KR20010078836A - APPARATUS FOR MEASURING POWER AND S/N RATIO OF PORTABLE TRS(Trunked Radio System) - Google Patents

Abstract

PURPOSE: An apparatus for measuring power and a receiving channel S/N ratio in a portable TRS is provided to measure the S/N ratio of a signal by measuring receiving power for each channel antenna in a TRS and the transmitting power of a transmitter, measuring the power of a transmitting reflected wave generated by the mismatching of antennas, and measuring the power of a receiving channel and the guardband power of the receiving channel. CONSTITUTION: An apparatus for measuring power and a receiving channel S/N ratio in a portable TRS consists of a transmitting power measurement part(102), a power splitter(103), a receiving power measurement part(104), a receiving channel guardband power measurement part(105), a transmitting reflected wave power measurement part(106), and a control part(108). The transmitting power measurement part(102) measures the transmitting power of a transmitter passed through an antenna(100) and a coupler. The power splitter(103) distributes the receiving power passed through the antenna and the coupler. The receiving power measurement part(104) measures the receiving power distributed from the power splitter. The receiving channel guardband power measurement part(105) measures the receiving channel guardband power distributed from the power splitter(103). The transmitting reflected wave power measurement part(106) measures the transmitting power distributed from the power splitter(103) and reflected from the antenna. The control part(108) compares the power measured at the receiving power measurement part(104) with the power measured at the receiving channel guardband power measurement part(105) and displays a receiving channel S/N ratio on an LCD(109).

Description

Power and Receive Channel S / N Ratio Measurement Device in Portable TRS (APPARATUS FOR MEASURING POWER AND S / N RATIO OF PORTABLE Trunked Radio System)

The present invention relates to an apparatus for measuring power and reception channel S / N ratios in a portable TLS, and in particular, measures reception power and transmit power of a transmitter induced in an antenna for each channel of a TRS. In portable TRS measuring the S / N ratio of the signal by measuring the power of the transmitted reflected wave caused by the mismatching of the antenna, and measuring the received channel power and the guardband power of the received channel. The present invention relates to a power and reception channel S / N ratio measuring apparatus of.

The reception frequency bands of current TRS modems are 851 to 866 MHz in the forward direction and 806 to 821 MHz in the reverse direction. Reverse: adjacent to 824-849MHz), interference with each other can interfere with the performance of the application system using the TRS system.

In consideration of the efficient work and manpower management of TRS network operators, the noise environment of the area to be installed is first measured, or in the case of a pre-installed TRS application system, there is an urgent need for equipment for cause analysis when a failure occurs. However, the power analyzer (Spectrum Analyzer) that currently functions such as this, the price of HP 40 million ~ 50 million won per unit, domestic products more than 10 million won is expensive and heavy to use for work There is a difficulty.

Accordingly, in order to solve the above-mentioned conventional problems, an object of the present invention is to measure the reception power and the transmission power of a transmitter induced in each TRS antenna, and transmit reflected waves generated by the mismatching of the antennas. Power and receive channel S / N ratios in portable TRS measuring the ratio of the received channel power to the guardband power of the received channel, i.e., the S / N ratio. It is to provide a measuring device.

1 is an external view of a power measurement device in a portable TRS according to an embodiment of the present invention.

FIG. 2 is a detailed internal circuit diagram of FIG. 1.

* Description of the symbols for the main parts of the drawings *

100: antenna 101: coupler

102: transmit power measuring unit 103: power divider

104: reception power measurement unit 105: reception channel S / N ratio measurement unit

106: transmission 106: reflected wave power measurement unit

107: keypad

108: control unit 109: LCD

The present invention for achieving the above object is a transmission power measuring unit for measuring the transmission power of the transmitter through the antenna and the coupler; A power distributor for distributing received power through the antenna and coupler; A reception power measurement unit measuring reception power distributed by the power divider; A reception channel guardband power measurement unit measuring power of guardbands of reception channels distributed by the power divider; A transmission reflected wave power measurement unit measuring transmission power reflected by the antenna distributed by the power distribution unit; The transmission power and the transmission reflection wave power measured by the transmission power measurement unit and the transmission reflection wave power measurement unit are respectively displayed on the LCD, and the power measured by the reception power measurement unit and the reception channel guardband power measurement unit are compared. It is configured to include a control unit for displaying the S / N ratio of the LCD.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 illustrates an external view of an apparatus for measuring power in a portable TRS according to an exemplary embodiment of the present invention, and FIG. 2 illustrates an internal detailed circuit diagram of FIG. 1.

1 and 2, the apparatus 200 for measuring power and reception channel S / N ratios in a portable TRS according to an embodiment of the present invention includes a transmitter 100 through an antenna 100 and a coupler 101. A transmission power measurement unit 102 for measuring transmission power, a power divider 103 for distributing received power through the antenna 100 and the coupler 101, and a reception power distributed by the power divider 103 A reception channel guardband power measurement unit 105 for measuring power of a guardband of a reception channel distributed by the power divider 103, and the power distribution unit 103. A transmission reflected wave power measuring unit 106 for measuring the transmission power reflected by the distributed antenna 100, and the transmission power measured by the transmission power measuring unit 102 and the transmission reflected wave power measuring unit 106, respectively; The transmit reflected wave power is displayed on the LCD 109, and the reception is performed. And a control unit 108 for comparing the power measured by the power measuring unit 104 and the receiving channel guardband power measuring unit 105, and then displaying the S / N ratio of the receiving channel on the LCD 109. .

The transmission power measuring unit 102 performs a band pass filter (BPF) 21 for band-pass filtering the transmission power of the transmitter through the coupler 101 and a voltage filtered by the BPF 21. A logarithmic amplifier 22 that amplifies the value, an operational amplifier 23 that amplifies the voltage value amplified by the logarithmic amplifier 22 to a predetermined level, and the operational amplifier 23 The A / D converter 24 converts the amplified analog signal into a digital signal and provides the same to the control unit 108.

The reception power measuring unit 1 () 4 filters the BPF 41 to band-pass the reception power distributed by the power divider 103, and filters so that the noise of the frequency filtered by the BPF 41 is less generated. A low noise amplifier (LNA) 42 for amplifying a predetermined frequency to a predetermined level, a BPF 43 for band pass filtering the received power amplified by the LNA 42, and generating a preset frequency. Phase Locked Loop (PLL) 44, an amplifier 45 that amplifies the frequency generated by the PLL 44 to a predetermined level, and the frequency of the received power filtered by the BPF 43 and the amplifier. A mixer 46 for generating a first intermediate frequency by mixing the amplified frequency at 45, a BPF 47 for band pass filtering the first intermediate frequency generated at the mixer 46, and the BPF 47 Amplifying unit 48 for amplifying the first intermediate frequency filtered by A temperature pad (T-pad) 49 for compensating for the change according to the temperature of the amplifier 48, a power divider 50 for distributing the received power compensated by the temperature pad 49, and A variable PLL 51 for generating a variable frequency according to a control signal of the control unit 108, an amplifier 52 for amplifying a frequency generated from the variable PLL 51 to a predetermined level, and the power divider 50 A mixer 53 for generating a second intermediate frequency by mixing the frequency of the received power divided by the amplifier and the amplified frequency in the amplifier 52, and a crystal filler for filtering the second intermediate frequency generated by the mixer 53. (54), an amplifier 55 for amplifying the second intermediate frequency filtered by the crystal filter 54 to a predetermined level, and an algebraic amplifier for amplifying the second intermediate frequency amplified by the amplifier 55 to a voltage value ( 57 and the voltage value amplified by the logarithm amplifier 57 at a predetermined level. Converts the analog signal amplified by the amplifier operational amplifier 57 and the operational amplifier 57 to a DC digital signal consists of the A / D converter 58 provided in the control section 108.

The reception channel guard band power measurement unit 105 filters the band-pass filtering of the received power distributed by the power divider 103 and filters so that the noise of the frequency filtered by the BPF 41 is less generated. A low noise amplifier (LNA) 42 for amplifying a predetermined frequency to a predetermined level, a BPF 43 for bandpass filtering received power amplified by the LNA 42, and generating a preset frequency. Phase Locked Loop (PLL) 44, an amplifier 45 that amplifies the frequency generated by the PLL 44 to a predetermined level, and the frequency of the received power filtered by the BPF 43 and the amplifier. A mixer 46 for generating a first intermediate frequency by mixing the amplified frequency at 45, a BPF 47 for band pass filtering the first intermediate frequency generated at the mixer 46, and the BPF 47 Amplifies the filtered first intermediate frequency to a predetermined level And the amplifier unit 48. A temperature pad (T-pad) 49 for compensating for the change according to the temperature of the amplifier 48; A power divider (50) for distributing the received power compensated at the temperature pad (49). A variable PLL (59) for generating a variable frequency according to a control signal of the control unit (108); An amplifier (60) for amplifying the frequency generated by the variable PLL (59) to a predetermined level. A mixer 61 generating a second intermediate frequency by mixing the frequency of the received power distributed by the power divider 50 and the frequency amplified by the amplifier 60 and the second intermediate frequency generated by the mixer 61. A crystal filter 62 for filtering the voltage, an amplifier 68 for amplifying the second intermediate frequency filtered by the crystal filter 62 to a predetermined level, and a second intermediate frequency amplified by the amplifier 63. An algebraic amplifier 64 for amplifying the signal, an operational amplifier 65 for amplifying the voltage value amplified by the algebraic amplifier 64 to a predetermined level, and converts the analog signal amplified in the operational amplifier 65 into a digital signal. And an A / D converter 66 provided to the controller 108.

The amplifier 48 is a first amplifier 481 for amplifying the first intermediate frequency filtered by the BPF 47 to a predetermined level, and the first intermediate frequency amplified by the first amplifier 482 at a predetermined level. It consists of a second amplifier 482 to amplify.

The transmission reflected wave power measurement unit 106 is a BPF (16) for band-pass filtering the transmission power distributed by the power divider 103, and an amplifier for amplifying the frequency filtered by the BPF (16) to a predetermined level ( 17), an algebraic amplifier 18 for amplifying the frequency amplified by the amplifier 17 to a voltage value, an operational amplifier 19 for amplifying the frequency amplified by the algebraic amplifier 18 to a predetermined level, The A / D converter 20 converts the analog signal amplified by the operational amplifier 19 into a digital signal and provides the converted signal to the controller 108.

The amplifier 17 may include a first amplifier 62l that amplifies the frequency filtered by the BPF 16 to a predetermined level, and a second amplifier that amplifies the frequency amplified by the first amplifier 621 to a predetermined level ( 622 and a second amplifier 623 that amplifies the frequency amplified by the second amplifier 622 to a predetermined level.

Referring to the operation of the power measuring device in the portable TRS according to an embodiment of the present invention configured as described above in detail.

First, the BPF 21 in the transmission power measuring unit 102 band-pass filters the transmission power of the transmitter through the coupler 101 because the transmission power of the transmitter is quite high. The logarithm amplifier 22 amplifies the frequency filtered by the BPF 21 to a voltage value. Since the voltage value amplified by the logarithmic amplifier 22 is a weak signal, the voltage value is amplified to a predetermined level by the operational amplifier 23. The A / D converter 24 converts the analog signal amplified by the operational amplifier 23 into a digital signal and provides it to the controller 108.

The controller 108 displays the digital signal provided from the A / D converter 24, i.e., the measured transmission power, on the LCD 109 so that the user can know the transmission power.

to the next. The BPF 41 of the reception power measuring unit 104 band-pass filters the received power distributed by the power divider 103 in order to measure the power of the weak signal induced in the antenna 100. The bandpass filtered frequency in the BPF 41 is low noise amplified via the LNA 42 and then bandpass filtered through the BPF 43 to be provided to the mixer 46.

Meanwhile. The PLL 44 generates a preset frequency, which is amplified to a predetermined level via the amplifier 45 and then provided to the mixer 46.

The mixer 46 increases the selectivity of the various received signals and considers the possibility of oscillation, thereby mixing the frequency of the received power filtered by the BPF 43 and the frequency amplified by the amplifier 45 to obtain a first intermediate frequency. Occurs.

The first intermediate frequency generated by the mixer 46 is bandpass filtered through the BPF 47, and then sequentially amplified to a predetermined level through the first and second amplifiers 481 and 482 and provided to the temperature pad 49. do.

The temperature pad 49 compensates for changes in temperature of the second amplifier 482, distributes the received power compensated at the temperature pad 49 to the power divider 50, and then mixes the distributed power. 53 to provide.

On the other hand, the PLL 51 generates a variable frequency according to the control signal of the control unit 108, and the generated frequency is amplified to a predetermined level through the amplifier 52, and then provided to the mixer 53. .

The mixer 53 mixes the frequency of the received power distributed by the power divider 50 and the frequency amplified by the amplifier 52 so as to measure only the power of the TRS channel, and thus the center frequency of the crystal filter 54. Generating a second intermediate frequency.

After the second intermediate frequency generated in the mixer 53 is filtered through a crystal filter 54. The amplifier 55 is amplified to a predetermined level and provided to the logarithmic amplifier 56.

The logarithm amplifier 56 amplifies the second intermediate frequency amplified by the amplifier 55 to a voltage value, and the amplified voltage value is amplified to a predetermined level through the amplifier 57 and then the A / D converter 58. Is provided.

The A / D converter 58 converts the analog signal amplified by the operational amplifier 57 into a digital signal and provides it to the controller 108.

The controller 108 displays the digital signal provided from the A / D converter 24, that is, the measured received power on the LCD 109, so that the user can know the received power.

Next, the PLL 59 in the reception channel guardband power measurement unit 105 generates a variable frequency according to the control signal of the control unit 108, and the generated frequency passes through the amplifier 60 to a predetermined level. After amplified by. It is provided to the mixer 61.

The mixer 61 mixes the frequency of the received power distributed by the power divider 50 and the amplified frequency of the amplifier 60 in order to measure the S / N ratio of the channel guardband of the TRS. A second intermediate frequency, which is the center frequency of 62, is generated.

After the second intermediate frequency generated in the mixer (61) is filtered through a crystal filter (62). The amplifier 63 is amplified to a predetermined level and provided to the logarithm amplifier 64.

The logarithm amplifier 64 amplifies the second intermediate frequency amplified by the amplifier 63 to a voltage value, and the amplified voltage value is amplified to a predetermined level via the operational amplifier 65 and then A / D converter ( 66 is provided.

The A / D converter 66 converts the analog signal amplified by the operational amplifier 65 into a digital signal and provides the converted signal to the controller 108.

The controller 108 receives the digital signal provided from the A / D converter 66, that is, the measured guardband power, and compares the received power provided by the reception power measurement unit 106 to calculate the power difference. Thereafter, the S / N ratio of the reception channel is displayed on the LCD 109. It allows the user to know the S / N ratio of the receiving channel.

Next, since the power of the reflected wave is weak, the BPF 16 in the transmission reflected wave power measuring unit 106 performs band pass filtering on the transmission power distributed by the power divider 103. After the bandpass filtered frequency in the BPF (16) is amplified to a predetermined level via the first to third amplifiers (621-623). The logarithmic amplifier 18 is braked.

After the logarithmic amplifier (18) amplifies the frequency amplified by the third amplifier (623) to a voltage value, the amplified voltage value is amplified to a predetermined level via the operational amplifier (19). To the A / D converter 20.

The A / D converter 20 converts the analog signal amplified by the operational amplifier 19 into a digital signal and provides the converted signal to the controller 108.

The controller 108 displays the digital signal provided from the A / D converter 20, that is, the transmission power reflected by the antenna 100 on the LCD 109, so that the user can know the reflected transmission power.

As described above, the present invention measures the reception power and the transmission power of the transmitter induced in the antenna for each channel of the TRS, and measures the power of the transmission reflected wave generated by the mismatching of the antenna, and the reception channel power. By measuring the guardband power of the channel and the receiving channel, the S / N ratio can be measured, making it easy to carry and use conveniently in the field.

In addition, the present invention employs a crystal filter having excellent selectivity during relay amplification to minimize interference between channels.

Claims (7)

A transmission power measuring unit measuring transmission power of a transmitter through an antenna and a coupler; A power distributor for distributing received power through the antenna and coupler; A reception power measurement unit measuring reception power distributed by the power divider; A reception channel guardband power measurement unit measuring power of guardbands of reception channels distributed by the power divider; A transmission reflected wave power measurement unit measuring transmission power reflected by the antenna distributed by the power distribution unit; The transmission power and the transmission reflection wave power measured by the transmission power measurement unit and the transmission reflection wave power measurement unit are respectively displayed on the LCD, and the power measured by the reception power measurement unit and the reception channel guardband power measurement unit are compared. And a control unit for displaying the S / N ratio of the LCD on the portable TRS. The method of claim 1, The transmission power measuring unit is a BPF for band-pass filtering the transmission power of the transmitter through the coupler; An algebraic amplifier for amplifying the frequency filtered by the BPF to a voltage value; An operational amplifier for amplifying the voltage value amplified by the logarithmic amplifier to a predetermined level; And an A / D converter for converting the analog signal amplified by the operational amplifier into a digital signal and providing the control unit to the control unit. The method of claim 1, The receiving power measuring unit comprises: a first BPF for band-pass filtering received power distributed by the power divider; A low noise amplifier for amplifying the filtered frequency to a predetermined level so that the noise of the filtered frequency is less generated in the BPF; A second BPF for band pass filtering the received power amplified by the low noise amplifier; A phase locked loop for generating a preset frequency; A first amplifier for amplifying the frequency generated in the phase locked loop to a predetermined level; A first mixer for generating a first intermediate frequency by mixing a frequency of the received power filtered by the second BPF and a frequency amplified by the first amplifier; A third BPF for band pass filtering the first intermediate frequency generated in the first mixer; An amplifier for amplifying the first intermediate frequency filtered by the third BPF to a predetermined level; A temperature pad for compensating for the change according to the temperature of the amplifier; A power divider for distributing received power compensated at the temperature pad; A variable phase locked loop for generating a variable frequency according to the control signal of the controller; A second amplifier for amplifying the frequency generated in the variable phase locked loop to a predetermined level; A second mixer for generating a second intermediate frequency by mixing the frequency of the received power distributed by the power divider and the frequency amplified by the second amplifier; A crystal filter for filtering a second intermediate frequency generated in the second mixer; A fourth amplifier for amplifying the second intermediate frequency filtered by the crystal filter to a predetermined level; A logarithmic amplifier amplifying a second intermediate frequency amplified by the fourth amplifier to a voltage value; An operational amplifier for amplifying the voltage value amplified by the logarithmic amplifier to a predetermined level; And an A / D converter for converting an analog signal amplified by the operational amplifier into a digital signal and providing the same to the controller. The method of claim 1, The receiving channel guardband power measuring unit comprises: a first BPF for band-pass filtering the received power distributed by the power divider; A low noise amplifier for amplifying the filtered frequency to a predetermined level so that the noise of the filtered frequency is less generated in the BPF; A second BPF for band pass filtering the received power amplified by the low noise amplifier; A phase locked loop for generating a preset frequency; A first amplifier for amplifying the frequency generated in the phase locked loop to a predetermined level; A first mixer for generating a first intermediate frequency by mixing a frequency of the received power filtered by the second BPF and a frequency amplified by the first amplifier; A third BPF for band pass filtering the first intermediate frequency generated in the first mixer; An amplifier for amplifying the first intermediate frequency filtered by the third BPF to a predetermined level; A temperature pad for compensating for the change according to the temperature of the amplifier; A power divider for distributing received power compensated at the temperature pad; A variable phase locked loop for generating a variable frequency according to the control signal of the controller; A second amplifier for amplifying the frequency generated in the variable phase locked loop to a predetermined level; A second mixer for generating a second intermediate frequency by mixing the frequency of the received power distributed by the power divider and the frequency amplified by the second amplifier; A crystal filter for filtering a second intermediate frequency generated in the second mixer; A fourth amplifier for amplifying the second intermediate frequency filtered by the crystal filter to a predetermined level; An algebraic amplifier for amplifying the second intermediate frequency amplified by the fourth amplifier to a voltage value; An operational amplifier for amplifying the voltage value amplified by the logarithmic amplifier to a predetermined level; And an A / D converter for converting the analog signal amplified by the operational amplifier into a digital signal and providing the same to the controller. The method of claim 4. The amplifier includes a first amplifier for amplifying the first intermediate frequency filtered by the third BPF to a predetermined level; And a second amplifier for amplifying the first intermediate frequency amplified by the first amplifier to a predetermined level. The method of claim 1, The transmission reflected wave power measurement unit BPF for band-pass filtering the transmission power distributed by the power divider; An amplifier for amplifying the frequency filtered by the BPF to a predetermined level; A logarithmic amplifier for amplifying the frequency amplified by the amplifying unit to a voltage value; An operational amplifier for amplifying the frequency amplified by the logarithmic amplifier to a predetermined level; And an A / D converter for converting the analog signal amplified by the operational amplifier into a digital signal and providing the same to the controller. The method of claim 6, The amplifier unit and a first amplifier for amplifying the frequency filtered by the BPF to a predetermined level: A second amplifier amplifying the frequency amplified by the first amplifier to a predetermined level; And a third amplifier for amplifying the frequency amplified by the second amplifier to a predetermined level.