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KR20160116758A - Method for generating an unambiguous correlation function for tracking the AltBOC signal - Google Patents

Method for generating an unambiguous correlation function for tracking the AltBOC signal Download PDF

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Publication number
KR20160116758A
KR20160116758A KR1020150044964A KR20150044964A KR20160116758A KR 20160116758 A KR20160116758 A KR 20160116758A KR 1020150044964 A KR1020150044964 A KR 1020150044964A KR 20150044964 A KR20150044964 A KR 20150044964A KR 20160116758 A KR20160116758 A KR 20160116758A
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KR
South Korea
Prior art keywords
altboc
correlation function
signal
partial
present
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KR1020150044964A
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Korean (ko)
Inventor
이성로
윤석호
정민아
김진우
이승범
조성수
김범무
백종상
정환종
최상길
양진호
이혜진
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목포대학교산학협력단
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Priority to KR1020150044964A priority Critical patent/KR20160116758A/en
Publication of KR20160116758A publication Critical patent/KR20160116758A/en

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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
    • 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
    • G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/08—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing integrity information, e.g. health of satellites or quality of ephemeris data
    • 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
    • G01S19/20—Integrity monitoring, fault detection or fault isolation of space segment

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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)
  • Computer Security & Cryptography (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

The present invention relates to a method for generating an unambiguous correlation function for tracking an AltBOC signal. The method for generating an unambiguous correlation function according to the embodiment of the present invention includes a step of receiving alternative binary offset carrier (AltBOC) signal through a GPS receiver, a step of reinterpreting the subcarrier of the AltBOC signal with the sum of partial subcarriers, a step of obtaining a plurality of partial correlation functions by correlating the partial subcarriers with the AltBOC signal, and a step of generating an unambiguous correlation function by recombining the plurality of partial correlation functions. So, AltBOC signal tracing performance can be improved.

Description

Non-ambiguity for tracking the AltBOC signal. [0001] The present invention relates to a method for generating a correlation function,

The present invention relates to a satellite navigation system, and more particularly, to a method for generating a non-ambiguous correlation function for tracking an Alternative Binary Offset Carrier (AltBOC) signal.

 The Global Navigation Satellite System (GNSS) was originally developed for military purposes, but has since provided positioning information for civilian users. Recently, as demand and utilization of satellite navigation systems have increased, new satellite navigation systems such as Galileo systems and modernized positioning systems (GPS) (modernized GPS) have been developed.

In this new satellite navigation system, Binary Offset Carrier (BOC) modulation method, which has higher positioning accuracy than PSK (Phase Shift Keying) modulation method used in conventional GPS, is used among various signals. In particular, AltBOC (Alternative BOC) signals among BOC signals can be applied to COMPASS B2ab and Galileo E5ab signals among several GNSSs.

  Accurate signal synchronization in a satellite navigation system is the most important factor in implementing a reliable satellite navigation system. In satellite navigation systems, time synchronization is very important to obtain the correct pseudo-range.

However, there are many side-peaks in the autocorrelation function of the AltBOC signal, which causes ambiguity problems in which the signal is tracked at the peripheral peak rather than the main-peak, which is the correct tracking point in the signal tracking process (ambiguity problem) may occur. Since this ambiguity problem can cause pseudorange distance estimation errors, various techniques have been developed to solve this problem. In other words, a novel invention is needed to reduce the error of signal tracking by using correlation function with ambiguity removed for signal tracking.

It is an object of the present invention to provide a method of generating a non-ambiguous correlation function capable of adjusting a width of an AltBOC signal in order to improve the performance of tracking an AltBOC signal.

According to an aspect of the present invention, there is provided a method for generating a non-ambiguous correlation function for tracking an AltBOC signal, the method including receiving an Alternative Binary Offset Carrier (AltBOC) signal through a satellite navigation receiver, Re-analyzing the partial subcarrier with a sum of a plurality of partial subcarriers, correlating the partial subcarriers with the AltBOC signal to obtain a plurality of partial correlation functions, and recombining the plurality of partial correlation functions to generate a non- .

The partial subcarriers are equal to 8r subcarriers of the AltBOC signal.

According to an embodiment of the present invention, a sub-carrier pulse of an AltBOC signal is divided into a plurality of rectangular pulses, a correlation function is obtained using divided spherical pulses, a non-ambiguous correlation function is generated by recombining the obtained correlation function, , The correlation function of the present invention provides better TESD performance than existing AltBOC autocorrelation functions. It is also expected that the COMPASS B2ab and Galileo E5ab signals of the next generation GNSS will provide more accurate positioning accuracy through the present invention.

That is, according to the embodiment of the present invention, not only the peripheral peaks existing in the autocorrelation function of the AltBOC signal but also the sharpness and the high height can be generated to enhance the signal tracking performance.

1 is a flowchart illustrating a method of generating a non-ambiguous correlation function for tracking an AltBOC signal according to an embodiment of the present invention.
2 is a diagram illustrating subcarriers and partial subcarriers of an AltBOC signal according to an embodiment of the present invention.
FIG. 3 illustrates a process of generating a non-ambiguous correlation function according to an embodiment of the present invention. FIG.
4 is a graph illustrating a normalized AltBOC autocorrelation function and a normalized correlation function according to an embodiment of the present invention.
Figure 5 compares the TESD performance of the correlation function according to the embodiment of the present invention with the AltBOC autocorrelation function according to the CNR value for the AltBOC signal.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined by the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that " comprises, " or "comprising," as used herein, means the presence or absence of one or more other components, steps, operations, and / Do not exclude the addition.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are given to the same or similar components, and in the following description of the present invention, Detailed explanations of the detailed description will be omitted when the gist of the present invention can be obscured.

The present invention relates to a technique for generating a non-ambiguous correlation function for improving AltBOC (Alternative Binary Offset Carrier) signal tracking performance. Particularly, in the method of generating a non-ambiguous correlation function for tracking an AltBOC signal according to an embodiment of the present invention, a sub-carrier is re-analyzed as a plurality of rectangular pulses for an AltBOC signal, a partial correlation function is generated based on the sub- The present invention relates to a method of providing a correlation function having a higher height as well as removing a peripheral peak of an existing AltBOC autocorrelation function.

1 is a flowchart illustrating a method of generating a non-ambiguous correlation function for tracking an AltBOC signal according to an embodiment of the present invention.

Hereinafter, a method for generating a non-ambiguous correlation function for tracking an AltBOC signal according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5. FIG.

FIG. 2 is a diagram illustrating subcarriers and partial subcarriers of an AltBOC signal according to an embodiment of the present invention. FIG. 3 illustrates a process of generating a non-ambiguous correlation function according to an embodiment of the present invention. 4 is a graph showing a normalized AltBOC autocorrelation function and a normalized correlation function according to an embodiment of the present invention. FIG. 5 is a graph showing the relationship between the AltBOC autocorrelation function according to the CNR value for the AltBOC signal and the embodiment of the present invention And the TESD performance of the correlation function according to the present invention.

First, the phase navigation receiver receives the AltBOC signal (S110). Here, the AltBOC signal g (t) received at the receiver of the global navigation satellite system (GNSS) can be expressed by Equation (1).

Figure pat00001

Where P is the signal power, ceil (·) is the function of raising the factor, and mod (a, b) is the remainder of a / b.

Figure pat00002
Denotes the value of a subcarrier of the AltBOC signal,
Figure pat00003
The value of x is 0, 1, 2, 3, ... , And 7, respectively
Figure pat00004
Lt; / RTI >
Figure pat00005
The
Figure pat00006
Quot; refers to a unit square wave existing in the "
Figure pat00007
A chip period of a pseudorandom noise (PRN)
Figure pat00008
Denotes the value of the i-th pseudo noise code.

The subcarrier of the received AltBOC signal is reinterpreted as a sum of 8r partial subcarriers having a uniform width in step S110 (S120). The subcarrier of the AltBOC signal may be as shown in FIG. 2 and may be expressed by Equation (2).

Figure pat00009

Specifically, equation (2)

Figure pat00010
, S (t) is interpreted as 8r uniform partial subcarriers. FIG. 2 shows an example of partial subcarrier of an AltBOC signal when r = 2,
Figure pat00011
Lt; RTI ID = 0.0 > subcarriers < / RTI >

The partial subcarrier of the < RTI ID = 0.0 > AltBOC &

Figure pat00012
And a partial correlation function is obtained by correlating the received AltBOC signals in step S110 (S130).

The autocorrelation function of the normalized AltBOC signal using the partial subcarrier

Figure pat00013
Can be summarized as Equation (3). Here, T denotes the period of the pseudo noise code.

That is, the partial correlation function can be obtained from the partial subcarriers by correlating it with Equation (3).

Figure pat00014

here

Figure pat00015
Denotes a correlation between a partial subcarrier and a received signal,
Figure pat00016
Is defined as a partial correlation function. together,
Figure pat00017
Partial subcarriers
Figure pat00018
≪ / RTI >

Partial correlation function

Figure pat00019
And
Figure pat00020
Are symmetrical with respect to each other, and the product of the two functions is 0 or less except for the main peak portion. Hence, through the mathematical theorem of Equation (4), a correlation function with the surrounding peaks removed can be made.

Figure pat00021

By applying the principle of Equation (4), the correlation function

Figure pat00022
Lt; / RTI > Next, additional operations are performed to increase the height of the correlation function with the peripheral peaks removed. Correlation function with peripheral peaks removed
Figure pat00023
With the remaining partial correlation functions
Figure pat00024
, Which can be expressed by Equation (5) below.

Figure pat00025

Finally, as shown in Equation (6), all the generated correlation functions are added to generate a seedless non-ambiguous correlation function used for tracking the AltBOC signal (S140).

Figure pat00026

3 shows the final non-ambiguous correlation function

Figure pat00027
FIG. 4 shows a process of obtaining the normalized correlation function
Figure pat00028
And the normalized AltBOC autocorrelation function are shown together. The correlation function proposed in Fig. 4 completely removes the peripheral peak of the AltBOC autocorrelation function and has a peak and a higher peak than the AltBOC autocorrelation function.

The output of the discriminator for tracking the AltBOC signal

Figure pat00029
Can be expressed by Equation (7).

Figure pat00030

Here, Δ represents the interval after the beginning. The discriminator output is operated by a numerically controlled oscillator of a delay lock loop until τ becomes zero, keeping and keeping time synchronization.

Next, the tracking error standard deviation (TESD) performance of the correlation function of the present invention and the AltBOC autocorrelation function is compared through simulation. TESD

Figure pat00031
, Where < RTI ID = 0.0 >
Figure pat00032
Standard deviation,
Figure pat00033
The bandwidth of the loop filter,
Figure pat00034
Integral time, and
Figure pat00035
to be. The simulation
Figure pat00036
,
Figure pat00037
,
Figure pat00038
,
Figure pat00039
Lt; / RTI > The parameter r of the proposed scheme is assumed to be r = 2.

FIG. 5 shows TESD simulation performance for the case of using the correlation function of the present invention and the AltBOC autocorrelation function according to the carrier-to-noise ratio (CNR) for the AltBOC signal. Here, CNR

Figure pat00040
Lt; / RTI >
Figure pat00041
Is the noise power density. Simulation results show that the proposed technique shows better TESD performance than the conventional technique.

According to the embodiment of the present invention, a sub-carrier pulse of the AltBOC signal is divided into a plurality of rectangular pulses, a correlation function is obtained using divided spherical pulses, a non-ambiguous correlation function is generated by recombining the obtained correlation function, , The correlation function of the present invention provides better TESD performance than existing AltBOC autocorrelation functions. It is also expected that the COMPASS B2ab and Galileo E5ab signals of the next generation GNSS will provide more accurate positioning accuracy through the present invention.

That is, according to the embodiment of the present invention, not only the peripheral peaks existing in the autocorrelation function of the AltBOC signal but also the sharpness and the high height can be generated to enhance the signal tracking performance.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention may be embodied in other specific forms. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (2)

Receiving an Alternative Binary Offset Carrier (AltBOC) signal through a satellite navigation receiver;
Reinterpreting the subcarrier of the AltBOC signal as a sum of a plurality of partial subcarriers;
Correlating the plurality of partial subcarriers with the AltBOC signal to obtain a plurality of partial correlation functions; And
Generating a non-ambiguous correlation function by recombining the plurality of partial correlation functions;
A method for generating a non-ambiguous correlation function for tracking an AltBOC signal.
The apparatus of claim 1, wherein the partial sub-
The subcarriers of the AltBOC signal are divided equally into 8r
A method for generating a non - ambiguous correlation function for tracking an.
KR1020150044964A 2015-03-31 2015-03-31 Method for generating an unambiguous correlation function for tracking the AltBOC signal KR20160116758A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180061625A (en) * 2016-11-30 2018-06-08 성균관대학교산학협력단 TRACKING METHOD FOR AltBOC(15,10) SIGNAL AND TRACKING APPARATUS FOR AltBOC(15,10) SIGNAL
KR20180137808A (en) * 2017-06-19 2018-12-28 성균관대학교산학협력단 Method And Device For AltBOC Signal Processing
KR20190092164A (en) * 2018-01-30 2019-08-07 성균관대학교산학협력단 Method of generating an unambiguous correlation function for AltBOC signals
KR20190129358A (en) * 2018-05-10 2019-11-20 성균관대학교산학협력단 Method for tracking alternative binary offset carrier signal and apparatus therefor
KR20200017803A (en) * 2018-08-09 2020-02-19 성균관대학교산학협력단 A method for Generating an Unambiguous Correlation Function
KR102203894B1 (en) 2019-09-03 2021-01-15 성균관대학교산학협력단 An apparatus of generating unambiguous BOC correlation function based on tracking error estimation and a signal tracking apparatus using the apparatus
KR102266464B1 (en) * 2020-01-30 2021-06-17 성균관대학교산학협력단 A method and Apparatus for Generating an Unambiguous Correlation Function based on a Sub-Carrier Division

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180061625A (en) * 2016-11-30 2018-06-08 성균관대학교산학협력단 TRACKING METHOD FOR AltBOC(15,10) SIGNAL AND TRACKING APPARATUS FOR AltBOC(15,10) SIGNAL
KR101869223B1 (en) * 2016-11-30 2018-06-19 성균관대학교산학협력단 TRACKING METHOD FOR AltBOC(15,10) SIGNAL AND TRACKING APPARATUS FOR AltBOC(15,10) SIGNAL
KR20180137808A (en) * 2017-06-19 2018-12-28 성균관대학교산학협력단 Method And Device For AltBOC Signal Processing
KR20190092164A (en) * 2018-01-30 2019-08-07 성균관대학교산학협력단 Method of generating an unambiguous correlation function for AltBOC signals
KR20190129358A (en) * 2018-05-10 2019-11-20 성균관대학교산학협력단 Method for tracking alternative binary offset carrier signal and apparatus therefor
KR20200017803A (en) * 2018-08-09 2020-02-19 성균관대학교산학협력단 A method for Generating an Unambiguous Correlation Function
KR102203894B1 (en) 2019-09-03 2021-01-15 성균관대학교산학협력단 An apparatus of generating unambiguous BOC correlation function based on tracking error estimation and a signal tracking apparatus using the apparatus
KR102266464B1 (en) * 2020-01-30 2021-06-17 성균관대학교산학협력단 A method and Apparatus for Generating an Unambiguous Correlation Function based on a Sub-Carrier Division

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