty of radio circuit, reduce further the power consumption of GNSS receiver.
It is the embodiment of the present application another GNSS receiver structural representation disclosed referring to Fig. 5, Fig. 5.
As it is shown in figure 5, GNSS receiver 1 includes:
Antenna 10, radio circuit 20 and baseband circuit 40.
The GNSS satellite signal that described antenna 10 receives is carried out down-converted and obtains intermediate-freuqncy signal by described radio circuit 20, and described intermediate-freuqncy signal is carried out analog digital conversion obtains digital medium-frequency signal；
Described baseband circuit 40 includes:
The down-sampled unit 404 of intermediate frequency data, intermediate frequency data writing unit 401, memorizer 402, intermediate frequency data read unit 403, radio frequency control unit 405, real-time clock 406 and baseband processing unit 407, wherein:
The down-sampled unit 404 of described intermediate frequency data is used for, and carries out down-sampled to the digital medium-frequency signal of described radio circuit 20 output, and sends the data after down-sampled to described intermediate frequency data writing unit 401；
Described intermediate frequency data writing unit 401 is used for, and receives the digital medium-frequency signal of down-sampled unit 404 output of intermediate frequency data, and stores to described memorizer 402；
Described intermediate frequency data reads unit 403 and is used for, the position calculation instruction that response external equipment 2 sends, and reads digital medium-frequency signal from described memorizer 402；
Described baseband processing unit 407 is used for, read from described intermediate frequency data the intermediate-freuqncy signal of unit 403 output and extract observed quantity information, and by described observed quantity information output to external equipment 2, when described observed quantity information is for carrying out position calculation for external equipment 2；
Wherein, to the mode extracting observed quantity information from intermediate-freuqncy signal, it is possible to reference to prior art, the application repeats no more.
Described real-time clock 406 is used for providing clocking capability；
Described radio frequency control unit 405 is used for, and according to the control logic set, based on the clocking capability of described real-time clock 406, controls the running status of described radio circuit 20, and described running status includes work and inoperative.
In the GNSS receiver that the present embodiment provides, further increase baseband processing unit, baseband processing unit extracts observed quantity information from digital medium-frequency signal, and then exports to external equipment by observed quantity information, external equipment carry out position calculation according to observed quantity information.
Unlike the embodiments above is, baseband processing unit can be also used for, read from described intermediate frequency data the intermediate-freuqncy signal of unit 403 output and extract observed quantity information, and receive the assistance data that external equipment 2 sends, calculate position coordinates according to described observed quantity information and described assistance data, the position coordinates calculated is exported to external equipment 2.
That is, user is when needs carry out position calculation, it is possible to GNSS receiver is set up with external equipment and is connected, it is possible to use it is powered by civil power or other power-supply device.Now, the auxiliary information of position calculation is obtained by external equipment, such as satellite ephemeris information etc., and then auxiliary information is sent to baseband processing unit 407, the observed quantity information of extraction and the auxiliary information of reception is utilized by baseband processing unit 407, calculate position, and calculated positional information is exported to external equipment 2.
As seen from the above-described embodiment, very flexible for the process of position calculation in the application, it is summarized as follows:
First: the digital medium-frequency signal stored in memorizer can be directly output to external equipment by GNSS receiver, external equipment utilize digital medium-frequency signal to extract observed quantity information the auxiliary information according to Network Capture, calculate position；
Second: digital medium-frequency signal can be extracted observed quantity information by baseband processing unit by GNSS receiver, and then the observed quantity information of extraction is directly output to external equipment, external equipment calculate position according to observed quantity information and auxiliary information；
3rd: digital medium-frequency signal can be extracted observed quantity information by baseband processing unit by GNSS receiver, and received, by baseband processing unit, the auxiliary information that external equipment sends, and then utilized observed quantity information and auxiliary information to calculate position by baseband processing unit, calculated positional information is exported to external equipment.
Wherein, when communicating between baseband processing unit with external equipment, it is possible to communicate according to USB interface, or other communication mode.
The embodiment of the present application provides a kind of terminal unit, and this terminal unit includes the GNSS receiver described in each embodiment above-mentioned.
The embodiment of the present application additionally provides a kind of alignment system, and this alignment system includes: GNSS receiver and the equipment of process, wherein:
Described GNSS receiver can include antenna, radio circuit and baseband circuit；
The GNSS satellite signal that described antenna is received by described radio circuit carries out down-converted and obtains intermediate-freuqncy signal, and described intermediate-freuqncy signal is carried out analog digital conversion obtains digital medium-frequency signal；
Described baseband circuit may include that intermediate frequency data writing unit, memorizer and intermediate frequency data read unit, wherein:
Described intermediate frequency data writing unit is used for, and is stored to described memorizer by the digital medium-frequency signal that described radio circuit exports；
Described intermediate frequency data reads unit and is used for, and responds the position calculation instruction that described process equipment sends, and reads digital medium-frequency signal, and export to described process equipment from described memorizer；
Described process equipment is used for, and receives the digital medium-frequency signal of described GNSS receiver output, and carries out position calculation according to described digital medium-frequency signal.
Finally, it can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the application.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein when without departing from spirit herein or scope, can realize in other embodiments.Therefore, the application is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a GNSS receiver, including antenna, radio circuit, the GNSS satellite signal that described antenna is received by described radio circuit carries out down-converted and obtains intermediate-freuqncy signal, and described intermediate-freuqncy signal is carried out analog digital conversion obtain digital medium-frequency signal, it is characterized in that, described GNSS receiver also includes: baseband circuit, and described baseband circuit includes:
Intermediate frequency data writing unit, memorizer and intermediate frequency data read unit, wherein:
Described intermediate frequency data writing unit is used for, and is stored to described memorizer by the digital medium-frequency signal that described radio circuit exports；
Described intermediate frequency data reads unit and is used for, the position calculation instruction that response external equipment sends, and reads digital medium-frequency signal from described memorizer, and described digital medium-frequency signal is for during for position calculation.
2. GNSS receiver according to claim 1, it is characterised in that described baseband circuit also includes: the down-sampled unit of intermediate frequency data；
The down-sampled unit of described intermediate frequency data is used for, and the digital medium-frequency signal that described radio circuit is exported carries out down-sampled, and sends the data after down-sampled to described intermediate frequency data writing unit.
3. GNSS receiver according to claim 1, it is characterised in that described baseband circuit also includes: radio frequency control unit and real-time clock；
Described real-time clock is used for providing clocking capability；
Described radio frequency control unit is used for, and according to the control logic set, based on the clocking capability of described real-time clock, controls the running status of described radio circuit, and described running status includes work and inoperative.
4. the GNSS receiver according to any one of claim 1-3, it is characterised in that described baseband circuit also includes: baseband processing unit；
Described baseband processing unit is used for, and reads observed quantity information of extracting the intermediate-freuqncy signal of unit output from described intermediate frequency data, and exports described observed quantity information to external equipment, when described observed quantity information is for carrying out position calculation for external equipment.
5. the GNSS receiver according to any one of claim 1-3, it is characterised in that described baseband circuit also includes: baseband processing unit；
Described baseband processing unit is used for, read from described intermediate frequency data the intermediate-freuqncy signal of unit output and extract observed quantity information, and receive the assistance data that external equipment sends, calculate position coordinates according to described observed quantity information and described assistance data, the position coordinates calculated is exported to external equipment.
6. GNSS receiver according to claim 5, it is characterised in that communicated by USB interface between described baseband processing unit with described external equipment.
7. the GNSS receiver according to any one of claim 1-3, it is characterized in that, the control logic of memorizer described in logical AND that controls of described intermediate frequency data writing unit matches, and the interface sequence of described intermediate frequency data writing unit and the interface sequence of described memorizer match.
8. the GNSS receiver according to any one of claim 1-3, it is characterized in that, described intermediate frequency data reads the control logic of memorizer described in logical AND that controls of unit and matches, and the interface sequence of interface sequence and described memorizer that described intermediate frequency data reads unit matches.
9. an alignment system, it is characterised in that including: GNSS receiver and the equipment of process, wherein:
Described GNSS receiver includes antenna, radio circuit and baseband circuit；
The GNSS satellite signal that described antenna is received by described radio circuit carries out down-converted and obtains intermediate-freuqncy signal, and described intermediate-freuqncy signal is carried out analog digital conversion obtains digital medium-frequency signal；
Described baseband circuit includes: intermediate frequency data writing unit, memorizer and intermediate frequency data read unit, wherein:
Described intermediate frequency data writing unit is used for, and is stored to described memorizer by the digital medium-frequency signal that described radio circuit exports；
Described intermediate frequency data reads unit and is used for, and responds the position calculation instruction that described process equipment sends, and reads digital medium-frequency signal, and export to described process equipment from described memorizer；
Described process equipment is used for, and receives the digital medium-frequency signal of described GNSS receiver output, and carries out position calculation according to described digital medium-frequency signal.
10. a terminal unit, it is characterised in that include the GNSS receiver described in any one of claim 1-8.
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| CN201610299118.8A CN105738928A (en) | 2016-05-06 | 2016-05-06 | GNSS receiver, terminal device and positioning system |
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| CN111208537A (en) * | 2020-03-20 | 2020-05-29 | 上海井融网络科技有限公司 | GNSS receiver and data transmission method thereof |
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Application publication date: 20160706 |