CN104880716A - Unambiguous anti-multipath method for BOC (n, n) signals - Google Patents
Unambiguous anti-multipath method for BOC (n, n) signals Download PDFInfo
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- CN104880716A CN104880716A CN201510298089.9A CN201510298089A CN104880716A CN 104880716 A CN104880716 A CN 104880716A CN 201510298089 A CN201510298089 A CN 201510298089A CN 104880716 A CN104880716 A CN 104880716A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001186 cumulative effect Effects 0.000 claims description 7
- 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 description 2
- 230000002596 correlated effect Effects 0.000 abstract 2
- 230000010076 replication Effects 0.000 abstract 1
- 230000001427 coherent effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
Classifications
-
- 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 invention discloses an unambiguous anti-multipath receiving method for BOC (n, n) signals, comprising the following steps: a received satellite navigation signal is phase-rotated and split to obtain zi(t) and zq(t); a local replication signal X(t) is generated according to pseudo-code phase information, and X(t) is correlated with and added up to zi(t) and zq(t) respectively to obtain Ip and Qp; a reference waveform signal W(t) is generated according to the pseudo-code phase information, wherein the basic waveform signal of W(t) is composed of four basic rectangular waves, the amplitudes of the first three basic rectangular waves are 1 and the widths are delta1, an interval of which the width is delta2 exists between the first two basic rectangular waves, the width of the fourth basic rectangular wave is delta3, and the amplitude of the fourth basic rectangular wave is -delta1/delta3; W(t) is correlated with and added up to zi(t) and zq(t) respectively to obtain Iw and Qw; S3, a pseudo-code phase discrimination function is obtained through a formula d(epsilon)=Ip(epsilon)*Iw(epsilon)+Qp(epsilon)*Qw(epsilon) according to Ip, Qp, Iw and Qw obtained in S2; and S4, the steps S2 to S3 are repeated to realize BOC (n, n) signal pseudo code tracking. By adopting the method of the invention, error locking points of the pseudo-code phase discrimination function can be eliminated effectively.
Description
Technical field
The present invention relates to technical field of satellite navigation, particularly the one of satellite navigation receiver be applied to BOC (n, n) signal without fuzzy anti-multipath method of reseptance.
Background technology
To be satellite direct signal enter receiver antenna through the reflection of surrounding objects to multipath causes, and owing to being difficult to be eliminated by founding mathematical models, difference grading mode, multipath has become one of main error source of current satellite navigation system location.Traditional bpsk signal receiver generally adopts yard coherent reference waveform technology to eliminate multipath error.Code coherent reference waveform technology constructs ideal pseudo-code phase demodulation function by generating a series of reference waveform in this locality, and traditional reference waveform comprises W2 waveform, W3 waveform, W4 waveform etc.A kind of signal madulation mode that BOC modulation system in satellite navigation system is GPS modernization, Galileo satellite navigation system and Beidou satellite navigation system adopt.Code coherent reference waveform technology uses traditional reference waveform to receive BOC (n, n) during signal, in pseudo-code phase demodulation function, there is wrong lock point, cause to lock onto secondary lobe when following the tracks of by mistake, make location occur deviation, directly affect the positioning performance of satellite navigation receiver.In addition, its anti-multipath performance still has larger gap compared with optimum pseudo-code phase demodulation function.
Summary of the invention
The object of the invention is the deficiency for above-mentioned prior art, propose a kind of be used for BOC (n, n) signal without fuzzy anti-multipath method.The present invention adopts a kind of new reference waveform, eliminating, the mistake in pseudo-code phase demodulation function locks point, solution code coherent reference waveform technology is applied to BOC (n, n), while the problem that tracking during signal is fuzzy, the anti-multipath performance of receiver is further improved.
Technical scheme of the present invention is:
One be applied to BOC (n, n) signal without fuzzy anti-multipath method, comprise the following steps:
S1: the satellite navigation signals that receives along separate routes, is obtained the signal that two-way is orthogonal respectively through phase rotating
z i (
t) and
z q (
t);
S2: generate local replica signal according to pseudo-code phase information
x(
t),
x(
t) respectively with
z i (
t) and
z q (
t) relevant, cumulative, obtain
i p with
q p , its computing formula is:
Wherein T is integration accumulation interval (lower same), and ε is time delay (lower same);
According to pseudo-code phase information generating reference signal
w(
t).
w(
t) basic waveform
g(
t) be made up of 4 basic square waves, front 3 basic square wave amplitudes are 1, and width is Δ
1, as shown in Figure 2, there is a width between front 2 basic square waves is Δ
2interval, the 4th basic square wave width is Δ
3, amplitude is-Δ
1/ Δ
3.
w(
t) respectively with
z i (
t) and
z q (
t) relevant, cumulative, obtain
i w with
q w , its computing formula is:
；
S3: according to what obtain in step S2
i p ,
q p ,
i w ,
q w , obtain pseudo-code phase demodulation function by following formula, computing formula is:
d(ε) =
I P (ε)
I W (ε) +
Q P (ε)
Q W (ε)；
S4: step S2 to S3 is carried out in circulation, realizes the tracing process of BOC (n, n) signal pseudo-code.
As a further improvement on the present invention, in step S2, described pseudo-code phase information is obtained by code phase discriminator.
As a further improvement on the present invention, in step S2, described local replica signal is generated according to pseudo-code phase information by local replica signal generation module.
As a further improvement on the present invention, in step S2, described reference waveform signal
w(
t) generated according to pseudo-code phase information by reference waveform generation module, 4 basic square wave width-adjustable of composition reference waveform, the interval between front 2 basic square waves is adjustable.
As a further improvement on the present invention, in step S2, the value of T is adjustable, and typical value is 1ms.
Compared with prior art, the beneficial effect that the present invention has is:
The present invention is by using a kind of new reference waveform signal, construct the pseudo-code phase demodulation function not having mistake to lock point, effectively can follow the tracks of BOC (n by blanking code coherent reference waveform technology, the problem of the tracking blur level n) using traditional reference waveform to exist during signal, and anti-multipath performance has had further lifting.Anti-multipath performance of the present invention is better than W2 waveform and traditional narrow relevant reception methods.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the inventive method.The signal received is multiplied with phase inverted carrier signals with the homophase of local carrier NCO CMOS macro cell, obtain the baseband signal after peeling off carrier wave, baseband signal carries out relevant, integration, cumulative respectively to local replica signal and local reference waveform signal, the result obtained delivers to pseudo-code phase discriminator and carrier phase Discr..Pseudo-code phase discriminator and carrier phase Discr. calculate pseudo-code phase and carrier phase according to the accumulation result of input.Local carrier NCO module generates new carrier signal according to carrier phase, peels off for carrier wave.Local replica signal maker generates new local replica signal according to pseudo-code phase, and reference waveform maker generates new reference waveform signal according to pseudo-code phase.
Fig. 2 is the basic composition waveform graph of the reference waveform signal that the present invention proposes.Basic waveform signal is made up of 4 basic square waves, and front 3 basic square wave amplitudes are 1, and width is Δ
1, there is a width between front 2 basic square waves is Δ
2interval, the 4th basic square wave width is Δ
3, amplitude is-Δ
1/ Δ
3.
Fig. 3 is the reference waveform schematic diagram generated according to one section of spreading code.
Fig. 4 is in BOC (1,1) signal, Δ of the present invention
1be 1/8 chip width, Δ
2be 3/8 chip width, Δ
1/ Δ
3=2, when front end bandwidth is 16.368MHz, pseudo-code phase demodulation functional digraph of the present invention.
Fig. 5 is in BOC (1,1) signal, Δ of the present invention
1be 1/8 chip width, Δ
2be 3/8 chip width, Δ
1/ Δ
3the basic square wave width of=2, W2 waveform is 1/8 chip width, narrow relevant morning-adopt 1/4 chip width late, multipath error envelope comparison diagram when front end bandwidth is 16.368MHz.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail, but are not construed as limiting the invention.
As shown in Figures 1 to 5, the present embodiment be applied to BOC (n, n) signal without fuzzy anti-multipath method of reseptance, comprise the following steps:
Step S1: by the satellite navigation signals of reception through phase rotating also along separate routes, obtain the signal that two-way is orthogonal respectively
z i (
t) and
z q (
t);
Step S2: the pseudo-code phase information that local replica signal maker obtains according to pseudo-code phase discriminator generates spreading code and subcarrier, the two modulation after-cost ground BOC signal, namely
x(
t),
x(
t) respectively with
z i (
t) and
z q (
t) relevant, cumulative, obtain
i p with
q p , computing formula is
Wherein the numerical value of T is generally chosen for 1ms;
The pseudo-code phase information generating reference waveform signal that local reference waveform generation module obtains according to pseudo-code phase discriminator
w(
t),
w(
t) respectively with
z i (
t) and
z q (
t) relevant, cumulative, obtain
i w with
q w , computing formula is
；
Step S3: according in step S2
i p ,
q p ,
i w ,
q w obtain pseudo-code phase demodulation function, computing formula is:
d(ε) =
I P (ε)
I W (ε) +
Q P (ε)
Q W (ε)
Step S2 and step S3 is carried out in circulation, realizes the tracing process of BOC (n, n) signal.
Although the above is the complete description to specific embodiments of the present invention, various amendment, variant and alternative can be taked.These equivalents and alternative are included within the scope of the invention.Therefore, scope of the present invention should not be limited to described embodiment, but should be defined by the appended claims.
Claims (6)
1. be applied to BOC (n, n) signal without a fuzzy anti-multipath method of reseptance, it is characterized in that, comprise the following steps:
S1: the satellite navigation signals that receives along separate routes, is obtained the signal that two-way is orthogonal respectively through phase rotating
z i (
t) and
z q (
t);
S2: generate local replica signal according to pseudo-code phase information
x(
t),
x(
t) respectively with
z i (
t) and
z q (
t) relevant, cumulative, obtain
i p with
q p , its computing formula is:
Wherein T is integration accumulation interval (lower same), and ε is time delay (lower same);
According to pseudo-code phase information generating reference signal
w(
t),
w(
t) respectively with
z i (
t) and
z q (
t) relevant, cumulative, obtain
i w with
q w , its computing formula is:
；
S3: according to what obtain in step S2
i p ,
q p ,
i w ,
q w , obtain pseudo-code phase demodulation function by following formula, computing formula is:
d(ε) =
I P (ε)
I W (ε) +
Q P (ε)
Q W (ε)；
S4: step S2 to S3 is carried out in circulation, realizes the tracing process of BOC (n, n) signal pseudo-code.
2. according to claim 1 be applied to BOC (n, n) signal without fuzzy anti-multipath method of reseptance, it is characterized in that, in step s 2, described pseudo-code phase information is obtained by code phase discriminator.
3. according to claim 1 and 2 be applied to BOC (n, n) signal without fuzzy anti-multipath method of reseptance, it is characterized in that, in step S2, described local replica signal is generated according to pseudo-code phase information by local replica signal generation module.
4. according to claim 3 be applied to BOC (n, n) signal without fuzzy anti-multipath method of reseptance, it is characterized in that, in step S2, described reference signal
w(
t) generated according to pseudo-code phase information by reference waveform generation module.
5. according to claim 1 be applied to BOC (n, n) signal without fuzzy anti-multipath method of reseptance, it is characterized in that, in step S2,
w(
t) basic waveform
g(
t) be made up of 4 basic square waves, front 3 basic square wave amplitudes are 1, and width is Δ
1, there is a width between front 2 basic square waves is Δ
2interval, the 4th basic square wave width is Δ
3, amplitude is-Δ
1/ Δ
3.
6. according to claim 1 and 2 be applied to BOC (n, n) signal without fuzzy anti-multipath method of reseptance, it is characterized in that, in step S2, T value is adjustable, and typical value is 1ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510298089.9A CN104880716B (en) | 2015-06-04 | 2015-06-04 | Nothing applied to BOC (n, n) signal obscures anti-multipath method |
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|---|---|---|---|
| CN201510298089.9A CN104880716B (en) | 2015-06-04 | 2015-06-04 | Nothing applied to BOC (n, n) signal obscures anti-multipath method |
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| Publication Number | Publication Date |
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| CN104880716B CN104880716B (en) | 2017-08-25 |
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Cited By (1)
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| CN108345014A (en) * | 2017-12-29 | 2018-07-31 | 中国电子科技集团公司第二十研究所 | A kind of method of reseptance of orthogonal multiplex BOC modulated signals |
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| CN103675851A (en) * | 2013-12-19 | 2014-03-26 | 胡辉 | BOC(m, n) signal capture method based on separation and reconstruction of correlation function |
| EP2796896A1 (en) * | 2013-04-25 | 2014-10-29 | Astrium GmbH | Method and Device for Tracking Signals with at least one Subcarrier |
| CN104483683A (en) * | 2014-11-27 | 2015-04-01 | 重庆邮电大学 | High-dynamic BOC (binary offset carrier) spread spectrum signal carrier tracking method based on expanded-dimension SRUKF (square root unscented Kalman filter) |
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2015
- 2015-06-04 CN CN201510298089.9A patent/CN104880716B/en active Active
Patent Citations (3)
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| EP2796896A1 (en) * | 2013-04-25 | 2014-10-29 | Astrium GmbH | Method and Device for Tracking Signals with at least one Subcarrier |
| CN103675851A (en) * | 2013-12-19 | 2014-03-26 | 胡辉 | BOC(m, n) signal capture method based on separation and reconstruction of correlation function |
| CN104483683A (en) * | 2014-11-27 | 2015-04-01 | 重庆邮电大学 | High-dynamic BOC (binary offset carrier) spread spectrum signal carrier tracking method based on expanded-dimension SRUKF (square root unscented Kalman filter) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108345014A (en) * | 2017-12-29 | 2018-07-31 | 中国电子科技集团公司第二十研究所 | A kind of method of reseptance of orthogonal multiplex BOC modulated signals |
| CN108345014B (en) * | 2017-12-29 | 2021-09-07 | 中国电子科技集团公司第二十研究所 | Method for receiving orthogonal multiplexing BOC modulation signal |
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|---|---|
| CN104880716B (en) | 2017-08-25 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
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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Effective date of registration: 20160831 Address after: 410073 Hunan province Changsha Kaifu District, Deya Road No. 109 Applicant after: NATIONAL University OF DEFENSE TECHNOLOGY Address before: 410073 Hunan province Changsha Kaifu District, Deya Road No. 109 Applicant before: Liu Zhe |
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Effective date of registration: 20220718 Address after: 410000 block a, building 1, Changsha National Security Industrial Park, No. 699 Qingshan Road, Yuelu District, Changsha City, Hunan Province Patentee after: Hunan Institute of advanced technology Address before: 410073 Hunan province Changsha Kaifu District, Deya Road No. 109 Patentee before: National University of Defense Technology Effective date of registration: 20220718 Address after: 410073 Hunan province Changsha Kaifu District, Deya Road No. 109 Patentee after: National University of Defense Technology Address before: 410073 Hunan province Changsha Kaifu District, Deya Road No. 109 Patentee before: NATIONAL University OF DEFENSE TECHNOLOGY |
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Effective date of registration: 20221130 Address after: Building 4, Hunan Military civilian Integration Science and Technology Innovation Industrial Park, No. 699, Qingshan Road, Changsha Hi tech Development Zone, 410000, Hunan Patentee after: Hunan Zhongdian Xinghe Electronics Co.,Ltd. Address before: 410000 block a, building 1, Changsha National Security Industrial Park, No. 699 Qingshan Road, Yuelu District, Changsha City, Hunan Province Patentee before: Hunan Institute of advanced technology |