KR20140086575A - Multi beam former apparatus and method using polyphase interpolation filter - Google Patents

Abstract

The present invention relates to an apparatus and a method for multi-beam focusing using a polyphase interpolation filter. The apparatus comprises a receiving unit, in which a plurality of channels arranged in a shape of an array receive RF data; an ADC unit which converts the RF data received by each channel from an analog state to a digital state; a channel memory unit which stores the RF data converted to the digital state into each channel; a data extraction unit which extracts the RF data in a coarse delay state from the channel memory unit; a delay value calculation unit which calculates an accurate delay value for the extracted RF data; a polyphase interpolation filter unit which interpolates the accurate delay value; and a beam focus unit which focuses a beam signal from the RF data, in which the accurate delay value is interpolated. According to the described configuration, the apparatus and the method for multi-beam focusing using a polyphase interpolation filter according to the present invention may improve the accuracy of beam focusing by calculating the accurate delay of the RF data without increasing the operating frequency of the system.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-beam focusing apparatus and method using a polyphase interpolation filter,

The present invention relates to a multi-beam focusing apparatus and method using a polyphase interpolation filter, and more particularly, to a multi-beam focusing apparatus and method using a polyphase interpolation filter capable of improving accuracy of beam focusing while simplifying hardware complexity.

With the development of ultrasound imaging technology, such ultrasound imaging technology is widely used in the medical field. Such ultrasonic imaging technology refers to a technique of acquiring an intuitive figure through reflected waves or transmitted waves in all or a part of an object.

A general beam focusing method of such an ultrasound imaging technique converts an ultrasound signal reflected from the object into an electric signal and expresses it as an image after transmitting the ultrasound signal to the object. At this time, the distance of the reflected ultrasound signal to the target object may be determined, and the characteristic of the target object may be determined based on the received intensity of the reflected ultrasound signal.

FIG. 1 is a view illustrating a beam focusing method of a general ultrasound image.

As shown in FIG. 1, a circularly radiated ultrasonic signal arriving at a pixel point on a scan line arrives at the array transformer, where the ultrasonic signals reaching the array transformer have different delay times Since the signal arriving at the array transformer through the medium has converged, a signal obtained by compensating the phase difference through a variable time delay process is constituted by one signal.

In particular, in a two-dimensional image, the resolution of the ultrasound imaging apparatus can be divided into an axial resolution parallel to the direction of the ultrasonic signal and a lateral resolution perpendicular thereto. At this time, the lateral resolution increases as the beam width of the ultrasonic signal becomes narrower. Therefore, in order to improve the quality of the image, the ultrasound signal should be focused at a desired position. Previously, beam focusing was done through an acoustic lens like a magnifying glass. However, in most imaging devices, there is a method of arranging ultrasonic transducers in an array form and assigning time delays to the respective transducers to electrically concentrate them Is used.

FIG. 2 is a diagram showing an interchannel reception delay at a focal point. FIG.

As shown in FIG. 2, channel 1 to channel 8 located on the left side of the scan line are symmetrical with respect to channels 16 to 9 located on the right side of the scan line, respectively, ) To the symmetrical left and right channels are equal to each other.

Accordingly, after examining only the contents corresponding to the channels 1 to 8, the interpretation can be extended to all the channels, that is, from channel 1 to channel 16. As a result, the RF signal reflected from the focal point is transmitted toward all the channels. When the RF signal toward the channel 8 closest to the focal point reaches the position (a), that is, t = t1 The RF signal directed to the channel 1 located at the farthest distance from the focusing point does not approach the channel 1 but reaches a position (b) which is a position spaced apart by a certain distance.

As a result, since each channel can not receive the ultrasonic signals reflected from the beam focusing point at the same time, the accuracy of beam focusing is reduced.

As described above, a multi-beam focusing apparatus and method using a polyphase interpolation filter will be described as follows.

Prior Art 1 is Korean Patent Laid-Open Publication No. 2008-0113751 (December 31, 2008), which relates to a multi-channel beam focusing apparatus and method using a single interpolator. This prior art 1 includes a memory 100 for storing data sampled in each channel and a delay calculator 200 for dynamically calculating a time delay to arrive at each channel. A data block (300) configured to divide data to be multiplied by a filter coefficient in each channel into one block using data stored in the memory (100); A path selection and serial adder 400 for adding block data stored in the data block 300 in series through each channel to obtain a block sum; A single interpolation filter 500 for multiplying a block sum calculated through the path selection and serial adder 400 by a filter coefficient to output a beam focusing output; And a control unit. Accordingly, while maintaining the performance and merits of a conventional interpolation beam focusing apparatus capable of obtaining a small error and a high resolution, the number of interpolators and the number of components to be used is reduced to a low level, thereby achieving low hardware complexity, Power, lightweight, small-sized ultrasound imaging apparatus.

Prior Art 2 is Korean Patent Laid-Open Publication No. 2011-0096902 (Aug. 31, 2011), which relates to a method and apparatus for generating a multi-scan line. The prior art 2 includes a step of selecting a maximum value of the channel constant delay time corresponding to each of the plurality of scanning lines; Storing the channel data by shifting the register every time the selected maximum value is changed; Selecting the stored channel data based on a difference between the selected maximum value and a channel constant delay time corresponding to each of the plurality of scan lines; And synthesizing the selected channel data for each scanning line. Accordingly, it is possible to increase the frame rate of the image or increase the scanning line resolution while maintaining the same frame rate.

In order to solve the problems of the prior art as described above, the present invention provides a multi-beam focusing apparatus and method using a polyphase interpolation filter capable of improving precision of beam focusing by enabling precision delays without increasing the system operating frequency .

According to an aspect of the present invention, there is provided a multibeam focusing apparatus using a polyphase interpolation filter, the multibeam focusing apparatus including: a receiver having a plurality of channels arranged in an array for receiving RF data; An ADC unit for converting the RF data received for each channel from an analog state to a digital state; A channel memory unit for storing the RF data converted into the digital state for each channel; A data extracting unit for extracting RF data in a coarse delay state from the channel memory unit; A delay value operation unit for calculating a fine delay value for the extracted RF data; A polyphase interpolation filter unit for interpolating the fine delay value; And a beam focusing unit for focusing the beam signal from the interpolated RF data.

The delay value calculator may further include a delay value storage unit for storing the fine delay value calculated from the delay value calculation unit in a lookup table.

The multiphase interpolation filter unit may further include a polyphase interpolation filter unit for selecting the polyphase interpolation filter coefficient corresponding to the fine delay value calculated from the delay value calculation unit and interpolating the fine delay value using the selected polyphase interpolation filter coefficient.

Particularly, it may include a polyphase interpolation filter unit comprising a finite impulse response filter.

More preferably, an address difference between the current coarse delay index beam of the RF data and the next coarse delay index beam is calculated to obtain a coarse random value, and the coarse delayed RF data is extracted from the channel memory unit And a data extracting unit.

And a data extracting unit for storing the RF data of the coarse delay state extracted from the channel memory unit in a buffer provided therein.

More preferably, the delay value calculation unit may calculate a fine delay value by calculating an address difference between the current fine delay index beam and the next fine delay index beam with respect to the RF data in the coarse delay state.

In particular, when all of the RF data in the buffer is stored, the beam focusing unit may include a beam focusing unit for focusing the beam signal from the stored RF data.

According to another aspect of the present invention, there is provided a multi-beam focusing method using a polyphase interpolation filter, comprising: receiving RF data from a plurality of channels arranged in an array; Converting the RF data received by the ADC unit for each channel from an analog state to a digital state; The channel memory unit dividing the RF data converted into the digital state by channels and storing the separated RF data; Extracting RF data in a coarse delay state among RF data stored in the channel memory unit; Calculating a fine delay value for the RF data extracted from the data extracting unit by the delay value calculating unit; Interpolating the fine delay value by a polyphase interpolation filter unit; And focusing the beam signal from the RF data with the fine delay value interpolated by the beam focusing section.

More preferably, after performing the step of calculating the fine delay value, storing the fine delay value calculated in the look-up table before performing the step of interpolating the fine delay value .

Selecting a polyphase interpolation filter coefficient corresponding to the calculated fine delay value; And interpolating the fine delay value using the selected polyphase interpolation filter coefficient.

More preferably, an address difference between the current coarse delay index beam of the RF data and the next coarse delay index beam is calculated to obtain a coarse random value, and the coarse delayed RF data is extracted from the channel memory unit And extracting the RF data.

In particular, the method may further include extracting the RF data further including storing the extracted RF data in a buffer of the data extracting unit.

More preferably, the step of calculating the address difference of the channel memory unit between the current fine delay index beam and the next fine delay index beam with respect to the RF data in the coarse delay state and calculating the fine delay value for calculating the fine delay value .

And a beam focusing step of focusing the beam signal from the RF data stored in the buffer of the data extracting unit.

The multi-beam focusing apparatus and method using the polyphase interpolation filter according to the present invention can improve accuracy of beam focusing through precision delay calculation of RF data without increasing the operating frequency of the system.

Also, since the multi-beam focusing apparatus and method using the polyphase interpolation filter of the present invention interpolates precision delay values using the coefficients of the polyphase interpolation filter, the effect of preventing the hardware configuration for the delay value calculation from being complicated have. Thus, it is possible to manufacture a portable image device with low power consumption, light weight, and small size.

FIG. 1 is a view illustrating a beam focusing method of a general ultrasound image.
FIG. 2 is a diagram showing an interchannel reception delay at a focal point. FIG.
3 is a graph illustrating a channel memory unit when the system operating frequency is 160 MHz.
4 is a graph showing a channel memory unit when the system operating frequency is 40 MHz.
5 is a block diagram of a multi-beam focusing apparatus using a polyphase interpolation filter according to an embodiment of the present invention.
6 is a flowchart of a multi-beam focusing method using a polyphase interpolation filter according to another embodiment of the present invention.
7 is a graph showing a fine delay value of RF data according to the present invention.
FIG. 8 is a diagram illustrating a process of calculating a coarse value and a fine delay value of RF data.
9 is a block diagram of a multi-beam focusing apparatus using a polyphase interpolation filter according to another embodiment of the present invention.
10 is a block diagram of a multi-beam focusing apparatus using a polyphase interpolation filter according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, the present invention will be described in detail with reference to preferred embodiments and accompanying drawings, which will be easily understood by those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

First, before describing the present invention, the beam focusing process will be briefly described.

2 is a diagram showing an interchannel reception delay at a focal point.

As shown in Fig. 2, the RF signal reflected from the focal point is transmitted toward all the channels. At this time, when the RF signal toward the channel 8 that is closest to the focal point reaches the position (a), that is, t = t1, the RF from the focal point to the channel 1 The signal reaches position (b).

Thereafter, when t = t2, a predetermined time is delayed, the RF signal directed to the channel 1 reaches the position (c). Accordingly, the RF signal received from the focusing point to each channel passes through the ADC unit formed for each channel, and is then stored in the channel memory unit.

At this time, it is assumed that the time until the ADC unit is stored in the channel memory unit is ignored for each channel, and the RF signal directed from the focusing point to the channel is stored in the channel memory unit as it reaches the channel.

When the RF signal from the focal point to the channel 8 reaches t = t1, the RF signal reflected at the focal point is stored in the memory of the channel 8. However, since the RF signal from the focal point to the channel 1 is still at position (b), it is known that the value stored in the channel memory of the channel 1 at time t = t1 is not the RF signal reflected at the focal point .

Thereafter, when a predetermined time is delayed, that is, t = t2, the value stored in the channel memory unit of the channel 1 becomes the RF signal directed from the focal point to the channel 1.

That is, the basic concept of beam focusing is to extract and add only RF data (signals) reflected at specific focusing points in all channel memory units.

As described above, in the channel 8 memory, RF data stored at time t = t1 is extracted, and RF data stored at time t = t2 is extracted from the channel 1 memory. At this time, it is assumed that the number of channels is 16, and the converter transmission frequency is 10 MHz.

3 is a graph illustrating a channel memory unit when the system operating frequency is 160 MHz.

As shown in FIG. 3, the horizontal direction of the graph represents a channel and the vertical direction represents time, and RF data stored in each channel memory unit can be known. At this time, since the system operating frequency is 160 MHz,? 1 is 6.25 ns.

In addition, the solid line passing through the circles in the graph is an ideal channel delay curve at a specific focal point, which represents the time delay in which the RF signal reflected at a particular focal point reaches each channel when the channel spacing and? Are very small. At this time, the circle represents the delay of the RF data of the channel memory unit at the specific focusing point when the RF data reflected at the specific focusing point is sampled every 6.25ns? 1 interval and stored in the channel memory unit.

Accordingly, it is ideal to use RF data corresponding to an ideal channel delay curve for beam focusing. In practice, however, the RF data of the original sampled at the channel interval and the system operating frequency is extracted and beam focusing is performed. Also, since the channel spacing is fixed by the converter, it can be seen that the resolution of the beam focusing is actually determined by the system operating frequency.

4 is a graph showing a channel memory unit when the system operating frequency is 40 MHz.

As shown in Fig. 4, the system operating frequency is 40 MHz, so? 2 is 25 ns. Compared with the graph shown in FIG. 3, the ideal channel delay curve is the same, but the resolution of the vertical axis is more accurate in FIG. In addition, finely sampling an ideal delay curve as in the circle of Fig. 3 is referred to as a fine delay, and an ideal delay curve as shown in Fig. 4 is called a coarse delay.

In order to achieve such a fine delay, the analog RF signal should be converted into digital data and stored in a memory in the ADC unit at an operating frequency of 160 MHz, which is 16 times the converter transmission frequency as in the case of FIG.

Hereinafter, a multi-beam focusing apparatus and method using the polyphase interpolation filter of the present invention will be described in detail with reference to FIG.

5 is a block diagram of a multi-beam focusing apparatus using a polyphase interpolation filter according to an embodiment of the present invention.

5, the multi-beam focusing apparatus 100 using the polyphase interpolation filter according to the present invention includes a receiving unit 110, an ADC unit 120, a channel memory unit 130, a data extracting unit 140, Value calculating unit 150, a delay value storing unit 160, a polyphase interpolation filter unit 170, and a beam focusing unit 180.

The receiving unit 110 includes a plurality of channels arranged in an array, and receives RF signals through the channels.

The ADC unit 120 converts RF signals received for each channel from an analog state to a digital state to generate RF data.

The channel memory unit 130 stores the RF data converted into the digital state for each channel.

The data extracting unit 140 calculates an address difference of the channel memory unit between a current coarse delay index beam of the RF data and a next coarse delay index beam to obtain a coarse value of the RF data And extracts the RF data in the coarse delay state from the channel memory unit 130. [ The data extracting unit 140 stores the RF data in the coarse delay state extracted from the channel memory unit 130 in a buffer provided therein.

The delay value calculator 150 calculates a delay value between the current fine delay index beam and the next fine delay index beam for the RF data in the coarse delay state extracted from the data extractor 140, And calculates the fine delay value.

The delay value storage unit 160 stores the fine delay value calculated and received from the delay value calculation unit 150 in a lookup table.

The polyphase interpolation filter unit 170 selects a polyphase interpolation filter coefficient corresponding to the fine delay value calculated from the delay value calculator 150 and interpolates the fine delay value using the selected polyphase interpolation filter coefficient. At this time, the polyphase interpolation filter unit 170 includes a finite impulse response filter.

The beam focusing unit 180 focuses the beam signal from the interpolated RF data, and when the RF data in the buffer of the data extracting unit is all stored, the beam signal is collected from the stored RF data.

Hereinafter, a multi-beam focusing method using a polyphase interpolation filter will be described in detail with reference to FIG.

6 is a flowchart of a multi-beam focusing method using a polyphase interpolation filter according to another embodiment of the present invention.

As shown in FIG. 6, in the multibeam focusing method using the polyphase interpolation filter according to the present invention, a plurality of channels arranged in an array form receive analog RF signals (S210).

The ADC unit converts an RF signal received for each channel from an analog state to a digital state to generate RF data (S220).

Thereafter, the channel memory unit divides the RF data converted into the digital state for each channel and stores the separated RF data (S230).

The data extracting unit extracts RF data in a coarse delay state from the RF data stored in the channel memory unit (S240). In the RF data extracting step, the data extracting unit calculates an address difference between the current coarse delay index beam and the next coarse delay index beam of the RF data to obtain a coarse random value, And extracts the data from the channel memory unit and stores the extracted data in a buffer provided in the data extracting unit.

The delay value operation unit calculates a fine delay value for the RF data extracted from the data extraction unit (S250). The fine delay value calculation process computes a fine delay value by calculating an address difference of the channel memory unit between the current fine delay index beam and the next fine delay index beam with respect to the RF data in the coarse delay state.

At this time, the delay value storage unit stores the fine delay value calculated from the delay value calculation unit in a look-up table (S260).

Then, a polyphase interpolation filter unit interpolates the fine delay value. The interpolation process of the fine delay value will be described in more detail. In step S270, a polyphase interpolation filter coefficient corresponding to the calculated fine delay value is selected.

Next, the precision delay value is interpolated using the selected polyphase interpolation filter coefficient (S280).

Accordingly, the beam focusing unit concentrates the beam signal from the RF data interpolating the fine delay value (S290). That is, the beam signal is collected from the RF data stored in the buffer of the data extracting unit.

7 is a graph showing a fine delay value of RF data according to the present invention.

As shown in FIG. 7, since the RF data in the fine delay state shown in FIG. 3 is calculated using the RF data in the coarse delay state shown in FIG. 4, only the data selected for each channel is compared. same.

FIG. 8 is a diagram illustrating a process of calculating a coarse value and a fine delay value of RF data.

As shown in FIG. 8, data including all the data groups to be used for multi-beam focusing are updated from the channel memory unit to the data extraction unit for each clock of the system. The data extracting unit extracts the RF data group to be used for the polyphase interpolation filter of the beam 1 based on the coarse delay index beam 1 calculated by the delay value calculator. At this time, since the memory address difference between the coarse delay index beam 1 and the coarse delay index beam 2 is not large, the data extracting unit extracts RF data to be used in the polyphase interpolation filter by using the difference value between the coarse delay index beams. Thereafter, the precision delay value is calculated using the fine delay index beam difference value between the fine delay index beam 1 and the fine delay index beam 2 calculated in the delay value calculation unit of the polyphase interpolation filter unit, and the beam 2 And selects the coefficient to be used for the polyphase interpolation filter of FIG.

As a result, the delay value operation unit can calculate the coarse delay difference value and the fine delay value by operating the difference between the coarse delay index beam and the fine delay index beam to simplify the hardware structure for calculating the coarse delay and the fine delay, The index difference value and the fine delay index difference value can be implemented by adding a parameter register received from the host to calculate the delay value.

9 is a block diagram of a multi-beam focusing apparatus using a polyphase interpolation filter according to another embodiment of the present invention.

As shown in FIG. 9, the delay value operation unit may calculate a fine delay value, or a previously calculated delay value may be stored in a lookup table (LUT).

The coefficient to be used in the polyphase interpolation filter is selected through the precision delay index calculated in the delay value calculation unit or the LUT type delay value table. The coarse delay index computed in the delay value calculator or the LUT scheme is read from the channel memory unit and stored in the data extraction unit to prepare RF data to be used in the polyphase interpolation filter unit.

In particular, since the address of the channel memory unit updated every clock of the system does not exceed 1, when the RF data used for the polyphase interpolation filter is sufficiently filled in the buffer of the data extracting unit in consideration of the multi-beam, beam focusing is performed thereafter. As a result, if waiting for the RF data to be filled in the buffer of the data extracting unit, the updating of the RF data of the data extracting unit for each multi-beam per clock of the system does not exceed the maximum of 1, .

10 is a block diagram of a multi-beam focusing apparatus using a polyphase interpolation filter according to another embodiment of the present invention.

As shown in FIG. 10, when the capacity of the usable channel memory unit is sufficient and the hardware integrated capacity is sufficient, the buffer capacity of the data extracting unit is minimized, and the channel memory unit is used separately for each of the multi- Be able to implement the beam. That is, in this case, instead of the coarse delay index difference value and the fine delay index difference value used in FIG. 9, the RF data group is extracted by accessing the channel memory unit of the corresponding beam with the coarse delay index and fine precision index for all beams. do.

The multi-beam focusing apparatus and method using the polyphase interpolation filter according to the present invention can improve accuracy of beam focusing through precision delay calculation of RF data without increasing the operating frequency of the system.

Also, since the multi-beam focusing apparatus and method using the polyphase interpolation filter of the present invention interpolates precision delay values using the coefficients of the polyphase interpolation filter, the effect of preventing the hardware configuration for the delay value calculation from being complicated have. Thus, it is possible to manufacture a portable image device with low power consumption, light weight, and small size.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Do.

110: Receiver 120: ADC
130: Channel memory unit 140: Data extraction unit
150: delay value arithmetic unit 160: delay value storage unit
170: polyphase interpolation filter unit 180: beam focusing unit

Claims (16)

A receiver having a plurality of channels arranged in an array for receiving RF data;
An ADC unit for converting the RF data received for each channel from an analog state to a digital state;
A channel memory unit for storing the RF data converted into the digital state for each channel;
A data extracting unit for extracting RF data in a coarse delay state from the channel memory unit;
A delay value operation unit for calculating a fine delay value for the extracted RF data;
A polyphase interpolation filter unit for interpolating the fine delay value; And
A beam focusing unit for focusing the beam signal from the interpolated RF data;
And a multibeam interpolation filter including the multibeam interpolation filter.
The method according to claim 1,
A delay value storage unit for storing the fine delay value calculated by the delay value calculation unit in a lookup table;
Wherein the multi-beam interpolating filter is a multi-beam interpolating filter.
The method according to claim 1,
The polyphase interpolation filter unit
Wherein the multi-phase interpolating filter selects a polyphase interpolation filter coefficient corresponding to the precision delay value calculated from the delay value calculating unit, and interpolates the fine delay value using the selected polyphase interpolation filter coefficient.
The method according to claim 1,
The polyphase interpolation filter unit
And a finite impulse response filter (Finite Impulse Response Filter).
The method according to claim 1,
The data extracting unit
Wherein the RF data of the coarse delayed state is extracted from the channel memory unit by calculating an address difference between the current coarse delay index beam of the RF data and the next coarse delay index beam in the channel memory unit, Multibeam focusing system using polyphase interpolation filter.
6. The method of claim 5,
The data extracting unit
Wherein the RF data of the coarse delay state extracted from the channel memory unit is stored in a buffer provided in the multi-beam interpolating filter.
The method according to claim 1,
The delay value calculation unit
And calculates a precision delay value by calculating an address difference of the channel memory unit between the current fine delay index beam and the next fine delay index beam with respect to the RF data in the coarse delay state.
The method according to claim 6,
The beam focusing unit
Wherein when the RF data in the buffer of the data extracting unit is all stored, the beam signal is concentrated from the stored RF data.
The method comprising: receiving RF data from a plurality of channels arranged in an array;
Converting the RF data received by the ADC unit for each channel from an analog state to a digital state;
The channel memory unit dividing the RF data converted into the digital state by channels and storing the separated RF data;
Extracting RF data in a coarse delay state among RF data stored in the channel memory unit;
Calculating a fine delay value for the RF data extracted from the data extracting unit by the delay value calculating unit;
Interpolating the fine delay value by a polyphase interpolation filter unit; And
The beam focusing unit concentrating the beam signal from the interpolated RF data with the fine delay value;
And a multibeam interpolation filter including the multibeam interpolation filter.
10. The method of claim 9,
After performing the step of calculating the fine delay value, before performing the step of interpolating the fine delay value,
Storing the calculated fine delay value in a look-up table;
Wherein the multi-beam interpolating filter is a multi-beam interpolating filter.
10. The method of claim 9,
Interpolating the fine delay value comprises:
Selecting a polyphase interpolation filter coefficient corresponding to the calculated fine delay value; And
Interpolating the fine delay value using a selected polyphase interpolation filter coefficient;
Wherein the multi-beam interpolating filter is a multi-beam interpolating filter.
10. The method of claim 9,
The step of extracting the RF data
Wherein the RF data of the coarse delayed state is extracted from the channel memory unit by calculating an address difference between the current coarse delay index beam of the RF data and the next coarse delay index beam in the channel memory unit, Multi - beam focusing method using polyphase interpolation filter.
13. The method of claim 12,
The step of extracting the RF data
And storing the extracted RF data in a buffer of the data extracting unit.
10. The method of claim 9,
The step of calculating the fine delay value
And a precision delay value is calculated by calculating an address difference of the channel memory unit between the current fine delay index beam and the next fine delay index beam with respect to the RF data in the coarse delay state. Way.
14. The method of claim 13,
The beam focusing step
And the beam signal is concentrated from the RF data stored in the buffer of the data extracting unit.
A computer-readable recording medium on which a program for executing a method according to any one of claims 9 to 15 is recorded.

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