KR20160128023A - METHOD FOR GENERATING AN UNAMBIGUOUS CRRELATION FUNCTION FOR COSINE-PHASED BOC(kn,n) SIGNAL - Google Patents

METHOD FOR GENERATING AN UNAMBIGUOUS CRRELATION FUNCTION FOR COSINE-PHASED BOC(kn,n) SIGNAL Download PDF

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KR20160128023A
KR20160128023A KR1020150059732A KR20150059732A KR20160128023A KR 20160128023 A KR20160128023 A KR 20160128023A KR 1020150059732 A KR1020150059732 A KR 1020150059732A KR 20150059732 A KR20150059732 A KR 20150059732A KR 20160128023 A KR20160128023 A KR 20160128023A
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South Korea
Prior art keywords
signal
generating
correlation function
boc
cosine
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KR1020150059732A
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Korean (ko)
Inventor
이성로
정민아
윤석호
이승범
김범무
백종상
정환종
박진관
오주성
최상길
양진호
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목포대학교산학협력단
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Publication of KR20160128023A publication Critical patent/KR20160128023A/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

Disclosed is a method for generating an unambiguous correlation function suitable for a cosine-phased BOC (kn, n) signal. According to the present invention, the method for generating an unambiguous correlation function suitable for a cosine-phased BOC (kn, n) signal comprises a step of generating a correlation function which has no peripheral peak by recombining a sub correlation function obtained by generating a new local signal after receiving a cosine-phased BOC signal. According to the present invention, the more accurate positioning accuracy in a global positioning system (GPS) for transmitting positioning information by using the cosine-phased BOC signal can be provided.

Description

METHOD FOR GENERATING AN UNAMBIGUOUS CRRELATION FUNCTION FOR COSINE-PHASED BOC (kn, n) SIGNAL FOR COZYAN PHASE BOC (kn, n)

The present invention relates to a method of generating a non-ambiguous correlation function suitable for a cosine phase BOC (kn, n) signal, and more particularly to a method of generating a binary offset carrier (BOC) signal with a cosine phase using a new local signal And a peripheral peak removal technique for improving performance.

Global navigation satellite systems (GNSSs) are systems that provide accurate position, speed, etc. of the receiver using navigation satellites.

The satellite navigation system was first developed for the defense sector, but recently it has been used in various fields such as geodesy, surveying, logistics and agriculture in the private sector as well as the defense sector.

Recently, as the use of satellite navigation system has increased, the importance of satellite navigation system has increased and dependence on it has increased. For this reason, the new satellite navigation system is using more than one phase shift keying (PSK) BOC modulation schemes with higher positioning accuracy will be used.

In satellite navigation systems, accurate synchronization of signals is directly linked to reliability, so accurate synchronization is essential for accurate positioning. However, the disadvantage of the BOC signal is that autocorrelation of the signal has a large number of peripheral peaks, so that synchronization can be achieved at the peripheral peak rather than the main peak in the signal synchronization. This problem is called ambiguity problem, and solving this ambiguity problem is essential for accurate BOC signal tracing.

In particular, when the BOC signal is autocorrelated, there are several peripheral peaks in addition to the main peak in its autocorrelation function. These peripheral peaks cause ambiguity problems when tracking BOC signals, and these problems make it difficult to provide reliable positioning.

In order to solve the problems of the above-described conventional techniques, the present invention is directed to a method of designing a new local signal instead of a conventional local subcarrier for tracking a cosine phase BOC signal, correlating new local signals with the BOC signal, Generate a non-ambiguous correlation function for the cosine phase BOC (kn, n) signal that can improve the signal tracking performance by completely removing the surrounding peaks when compared with the autocorrelation function of the existing cosine phase BOC signal by generating the ambiguous correlation function And to provide the above objects.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a method of generating a non-ambiguous correlation function suitable for a cosine phase BOC (kn, n) signal, comprising: receiving a cosine phase BOC signal; And generating a correlation function in which the surrounding peaks do not exist by recombining the correlation functions.

Wherein the step of generating the correlation function comprises the steps of: (a)

Figure pat00001
Receiving a signal;

Figure pat00002

here

Figure pat00003
in
Figure pat00004
The sign of the third pulse,
Figure pat00005
The number of total pulses,
Figure pat00006
The period of the pulse,
Figure pat00007
in
Figure pat00008
Subcarrier pulse,
Figure pat00009
The
Figure pat00010
Means an integer that is not less than.

(b) generating a new local signal such as:

Figure pat00011

here

Figure pat00012
The
Figure pat00013
The value of (
Figure pat00014
) Means local signals,
Figure pat00015
The shape of the local signals is changed according to the value of.

(c)

Figure pat00016
,
Figure pat00017
,
Figure pat00018
,
Figure pat00019
And the cosine phase
Figure pat00020
The partial correlation obtained by correlating the signals
Figure pat00021
,
Figure pat00022
,
Figure pat00023
,
Figure pat00024
As shown in the following equation,
Figure pat00025
≪ / RTI >

Figure pat00026

Figure pat00027

(here

Figure pat00028
in
Figure pat00029
The third pulse,
Figure pat00030
The number of total pulses,
Figure pat00031
The period of the pulse,
Figure pat00032
in
Figure pat00033
Subcarrier pulse,
Figure pat00034
The
Figure pat00035
Non-smaller integers,
Figure pat00036
Is a real number greater than 0 and selectable by a user less than 1).

As described above, according to the present invention, after designing a new local signal, the designed local signal is correlated with the BOC signal to obtain a sub-correlation function, and a sub-correlation function is combined to obtain a non- And the like.

The present invention is expected to provide more accurate positioning accuracy in a satellite navigation system that transmits positioning information using a cosine phase BOC signal.

FIG. 1 illustrates a non-ambiguous correlation function generation method suitable for a cosine phase BOC (kn, n) signal according to an embodiment of the present invention.
2 shows a received signal and a newly designed local signal for a cosine phase BOC (kn, n) signal according to an embodiment of the present invention,
Figure 3 illustrates a correlation function according to an embodiment of the present invention;
FIG. 4 illustrates a process of generating a correlation function according to an embodiment of the present invention. FIG.
5 is a diagram for explaining a correlation function according to the CNR value and a TESD performance of the BOC COS (1, 1) autocorrelation function for the BOC COS (1, 1) signal in the embodiment of the present invention.

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. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of 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.

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 used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The BOC signal is generally divided into a sine phase BOC and a cosine phase BOC according to the subcarrier phase of the subcarrier. The sine phase BOC and the cosine phase BOC mean that the subcarriers have a sine phase and a cosine phase, respectively, and the sine phase BOC signal

Figure pat00037
, The cosine phase BOC signal is
Figure pat00038
. Where k is a positive integer representing the ratio of the pseudorandom noise (PRN) transmission rate to the subcarrier frequency, n is the ratio of the PRN code rate to 1.023 MHz, Means that a sub-carrier pulse exists.

Normally

Figure pat00039
signal
Figure pat00040
Can be expressed by Equation (1).

[Equation 1]

Figure pat00041

here

Figure pat00042
The signal power,
Figure pat00043
Is a cycle
Figure pat00044
Of the PRN code
Figure pat00045
Th chip,
Figure pat00046
A PRN code chip cycle,
Figure pat00047
Is [0,
Figure pat00048
] Of the unit square wave,
Figure pat00049
Represents the navigation data. Generally, the satellite navigation system provides a separate pilot channel for synchronization, and the pilot channel provides fast and accurate synchronization
Figure pat00050
Respectively. The present invention develops a correlation function used in a signal tracking technique that assumes a pilot channel.
Figure pat00051
The
Figure pat00052
And is expressed by Equation (2).

&Quot; (2) "

Figure pat00053

here

Figure pat00054
in
Figure pat00055
The sign of the third pulse,
Figure pat00056
The number of total pulses,
Figure pat00057
The period of the pulse,
Figure pat00058
in
Figure pat00059
Subcarrier pulse,
Figure pat00060
The
Figure pat00061
Means an integer that is not less than. In the present invention, the PRN code chip is assumed to be an independent random variable having probability distributions in which signs +1 and -1 are the same. The period of the PRN code
Figure pat00062
Is generally a PRN code chip cycle
Figure pat00063
Lt; / RTI >

To generate a correlation function without surrounding peaks, four new local signals are generated as shown in Equation (3).

&Quot; (3) "

Figure pat00064

here

Figure pat00065
The
Figure pat00066
The value of (
Figure pat00067
) Means local signals,
Figure pat00068
The shape of the local signals is changed according to the value of. 2,
Figure pat00069
Signals for the received signal and newly designed local signals.

Figure pat00070
The received signal
Figure pat00071
And the normalized partial correlation function using the new local signals are expressed by Equation (4).

&Quot; (4) "

Figure pat00072

here

Figure pat00073
The
Figure pat00074
Depending on the value
Figure pat00075
Th order correlation function,
Figure pat00076
The size of the correlation function is changed according to the value of the correlation function. E.g,
Figure pat00077
Wow
Figure pat00078
Is greater than 0 only at the peak of the peak, and if the two correlation functions are symmetrical to each other,
Figure pat00079
Wow
Figure pat00080
To
Figure pat00081
, It is possible to generate a non-ambiguous correlation function in which the surrounding peaks are completely removed. Through the results of the correlation function
Figure pat00082
Wow
Figure pat00083
, And
Figure pat00084
Wow
Figure pat00085
The two pairs of
Figure pat00086
Axially symmetric, and the products of each other have a positive value only in the main peak range and have a negative value in the range other than the main peak. Therefore, a new intermediate non-ambiguous correlation function .

&Quot; (5) "

Figure pat00087

The two intermediate non-ambiguous correlation functions

Figure pat00088
Wow
Figure pat00089
The final correlation function < RTI ID = 0.0 >
Figure pat00090
.

&Quot; (6) "

Figure pat00091

The correlation function proposed from FIG. 3

Figure pat00092
It can be confirmed that the peripheral peaks are completely removed when compared to the autocorrelation function of

FIG. 4 is a graph showing the final correlation function

Figure pat00093
Is generated.

The discriminator output for tracking the BOC signal code can be expressed as Equation (7).

&Quot; (7) "

Figure pat00094

here

Figure pat00095
Is the post-interval, and the discriminator output is controlled by a numerically controlled oscillator in a delay lock loop
Figure pat00096
Is zero.

The tracking error standard deviation (TESD) performance is compared by using the BOC auto correlation function and the correlation function of the present invention and the correlation function of the present invention. TESD

Figure pat00097
Lt; / RTI >
Figure pat00098
The
Figure pat00099
Standard deviation,
Figure pat00100
The bandwidth of the loop filter,
Figure pat00101
Integral time, and
Figure pat00102
to be. The simulation was carried out assuming the following parameters (
Figure pat00103
,
Figure pat00104
,
Figure pat00105
,
Figure pat00106
).

6,

Figure pat00107
Carrier-to-noise ratio (CNR)
Figure pat00108
And TESD performance for the case of using the correlation functions of the present invention. Here, CNR
Figure pat00109
Figure pat00110
Is defined as
Figure pat00111
Is the noise power density. From Figure 5, the correlation function of the present invention
Figure pat00112
(20dB ~ 40dB) than the autocorrelation function of the CNR range. This is because the ambiguity problem is completely solved in the proposed correlation function.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. 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 shall be construed as being included within the scope of the present invention.

Claims (2)

A method for generating a non-ambiguous correlation function of a cosine phase BOC signal,
Generating a correlation function having no peripheral peaks by recombining a sub-correlation function obtained by generating a new local signal after receiving a cosine phase BOC signal; and generating a correlation function having a cosine phase BOC (kn, n) A method for generating an ambiguous correlation function.
2. The method of claim 1, wherein generating the correlation function comprises:
(a) The cosine phase
Figure pat00113
Receiving a signal;
Figure pat00114

here
Figure pat00115
in
Figure pat00116
The sign of the third pulse,
Figure pat00117
The number of total pulses,
Figure pat00118
The period of the pulse,
Figure pat00119
in
Figure pat00120
Subcarrier pulse,
Figure pat00121
The
Figure pat00122
Means an integer that is not less than.
(b) generating a new local signal such as:

Figure pat00123

here
Figure pat00124
The
Figure pat00125
The value of (
Figure pat00126
) Means local signals,
Figure pat00127
The shape of the local signals is changed according to the value of.
(c)
Figure pat00128
,
Figure pat00129
,
Figure pat00130
,
Figure pat00131
And the cosine phase
Figure pat00132
The partial correlation obtained by correlating the signals
Figure pat00133
,
Figure pat00134
,
Figure pat00135
,
Figure pat00136
As shown in the following equation,
Figure pat00137
≪ / RTI >
Figure pat00138

Figure pat00139

(here
Figure pat00140
in
Figure pat00141
The third pulse,
Figure pat00142
The number of total pulses,
Figure pat00143
The period of the pulse,
Figure pat00144
in
Figure pat00145
Subcarrier pulse,
Figure pat00146
The
Figure pat00147
Non-smaller integers,
Figure pat00148
Is a real number greater than 0 and selectable by a user less than 1)
A method for generating a non-ambiguous correlation function suitable for an in cosine phase BOC (kn, n) signal.
KR1020150059732A 2015-04-28 2015-04-28 METHOD FOR GENERATING AN UNAMBIGUOUS CRRELATION FUNCTION FOR COSINE-PHASED BOC(kn,n) SIGNAL KR20160128023A (en)

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Cited By (2)

* 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
KR20200017803A (en) * 2018-08-09 2020-02-19 성균관대학교산학협력단 A method for Generating an Unambiguous Correlation Function

Cited By (3)

* 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
KR20200017803A (en) * 2018-08-09 2020-02-19 성균관대학교산학협력단 A method for Generating an Unambiguous Correlation Function

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