CN104898027A - Multifunctional communication signal measurement radio frequency front-end circuit - Google Patents
Multifunctional communication signal measurement radio frequency front-end circuit Download PDFInfo
- Publication number
- CN104898027A CN104898027A CN201510337106.5A CN201510337106A CN104898027A CN 104898027 A CN104898027 A CN 104898027A CN 201510337106 A CN201510337106 A CN 201510337106A CN 104898027 A CN104898027 A CN 104898027A
- Authority
- CN
- China
- Prior art keywords
- port
- circuit
- swr
- mouth
- standing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The invention provides a multifunctional communication signal measurement radio frequency front-end circuit, comprising a transmitter test circuit, a receiver signal output circuit, a broadband power measurement and standing wave cable test circuit, a high power port (T/R port), an antenna port (Ant port) and a standing-wave ratio port (Swr port). According to the test access, in testing a transmitter, narrowband power measurement and demodulation analysis of input signals can be realized; in testing a receiver, the amplitudes of the input signals are controlled to realize only high power port broadband power measurement; in standing-wave test and cable test, single port standing-wave detection and cable fault positioning are realized; and in a test process, Ant port and Swr port power protection circuits are realized. The multifunctional communication signal measurement radio frequency front-end circuit possesses excellent interference immunity and directivity, has antenna system quality evaluating parameters for testing SWR, transmission loss, echo loss, etc, and realizes function measurement of a plurality of communication signals.
Description
Technical field:
The present invention relates to Psophometer, the radio-frequency (RF) front-end circuit of a kind of multifunctional communication signal measurement particularly in communication measurement instrument.
Technical background:
A kind of hand-held comprehensive tester is mainly used in the on-the-spot test that radio set communication equipment, scatter communication equipment and tactics control navigational system, the on-the-spot test guarantee of the signal equipment such as shortwave, ultrashort wave (USW), possesses the power of test of the Performance Characteristics such as standing-wave ratio (SWR), cable loss to antenna and cable simultaneously.
Radio-frequency front-end refers in communication system, the part between antenna and intermediate frequency (or base band) circuit.In this section, signal transmits with radio frequency form, includes receiving path and transmitting path in radio-frequency (RF) front-end circuit.
Current employing domain reflectometer (TDR) technology cable fault location technology, domain reflectometer TDR is the instrument of the most frequently used measurement transmission line characteristic impedance, and it is the measurement utilizing the principle of Time Domain Reflectometry to carry out characteristic impedance.
TDR comprises three part compositions:
(1) fast along signal generator:
The feature typically transmitted is: amplitude 200mv, rise time 35ps, frequency 250KHz square wave.
(2) sampling oscilloscope:
General sampling oscilloscope.
(3) probe system:
Connect measured piece and TDR instrument.
The fast edge signal sent by step source during the operation of test signal is injected on tested transmission line, if transmission line impedance is continuous, this soon along step signal just along transmission line forward direction.When impedance variation appears in transmission line, step signal reflects with regard to some, and a part continues to propagate forward.The Signal averaging reflected is to the step signal injected, and oscillograph can collect this signal.Because the signal of the signal reflected and injection has the regular hour poor, so the edge of this superposed signal that oscillograph collects is with the level, this step reflects the time relationship of signal propagation reflections, corresponding with transmission line electrical length.
Due to TDR technology because its pumping signal is a DC pulse instead of radiofrequency signal, the sensitivity that thus there is radio frequency problem is poor, the shortcoming that the poor and radio frequency parameter of anti-interference cannot be determined.
Summary of the invention:
The object of the invention is to provide a kind of radio-frequency (RF) front-end circuit of multifunctional communication signal measurement of strong interference immunity, in order to solve due to TDR technology because its pumping signal is a DC pulse instead of radiofrequency signal, thus the sensitivity that there is radio frequency problem is poor, and anti-interference poor and radio frequency parameter such as cannot to determine at the shortcoming.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of radio-frequency (RF) front-end circuit radio-frequency (RF) front-end circuit of multifunctional communication signal measurement, comprise transmitter test circuit, receiver signal output circuit, broadband power metering circuit and standing wave cable test circuit, antenna port (Ant mouth), high-power port (T/R mouth), standing-wave ratio (SWR) port (Swr mouth), described antenna port (Ant mouth) is connected with transmitter test circuit input port; Described high-power port (T/R mouth) is connected with transmitter test circuit input port, broadband power metering circuit input port, receiver signal output circuit output port respectively; Described standing-wave ratio (SWR) port (Swr mouth) is connected with the output port of standing wave cable test circuit, and when standing wave test and wireline test, output port adopts Swr mouth, realizes single port standing wave and detects and cable fault location.
In standing wave cable test circuit, have employed FDR frequency domain reflection technology, overcome anti-interference that TDR technology produces poor and radio frequency parameter and the shortcoming such as cannot to determine.
Described antenna port (Ant mouth) and standing-wave ratio (SWR) port (Swr mouth) are provided with protection circuit, achieve the protection to port.
It should be noted that the FDR frequency domain reflection technology that this radio-frequency front-end adopts is the incoming signal produced by radio-frequency signal source, positions and the pumping signal measured as to uncontinuity in transmission line or cable.Often place's defect or discontinuous impact should be antireflection part incoming signal and remaining signal of transmission.During test, one end of tested cable is connected to the reflection measurement port of this instrument, carries out the sweep check of return loss and frequency relation.The test data reflection of now reading be the change of radio-frequency performance characteristic with frequency of measured device.By the inverse transformation (IDFT) of Fourier transform, the raw data of frequency domain collection is transformed into time domain data and is converted to " response-distance/time " relation by " response-frequency " relation, thus determine the localization of fault of radio frequency coaxial-cable.
Compared with prior art, the present invention has excellent anti-interference, directivity and have the parameter that test SWR, loss, return loss etc. evaluate antenna system quality.
When transmitter is tested, input port has two: high-power port (T/R mouth) or antenna port.Realize narrow band power measure and carry out demodulation analysis to input signal.Realize broadband power and measure only high-power mouth.
When receiver test, input signal is the RF signal from signal-processing board, and output port is: high-power mouth (T/R mouth), Ant mouth and Swr mouth.Realize controlling the amplitude of input signal.
When standing wave test and wireline test, output port is Swr mouth, realizes single port standing wave and detects and cable fault location.
Accompanying drawing illustrates:
Accompanying drawing 1 is radio-frequency front-end fundamental diagram.
Embodiment:
When emitting performance is measured, after the high-power RF signal of measurand transmitter is input to " high-power port (T/R mouth) 108 ", enter radio-frequency front-end one integral piece.After attenuator 109, enter power splitter 110, a road output signal of power splitter 110 enters the power that radio-frequency power detecting circuit obtains radiofrequency signal; Another road output signal of power splitter enters radio frequency input range modulate circuit.If when instrument designing is " antenna port (Ant mouth) 101 ", then by directly entering input range modulate circuit after switching over.Signal after amplitude conditioning 104 carries out down coversion 105.Intermediate-freuqncy signal after down coversion carries out intermediate frequency conditioning 106, and last intermediate frequency exports 107.
When transmitter is tested, input port has two: high-power port (T/R mouth) 108 or antenna port (Ant mouth) 101.Realize narrow band power measure and carry out demodulation analysis to input signal.Realize broadband power and measure only high-power mouth.
When receptivity is measured, be in emission mode.First at RF digitization unit, utilize DDS121 technology to produce the first intermediate-freuqncy signal, the first intermediate-freuqncy signal obtains the second intermediate-freuqncy signal after calibration circuit 120.This intermediate-freuqncy signal enters amplitude control circuit 118 after variable-frequency filtering 119, exports the radio-frequency carrier meeting receiver performance test needs.
When receiver test, input signal is the RF signal from signal-processing board, and output port is: high-power mouth (T/R mouth) 108, Ant mouth 101 and Swr mouth 112.Realize controlling the amplitude of input signal.
When carrying out standing-wave ratio (SWR) and wireline test, the output signal of RADIO FREQUENCY SYNTHESIZER arrives standing-wave ratio (SWR) test connector by directional coupler 113.Forward voltage on connector and reverse voltage is obtained by directional coupler 113.This signal, after double-log wave detector 115 detection is also amplified, is calculated by software and obtains the standing-wave ratio (SWR) of tested device and the loss situation of cable, and position cable fault.
When transmitter is tested, input port has two: high-power port (T/R mouth) or antenna port.Realize narrow band power measure and carry out demodulation analysis to input signal.Realize broadband power and measure only high-power mouth.
When receiver test, input signal is the RF signal from signal-processing board, and output port is: high-power mouth (T/R mouth) 108, Ant mouth 101 and Swr mouth 112.Realize controlling the amplitude of input signal.
When standing wave test and wireline test, output port is Swr mouth 112, realizes single port standing wave and detects and cable fault location.
Burning out antenna opening and backward power to prevent power overload to pour in down a chimney and burn out Swr mouth 112, devising high-power protection 102 and reverse power protection circuit 114.
What in the present invention, cable fault location technology adopted is FDR testing scheme.The incoming signal produced by radio-frequency signal source, positions and the pumping signal measured as to uncontinuity in transmission line or cable.Often place's defect or discontinuous impact should be antireflection part incoming signal and remaining signal of transmission.During test, one end of tested cable is connected to the reflection measurement port of this instrument, carries out the sweep check of return loss and frequency relation.The test data reflection of now reading be the change of radio-frequency performance characteristic with frequency of measured device.By the inverse transformation (IDFT) of Fourier transform, the raw data of frequency domain collection is transformed into time domain data and is converted to " response-distance/time " relation by " response-frequency " relation, thus determine the localization of fault of radio frequency coaxial-cable.
FDR technology not only has excellent anti-interference, directivity and have test SWR, and loss, return loss etc. evaluate the parameter of antenna system quality.
Embodiments of the present invention are not limited to above embodiment, and the various changes made under the prerequisite not departing from present inventive concept all belong to protection scope of the present invention.
Claims (3)
1. the radio-frequency (RF) front-end circuit of a multifunctional communication signal measurement, comprise transmitter test circuit, receiver signal output circuit, broadband power metering circuit and standing wave cable test circuit, antenna port (Ant mouth), high-power port (T/R mouth), standing-wave ratio (SWR) port (Swr mouth), described antenna port (Ant mouth) is connected with transmitter test circuit input port; Described high-power port (T/R mouth) is connected with transmitter test circuit input port, broadband power metering circuit input port, receiver signal output circuit output port respectively; Described standing-wave ratio (SWR) port (Swr mouth) is connected with the output port of standing wave cable test circuit.
2. the radio-frequency (RF) front-end circuit radio-frequency (RF) front-end circuit of multifunctional communication signal measurement according to claim 1, is characterized in that: in standing wave cable test circuit, have employed FDR frequency domain reflection technology.
3. the radio-frequency (RF) front-end circuit radio-frequency (RF) front-end circuit of multifunctional communication signal measurement according to claim 1, is characterized in that: antenna port (Ant mouth) and standing-wave ratio (SWR) port (Swr mouth) are provided with protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510337106.5A CN104898027A (en) | 2015-06-17 | 2015-06-17 | Multifunctional communication signal measurement radio frequency front-end circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510337106.5A CN104898027A (en) | 2015-06-17 | 2015-06-17 | Multifunctional communication signal measurement radio frequency front-end circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104898027A true CN104898027A (en) | 2015-09-09 |
Family
ID=54030801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510337106.5A Pending CN104898027A (en) | 2015-06-17 | 2015-06-17 | Multifunctional communication signal measurement radio frequency front-end circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104898027A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281850A (en) * | 2015-11-13 | 2016-01-27 | 成都前锋电子仪器有限责任公司 | Handheld radio comprehensive tester |
| CN106353585A (en) * | 2016-10-20 | 2017-01-25 | 成都前锋电子仪器有限责任公司 | Data processing circuit used for radio frequency power reflectometer |
| CN106405219A (en) * | 2016-10-20 | 2017-02-15 | 成都前锋电子仪器有限责任公司 | Radio-frequency power reflectometer |
| CN105262485B (en) * | 2015-11-13 | 2018-05-04 | 成都前锋电子仪器有限责任公司 | A kind of wideband generative circuit for radio general measuring instrument RF local oscillator circuit |
| WO2019165601A1 (en) * | 2018-02-28 | 2019-09-06 | 海能达通信股份有限公司 | Method and device for detecting standing wave, and device having storage function |
| CN113206697A (en) * | 2021-03-19 | 2021-08-03 | 中国电子科技集团公司第二十九研究所 | Broadband radio frequency receiving and processing system device and self-checking method thereof |
| CN113612550A (en) * | 2021-07-31 | 2021-11-05 | 荣耀终端有限公司 | Radio frequency channel detection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2606358Y (en) * | 2003-02-24 | 2004-03-10 | 徐玉锁 | Transmission type microwave signal sampling and measuring devices |
| CN2724306Y (en) * | 2004-08-18 | 2005-09-07 | 中兴通讯股份有限公司 | Radio frequency automatic detector |
| US20050215208A1 (en) * | 2004-03-29 | 2005-09-29 | Stoddard Robert E | Generator for agile frequency signals |
| CN102271002A (en) * | 2010-06-03 | 2011-12-07 | 美国博通公司 | Radio front end and circuit |
| CN204705691U (en) * | 2015-06-17 | 2015-10-14 | 成都前锋电子仪器有限责任公司 | A kind of radio-frequency (RF) front-end circuit of multifunctional communication signal measurement |
-
2015
- 2015-06-17 CN CN201510337106.5A patent/CN104898027A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2606358Y (en) * | 2003-02-24 | 2004-03-10 | 徐玉锁 | Transmission type microwave signal sampling and measuring devices |
| US20050215208A1 (en) * | 2004-03-29 | 2005-09-29 | Stoddard Robert E | Generator for agile frequency signals |
| CN2724306Y (en) * | 2004-08-18 | 2005-09-07 | 中兴通讯股份有限公司 | Radio frequency automatic detector |
| CN102271002A (en) * | 2010-06-03 | 2011-12-07 | 美国博通公司 | Radio front end and circuit |
| CN204705691U (en) * | 2015-06-17 | 2015-10-14 | 成都前锋电子仪器有限责任公司 | A kind of radio-frequency (RF) front-end circuit of multifunctional communication signal measurement |
Non-Patent Citations (2)
| Title |
|---|
| 杨予淮 等: "频域反射计的原理与应用", 《国外电子测量技术》 * |
| 黄歆海: "手持式频谱仪在无线电测试测量中的应用", 《今日电子》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281850A (en) * | 2015-11-13 | 2016-01-27 | 成都前锋电子仪器有限责任公司 | Handheld radio comprehensive tester |
| CN105262485B (en) * | 2015-11-13 | 2018-05-04 | 成都前锋电子仪器有限责任公司 | A kind of wideband generative circuit for radio general measuring instrument RF local oscillator circuit |
| CN106353585A (en) * | 2016-10-20 | 2017-01-25 | 成都前锋电子仪器有限责任公司 | Data processing circuit used for radio frequency power reflectometer |
| CN106405219A (en) * | 2016-10-20 | 2017-02-15 | 成都前锋电子仪器有限责任公司 | Radio-frequency power reflectometer |
| WO2019165601A1 (en) * | 2018-02-28 | 2019-09-06 | 海能达通信股份有限公司 | Method and device for detecting standing wave, and device having storage function |
| CN113206697A (en) * | 2021-03-19 | 2021-08-03 | 中国电子科技集团公司第二十九研究所 | Broadband radio frequency receiving and processing system device and self-checking method thereof |
| CN113612550A (en) * | 2021-07-31 | 2021-11-05 | 荣耀终端有限公司 | Radio frequency channel detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104898027A (en) | Multifunctional communication signal measurement radio frequency front-end circuit | |
| US9002291B2 (en) | Standing wave detection method, standing wave detection apparatus and base station | |
| US5548222A (en) | Method and apparatus for measuring attenuation and crosstalk in data and communication channels | |
| RU2485533C2 (en) | Method for check of energy distribution system and energy distribution system analyser | |
| US8278944B1 (en) | Vector network analyzer having multiplexed reflectometers for improved directivity | |
| Lo et al. | Noise-domain reflectometry for locating wiring faults | |
| Song et al. | Detection and location of multiple wiring faults via time–frequency-domain reflectometry | |
| CN105510766A (en) | Radio frequency cable fault positioning detection device and method | |
| CN204705691U (en) | A kind of radio-frequency (RF) front-end circuit of multifunctional communication signal measurement | |
| US11038603B2 (en) | Antenna detection through noise measurement | |
| CN106771666A (en) | A kind of many standing wave point positioning systems of anti-interference high accuracy antenna-feedback system | |
| CN110581741B (en) | Standing wave abnormal position detection method, equipment and medium | |
| Shi et al. | Detection and location of single cable fault by impedance spectroscopy | |
| CN210465651U (en) | Train communication cable analytical equipment | |
| US20020118024A1 (en) | Frequency domain reflection measurement device | |
| KR101224862B1 (en) | Detecting apparatus and method of failure location in a cable | |
| US20070197169A1 (en) | Systems and methods for transmitter and channel characterization | |
| CN109407026B (en) | Evaluation device and method for ultrahigh frequency partial discharge instrument | |
| van den Biggelaar et al. | Assessment of a contactless characterization method for integrated antennas | |
| CN116348773A (en) | System and method for compensating for power loss due to Radio Frequency (RF) signal probe mismatch in conductive signal testing | |
| CN113253049A (en) | Power distribution network local fault section positioning and active distance measuring device and method | |
| RU2292559C1 (en) | Method of finding damages in distribution netweorks' power lines | |
| CN217741725U (en) | Miniaturized cable and radio frequency port measuring device | |
| CN115856513B (en) | Method and device for detecting railway cable faults, storage medium and electronic device | |
| CN109474332B (en) | Cable fault measurement system based on standing wave measurement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |