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KR20150056279A - A side-peak cancellation technique to improve tracking performance for sine-phased BOC(n,n) signal - Google Patents

A side-peak cancellation technique to improve tracking performance for sine-phased BOC(n,n) signal Download PDF

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Publication number
KR20150056279A
KR20150056279A KR1020130139074A KR20130139074A KR20150056279A KR 20150056279 A KR20150056279 A KR 20150056279A KR 1020130139074 A KR1020130139074 A KR 1020130139074A KR 20130139074 A KR20130139074 A KR 20130139074A KR 20150056279 A KR20150056279 A KR 20150056279A
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South Korea
Prior art keywords
signal
boc
sine
present
tracking performance
Prior art date
Application number
KR1020130139074A
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Korean (ko)
Inventor
이성로
김경호
채근홍
윤석호
주양로
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목포대학교산학협력단
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Publication of KR20150056279A publication Critical patent/KR20150056279A/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
    • G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code 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
    • G01S19/03—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
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system

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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 method includes receiving a sine phase BOC signal, interpreting the received BOC signal in a plurality of spherical pulse shapes, obtaining partial correlations from the analyzed plurality of spherical pulses, and combining the partial correlations To a sine-phase BOC (n, n) signal tracking performance enhancement method comprising generating two correlation functions symmetrically overlapping only around a peak.

Description

[0001] The present invention relates to a method and apparatus for improving the tracking performance of a sine-phase BOC (n, n) signal,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite navigation system, and more particularly to a technique for improving tracking performance of a binary offset carrier (BOC) signal.

The next-generation satellite navigation system (GNSS), which has been used for military purposes, provides positioning information for civilian users. Recently, to meet the increasing demand for more accurate positioning, Galileo and Modernization New satellite navigation systems such as global positioning system and modenized GPS are being developed. In this new satellite navigation system, a binary offset carrier (BOC) modulation scheme with higher positioning accuracy than the phase shift keying (PSK) modulation scheme used in conventional GPS will be used among various signals.

In satellite navigation system, time synchronization error is directly related to distance measurement error, so accurate signal synchronization is very important for realizing reliable satellite navigation system. However, because autocorrelation of the BOC signal has a number of peripheral peaks, the problem of signal tracking at the peripheral peaks rather than the main-peak in the signal synchronization (false lock) Lt; / RTI > In other words, ambiguity problems may occur in tracking BOC signals due to the surrounding peaks, which makes it difficult to provide reliable positioning.

In order to solve the ambiguity problem caused by the peripheral peaks, a method of directly removing the peripheral peaks of the BOC autocorrelation function is being studied. For example, the method of removing the existing peripheral peaks (prior inventions 1 and 2) can completely remove the peripheral peaks of the BOC autocorrelation function. However, existing methods require auxiliary signals to remove the peripheral peaks, which leads to increased hardware complexity. As another example, there is a peripheral peak removal method (prior art 3) that does not require ancillary signals while eliminating the surrounding peaks completely, but since the focus is only on removing the peripheral peaks, improvement in signal tracking performance is not considered Do not.

An object of the present invention is to provide a technical solution for improving tracking performance of a sine-phase BOC (n, n) signal most widely used among binary offset carrier (BOC) signals.

According to an aspect of the present invention, there is provided a method for removing a sine-phase BOC signal, the method comprising: receiving a sine-phase BOC signal; Interpolating in the form of a spherical pulse, obtaining partial correlations from the interpreted plurality of spherical pulses, and combining the partial correlations to produce two correlation functions that are symmetric only in the vicinity of the main peak.

Also, the method of removing peripheral peaks for improving the sine phase BOC (n, n) signal tracking performance further includes generating a non-ambiguous correlation function by removing the peripheral peaks by combining the generated two correlation functions.

The present invention divides subcarrier pulses of a sinusoidal phase BOC (n, n) signal into a plurality of spherical pulses to obtain partial correlations constituting the BOC autocorrelation function, and combines these partial correlations to generate a non-ambiguous correlation function It is possible to provide more accurate positioning accuracy in the next generation satellite navigation system.

Also, from the results of the simulation, it can be seen that the correlation function of the present invention provides better TESD performance than the BOC autocorrelation function and the correlation functions of the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart of a method of removing a peripheral peak for improving the sine phase BOC (n, n) signal tracking performance according to an embodiment of the present invention;
2 is a diagram showing spherical pulse signals divided into a received signal for a sinusoidal phase BOC (n, n) signal according to the present invention.
3 shows partial correlations for a sinusoidal BOC (n, n) signal according to the invention;
4 shows a correlation function according to the invention;
5 is a diagram for explaining a process of generating a correlation function according to the present invention;
FIG. 6 is a diagram illustrating TESD performance when the BOC autocorrelation function according to the present invention, the conventional invention, and the correlation functions of the present invention are used.
7 shows TESD performance of a correlation function according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart of a method of removing a peripheral peak for improving a sine-phase BOC (n, n) signal tracking performance according to an embodiment of the present invention.

First, a binary offset carrier (BOC) signal is generally classified into a sine phase BOC and a cosine phase BOC according to the phase of a subcarrier. The sine phase BOC and the cosine phase BOC mean that the subcarriers have a sine phase and a cosine phase, respectively, and can be represented by a sine phase BOC (kn, n) and a cosine phase BOC (kn, n). 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.

The received sine phase BOC (n, n) signal can be expressed by Equation (1).

Figure pat00001

Where d (t) is the navigation data, c (t) is the PRN code, and

Figure pat00002
Represents a subcarrier of the BOC signal.

The PRN code

Figure pat00003
Where P is the signal power,
Figure pat00004
Is the ith chip of the PRN code with period T,
Figure pat00005
A PRN code chip cycle,
Figure pat00006
The
Figure pat00007
Is a unit square wave existing in the square.

The subcarrier

Figure pat00008
Lt; RTI ID = 0.0 >
Figure pat00009
Denotes the sign of the m-th subcarrier pulse,
Figure pat00010
The
Figure pat00011
The unit square wave and the subcarrier pulse interval exist in
Figure pat00012
to be.

In general, the satellite navigation system provides a separate pilot channel for synchronization, and d (t) = 1 for fast and accurate synchronization in the pilot channel. The present invention develops a correlation function used in a signal tracking technique that assumes a pilot channel.

As described above, in order to solve the problem of ambiguity in signal tracing at the peripheral peak, which is not the main peak, and to improve the signal tracking performance, in the present invention, one sub-

Figure pat00013
R < / RTI > Thus, the sine phase BOC (n, n) signal is
Figure pat00014
Lt; RTI ID = 0.0 >
Figure pat00015
to be.

According to this, the sign of the first round pulse of the 2 r pulses with respect to the sine phase BOC (n, n)

Figure pat00016
And section
Figure pat00017
The
Figure pat00018
As shown in FIG. here,
Figure pat00019
Means an integer not greater than z.

FIG. 2 shows spherical pulse signals divided into a received signal for a sinusoidal phase BOC (n, n) signal according to the present invention. In the present invention, it is assumed that all PRN code chips are generated with the same probability distribution as +1 and -1 independent random variables. Also, the PRN code period T is generally a PRN code chip period

Figure pat00020
(I.e., d (t) = 1), which is much larger than the pilot channel and is not present during code tracking.

  The normalized BOC autocorrelation function can be expressed by the following equation (2).

Figure pat00021

here,

Figure pat00022
Is a function of the wave form and is expressed by the following Equation 3, and the partial correlation of the first is as shown in Equation 4, as shown in FIG.

Figure pat00023

Figure pat00024

Two overlapping, symmetric, correlation functions only at the main peak

Figure pat00025
Wow
Figure pat00026
Lt; / RTI >
Figure pat00027
Wow
Figure pat00028
To
Figure pat00029
, It is possible to generate a non-ambiguous correlation function in which the surrounding peaks are completely removed. As well as,
Figure pat00030
Wow
Figure pat00031
If the principal peaks of the line are narrower, a sharper peak can be obtained.

In order to make the above-mentioned symmetric correlation functions,

Figure pat00032
To
Figure pat00033
And the correlation function
Figure pat00034
.

Figure pat00035

From here,

Figure pat00036
The operation
Figure pat00037
As shown in Equation 6,
Figure pat00038
To
Figure pat00039
And the correlation function
Figure pat00040
Can be obtained.

Figure pat00041

Figure 4 shows the correlation function

Figure pat00042
and
Figure pat00043
, The final correlation function
Figure pat00044
. 4
Figure pat00045
Wow
Figure pat00046
Can be confirmed to be a symmetric correlation function overlapping only around the principal peak. Thus, using Equation (7), a non-ambiguous correlation function
Figure pat00047
Can be obtained.

Figure pat00048

From FIG. 4, it can be seen that the correlation function of the present invention has a sharp peak at a sharp edge than the correlation functions of the present invention. Specifically, the normalized height of the principal peak of the correlation function of the present invention is 1 when r = 1,

Figure pat00049
to be. Also, the width of the main peak is r = 1
Figure pat00050
, And when r > = 2
Figure pat00051
to be.

FIG. 5 is a graph showing the final correlation function

Figure pat00052
. The discriminator output for tracking the BOC signal code can be expressed as Equation (8).

Figure pat00053

here

Figure pat00054
And the discriminator output operates until it is zero by a numerically controlled oscillator in a delay lock loop.

Further, the tracking error standard deviation (TESD) performance can be simulated using the BOC autocorrelation function, the correlation functions of the present invention, and the correlation function of the present invention. TESD

Figure pat00055
Lt; / RTI >
Figure pat00056
Is the standard deviation of D (0)
Figure pat00057
The bandwidth of the loop filter,
Figure pat00058
Integral time, and
Figure pat00059
to be. The simulation can be performed assuming the following parameters.
Figure pat00060
,
Figure pat00061
,
Figure pat00062
,
Figure pat00063
, In the existing invention 2
Figure pat00064
Lt;
Figure pat00065
.

6 is a graph illustrating a TOC performance versus a BOC autocorrelation function according to a carrier-to-noise ratio (CNR) for a sinusoidal phase BOC (n, n) . Here, CNR

Figure pat00066
Lt; / RTI >
Figure pat00067
Is the noise power density. In the conventional invention 2,
Figure pat00068
The performance of simulation is different according to the value of TESD.
Figure pat00069
As shown in FIG. In the present invention,
Figure pat00070
Therefore,
Figure pat00071
The TESD performance of the correlation function of the present invention is the same as that of the conventional Invention 3. [

As shown in FIG. 6, the correlation function of the present invention has a low CNR range (

Figure pat00072
) Shows better TESD performance than the correlation function of the present invention, and shows better TESD performance as the value of r increases according to r.

FIG. 7 is a graph showing the relationship between the sine phase BOC (n, n)

Figure pat00073
, The TESD performance of the correlation function of the present invention is represented by r. As the r increases, the tracking performance of the correlation function of the present invention improves, but finally the TESD of the correlation function of the present invention converges.

Thus, the present invention divides subcarrier pulses of a sinusoidal phase BOC (n, n) signal into a plurality of spherical pulses to obtain partial correlations constituting a BOC autocorrelation function, and combines these partial correlations to obtain a non- Lt; / RTI >

Also, from the results of the simulation, it can be seen that the correlation function of the present invention provides better TESD performance than the BOC autocorrelation function and the correlation functions of the prior art.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (2)

Receiving a sinusoidal phase BOC signal;
Interpreting the received BOC signal into a plurality of spherical pulse shapes;
Obtaining partial correlations from the plurality of analyzed spherical pulses; And
Combining the partial correlations to produce two correlation functions that are symmetric with each other only around the main peak;
A method for removing peripheral peaks for improving the tracking performance of a sinusoidal phase BOC (n, n) signal. The method of claim 1,
Combining the generated two correlation functions to generate a non-ambiguous correlation function with the surrounding peaks removed;
(N, n) signal for further improving the tracking performance of the sine-phase BOC (n, n) signal.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106019328A (en) * 2016-05-27 2016-10-12 贵州大学 BOC signal auxiliary peak elimination method
KR101838406B1 (en) * 2016-11-30 2018-04-26 성균관대학교산학협력단 Tracking method for boc signal and tracking apparatus for boc signal
KR20180061625A (en) * 2016-11-30 2018-06-08 성균관대학교산학협력단 TRACKING METHOD FOR AltBOC(15,10) SIGNAL AND TRACKING APPARATUS FOR AltBOC(15,10) SIGNAL
KR20190130405A (en) * 2018-05-14 2019-11-22 성균관대학교산학협력단 Method and apparatus for generating non-ambiguous correlation function for binary offset carrier signal
KR20200017803A (en) * 2018-08-09 2020-02-19 성균관대학교산학협력단 A method for Generating an Unambiguous Correlation Function

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106019328A (en) * 2016-05-27 2016-10-12 贵州大学 BOC signal auxiliary peak elimination method
KR101838406B1 (en) * 2016-11-30 2018-04-26 성균관대학교산학협력단 Tracking method for boc signal and tracking apparatus for boc signal
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
KR20190130405A (en) * 2018-05-14 2019-11-22 성균관대학교산학협력단 Method and apparatus for generating non-ambiguous correlation function for binary offset carrier signal
KR20200017803A (en) * 2018-08-09 2020-02-19 성균관대학교산학협력단 A method for Generating an Unambiguous Correlation Function

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