KR100785055B1 - Method for quantitative characteristic analysis of direction finding site - Google Patents

Abstract

A method for analyzing quantitative characteristics of a direction finding site is provided to accurately find a most proper location for the direction finding site by using the quantitative characteristics of candidate locations. A data transmitter for analyzing quantitative characteristics of a direction finding site includes a modulator(10), an amplifier(12) and a transmission antenna(14). The modulator receives data made of the same symbols and modulates the received data, such that constant constellation coordinates are marked on a constellation used for analyzing a channel environment of the direction finding site. The amplifier amplifies the data, which is modulated in the modulator. The transmission antenna transmits the amplified data.

Description

Quantitative Characterization Method of Direction Detection Site {METHOD FOR QUANTITATIVE CHARACTERISTIC ANALYSIS OF DIRECTION FINDING SITE}

1 is a block diagram schematically illustrating a transmitter model for quantitative characterization of a direction detection test site according to an embodiment of the present invention.

2 is a schematic block diagram of a receiver model for quantitative characterization of a directional detection test site in accordance with one embodiment of the present invention;

3 is a mapping table of Quadrature Phase Shift Keying (QPSK).

4 is a constellation diagram of QPSK.

<Explanation of symbols for the main parts of the drawings>

10 modulator 12 amplifier part

14: transmitting antenna 20: receiving antenna

22: low noise amplifier 24: demodulator

26: spectrum analysis unit 28: constellation diagram

The present invention relates to a method for quantitative characterization of a direction detection site, and more particularly, to a method for quantitative characterization of a direction detection site using N-PSK (Phase Shift Keying) or N-QAM (Quadrature Amplitude Modulation) constellation analysis. It relates to a data transmission method and a data transmission and reception method in the characteristic analysis.

In general, direction detection methods are classified into amplitude comparison methods and phase comparison methods. In low bands such as the HF (High Frequency) band, the Watson-watt method using amplitude comparison is mainly used, and CVDF (Correlation Vector) using phase comparison in the VHF / UHF (Very High Frequency / Ulata High Frequency) band Direction Finding) is widely used.

In order to accurately detect the detected signal, less unnecessary signals should be received near the detected signal, and the reflected wave of the magnetic signal should be less. Also, in the design of the direction finding system, the magnitude and phase of the signal received by the antenna changes little by little while reaching the direction finding system, which degrades the performance of the direction finding system. For this reason, calibration is essential to develop an accurate direction detection system and calibration should be done in the cleanest possible environment.

The term “clean environment” is a term that is quite difficult to define. Generally, it is a good direction test site. It has six conditions: 1) constant surface and high altitude, 2) constant surface conductivity and water content, 3) wire, Areas where conductors are not laid on the ground, such as telephone lines or antennas, 4) Areas without public utilities lines such as pipelines, water, electricity, and telephones, 5) Areas without fences made of wire lines, 6) Buildings, bridges, This includes areas without railroads, water towers, chimneys, tall trees, rivers, streams, lakes, and shorelines.

However, it is very difficult to find an area that satisfies all six conditions in Korean terrain. That is, the conventional qualitative method is difficult to determine the suitability of the direction detection test site as described above.

Therefore, although the above conditions are not satisfied, a quantitative method is urgently needed to select a better direction detection test site.

Accordingly, an object of the present invention is to provide a method for quantitative characterization of a direction detection site for improving the difficulty caused by a qualitative method in determining the suitability of a conventional direction detection site.

According to an aspect of the present invention, a data transmitter for quantitative characterization of a direction detection test site is configured with the same symbol so that the coordinates of the same constellation are taken on a constellation view for analyzing a direction detection site channel environment. A modulator for receiving and modulating the data; An amplifier for amplifying the data modulated by the modulator; And a transmission antenna for transmitting data amplified by the amplifier.

A data receiver for quantitative characterization of a direction detection test site according to an aspect of the present invention for achieving the above object, comprising: a receiving antenna for receiving an external signal; A low noise amplifier for amplifying the signal received by the receiving antenna; A demodulator for demodulating the signal amplified by the low noise amplifier; And a constellation diagram for monitoring a signal demodulated by the demodulator.

Here, the spectrum analyzer may be further provided at a rear end of the low noise amplification unit to identify frequency components.

In order to achieve the above object, a data transceiver for quantitative characteristic analysis of a direction detection test site according to an aspect of the present invention comprises a same symbol so that the coordinates of the same constellation are taken on a constellation diagram for analyzing a direction detection site channel environment. A transmitter to receive the modulated data, modulate and amplify the data, and to transmit the amplified data; And a data receiver configured to receive the signal transmitted from the data transmitter, amplify and demodulate the received signal, and monitor the demodulated signal.

A method for quantitative characterization of a direction detection test site according to an aspect of the present invention for achieving the above object is a measure for comparing the magnitude of the reflected wave and the Gaussian noise and the signal of the direct wave. Defining a third variable; Defining two variables, fourth and fifth variables as a measure for comparing a phase of the reflected wave and the direct wave due to the Gaussian noise; And showing the first to fifth variables for each frequency.

Here, the first to third variables may be variables indicating how small the magnitude of the reflected wave and the Gaussian noise is compared to the signal magnitude of the direct wave.

Also, the fourth and fifth variables may be variables indicating how the phase of the direct wave due to the influence of the reflected wave and the Gaussian noise is different from that of the direct wave when the reflected wave and the Gaussian noise are not affected. have.

In order to achieve the above object, a data transmission method used for quantitative characteristic analysis of a direction detection test site according to an aspect of the present invention comprises configuring data in the same symbol so that the same constellation coordinates are taken on a constellation diagram, and a predetermined modulation scheme. It modulates and transmits.

In order to achieve the above object, a data transmission / reception method used for quantitative characteristic analysis of a direction detection test site according to an aspect of the present invention comprises configuring data in the same symbol so that the same constellation coordinates are taken on a constellation diagram, and a predetermined modulation scheme. Modulating and transmitting the signal; And demodulating in a predetermined demodulation manner by receiving the transmitted signal in the transmitting step.

The data transmission / reception method may further include monitoring a constellation degree after the demodulation step.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following descriptions are only examples and illustrated without any other intention, except for the purpose of helping a person having ordinary knowledge in the art to which the present invention pertains, to limit the scope of the invention It shall not be used.

All of the modulation and demodulation schemes of the N-PSK series or the N-QAM series are applicable. Here, the quadrature phase shift modulation (hereinafter also referred to as QPSK) will be described as an example.

1 is a block diagram schematically illustrating a transmitter model for quantitative characterization of a direction detection test site according to an embodiment of the present invention.

Referring to FIG. 1, a data transmitter for quantitative analysis of a direction detection test site according to an embodiment of the present invention includes a modulator 10, an amplifier 12, and a transmit antenna 14.

The modulator 10 receives and modulates data composed of the same symbols so that the coordinates of the same constellation are taken on the constellation diagram for analyzing the direction detection site channel environment.

The amplifier 12 amplifies the data modulated by the modulator 10.

The transmission antenna 14 transmits data amplified by the amplifier 12.

Thus, the data Data is applied to the modulator 10 and modulated by the modulator 10, and the data modulated by the modulator 10 is amplified by the power amplifier Amp 12. It is transmitted via the transmit antenna 14.

The modulator 10 may use an N-PSK modulation scheme or an N-QAM modulation scheme.

The PSK modulation method is phase shift keying, and refers to a method of transmitting data to be transmitted in correspondence with a phase of a carrier wave. The QAM modulation method is quadrature amplitude modulation, which is one of multi-level modulation, which is a kind of digital modulation, and uses a combination of both amplitude and phase of a modulated wave (carrier). As a modulation method, it is widely used as a high speed modulator at the time of digital transmission using an analog telephone line.

Since the content of the phase shift modulation and the quadrature amplitude modulation is well known to those skilled in the art, detailed description thereof will be omitted.

As described above, the modulator 10 in FIG. 1 exemplifies quadrature phase shift keying (QPSK) among the phase shift modulation schemes.

The quadrature phase shift keying (QPSK) is one of the phase shift keying (PSK), and transmits two transmission signals (0 or 1) of two values (0 or 1) and π phase (inverse phase) of the carrier. Unlike binary phase shift modulation (BPSK), which is transmitted in correspondence with a phase, it refers to a method of collecting two bits of 0 and 1 of two values of a digital signal and transmitting them in correspondence with four phases of a carrier wave.

For example, data (0 0) is transmitted in phase 0, data (0 1) in phase π / 2, data (1 0) in phase π, and data (1 1) in phase 3π / 2. Unlike binary phase shift modulation, which takes a phase change of a carrier at intervals of 90 degrees and transmits one bit in one symbol, two bits are transmitted in one sign. Quadrature Phase Shift Keying (QPSK) is capable of transmitting twice the data in the same frequency bandwidth as the two phase shift keying wave, which is widely used in the transmission of voice signals and satellite communication in satellite broadcasting.

In FIG. 1, the number of data may be 2N. If the number of data is 2N, N symbols are generated when the 2N data is composed of 1 and then modulated with a QPSK signal. The N symbols are amplified by the power amplifier 12 and transmitted through the transmit antenna 14.

2 is a block diagram schematically illustrating a receiver model for quantitative characterization of a direction detection test site according to an embodiment of the present invention.

2, a data receiver for quantitative characteristic analysis of a direction detection test site according to an embodiment of the present invention includes a reception antenna 20, a low noise amplifier (LNA) 22, a demodulator 24, and a constellation diagram ( 28).

The receiving antenna 20 receives an external signal, and the constant low noise amplifier 22 amplifies the signal received by the receiving antenna 20, and the demodulator 24 is connected to the low noise amplifier 22. Demodulate the signal amplified. The signal demodulated by the demodulator 24 is monitored through the constellation diagram 28.

Similar to the modulator (10 in FIG. 1) of the data transmitter shown in FIG. 1, the demodulator 24 may use an N-PSK demodulation scheme or an N-QAM demodulation scheme.

2 illustrates a QPSK demodulator 24 using a QPSK demodulation method.

Furthermore, the data receiver may further include a spectrum analyzer 26 for identifying a frequency component at a rear end of the low noise amplifier 22.

1 and 2, a data transceiver for quantitative characterization of a direction detection test site according to an embodiment of the present invention may have the same constellation degree coordinates on a constellation view for analyzing a direction detection site channel environment. Receiving and modulating and amplifying data consisting of symbols, transmitting amplified data (FIG. 1), receiving a signal transmitted from the data transmitter, amplifying and demodulating the received signal, and demodulating the demodulated signal. It may be provided with a data receiver (FIG. 2) for monitoring.

Each of the data transmitter (FIG. 1) and the data receiver (FIG. 2) constituting the data transceiver has been described above sufficiently, and thus a detailed description thereof will be omitted.

Next, referring to FIG. 1, a data transmission method used for quantitative characterization of a direction detection test site according to an embodiment of the present invention will be described. The data transmission method uses data to display the same constellation coordinates on the constellation diagram. It is a data transmission method which consists of the same symbol and modulates and transmits by a predetermined modulation method.

The modulation scheme may be N-PSK modulation or N-QAM modulation as described above.

In addition, referring to Figures 1 and 2, the data transmission and reception method used for the quantitative characteristic analysis of the direction detection test site according to an embodiment of the present invention, the data consists of the same symbol in order to have the same constellation coordinates on the constellation diagram And modulating and transmitting the signal in a predetermined modulation scheme (for example, data transmission using the data transmitter of FIG. 1), and receiving and demodulating and receiving the signal transmitted in the transmitting step. (Eg, data receiving step using the data receiver of FIG. 2).

The data transmission / reception method may further include monitoring a constellation after the demodulating step, and performing a spectrum analysis step through the spectrum analyzer 26 to check whether other frequency components are received around the data to be received. It may further include.

Similarly, the modulation scheme may be N-PSK modulation or N-QAM modulation. In addition, the demodulation scheme may be N-PSK demodulation or N-QAM demodulation corresponding to the modulation scheme.

Next, the quantitative characteristic analysis method of the direction detection test site according to an embodiment of the present invention will be described.

According to an embodiment of the present invention, a method for quantitative characterization of a directional detection test site includes: 1) defining first to third variables, 2) defining fourth and fifth variables, and 3) Showing the first to fifth variables for each frequency.

The first to third variables are measures for comparing the magnitude of the reflected wave and Gaussian noise and the signal magnitude of the direct wave. For example, the first to third variables may be variables indicating how small the magnitude of the reflected wave and the Gaussian noise is compared to the signal magnitude of the direct wave.

The fourth to fifth variables are measures for comparing the phases of the reflected wave and the direct wave due to the Gaussian noise. For example, the fourth and fifth variables indicate how the phase of the direct wave due to the influence of the reflected wave and the Gaussian noise is distorted compared to the phase of the direct wave when the reflected wave and the Gaussian noise are not affected. It can be a variable. Referring to FIGS. 1 to 4 (FIG. 3 is a mapping table of QPSK, and FIG. 4 is a constellation diagram of QPSK), the quantitative characteristic analysis method will be described as an example.

In general, QPSK uses only phase information after demodulation.

However, when looking at constellations during demodulation, amplitude information and phase information can be viewed at the same time. Of course, if the receiver itself is QPSK demodulation, but is designed to show only the phase information, you can use the size information and phase information using QAM.

The point on the constellation map shows not only direct waves but also effects such as reflection and diffraction and Gaussian noise on the channel. Since the receiver cannot distinguish them during demodulation, the influence of the reflected wave is possible by analyzing the distribution characteristic on the constellation diagram.

,

)로 표현된 벡터에 찍히게 된다.In FIG. 1, since all data are transmitted to 1 (to have the coordinates of the constellations plotted in the first quadrant on the constellation diagram of FIG. 4), when only the direct wave is present when demodulated to QPSK by the QPSK demodulator 24, FIG. On the constellation diagram of 4, at the origin (0,0) of the first quadrant by the mapping table of FIG.

,

It is printed on a vector represented by).

,

) 좌표로 옮겨지게 된다(직접파에서 φ만큼 틀어지게 됨). 이 좌표는 채널 상의 가우 시안 노이즈에 의하여 j번째 심볼은 (x_j, y_j)좌표로 옮겨지게 된다(직접파에서 ψ_j만큼 틀어지게 됨).However, due to the multi-path echo,

,

) Is shifted to the coordinates (shifted by φ at the direct wave). This coordinate is shifted by the Gaussian noise on the channel to the (x _j , y _j ) coordinate (which is shifted by ψ _j in the direct wave).

In FIG. 4, the following Equation 1 is defined for the N symbols transmitted to measure the intensity of the average Gaussian noise.

In Equation 1, (xn, yn) is a reception coordinate (n = 1, 2, ..., N) on the n th constellation diagram.

Then, the following equation (2) is defined as a measure for measuring how small the average Gaussian noise is compared to the strength of the direct wave signal.

Δ = 10 log (direct wave signal strength / averaged Gaussian noise strength)

   = 10 log (1 / Λ)

Equation 3 is defined as follows to measure the presence and intensity of the most important reflected wave under the direction detection site conditions.

ξ = 10 log (direct signal strength / reflected signal strength) =

The presence of reflected waves does not affect phase direction detection if the phases are in phase.

As described above, in the quantitative characterization method of the direction detection test site according to the present invention, as a measure for comparing the magnitude of the reflected wave and Gaussian noise and the signal magnitude of the direct wave, three variables, Λ, Define Δ and ξ.

The fourth variable φ and the fifth variable ψ are defined from [Equation 4] and [Equation 5] to measure how the phase is shifted by the reflected wave and the degree of the phase shift by the Gaussian noise. do.

The fourth variable φ and the fifth variable ψ are different in phase of the direct wave due to the influence of the reflected wave and the Gaussian noise compared to the phase of the direct wave when the reflected wave and the Gaussian noise are not affected. Is a variable that indicates

In this way, the quantitative characteristic analysis method of the direction detection test site according to the present invention can quantitatively determine the suitability of the direction detection test site through constellation analysis.

The quantitative characteristic analysis method of the direction detection test site according to the present invention, the data transmitter, the receiver, the transceiver, the data transmission method, and the data transmission / reception method used for the characteristic analysis are not limited to the above embodiments, and do not depart from the basic principles of the present invention. Various designs and applications in the scope will be apparent to those of ordinary skill in the art.

As described above, the present invention provides a quantitative characteristic analysis method of a direction detection test site, a data transmitter, a receiver, a transceiver, a data transmission method, and a data transmission and reception method used for the characteristic analysis, thereby quantitatively determining the suitability of the direction detection test site. It has the effect of objectively selecting the direction detection test site with clean signal environment.

Claims (20)

In data transmitter for quantitative characterization of direction detection test site: A modulator configured to receive and modulate data consisting of the same symbols so that the same constellation coordinates are taken on the constellation diagrams for analyzing the direction detection site channel environment; An amplifier for amplifying the data modulated by the modulator; And And a transmitting antenna for transmitting the data amplified by the amplifying unit. The method of claim 1, The modulator uses an N-PSK modulation scheme. The method of claim 1, The modulator uses an N-QAM modulation method. For data receivers for quantitative characterization of direction detection sites: A receiving antenna for receiving an external signal; A low noise amplifier for amplifying the signal received by the receiving antenna; A demodulator for demodulating the signal amplified by the low noise amplifier; And And a constellation diagram for monitoring a signal demodulated by the demodulator. The method of claim 4, wherein The demodulator uses an N-PSK demodulation method. The method of claim 4, wherein And the demodulator uses an N-QAM demodulation scheme. The method of claim 4, wherein And a spectrum analyzer configured to identify a frequency component at a rear end of the low noise amplifier. In data transceiver for quantitative characterization of direction detection test site: A transmitter for receiving, modulating, and amplifying data consisting of the same symbols so that the same constellation coordinates are taken on the constellation diagram for analyzing the direction detection test site channel environment, and transmitting the amplified data; And And a data receiver configured to receive the signal transmitted from the data transmitter, amplify and demodulate the received signal, and monitor the demodulated signal. In the quantitative characterization method of the direction detection test site: A measure for comparing the magnitude of the reflected wave and Gaussian noise and the signal of the direct wave, the method comprising: defining three variables, first to third variables; Defining two variables, fourth and fifth variables as a measure for comparing a phase of the reflected wave and the direct wave due to the Gaussian noise; And And displaying the first to fifth variables for each frequency. The method of claim 9, The first to the third variable is a variable indicating how small the magnitude of the reflected wave and the Gaussian noise compared to the signal size of the direct wave quantitative characteristic analysis method of the direction detection test site. The method of claim 9, The fourth and fifth variables are variables indicating how the phase of the direct wave due to the influence of the reflected wave and the Gaussian noise is different from that of the direct wave when the reflected wave and the Gaussian noise are not affected. Quantitative characterization method of direction detection test site. In the data transmission method used for the quantitative characterization of the direction detection test site: A method of transmitting data, characterized in that the data is composed of the same symbol and modulated by a predetermined modulation scheme so that the coordinates of the same constellation are taken on the constellation diagram. The method of claim 12, And the modulation scheme is N-PSK modulation. The method of claim 12, The modulation method is a data transmission method, characterized in that the N-QAM modulation. In the data transmission and reception method used for the quantitative characterization of the direction detection test site: Constructing the same symbol and modulating and transmitting the same symbol in a predetermined modulation scheme so that the same constellation is also coordinated on the constellation diagram; And And demodulating and receiving the signal transmitted in the transmitting step by using a predetermined demodulation method. The method of claim 15, wherein the data transmission and reception method further comprises the step of monitoring the constellation after the demodulation step. The method of claim 15, The modulation method is a data transmission and reception method, characterized in that the N-PSK modulation. The method of claim 15, The modulation method is a data transmission and reception method, characterized in that the N-QAM modulation. The method of claim 17, The demodulation method is N-PSK demodulation method. The method of claim 18, The demodulation method is N-QAM demodulation method.

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