CN106547004A - The controllable secondary lobe binary offset carrier modulator approach of satellite navigation system signals - Google Patents

The controllable secondary lobe binary offset carrier modulator approach of satellite navigation system signals Download PDF

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Publication number
CN106547004A
CN106547004A CN201610979406.8A CN201610979406A CN106547004A CN 106547004 A CN106547004 A CN 106547004A CN 201610979406 A CN201610979406 A CN 201610979406A CN 106547004 A CN106547004 A CN 106547004A
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China
Prior art keywords
binary offset
secondary lobe
offset carrier
controllable
signal
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CN201610979406.8A
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胡媛
刘卫
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Shanghai Maritime University
Shanghai Ocean University
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Shanghai Maritime University
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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
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/29—Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
    • 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
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related

Abstract

The invention discloses a kind of controllable secondary lobe binary offset carrier modulator approach of satellite navigation system signals, on the basis of binary offset carrier modulation, it transform the rectangular pulse waveform of traditional binary offset carrier as stairstepping impulse waveform, each impulse waveform unit is determined by controllable parameter and range parameter, so as to the power for realizing the specific secondary lobe of signal is reduced, frequency spectrum between promotion signal is separated and compatible performance, the code tracking performance that can keep signal good again, anti-multipath and interference free performance.

Description

The controllable secondary lobe binary offset carrier modulator approach of satellite navigation system signals
Technical field
The present invention relates to a kind of method of satellite navigation system technical field, specifically satellite navigation system signals Controllable secondary lobe binary offset carrier modulator approach.
Background technology
The navigation of the direct decision systems of quality of satellite navigation system signals modulating performance and positioning performance, signal modulation set Meter is one of key in Navigation Signal System Top-layer Design Method.Binary offset carrier modulates (Binary Offset Carrier, abbreviation BOC) it is a kind of new navigation signal modulation system (J.W.Betz, Binary Offset Carrier Modulations for Radionavigation,NAVIGATION:Journal of The Institute of Navigation Vol.48, No.4, Winter 2001/02. " radionavigational binary offset carrier modulation "), pass through The parameter of rational selection signal, can lift correlated performance, code tracking and the anti-interference and anti-multipath energy of navigation system signal Power, particularly in the case where the fast development of the present satellites communication technology and signal kinds are various, can effectively realize navigation letter Number frequency spectrum separate and compatibility.By selecting different modulating parameter, realize that binary offset carrier modulation spectrum is different Secondary lobe separation degree, realizes various pilot signal power flexible allocation modulation.
Binary offset carrier modulation is applied in the satellite navigation systems such as GPS, Galileo and the Big Dipper at present, The signals such as such as GPS L1C, Galileo E1OS, E1PRS and Big Dipper B1C all adopt binary offset carrier modulation and its derivative tune Mode processed.Although binary offset carrier modulation is improved with by signal power is modulated on the both sides secondary lobe of carrier frequency The performance of signal, but with the construction of global every country and regional systems, lay in same center frequency point more and more Signal, easily there is signal spectrum overlap so that secondary lobe overlap caused by interference it is serious all the more, the new signal laid with Compatible hydraulic performance decline between existing navigation signal.For above-mentioned deficiency, the present invention proposes that a kind of controllable secondary lobe binary system is inclined Shifted carrier signal modulator approach, code tracking performance, anti-multipath and interference free performance that the modulation causes navigation signal holding good, together When can realize that the power of specific secondary lobe is reduced, frequency spectrum between promotion signal is separated and compatible performance.Therefore, based on controllable secondary lobe two System offset carrier is modulated, and building Navigation Signal System of good performance has important to the navigation of lift system and positioning performance Meaning.
The content of the invention
Present invention aims to the deficiencies in the prior art, there is provided a kind of to be adjusted based on binary offset carrier The satellite navigation system signals modulator approach of system, modulates (Controllable using controllable secondary lobe binary offset carrier Side-lobe Binary Offset Carrier, abbreviation CSBOC), keep good code tracking performance, anti-multipath and Interference free performance, while can realize that the power of specific secondary lobe is reduced, the frequency spectrum between promotion signal is separated and compatible performance.
What the present invention was achieved through the following technical solutions, the present invention will be passed on the basis of binary offset carrier modulation The rectangular pulse waveform of the binary offset carrier of system transform stairstepping impulse waveform as, and each impulse waveform unit is by controllable ginseng Number and range parameter determine that, so as to the power for realizing the specific secondary lobe of signal is reduced, the frequency spectrum between promotion signal is separated and compatibility Can, code tracking performance, anti-multipath and the interference free performance that can keep signal good again.
Step one：Design requirement and constraints first according to satellite navigation system, it is determined that spread spectrum code frequency fcOr week Phase Tc, it is determined that basic binary offset carrier modulation waveform BOC (fs,fc), wherein：fsFrequency for offset carrier (takes The integral multiple of 1.023MHz), fcTo spread code frequency (taking the integral multiple of 1.023MHz), its T reciprocalcFor the spreading code cycle；
Step 2：According to the design requirement and constraints of satellite navigation system, it is determined that the lower powered N levels of required drop Harmonic wave secondary lobe, controllable parameter Θ=[ρ1,ρ2,…,ρL] and range parameterConstruction quasi sine waveform, wherein：Controllable ginseng Several numbers L=(N+1)/2；
Step 3：Construct controllable secondary lobe binary offset carrier modulation waveformThe waveform is by base This binary offset carrier modulation waveform is constituted with quasi sine addition of waveforms in time domain.
Described controllable secondary lobe binary offset carrier modulation waveformPower spectral density be：
(when K is even number)；
(when K is odd number)；
Wherein, K is a spreading code cycle TcThe number of interior binary offset subcarrier, K=2fs/fc,
Step 4：According to controllable secondary lobe binary offset carrier modulation construction satellite navigation signalsWherein：A is signal amplitude, and D (t) is navigation message, and ω is signal carrier frequency Rate,For carrier phase, Sc (t) is controllable secondary lobe binary offset carrier modulation waveform
Step 5：To what is constructedSignal performance is tested, if signal spectral analysis Energy, power spectral density, code tracking precision and multipath perseverance envelope error is unsatisfactory for designed navigation system performance need and about Beam, return to step one reselect controllable parameter and range parameter.
Compared with prior art, controllable secondary lobe binary offset carrier modulator approach proposed by the present invention, it is suitable by selecting The parameter of conjunction, to realize existing good code tracking performance, anti-multipath and interference free performance, while specific secondary lobe can be realized Power is reduced, and the frequency spectrum between promotion signal is separated and compatible performance.
Description of the drawings
The controllable secondary lobe binary offset carriers of Fig. 1 modulate schematic diagram；
The controllable secondary lobe binary offset carriers of Fig. 2 modulate flow chart；
Fig. 3 adopts controllable three-level harmonic wave secondary lobe binary offset carrier modulation waveform structural map；
Fig. 4 modulates the baseband frequency spectrum figure of embodiment using controllable three-level harmonic wave secondary lobe；
Fig. 5 modulates the code tracking precision analysis figure of embodiment using controllable three-level harmonic wave secondary lobe；
Fig. 6 modulates the Multipath Errors analysis chart of embodiment using controllable three-level harmonic wave secondary lobe.
Specific embodiment
Below embodiments of the invention are elaborated, the present embodiment is carried out under premised on technical solution of the present invention Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following enforcements Example.
As Figure 1-3, performance requirement and constraint of the present embodiment first according to navigation system, it is determined that spread spectrum code frequency, Determine frequency f of offset carriers=1.023MHz, it is determined that the lower powered third level harmonic wave secondary lobe of drop, controllable parameter Θ=[ρ1, ρ2]=[1/3,1] and range parameterThen according to basic binary offset carrier modulation waveform in time domain with standard Controllable secondary lobe binary offset carrier modulation waveform CSBOC of sinusoidal waveform superimposed structure (1,1, [1/3], π/4), concrete steps are such as Under：
Step one：Design requirement and constraints first according to satellite navigation system, it is determined that spread spectrum code frequency fcOr week Phase Tc, it is determined that basic binary offset carrier modulation waveform BOC (fs,fc), wherein：fsFrequency for offset carrier (takes The integral multiple of 1.023MHz), fcTo spread code frequency (taking the integral multiple of 1.023MHz), its T reciprocalcFor the spreading code cycle；
Step 2：According to the design requirement and constraints of satellite navigation system, it is determined that the lower powered N levels of required drop Harmonic wave secondary lobe, controllable parameter Θ=[ρ1,ρ2,…,ρL] and range parameterConstruction quasi sine waveform, wherein：Controllable ginseng Several numbers L=(N+1)/2；
Step 3：Construct controllable secondary lobe binary offset carrier modulation waveformThe waveform is by base This binary offset carrier modulation waveform is constituted with quasi sine addition of waveforms in time domain.
Described controllable secondary lobe binary offset carrier modulation waveformPower spectral density be：
(when K is even number)；
(when K is odd number)；
Wherein, K is a spreading code cycle TcThe number of interior binary offset subcarrier, K=2fs/fc,
Step 4：According to controllable secondary lobe binary offset carrier modulation construction satellite navigation signalsWherein：A is signal amplitude, and D (t) is navigation message, and ω is signal carrier frequency Rate,For carrier phase, Sc (t) is controllable secondary lobe binary offset carrier modulation waveform
Step 5：To what is constructedSignal performance is tested, if signal spectral analysis Energy, power spectral density, code tracking precision and multipath perseverance envelope error is unsatisfactory for designed navigation system performance need and about Beam, return to step one reselect controllable parameter and range parameter.
As shown in figure 4, be given CSBOC (1,1, [1/3], π/4) and BOC (1, the 1) comparison of power spectral density, the horizontal stroke in figure Coordinate representation frequency, unit are Hz；Ordinate in figure is expressed as power spectral amplitude, unit dB.It can be seen that CSBOC (1,1, [1/3], π/4) can realize suppresses the power of high frequency secondary lobe, if illustrate the appropriate parameter of selection can flexible control signal frequency Spectrum is separated, so as to realize the compatibility between signal.
As shown in figure 5, give CSBOC (1,1, [1/3], π/4) and BOC (1,1) code tracking precision comparison, the horizontal stroke in figure The carrier-to-noise ratio of coordinate representation signal, unit are dB-Hz；Ordinate in figure is expressed as the code tracking error lower bound of signal, unit m.(1,1, [1/3], π/4) be modulated at are suitable with BOC (1,1) code tracking performance under different signal carrier-to-noise ratios for CSBOC.
As shown in fig. 6, give CSBOC (1,1, [1/3], π/4) and BOC (1,1) anti-multipath compare, the horizontal seat in figure Mark represents the multichannel electrical path length of signal, and unit is m；Ordinate in figure is expressed as the multipath perseverance envelope error of signal, unit m.CSBOC (1,1, [1/3], the modulation of π/4) can be realized and BOC (1, the 1) ability of anti-multipath being similar in multipath distance range is 110m-120m can realize more preferable anti-multipath ability.
Table 1 adopts controllable three-level harmonic wave secondary lobe spectrum modulation signal analytical performance, as follows：
Table 1
Spectral separation coefficient GPS P (Y) code GPS M codes Big Dipper B1AS Galileo E1PRS
BOC(1,1) -70.5581 -83.1594 -87.1265 -104.3785
CSBOC(1,1,[1/3,1],π/4) -70.4792 -83.8474 -87.1434 -105.1383
Table 1, give CSBOC (1,1, [1/3], π/4) and BOC (1,1) separate situation with the frequency spectrum of other signals. CSBOC (1,1, [1/3], the more preferable frequency spectrum of π/4) can realize with GPS M codes, Big Dipper B1 AS and Galileo E1 PRS separate and Compatible performance.

Claims (2)

1. the controllable secondary lobe binary offset carrier modulator approach of a kind of satellite navigation system signals, it is characterised in that include with Lower step：
Step one：Design requirement and constraints first according to satellite navigation system, it is determined that spread spectrum code frequency fcOr cycle Tc, It is determined that basic binary offset carrier modulation waveform BOC (fs,fc), wherein：fsFrequency for offset carrier (takes 1.023MHz Integral multiple), fcTo spread code frequency (taking the integral multiple of 1.023MHz), its T reciprocalcFor the spreading code cycle；
Step 2：According to the design requirement and constraints of satellite navigation system, it is determined that the lower powered N level harmonic waves of required drop Secondary lobe, controllable parameter Θ=[ρ1,ρ2,…,ρL] and range parameterConstruction quasi sine waveform, wherein：Controllable parameter Number L=(N+1)/2；
Step 3：Construct controllable secondary lobe binary offset carrier modulation waveformThe waveform is by basic Binary offset carrier modulation waveform is constituted with quasi sine addition of waveforms in time domain；
Described controllable secondary lobe binary offset carrier modulation waveformPower spectral density be：
Wherein, K is a spreading code cycle TcThe number of interior binary offset subcarrier, K=2fs/fc,
Step 4：According to controllable secondary lobe binary offset carrier modulation construction satellite navigation signalsWherein：A is signal amplitude, and D (t) is navigation message, and ω is signal carrier frequency Rate,For carrier phase, Sc (t) is controllable secondary lobe binary offset carrier modulation waveform
Step 5：To what is constructedSignal performance is tested, if signal spectral analysis performance, work( Rate spectrum density, code tracking precision and multipath perseverance envelope error is unsatisfactory for designed navigation system performance need and constraint, returns Return step one and reselect controllable parameter and range parameter.
2. the controllable secondary lobe binary offset carrier modulator approach of satellite navigation signals according to claim 1, its feature It is, described controllable secondary lobe binary offset carrier modulation waveformPower spectral density be：
Wherein, K is a spreading code cycle TcThe number of interior binary offset subcarrier, K=2fs/fc,
CN201610979406.8A 2016-11-08 2016-11-08 The controllable secondary lobe binary offset carrier modulator approach of satellite navigation system signals Pending CN106547004A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113608242A (en) * 2021-06-18 2021-11-05 西安空间无线电技术研究所 Navigation signal security enhancement method based on code period spread spectrum code authentication

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CN102426366A (en) * 2003-09-01 2012-04-25 国防部长 Modulation signals for a satellite navigation system
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113608242A (en) * 2021-06-18 2021-11-05 西安空间无线电技术研究所 Navigation signal security enhancement method based on code period spread spectrum code authentication
CN113608242B (en) * 2021-06-18 2023-08-11 西安空间无线电技术研究所 Navigation signal security enhancement method based on code period spread spectrum code authentication

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