CN105277956A - Method for converting GPS satellite signal to baseband signal - Google Patents
Method for converting GPS satellite signal to baseband signal Download PDFInfo
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- CN105277956A CN105277956A CN201410855742.2A CN201410855742A CN105277956A CN 105277956 A CN105277956 A CN 105277956A CN 201410855742 A CN201410855742 A CN 201410855742A CN 105277956 A CN105277956 A CN 105277956A
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Abstract
The present invention discloses a method for converting a GPS satellite signal to a baseband signal. The method comprises the steps of carrying out amplifying processing on the GPS satellite signal; carrying out three-way multiplexing on the processed GPS satellite signal, thus to realize stripping of satellite signals with various frequency bands; carrying out up-conversion processing on the stripped satellite signal and a low local oscillator carrier signal; carrying out I/Q separation on the converted satellite signal and then combining the converted satellite signal with a high local oscillator carrier signal to produce a near-zero intermediate-frequency signal; and converting the near-zero intermediate-frequency signal to a zero intermediate frequency digital signal through digital-to-analogue conversion. With adoption of the method provided by the present invention, image interference is lowered, crosstalk among various satellite signals is reduced, and an adequate signal to noise ratio is provided for a baseband processing circuit.
Description
Technical field
The present invention relates to gps satellite signal process field, particularly relate to a kind of method gps satellite signal being converted to baseband signal.
Background technology
GPS (English: GlobalPositioningSystem is called for short GPS), also known as Global Positioning System (GPS), is a round orbiter navigational system of middle distance.It can be located accurately for earth surface overwhelming majority area provides, test the speed and high-precision time standard.Can meet and be positioned at the whole world Anywhere or the accurate continuously determination three-dimensional position of the user of terrestrial space, three-dimensional motion and the needs of time.
Gps satellite signal adopts the synthesis of CDMA (CDMA) modulation technique, and its complete signal comprises carrier wave, pseudo-random code and numeric data code.Signal carrier is in L-band, and within three years, wave frequency remembers L1 (1575.42MHz), L2 (1227.6MHz) and L5 (1176.45MHz) respectively.At present every satellite all at L1 and L2 two frequencies and part satellite at L5 transmitted on frequencies ranging code and navigation message.This navigation message includes: the modified value etc. that the orbit parameter of satellite, timing parameter, orbital exponent parameter, air reflect gps signal, and navigation message is for the position (in satellite constellation absolute position) during receiver user determination satellite emission signal and time; Beating for calculating time from satellite to receiver and propagation delay time of ranging code code element, and then convert distance to, thus obtain the relative distance of subscriber computer to satellite.Absolute position combines with relative position and just obtains the absolute position of receiver user.
The working method that the GPS circuit of current practical application is general is leached from neighbourhood noise by gps satellite signal, provides suitable gain, and be converted into baseband digital signal, to meet the demand of follow-up baseband digital signal processing unit.Therefore, usual way uses frequency mixer to carry out down coversion to gps satellite signal.Greatly can reduce the technical indicator demand parameter demand difficulty to A/D change-over circuit and baseband processing circuitry like this, but utilizing frequency mixer to be transformed to by high frequency gps satellite signal introduces image interference compared with while low-IF frequency.
Summary of the invention
In view of current gps satellite signal process field above shortcomings, the invention provides a kind of method gps satellite signal being converted to baseband signal, can image interference be reduced, and reduce the crosstalk between each satellite-signal.
For achieving the above object, embodiments of the invention adopt following technical scheme:
Gps satellite signal is converted to a method for baseband signal, described method gps satellite signal being converted to baseband signal comprises the following steps:
Gps satellite signal is carried out amplification process;
Gps satellite signal after process is carried out the three multiplexing realizations in tunnel peel off the satellite-signal of each frequency range;
Satellite-signal after stripping and low local oscillator carrier signal are carried out upconversion process;
Synthesize with high local oscillator carrier signal after satellite-signal after frequency conversion being carried out I/Q separation and produce nearly zero intermediate frequency signals;
It is zero intermediate frequency digital signal that this nearly zero intermediate frequency signals is carried out digital-to-analog conversion, and described zero intermediate frequency digital signal is baseband signal.
According to one aspect of the present invention, described being carried out by gps satellite signal amplifies specifically can be of process: adopt the reception of low noise amplifier circuit from the gps satellite signal of antenna, then carry out amplification process.
According to one aspect of the present invention, describedly gps satellite signal after process is carried out the three multiplexing realizations in tunnel and the satellite-signal of each frequency range is peeled off comprise: by power divider circuits by being divided into the satellite-signal of GPSL1/L2/L5 tri-frequency ranges to gps satellite signal, realize three tunnels multiplexing.
According to one aspect of the present invention, describedly gps satellite signal after process is carried out the three multiplexing realizations in tunnel and the satellite-signal of each frequency range is peeled off comprise: the wave filter for the gps satellite signal particular centre frequency of different frequency range carries out gating, realizes peeling off the satellite-signal of GPSL1/L2/L5 tri-frequency ranges.
According to one aspect of the present invention, described satellite-signal after peeling off and low local oscillator carrier signal are carried out upconversion process and comprise: the carrier signal of the generation of gps satellite signal and local oscillation circuit is carried out upconversion process by image-reject mixer, produce a new frequency, the new signal frequency value produced equals satellite frequency value and adds low local oscillator carrier signal.
According to one aspect of the present invention, described low local oscillator carrier signal is produced by low local oscillation circuit, and the carrier center frequency scope of described low local oscillation circuit is 300MHz-400MHz.
According to one aspect of the present invention, described method gps satellite signal being converted to baseband signal also comprises: carry out amplification process by agc circuit to nearly zero intermediate frequency signals.
According to one aspect of the present invention, describedly satellite-signal after frequency conversion is carried out to synthesize with high local oscillator carrier signal after I/Q is separated producing nearly zero intermediate frequency signals and comprising: carry out 1/4 phase place adjustment to the local oscillation signal that local oscillation circuit produces, separate I/Q two-way, the I/Q being then respectively used to realize satellite-signal is separated.
According to one aspect of the present invention, describedly satellite-signal after frequency conversion is carried out synthesize with high local oscillator carrier signal after I/Q is separated producing nearly zero intermediate frequency signals and comprising: by frequency mixer, the carrier signal that satellite-signal and local oscillator export is synthesized the new signal producing close zero intermediate frequency, then filter through low-pass filter, obtain pure zero intermediate frequency signals.
According to one aspect of the present invention, described high local oscillator carrier signal is produced by high local oscillation circuit, and described high local oscillation circuit reference carrier frequency is 1545MHz-1615MHz.
Advantage of the invention process: method gps satellite signal being converted to baseband signal of the present invention is peeled off the satellite-signal of each frequency range by the gps satellite signal after amplification is carried out the three multiplexing realizations in tunnel, satellite-signal after stripping and low local oscillator carrier signal are carried out upconversion process, synthesize with high local oscillator carrier signal after subsequently the satellite-signal after frequency conversion being carried out I/Q separation and produce nearly zero intermediate frequency signals, then become baseband signal through digital-to-analog conversion.All independent signal transacting is carried out to the gps satellite signal of each frequency range, upconversion process is carried out to the gps satellite signal of each frequency range, reduce image interference, the carrier frequency realizing each frequency signal of GPS is planned as a whole, each frequency signal is carried out independently again to down coversion, filtering, amplification and A/D are converted to baseband signal, reduce the crosstalk between each satellite-signal, for baseband processing circuitry provides enough signal to noise ratio (S/N ratio)s, both reduce and signal quality in turn ensure that to the technical indicator demand of A/D change-over circuit and Baseband processing algorithm.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of method schematic diagram gps satellite signal being converted to baseband signal of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of method gps satellite signal being converted to baseband signal, described method gps satellite signal being converted to baseband signal comprises the following steps:
Step S1: gps satellite signal is carried out amplification process;
The embodiment that gps satellite signal is carried out amplifying process by described step S1 can be: receive the gps satellite signal from antenna, then adopts low noise amplifier circuit to carry out amplification process.
Step S2: the gps satellite signal after process is carried out the three multiplexing realizations in tunnel the satellite-signal of each frequency range is peeled off;
Gps satellite signal after process is carried out the three multiplexing realizations in tunnel and can be the embodiment that the satellite-signal of each frequency range is peeled off by described step S2: gps satellite signal will be divided into the satellite-signal of GPSL1/L2/L5 tri-frequency ranges by power divider circuits, realize three tunnels multiplexing, namely say that gps satellite signal is divided into the satellite-signal of GPSL1/L2/L5 tri-frequency ranges stand-by by power divider circuits, then the wave filter for the gps satellite signal particular centre frequency of different frequency range carries out gating, realizes peeling off the satellite-signal of GPSL1/L2/L5 tri-frequency ranges.
In actual applications, the centre frequency of the wave filter of the characteristic centre frequency that the satellite-signal of described GPSL1 frequency range is corresponding is 1575.42MHz; The centre frequency of the wave filter of the characteristic centre frequency that the satellite-signal of described GPSL2 frequency range is corresponding is 1227.6MHz; The centre frequency of the wave filter of the characteristic centre frequency that the satellite-signal of described GPSL5 frequency range is corresponding is 1176.45MHz.
Step S3: the satellite-signal after stripping and low local oscillator carrier signal are carried out upconversion process;
The embodiment that satellite-signal after stripping and low local oscillator carrier signal carry out upconversion process can be by described step S3: produce a local oscillator carrier signal by low local oscillation circuit, then by frequency mixer, the carrier signal of the generation of gps satellite signal and this local oscillation circuit is carried out upconversion process by image-reject mixer, produce a new frequency, the new signal frequency value produced equals satellite frequency value and adds low local oscillator frequency of carrier signal value.Local oscillation circuit is made up of start-oscillation circuit, local oscillator chip, loop filter and steering logic.Start-oscillation circuit components and parts model selects according to local oscillator chip reference frequency output; Local oscillator chip is according to the instruction of steering logic unit, and the carrier frequency signaling relying on start-oscillation circuit and loop filter to realize needing exports; Loop filter circuit determines the good and bad characteristic of the phase noise of local carrier signal; Steering logic assigns instruction to local oscillation circuit, and detects the output state of local oscillation circuit.
In actual applications, described low local oscillator carrier signal is produced by low local oscillation circuit, and the carrier center frequency scope that the local oscillator of described low local oscillation circuit exports is 300MHz-400MHz.
Step S4: synthesize with high local oscillator carrier signal after the satellite-signal after frequency conversion being carried out I/Q separation and produce nearly zero intermediate frequency signals;
Satellite-signal after frequency conversion is carried out synthesizing with high local oscillator carrier signal the embodiment producing nearly zero intermediate frequency signals after I/Q is separated and can be by described step S4: produce a high local oscillation signal by high local oscillator generation circuit, 1/4 phase place adjustment is carried out to this local oscillation signal, separate I/Q two-way, the I/Q being then respectively used to realize satellite-signal is separated.Then carrier signal (I/Q) synthesis satellite-signal and local oscillator exported by frequency mixer produces the new signal near zero intermediate frequency.
In actual applications, described high local oscillation circuit and low local oscillation circuit are same principles, only because outgoing carrier frequency is different, peripheral start-oscillation circuit, loop filter circuit are different, and the carrier center that described high local oscillation circuit exports frequently scope is 1545MHz-1615MHz.
Step S5: it is zero intermediate frequency digital signal that this nearly zero intermediate frequency signals is carried out digital-to-analog conversion, and described zero intermediate frequency digital signal is baseband signal;
It is zero intermediate frequency digital signal that this nearly zero intermediate frequency signals is carried out digital-to-analog conversion by described step S5, the embodiment that described zero intermediate frequency digital signal is baseband signal can be: first nearly zero intermediate frequency signals is filtered through low-pass filter, after obtaining pure zero intermediate frequency signals, with high-speed ADC integrated circuit, analog to digital conversion is carried out to the zero intermediate frequency signals exported again, to obtain zero intermediate frequency digital signal, described zero intermediate frequency digital signal is baseband signal.
In actual applications, described step S5 also carries out amplification process by agc circuit to nearly zero intermediate frequency signals before performing, and the signal power strength that the enlargement factor of AGC obtains according to rear end Baseband algorithms adjusts.
Advantage of the invention process: method gps satellite signal being converted to baseband signal of the present invention is peeled off the satellite-signal of each frequency range by the gps satellite signal after amplification is carried out the three multiplexing realizations in tunnel, satellite-signal after stripping and low local oscillator carrier signal are carried out upconversion process, synthesize with high local oscillator carrier signal after subsequently the satellite-signal after frequency conversion being carried out I/Q separation and produce nearly zero intermediate frequency signals, then become baseband signal through digital-to-analog conversion.All independent signal transacting is carried out to the gps satellite signal of each frequency range, upconversion process is carried out to the gps satellite signal of each frequency range, reduce image interference, the carrier frequency realizing each frequency signal of GPS is planned as a whole, each frequency signal is carried out independently again to down coversion, filtering, amplification and A/D are converted to baseband signal, reduce the crosstalk between each satellite-signal, for baseband processing circuitry provides enough signal to noise ratio (S/N ratio)s, both reduce and signal quality in turn ensure that to the technical indicator demand of A/D change-over circuit and Baseband processing algorithm.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, the technician of any skilled is in technical scope disclosed by the invention; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. gps satellite signal is converted to a method for baseband signal, it is characterized in that, described method gps satellite signal being converted to baseband signal comprises the following steps:
Gps satellite signal is carried out amplification process;
Gps satellite signal after process is carried out the three multiplexing realizations in tunnel peel off the satellite-signal of each frequency range;
Satellite-signal after stripping and low local oscillator carrier signal are carried out upconversion process;
Synthesize with high local oscillator carrier signal after satellite-signal after frequency conversion being carried out I/Q separation and produce nearly zero intermediate frequency signals;
It is zero intermediate frequency digital signal that this nearly zero intermediate frequency signals is carried out digital-to-analog conversion, and described zero intermediate frequency digital signal is baseband signal.
2. method gps satellite signal being converted to baseband signal according to claim 1, it is characterized in that, described being carried out by gps satellite signal amplifies specifically can be of process: adopt the reception of low noise amplifier circuit from the gps satellite signal of antenna, then carry out amplification process.
3. method gps satellite signal being converted to baseband signal according to claim 1, it is characterized in that, describedly gps satellite signal after process is carried out the three multiplexing realizations in tunnel and the satellite-signal of each frequency range is peeled off comprise: by power divider circuits by being divided into the satellite-signal of GPSL1/L2/L5 tri-frequency ranges to gps satellite signal, realize three tunnels multiplexing.
4. method gps satellite signal being converted to baseband signal according to claim 3, it is characterized in that, describedly gps satellite signal after process is carried out the three multiplexing realizations in tunnel and the satellite-signal of each frequency range is peeled off comprise: the wave filter for the gps satellite signal particular centre frequency of different frequency range carries out gating, realizes peeling off the satellite-signal of GPSL1/L2/L5 tri-frequency ranges.
5. method gps satellite signal being converted to baseband signal according to claim 1, it is characterized in that, described satellite-signal after peeling off and low local oscillator carrier signal are carried out upconversion process and comprise: the carrier signal of the generation of gps satellite signal and local oscillation circuit is carried out upconversion process by image-reject mixer, produce a new frequency, the new signal frequency value produced equals satellite frequency value and adds low local oscillator carrier signal.
6. method gps satellite signal being converted to baseband signal according to claim 5, is characterized in that, described low local oscillator carrier signal is produced by low local oscillation circuit, and the carrier center frequency scope of described low local oscillation circuit is 300MHz-400MHz.
7. method gps satellite signal being converted to baseband signal according to claim 8, is characterized in that, described method gps satellite signal being converted to baseband signal also comprises: carry out amplification process by agc circuit to nearly zero intermediate frequency signals.
8. according to method gps satellite signal being converted to baseband signal one of claim 1 to 7 Suo Shu, it is characterized in that, describedly satellite-signal after frequency conversion is carried out to synthesize with high local oscillator carrier signal after I/Q is separated producing nearly zero intermediate frequency signals and comprising: carry out 1/4 phase place adjustment to the local oscillation signal that local oscillation circuit produces, separate I/Q two-way, the I/Q being then respectively used to realize satellite-signal is separated.
9. method gps satellite signal being converted to baseband signal according to claim 8, it is characterized in that, describedly satellite-signal after frequency conversion is carried out to synthesize with high local oscillator carrier signal after I/Q is separated producing nearly zero intermediate frequency signals and comprising: by frequency mixer, the carrier signal that the satellite-signal after being separated and local oscillator export is synthesized the new signal producing close zero intermediate frequency, then filter through low-pass filter, obtain pure zero intermediate frequency signals.
10. method gps satellite signal being converted to baseband signal according to claim 9, is characterized in that, described high local oscillator carrier signal is produced by high local oscillation circuit, and described high local oscillation circuit reference carrier frequency is 1545MHz-1615MHz.
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Application publication date: 20160127 |