KR102154753B1 - Method for tracking alternative binary offset carrier signal and apparatus therefor - Google Patents

Abstract

In the present invention, a method for tracking an alternative binary offset carrier (AltBOC) signal and an apparatus therefor are disclosed.
Specifically, in a method for a receiving device to track an alternate binary offset carrier (AltBOC) signal, the method includes a process of receiving the AltBOC signal and a plurality of subcarriers of the received AltBOC signal. The process of dividing into subcarriers, and the plurality of partial subcarriers, including a first partial subcarrier and a second partial subcarrier, and an autocorrelation function for the AltBOC signal and a first partial correlation function for the first partial subcarrier A process of generating a first correlation function by calculating, a process of generating a second correlation function by calculating an autocorrelation function for the AltBOC signal and a second partial correlation function for the second partial subcarrier, and It may include a process of generating a third correlation function by calculating the first correlation function and the second correlation function, and a process of tracking the AltBOC signal using the third correlation function.

Description

TECHNICAL FIELD [Method for tracking alternative binary offset carrier signal and apparatus therefor]

The present invention relates to a method for tracking a binary offset carrier (BOC) signal, and in more detail, a method for generating a correlation function for tracking an alternative binary offset carrier (Alternative Binary Offset Carrier, AltBOC), and It relates to a device that supports it.

Global navigation satellite system (GNSS) is a system that provides location information of objects on the ground using satellites in space. The most popular GNSS is the Global Positioning System (GPS) developed in the United States. Recently, GLONASS, COMPASS, and Galileo have made additional developments, and the number of satellites that can be used for the satellite navigation system is increasing further.

However, as the satellite navigation system continues to develop, problems related to the frequency band occupied by the satellite navigation system may arise. This is because, as the number of satellites and/or the satellite navigation system increases, the types of signals to be transmitted also diversify, and a wider frequency band is required.

Accordingly, the new satellite navigation systems occupy the same frequency band in the signal modulated by the conventional phase shift keying (PSK) method, and to use the new signal independently, the binary offset carrier is additionally multiplied by the subcarrier. BOC) signal was developed and used in practice. In this case, an alternative binary offset carrier (AltBOC) signal, which is a type of BOC signal, may be used.

The present specification proposes a method and apparatus for generating a correlation function for tracking an alternative binary offset carrier (AltBOC) signal.

Specifically, the present specification creates an unambiguous correlation function with improved tracking performance by using an auto correlation function and a partial correlation function generated based on the AltBOC signal. A method and an apparatus for the same are proposed.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. I will be able to.

In a method for tracking an alternative binary offset carrier (AltBOC) signal by a receiving device according to an embodiment of the present specification, the method includes a process of receiving the AltBOC signal and a subcarrier of the received AltBOC signal A process of dividing the subcarriers into a plurality of partial subcarriers, and the plurality of partial subcarriers include a first partial subcarrier and a second partial subcarrier, and an autocorrelation function for the AltBOC signal and a first subcarrier for the first partial subcarrier A process of generating a first correlation function by calculating a partial correlation function, and a process of generating a second correlation function by calculating an autocorrelation function for the AltBOC signal and a second partial correlation function for the second partial subcarrier And, generating a third correlation function by calculating the first correlation function and the second correlation function, and tracking the AltBOC signal using the third correlation function.

In addition, in the method according to an embodiment of the present specification, the first partial subcarrier and the second partial subcarrier may have a symmetric relationship.

In addition, in the method according to an embodiment of the present specification, the first partial subcarrier and the second partial subcarrier are two parts in which a zero crossing point of a partial correlation function is closest to a value of zero among the plurality of partial subcarriers. It may correspond to subcarriers.

In addition, in the method according to an embodiment of the present specification, the third correlation function may be a correlation function in which a peripheral peak is removed using the first correlation function and the first correlation function.

In addition, in the method according to an embodiment of the present specification, the first correlation function, the second correlation function, and the third correlation function may be generated using a correlation operation.

In the receiving apparatus for tracking an alternative binary offset carrier (AltBOC) signal according to an embodiment of the present specification, the receiving apparatus comprises: a transceiving unit for receiving an AltBOC signal and a control unit for processing the received AltBOC signal It may include. The control unit divides a subcarrier of the received AltBOC signal into a plurality of partial subcarriers, and the plurality of partial subcarriers includes a first partial subcarrier and a second partial subcarrier, and an autocorrelation function for the AltBOC signal and By calculating a first partial correlation function for the first partial subcarrier, a first correlation function is generated, and an autocorrelation function for the AltBOC signal and a second partial correlation function for the second partial subcarrier are calculated. 2 A correlation function may be generated, the first correlation function and the second correlation function are calculated to generate a third correlation function, and the AltBOC signal may be tracked using the third correlation function.

According to an embodiment of the present invention, the ambiguity problem of an alternative binary offset carrier (AltBOC) signal can be reduced by removing the side peaks present in the correlation function. There is.

Further, according to an embodiment of the present invention, by increasing the sharpness of the main peak of the correlation function, there is an effect of supporting excellent signal tracking performance.

The effects that can be obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description to aid in understanding of the present invention, provide embodiments of the present invention, and describe technical features of the present invention together with the detailed description.
1 shows an example of a subcarrier of an alternative binary offset carrier (AltBOC) signal to which the method proposed in the present specification can be applied.
2 shows another example of a subcarrier of an AltBOC signal to which the method proposed in the present specification can be applied.
3 shows another example of a subcarrier of an AltBOC signal to which the method proposed in the present specification can be applied.
4 shows an example of a subcarrier configured by dividing each subcarrier of an AltBOC signal to which the method proposed in the present specification can be applied.
5 shows another example of a subcarrier configured by dividing each subcarrier of an AltBOC signal to which the method proposed in the present specification can be applied.
6 shows examples of correlation calculation results between an autocorrelation function and a partial correlation function to which the method proposed in the present specification can be applied.
7 shows an example of a non-ambiguous correlation function to which the method proposed in the present specification can be applied.
8 shows an example of an autocorrelation function and an unambiguous correlation function to which the method proposed in the present specification can be applied.
9 shows an example of comparing an unambiguous correlation function to which the method proposed in this specification can be applied, a correlation function according to a conventional method, and an autocorrelation function.
10 shows another example of comparing an unambiguous correlation function to which the method proposed in the present specification can be applied, a correlation function according to a conventional method, and an autocorrelation function.
11 shows another example of comparing an unambiguous correlation function to which the method proposed in the present specification can be applied, a correlation function according to a conventional method, and an autocorrelation function.
12 is a flowchart illustrating an operation of a reception device tracking an AltBOC signal to which the method proposed in the present specification can be applied.
13 shows an example of a block diagram showing the configuration of a reception device to which the method proposed in the present specification can be applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description to be disclosed hereinafter together with the accompanying drawings is intended to describe exemplary embodiments of the present invention, and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, those of ordinary skill in the art know that the invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted, or may be shown in a block diagram form centering on core functions of each structure and device. In addition, it is intended to clarify that the division of the constituent units described in the present specification is merely divided by the main functions that each constituent unit is responsible for. In other words, two or more constituent parts to be described below may be combined into one constituent part, or one constituent part may be divided into two or more according to more subdivided features.

In a satellite navigation system, it can be important to acquire signals quickly and accurately. This may mean that the peak must be obtained without ambiguity in the auto correlation function.

However, in the autocorrelation function of an alternative binary offset carrier (AltBOC) signal, a main peak and one or more side peaks may exist together. For this reason, there may be a problem that a signal is tracked at a peripheral peak other than the main peak, which is a tracking point of the AltBOC signal. When a signal is tracked at a peripheral peak, it is difficult to accurately obtain desired location information, and thus a method of using a correlation function from which the peripheral peak is removed for signal tracking needs to be considered.

In the case of using the AltBOC signal, the ambiguity problem as described above occurs, but in view of the fact that a sharper main peak can be obtained than the conventional PSK (Phase Shift Keying) signal, the AltBOC signal is frequently used. Here, being able to obtain a sharper main peak may mean having excellent signal tracking performance.

In consideration of this point, the present specification proposes a method of allowing the AltBOC signal to be used without ambiguity and obtaining a sharp main peak. Specifically, a method of generating an unambiguous correlation function with improved tracking performance using an auto correlation function and a partial correlation function generated based on the received AltBOC signal And it proposes a method of tracking the AltBOC signal through this.

The AltBOC signal may be given by Equation 1.

In Equation 1, g(t) denotes an AltBOC signal, P denotes signal power, and d(t) denotes navigation data.

의 값을 가진다. 한,

는 [0, T_c/8]에 존재하는 단위 구형파를 의미하며, Tc는 의사 잡음 부호의 칩 주기를 의미한다.c _i denotes the value of the i-th pseudorandom noise (PRN), and the ceil function denotes a function to round up a factor. sc _i means values of subcarriers of the AltBOC signal, and mod(a, b) means the remainder of a/b. sci is when the value of i is 0 to 7, respectively

Has the value of One,

Denotes a unit square wave existing in [0, T _c /8], and Tc denotes the chip period of the pseudo noise code.

1 shows an example of a subcarrier of an alternative binary offset carrier (AltBOC) signal to which the method proposed in the present specification can be applied. 1 is merely for convenience of description and does not limit the scope of the present invention.

Referring to Equation 1 and FIG. 1, a subcarrier may be divided into eight parts within one period T _c . A subcarrier composed of eight pulses as described above may correspond to a basic subcarrier of the AltBOC signal. In this case, each pulse may be referred to as a partial subcarrier. That is, in the case of FIG. 1, the subcarrier may be composed of 8 partial subcarriers.

In this case, various subcarrier types may be considered according to the use of the signal (ie, the use of the signal). The AltBOC signal may be expressed as AltBOC(k*n, n). Here, k may mean a ratio (ie, T _s /T _c ) between the chip period (T _c ) of the PRN code and the period (T _s ) of the subcarrier. The ratio value may be set to 1, 1.5, 2, or the like.

According to this, the subcarrier shown in FIG. 1 may be expressed as AltBOC(n, n). Alternatively, examples of subcarriers when the ratio is not 1 may be the same as those of FIGS. 2 and 3.

2 shows another example of a subcarrier of an AltBOC signal to which the method proposed in the present specification can be applied. 2 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 2, a subcarrier of one period is composed of 12 pulses (ie, 12 partial subcarriers), and corresponds to a case where the ratio of the chip period of the PRN code and the period of the subcarrier is 1.5. In this case, the corresponding subcarrier may be expressed as AltBOC (1.5n, n).

3 shows another example of a subcarrier of an AltBOC signal to which the method proposed in the present specification can be applied. 3 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 3, a subcarrier of one period is composed of 16 pulses (ie, 16 partial subcarriers), and corresponds to a case where the ratio of the chip period of the PRN code and the period of the subcarrier is 2. In this case, the corresponding subcarrier may be expressed as AltBOC(2n, n).

Further, partial subcarriers (ie, existing partial subcarriers) constituting the subcarriers of the AltBOC signal may be divided into S pulses. That is, the AltBOC signal may consist of 8S pulses (or 8S partial subcarriers). Here, S is a natural number. However, as the value of S increases, the process of assembling the partial correlation function also becomes more complicated, and therefore an appropriate S value needs to be selected according to the requirements of the system.

4 shows an example of a subcarrier configured by dividing each subcarrier of an AltBOC signal to which the method proposed in the present specification can be applied. 4 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 4, each partial subcarrier of AltBOC (1.5n, n) may be divided twice (ie, S = 2). In this case, 24 partial subcarriers may be set (or generated) per chip.

5 shows another example of a subcarrier configured by dividing each subcarrier of an AltBOC signal to which the method proposed in the present specification can be applied. 5 is only for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 5, each partial subcarrier of AltBOC (1.5n, n) may be divided three times (ie, S = 3). In this case, 36 partial subcarriers may be set per chip.

Also, an auto correlation function of the AltBOC signal may be given by Equation 2.

In Equation 2, g(t) denotes the AltBOC signal, and P denotes the signal power. As shown in Equation 2, the autocorrelation function may be expressed as R(τ).

In this case, with reference to Equation 2, a correlation function for a partial subcarrier, that is, a partial correlation function can be derived. The partial correlation function for the AltBOC signal can be given by Equation 3.

In Equation 3, g(t) denotes an AltBOC signal, g _j (t) denotes a signal including a j-th partial subcarrier, and P denotes signal power. As shown in Equation 3, the j-th partial correlation function may be expressed as R _j (τ).

For the correlation function obtained through Equation 2 and Equation 3, a correlation operation such as Equation 4 may be applied.

Referring to Equation 4, the correlation operation represents only a positive result when both input values A and B are positive or negative, and only a result of 0 when A and B are different signs or one of the two values is 0. It has a property to show. That is, when A*B = 0, the result value of the correlation operation becomes 0. Using such a mathematical property, one or more peripheral peaks present in the correlation function for the AltBOC signal can be removed.

In particular, when the correlation operation of Equation 4 is applied to the auto-correlation function of the AltBOC signal obtained through Equation 2 and the partial correlation functions obtained through Equation 3, a very narrow width, that is, a very sharp main peak. And a correlation function with the surrounding peaks removed can be obtained.

In this specification, two additional correlation functions are obtained by selecting two partial correlation functions that are symmetrical to each other, and applying a correlation operation to each selected partial correlation function and an autocorrelation function of the AltBOC signal, and then obtaining two additional correlation functions. We propose a method of obtaining the final correlation function by performing correlation calculation on the correlation functions.

Here, the two additional correlation functions may be referred to as a first correlation function and a second correlation function, respectively. In addition, the final correlation function means a non-ambiguous correlation function to be used for tracking the AltBOC signal, and may be referred to as a third correlation function.

A receiving device that receives and tracks the AltBOC signal may track the AltBOC signal using the final correlation function obtained as described above. Hereinafter, the method proposed in the present specification as described above will be described in detail.

6 shows examples of correlation calculation results between an autocorrelation function and a partial correlation function to which the method proposed in the present specification can be applied. 6 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 6, it is assumed that an auto-correlation function and a partial correlation function for the AltBOC (1.5n, n) signal are used. In addition, in this case, it is assumed that the second partial correlation function and the 11th partial correlation function are used as two symmetrical partial correlation functions.

Specifically, (a) of FIG. 6 shows the result of applying the correlation operation between the autocorrelation function and the second partial correlation function for the AltBOC (1.5n, n) signal. Further, (b) of FIG. 6 shows the result of applying a correlation operation between the autocorrelation function and the 11th partial correlation function for the AltBOC(1.5n, n) signal.

In this case, if the correlation operation is applied to the combination result of FIG. 6A and the combination result of FIG. 6B, peripheral peaks present in the correlation function can be removed.

For example, if a correlation operation is performed on the result value of section 602 (i.e., section before -T _c /24) of FIG. 6(a) and the result value of section 606 of FIG. 6(b), the result is When it becomes 0, the surrounding peaks existing in section 602 of FIG. 6A can be removed. Similarly, when a correlation operation is performed on the result value of section 604 of FIG. 6(a) and section 608 of FIG. 6(b) (that is, the section after T _c /24), the result is 0 As a result, the surrounding peaks present in section 608 of FIG. 6B can be removed. In particular, in this case, a portion in which the value of the 602 section is 0, the portion in which the value of the 604 section, the 606 section, and the 608 section is 0 can be effectively used to remove the peripheral peak.

Through such a process, peripheral peaks present in the correlation functions are removed, and a correlation function (ie, a non-ambiguous correlation function) in which only the main peaks for tracking the AltBOC signal exist can be generated (or acquired).

Similarly, in the case of the AltBOC(n, n) signal (i.e., k = 1, S = 1), the correlation calculation result between the autocorrelation function of the AltBOC signal and the second partial correlation function, and the autocorrelation function of the AltBOC signal and 7 The unambiguous correlation function can be obtained by using the result of the correlation calculation between the second partial correlation functions. At this time, each correlation calculation result may be expressed as in Equation 5.

In Equation 5, CC ₁ (τ) represents the result of the correlation calculation between the autocorrelation function and the second partial correlation function, and CC ₂ (τ) represents the result of the correlation calculation between the autocorrelation function and the 7th partial correlation function.

In addition, in addition to the case where the k value is 1 and the S value is 1, it goes without saying that the CC1 and CC2 values may be calculated in the same or similar manner as shown in Equation 5. Specific examples for this are as follows.

For example, if k is 1.5 and S is 1 (that is, in the case of FIG. 2), a total of 12 partial subcarriers may exist in one chip, and 12 partial correlation functions may be generated accordingly. In this case, as in the case of FIG. 6, CC ₁ and CC ₂ may be generated by performing correlation calculations with the autocorrelation function of the AltBOC (1.5n, n) signal, respectively, by the second partial correlation function and the 11th partial correlation function. .

For another example, when k is 2 and S is 1 (ie, in the case of FIG. 3), a total of 16 partial subcarriers may exist in one chip, and 16 partial correlation functions may be generated accordingly. In this case, CC ₁ and CC ₂ may be generated by correlating the 2nd partial correlation function and the 15th partial correlation function with the autocorrelation function of the AltBOC(2n, n) signal, respectively.

For another example, when k is 1 and S is 2 (that is, when each partial subcarrier shown in FIG. 1 is divided into 2), a total of 16 partial subcarriers may exist in one chip, and thus 16 Partial correlation functions can be generated. In this case, CC ₁ and CC ₂ may be generated by correlating the 4th partial correlation function and the 13th partial correlation function with the autocorrelation function of the AltBOC(n, n) signal, respectively.

As another example, when k is 1.5 and S is 2 (that is, when each partial subcarrier shown in FIG. 2 is divided into 2), a total of 24 partial subcarriers may exist in one chip, and accordingly, 24 Partial correlation functions can be generated. In this case, CC ₁ and CC ₂ may be generated by correlating the 4th partial correlation function and the 21st partial correlation function with the autocorrelation function of the AltBOC(1.5n, n) signal, respectively.

For another example, when k is 2 and S is 2 (that is, when each partial subcarrier shown in FIG. 3 is divided into 2), a total of 32 partial subcarriers may exist in one chip, and accordingly, 32 Partial correlation functions can be generated. In this case, CC ₁ and CC ₂ may be generated by correlating the 4th partial correlation function and the 29th partial correlation function with the autocorrelation function of the AltBOC(2n, n) signal, respectively.

In order to generate a correlation function with good tracking performance of the AltBOC signal, it is necessary to use a combination (or combination) between specific partial correlation functions in each case, as in the above-described examples. This is, in order to create a correlation function from which the peripheral peaks are removed, the two partial correlation functions to be combined need to be symmetrical to each other, and to generate a high main peak, the combined peaks need to be overlapped.

Considering these points, when k is 1 and S is 1, possible partial correlation function combinations are (1st, 8th), (2nd, 7th), (3rd, 6th), (4th, 5th). In this case, in order to generate the narrowest peak, it may be desirable to use a combination of the zero-crossing point of the partial correlation function closest to zero (2nd, 7th). Similarly, if k is 1.5 and S is 1, it may be preferable to use the (2nd, 11th) combination, and when k is 2 and S is 1, it may be preferable to use the (2nd, 15th) combination. have.

In addition, at a value of 2 or more, a correlation operation between the partial correlation function and the autocorrelation function corresponding to a value that causes the zero-crossing point to be close to 0 in the group having the second value from the end of the subcarrier values is set to be performed. I can. For example, in the case of an AltBOC signal with k = 1.5 and S = 2, the (4th, 21st) combination is selected, and in the case of an AltBOC signal with k = 1.5 and S = 3, the (6th, 31st) combination Can be chosen.

In the case of selecting a combination as in the above-described examples, there is an advantage in that the narrowest main peak value can be obtained.

In consideration of the above-described examples, the formula obtained by generalizing Equation 5 to k and S may be the same as Equation 6.

For convenience of explanation of the correlation functions and to distinguish between the correlation functions, CC ₁ (τ) in Equation 6 may be referred to as a first correlation function, and CC ₂ (τ) may be referred to as a second correlation function. .

A method of generating a final correlation function, that is, an unambiguous correlation function, using the above-described first and second correlation functions may be as shown in Equation 7.

Referring to Equation 7, the non-ambiguous correlation function CC(τ) may be generated through a correlation operation (ie, an operation of Equation 4) between the first correlation function and the second correlation function. As described above, the non-ambiguous correlation function may mean a correlation function in which the width of the main peak is very narrow and all of the surrounding peaks are removed.

7 shows an example of a non-ambiguous correlation function to which the method proposed in the present specification can be applied. 7 is only for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 7, in the non-ambiguous correlation function, it can be seen that the width of the main peak is very narrow, the value of the peak (that is, the height of the peak) is large, and the peripheral peak is removed.

An apparatus for receiving and tracking the AltBOC signal can track the AltBOC signal with high tracking performance by using the unambiguous correlation function obtained according to the above-described procedures. That is, the corresponding device may obtain accurate location information for the AltBOC signal by using the unambiguous correlation function obtained according to the above-described procedures.

In order to apply the method proposed in the present specification to various AltBOC models, a generalized equation may be the same as in Equation 8.

Equation 8 can be applied irrespective of the value of k in the AltBOC(k*n, n) signal. In addition, as described above, Equation 8 may be applied to a signal calculated by dividing a subcarrier having each value S times. In this case, as the k value and the S value increase, a narrower width as desired and a sharp correlation function may be obtained.

8 shows an example of an autocorrelation function and an unambiguous correlation function to which the method proposed in the present specification can be applied. 8 is only for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 8, it is assumed that the method proposed in the present specification is applied regardless of the k value. In FIG. 8, an unambiguous correlation function corresponding to the case where the k value is 1, 1.5, or 2, respectively is shown.

As shown in FIG. 8, the autocorrelation function of the AltBOC signal includes a plurality of peripheral peaks, and the width of the main peak may be set to be wide. That is, when tracking the AltBOC signal, the probability of generating an error may be very high.

On the other hand, in the case of the correlation function (ie, non-ambiguous correlation function) proposed in the present specification, the peripheral peak is completely removed, and the width of the main peak may be set very narrow. In addition, the main peak value of the correlation function proposed in the present specification is set larger than the main peak value (ie, the main peak size) of the autocorrelation function.

This may mean that when the above-described method is used, a sharp correlation function is obtained for signal tracking, and high tracking performance can be supported. The above-described method may be equally applied to various AltBOC signals, and the width of the peak may decrease as the k value increases according to the signal model. For example, as shown in FIG. 8, the width of the peak when the k value is 2 is set smaller than that when the k value is 1.

9 shows an example of comparing an unambiguous correlation function to which the method proposed in this specification can be applied, a correlation function according to a conventional method, and an autocorrelation function. 9 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 9, the peripheral peak can be completely removed from the non-ambiguous correlation function proposed in the present specification.

In addition, the width of the peak of the non-ambiguous correlation function may be set to be narrower than the width of the peak of the correlation function according to the conventional method. For example, as shown in Fig. 9, the width of the peak of the correlation function according to the conventional method is T _c /6, whereas in the case of the proposed non-ambiguous correlation function, a narrower and sharper peak having a width of T _c /12 is generated. Can be.

As described above, the present specification proposes a method of selecting and designing an optimal combination so as to have the sharpest correlation function when partial subcarriers are divided equally. The non-ambiguous correlation function according to the difference in the number of divisions (ie, S values) for the partial subcarriers may appear as shown in FIGS. 10 and 11.

10 shows another example of comparing an unambiguous correlation function to which the method proposed in the present specification can be applied, a correlation function according to a conventional method, and an autocorrelation function. In addition, FIG. 11 shows another example of comparing an unambiguous correlation function to which the method proposed in the present specification can be applied, a correlation function according to a conventional method, and an autocorrelation function. 10 and 11 are merely for convenience of description and do not limit the scope of the present invention.

Referring to FIGS. 10 and 11, it is assumed that one partial subcarrier is divided twice and three times (ie, S = 2, S = 3). Even in this case, the peak of the non-ambiguous correlation function proposed in the present specification may be narrow and sharply generated as compared with the conventional method. That is, regardless of the number of divisions, the method proposed in the present specification has the advantage of obtaining a narrower width and a sharper main peak compared to the conventional method.

12 is a flowchart illustrating an operation of a reception device tracking an AltBOC signal to which the method proposed in the present specification can be applied. 12 is merely for convenience of description and does not limit the scope of the present invention.

In step S1205, the receiving device may receive an AltBOC signal.

In step S1210, the receiving device may divide the subcarriers of the received AltBOC signal into a plurality of partial subcarriers. In this case, the plurality of partial subcarriers may include a first partial subcarrier and a second partial subcarrier.

In step S1215, the receiving device may generate a first correlation function (eg, CC ₁ (τ)) by calculating an auto-correlation function for the AltBOC signal and a first partial correlation function for the first partial subcarrier. Here, the operation may mean the correlation operation of Equation 4 described above.

In step S1220, the receiving device may generate a second correlation function (eg, CC ₂ (τ)) by calculating an auto-correlation function for the AltBOC signal and a second partial correlation function for the second partial subcarrier. Here, the operation may mean the correlation operation of Equation 4 described above.

In this case, steps S1215 and S1220 may be performed simultaneously or may be performed regardless of the order.

Thereafter, in step S1225, the receiving device may generate a third correlation function (eg, a non-ambiguous correlation function) by calculating the first correlation function and the second correlation function. Here, the operation may mean the correlation operation of Equation 4 described above.

Thereafter, in step S1230, the receiving device may track the AltBOC signal using the third correlation function. For example, the receiving device may track the AltBOC signal based on the location information of the AltBOC signal obtained using the third correlation function.

In the case of the above-described method, when tracking the AltBOC signal, a non-ambiguous correlation function is generated by completely removing the peripheral peaks, and can be applied to all k values, and performance is further improved as the k value increases. In addition, the method may have superior performance than the conventional method under the condition that partial subcarriers are divided by the same number of times, that is, the same complexity. Also, through this method, the narrowest and sharpest peak is generated, and through this, good signal tracking performance can be obtained.

13 shows an example of a block diagram showing the configuration of a reception device to which the method proposed in the present specification can be applied. 13 is merely for convenience of description and does not limit the scope of the present invention.

The receiving device 1300 for tracking the AltBOC signal may include a transceiver 1310 for receiving an AltBOC signal and a controller 1320 for processing the received AltBOC signal. In this case, the controller 1320 may include a correlation function generation unit 1330 and/or an AltBOC tracking unit 1340. The correlation function generation unit 1330 and/or the AltBOC tracking unit 1340 are classified for convenience of description and may correspond to some components of the controller 1320 or 1320.

In this case, the transmission/reception unit 1310 may receive the AltBOC signal according to the method described above.

In addition, the controller 1320 may divide the subcarriers of the received AltBOC signal into a plurality of partial subcarriers according to the above-described method. In addition, the control unit 1320 generates a first correlation function (eg, CC ₁ (τ)) by calculating an autocorrelation function for the AltBOC signal and a first partial correlation function for the first partial subcarrier, and A second correlation function (eg, CC ₂ (τ)) may be generated by calculating the autocorrelation function and the second partial correlation function for the second partial subcarrier. In addition, the control unit 1320 may calculate a first correlation function and a second correlation function to generate a third correlation function (eg, a non-ambiguous correlation function), and track the AltBOC signal using the third correlation function. .

The embodiments described above are those in which components and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, it is also possible to construct an embodiment of the present invention by combining some components and/or features. The order of operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is apparent that claims that do not have an explicit citation relationship in the claims may be combined to constitute an embodiment or may be included as a new claim by amendment after filing.

It is obvious to a person skilled in the art that the present invention can be embodied in other specific forms without departing from the essential features of the present invention. Therefore, the above detailed description should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

A method of tracking an alternative binary offset carrier in the wireless communication system of the present invention has been mainly described for a case in which an alternative binary offset carrier signal is applied, but may be applied to various other signals.

Claims (14)

In the method for the receiving device to track an alternative binary offset carrier (AltBOC) signal,
Receiving the AltBOC signal;
The process of dividing a subcarrier of the received AltBOC signal into a plurality of partial subcarriers, and the plurality of partial subcarriers include a first partial subcarrier and a second partial subcarrier,
Generating a first correlation function by calculating an auto-correlation function for the AltBOC signal and a first partial correlation function for the first partial subcarrier;
Generating a second correlation function by calculating an auto-correlation function for the AltBOC signal and a second partial correlation function for the second partial subcarrier;
A process of generating a third correlation function by performing a correlation calculation between the first correlation function and the second correlation function, and
And tracking the AltBOC signal by using the third correlation function.
The method of claim 1,
The AltBOC signal tracking method, wherein the first partial subcarrier and the second partial subcarrier have a symmetric relationship.
The method of claim 2,
The first partial subcarrier and the second partial subcarrier correspond to two partial subcarriers having a zero crossing point of a partial correlation function among the plurality of partial subcarriers that are closest to a zero value.
The method of claim 1,
The third correlation function is an AltBOC signal tracking method, characterized in that the first correlation function and a correlation function in which a peripheral peak is removed by using the first correlation function.
The method of claim 1,
The first correlation function, the second correlation function, and the third correlation function are generated by using a correlation operation corresponding to the following equation.

The method of claim 1,
The first partial correlation function and the second partial correlation function are generated using an equation as follows.

(Rj(τ) is the j-th partial correlation function, gj(t) is the signal including the j-th partial subcarrier, and g(t) is the received AltBOC signal)
The method of claim 5,
The first correlation function and the second correlation function, AltBOC signal tracking method, characterized in that generated using the following equation.

(CC1(τ) is the first correlation function, CC2(τ) is the second correlation function, R(τ) is the autocorrelation function, Rj(τ) is the j-th partial correlation function, and k is the pseudo-random noise code. The ratio between the chip period of and the subcarrier, S is the number of divisions for the existing partial subcarriers of the AltBOC signal)
In a receiving apparatus for tracking an alternative binary offset carrier (AltBOC) signal,
A transceiver for receiving an AltBOC signal, and
And a control unit processing the received AltBOC signal,
The control unit,
Splitting a subcarrier of the received AltBOC signal into a plurality of partial subcarriers, the plurality of partial subcarriers, including a first partial subcarrier and a second partial subcarrier,
A first correlation function is generated by calculating an autocorrelation function for the AltBOC signal and a first partial correlation function for the first partial subcarrier,
A second correlation function is generated by calculating an autocorrelation function for the AltBOC signal and a second partial correlation function for the second partial subcarrier,
The first correlation function and the second correlation function are correlated with each other to generate a third correlation function,
And tracking the AltBOC signal by using the third correlation function.
The method of claim 8,
The receiving device, wherein the first partial subcarrier and the second partial subcarrier have a symmetric relationship.
The method of claim 9,
And the first partial subcarrier and the second partial subcarrier correspond to two partial subcarriers having a zero crossing point of a partial correlation function closest to a zero value among the plurality of partial subcarriers.
The method of claim 8,
And the third correlation function is a correlation function in which a peripheral peak is removed by using the first correlation function and the first correlation function.
The method of claim 8,
The first correlation function, the second correlation function, and the third correlation function are generated by using a correlation operation corresponding to the following equation.

The method of claim 8,
The first partial correlation function and the second partial correlation function are generated using the following equation.

(Rj(τ) is the j-th partial correlation function, gj(t) is the signal including the j-th partial subcarrier, and g(t) is the received AltBOC signal)
The method of claim 12,
The receiving device, characterized in that the first correlation function and the second correlation function are generated using the following equation.

(CC1(τ) is the first correlation function, CC2(τ) is the second correlation function, R(τ) is the autocorrelation function, Rj(τ) is the j-th partial correlation function, and k is the pseudo-random noise code. The ratio between the chip period of and the subcarrier, S is the number of divisions for the existing partial subcarriers of the AltBOC signal)

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