CN102520424A - Low intermediate frequency double-frequency dual mode GNSS receiver radio frequency front-end apparatus - Google Patents
Low intermediate frequency double-frequency dual mode GNSS receiver radio frequency front-end apparatus Download PDFInfo
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Abstract
The invention discloses a low intermediate frequency double-frequency dual mode GNSS receiver radio frequency front-end apparatus comprising a low noise amplification module, a one-time down-conversion mixer module, a frequency synthesis module, an I/Q active fully differential band pass filter module, an analog-to-digital conversion module, and a control module, wherein the low noise amplification module includes a low noise amplifier, two surface acoustic wave filters and a radio frequency switch as well as the one-time down-conversion mixer module includes an automatic gain amplifier and a fixed gain amplifier. Advantages of the apparatus are as follows: the radio frequency switch is used to switch two paths of useful radio frequency signals of a GPSL1/GALILEOE2-L1-E1waveband signal and a GPSL5/GALTLEOE5a waveband signal; and the one-time down-conversion mixer containing the automatic gain amplifier and the fixed gain amplifier, a frequency synthesizer, and an intermediate frequency filer are shared; therefore, maximization reusing of receiver hardware is realized; cost and power consumption of the whole receiver are reduced; alternative receiving and demodulation of the GPSL1/GALILEOE2-L1-E1waveband signal and the GPSL5/GALTLEOE5a waveband signal are realized.
Description
Technical field
The present invention relates to a kind of radio frequency front-end device, especially relate to a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device.
Background technology
With GPS is that representative GPS (GNSS) has been widely used in every field such as civil aviaton, navigation, railway, logistics.
The application of novel bimodulus dual-frequency receiver makes receiver can utilize the navigation signal correction ionosphere and the tropospheric time-delay of two different frequencies, and the information of comprehensive a plurality of navigational system, further improves the precision of navigator fix.Emission GPS IIF satellite has identical centre frequency with the E5a frequency range of Galileo system new people of L5 frequency range introducing with signal just at present.The GPS III satellite of following emission also will produce a signal compatible with GALILEO E2-L1-E1 frequency range.The Distribution Pattern of navigation satellite signal and the wide application prospect of multi-frequency multi-mode navigation neceiver look to the future.The present invention proposes the Low Medium Frequency DBDM GNSS receiver radio frequency fore device of a kind of GPS of being operated in L1/GALILEO E2-L1-E1 band signal and GPS L5/GALILEO E5a band signal.
Summary of the invention
The present invention solves the existing in prior technology technical matters; A kind of reception that has realized the radiofrequency signal of GPS L1/GALILEO E2-L1-E1 band signal and GPS L5/GALILEO E5a is provided, and the shared single-conversion frequency mixer of two paths of signals, frequency synthesizer and intermediate frequency amplification module have been realized at utmost shared a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device of module in the device.
It is the technical matters that solves existing in prior technology etc. that the present invention has a purpose again; Provide a kind of.
Above-mentioned technical matters of the present invention mainly is able to solve through following technical proposals:
A kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device; It is characterized in that; The frequency synthesis module that comprises control module and be connected with control module respectively, analog-to-digital conversion module and low noise amplification module; The same down-conversion mixer module of said low noise amplification module is connected with I, the active fully differential BPF. of Q module; Said frequency synthesis module also is connected with a down-conversion mixer module, and said analog-to-digital conversion module also is connected with I, the active fully differential BPF. of Q module.
The present invention is achieved in that GPS L1/GALILEO E2-L1-E1 band signal and GPS L5/GALILEO E5a band signal; Amplify through the two-way low noise amplifier respectively, the signal after the amplification is through undesired signal in the said SAW filter filtering environmental.Two paths of signals after the amplification filtering is connected with back level module through said RF switch.The local oscillation signal mixing that the signal that is communicated with by said RF switch produces with said frequency synthesizer in described single-conversion frequency mixer is down-converted to required intermediate frequency I, Q two paths of signals.Intermediate frequency I after the down coversion, Q two paths of signals amplify through variable gain amplifier and the fixed gain amplifier that described single-conversion frequency mixer comprises.Said amplifier's gain by said gain control circuit according to the amplified signal amplitude adjusted.The mirror image of intermediate frequency I, Q two-way suppresses to be accomplished by single-conversion frequency mixer self.Intermediate frequency I after the amplification, Q two paths of signals carry out filtering through said I, the active fully differential BPF. of Q earlier.Filtered intermediate frequency I, Q two paths of signals are converted into 8 required digital intermediate frequency signals through said analog to digital converter at last.
At above-mentioned a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device; Adopt single-conversion Low Medium Frequency structure, the L1 band signal L5 band signal of timesharing reception and demodulation gps system and the E2-L1-E1 band signal and the E5a band signal of GALILEO system.
At above-mentioned a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device, it is characterized in that the centre frequency of four tunnel band signal is respectively: GPS L1/GALILEO E2-L1-E1 is 1575.42MHZ, and GPS L5/GALILEO E5a is 1176.45MHZ; The local oscillation signal frequency of described frequency synthesizer is: 1571.328MHZ and 1171.335MHZ; The bandwidth of described BPF. is: 8MHZ; Described SAW filter is: 1575.42MHZ and 1176.45MHZ.
A kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device above-mentioned is characterized in that described low noise amplification module comprises two-way low noise amplifier, two SAW filters and a RF switch; A said down-conversion mixer module comprises automatic gain amplifier and fixed gain amplifier.
At above-mentioned a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device; It is characterized in that; Described GPS L1/GALILEO E2-L1-E1 band signal and GPS L5/GALILEO E5a band signal; Amplify through the two-way low noise amplifier respectively, the signal after the amplification is through linking to each other with RF switch after the undesired signal in the said SAW filter filtering environmental.Three ports of RF switch link to each other with frequency mixer with the low noise amplifier of two paths of signals respectively.The switching of two radio-frequency channels adopts RF switch to realize.
A kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device above-mentioned is characterized in that, the local oscillation signal frequency that the frequency synthesis module produces is controlled through serial line interface by control module.Can realize the output of 1571.328MHZ and two frequencies of 1171.335MHZ.
At above-mentioned a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device; It is characterized in that; Local oscillation signal through the signal after the described low noise amplification module selection amplification produces with said frequency synthesizer in a described down-conversion mixer is realized a down coversion mixing, and down coversion obtains two-way I, Q two-way analog baseband signal.Intermediate frequency I after the down coversion, Q two-way analog baseband signal amplify through variable gain amplifier and the fixed gain amplifier that described single-conversion frequency mixer comprises.Said amplifier's gain by said gain control circuit according to the amplified signal amplitude adjusted.The mirror image of intermediate frequency I, Q two-way suppresses to be accomplished by a down-conversion mixer self.
A kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device above-mentioned is characterized in that, the intermediate frequency I after the amplification, Q two paths of signals carry out bandpass filtering through said I, the active fully differential BPF. of Q earlier.
A kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device above-mentioned is characterized in that filtered intermediate frequency I, Q two paths of signals are converted into 8 required digital intermediate frequency signals through said analog to digital converter at last.
At above-mentioned a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device; It is characterized in that; When wherein a tunnel when being connected of two channels of needs; Described control module is controlled the local oscillation signal that described frequency synthesizer produces corresponding frequencies through serial line interface, and the output mode of described analog to digital converter and data layout also through control module control, switch to corresponding channel through said RF switch at last.
Therefore; The present invention has following advantage: realized the reception to the radiofrequency signal of GPS L1/GALILEO E2-L1-E1 band signal and GPS L5/GALILEO E5a, and the shared single-conversion frequency mixer of two paths of signals, frequency synthesizer and intermediate frequency amplification module have been realized the at utmost shared of module in the device.
Description of drawings
Fig. 1 is a Low Medium Frequency DBDM GNSS receiver radio frequency front-end architecture block diagram of the present invention.
Fig. 2 is the circuit theory diagrams of low noise amplification module of the present invention.
Fig. 3 is the circuit theory diagrams of a down-conversion mixer module of the present invention.
Fig. 4 is the circuit theory diagrams of frequency synthesis module of the present invention.
Fig. 5 is the circuit theory diagrams of I of the present invention, the active fully differential bandpass filtering modules block of Q.
Fig. 6 is the circuit theory diagrams of analog-to-digital conversion module of the present invention.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment:
A kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device; It is characterized in that; The frequency synthesis module that comprises control module and be connected with control module respectively, analog-to-digital conversion module and low noise amplification module; The same down-conversion mixer module of said low noise amplification module is connected with I, the active fully differential BPF. of Q module; Said frequency synthesis module also is connected with a down-conversion mixer module, and said analog-to-digital conversion module also is connected with I, the active fully differential BPF. of Q module.
As shown in Figure 1, system chart of the present invention is following: GNSS channel antenna at first links to each other with the low noise amplification module.By the LNA module amplify and select after signal further get into the local oscillation signal mixing of down-conversion mixer module and the generation of frequency synthesis module again, make signal be down-converted to required Low Medium Frequency simulating signal.In a down-conversion mixer module, comprise a variable gain amplifier and fixed gain amplifier, they make signal be amplified to a suitable amplitude.Signal after the amplification passes through I, Q fully differential active band-pass filter module filtering channel external noise again.Get into analog-to-digital conversion module through filtered signal, convert baseband decoding needed number signal into.The control module of complete machine is made up of single-chip microcomputer, mainly is responsible for radio-frequency channel, the switching controls of local frequency and the control of analog-to-digital conversion module output.
Fig. 2 is the circuit theory diagrams of the low noise amplification module among Fig. 1.RF1 among Fig. 2 and RF2 are respectively the SMA input port of GPS L1/GALILEO E2-L1-E1 and GPS L5/GALILEO E5a band signal, and LNAO is the delivery outlet through RF switch strobe channel path LNA.U1 and U3 are the BGA430 chip of Infineon Technologies company.This chip is a wide band high-gain LNA chip, and under the 5V electric power thus supplied, this chip can reach more than the 28dB in the gain of navigation frequency range, and noise figure is below 2.4dB.C46, C48, C51, C53 are the input and output matching capacitance of LNA.U2 and U4 are the SAW filter that centre frequency is respectively 1575.42MHz and 1176.45MHz, are used for the undesired signal of filtering environmental.C47, C52 are the output matching capacitance of matched filter.SW1 is the high-speed radio-frequency switch.Can realize the switching of two channels through SELECT level among Fig. 2 is set, thereby realize the alternately reception and the demodulation of GPS L1/GALILEO E2-L1-E1 signal and GPS L5/GALILEO E5a signal.
Fig. 3 is a down-conversion mixer schematic diagram among Fig. 1.U5 is the AD8347 chip of ANALOG DEVICES company among Fig. 3.This chip comprises a quadrature demodulation module, variable gain amplifier and automatic gain control circuit and a fixed gain amplifier; Input third order intermodulation point under least gain is 11.5dBm, and the noise figure under the maximum gain is 11dB.The LNAIN port is the chip RF signal input end among Fig. 3, and the PLLIN port is a chip local oscillation signal input end, and IN and IP port are the output terminal of I road differential signal, and QN and QP port are the output terminal of Q road differential signal.R40, C89, C90 form the radio-frequency input signals match circuit, and R38, C67, C68 form local oscillation circuit input signal match circuit.U6 is Ba Lun among Fig. 3, and being used to change local oscillation signal is differential signal.Radiofrequency signal is being amplified by two variable gain amplifiers respectively with local oscillation signal mixing front and back, and this amplifier's gain is controlled by an automatic gain control circuit.Mixing and the two-way I, the Q signal that produce through variable gain amplifier amplification back by 8 pins and the output of 22 pins of U5 chip, amplify the intermediate-freuqncy signal that the amplitude that obtains is suitable through an interior fixed gain amplifier of U5 chip respectively again.
Fig. 4 is the circuit theory diagrams of local oscillator module among Fig. 1.U7 among the figure is the Si4133 chip of SILICON LABS company.This chip comprises two radio-frequency channels and an intermediate-frequency channel.Wherein the centre frequency scope of two radio-frequency channels is respectively: RF1 passage 947-1720MHz, RF2 passage 789-1429MHz; The centre frequency explicit value is respectively by the inductance size decision that is connected between U13 chip 4,5 pins and 7,8 pins.For local oscillation signal required for the present invention, can calculate, 7,8 pin inductance that are used to control the RF1 passage are 0.368nH, be used to control the RF2 passage 4,5 between inductance value 1.54nH.1.54nH inductance can utilize PCB cabling inductance to realize that the 0.368nH inductance also can directly replace with the PCB cabling.Two shared delivery outlets in radio-frequency channel in the chip are that the pin of SDA among Fig. 4, CLK, CS is specified the gating passage by single-chip microcomputer through serial line interface.U8 is a temperature compensating crystal oscillator, and can produce frequency is the 16.368MHz oscillator signal, as the reference frequency of phaselocked loop.The PLLO port is the radio frequency delivery outlet of chip among the figure, the local oscillation signal that output produces.Under the prerequisite of the inductance that connects suitable size; The reference frequency dividing ratio that serial line interface configuration through chip is correct just can make two radio-frequency channels two frequencies of generation of chip be respectively the local oscillation signal of 1571.328MHz and 1171.335MHz with the VCO frequency dividing ratio, is used for the demodulation of GPS L1/GALILEO E2-L1-E1 signal and GPS L5/GALILEO E5a.
Fig. 5 is the I among Fig. 1, the circuit theory diagrams of Q fully differential active band-pass filter module.W1 among Fig. 5, W2, W3, W4 are the AD8132 of ANALOG DEVICES company.3 dB bandwidth of this chip are 350 MHz, and differential signal input and output are provided, and can single supply (+5V) power supply.QN, QP, IN, IP are respectively Q road and I road differential intermediate frequency input port.VQ+, VQ-, VI+, VI-are respectively Q road and I road differential intermediate frequency output port.The Q road active bandpass filtering modules block of fully differential is to adopt W1, W2 and capacitor C 18-C19, C21-C22, C24, C26, C28-C29, the second order fully differential Active RC BPF. that resistance R 20-R23 forms together.Voltage on the VCOM pin of W1, W2 is by R20, and the R21 dividing potential drop obtains.Ratio through synchronous adjustment C18/C26, C19/C24 can be adjusted the gain of Q road second order fully differential Active RC BPF..Through the value of synchronous adjustment C21-C22, C28-C29, R20-R23, can adjust the centre frequency of Q road second order fully differential Active RC BPF..The I road active bandpass filtering modules block of fully differential is the second order fully differential Active RC BPF. that adopts W3, W4 and capacitor C 32-C33, C35-C36, C39-C40, C42-C43 and resistance R 24-R27 to form.Voltage on the VCOM pin of W3, W4 is obtained by the R28-R29 dividing potential drop.Ratio through synchronous adjustment C32/C29, C33/C40 can be adjusted the gain of second order fully differential Active RC BPF..Through the value of synchronous adjustment C35-C36, C42-C43, R24-R27, can adjust the centre frequency of I road second order fully differential Active RC BPF..Through test, the centre frequency of second order fully differential active band-pass filter module is about 4M, and 3 dB bandwidth are about 8M, the outer inhibition degree of band is-30dB about.
Fig. 6 is the circuit theory diagrams of analog-to-digital conversion module.U9 is that the AD9288.AD9288 of ANALOG DEVICES is 8 single-chip samplings of a binary channels analog to digital converter among Fig. 6; Built-in interior sampling hold circuit; Coding is input as the TTL/CMOS compatibility; 8 bit digital are output as the TTL/CMOS compatibility, and independent out-put supply pin is supported 3.3 V or 2.5 V logic interfacings.Have low cost, low-power consumption, advantage such as size is little and ease for use is good.VI+ in the circuit, VI-, VQ+, VQ-are the input end of analog signal mouth of AD9288.DI0-DI7, DQ0-DQ7 are the digital signal output end mouth of AD9288.DFS, S1, S2 are the data output format of AD9288, the control port of pattern.VI+, VI-signal be input to respectively the AINA, AINA of U9B negative in, the digital signal after the analog to digital conversion is exported from DI0-DI7 respectively.During the VQ+ of input, the AINB that the VQ-signal is input to U9B respectively, AINB bore, the digital signal after the analog to digital conversion was exported from DQ0-DQ7 respectively.The reference voltage of U9 produces by U9 is inner, by receiving accurate Voltage Reference input end 5 pin of A roadbed respectively, accurate Voltage Reference input end 7 pin of B roadbed after the output of 6 pin.Reference voltage carries out filtering through C1-C3, the filtering high frequency interference.Adopt C4-C7 to carry out filtering, the filtering high frequency interference to U9 numerical portion power supply.Adopt C11-C13 to carry out filtering, the filtering high frequency interference to U9 analog part power supply.The needed sampling clock of U9 carries clock circuit by plate and produces.It is to produce digital square wave by the active crystal oscillator of U10 that plate carries clock circuit, produces CLKA, CLKB behind digital square wave process U11, the U12 NOR gate circuit.CLKA is input to sampling clock output terminal 47 pin of the A channel of U9, and CLKB is input to sampling clock output terminal 14 pin of the B passage of U9.4 pin of U9 are the control voltage on the output data form base pin selection DFS. pin DFS when being high, and the digital signal of U9 output is complementary scale-of-two, otherwise is offset binary.8,9 pin of U9 are mode of operation base pin selection S1, S2.S1, the last Different control combination of voltages of S2 can be operated in closed condition by U9, the A channel state that works independently, A, B passage synchronous working state, A, in the B passage asynchronous working state one.Concrete control is accomplished by control module.S receiver radio frequency fore device is characterized in that, described low noise amplification module comprises two-way low noise amplifier, two SAW filters and a RF switch; A said down-conversion mixer module comprises automatic gain amplifier and fixed gain amplifier.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (10)
1. Low Medium Frequency DBDM GNSS receiver radio frequency fore device; It is characterized in that; The frequency synthesis module that comprises control module and be connected with control module respectively, analog-to-digital conversion module and low noise amplification module; The same down-conversion mixer module of said low noise amplification module is connected with I, the active fully differential BPF. of Q module; Said frequency synthesis module also is connected with a down-conversion mixer module, and said analog-to-digital conversion module also is connected with I, the active fully differential BPF. of Q module.
2. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 1; It is characterized in that; Adopt single-conversion Low Medium Frequency structure, the L1 band signal L5 band signal of timesharing reception and demodulation gps system and the E2-L1-E1 band signal and the E5a band signal of GALILEO system.
3. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 2; It is characterized in that; The centre frequency of four tunnel band signal is respectively: GPS L1/GALILEO E2-L1-E1 is 1575.42MHZ, and GPS L5/GALILEO E5a is 1176.45MHZ; The local oscillation signal frequency of described frequency synthesizer is: 1571.328MHZ and 1171.335MHZ; The bandwidth of described BPF. is: 8MHZ; Described SAW filter is: 1575.42MHZ and 1176.45MHZ.
4. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 3 is characterized in that described low noise amplification module comprises two-way low noise amplifier, two SAW filters and a RF switch; A said down-conversion mixer module comprises automatic gain amplifier and fixed gain amplifier.
5. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 4; It is characterized in that; Described GPS L1/GALILEO E2-L1-E1 band signal and GPS L5/GALILEO E5a band signal; Amplify through the two-way low noise amplifier respectively; Signal after the amplification is through linking to each other with RF switch after the undesired signal in the said SAW filter filtering environmental, and three ports of RF switch link to each other with frequency mixer with the low noise amplifier of two paths of signals respectively, and the switching of two radio-frequency channels adopts RF switch to realize.
6. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 5; It is characterized in that; The local oscillation signal frequency that the frequency synthesis module produces through serial line interface control, can realize the output of 1571.328MHZ and two frequencies of 1171.335MHZ by control module.
7. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 6; It is characterized in that; Local oscillation signal through the signal after the described low noise amplification module selection amplification produces with said frequency synthesizer in a described down-conversion mixer is realized a down coversion mixing; Down coversion obtains two-way I, Q two-way analog baseband signal; Intermediate frequency I after the down coversion, Q two-way analog baseband signal amplify through variable gain amplifier and the fixed gain amplifier that described single-conversion frequency mixer comprises; According to the amplified signal amplitude adjusted, the mirror image of intermediate frequency I, Q two-way suppresses to be accomplished by a down-conversion mixer self said amplifier's gain by said gain control circuit.
8. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 7 is characterized in that, the intermediate frequency I after the amplification, Q two paths of signals carry out bandpass filtering through said I, the active fully differential BPF. of Q earlier.
9. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 8 is characterized in that filtered intermediate frequency I, Q two paths of signals are converted into 8 required digital intermediate frequency signals through said analog to digital converter at last.
10. a kind of Low Medium Frequency DBDM GNSS receiver radio frequency fore device according to claim 9; It is characterized in that; When wherein a tunnel when being connected of two channels of needs; Described control module is controlled the local oscillation signal that described frequency synthesizer produces corresponding frequencies through serial line interface, and the output mode of described analog to digital converter and data layout also through control module control, switch to corresponding channel through said RF switch at last.
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Application publication date: 20120627 |