CN1155663A - GPS (Global positioning system) ready digital cellular telephone - Google Patents

Abstract

A cellular telephone system has an antenna for receiving a location system signal and a cellular signal, a location system receiver and a mobile radio telephone transceiver coupled to the antenna, and a processor coupled to the global positioning system receiver and to the cellular telephone transceiver. The global positioning system receiver employs a GPS demodulator for demodulating a first position signal, a second position signal, and a third position signal from first, second and third earth orbit satellites. The cellular telephone transceiver employs a receive channel for demodulating an incoming portion of the cellular signal, and a transmit channel for modulating an outgoing intermediate signal and for generating an outgoing portion of the cellular signal.

Description

Utilize the digital cellular telephone of ready-made GPS

The present invention relates to a kind of composite type positioning system, the receiver of GPS (GPS) for example, with the phone transmitter-receiver, digital cellular telephone transmitter-receiver for example, wherein the processing resource of digital cellular telephone also is used to realize the function of GPS receiver.

In a kind of system that has been applied aspect navigation and the moving target location is the NAVSTAR GPS.Except NAVSTAR, for example GEOSTAR and GLONASS or develop according to other system of satellite-signal.Use the system of global signal for example to be the LORAN system.

Regrettably, in order to use these signals, GPS and other radio positioning system need a large amount of investments aspect receiving equipment.Particularly, GPS needs the L-frequency-band antenna and is contained in indoor GPS receiving system, and they generally are that expense is higher.

In order to provide positional information to a base station, GPS receiver and honeycomb fashion mobile device are combined, yet erect image is previously presented the same in such system, have to very little or do not obtain cost benefit.In the patent No. is a kind of like this system of introducing in 5043736 the United States Patent (USP), wherein GPS receiver and cellular phone is combined, and makes the positional information that is produced by the GPS receiver can utilize the honeycomb fashion transmitter-receiver to send to the base station.By shown in it, GPS receiver and cell phone respectively are systems independently, and the positional information that its formation produces the GPS receiver can be led to cellular phone, and make control and synchronizing information lead to the GPS receiver by cellular phone.

The invention provides for example digital cellular telephone transmitter-receiver of a kind of comprehensive positioning system (for example GPS) receiver and radio telephone, wherein the processing resource of digital cellular telephone also can be used to realize the function as GPS receiver.

The present invention is characterized in that and can adopt as a telephone system: antenna, positioning system receiver, phone transmitter-receiver and a processor.This antenna receiving position signal and telephone signal, preferably include electric on the antenna of mechanically independent coupling, its tuning each signal that is used to receive these signals.Particularly, preferably the L-frequency-band antenna is used to receive gps signal, the UHF antenna is used to receive telephone signal.This antenna is connected on GPS receiver and the cell phone transmitter-receiver.

GPS receiver utilizes the GPS detuner to constituting primary importance signal, second place signal and the three position singal demodulation of gps signal.First, second and three position singal are to be sent by first, second and the 3rd earth-orbiting satellite respectively, and the GPS detuner produces the digital data stream in response to the demodulation of these signals.

The cell phone transmitter-receiver has a receive channel, transmitting channel and interface circuit.Receive channel is connected to antenna, to cellular signal come to the part demodulation and in producing in response to this demodulation () (rate) comes to signal frequently.Similarly, the transmitting channel that is coupled to antenna equally is to the modulation of whereabouts intermediate-freuqncy signal and produce whereabouts part in response to the cellular signal of this modulation.

Interface circuit is coupled to receive channel and transmitting channel.Interface circuit in the future to intermediate-freuqncy signal be transformed to digital signal, and be the intermediate-freuqncy signal of whereabouts with the whereabouts digital signal conversion.

Processor is coupled to GPS receiver and cell phone transmitter-receiver and shared by them.In fact, processor is regulated by a fixer system, and determines the apparent position at cell phone system place under the control of this fixer system.Thisly determine to be based on that the positional information that comprises in the digital data stream that is provided by the GPS receiver makes.In addition, processor is encoded to the whereabouts sound information signal, produces the whereabouts intermediate-freuqncy signal.Processor also to come to intermediate-freuqncy signal decode, produce to sound information signal.As known in the prior art, sound information signal is used for the acoustic information to the loudspeaker of cell phone system enclosure interior and microphone input and output analog quantity.

Therefore, in the above-described embodiments, be provided with a cell phone system, wherein the processing resource of digital cellular telephone is also with the function that realizes as GPS receiver.Handle resource shared cause more superior than the cost-effectiveness aspect that is combined in design of existing location receiver and phone transmitter-receiver.

As a kind of modification, the foregoing description has display, for example a LCD.Display is connected to processor, with according to the shows signal display message.Shows signal is to be produced by the apparent position of processor according to determined cell phone system, and the information of demonstration is indicated this approximate position.For example the information of Xian Shiing can be latitude, longitude and the height above sea level of determined apparent position.

In this flexible program, the operating personnel of cell phone system can use the position that the present invention is shown cell phone system with visual way.After showing this information, for example operating personnel just can be with the information that shows, for example motor-vehicle accident, crime material evidence or automobile situation such as fall is circulated a notice of ambulance paramedic to emergency in the speech mode.

By following the present invention being introduced more specifically of expression in conjunction with the accompanying drawings, will make above-mentioned and others, feature and advantage of the present invention become more obvious, wherein:

This figure is according to the calcspar of the composite set of one embodiment of the invention formation, GPS (GPS) receiver and digital cellular telephone transmitter-receiver.

To the following introduction of thinking to realize best mode of the present invention at present understandings of should not getting on from the meaning that limits, its purpose only is to introduce total principle of the present invention.Protection scope of the present invention should be determined with reference to claim.

Consult this figure, shown in the front end 10 of GPS (GPS) receiver be connected to L-frequency-band antenna and digital signal processor 14 (dsp controller).Be shown with cellular front end 16 (or honeycomb fashion transmitter-receiver) in addition and be connected to UHF antenna 18 and dsp controller 14.Dsp controller 14 is connected to user display 20, for example light emitting diode (LED) display or LCD (LCD).GPS receiver 10, honeycomb transmitter-receiver 16, dsp controller 14 and user display 12 all are contained in housing 22 inside of honeycomb transmitter-receiver, and erect image is known in the prior art like that.Should note, in fact honeycomb transmitter-receiver housing 22 can use two housings, one is used to hold radio-frequency (RF) component and some digital element, and another is used to hold remaining digital element and as cellular handset, erect image is commonly known in the art like that.When using two housings, use spirality ＂ telephone bandset ＂ cable to link together at each element of two enclosure interior.

In GPS receiver 10 inside, L-frequency-band antenna 12 is connected to radio circuit front end 24.Radio circuit front end 24 is L-band radio frequencies receivers, and it produces respectively the intermediate-freuqncy signal (IF) in response to the first, second, third and the 4th position signalling 26,28,30,32 that is received by the first, second, third and the 4th earth-orbiting satellite 34,36,38,40.Though it is preferred it should be noted that 4 position signallings, ground location can only be determined according to three sort signals.If yet need sea level elevation information, in order to determine that this information the 4th position signalling also is necessary.At two L-frequency bands, receive above-mentioned position signalling on frequency 1575.42 megahertzes and 1227.6 megahertzes.1.023 pseudorandom (PRN) extended code that megahertz is wide synchronously need be on the frequency of 1575.42 megahertzes.Each signal from 4 earth-orbiting satellites 34,36,38 and 40 arrives GPS receiver front end 10 with above-mentioned L-frequency band.Each position signalling 26,28,30,32 has different pseudorandom extended codes.(not getting rid of synchronizing capacity in the present embodiment) to the wide extended code of 10.23 megahertzes.

Deliver to radio circuit front end 24 by the signal that L-frequency-band antenna 12 receives.The design of suitable radio circuit front end is known in the present technique field.In radio circuit front end inside, after a low noise amplifier (LNA) is connected in L-frequency band preselection filter.One comprises that the low-converter design of frequency synthesizer, frequency mixer and intermediate frequency (IF) amplifier has suitable auxiliary circuit, so that keep the noise figure (NF) of system and form the interception point (IP) of expecting.The design of this low-converter is known in the present technique field.The low-converter of cascade, multistage low-converter or the low-converter with many IF output can be used to improve performance.(can be that the inventor considers) by the intermediate frequency output of the wide PRN sign indicating number of 10.23 megahertzes.

The intermediate frequency (IF) of selecting sampling and sorting circuit 46 work to be suitable for.The specific embodiments that is used to implement present embodiment is depended in the selection of intermediate frequency, particularly sampling and sorting circuit 46.

In GPS receiver 10, radio circuit front end 24 is connected to bandpass filter 42, makes intermediate frequency (IF) signal by wherein passing through.

Bandpass filter 42 is intermediate frequency (IF) bandpass filter 42 of a lower frequency, is used for attenuate acoustic noise before the IF signal carries out digitizing.The centre frequency of bandpass filter 42 is less than 30 megahertzes, about 1 megahertz of bandwidth (for the GPS C/A coded signal of low resolution) or about 10 megahertzes (for the GPS P coded signal of high-resolution).

In GPS receiver 10, bandpass filter 42 is connected to automatic gain controller 44, and its IF signal that amplifies as required or decay is so that be provided with the digitized threshold value of an appropriate signals.

Automatic gain controller 44 is connected to sampling and sorting circuit 46, and this circuit carries out digital sampling and filtering to the IF signal that amplifies from the footpath of automatic gain controller 44 or decay.The position signalling 26,28,30,32 that sampling and sorting circuit 46 are received in optimal threshold is used for operation, and produces the homophase of position signalling 26,28,30,32 and the sampled signal of quadrature by this position signalling 26,28,30,32.Sampling and sorting circuit 46 preferably adopt the sampling rate that is at least the Nyquist sampling rate.

Sampling and sorting circuit 46 are connected to GPS (GPS) special IC 48 (ASIC).GPS ASIC 48 is received the IF signal of digitized and digital filtering by sampling and sorting circuit 46.GPS ASIC48 utilizes high precision time benchmark very that the pseudo-random code from the expansion of satellite 34,36,38,40 is gone expansion, and this is known in the present technique field.In the design of GPS ASIC 48, usually can be simultaneously the signal of 3 to 8 channels be gone expansion.

GPS ASIC 48 tracking satellite signals and measurement are with reference to (TOA) and to DPS (bits per second) data of inserting in the spread spectrum signal carrying out demodulation the time of arrival (Time of Arrival) of its local time.The structural design of GPS ASIC 48 known, its case representation is in the ＂ TIDGET-GDS module ＂ at a low price of 1990 Colorado NAVSYS company.A kind of suitable GPS ASIC 48 is known general integrated circuit.Yet the present invention preferably uses a kind of GPS ASIC of simplification to come to extract GPS information from the IF signal extension spectrum modulation of digitizing and digital filtering.The GPS ASIC that simplifies can more inexpensively produce than present commercially available GPS ASIC, therefore, utilizes present embodiment can further improve the ratio of performance to price.

GPS ASIC 48 is also connected to automatic gain control circuit, and the gain or the decay of the signal that is provided by automatic gain control circuit 44 according to the function adjusting of the amplitude of the IF signal of digitizing that receives from sampling and sorting circuit and digital filtering.Therefore, GPSASIC 48 with automatic gain control circuit 44 as a close-loop feedback control system, so that in response to the increase or the reduction of the IF signal amplitude of digital filtering, reduce and increase the amplitude (or increasing and reduce decay) that provides by automatic gain control circuit 44.

GPS ASIC 48 is connected to DPS controller 14, and will deliver to dsp controller 14 by the GPS information of the IF signal extraction of digitized and digital filtering.

Digital signal processor 14 extract to GPS information data, TOA measured value and satnav message and according to triangulation executing location estimation algorithm.Digital signal processor 14 also is used for upgrading and correcting algorithm according to the Kalman Filter Technology executing location, and this response is produced position signalling.The Kalman filter design is being known in the art.High-precision position renewal can per second be carried out once or faster.In order to obtain the required cold start detection time of position coordinates usually between 15 to 20 seconds.For the GPS receiver of 3 to 5 channels, lose after the momentary signal, regain this position coordinates required time less than 5 seconds.

After producing position signalling in such a way, dsp controller 14 send user display 20 with position signalling, and this display is optionally according to latitude, longitude and preferably also have sea level elevation to show the position of the integration unit of GPS receiver and cell phone transmitter-receiver.This display preferably only when SPST momentary switch (for example, ＂ position ＂ button, or the ＂ second function ＂ key for example can find on the keyboard on the cellular handset 49 usually with numerical key) is closed, just shows this position.Keyboard 49 is connected to dsp controller 24.By operation display optionally in this manner, the benefit of bringing is that the integration unit of GPS receiver and cell phone transmitter-receiver can reduce from the power value that the power supply 51 that is connected on GPS receiver and the cell phone transmitter-receiver consumes.Power supply 51 is also connected to dsp controller 14, keyboard 49 and display 20.

After the SPST momentary switch discharged, display 20 can be within the predetermined time, as the 10 seconds continuous display position information and the indication in elapsed time.The indication in elapsed time is represented by utilizing present embodiment to determine that last position coordinates plays elapsed time.During not selecting GPS-capable, forbid the indication of display position information and elapsed-time standards.

It should be noted that in certain embodiments, determined latitude, longitude and sea level elevation be not be presented at display 20 or on being presented at display 20, can utilize honeycomb transmitter-receiver 16 to send to base station 54, will introduce below.This transmission can be pressed according to the ＂ position ＂ button on keyboard 49 and carry out, and perhaps sends according to the request signal that is sent by base station 54.Yet these embodiment are not preferred, because they require existing honeycomb basic facilities are carried out great transformation.

In the inside of honeycomb transmitter-receiver 16, UHF antenna 18 is connected to diplexer 50.Diplexer 50 passes on whereabouts radiofrequency signal 52 (or whereabouts cellular signal) to UHF antenna 18, so that send to base station 54.In addition, diplexer 50 receives by base station 54 send and coming to radiofrequency signal 56 (or coming to cellular signal) by 18 receptions of UHF antenna.Diplexer 50 is connected to receive channel 58, and this channel comprises by frequency mixer and the detuner of radio frequency to intermediate frequency.Receive channel 58 is connected to comprehensive local oscillator 60, and it is provided to receive channel 58 with the modulating/demodulating signal, and this is known in the present technique field.

Receiving circuit 58 is also connected to interface special IC 62 (ASIC).Interface ASIC62 is used to realize FM frequency shift keying (FSK) receiver, FM message handling device, transmission and reception timing generator, the interface to CODEC, buffering, decay detection, FEC Code And Decode, fixed point frequency division element (speech coder), phase lock circuitry (being used to produce the CODEC clock), the input/output circuitry that mixes and gummed (glue) logical circuit that is used for processor interface.

Interface ASIC 62 is connected to transmitting channel 64, and this channel produces whereabouts radiofrequency signal 52 (whereabouts cellular signals).Transmitting channel 64 is connected to diplexer 50, provides whereabouts radiofrequency signal 52 to it, is used for launching through UHF antenna 18.Transmitting channel comprises if-to-rf frequency mixer and the modulator by transmitter.Transmitting channel 64 be connected to comprehensive basis () oscillator 60, this oscillator produces modulating/demodulating signal.The if-to-rf frequency mixer of transmitter utilizes the modulating/demodulating signal that whereabouts radiofrequency signal 52 is modulated.

Interface ASIC 62 is also connected to dsp controller 14, and dsp controller 14 is used for carrying out following function in honeycomb transmitter-receiver 16: vocoder (voice coder) analysis/synthetic, hands-free switch, digital channel demodulation/equilibrium, the transmission/reception of FM audio frequency, FM SAT detection and generation, FM FSK transmission, FM Message Processing/call treatment, digital call processing/control, user interface supervision/diagnosis/test, SACCH coding/decoding/queuing, discriminating and key generation, signaling encryption, voice recognition and ARU.Dsp controller 14 is also connected to synthetic local oscillator 60, analyze and regulate by 16 pairs of timing and frequencies of honeycomb transmitter-receiver, for example need to proofread and correct the error regularly or the error of clock rate by the modulating/demodulating signal of synthetic local oscillator 60 generations.

Dsp controller 14 also utilizes the user display that is connected thereto 20 to show the information relevant with honeycomb transmitter-receiver 16.For example user display 20 is used to show the telephone number that is pulled out by honeycomb transmitter-receiver 16, and/or shows that indication comes the signal intensity variable to the intensity of radiofrequency signal 56.

In this manner, GPS receiver 10 and honeycomb fashion transmitter-receiver 16 are combined in the cell phone housing 22, share a common dsp controller 14 and a user display 20.

The cellular phone housing, dsp controller 14 and user display 20 normally are included in two parts that cost is higher in GPS receiver 10 or the honeycomb fashion transmitter-receiver 16, by with the combination of this stream oriented device and share dsp controller 14 and 20 of user displays obtain obvious commercial interest.In addition, another advantage is by L-frequency-band antenna 12 is combined with UHF antenna 18, thereby no longer needs two antennas.This combination can comprise makes each antenna constitute single antenna, be tuned on a frequency in the middle of the frequency of the frequency of position signalling 26,28,30,32 and radiofrequency signal 52,56.Yet, antenna 12,18 is preferably in and separates on electric, shown on accompanying drawing, so that can realize optimal tuning to each antenna in the particular frequency range that receives, and mechanically connect into single mechanical part, so that reduce the complexity of installing and at utmost embody aesthetic feeling.

Though in the scope of digital cellular telephone, the preferred embodiments of the present invention are introduced, it generally includes strong DSP, dsp controller 14 in the accompanying drawings for example, it is equally applicable to the telephone system of other pattern, comprises analog cell phone, mobile satellite telephone system, person-to-person communication service (PCS) system, the relaying that comprises digital PMR private mobile radio equipment (DSMR), packet radio equipment, batch processing and specialized mobile radio system (and a lot of other both-way communication system.Mobile satellite phone system uses portable usually or the direct residential gateway portable with another via satellite or mobile unit or switched telephone of moving user unit communicates.A lot of different systems develop (for example Inmarsaf-P or ICO-Global, Iridium, Asian-Pacific mobile phone), and some, for example U.S.'s mobile-satellite company (AMSC) and Inmarsaf-M and C system come into operation.In addition, though be in the scope of GPS receiver, the preferred embodiment to be introduced, also can utilize the combination of many dissimilar radio systems, for example GLONASS or LORAN.

Though utilize certain embodiments and application thereof to disclosed the present invention by the agency of, in not breaking away from the protection scope of the present invention described in the claim, can carry out a lot of improvement and variation for those skilled in the art.

Claims (5)

1. the system ensemble of celluler radio communication and location is characterized in that comprising:

Antenna system is used for received RF signal,

Telephone receiver is connected to antenna system, is used for sending reception radiophone signal, for example terrestrial cellular telephone signal;

Positioning system receiver is connected to antenna system, is used to receive the wireless signal of positioning system, for example GPS, GLONASS, LORAN and GEOSTAR signal;

Controller according to control program work, is connected to telephone receiver, is used for the work according to control program control telephone receiver; Also be connected to positioning system receiver, be used to control the work of positioning system receiver;

Digital signal processor is connected to controller, the signal that is used to handle radiophone signal and is used to handle the positioning system wireless signal of reception and produces this system ensemble position of indication of this signal response of response;

Controller is also connected to digital signal processor, is used to receive the signal of this system ensemble position of indication and responds this signal produce position signalling, for example longitude of this system ensemble, latitude and sea level elevation; And

Display is connected to controller, is used to show information and the information relevant with radiophone signal according to position signalling.

2. according to the system of claim 1, wherein digital signal processor by using is determined algorithm from the positioning system wireless signal executing location of positioning system receiver, carries out position renewal and position correction.

3. according to the system of aforementioned any or more claims, wherein the transmission of position signalling response telephone receiver during call receives and carries out from the inquiry that remote location is transported to controller.

4. according to the system of aforementioned any or more claims, wherein telephone receiver also comprises:

Receive channel is connected to antenna system, is used for the next of radiophone signal carried out demodulation and this signal response produced next to M signal to part;

Transmitting channel is connected to this antenna, is used for the whereabouts M signal is modulated and is used to respond the whereabouts part of this signal generation radiophone signal; Wherein digital processing unit also comprises:

Be used for device to whereabouts sound signal encoding and generation whereabouts M signal;

Be used for coming to the M signal decoding and producing next device to voice signal.

5. according to the system of aforementioned any or more claims, its middle controller is connected at least one oscillator in telephone receiver and the timing and the frequency of control generator.

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