CN110196437A - Satellite signal receiving circuit and satellite signal reception method - Google Patents
Satellite signal receiving circuit and satellite signal reception method Download PDFInfo
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- CN110196437A CN110196437A CN201810162465.5A CN201810162465A CN110196437A CN 110196437 A CN110196437 A CN 110196437A CN 201810162465 A CN201810162465 A CN 201810162465A CN 110196437 A CN110196437 A CN 110196437A
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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
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
Abstract
This application discloses satellite signal receiving circuit and satellite signal reception methods.Satellite signal receiving circuit includes oscillator, two frequency mixers, two phase shifters, two low-pass filters, two phase operation circuits and bandpass filter.When the frequency of oscillator is between GLONASS system and the centre frequency of GPS/Galileo system, GLONASS and the satellite fundamental frequency signal of GPS/Galileo can be carried out by phase operation circuit phase be added with subtract each other after obtain, and Beidou satellite fundamental frequency signal can be obtained by bandpass filter.When the frequency of oscillator is between GPS/Galileo system and the centre frequency of Beidou system, Beidou and the satellite fundamental frequency signal of GPS/Galileo can be carried out by phase operation circuit phase be added with subtract each other after obtain, and GLONASS satellite fundamental frequency signal can be obtained by bandpass filter.
Description
Technical field
The present invention relates to Global Satellite Navigation System (Global Navigation Satellite System,
GNSS), especially with respect to the satellite signal receiving of Global Satellite Navigation System.
Background technique
Global Satellite Navigation System (Global Navigation Satellite System, GNSS) technology at present by
It widely applies, Fig. 1 shows frequency band used in several satellite systems (frequency band).The corresponding Soviet Union of frequency band 110
Glonass system (GLONASS) (centre frequency 1602MHz), the GALILEO positioning system of the corresponding European Union of frequency band 120
(Galileo) (centre frequency 1575.42MHz), the global positioning system (Global in the corresponding U.S. of frequency band 130
Positioning System, GPS) big-dipper satellite of the corresponding China of (centre frequency 1575.42MHz) and frequency band 140 leads
Boat system (BeiDou Navigation Satellite System, BDS) (centre frequency 1561.098MHz).In order to increase
Add the locating speed and positioning accuracy of satellite navigation receiver, there are many technologies of Literature Discussion this respect, such as the U.S.
Patent publication No. US20090124221 and US20100097966 and U.S. Patent number US7551127.U.S. Patent Publication No.
US20090124221 utilize two sets receivers and two groups of frequency synthesizers, Lai Shixian bimodulus (double band) reception (that is,
The satellite-signal of two different center frequencies is received simultaneously)；However power consumption is caused to double with two sets of reception chances simultaneously.The U.S. is special
The method that sharp publication number US20100097966 realizes dual mode reception is to share a low-noise amplifier, and close using frequency
It grows up to be a useful person, two kinds of oscillator signals is exported respectively to two-way frequency reducing RX path.U.S. Patent number US7551127 utilizes configurable
(reconfigurable) frequency eliminator realizes dual mode reception.One of the shortcomings that above-mentioned dual mode receiver, is to receive
The satellite-signal of two frequency bands is restricted the locating speed of satellite navigation receiver and positioning accuracy.
Summary of the invention
In view of the deficiency of prior art, a purpose of the present invention is that providing a kind of satellite that can receive three frequency bands simultaneously
Signal receiving circuit and satellite signal reception method, to improve the deficiency of known techniques.
The invention discloses a kind of satellite signal receiving circuits, and for receiving a satellite-signal, include: an oscillator is used to
Generate one first reference signal；One first frequency mixer, couples the oscillator, is used to first reference signal and the satellite-signal
Mixing, to generate one first mixed signal；One first phase shifter, couples the oscillator, for adjusting first reference
The phase of signal is to generate one second reference signal, and wherein first reference signal is orthogonal with second reference signal；One second
Frequency mixer couples the first phase shifter, is used to for second reference signal being mixed with the satellite-signal, to generate one second
Mixed signal；One first low-pass filter couples first frequency mixer, for being filtered to first mixed signal,
To obtain one first filtered signal；One second low-pass filter couples second frequency mixer, for this second mixing after believe
It number is filtered, to obtain one second filtered signal；One second phase shifter couples second low-pass filter, is used to
The phase of second filtered signal is adjusted to generate signal after a phase-shifted；One first phase computing circuit, couple this
One low-pass filter and the second phase shifter, for being transported to signal after first filtered signal and the phase-shifted
It calculates, to generate one first satellite fundamental frequency signal；One second phase computing circuit couples first low-pass filter and second phase
Bit Shift device is used to carry out operation to signal after first filtered signal and the phase-shifted, to generate one second satellite base
Frequency signal；And a bandpass filter, first frequency mixer and second frequency mixer are coupled, is used to first mixed signal
And second mixed signal is filtered, to obtain a third satellite fundamental frequency signal.
The present invention separately discloses a kind of satellite signal reception method comprising the steps of: (a) receives a satellite-signal；(b) it mentions
For one first reference signal；(c) it is mixed first reference signal and the satellite-signal, to obtain the phase together point of the satellite-signal
Amount；(d) one second reference signal is provided, wherein first reference signal is orthogonal with second reference signal；(e) be mixed this second
Reference signal and the satellite-signal, to obtain a quadrature component of the satellite-signal；(f) this of the low-pass filtering satellite-signal is same
This of phase component and the satellite-signal quadrature component；(g) phase is carried out to quadrature component after the low-pass filtering of the satellite-signal
Displacement, to generate quadrature component after a phase-shifted；(h) in-phase component and the phase after the low-pass filtering of the satellite-signal are calculated
The sum of quadrature component after Bit Shift, to obtain one first satellite fundamental frequency signal；(i) after the low-pass filtering for calculating the satellite-signal
The difference of quadrature component after in-phase component and the phase-shifted, to obtain one second satellite fundamental frequency signal；And (j) bandpass filtering should
The in-phase component of satellite-signal and the quadrature component of the satellite-signal, to obtain a third satellite fundamental frequency signal.
The present invention realizes that satellite is believed using a voltage controlled oscillator source (voltage-controlled oscillator, VCO)
Number three moulds (triple band) receive.Compared to known techniques, satellite signal receiving circuit of the invention and method of reseptance are not
The locating speed and positioning accuracy of satellite navigation receiver only can be improved, while reaching power saving and saving the function of circuit area
Effect.
Feature, implementation and effect for the present invention, hereby schema being cooperated to make embodiment, detailed description are as follows.
Detailed description of the invention
[Fig. 1] shows frequency band used in several satellite systems；
[Fig. 2] is the functional block diagram of an embodiment of satellite signal receiving circuit of the invention；
[Fig. 3 A~Fig. 3 B] is the flow chart of an embodiment of satellite signal reception method of the invention；And
[Fig. 4] is the functional block diagram of another embodiment of satellite signal receiving circuit of the invention.
Specific embodiment
The idiom of technical terms reference the art of following description, as this specification has part term
It is illustrated or defines, the explanation or definition of this specification are subject in the explanation of the part term.
Disclosure of the invention includes satellite signal receiving circuit and satellite signal reception method, to promote locating speed
And positioning accuracy.It may be Known Elements by satellite signal receiving circuit of the invention for the subelement for being included is independent
Part, therefore under the premise of not influencing the abundant exposure and exploitativeness of the device inventions, illustrate below for well known elements
Details will give memorandum.In addition, some or all of satellite signal reception method of the invention process can be software and/or consolidate
The form of part, and can be executed by satellite signal receiving circuit or its equivalent device of the invention, do not influencing this method
Under the premise of the abundant exposure of invention and exploitativeness, the explanation that following methods are invented will focus on step content and non-hardware.
Fig. 2 is the functional block diagram of an embodiment of satellite signal receiving circuit of the invention, and Fig. 3 A and Fig. 3 B are this hair
The flow chart of one embodiment of bright satellite signal reception method.It will illustrate below according to Fig. 2 and Fig. 3 A and Fig. 3 B of the invention
Details of operation.Satellite signal receiving circuit 200 receives satellite-signal SA (step S305) by antenna 211, followed by amplification
Device 212 (such as with low-noise amplifier (low-noise amplifier, LNA) implementation), which amplifies satellite-signal SA, becomes satellite
Signal SB (step S310).Satellite-signal SA and satellite-signal SB can be indicated respectively with equation (1) and (2):
SA=ARF1 cosωRF1 t+ARF2 cosωRF2 t+ARF3 cosωRF3 t (1)
SB=G1(ARF1 cosωRF1 t+ARF2 cosωRF2 t+ARF3 cosωRF3 t) (2)
Wherein, ωRF1、ωRF2And ωRF3Respectively frequency band 110, frequency band 120 (or frequency band 130) and frequency band (frequency
Band) 140 angular frequency, i.e. ωRF1=2 π × 1602 × 106、ωRF2=2 π × 1575.42 × 106And ωRF3=2 π ×
1561.098×106；ARF1、ARF2And ARF3The respectively amplitude of frequency band 110, frequency band 120 (or frequency band 130) and frequency band 140；G1For
The gain of amplifier 212.
Then, the first reference signal and the second reference signal are provided, the first reference signal and the second reference signal are orthogonal
(in quadrature) (step S315, S320).For example, in the present embodiment, the offer of voltage controlled oscillator 213 frequency is
fLOThe first reference signal SO (step S315), the phase of the first reference signal SO passes through quadrature phase shifter (90 ° of phase
Shifter the second reference signal SOQ (step S320)) is generated after 214 90 ° of adjustment, the first reference signal SO and second is with reference to letter
Number SOQ can be indicated respectively with equation (3) and (4):
SO=cos ωLO t (3)
SOQ=sin ωLO t (4)
Wherein ωLO=2 π/fLO.In other examples, the first reference signal SO and the second reference signal SOQ also may be used
To be provided respectively by independent voltage controlled oscillator 213, however the circuit ratio of a voltage controlled oscillator is used to use two voltage-controlled vibrations
The circuit power saving of device is swung, and can be to avoid the problem of frequency pulls (frequency pulling) between two oscillators.
Frequency fL0It can be set as between the centre frequency of frequency band 120 (or 130) and the centre frequency of frequency band 110,
Or between the centre frequency of frequency band 120 (or 130) and the centre frequency of frequency band 140.Next with the first reference signal
The frequency f of SOLOFor being set as between the centre frequency of frequency band 120 (or 130) and the centre frequency of frequency band 110 (that is,
ωRF2< ωLO< ωRF1), the present invention will be described in detail.
Then it is mixed the first reference signal SO and satellite-signal SB and low-pass filtering mixing results, after obtaining frequency reducing
Same phase (in-phase) component (step S325, S327) of satellite-signal.In detail, in the embodiment of fig. 2, satellite-signal connects
It receives circuit 200 and this two step is realized with frequency mixer 215 and low-pass filter (low-pass filter, LPF) 217.Frequency mixer
215 are mixed satellite-signal SB with the first reference signal SO, and obtain mixed signal SC, then 217 low pass of low-pass filter
It filters mixed signal SC and obtains filtered signal SD.Mixed signal SC and filtered signal SD can be respectively with equation
(5) and (6) indicate:
By equation (5) and (6) it is found that mixed signal SC is after low-pass filtering, radio-frequency component (cos (ωLO+
ωRF1)t、cos(ωLO+ωRF2) t and cos (ωLO+ωRF3) t) with higher-frequency ingredient (cos (ωLO+ωRF3) t) be all filtered out.
Similar step S325 and S327, the second reference signal SOQ is with satellite-signal SB and low-pass filtering is mixed knot for mixing
Fruit, to obtain orthogonal (quadrature) component (step S330, S332) of the satellite-signal after frequency reducing.In detail, Fig. 2's
In embodiment, satellite signal receiving circuit 200 realizes this two step with frequency mixer 216 and low-pass filter 218.Frequency mixer 216
Satellite-signal SB is mixed with the second reference signal SOQ, and obtains mixed signal SG, then 218 low pass filtered of low-pass filter
Signal SG after wave mixing and obtain filtered signal SH.Mixed signal SG and filtered signal SH can be respectively with equation
(7) and (8) indicate:
Next, the in-phase component and quadrature component (step S335) of amplification satellite-signal.In detail, in the implementation of Fig. 2
In example, filtered signal SD is amplified device (amplifier) 219 (such as with programmable gain amplifier (programmable
Gain amplifier, PGA) implementation, there is gain G2) become enlarged filtered signal SE, filtered signal after amplification
SH is amplified device 220 (such as with programmable gain amplifier implementation, with gain G2) become enlarged filtering after amplification after
Signal SI.Enlarged filtered signal SE and enlarged filtered signal SI can be respectively with equation (9) and (10) table
Show:
Next phase-shifted is carried out to the quadrature component of satellite-signal, to generate quadrature component (step after phase-shifted
S340).In detail, 221 couples of enlarged filtered signal SI of intermediate frequency quadrature phase shifter (IF90 ° of phase shifter)
(such as phase of substantially 90 ° of displacement) obtains signal SJ after phase-shifted, signal SJ after phase-shifted after progress phase-shifted
It can be indicated with equation (11):
Then, calculate satellite-signal in-phase component and phase-shifted after the sum of quadrature component, to obtain the first satellite base
Frequency signal (step S345).In detail, because of fLOIt is set as in the centre frequency of frequency band 120 (or 130) and frequency band 110
Between frequency of heart, so the satellite that the satellite-signal of GALILEO positioning system (or global positioning system) is glonass system is believed
Number image signal.Phase operation circuit 222 (such as with phase adder (phase combiner) implementation) will be enlarged
Filtered signal SE obtains satellite fundamental frequency signal SF after being added with signal SJ after phase-shifted, satellite fundamental frequency signal SF can be with side
Formula (12) indicates:
SF=SE+SJ
=G1·G2·ARF1 cos(ωRF1-ωLO)t
=G1·G2·ARF1 cosωIF1 t (12)
Wherein ωIF1=ωRF1-ωLO。
Similarly, the in-phase component of satellite-signal and the difference of quadrature component after phase-shifted are calculated, to obtain the second satellite
Fundamental frequency signal (step S350).In detail, because of fLOIt is set as the centre frequency and frequency band 110 between frequency band 120 (or 130)
Between centre frequency, so the satellite-signal of glonass system is also defending for GALILEO positioning system (or global positioning system)
The image signal of star signal.Phase operation circuit 223 (such as with phase adder implementation) is by enlarged filtered signal SE
Satellite fundamental frequency signal SK is obtained after subtracting each other with signal SJ after phase-shifted, satellite fundamental frequency signal SK can be with equation (13) table
Show:
SK=SE-SJ
=G1·G2·ARF2 cos(ωLO-ωRF2)t
=G1·G2·ARF2 cosωIF2 t (13)
Wherein ωIF2=ωLO-ωRF2。
Next, the in-phase component and quadrature component of bandpass filtering satellite-signal, to obtain another satellite fundamental frequency signal (step
Rapid S355).In detail, in this step, the same phase of bandpass filter (bandpass filter, BPF) 226 pairs of satellite-signals
Component (that is, mixed signal SC) and quadrature component (that is, mixed signal SG) carry out bandpass filtering (that is, filter out high frequency at
Divide (cos (ωLO+ωRF1)t、cos(ωLO+ωRF2) t and cos (ωLO+ωRF3) t) and low-frequency component (cos (ωLO-ωRF1) t with
cos(ωLO-ωRF2) t), and obtain satellite fundamental frequency signal SL (also that is, signal) after bandpass filtering.Satellite fundamental frequency signal SL's
In-phase component (SL_I) and quadrature component (SL_Q) can be indicated respectively with equation (14) and (15):
Then, satellite fundamental frequency signal SL can be indicated with equation (16):
SL=SL_I+SL_Q
=G1·ARF3 cos(ωLO-ωRF3)t
=G1·ARF3 cosωIF3 t (16)
Wherein ωIF3=ωLO-ωRF3.Bandpass filter 226 for example can be with image-reject filter (image
Rejection bandpass filter) implementation.Satellite fundamental frequency signal SL is through amplifier 227 (such as with programmable automation controller
Device implementation has gain G2) after amplification (step S360) become amplified satellite fundamental frequency signal SM, amplified satellite fundamental frequency
Signal SM can be indicated with equation (17):
SM=G1·G2·ARF3 cosωIF3 t (17)
Then with analog-digital converter (analog-to-digital converter, ADC) 224, ADC225 and ADC
228 respectively convert satellite fundamental frequency signal SF, satellite fundamental frequency signal SK and amplified satellite fundamental frequency signal SM to numeric field (step
Rapid S365).In the digital domain, digital signal processor (digital signal processor, DSP) 229 is with coding gain
(coding gain) amplifies three satellite fundamental frequency signals (step S370) again, is then generated according to three satellite fundamental frequency signals
Location information.
In conclusion as the frequency f the first reference signal SOLOIt is set as the centre frequency between frequency band 120 (or 130)
Between the centre frequency of frequency band 110 (that is, ωRF2< ωLO< ωRF1) when, satellite fundamental frequency signal SF corresponds to glonass system
Satellite-signal, satellite fundamental frequency signal SK corresponds to the satellite-signal of GALILEO positioning system or global positioning system, and satellite base
Frequency signal SL and amplified satellite fundamental frequency signal SM corresponds to the satellite-signal of Beidou satellite system.In a preferred embodiment
In, work as fLOIt is set asfLOThe substantial minimum frequency and frequency band of frequency band 120 (or 130) can be equal to
The half of the summation of 110 substantial maximum frequency.By taking frequency band 120 as an example,
In other examples, as the frequency f the first reference signal SOLOIt is set as between frequency band 120 (or 130)
Between centre frequency and the centre frequency of frequency band 140 (that is, ωRF3< ωLO< ωRF2) when, GALILEO positioning system (or the whole world
Positioning system) satellite-signal and Beidou satellite navigation system satellite-signal other side each other image signal, satellite base at this time
Frequency signal SF corresponds to the satellite-signal of GALILEO positioning system or global positioning system, and satellite fundamental frequency signal SK corresponds to big-dipper satellite
The satellite-signal of system, and satellite fundamental frequency signal SL and amplified satellite fundamental frequency signal SM correspond to the satellite of glonass system
Signal.In a preferred embodiment, work as fLOIt is set asfLOCan be equal to frequency band 120 (or
130) half of the summation of the substantial minimum frequency of substantial maximum frequency and frequency band 140.By taking frequency band 120 as an example,
In the embodiment shown in Fig. 3 A and Fig. 3 B, exchanging certain steps not influences implementation of the invention.For example, may be used
Step S327 is executed again to first carry out step S330；Step S355 can be executed earlier than S345 and S350.In different embodiments
In, step S340, S345 and S350 of Fig. 3 B can also be executed in numeric field, that is to say, that step S340, S345 and S350 be also
It can be executed after step S365, corresponding circuit diagram is as shown in Figure 4.Satellite signal receiving circuit 400 is with intermediate frequency quadrature
Phase shifter 421, phase operation circuit 422 and phase operation circuit 423 numeric field execute step S340, S345 and
S350.In certain embodiments, intermediate frequency quadrature phase shifter 421, phase operation circuit 422 and phase operation circuit 423
Function also can be by 429 implementation of digital signal processor, that is, step S340, S345 and S350 are by digital signal processor 429
Corresponding mould group executes.Those mould groups can be by hardware (such as circuit) implementation, or the control by digital signal processor 429
Circuit (such as microcontroller, microprocessor etc.) processed executes the mode implementation of program code or program instruction.
In conclusion the present invention realizes that three moulds (triple band) of satellite-signal receive, that is, satellite letter of the invention
The satellite-signal of three different center frequencies can be received simultaneously by number receiving circuit and satellite signal reception method.The above embodiments
Though the present invention is equally applicable for other systems by taking Global Satellite Navigation System as an example.
Due to the art, tool usually intellectual can understand this by the disclosure of the device inventions of the application
The implementation detail and variation of the method invention of application, therefore, to avoid superfluous text, in the exposure requirement for not influencing this method invention and
Under the premise of exploitativeness, repeated explanation gives memorandum herein.It is taken off in diagram before note that, shape, size, the ratio of element
And sequence of step etc. is only to illustrate, and understands the present invention for the art tool usually intellectual and is used, it is non-to limit
The present invention.
Although embodiments of the present invention are as described above, however those embodiments not are used to limit the present invention, this technology neck
The domain tool usually intellectual content that can express or imply according to the present invention imposes variation to technical characteristic of the invention, it is all this
Many variations may belong to patent protection scope sought by the present invention, and in other words, scope of patent protection of the invention must regard
Subject to the protection scope institute defender of this specification.
Symbol description
110,120,130,140 frequency band
200,400 satellite signal receiving circuit
211 antennas
212,219,220,227 amplifier
213 voltage controlled oscillators
214 quadrature phase shifters
215,216 frequency mixer
217,218 low-pass filter
221,421 intermediate frequency quadrature phase shifter
222,223,422,423 phase operation circuit
224、225、228 ADC
226 bandpass filters
229,429 digital signal processor
The first reference signal of SO
The second reference signal of SOQ
SA, SB satellite-signal
SC, SG mixed signal
SD, SH filtered signal
The enlarged filtered signal of SE, SI
SF, SK, SL satellite fundamental frequency signal
Signal after SJ phase-shifted
The amplified satellite fundamental frequency signal of SM
S305~S370 step
Claims (10)
1. a kind of satellite signal receiving circuit includes for one satellite-signal of reception:
One oscillator, for generating one first reference signal；
One first frequency mixer, couples the oscillator, is used to for first reference signal being mixed with the satellite-signal, with generation one the
One mixed signal；
One first phase shifter, couples the oscillator, for adjusting the phase of first reference signal to generate one second ginseng
Signal is examined, wherein first reference signal is orthogonal with second reference signal；
One second frequency mixer couples the first phase shifter, is used to for second reference signal being mixed with the satellite-signal, with
Generate one second mixed signal；
One first low-pass filter couples first frequency mixer, for being filtered to first mixed signal, to obtain one
First filtered signal；
One second low-pass filter couples second frequency mixer, for being filtered to second mixed signal, to obtain one
Second filtered signal；
One second phase shifter couples second low-pass filter, for adjusting the phase of second filtered signal to produce
Signal after a raw phase-shifted；
One first phase computing circuit couples first low-pass filter and the second phase shifter, is used to first filter
Signal carries out operation after signal and the phase-shifted after wave, to generate one first satellite fundamental frequency signal；
One second phase computing circuit couples first low-pass filter and the second phase shifter, is used to first filter
Signal carries out operation after signal and the phase-shifted after wave, to generate one second satellite fundamental frequency signal；And
One bandpass filter couples first frequency mixer and second frequency mixer, be used to first mixed signal and this
Two mixed signals are filtered, to obtain a third satellite fundamental frequency signal.
2. satellite signal receiving circuit as described in claim 1, also includes:
One first analog-digital converter couples the first phase computing circuit, is used to convert the first satellite fundamental frequency signal
To numeric field；
One second analog-digital converter couples the second phase computing circuit, is used to convert the second satellite fundamental frequency signal
To numeric field；
One third analog-digital converter, couples the bandpass filter, for converting the third satellite fundamental frequency signal to number
Domain；And
One digital signal processor couples first analog-digital converter, second analog-digital converter and the third mould
Quasi- digital quantizer, amplifies the first satellite fundamental frequency signal, the second satellite fundamental frequency signal and the third with a coding gain and defends
Star fundamental frequency signal.
3. satellite signal receiving circuit as described in claim 1, also includes:
One first analog-digital converter is coupled between first low-pass filter and the first phase computing circuit, is used to
First filtered signal is converted to numeric field；
One second analog-digital converter is coupled between second low-pass filter and the second phase shifter, and being used to will
Second filtered signal is converted to numeric field；
One third analog-digital converter, couples the bandpass filter, for converting the third satellite fundamental frequency signal to number
Domain；And
One digital signal processor couples the first phase computing circuit, the second phase computing circuit and third simulation number
Word converter amplifies the first satellite fundamental frequency signal, the second satellite fundamental frequency signal and the third satellite base with a coding gain
Frequency signal；
Wherein, the second phase shifter, the first phase computing circuit and the second phase computing circuit are completed in numeric field
Operation.
4. satellite signal receiving circuit as described in claim 1, wherein the first satellite fundamental frequency signal corresponds to GLONASS
(GLONASS) satellite system, the second satellite fundamental frequency signal correspond to global positioning system (GPS) or GALILEO positioning system
(GaLileo), which corresponds to Beidou (Beidou) satellite system, and the frequency of first reference signal is situated between
Between 1575.42MHz and 1602MHz.
5. satellite signal receiving circuit as claimed in claim 4, wherein the frequency of first reference signal is equal to global location
The half of the summation of the highest frequency of system or the low-limit frequency of GALILEO positioning system and GLONASS satellite system.
6. satellite signal receiving circuit as described in claim 1, wherein the first satellite fundamental frequency signal corresponds to global positioning system
System (GPS) or GALILEO positioning system (GaLileo), the second satellite fundamental frequency signal correspond to Beidou (Beidou) satellite system,
The third satellite fundamental frequency signal corresponds to GLONASS (GLONASS) satellite system, and the frequency of first reference signal between
Between 1575.42MHz and 1561.098MHz.
7. satellite signal receiving circuit as claimed in claim 6, wherein the frequency of first reference signal is equal to global location
The half of the summation of the low-limit frequency of the highest frequency and Beidou satellite system of system or GALILEO positioning system.
8. a kind of satellite signal reception method, includes:
(a) satellite-signal is received；
(b) one first reference signal is provided；
(c) it is mixed first reference signal and the satellite-signal, to obtain an in-phase component of the satellite-signal；
(d) one second reference signal is provided, wherein first reference signal is orthogonal with second reference signal；
(e) it is mixed second reference signal and the satellite-signal, to obtain a quadrature component of the satellite-signal；
(f) in-phase component of the low-pass filtering satellite-signal and the quadrature component of the satellite-signal；
(g) phase-shifted is carried out to quadrature component after the low-pass filtering of the satellite-signal, to generate after a phase-shifted orthogonal point
Amount；
(h) the sum of quadrature component after in-phase component and the phase-shifted is calculated after the low-pass filtering of the satellite-signal, to obtain one
First satellite fundamental frequency signal；
(i) difference of quadrature component after in-phase component and the phase-shifted after the low-pass filtering of the satellite-signal is calculated, to obtain
One second satellite fundamental frequency signal；And
(j) in-phase component of the bandpass filtering satellite-signal and the quadrature component of the satellite-signal, are defended with obtaining a third
Star fundamental frequency signal.
9. the satellite signal reception method as described in claim 8, also includes:
(k) the first satellite fundamental frequency signal, the second satellite fundamental frequency signal and the third satellite fundamental frequency signal are converted to number
Domain；And
(l) the first satellite fundamental frequency signal, the second satellite fundamental frequency signal and the third satellite fundamental frequency are amplified with a coding gain
Signal.
10. the satellite signal reception method as described in claim 8, also includes:
(k) in-phase component after the low-pass filtering of the satellite-signal is converted to numeric field；
(l) quadrature component after the low-pass filtering of the satellite-signal is converted to numeric field；
(m) the third satellite fundamental frequency signal is converted to numeric field；And
(n) the first satellite fundamental frequency signal, the second satellite fundamental frequency signal and the third satellite fundamental frequency are amplified with a coding gain
Signal；
Wherein, step (k) and step (l) are executed earlier than step (g), step (h) and step (i).
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| Publication number | Priority date | Publication date | Assignee | Title |
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