KR200432984Y1 - Apparatus for measuring and diagnosing transmission lines of repeater system - Google Patents

Abstract

      The present invention measures the voltage standing wave ratio of the antenna and the transmission line by branching the signal from the directional coupler provided at the end of the repeater to monitor the normal operation of the antenna and the transmission line in the repeater of the mobile communication system. The present invention relates to a transmission line measuring and diagnosing device of a repeater capable of continuously monitoring a matching state between a transmission line and an antenna of a repeater equipment in operation.

      To this end, the present invention, a directional coupler for extracting the incident signal and the reflected signal, a switch for selectively switching the incident signal and the reflected signal extracted from the directional coupler, an oscillator for generating a predetermined local frequency, A frequency converter which receives a local signal from an oscillator and down-converts the extracted incident or reflected signal to an intermediate frequency and filters only the intermediate frequency signal to pass; and amplifies the filtered intermediate frequency signal with a predetermined gain and amplifies the filtered signal A signal processing and measuring unit for detecting the intensity of the intermediate frequency signal and converting the detected signal into a digital signal, a pulse signal generator for receiving a local signal from the oscillator, generating a pulse signal, and transmitting the pulse signal to a directional coupler; Reflected wave measuring unit for measuring a pulse signal, and the reflected wave measuring unit And a calculating section for calculating the position on the transmission line in which the abnormality occurs using the reflected wave measured by.

      With the above configuration, the present invention can remotely monitor, in real time, the failure of assembly of the transmission line and antenna, the degradation of the transmission line, the lightning line, etc. by measuring the voltage standing wave ratio, and also by diagnosing the state of the transmission line. In the event of a failure between the transmission line and the antenna, the point of failure can be easily found so that service failure due to an unforeseen situation can be prevented in advance, enabling fast failure recovery.

Repeater, Transmission Line, Antenna, Voltage Standing Wave Ratio, Measurement, Diagnosis

Description

Apparatus for measuring and diagnosing transmission lines of repeater system

1 is a block diagram showing the configuration of a general repeater.

Figure 2 is a block diagram showing the configuration of a transmission line measurement and diagnostic apparatus for a mobile communication repeater according to the present invention.

3 is a view showing a transmission line measurement method of a mobile communication repeater according to the present invention.

Figure 4 is a view showing a transmission line diagnostic method of the mobile communication repeater according to the present invention.

5 is a diagram illustrating a signal processing and measuring unit of a transmission line measuring and diagnosing apparatus for a mobile communication repeater according to the present invention;

6 is a view showing an embodiment of a signal detection circuit of a transmission line measurement and diagnostic apparatus for a mobile communication repeater according to the present invention.

※ Explanation of code for main part of drawing

101. Link antenna 102. First duplexer

103. Downlink first attenuator 104. Downlink low noise amplifier

105. Downlink first filter 106. Downlink first amplifier

107. Downlink Second Filter 108. Downlink Second Amplifier

109. Downlink Second Attenuator 110. Downlink Power Amplifier

111. Second duplexer 112. Service antenna

113. Uplink Low Noise Amplifier 114. Uplink First Filter

115. Uplink First Amplifier 116. Uplink Second Filter

117. Uplink second amplifier 118. Uplink third filter

119. Uplink Power Amplifier 120. Uplink Attenuator

201. Antenna 202. Transmission line

203. Directional coupler 204. Third switch

205. First switch 301. Second switch

302. Frequency converter 303. Oscillator

304. Signal processing and measuring unit 305. Control unit

401. Pulse signal generator 402. Reflected wave measurement unit

403. Compute Unit 501. Mixer

502. Filter 503. Amplifier

504. Signal detection circuit 505. A / D converter

      The present invention measures the voltage standing wave ratio of the antenna and the transmission line by branching the signal from the directional coupler provided at the end of the repeater to monitor the normal operation of the antenna and the transmission line in the repeater of the mobile communication system. The present invention relates to a transmission line measuring and diagnosing device of a repeater capable of continuously monitoring a matching state between a transmission line and an antenna of a repeater equipment in operation by diagnosing the condition of the repeater.

      In general, a mobile communication system constructs a communication network by continuously arranging a plurality of cells. In this case, when a shadow area such as a large building or an underground space does not reach, a repeater is installed and serviced. 1 is a block diagram showing a general configuration of such a median machine.

      Referring to FIG. 1, the link antenna 101 receives a downlink signal from a base station (not shown), passes only a band of the downlink signal at the first duplexer 102, and then connects the downlink first connected to the rear end. Signaled through the path from the attenuator 103 to the downlink power amplifier 110, it is sent out to the shadowed area by the second duplexer 111 and the service antenna 112.

      In the case of the uplink path, only the band of the uplink signal is passed through the uplink signal from the terminal (not shown) received by the service antenna 112 at the second duplexer 111, The signal is processed while passing through the path from the uplink low noise amplifier 113 to the uplink attenuator 120 and sent by the first duplexer 102 and the link antenna 101 to the base station.

      In this case, the link antenna or the service antenna is connected to the repeater main body by a transmission line, and the matching state of the transmission line from the transmitting and receiving front end portion of the repeater to the antennas and the antennas themselves greatly affects communication quality, so that the monitoring is always performed. In the event of an abnormality, it is necessary to quickly identify the location and take action.

      The matched state is a measure of how efficiently a signal is transmitted between two adjacent components. A standing wave is generated in a transmission line connecting the front and rear ends of the transmission and reception antennas when the front and rear ends of the transmission and reception are in mismatch with each other. Will occur. The magnitude of the standing wave is represented by standing wave ratio (SWR), which means the ratio of the current or voltage measured at the maximum and minimum points of the standing wave present in the transmission line.

      The standing wave ratio is calculated by SWR = (1 + ρ) / (1-ρ). When SWR is 1, the reflection coefficient is 0, which means that the incident power is transmitted as it is. When SWR is ∞, it means that most of the incident power is reflected. Where ρ is the reflection coefficient.

      The present invention measures the voltage standing wave ratio of the antenna and transmission line by branching the signal from the directional coupler at the end of the repeater to monitor the normal operation of the antenna and transmission line used in the repeater. By diagnosing, the objective is to continuously monitor the matching between the transmission line and antenna of the repeater equipment in operation.

      In addition, the present invention can remotely monitor the transmission line and antenna assembly failure, degradation of the transmission line, damage caused by lightning, etc. by measuring the voltage standing wave ratio in real time, and by diagnosing the state of the transmission line, the transmission line and antenna In the event of a failure in the meantime, the point of failure can be easily found, and the purpose of this is to enable a quick failure recovery by preventing a service failure due to an unforeseen situation in advance.

      In order to solve the above technical problem, a transmission line measuring and diagnosing apparatus for a mobile communication repeater according to the present invention includes: a directional coupler 203 for extracting an incident signal input thereto or a reflected signal returning reflected; A first switch 205 for selectively switching a signal input to the directional coupler; and a second switch 301 for selectively switching an incident signal and a reflected signal extracted from the directional coupler; and the second switch A third switch 204 for selectively switching to measure or diagnose a transmission line connected to the oscillator; and an oscillator 303 for generating a predetermined local frequency; and receiving the local signal from the oscillator and extracting the extracted incident signal or reflection. Frequency conversion that downconverts the signal to an intermediate frequency and filters only the intermediate frequency signal to pass And a signal processing and measurement unit 304 for amplifying the filtered intermediate frequency signal with a predetermined gain and detecting the strength of the amplified intermediate frequency signal and converting the detected signal into a digital signal; and from the oscillator A pulse signal generator 401 for receiving a local signal and generating a pulse signal and transmitting the pulse signal to a first switch; and a reflected wave measuring unit 402 for measuring the reflected wave received from the third switch; and measured by the reflected wave measuring unit An operation unit 403 for calculating a position on a transmission line in which an abnormality occurs using the reflected wave; And a controller 305 for controlling the operations of the first to third switches.

      Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding members will be denoted by the same reference numerals and detailed description thereof will be omitted.

2 is a block diagram showing the configuration of a transmission line measurement and diagnostic apparatus for a mobile communication repeater according to the present invention. As shown, the present invention includes a directional coupler 203 for measuring the standing wave ratio of the signal transmitted to the antenna 201 through the transmission line 202 and diagnosing the abnormality of the transmission line. The directional coupler detects the power of the incident signal at the P _i terminal, and detects the power of the reflected signal at the P _r terminal, and is used for measuring standing wave ratios and diagnosing lines.

In FIG. 2, the first switch 205 is for selectively switching a signal input to the directional coupler 203. To this end, the C ₁ terminal of the first switch is connected to the input side of the directional coupler, the S terminal is connected to the transmission line, and the T terminal is connected to the pulse signal generator 401 described later. With this configuration, in order to measure the standing wave ratio of the signal transmitted to the antenna 201, the C ₁ and S terminals of the first switch are connected and diagnosing the abnormality of the transmission line from the directional coupler to the antenna. In order to do this, the C ₁ and T terminals of the first switch are connected.

In FIG. 2, the second switch 301 functions to connect or block the incident signal and the reflected signal. The second switch 301 connects / disconnects the C ₂ terminal and the I terminal to turn on / off the incident signal, and turns on / off the reflected signal. To do this, connect / disconnect the C ₂ and R terminals. The third switch 204 is connected to the C ₂ terminal.

Such a third switch is operated simultaneously with the first switch to perform any one function of measuring the standing wave ratio or diagnosing the transmission line. That is, to measure the standing wave ratio, the C ₁ and S terminals of the first switch are connected and the C ₃ and S terminals of the third switch are connected at the same time, and the C ₁ and T terminals of the first switch are connected to diagnose the transmission line. The C ₃ and T terminals of the third switch are connected at the same time.

This will be described in more detail as follows. First, in order to measure the standing wave ratios of the antenna 201 and the transmission line 202, the C ₁ terminal of the first switch 205 is connected to the S terminal, and the C ₃ terminal of the third switch 204 is S. It must be connected to a terminal. In this way, the incident signal from the P _i terminal of the directional coupler is applied to the frequency converter 302, receives the local signal from the oscillator 303, and down-converts the incident signal to convert the signal from the signal processing and measurement unit 304. After measuring the magnitude, the reflected signal from the P _r terminal of the directional coupler is again applied to the frequency converter 302, receives the local signal from the oscillator 303, and down-converts the reflected signal to process and measure the signal 304. ), The standing wave ratio is calculated by measuring the magnitude of the signal. At this time, switching between the P _i terminal and the P _r terminal is performed by the second switch 301.

On the contrary, in order to diagnose the abnormality of the transmission line 202, the C ₁ terminal of the _first switch 205 is connected with the T terminal, and the C ₃ terminal of the third switch 204 is connected with the T terminal. Should be. In this way, the pulse is applied from the pulse signal generator 401 to the directional coupler and the signal reflected at the discontinuous point of impedance is received from the P _r terminal of the directional coupler, and then the time is measured by the reflected wave measurement unit 402 and the calculation unit ( The length is calculated by 403 to determine the position on the transmission line where the abnormality occurs.

3 is a diagram illustrating a transmission line measurement method of a mobile communication repeater according to the present invention. In FIG. 2, the C ₁ terminal of the first switch 205 is connected to the S terminal, and C ₃ of the third switch 204. The state in which the terminal is connected to the S terminal is shown. As shown, the signal transmitted to the antenna 201 via the transmission line 202 is detected by the P _i terminal of the directional coupler 203, and the power is detected through the I terminal and the C ₂ terminal of the second switch 301. The frequency converter 302 is applied.

      The local signal generated from the oscillator 303 is simultaneously input to the frequency converter, down-converted to an intermediate frequency, filtered, and applied to the signal processing and measurement unit 304. The signal processing and measuring unit amplifies the filtered intermediate frequency signal with a predetermined gain, detects the strength of the amplified intermediate frequency signal, and converts the detected signal into digital.

Subsequently, the signal reflected through the transmission line 202 is detected by the P _r terminal of the directional coupler 203. The frequency converter 302 passes through the R terminal and the C ₂ terminal of the second switch 301. After applied to the digital conversion through the operation as described above the standing wave ratio is measured. At this time, the controller 305 controls the switching operation of the first to third switches.

4 is a diagram illustrating a method for diagnosing a transmission line of a mobile communication repeater according to the present invention. In FIG. 2, a C ₁ terminal of the first switch 205 is connected to a T terminal, and C ₃ of the third switch 204. The state in which a terminal is connected with the T terminal is shown. As shown, the pulse signal input from the pulse signal generator 401 to the directional coupler and transmitted to the antenna 201 through the transmission line 202 is detected by the P _i terminal of the directional coupler 203. The signal reflected through the transmission line 202 is detected by the P _r terminal of the directional coupler 203. Using this principle, a pulse is applied to the directional coupler and the pulse signal is reflected back to the P _r terminal. By measuring the coming time, it is diagnosed whether there is a problem with the transmission line.

That is, a pulse is applied to the directional coupler and the signal reflected at the discontinuous point of impedance is received from the P _r terminal of the directional coupler, and the time is measured by the reflected wave measurement unit 402 and the length is calculated by the calculation unit 403. The position on the transmission line where the error occurs is identified.

The local signal generated from the oscillator 303 is input to the pulse signal generator 401, and the local signal is converted into a pulse signal and transmitted through the directional coupler. Next, the signal reflected through the transmission line 202 is detected at the P _r terminal of the directional coupler 203 and applied to the reflected wave measurement unit 402 via the R terminal and the C ₂ terminal of the second switch 301. . The calculation unit 403 calculates the length from the time when the reflected wave returns and diagnoses the presence or absence of an abnormality in the transmission line. At this time, the controller 305 controls the on-off operation of the first to third switches.

      5 is a diagram illustrating a signal processing and measuring unit of a transmission line measurement and diagnostic apparatus for a mobile communication repeater according to the present invention, and FIG. 6 is a signal detection circuit of the transmission line measurement and diagnostic apparatus for a mobile communication repeater according to the present invention. It is a figure which shows an Example.

      In FIG. 5, the frequency converter 302 inputs a local signal generated from the oscillator 303, down-converts an incident signal or a reflected signal detected by the directional coupler to an intermediate frequency, and then filters the signal by a filter 502. Is applied to the processing and measuring unit 304.

      The signal processing and measuring section 304 amplifies the filtered intermediate frequency signal with a predetermined gain by the amplifier 503 and detects the strength of the amplified intermediate frequency signal by the signal detecting circuit 504, and then A / The D converter 505 converts the detected signal into digital.

In addition, the signal detection circuit 504 may be a circuit as shown in Figure 6 as an embodiment. In FIG. 6, the signal amplified by the amplifier 503 is rectified by the diode D ₁ , and the reference voltage is determined by the resistors R ₁ and R ₂ , and detected.

      In the above described and illustrated with respect to the preferred embodiment of the present invention is not limited to the above embodiment only and variously modified by those of ordinary skill in the art within the scope not departing from the technical gist of the present invention Can be.

      With the above configuration, the present invention can remotely monitor, in real time, the failure of assembly of the transmission line and antenna, the degradation of the transmission line, the lightning line, etc. by measuring the voltage standing wave ratio, and also by diagnosing the state of the transmission line. When a failure occurs between the transmission line and the antenna, the point of failure can be easily found, thereby preventing the service failure due to an unforeseen event and enabling quick failure recovery.

Claims (9)

In the device connected to the mobile communication repeater to measure the performance of the transmission line, A directional coupler for extracting an input incident signal or extracting a reflected signal reflected back; A first switch for selectively switching a signal input to the directional coupler; A second switch for selectively switching the incident signal and the reflected signal extracted from the directional coupler; A third switch connected to said second switch for selectively switching to measure or diagnose a transmission line; An oscillator for generating a predetermined local frequency; A frequency converter which receives the local signal from the oscillator and down-converts the extracted incident or reflected signal to an intermediate frequency and filters only the intermediate frequency signal to pass; A signal processing and measuring unit for amplifying the filtered intermediate frequency signal with a predetermined gain and detecting the strength of the amplified intermediate frequency signal to convert the detected signal into a digital signal; A pulse signal generator which receives a local signal from the oscillator, generates a pulse signal, and transmits the pulse signal to a first switch; A reflected wave measuring unit measuring a reflected wave received from the third switch; A calculating unit calculating a position on a transmission line where an abnormality occurs using the reflected wave measured by the reflected wave measuring unit; And Transmission line measurement and diagnostic apparatus for a mobile communication repeater comprising a; control unit for controlling the operation of the first to third switches. The method of claim 1, wherein the frequency converter, A transmission line measurement of a mobile communication repeater comprising a mixer which receives a local signal from the oscillator and down-converts the extracted incident or reflected signal to an intermediate frequency, and filters to pass only the intermediate frequency signal And diagnostic devices. The method of claim 1, wherein the signal processing and measuring unit, An amplifier for amplifying the filtered intermediate frequency signal with a predetermined gain, a signal detection circuit for detecting the strength of the amplified intermediate frequency signal, and an A / D converter for converting the detected signal into a digital signal. Transmission line measurement and diagnostic device for a mobile communication repeater. The method of claim 1, The frequency converter and the pulse signal generator is a transmission line measurement and diagnostic device of the mobile communication repeater, characterized in that for receiving a local signal from the oscillator. The method of claim 1, The first switch and the third switch is a transmission line measurement and diagnostic apparatus of the mobile communication repeater, characterized in that the simultaneous operation by the control unit. The method of claim 1, C ₃ S and the terminal is connected being of measurement and diagnostic apparatus in a mobile communication repeater, characterized in that for measuring the standing wave ratio in the transmission line the transmission line of the third switch is in C ₁ and the S terminal of the first switch being connected at the same time. The method of claim 1, The incident signal from the P _i terminal of the directional coupler is applied to the frequency converter, receives a local signal from the oscillator, down-converts the incident signal, and measures the magnitude of the incident signal in the signal processing and measurement unit, The reflection signal from the P _r terminal of the directional coupler is applied to the frequency converter, receives the local signal from the oscillator, down-converts the reflection signal, and measures the magnitude of the reflection signal in the signal processing and measurement unit. Transmission line measurement and diagnostic apparatus for a mobile communication repeater characterized in that for measuring the standing wave ratio of the transmission line using the measured incident signal and the reflected signal. The method of claim 1, Transmission line measurement and diagnostic apparatus for a mobile communication repeater characterized in that the diagnosis of the abnormality of the transmission line by connecting the C ₁ and T terminals of the first switch and the C ₃ and T terminals of the third switch at the same time. The method of claim 1, The pulse is applied from the pulse signal generator to the directional coupler, Repeater for mobile communication, characterized by detecting the signal reflected at the discontinuous point of impedance from the P _r terminal of the directional coupler, measuring the time at the reflected wave measuring unit, and calculating the length by the calculating unit to diagnose the abnormality of the transmission line Transmission line measurement and diagnostic devices.

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