CN110196437B - Satellite signal receiving circuit and satellite signal receiving method - Google Patents
Satellite signal receiving circuit and satellite signal receiving method Download PDFInfo
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- 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
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- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
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Abstract
The application discloses a satellite signal receiving circuit and a satellite signal receiving method. The satellite signal receiving circuit comprises an oscillator, two mixers, two phase shifters, two low-pass filters, two phase operation circuits and a band-pass filter. When the frequency of the oscillator is between the center frequencies of the GLONASS system and the GPS/Galileo system, the satellite base frequency signals of the GLONASS system and the GPS/Galileo system can be obtained by phase addition and subtraction through the phase operation circuit, and the Beidou satellite base frequency signal can be obtained through the band-pass filter. When the frequency of the oscillator is between the center frequencies of the GPS/Galileo system and the Beidoo system, the satellite base frequency signals of Beidoo and GPS/Galileo can be obtained by phase addition and subtraction through the phase operation circuit, and the GLONASS satellite base frequency signals can be obtained through the band-pass filter.
Description
Technical Field
The present invention relates to a Global Navigation Satellite System (GNSS), and more particularly, to Satellite signal reception of the GNSS.
Background
Global Navigation Satellite System (GNSS) technology is widely used, and fig. 1 shows frequency bands (frequency bands) used by several Satellite systems. Band 110 corresponds to GLONASS System (GLONASS) of soviet union (center frequency 1602MHz), band 120 corresponds to Galileo Positioning System (Galileo) of european union (center frequency 1575.42MHz), band 130 corresponds to Global Positioning System (GPS) of the united states (center frequency 1575.42MHz), and band 140 corresponds to BeiDou Navigation Satellite System (BDS) of china (center frequency 1561.098 MHz). In order to increase the positioning speed and positioning accuracy of a satellite navigation receiver, many documents have been discussed in the art, such as US patent publication nos. US20090124221 and US20100097966, and US patent No. US 7551127. US patent publication US20090124221 uses two sets of receivers and two sets of frequency synthesizers to implement dual mode (double band) reception (i.e., simultaneously receiving two satellite signals of different center frequencies); however, using two sets of receivers simultaneously doubles the power consumption. The method for realizing dual-mode reception in U.S. patent publication No. US20100097966 is to share a low noise amplifier, and use a frequency synthesizer to output two oscillation signals to two down-conversion receiving paths respectively. US patent No. US7551127 utilizes a configurable (reconfigurable) frequency divider to achieve dual mode reception. One of the disadvantages of the dual mode receiver is that it can only receive satellite signals in two frequency bands, so that the positioning speed and positioning accuracy of the satellite navigation receiver are limited.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a satellite signal receiving circuit and a satellite signal receiving method capable of receiving three frequency bands simultaneously, so as to overcome the deficiencies of the prior art.
The invention discloses a satellite signal receiving circuit, which is used for receiving a satellite signal and comprises: an oscillator for generating a first reference signal; a first mixer, coupled to the oscillator, for mixing the first reference signal with the satellite signal to generate a first mixed signal; a first phase shifter, coupled to the oscillator, for adjusting a phase of the first reference signal to generate a second reference signal, wherein the first reference signal is orthogonal to the second reference signal; a second mixer, coupled to the first phase shifter, for mixing the second reference signal with the satellite signal to generate a second mixed signal; a first low pass filter coupled to the first mixer for filtering the first mixed signal to obtain a first filtered signal; a second low pass filter coupled to the second mixer for filtering the second mixed signal to obtain a second filtered signal; a second phase shifter coupled to the second low pass filter for adjusting the phase of the second filtered signal to generate a phase shifted signal; a first phase operation circuit coupled to the first low pass filter and the second phase shifter for operating the first filtered signal and the phase shifted signal to generate a first satellite baseband signal; a second phase operation circuit coupled to the first low-pass filter and the second phase shifter for operating the first filtered signal and the phase-shifted signal to generate a second satellite baseband signal; and a band-pass filter coupled to the first mixer and the second mixer for filtering the first mixed signal and the second mixed signal to obtain a third satellite baseband signal.
The invention further discloses a satellite signal receiving method, which comprises the following steps: (a) receiving a satellite signal; (b) providing a first reference signal; (c) mixing the first reference signal and the satellite signal to obtain an in-phase component of the satellite signal; (d) providing a second reference signal, wherein the first reference signal is orthogonal to the second reference signal; (e) mixing the second reference signal and the satellite signal to obtain a quadrature component of the satellite signal; (f) low-pass filtering the in-phase component of the satellite signal and the quadrature component of the satellite signal; (g) performing phase displacement on the low-pass filtered quadrature component of the satellite signal to generate a phase-displaced quadrature component; (h) calculating the sum of the in-phase component after the low-pass filtering and the orthogonal component after the phase displacement of the satellite signal to obtain a first satellite base frequency signal; (i) calculating the difference between the in-phase component of the satellite signal after low-pass filtering and the quadrature component of the satellite signal after phase displacement to obtain a second satellite base frequency signal; and (j) band-pass filtering the in-phase component of the satellite signal and the quadrature component of the satellite signal to obtain a third satellite baseband signal.
The invention utilizes a voltage-controlled oscillator (VCO) to realize three-mode (triple band) reception of satellite signals. Compared with the prior art, the satellite signal receiving circuit and the receiving method can not only improve the positioning speed and the positioning accuracy of the satellite navigation receiver, but also achieve the effects of saving electricity and circuit area.
The features, implementations and functions of the present invention will be described in detail with reference to the drawings.
Drawings
FIG. 1 shows frequency bands used by several satellite systems;
FIG. 2 is a block diagram of a satellite signal receiving circuit according to an embodiment of the present invention;
FIGS. 3A-3B are flowcharts of an embodiment of a satellite signal receiving method according to the present invention; and
FIG. 4 is a block diagram of a satellite signal receiving circuit according to another embodiment of the present invention.
Detailed Description
In the following description, the technical terms refer to the common terms in the technical field, and some terms are explained or defined in the specification, and the explanation of the some terms is based on the explanation or the definition in the specification.
The disclosure of the invention includes a satellite signal receiving circuit and a satellite signal receiving method, so as to improve the positioning speed and the positioning accuracy. Since some of the components included in the satellite signal receiving circuit of the present invention may be known components alone, the following description will omit details of known components without affecting the full disclosure and feasibility of the present invention. In addition, part or all of the procedures of the satellite signal receiving method of the present invention may be in the form of software and/or firmware, and may be executed by the satellite signal receiving circuit of the present invention or its equivalent device.
Fig. 2 is a functional block diagram of a satellite signal receiving circuit according to an embodiment of the invention, and fig. 3A and 3B are flowcharts of a satellite signal receiving method according to an embodiment of the invention. The details of the operation of the present invention will be described below with reference to fig. 2 and fig. 3A and 3B. The satellite signal receiving circuit 200 receives the satellite signal SA through the antenna 211 (step S305), and then amplifies the satellite signal SA into the satellite signal SB by using the amplifier 212 (for example, implemented by a low-noise amplifier (LNA)) (step S310). The satellite signal SA and the satellite signal SB can be represented by equations (1) and (2), respectively:
SA＝ARF1 cosωRF1 t+ARF2 cosωRF2 t+ARF3 cosωRF3 t (1)
SB＝G1(ARF1 cosωRF1 t+ARF2 cosωRF2 t+ARF3 cosωRF3 t) (2)
wherein, ω isRF1、ωRF2And omegaRF3Angular frequencies of band 110, band 120 (or band 130), and band (frequency band)140, i.e., [ omega ]RF1＝2π×1602×106、ωRF2＝2π×1575.42×106And ωRF3＝2π×1561.098×106；ARF1、ARF2And ARF3The amplitudes of band 110, band 120 (or band 130), and band 140, respectively; g1Is the gain of amplifier 212.
Next, a first reference signal and a second reference signal are provided, and the first reference signal and the second reference signal are orthogonal (in quadrature) (steps S315, S320). For example, in the present embodiment, the voltage-controlled oscillator 213 provides the frequency fLOThe phase of the first reference signal SO is adjusted by 90 ° by the quadrature phase shifter 214 to generate a second reference signal SOQ (step S320), where the first reference signal SO and the second reference signal SOQ can be expressed by equations (3) and (4), respectively:
SO＝cosωLO t (3)
SOQ＝sinωLO t (4)
wherein ω isLO＝2π/fLO. In other embodiments, the first reference signal SO and the second reference signal SOQ may be provided by separate voltage-controlled oscillators 213, but a circuit using one voltage-controlled oscillator is more power-saving than a circuit using two voltage-controlled oscillators, and a frequency pulling problem between the two oscillators can be avoided.
Frequency fL0Can be set to be between frequency bands 120 (or 130)The center frequency is between the center frequencies of the bands 110 and 120 (or 130) and 140. Then using the frequency f of the first reference signal SOLOSet between the center frequency of the band 120 (or 130) and the center frequency of the band 110 (i.e., ωRF2＜ωLO＜ωRF1) The present invention will be described in detail.
The first reference signal SO is then mixed with the satellite signal SB and the mixing result is low-pass filtered to obtain an in-phase (in-phase) component of the down-converted satellite signal (steps S325, S327). In detail, in the embodiment of fig. 2, the satellite signal receiving circuit 200 implements the two steps with a mixer 215 and a low-pass filter (LPF) 217. The mixer 215 mixes the satellite signal SB with the first reference signal SO to obtain a mixed signal SC, and the low-pass filter 217 low-pass filters the mixed signal SC to obtain a filtered signal SD. The mixed signal SC and the filtered signal SD can be represented by equations (5) and (6), respectively:
as can be seen from equations (5) and (6), the mixed signal SC is low-pass filtered to obtain the high-frequency component (cos (ω)LO+ωRF1)t、cos(ωLO+ωRF2) t and cos (. omega.) ofLO+ωRF3) t) and higher frequency components (cos (ω)LO+ωRF3) t) are filtered out.
Similar to steps S325 and S327, the second reference signal SOQ is mixed with the satellite signal SB and the mixed result is low-pass filtered to obtain a quadrature (quadrature) component of the down-converted satellite signal (steps S330, S332). In detail, in the embodiment of fig. 2, the satellite signal receiving circuit 200 implements the two steps with the mixer 216 and the low pass filter 218. The mixer 216 mixes the satellite signal SB with the second reference signal SOQ to obtain a mixed signal SG, and the low-pass filter 218 low-pass filters the mixed signal SG to obtain a filtered signal SH. The mixed signal SG and the filtered signal SH can be represented by the equations (7) and (8), respectively:
next, the in-phase component and the quadrature component of the satellite signal are amplified (step S335). In particular, in the embodiment of fig. 2, the filtered signal SD is implemented by an amplifier (amplifier)219 (e.g., a Programmable Gain Amplifier (PGA) having a gain G2) Amplified to an amplified filtered signal SE, and filtered signal SH is amplified by amplifier 220 (e.g., implemented as a programmable gain amplifier having a gain G2) Amplified to an amplified filtered signal SI. The amplified filtered signal SE and the amplified filtered signal SI may be represented by equations (9) and (10), respectively:
the quadrature component of the satellite signal is then phase shifted to produce a phase shifted quadrature component (step S340). In detail, the intermediate frequency quadrature phase shifter (IF90 ° phase shifter)221 performs phase shifting (for example, substantially shifting the phase by 90 °) on the amplified filtered signal SI to obtain a phase-shifted signal SJ, which can be represented by equation (11):
then, the sum of the in-phase component and the phase-shifted quadrature component of the satellite signal is calculated to obtain the first satellite baseband signal (step S345). In particular, because fLOThe center frequency of the frequency band 120 (or 130) is set to be between the center frequencies of the frequency bands 110, so that the satellite signal of the galileo positioning system (or the global positioning system) is an image signal of the satellite signal of the glonass system. The phase operation circuit 222 (for example, implemented as a phase adder) adds the amplified filtered signal SE and the phase-shifted signal SJ to obtain a satellite baseband signal SF, which can be represented by a formula (12):
SF＝SE+SJ
＝G1·G2·ARF1 cos(ωRF1-ωLO)t
＝G1·G2·ARF1 cosωIF1 t (12)
wherein ω isIF1＝ωRF1-ωLO。
Similarly, the difference between the in-phase component and the phase-shifted quadrature component of the satellite signal is calculated to obtain the second satellite baseband signal (step S350). In particular, because fLOSet between the center frequency of the band 120 (or 130) and the center frequency of the band 110, the satellite signal of the glonass system is also the mirror signal of the satellite signal of the galileo positioning system (or the global positioning system). The phase operation circuit 223 (for example, implemented as a phase adder) subtracts the amplified filtered signal SE and the phase-shifted signal SJ to obtain a satellite baseband signal SK, which can be represented by equation (13):
SK＝SE-SJ
＝G1·G2·ARF2 cos(ωLO-ωRF2)t
＝G1·G2·ARF2 cosωIF2 t (13)
wherein ω isIF2＝ωLO-ωRF2。
Next, the in-phase component and the quadrature component of the satellite signal are band-pass filtered to obtain another satellite baseband signal (step S355). In detail, in this step, a Band Pass Filter (BPF) 226 performs band pass filtering (i.e. filters out high frequency components (cos (ω) of the satellite signal) on the in-phase component (i.e. the mixed signal SC) and the quadrature component (i.e. the mixed signal SG) of the satellite signalLO+ωRF1)t、cos(ωLO+ωRF2) t and cos (. omega.) ofLO+ωRF3) t) and low frequency components (cos (ω)LO-ωRF1) t and cos (. omega.) ofLO-ωRF2) t) to obtain a satellite baseband signal SL (i.e., a band-pass filtered signal). The in-phase component (SL _ I) and the quadrature component (SL _ Q) of the satellite baseband signal SL can be represented by equations (14) and (15), respectively:
then, the satellite baseband signal SL can be represented by equation (16):
SL＝SL_I+SL_Q
＝G1·ARF3 cos(ωLO-ωRF3)t
＝G1·ARF3 cosωIF3 t (16)
wherein ω isIF3＝ωLO-ωRF3. The band pass filter 226 may be implemented, for example, as an image rejection band pass filter. The satellite baseband signal SL is amplified by an amplifier 227 (e.g., implemented as a programmable gain amplifier having a gain G)2) After amplification (step S360), the amplified satellite baseband signal SM is obtained, and the amplified satellite baseband signal SM can be represented by the equation (17):
SM＝G1·G2·ARF3 cosωIF3 t (17)
then, the satellite baseband signal SF, the satellite baseband signal SK and the amplified satellite baseband signal SM are converted to the digital domain by analog-to-digital converters (ADCs) 224, 225 and 228, respectively (step S365). In the digital domain, the Digital Signal Processor (DSP) 229 re-amplifies the three satellite baseband signals with a coding gain (coding gain) (step S370), and then generates position information from the three satellite baseband signals.
In summary, when the frequency f of the first reference signal SO is determinedLOIs set between the center frequency of the band 120 (or 130) and the center frequency of the band 110 (i.e., ωRF2＜ωLO＜ωRF1) When the satellite base frequency signal is received, the satellite base frequency signal SF corresponds to a satellite signal of a glonass system, the satellite base frequency signal SK corresponds to a satellite signal of a galileo positioning system or a global positioning system, and the satellite base frequency signal SL and the amplified satellite base frequency signal SM correspond to a satellite signal of a beidou satellite system. In a preferred embodiment, when fLOIs set as
fLOMay be equal to half of the sum of the substantially minimum frequency of band 120 (or 130) and the substantially maximum frequency of band 110. Taking the frequency band 120 as an example,
in other embodiments, the frequency f of the first reference signal SO is adjustedLOIs set between the center frequency of the band 120 (or 130) and the center frequency of the band 140 (i.e., ωRF3＜ωLO＜ωRF2) At this time, the satellite signal of the galileo positioning system (or the global positioning system) and the satellite signal of the beidou satellite navigation system are mirror image signals of each other, the satellite fundamental frequency signal SF corresponds to the satellite signal of the galileo positioning system or the global positioning system, the satellite fundamental frequency signal SK corresponds to the satellite signal of the beidou satellite system, and the satellite fundamental frequency signal SL and the amplified satellite fundamental frequency signal SM correspond to the satellite signal of the glonass system. In a preferred embodiment, when fLOIs set as
fLOMay be equal to half of the sum of the substantially maximum frequency of band 120 (or 130) and the substantially minimum frequency of band 140. Taking the frequency band 120 as an example,
in the embodiment shown in fig. 3A and 3B, swapping certain steps does not affect the implementation of the present invention. For example, step S330 may be performed first, and then step S327 may be performed; step S355 may be performed earlier than S345 and S350. In various embodiments, steps S340, S345 and S350 of fig. 3B can also be performed in the digital domain, that is, steps S340, S345 and S350 can also be performed after step S365, and the corresponding circuit diagram is shown in fig. 4. The satellite signal receiving circuit 400 performs steps S340, S345 and S350 in the digital domain by using the intermediate frequency quadrature phase shifter 421, the phase operation circuit 422 and the phase operation circuit 423. In some embodiments, the functions of the if quadrature phase shifter 421, the phase operation circuit 422 and the phase operation circuit 423 may also be implemented by the dsp 429, i.e., steps S340, S345 and S350 are performed by corresponding modules in the dsp 429. The modules may be implemented in hardware (e.g., circuitry) or in the form of program code or program instructions executed by control circuitry (e.g., a microcontroller, microprocessor, etc.) within the digital signal processor 429.
In summary, the invention realizes three-mode (triple band) reception of satellite signals, that is, the satellite signal receiving circuit and the satellite signal receiving method of the invention can simultaneously receive satellite signals with three different center frequencies. Although the embodiments described above are described with reference to the global navigation satellite system, the present invention is also applicable to other systems.
Since the details and variations of the method and invention disclosed herein can be understood by those skilled in the art from the disclosure of the apparatus and invention disclosed herein, the detailed description is repeated without departing from the spirit and scope of the invention. It should be noted that the shapes, sizes, proportions, and sequence of steps of the elements and steps shown in the drawings are illustrative only and not intended to limit the invention, for the understanding of the present invention by those skilled in the art.
Although the embodiments of the present invention have been described above, these embodiments are not intended to limit the present invention, and those skilled in the art can make variations on the technical features of the present invention according to the explicit or implicit contents of the present invention, and all such variations may fall within the scope of the patent protection sought by the present invention.
Description of the symbols
110. 120, 130, 140 frequency bands
200. 400 satellite signal receiving circuit
211 antenna
212. 219, 220, 227 amplifier
213 Voltage controlled Oscillator
214 quadrature phase shifter
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 band pass filter
229. 429 digital signal processor
SO first reference signal
SOQ second reference signal
SA, SB satellite signal
SC, SG mixed signal
SD, SH filtered signal
SE, SI amplified filtered signal
SF, SK, SL satellite base frequency signal
sJ phase shifted signal
SM amplified satellite base frequency signal
S305 to S370 steps
Claims (8)
1. A satellite signal receiving circuit for receiving a satellite signal, comprising:
an oscillator for generating a first reference signal;
a first mixer, coupled to the oscillator, for mixing the first reference signal with the satellite signal to generate a first mixed signal;
a first phase shifter, coupled to the oscillator, for adjusting a phase of the first reference signal to generate a second reference signal, wherein the first reference signal and the second reference signal are orthogonal;
a second mixer, coupled to the first phase shifter, for mixing the second reference signal with the satellite signal to generate a second mixed signal;
a first low pass filter coupled to the first mixer for filtering the first mixed signal to obtain a first filtered signal;
a second low pass filter coupled to the second mixer for filtering the second mixed signal to obtain a second filtered signal;
a second phase shifter coupled to the second low pass filter for adjusting the phase of the second filtered signal to generate a phase shifted signal;
a first phase operation circuit coupled to the first low pass filter and the second phase shifter for performing an addition operation on the first filtered signal and the phase shifted signal to generate a first satellite baseband signal;
a second phase operation circuit coupled to the first low-pass filter and the second phase shifter for performing subtraction operation on the first filtered signal and the phase-shifted signal to generate a second satellite baseband signal; and
a band-pass filter coupled to the first mixer and the second mixer for filtering the first mixed signal and the second mixed signal to obtain a third satellite baseband signal,
wherein the first satellite baseband signal corresponds to a Glonass (GLONASS) satellite system, the second satellite baseband signal corresponds to a Global Positioning System (GPS) or a Galileo positioning system (Galileo), the third satellite baseband signal corresponds to a Beidou (Beidou) satellite system, and the frequency of the first reference signal is between 1575.42MHz and 1602MHz,
wherein the frequency of the first reference signal is equal to half of the sum of the lowest frequency of the global positioning system or the galileo positioning system and the highest frequency of the glonass satellite system.
2. A satellite signal receiving circuit for receiving a satellite signal, comprising:
an oscillator for generating a first reference signal;
a first mixer, coupled to the oscillator, for mixing the first reference signal with the satellite signal to generate a first mixed signal;
a first phase shifter, coupled to the oscillator, for adjusting a phase of the first reference signal to generate a second reference signal, wherein the first reference signal and the second reference signal are orthogonal;
a second mixer, coupled to the first phase shifter, for mixing the second reference signal with the satellite signal to generate a second mixed signal;
a first low pass filter coupled to the first mixer for filtering the first mixed signal to obtain a first filtered signal;
a second low pass filter coupled to the second mixer for filtering the second mixed signal to obtain a second filtered signal;
a second phase shifter coupled to the second low pass filter for adjusting the phase of the second filtered signal to generate a phase shifted signal;
a first phase operation circuit coupled to the first low pass filter and the second phase shifter for performing an addition operation on the first filtered signal and the phase shifted signal to generate a first satellite baseband signal;
a second phase operation circuit coupled to the first low-pass filter and the second phase shifter for performing subtraction operation on the first filtered signal and the phase-shifted signal to generate a second satellite baseband signal; and
a band-pass filter coupled to the first mixer and the second mixer for filtering the first mixed signal and the second mixed signal to obtain a third satellite baseband signal,
wherein the first satellite baseband signal corresponds to a Global Positioning System (GPS) or a Galileo positioning system (Galileo), the second satellite baseband signal corresponds to a Beidou (Beidou) satellite system, the third satellite baseband signal corresponds to a Glonass (GLONASS) satellite system, and the frequency of the first reference signal is between 1575.42MHz and 1561.098MHz,
wherein the frequency of the first reference signal is equal to half of the sum of the highest frequency of the global positioning system or the Galileo positioning system and the lowest frequency of the Beidou satellite system.
3. The satellite signal receiving circuit according to claim 1 or 2, further comprising:
a first analog-to-digital converter coupled to the first phase operation circuit for converting the first satellite baseband signal to a digital domain;
a second analog-to-digital converter coupled to the second phase operation circuit for converting the second satellite baseband signal to a digital domain;
a third analog-to-digital converter, coupled to the band-pass filter, for converting the third satellite baseband signal into a digital domain; and
a digital signal processor coupled to the first adc, the second adc and the third adc for amplifying the first satellite baseband signal, the second satellite baseband signal and the third satellite baseband signal with a coding gain.
4. The satellite signal receiving circuit according to claim 1 or 2, further comprising:
a first analog-to-digital converter coupled between the first low pass filter and the first phase operation circuit for converting the first filtered signal to a digital domain;
a second analog-to-digital converter coupled between the second low pass filter and the second phase shifter for converting the second filtered signal to a digital domain;
a third analog-to-digital converter, coupled to the band-pass filter, for converting the third satellite baseband signal into a digital domain; and
a digital signal processor coupled to the first phase operation circuit, the second phase operation circuit and the third analog-to-digital converter for amplifying the first satellite baseband signal, the second satellite baseband signal and the third satellite baseband signal with a coding gain;
the second phase shifter, the first phase operation circuit and the second phase operation circuit complete operation in a digital domain.
5. A satellite signal receiving method, comprising:
(a) receiving a satellite signal;
(b) providing a first reference signal;
(c) mixing the first reference signal and the satellite signal to obtain an in-phase component of the satellite signal;
(d) providing a second reference signal, wherein the first reference signal and the second reference signal are orthogonal;
(e) mixing the second reference signal and the satellite signal to obtain a quadrature component of the satellite signal;
(f) low-pass filtering the in-phase component of the satellite signal and the quadrature component of the satellite signal;
(g) performing phase displacement on the low-pass filtered quadrature component of the satellite signal to generate a phase-displaced quadrature component;
(h) calculating the sum of the in-phase component of the satellite signal after low-pass filtering and the orthogonal component of the satellite signal after phase displacement to obtain a first satellite base frequency signal;
(i) calculating the difference between the in-phase component of the satellite signal after low-pass filtering and the quadrature component of the satellite signal after phase displacement to obtain a second satellite base frequency signal; and
(j) band-pass filtering the in-phase component of the satellite signal and the quadrature component of the satellite signal to obtain a third satellite baseband signal,
wherein the first satellite baseband signal corresponds to a Glonass (GLONASS) satellite system, the second satellite baseband signal corresponds to a Global Positioning System (GPS) or a Galileo positioning system (Galileo), the third satellite baseband signal corresponds to a Beidou (Beidou) satellite system, and the frequency of the first reference signal is between 1575.42MHz and 1602MHz,
wherein the frequency of the first reference signal is equal to half of the sum of the lowest frequency of the global positioning system or the galileo positioning system and the highest frequency of the glonass satellite system.
6. A satellite signal receiving method, comprising:
(a) receiving a satellite signal;
(b) providing a first reference signal;
(c) mixing the first reference signal and the satellite signal to obtain an in-phase component of the satellite signal;
(d) providing a second reference signal, wherein the first reference signal and the second reference signal are orthogonal;
(e) mixing the second reference signal and the satellite signal to obtain a quadrature component of the satellite signal;
(f) low-pass filtering the in-phase component of the satellite signal and the quadrature component of the satellite signal;
(g) performing phase displacement on the low-pass filtered quadrature component of the satellite signal to generate a phase-displaced quadrature component;
(h) calculating the sum of the in-phase component of the satellite signal after low-pass filtering and the orthogonal component of the satellite signal after phase displacement to obtain a first satellite base frequency signal;
(i) calculating the difference between the in-phase component of the satellite signal after low-pass filtering and the quadrature component of the satellite signal after phase displacement to obtain a second satellite base frequency signal; and
(j) band-pass filtering the in-phase component of the satellite signal and the quadrature component of the satellite signal to obtain a third satellite baseband signal,
wherein the first satellite baseband signal corresponds to a Global Positioning System (GPS) or a Galileo positioning system (Galileo), the second satellite baseband signal corresponds to a Beidou (Beidou) satellite system, the third satellite baseband signal corresponds to a Glonass (GLONASS) satellite system, and the frequency of the first reference signal is between 1575.42MHz and 1561.098MHz,
wherein the frequency of the first reference signal is equal to half of the sum of the highest frequency of the global positioning system or the Galileo positioning system and the lowest frequency of the Beidou satellite system.
7. The satellite signal receiving method according to claim 5 or 6, further comprising:
(k) converting the first satellite baseband signal, the second satellite baseband signal and the third satellite baseband signal into a digital domain; and
(l) Amplifying the first satellite baseband signal, the second satellite baseband signal and the third satellite baseband signal by a coding gain.
8. The satellite signal receiving method according to claim 5 or 6, further comprising:
(k) converting the low-pass filtered in-phase component of the satellite signal to the digital domain;
(l) Converting the low-pass filtered quadrature component of the satellite signal to the digital domain;
(m) converting the third satellite baseband signal to the digital domain; and
(n) amplifying the first, second, and third satellite baseband signals with a coding gain;
wherein step (k) and step (l) are performed prior to step (g), step (h) and step (i).
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| CN201810162465.5A CN110196437B (en) | 2018-02-26 | 2018-02-26 | Satellite signal receiving circuit and satellite signal receiving method |
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