KR102345813B1 - Boc time division variable weight correction method for boc signal ambiguity mitigation and device of same - Google Patents

Abstract

The present invention relates to a time division transformation weight correlation method for removing ambiguity in BOC signal reception and an apparatus using the same, and to a spreading code, a carrier wave, and a BOC (Binary Offset Carrier) signal based on a satellite signal. A time division weight signal generating step of dividing a signal period to arrange each of a plurality of time division BOC signals, each of which combines a time division sequence with the corresponding BOC signal to generate a time division weight signal, and the satellite signal and the time division weight signal based on the and a correlation value calculating step of calculating a correlation value.

Description

BOC TIME DIVISION VARIABLE WEIGHT CORRECTION METHOD FOR BOC SIGNAL AMBIGUITY MITIGATION AND DEVICE OF SAME

The present invention relates to a correlation technique for processing BOC-modulated satellite signals, and more particularly, time division for BOC signal reception ambiguity that can adjust a time-division sequence advantageously to remove ambiguity and mitigate multi-path effects according to signal processing steps A transform weight correlation method and an apparatus using the same.

GNSS (Global Navigation Satellite System) is a system for estimating the position of a receiver by receiving a satellite signal from an artificial satellite having a constant orbit as a satellite-based positioning system. The signal transmitted from the GNSS satellite includes the orbit of the transmitted satellite and time information of the navigation system, and the navigation receiver measures the time of arrival (TOA) of the satellite signal by using it. The navigation receiver may estimate the time of arrival of the satellite signal received by the navigation satellite, that is, the position, velocity, and time information of the navigation system of the receiver from the pseudorange measurement value and the position, velocity, acceleration, and clock offset information of the navigation satellite. Currently, the most widely used GNSS is the US GPS (Global Positioning System) developed in the 1970s and GLONASS operating in Russia. In addition, Galileo of the European Union, which was developed and operated in the late 1990s, BeiDou, which recently started development in China and provides services in the early phase-3 stage, and QZSS (Quasi (Quasi) for GPS-based reinforcement navigation in Japan) -Zenith Satellite System), NAVIC (Navigation Indian Constellation) developed in India is under continuous development and operation.

A Binary Offset Carrier (BOC) signal is used in a Galileo system that is a satellite navigation system and a Global Positioning System (GPS) system.

As a representative GNSS satellite signal using BOC signals, GPS L1C designed as part of the GPS modernization plan is transmitted with TMBOC (6, 1, 1/11) signal structure, and Galileo E1 signal is transmitted with CBOC (6, 1, 1/11) signal. ), E5a/E5B are transmitted in the AltBOC(15,10) signal structure. In addition, through the recent development and initial operation of BeiDou Phase-3, BeiDou satellite signal B1C is designed with a QMBOC (6,1,4/33) signal structure and is being transmitted.

Unlike the binary phase shift keying (BPSK) method used in GPS, BOC modulation has a characteristic of moving energy from the center of the band to the edge. This characteristic makes it easy to share a band with existing signals, thereby enabling the sharing of a frequency band between the GPS system and the Galileo system.

One of the most important issues in Galileo GNSS is the acquisition and tracking of BOC signals. The autocorrelation function of the BOC signal has ambiguity, showing several peripheral peaks near the maximum peak. Therefore, there is a risk of convergence to a false lock point or fall into an unstable state in the acquisition and tracking phase.

In addition, since the multipath error in the satellite navigation system is directly related to the distance measurement error, mitigating the multipath effect is a very important factor in implementing the satellite navigation system.

Korean Patent Registration No. 10-1139139 (April 16, 2012)

An embodiment of the present invention is to provide a time division transform weight correlation method for removing ambiguity in BOC signal reception, which can effectively remove ambiguity of a correlation value derived using a BOC signal, and an apparatus using the same.

An embodiment of the present invention is to provide a time division transform weight correlation method and apparatus using the same for removing ambiguity in BOC signal reception capable of mitigating the multi-path influence of a correlation value derived using a BOC signal.

An embodiment of the present invention adjusts a time division sequence according to a signal processing step to remove ambiguity and multipath error of a correlation value derived using a BOC signal according to a situation. An object of the present invention is to provide a correlation method and an apparatus using the same.

In the embodiments, the time division transformation weight correlation method for BOC signal reception ambiguity removal includes a simulated signal generating step of generating a spreading code, a carrier wave, and a BOC (Binary Offset Carrier) signal based on a satellite signal, the period of the satellite signal A time division weight signal generating step of dividing each of the plurality of time division BOC signals, each combining a time division sequence with the corresponding BOC signal to generate a time division weight signal, and a correlation value based on the satellite signal and the time division weight signal and a correlation value calculation step of calculating .

The simulated signal generating step may determine the BOC signal by selecting one of CBOC (Composite BOC), TMBOC (Time Multiplexed BOC), and AltBOC (Alternative BOC) based on the type of the satellite signal.

In the step of generating the simulated signal, a subcarrier obtained by combining the selected one CBOC, TMBOC, or AltBOC signal in the process of generating each of the plurality of BOC signals may be used as the BOC signal.

In the step of generating the time division weight signal, all or part of the time division sequence is extracted and multiplied by the extracted time division sequence, the time division BOC signal, and the satellite signal to generate a first weight signal, and the unextracted time division sequence and the time division BOC signal; A second weight signal may be generated by taking an absolute value multiplied by the satellite signal, and the time division weight signal may be determined as a value obtained by combining the first weight signal and the second weight signal.

In the step of generating the time-division weight signal, when all or only a part of the time-division sequence is extracted, the extracted time-division sequence may be extracted to form a pair.

In the step of generating the time division weight signal, the time division sequence extracted from the time division sequence may be adjusted according to the signal processing step.

The generating of the time-division weighted signal generates a plurality of intermediate signals based on a plurality of time-division sequences, combines the plurality of intermediate signals to generate the time-division weighted signal, and generates the satellite signal and each of the plurality of time-division BOC signals. It can be combined with time division sequences.

In embodiments, the time division transformation weight correlation apparatus for removing ambiguity in BOC signal reception includes a replica signal generator that generates a spreading code, a carrier wave, and a BOC (Binary Offset Carrier) signal based on a satellite signal, and a period of the satellite signal. A time division weighting signal generator that divides and arranges each of a plurality of time division BOC signals, each of which combines a time division sequence with a corresponding BOC signal to generate a time division weight signal, and a correlation value based on the satellite signal and the time division weight signal and a correlation value calculating unit for calculating .

The disclosed technology may have the following effects. However, this does not mean that a specific embodiment should include all of the following effects or only the following effects, so the scope of the disclosed technology should not be understood as being limited thereby.

The time division transformation weight correlation method for removing ambiguity in BOC signal reception according to an embodiment of the present invention and an apparatus using the same can effectively remove ambiguity of a correlation value derived using a BOC signal.

The time division transformation weight correlation method and apparatus using the same for BOC signal reception ambiguity removal according to an embodiment of the present invention can mitigate multipath influence of correlation values derived using BOC signals.

Ambiguity and multipath error of a correlation value derived using a BOC signal by adjusting a time division sequence according to a signal processing step in a time division transformation weight correlation method for removing ambiguity in BOC signal reception and an apparatus using the same according to an embodiment of the present invention can be removed according to the circumstances.

1 is a view for explaining a satellite signal-based position estimation system according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a physical configuration of a time division transform weight correlator for removing ambiguity in BOC signal reception in FIG. 1 .
FIG. 3 is a block diagram illustrating a functional configuration of a time division transformation weight correlation apparatus for removing ambiguity in BOC signal reception in FIG. 1 .
4 is a diagram illustrating a time division transformation weight (TDVW) correlation concept according to an embodiment.
5 is a diagram for explaining calculation of a correlation value according to an exemplary embodiment.
6 is a flowchart illustrating a correlation value derivation process performed in the time division transformation weight correlation apparatus for removing ambiguity in BOC signal reception in FIG. 1 .
7 is a diagram illustrating a relationship between a BOC signal and a satellite signal.
8 is a diagram illustrating graphs of in-phase and out-of-phase of a CBOC signal.
9 is a diagram illustrating a relationship between a spread spectrum code, a BOC signal, and a time division sequence.
10A-10E are diagrams illustrating derivation of a time-division correlation value between a GPS L1 C/A signal and a BOC(fs,fc) signal.

Since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiment described in the text. That is, since the embodiment may have various changes and may have various forms, it should be understood that the scope of the present invention includes equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such effects, it should not be understood that the scope of the present invention is limited thereby.

On the other hand, the meaning of the terms described in the present application should be understood as follows.

Terms such as “first” and “second” are for distinguishing one component from another, and the scope of rights should not be limited by these terms. For example, a first component may be termed a second component, and similarly, a second component may also be termed a first component.

When a component is referred to as being “connected to” another component, it may be directly connected to the other component, but it should be understood that other components may exist in between. On the other hand, when it is mentioned that a certain element is "directly connected" to another element, it should be understood that the other element does not exist in the middle. Meanwhile, other expressions describing the relationship between elements, that is, "between" and "between" or "neighboring to" and "directly adjacent to", etc., should be interpreted similarly.

The singular expression is to be understood as including the plural expression unless the context clearly dictates otherwise, and terms such as "comprises" or "have" refer to the embodied feature, number, step, action, component, part or these It is intended to indicate that a combination exists, and it should be understood that it does not preclude the possibility of the existence or addition of one or more other features or numbers, steps, operations, components, parts, or combinations thereof.

In each step, identification numbers (eg, a, b, c, etc.) are used for convenience of description, and identification numbers do not describe the order of each step, and each step clearly indicates a specific order in context. Unless otherwise specified, it may occur in a different order from the specified order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

The present invention can be embodied as computer-readable codes on a computer-readable recording medium, and the computer-readable recording medium includes all types of recording devices in which data readable by a computer system is stored. . Examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like. In addition, the computer-readable recording medium is distributed in a computer system connected to a network, so that the computer-readable code can be stored and executed in a distributed manner.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms defined in general used in the dictionary should be interpreted as having the meaning consistent with the context of the related art, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present application.

1 is a view for explaining a satellite signal-based position estimation system 100 according to an embodiment of the present invention.

Referring to FIG. 1 , the satellite signal-based position estimation system 100 may include a user terminal 110 , a time division transformation weight correlation device 130 for removing ambiguity in BOC signal reception, and a database 150 .

The user terminal 110 may correspond to a computing device that can check information about a process performed in the time division transformation weight correlation device for BOC signal reception ambiguity removal, and may be implemented as a smartphone, a notebook computer, or a computer, and must be The present invention is not limited thereto, and may be implemented in various devices such as a tablet PC. The user terminal 110 may be connected to the time division transformation weight correlator 130 for BOC signal reception ambiguity removal through a network, and the plurality of user terminals 110 are time division transformation weight correlation apparatus for BOC signal reception ambiguity removal ( 130) can be simultaneously connected.

The time division transformation weight correlation apparatus 130 for removing ambiguity in BOC signal reception may be implemented as a computer or a server corresponding to a program capable of extracting a correlation value for a satellite signal. The time division transformation weight correlation device 130 for BOC signal reception ambiguity removal may be wirelessly connected to the user terminal 110 through Bluetooth, WiFi, a communication network, etc., and may exchange data with the user terminal 110 through the network. have.

In an embodiment, the time division transformation weight correlation apparatus 130 for removing ambiguity in BOC signal reception may store information necessary in a process of extracting a correlation value for a satellite signal in conjunction with the database 150 . Meanwhile, unlike FIG. 1 , the time division transformation weight correlation apparatus 130 for removing ambiguity in BOC signal reception may be implemented by including the database 150 therein. The time division transformation weight correlator 130 for BOC signal reception ambiguity removal may be implemented by including a processor, a memory, a user input/output unit, and a network input/output unit, which will be described in more detail with reference to FIG. 2 .

In an embodiment, the time division transformation weight correlation apparatus 130 for removing ambiguity in BOC signal reception may store a correlation value and information about a time division sequence necessary for extracting a correlation value in association with the database 150 .

The database 150 may be operated by an independent device to logically configure a single database, and may store data generated by the time division transformation weight correlation device 130 for removing ambiguity in BOC signal reception.

FIG. 2 is a block diagram illustrating a physical configuration of the time division transformation weight correlator 130 for BOC signal reception ambiguity removal shown in FIG. 1 .

Referring to FIG. 2 , the time division transformation weight correlation device 130 for BOC signal reception ambiguity removal may be implemented including a processor 210 , a memory 230 , a user input/output unit 250 , and a network input/output unit 270 . have.

The processor 210 may execute a procedure for performing each operation required in the process of deriving the correlation value, manage the memory 230 read or written throughout the process, and Synchronization time between volatile memory and non-volatile memory can be scheduled. The processor 210 may control the overall operation of the time division transformation weight correlation device 130 for BOC signal reception ambiguity removal, and electrically connect the memory 230 , the user input/output unit 250 , and the network input/output unit 270 . They can be connected to control the flow of data between them. The processor 210 may be implemented as a central processing unit (CPU) of the time division transformation weight correlator 130 for BOC signal reception ambiguity removal.

The memory 230 is implemented as a non-volatile memory such as a solid state drive (SSD) or a hard disk drive (HDD), and is used to store overall data required for the time division conversion weight correlator 130 for BOC signal reception ambiguity removal. It may include an auxiliary memory, and may include a main memory implemented as a volatile memory such as random access memory (RAM).

The network input/output unit 270 includes an environment for connecting with an external device or system through a network, for example, a local area network (LAN), a metropolitan area network (MAN), a wide area network (WAN), and a VAN (Wide Area Network) (VAN). It may include an adapter for communication such as Value Added Network).

FIG. 3 is a block diagram illustrating a functional configuration of the time division transformation weight correlator 130 for BOC signal reception ambiguity removal shown in FIG. 1 .

Referring to FIG. 3 , the time division transformation weight correlation apparatus 130 for removing ambiguity in BOC signal reception includes a simulated signal generation unit 310 , a time division weight signal generation unit 330 , a correlation value calculation unit 350 , and a control unit 370 . ) may be included.

delete

The replica signal generator 310 may generate a spreading code, a carrier wave, and a BOC (Binary Offset Carrier) signal based on the satellite signal. The BOC signal is mainly designed to have a multiple frequency of the primary code or spreading code for satellite identification and pseudorange calculation, and accordingly, the bandwidth of the main code is maintained, and the frequency is increased by the added BOC signal. Transitions and divisions of signal power will occur. BOC modulation has relatively high positioning accuracy by using a higher code frequency than PSK (Phase Shift Keying) modulation, and the frequency of the existing GPS (Global Positioning System) L1 C/A code-based satellite navigation signal It has the advantage of being able to separate from the band. The BOC signal may be defined as in [Equation 1].

[Equation 1]

For example, the relationship between BOC(1,1) and the spread spectrum code of the GPS L1 C/A signal may be expressed as shown in FIG. 7A. This indicates a signal having a spreading code of 1.023 MHz and a BOC(1,1) modulation technique applied.

7B shows a case where the spreading code is 1.023 MHz and BOC(2,1). This means that one chip includes two sub-carriers.

In one embodiment, the simulated signal generator 310 may determine the BOC signal by selecting one of CBOC (Composite BOC), TMBOC (Time Multiplexed BOC), and AltBOC (Alternative BOC) based on the type of satellite signal. For example, when the satellite signal is GPS L1C, the simulated signal generator 310 may determine the BOC signal as TMBOC(6, 1, 1/11).

The CBOC signal is a signal obtained by combining the BOC(1,1) signal and the BOC(6,1) signal in in-phase and anti-phase according to the designed signal power ratio, and can be defined as in [Equation 2].

[Equation 2]

A graph for in-phase and out-of-phase of the CBOC signal may be represented as shown in FIG. 8 .

The TMBOC signal is a subcarrier in which two time-divided BOC signals are combined, and the frequency can be defined as in [Equation 3].

[Equation 3]

The time t of the TMBOC signal can be defined as in [Equation 4].

[Equation 4]

The display of the TMBOC signal can be defined as in [Equation 5].

[Equation 5]

The AltBOC signal has high spectral isolation between two upper main lobes and two lower main lobes. Each main band is composed of a different spreading code, and as a result, if it is designed to have two upper and lower main bands, four different spreading codes are transmitted with one modulation technique. For high frequency independence, the subcarrier generation of the AltBOC signal is defined as a complex signal. The AltBOC signal can be designed to have one upper main band and one lower main band, and the simplest form of the AltBOC signal can be defined as in [Equation 6].

[Equation 6]

In an embodiment, the replica signal generator 310 may use a subcarrier obtained by combining one CBOC, TMBOC, or AltBOC signal selected in the process of generating each of the plurality of BOC signals as the BOC signal. For example, when generating a plurality of BOC signals, the replica signal generator 310 may combine the BOC signals according to a signal processing step and use them as sub-carriers.

The time division weight signal generator 330 divides the period of the satellite signal to arrange each of a plurality of time division BOC signals, and generates a time division weight signal by combining a time division sequence (TDS) with the corresponding BOC signal. can do. For example, the time division weight signal generator 330 may determine a time division sequence composed of n time divisions (n is a natural number) for a signal to which a BOC signal is applied to a spreading code. The time division sequence may be designed such that the spread spectrum code phase change is divided into one period. The relationship between the spread spectrum code, the BOC signal, and the time division sequence can be expressed as shown in FIG. 9 .

9 shows the relationship on the time axis of a replica signal and a time division sequence (TDS) signal, with a spreading code of 1.023 MHz and a BOC(1,1) modulation technique applied to a signal A case consisting of a total of n time divisions is shown.

Here, the _{n time division sequences (TDS) from time division sequence TDS 1} to TDS _n can be divided into one period with the spread spectrum code phase change. have.

에서

으로 정의되는 상관 가중치를 가지도록 하여, 설정한 상관 가중치에 따라 상관 값에 반영되는 상관 특성에 차이를 발생시킬 수 있다.In addition, the time division weight signal generation unit 330 is configured to generate each time division sequence.

at

By having a correlation weight defined as

In an embodiment, the time division weight signal generator 330 extracts all or part of the time division sequence and multiplies the extracted time division sequence and the time division BOC signal to generate a first weight signal, and generates the unextracted time division sequence and the time division BOC signal. A second weight signal may be generated by taking an absolute value of the multiplied value, and the time division weight signal may be determined as a combined value of the first weight signal and the second weight signal. The first weight signal may be calculated by multiplying the selected time division sequence by the time division BOC signal and the satellite signal, and the second weight signal may be calculated by multiplying the unselected time division sequence by the time division BOC signal and the satellite signal, wherein the first weight signal and a time division weight signal that is the sum of the second weight signal may be defined as the following [Equation 7].

[Equation 7]

In an embodiment, the time-division weight signal generator 330 may extract all or part of the time-division sequence to form a pair when extracting all or a part of the time-division sequence. For example, when extracting two time division sequences from an n-divided time division sequence, the time division weight signal generator 330 may extract a first time division sequence and a last time division sequence. As another example, when the time division weight signal generator 330 extracts four time division sequences from the time division sequence divided by n, the first and second time division sequences and the time division sequence just before the last and last may be extracted. The case where one end of each n-divided time-division sequence is extracted is called 'ele2', and the case where two ends of each n-divided time-division sequence are extracted is called 'ele4'. Correlation values for the GPS L1 C/A signal and the BOC(1,1) 4-split signal according to an experiment are derived as shown in FIG. 10A . As can be seen in FIG. 10A , the correlation value is a combination of the subcarrier characteristic and the correlation value characteristic of the spread spectrum code, and it is confirmed that the misdetermining point characteristic of the subcarrier and the BPSK (Binary Phase Shift Keying) correlation value characteristic are combined. can The correlation value derived in this way is more similar to the BPSK correlation value than the existing BOC signal correlation value, so that ambiguity according to the BOC signal is reduced.

The time division weight signal generator 330 may adjust the value of k in 'ele k', and when the value of k increases, it is expected that the code phase error according to the multipath error of the correlation value will be improved. The improvement of the phase error can be confirmed through FIGS. 10B to 10D . FIG. 10b shows a correlation value derived by applying a time division sequence of 'ele2' to a GPS L1 C/A satellite signal and a BOC(1,1) 8-split signal, and FIG. 10c shows a GPS L1 C/A satellite signal and a BOC signal. (1,1) Correlation values are derived by applying the time division sequence of 'ele4' to the 8-split signal. FIG. 10D shows the estimated code phase error according to the multipath error when the BOC(1,1) signal is divided into 16 divisions and ele values are different. According to FIG. 10D , it can be confirmed that the phase error of 'ele 8' is the smallest.

In an embodiment, the time division weight signal generator 330 may adjust the time division sequence extracted from the time division sequence according to the signal processing step. For example, the time division weight signal generator 330 may variably perform ambiguity removal and multipath effect mitigation of satellite signals according to the processing steps of the satellite signals. The time division weight signal generator 330 may extract a time division sequence as 'ele 0' to remove ambiguity when acquiring a satellite signal, and gradually increase the k value from 'ele k' at the beginning of satellite signal tracking to reduce ambiguity. At the same time as mitigation, the multipath effect can be mitigated, and the value of k at 'ele k' can be determined as the maximum to focus on mitigating the multipath effect when the satellite signal tracking is stable. Referring to FIG. 10D , it can be confirmed that the multipath effect is alleviated as the value of k in 'ele k' is increased. However, when the value of k in 'ele k' is increased, the peak-to-peak deviation increases and the ambiguity mitigation characteristic may deteriorate, as can be seen in FIG. 10E .

10D is a graph showing a weighted correlation value for a BOC(1,1) signal divided into 16, and it can be seen that the deviation of the peak value increases as the value of k in 'ele k' increases. For example, when acquiring a satellite signal as shown in FIG. 10D , the time-division weighting signal generator 330 may generate a time-division weighting signal using 16-divided BOC(1,1) signals at 0.5 chip intervals, and tracking the signal. Initially, a time-division weighted signal can be generated using the 0.25-chip 16-division BOC(1,1) 'ele 5' signal, and when the signal tracking is stable, the 16-division BOC(1,1) ' A time division weight signal can be generated using the ele 8' signal.

In an embodiment, the time division weight signal generator 330 may generate a plurality of intermediate signals based on a plurality of time division sequences and combine the plurality of intermediate signals to generate a time division weight signal. For example, the time division weight signal generator 330 may determine a time division sequence by a user variably according to the type of satellite signal, and may generate a time division weight signal by combining intermediate signals derived according to each time division sequence. .

In an embodiment, the time division weight signal generator 330 may combine the satellite signal and each of the plurality of time division BOC signals with the time division sequence. For example, the time division weight signal generator 330 may combine the time division sequence not only with the plurality of time division BOC signals but also with the satellite signals. As another example, the time division weight signal generator 330 may combine a different time division sequence with each of the satellite signals and the plurality of time division BOC signals.

4 is a diagram illustrating a time division transformation weight (TDVW) correlation concept, and FIG. 5 is a diagram illustrating calculation of a correlation value according to an embodiment.

4 and 5 , the correlation value calculator 350 may calculate a correlation value based on a satellite signal and a time division weight signal. For example, the correlation value calculator 350 may derive a correlation value by combining the satellite signal and the time division weight signal.

The correlation value may be defined by [Equation 8].

[Equation 8]

Here, T _c denotes one entire period of the spread spectrum code for deriving a correlation value according to a time-division sequence (TDS), TDS _i denotes an i-th time-division sequence, respectively, and a correlation value R _TDVW is determined according to n time-division sequences do.

The controller 370 controls the overall operation of the time division transformation weight correlation apparatus 130 for BOC signal reception ambiguity removal, and the simulation signal generation unit 310 , the time division weight signal generation unit 330 , and the correlation value calculation unit 350 . ) can manage the control flow or data flow between

6 is a flowchart illustrating a correlation value derivation process performed in the time division transformation weight correlation apparatus for removing ambiguity in BOC signal reception in FIG. 1 .

Referring to FIG. 6 , the time division transform weight correlator 130 for removing ambiguity in BOC signal reception according to an embodiment includes a spreading code, a carrier wave, and a BOC (Binary) based on a satellite signal through the simulated signal generator 310 . Offset carrier) signal may be generated (S610).

The time-division weighted correlator 130 for removing ambiguity in BOC signal reception divides the period of the satellite signal through the time-division weighted signal generator 330 to arrange each of the plurality of time-division BOC signals, and each is to the corresponding BOC signal. A time division weight signal may be generated by combining the time division sequences (S630).

The time division transformation weight correlation apparatus 130 for removing ambiguity in BOC signal reception may calculate a correlation value based on the satellite signal and the time division weight signal through the correlation value calculator 350 ( S650 ).

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it can be done.

100: satellite signal-based positioning system
110: user terminal
130: Time division transformation weight correlation device for BOC signal reception ambiguity removal
150: database
210: processor 230: memory
250: user input/output unit 270: network input/output unit
310: simulated signal generator 330: time division weight signal generator
350: correlation value calculation unit 370: control unit

Claims (8)

A simulated signal generating step of generating a spreading code, a carrier wave, and a BOC (Binary Offset Carrier) signal based on the satellite signal;
a time division weight signal generating step of dividing the period of the satellite signal to arrange each of a plurality of time division BOC signals, and generating a time division weight signal by combining a time division sequence with the corresponding BOC signal; and
Comprising a correlation value calculation step of calculating a correlation value based on the satellite signal and the time division weight signal,
The step of generating the time division weight signal is
A first weight signal is generated by multiplying the extracted time division sequence by extracting all or a part of the time division sequence, the time division BOC signal, and the satellite signal, and the time division sequence that is not extracted is multiplied by the time division BOC signal and the satellite signal. A time division transformation weight correlation method for removing ambiguity in BOC signal reception, comprising generating a second weight signal by taking an absolute value and determining the time division weight signal as a value obtained by combining the first weight signal and the second weight signal.
According to claim 1, wherein the step of generating the simulated signal
Time division transformation for BOC signal reception ambiguity removal, characterized in that the BOC signal is determined by selecting one of CBOC (Composite BOC), TMBOC (Time Multiplexed BOC), or AltBOC (Alternative BOC) based on the type of the satellite signal Weighted correlation method.
According to claim 2, wherein the step of generating the simulated signal
A time division transformation weight correlation method for removing ambiguity in BOC signal reception, characterized in that in the process of generating each of the plurality of BOC signals, a subcarrier obtained by combining the selected one CBOC, TMBOC or AltBOC signal is used as the BOC signal.
delete The method of claim 1, wherein the generating of the time division weight signal comprises:
When all or a part of the time-division sequence is extracted, the time-division transformation weight correlation method for removing ambiguity in BOC signal reception, characterized in that the extracted time-division sequences are extracted to form a pair.
The method of claim 5, wherein the generating of the time division weight signal comprises:
A time division transformation weight correlation method for removing ambiguity in BOC signal reception, characterized in that it is possible to adjust the time division sequence extracted from the time division sequence according to the signal processing step.
delete a replica signal generator for generating a spreading code, a carrier wave, and a BOC (Binary Offset Carrier) signal based on a satellite signal;
a time-division weighting signal generator for dividing a period of the satellite signal to arrange each of a plurality of time-division BOC signals, each of which combines a time-division sequence with the corresponding BOC signal to generate a time-division weighting signal; and
Comprising a correlation value calculator for calculating a correlation value based on the satellite signal and the time division weight signal,
The time division weight signal generating unit
A first weight signal is generated by multiplying the extracted time division sequence by extracting all or a part of the time division sequence, the time division BOC signal, and the satellite signal, and the time division sequence that is not extracted is multiplied by the time division BOC signal and the satellite signal. A time division transformation weight correlation apparatus for removing ambiguity in BOC signal reception, characterized in that taking an absolute value to generate a second weight signal and determining the time division weight signal as a value obtained by combining the first weight signal and the second weight signal.

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