CN103197324A - Method for generating satellite navigation signals in minimum shift keying (MSK) or Gaussian filtered minimum shift keying (GMSK) modulation mode - Google Patents
Method for generating satellite navigation signals in minimum shift keying (MSK) or Gaussian filtered minimum shift keying (GMSK) modulation mode Download PDFInfo
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Abstract
The invention discloses a system and a method for generating satellite navigation signals based on a minimum shift keying (MSK) or a Gaussian filtered minimum shift keying (GMSK) modulation mode. The system comprises a first pseudorandom sequence navigation data adding unit, a second pseudorandom sequence navigation data adding unit, a first subcarrier input unit, a second subcarrier input unit, a plurality of modulo two addition units and an MSK or GMSK modulator. The method comprises the steps of enabling a pseudorandom sequence I and navigation data I to form a sequence through modulo two addition and then to obtain a signal CI through the modulo two addition with a subcarrier I, enabling a pseudorandom sequence Q and navigation data Q to form a sequence through the modulo two addition and then to obtain a signal CQ through the modulo two addition with a subcarrier Q, and carrying out the modulo two addition on the signal CI and the signal CQ to obtain a signal CIQ for MSK or GMSK modulation. According to the system and the method for generating the satellite navigation signals based on the MSK or the GMSK modulation mode, the advantages that MSK or GMSK is rapid in power attenuation and constant in enveloping are remained, meanwhile a common binary phase shift keying (BPSK) mode receiver can be used for receiving, the method and the system are particularly suitable for navigation frequency ranges with limited bandwidth and facilitate utilization of a high-power amplifier by a satellite, and complexity of the receiver can not be greatly increased.
Description
Technical field
The present invention relates to the satellite navigation technical field, is the method that a kind of MSK of use or GMSK modulation mode produce satellite navigation signals, is the application on satellite navigation signals produces of MSK or GMSK technology.
Background technology
BPSK (Binary Phase Shift Keying is generally adopted in the satellite navigation field at present, two-phase PSK), QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) and BOC (Binary Offset Carrier, binary offset carrier) technology realizes the data modulation and receives, these several technology all use square-wave signal as baseband signal waveform, in actual transmissions, precipitous rising edge makes frequency spectrum wideer, and power comparatively disperses.
Under the abundant situation of electromagnetic spectrum, these technology meet the demands fully, but along with increasing of Space Microwave systems such as satellite navigation, the frequency resource growing tension, this just needs following satellite navigation system minimizing frequency spectrum resource to take, thus the unlikely work that influences other adjacent microwave systems of frequency.
MSK (Minimum Shift Keying, minimum shift keying) and GMSK (Gaussian Filtered Minimum Shift Keying, GMSK (Guassian Minimum Shift Keying), a kind of special MSK) has the function of carrying two paths of signals simultaneously, have permanent envelope properties simultaneously, can take full advantage of the satellite power amplifier.But its defective that directly applies to satellite navigation is one-level in the end, because the autocorrelation performance that the information that baseband digital signal carries does not have pseudo-random sequence, therefore when satellite navigation signals arrives ground under the extremely faint situation, can't utilize correlation detection and the tracking signal of pseudo-random sequence, this makes MSK and GMSK can't directly apply to this system.
Satellite navigation signals production method provided by the present invention has increased a fairly simple pretreatment unit, directly uses common MSK or GMSK modulator acquisition baseband I then, (the I branch road is the real part of complex signal to the Q branch road, the Q branch road is the imaginary part of complex signal) signal, be modulated to radio frequency again and launch, receive the correlativity that baseband processing unit just can take full advantage of its signal like this and carry out detection and tracking.
Summary of the invention
In order to solve above-mentioned existing in prior technology problem, the objective of the invention is to make MSK or GMSK modulator applications in the generation of satellite navigation signals, the satellite navigation signals that produces with toilet obtains amplitude-frequency attenuation characteristic and permanent envelope trait preferably.
According to an aspect of the present invention, propose a kind of satellite navigation signals based on MSK or GMSK modulation mode and produce system, this system comprises: the first pseudo-random sequence navigation data addition unit, the second pseudo-random sequence navigation data addition unit, the first subcarrier input block, the second subcarrier input block, a plurality of moulds two add the unit, MSK or GMSK modulator, wherein:
The described first pseudo-random sequence navigation data addition unit adds sequence of composition for the pseudo-random sequence I that needs is modulated to in-phase component and navigation data I by mould two;
The described second pseudo-random sequence navigation data addition unit adds sequence of composition for the pseudo-random sequence Q that needs is modulated to quadrature component and navigation data Q by mould two;
The described first subcarrier input block is for the in-phase component I of input subcarrier;
The described second subcarrier input block is for the quadrature component Q of input subcarrier;
Described a plurality of mould two adds the unit and is respectively applied to that mould two additions are carried out in the output of the in-phase component I of described subcarrier and the described first pseudo-random sequence navigation data addition unit and obtains signal CI, mould two additions are carried out in the output of the quadrature component Q of described subcarrier and the described second pseudo-random sequence navigation data addition unit obtained signal CQ and signal CI and CQ are carried out mould two additions obtaining signal CIQ;
Described MSK or GMSK modulator are used for described signal CIQ is carried out MSK or GMSK modulation, thereby obtain base band in-phase branch signal and base band quadrature branch signal.
According to a further aspect in the invention, also propose a kind of satellite navigation signals production method based on MSK or GMSK modulation mode, this method may further comprise the steps:
Step 3 is carried out mould two additions with signal CI and CQ and is obtained signal CIQ;
Step 4 is carried out MSK or GMSK modulation to described signal CIQ, thereby is obtained base band in-phase branch signal and base band quadrature branch signal.
The present invention has kept MSK or the GMSK power attenuation is very fast and the characteristics of permanent envelope, can use simultaneously common BPSK mode receiver to receive, therefore be particularly suitable for the limited navigation frequency range of bandwidth, 5010～5030MHz of C-band for example, and be convenient to satellite and use high power amplifier, and can significantly not increase the receiver complexity.
Description of drawings
Fig. 1 is that the satellite navigation signals that the present invention is based on MSK or GMSK modulation mode produces system construction drawing.
Fig. 2 is the information phase place corresponding relation synoptic diagram of each signal among the present invention.
Fig. 3 is the satellite navigation signals production method process flow diagram that the present invention is based on MSK or GMSK modulation mode.
Fig. 4 is the power spectrum density contrast synoptic diagram of the satellite navigation signals that produces according to one embodiment of the invention.
Fig. 5 is the permanent envelope properties synoptic diagram of the satellite navigation signals that produces according to one embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is that the satellite navigation signals that the present invention is based on MSK or GMSK modulation mode produces system construction drawing, as shown in Figure 1, described satellite navigation signals generation system comprises: the first pseudo-random sequence navigation data addition unit, the second pseudo-random sequence navigation data addition unit, the first subcarrier input block, the second subcarrier input block, a plurality of moulds two add the unit, MSK or GMSK modulator, signal flows along the direction of arrow shown in Fig. 1, wherein:
The described first pseudo-random sequence navigation data addition unit, add sequence of composition for the pseudo-random sequence (being designated as pseudo-random sequence I) that needs is modulated to in-phase component and navigation data (being designated as navigation data I) by mould two, described needs are modulated to pseudo-random sequence and the sequence of navigation data for being made up of two numerical value of in-phase component: form by 0 and 1, perhaps form by 1 and-1, the speed of this sequence is designated as fcode (unit is bps), and initial phase is designated as zeta (unit is degree);
The described second pseudo-random sequence navigation data addition unit, add sequence of composition for the pseudo-random sequence (being designated as pseudo-random sequence Q) that needs is modulated to quadrature component and navigation data (being designated as navigation data Q) by mould two, pseudo-random sequence and navigation data that described needs are modulated to quadrature component are by 0 or 1 sequence of forming, the speed of this sequence equals fcode (unit is bps), and phase place is the zeta+90 degree;
The described first subcarrier input block, for the in-phase component (being designated as subcarrier I) of input subcarrier, this part is square wave, and frequency equals fcode/2 (unit is Hz), and initial phase is the zeta degree;
The described second subcarrier input block, for the quadrature component (being designated as subcarrier Q) of input subcarrier, this part is square wave, and frequency equals fcode/2 (unit is Hz), and first phase is the zeta+180 degree;
Described a plurality of mould two adds the unit and is respectively applied to that mould two additions are carried out in the output of the in-phase component of described subcarrier and the described first pseudo-random sequence navigation data addition unit and obtains signal CI, mould two additions are carried out in the output of the quadrature component of described subcarrier and the described second pseudo-random sequence navigation data addition unit obtained signal CQ, signal CI and CQ are carried out mould two additions obtain signal CIQ;
Described MSK or GMSK modulator are used for described signal CIQ is carried out MSK or GMSK modulation, thereby obtain base band in-phase branch signal (I tributary signal) and base band quadrature branch signal (Q tributary signal).
Wherein, the principle of work that mould two adds the unit is: 0 mould two adds 0 and equals 0,1 mould two and add 1 and equal 0,1 mould two and add 0 and equal 1,0 mould two and add 1 and equal 1, and this is equal to XOR at circuit; If be transformed to 1 with 0, be transformed to-1 with 1, then be equal to and multiply each other.
Total system is before work, need to guarantee pseudo-random sequence I and navigation data I's and sequence, pseudo-random sequence Q and generation clock navigation data Q and sequence satisfy the phase relation that differs 90 degree, such as the degree of 90 as Fig. 2 (a) and (b) phase relation, and subcarrier I and subcarrier Q also need satisfy the phase relation that differs 180 degree, such as the degree of 180 as Fig. 2 (c) and (d) phase relation, such signal CI that produces, signal CQ, signal CIQ, the phase place synoptic diagram of base band in-phase branch signal and base band quadrature branch signal such as Fig. 2 (e), (f), (g), (h), (i) shown in.
In addition, as shown in Figure 2, each circuit-switched data is imported in system of the present invention pointwise under when work will the driving at clock, and the signal of pointwise output baseband I branch road and base band Q branch road, these two tributary signals have strict corresponding relationship at the pseudo-random sequence+navigation data of time domain and input, therefore lose the correlation properties of signal when catching and follow the tracks of hardly.
Fig. 3 is the satellite navigation signals production method process flow diagram that the present invention is based on MSK or GMSK modulation mode, and as shown in Figure 3, described satellite navigation signals production method based on MSK or GMSK modulation mode may further comprise the steps:
Step 3 is carried out mould two additions with signal CI and CQ and is obtained signal CIQ;
Step 4 is carried out MSK or GMSK modulation to described signal CIQ, thereby is obtained base band in-phase branch signal (I tributary signal) and base band quadrature branch signal (Q tributary signal).
Utilize the above-mentioned satellite navigation signals that produces based on the satellite navigation signals generation system and method for MSK or GMSK modulation mode of the present invention can obtain good amplitude-frequency attenuation characteristic and permanent envelope trait, and can use the BPSK satellite navigation receiver to receive, the satellite navigation frequency range that is particularly suitable for C-band 5010～5030MHz is used.
Fig. 4 and Fig. 5 have showed good spectral characteristic and the permanent envelope trait of the satellite navigation signals that produces based on MSK or GMSK modulation mode.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the satellite navigation signals based on MSK or GMSK modulation mode produces system, it is characterized in that, this system comprises: the first pseudo-random sequence navigation data addition unit, the second pseudo-random sequence navigation data addition unit, the first subcarrier input block, the second subcarrier input block, a plurality of moulds two add the unit, MSK or GMSK modulator, wherein:
The described first pseudo-random sequence navigation data addition unit adds sequence of composition for the pseudo-random sequence I that needs is modulated to in-phase component and navigation data I by mould two;
The described second pseudo-random sequence navigation data addition unit adds sequence of composition for the pseudo-random sequence Q that needs is modulated to quadrature component and navigation data Q by mould two;
The described first subcarrier input block is for the in-phase component I of input subcarrier;
The described second subcarrier input block is for the quadrature component Q of input subcarrier;
Described a plurality of mould two adds the unit and is respectively applied to that mould two additions are carried out in the output of the in-phase component I of described subcarrier and the described first pseudo-random sequence navigation data addition unit and obtains signal CI, mould two additions are carried out in the output of the quadrature component Q of described subcarrier and the described second pseudo-random sequence navigation data addition unit obtained signal CQ and signal CI and CQ are carried out mould two additions obtaining signal CIQ;
Described MSK or GMSK modulator are used for described signal CIQ is carried out MSK or GMSK modulation, thereby obtain base band in-phase branch signal and base band quadrature branch signal.
2. system according to claim 1 is characterized in that, described needs are modulated to the pseudo-random sequence I of in-phase component and the sequence of navigation data I for being made up of two numerical value: form by 0 and 1, perhaps form by 1 and-1; The speed of described sequence is fcode bps, and initial phase is the zeta degree.
3. system according to claim 1 is characterized in that, pseudo-random sequence Q and navigation data Q that described needs are modulated to quadrature component are by 0 or 1 sequence of forming; The speed of described sequence is fcode bps, and phase place is the zeta+90 degree.
4. system according to claim 1 is characterized in that, the in-phase component I of described subcarrier is square wave, and frequency is fcode/2Hz, and initial phase is the zeta degree; The quadrature component Q of described subcarrier is square wave, and frequency is fcode/2Hz, and first phase is the zeta+180 degree.
5. system according to claim 1 is characterized in that, described pseudo-random sequence I and navigation data be I's and sequence, satisfies the phase relations that differ 90 degree with pseudo-random sequence Q and generation clock navigation data Q and sequence; The generation clock of described subcarrier I and subcarrier Q satisfies the phase relation that differs 180 degree.
6. satellite navigation signals production method based on MSK or GMSK modulation mode is characterized in that this method may further comprise the steps:
Step 1 is modulated to the pseudo-random sequence I of in-phase component and navigation data I with needs and adds by mould two and form a sequence, and carries out mould two additions with the in-phase component of subcarrier and obtain signal CI;
Step 2 is modulated to the pseudo-random sequence Q of quadrature component and navigation data Q with needs and adds by mould two and form a sequence, and carries out mould two additions with the quadrature component of subcarrier and obtain signal CQ;
Step 3 is carried out mould two additions with signal CI and CQ and is obtained signal CIQ;
Step 4 is carried out MSK or GMSK modulation to described signal CIQ, thereby is obtained base band in-phase branch signal and base band quadrature branch signal.
7. method according to claim 6 is characterized in that, described needs are modulated to the pseudo-random sequence I of in-phase component and the sequence of navigation data I for being made up of two numerical value: form by 0 and 1, perhaps form by 1 and-1; The speed of described sequence is fcode bps, and initial phase is the zeta degree.
8. method according to claim 6 is characterized in that, pseudo-random sequence Q and navigation data Q that described needs are modulated to quadrature component are by 0 or 1 sequence of forming; The speed of described sequence is fcode bps, and phase place is the zeta+90 degree.
9. method according to claim 6 is characterized in that, the in-phase component I of described subcarrier is square wave, and frequency is fcode/2Hz, and initial phase is the zeta degree; The quadrature component Q of described subcarrier is square wave, and frequency is fcode/2Hz, and first phase is the zeta+180 degree.
10. method according to claim 6 is characterized in that, described pseudo-random sequence I and navigation data be I's and sequence, satisfies the phase relations that differ 90 degree with pseudo-random sequence Q and generation clock navigation data Q and sequence; The generation clock of described subcarrier I and subcarrier Q satisfies the phase relation that differs 180 degree.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539567A (en) * | 2014-12-23 | 2015-04-22 | 电子科技大学 | 1090ES signal expansion method based on phase modulation |
| CN106908757A (en) * | 2017-03-03 | 2017-06-30 | 北京航空航天大学 | A kind of method that single system realizes indoor and outdoor continuous precise positioning on a large scale |
| CN107422301A (en) * | 2017-06-27 | 2017-12-01 | 北京航空航天大学 | A kind of big region high-precision locating method of alternative conventional wireless electricity navigation system |
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| CN1429427A (en) * | 2000-03-08 | 2003-07-09 | 高通股份有限公司 | Method and apparatus for computing soft decision input metrics to TURBO decoder |
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| US6160858A (en) * | 1997-08-04 | 2000-12-12 | Starlink, Inc. | MSK signal processing in a GPS correlator channel |
| US6201451B1 (en) * | 1998-12-18 | 2001-03-13 | Ucom Incorporated | MSK modulator and MSK modulation method of transmitting data at high speed and digital signal generator suitable for MSK modulation |
| US7120198B1 (en) * | 1999-05-26 | 2006-10-10 | The Aerospace Corporation | Quadrature product subcarrier modulation system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539567A (en) * | 2014-12-23 | 2015-04-22 | 电子科技大学 | 1090ES signal expansion method based on phase modulation |
| CN104539567B (en) * | 2014-12-23 | 2017-10-17 | 电子科技大学 | A kind of 1090ES signal expansion methods based on phase-modulation |
| CN106908757A (en) * | 2017-03-03 | 2017-06-30 | 北京航空航天大学 | A kind of method that single system realizes indoor and outdoor continuous precise positioning on a large scale |
| CN107422301A (en) * | 2017-06-27 | 2017-12-01 | 北京航空航天大学 | A kind of big region high-precision locating method of alternative conventional wireless electricity navigation system |
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Application publication date: 20130710 |