CN104880716B - Nothing applied to BOC (n, n) signal obscures anti-multipath method - Google Patents
Nothing applied to BOC (n, n) signal obscures anti-multipath method Download PDFInfo
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- CN104880716B CN104880716B CN201510298089.9A CN201510298089A CN104880716B CN 104880716 B CN104880716 B CN 104880716B CN 201510298089 A CN201510298089 A CN 201510298089A CN 104880716 B CN104880716 B CN 104880716B
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- 230000001186 cumulative effect Effects 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
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Classifications
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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
- G01S19/22—Multipath-related issues
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The present invention discloses a kind of nothing applied to BOC (n, n) signal and obscures anti-multipath method of reseptance, comprises the following steps：By the satellite navigation signals received are phase-rotated and branch, respectively obtainz i (t) andz q (t), local replica signal is generated according to pseudo-code phase informationX(t),X(t) respectively withz i (t) andz q (t) related, cumulative, obtainI P WithQ P ；Reference waveform signal is generated according to pseudo-code phase informationW(t),W(t) basic waveform signal by 4 generally rectangular wave components, preceding 3 generally rectangular wave amplitudes are 1, and width is Δ1, there is a width between preceding 2 generally rectangular ripples is Δ2Interval, the 4th generally rectangular wave width is Δ3, amplitude is Δ1/Δ3。W(t) respectively withz i (t) andz q (t) related, cumulative, obtainI W WithQ W ；S3：According to what is obtained in step S2I P 、Q P 、I W 、Q W , pass through formulad(ε)=I P (ε)I W (ε) + Q P (ε)Q W (ε) obtains pseudo-code phase demodulation function；S4：Circulation carries out step S2 to S3, realizes the tracking process of BOC (n, n) signal pseudo-code.The method of the present invention can effectively eliminate the wrong lock point of pseudo-code phase demodulation function.
Description
Technical field
The present invention relates to technical field of satellite navigation, more particularly to one kind of satellite navigation receiver is applied to BOC (n, n)
The nothing of signal obscures anti-multipath method of reseptance.
Background technology
Multipath is that satellite direct signal is caused by the receiver antenna that is reflected into of surrounding objects, due to being difficult to pass through
Founding mathematical models, poor grading mode are eliminated, and multipath has turned into one of main error source that current satellite navigation system is positioned.Pass
The bpsk signal receiver of system typically closes reference waveform technology to eliminate multipath error using code-phase.Code-phase closes reference waveform technology
Ideal pseudo-code phase demodulation function, traditional reference waveform bag are constructed by being locally generated a series of reference waveform
Include W2 waveforms, W3 waveforms, W4 waveforms etc..BOC modulation systems in satellite navigation system are that GPS is modernized, Galileo satellite is led
A kind of signal modulation mode that boat system and Beidou satellite navigation system are used.Code-phase pass reference waveform technology uses traditional
There is wrong lock point when reference waveform receives BOC (n, n) signal, in pseudo-code phase demodulation function, cause to be locked to by mistake during tracking
Secondary lobe, makes positioning deviation occur, directly affects the positioning performance of satellite navigation receiver.In addition, its anti-multipath performance with it is optimal
Pseudo-code phase demodulation function, which is compared, still larger gap.
The content of the invention
The purpose of the present invention is the deficiency for above-mentioned prior art, proposes that a kind of nothing for BOC (n, n) signal is obscured
Anti-multipath method.The present invention is using a kind of new reference waveform, and the mistake in pseudo-code phase demodulation function is eliminated locks point, solves code-phase pass
While the problem of tracking when reference waveform technology is applied to BOC (n, n) signal is obscured, the anti-of receiver is further improved
Multipath performance.
The technical scheme is that：
One kind obscures anti-multipath method applied to the nothing of BOC (n, n) signal, comprises the following steps：
S1：By the satellite navigation signals received are phase-rotated and branch, the orthogonal signal of two-way is respectively obtainedz i (t)
Withz q (t)；
S2：Local replica signal is generated according to pseudo-code phase informationX(t),X(t) respectively withz i (t) andz q (t) related, tired
Plus, obtainI P WithQ P , its calculation formula is：
Wherein T is integration accumulation interval（Similarly hereinafter）, ε is time delay（Similarly hereinafter）；
Reference signal is generated according to pseudo-code phase informationW(t)。W(t) basic waveformg(t) by 4 generally rectangular ripple groups
Into preceding 3 generally rectangular wave amplitudes are 1, and width is Δ1, as shown in Figure 2, there is one between preceding 2 generally rectangular ripples
Individual width is Δ2Interval, the 4th generally rectangular wave width is Δ3, amplitude is-Δ1/Δ3。W(t) respectively withz i (t) andz q
(t) related, cumulative, obtainI W WithQ W , its calculation formula is：
；
S3：According to what is obtained in step S2I P 、Q P 、I W 、Q W , pseudo-code phase demodulation function, calculation formula are obtained by below equation
For：
d(ε) = I P (ε)I W (ε) + Q P (ε)Q W (ε)；
S4：Circulation carries out step S2 to S3, realizes the tracking process of BOC (n, n) signal pseudo-code.
As a further improvement on the present invention, in step S2, the pseudo-code phase information is obtained by code phase discriminator.
As a further improvement on the present invention, in step S2, the local replica signal generates mould by local replica signal
Root tuber is generated according to pseudo-code phase information.
As a further improvement on the present invention, in step S2, the reference waveform signalW(t) mould is generated by reference waveform
Root tuber according to pseudo-code phase information generate, constitute reference waveform 4 generally rectangular wave widths it is adjustable, preceding 2 generally rectangular ripples it
Between interval it is adjustable.
As a further improvement on the present invention, in step S2, T value is adjustable, and typical value is 1ms.
Compared with prior art, the advantageous effect of present invention is that：
By the present invention in that with a kind of new reference waveform signal, constructing the pseudo-code phase demodulation function that point is locked without mistake, energy
The tracking that enough effective blanking code coherent reference waveform technologies are existed when tracking BOC (n, n) signal using traditional reference waveform
The problem of fuzziness, and anti-multipath performance has further lifting.The anti-multipath performance of the present invention is better than W2 waveforms and traditional
Narrow relevant reception methods.
Brief description of the drawings
Fig. 1 is the theory diagram of the inventive method.Same phase that the signal of reception is generated with local carrier NCO modules and anti-phase
Carrier signal be multiplied, obtain peel off carrier wave after baseband signal, baseband signal respectively with local replica signal and local reference wave
Shape signal carries out related, integration, added up, and obtained result delivers to pseudo- code phase discriminator and carrier phase discriminator.Pseudo- code phase discriminator
Pseudo-code phase and carrier phase are calculated according to the accumulation result of input with carrier phase discriminator.Local carrier NCO modules according to
Carrier phase generates new carrier signal, is peeled off for carrier wave.Local replica signal maker is generated newly according to pseudo-code phase
Local replica signal, reference waveform maker generates new reference waveform signal according to pseudo-code phase.
Fig. 2 is the basic composition waveform graph of reference waveform signal proposed by the present invention.Basic waveform signal is basic by 4
Rectangle wave component, preceding 3 generally rectangular wave amplitudes are 1, and width is Δ1, exist between preceding 2 generally rectangular ripples one wide
Spend for Δ2Interval, the 4th generally rectangular wave width is Δ3, amplitude is-Δ1/Δ3。
Fig. 3 is the reference waveform schematic diagram generated according to one section of spreading code.
During Fig. 4 is BOC (1,1) signal, Δ of the present invention1For 1/8 chip width, Δ2For 3/8 chip width, Δ1/
Δ3=2, when front end bandwidth is 16.368MHz, pseudo-code phase demodulation functional digraph of the invention.
During Fig. 5 is BOC (1,1) signal, Δ of the present invention1For 1/8 chip width, Δ2For 3/8 chip width, Δ1/
Δ3The generally rectangular wave width of=2, W2 waveform is 1/8 chip width, narrow related morning-use 1/4 chip width late, preceding
Hold multipath error envelope comparison diagram during with a width of 16.368MHz.
Embodiment
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing, but is not construed as limiting the invention.
As shown in Figures 1 to 5, the nothing applied to BOC (n, n) signal of the present embodiment obscures anti-multipath method of reseptance, bag
Include following steps：
Step S1：By the satellite navigation signals of reception are phase-rotated and branch, the orthogonal signal of two-way is respectively obtainedz i
(t) andz q (t)；
Step S2：The pseudo-code phase information that local replica signal maker is obtained according to pseudo- code phase discriminator generate spreading code and
Subcarrier, the two modulation after-cost ground BOC signal, i.e.,X(t),X(t) respectively withz i (t) andz q (t) related, cumulative, obtainI P
WithQ P , calculation formula is
Wherein T numerical value is typically chosen for 1ms；
The pseudo-code phase information that local reference waveform generation module is obtained according to pseudo- code phase discriminator generates reference waveform signalW
(t),W(t) respectively withz i (t) andz q (t) related, cumulative, obtainI W WithQ W , calculation formula is
；
Step S3：According in step S2I P 、Q P 、I W 、Q W Pseudo-code phase demodulation function is obtained, calculation formula is：
d(ε) = I P (ε)I W (ε) + Q P (ε)Q W (ε)
Circulation carries out step S2 and step S3, realizes the tracking process of BOC (n, n) signal.
Although the above is the complete description to specific embodiments of the present invention, can take it is various modification, variant and
Alternative.These equivalents and alternative are included within the scope of the disclosure.Therefore, the scope of the present invention should not
Described embodiment is limited to, but should be defined by the appended claims.
Claims (5)
1. one kind obscures anti-multipath method of reseptance applied to the nothing of BOC (n, n) signal, it is characterised in that comprise the following steps：
S1：By the satellite navigation signals received are phase-rotated and branch, the orthogonal signal z of two-way is respectively obtainediAnd z (t)q
(t)；
S2：According to pseudo-code phase information generate local replica signal X (t), X (t) respectively with ziAnd z (t)q(t) it is related, cumulative, obtain
To IPAnd QP, its calculation formula is：
<mrow>
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Wherein T is integration accumulation interval, and ε is time delay；
According to pseudo-code phase information generate reference signal W (t), W (t) respectively with ziAnd z (t)q(t) it is related, cumulative, obtain IWWith
QW, its calculation formula is：
<mrow>
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W (t) basic waveform g (t) is by 4 generally rectangular wave components, and preceding 3 generally rectangular wave amplitudes are 1, and width is
Δ1, there is a width between preceding 2 generally rectangular ripples is Δ2Interval, the 4th generally rectangular wave width is Δ3, amplitude
For-Δ1/Δ3；
S3：According to the I obtained in step S2P、QP、IW、QW, pseudo-code phase demodulation function is obtained by below equation, calculation formula is：
D (ε)=IP(ε)IW(ε)+QP(ε)QW(ε)；
S4：Circulation carries out step S2 to S3, realizes the tracking process of BOC (n, n) signal pseudo-code.
2. the nothing according to claim 1 applied to BOC (n, n) signal obscures anti-multipath method of reseptance, it is characterised in that
In step s 2, the pseudo-code phase information is obtained by code phase discriminator.
3. the nothing according to claim 1 or 2 applied to BOC (n, n) signal obscures anti-multipath method of reseptance, its feature exists
In in step S2, the local replica signal is generated by local replica signal generation module according to pseudo-code phase information.
4. the nothing according to claim 3 applied to BOC (n, n) signal obscures anti-multipath method of reseptance, it is characterised in that
In step S2, the reference signal W (t) is generated by reference waveform generation module according to pseudo-code phase information.
5. the nothing according to claim 1 or 2 applied to BOC (n, n) signal obscures anti-multipath method of reseptance, its feature exists
In in step S2, T values are 1ms.
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Inventor after: Huang Long Inventor after: Liu Zhe Inventor after: Li Zhengrong Inventor after: Xiao Zhibin Inventor after: Gong Hang Inventor after: Tang Xiaomei Inventor after: Li Pengpeng Inventor after: Ni Shaojie Inventor after: Peng Jing Inventor before: Liu Zhe |
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