CN104052554B - A kind of insertion loss test macro of indoor distributed system - Google Patents
A kind of insertion loss test macro of indoor distributed system Download PDFInfo
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- CN104052554B CN104052554B CN201410243266.9A CN201410243266A CN104052554B CN 104052554 B CN104052554 B CN 104052554B CN 201410243266 A CN201410243266 A CN 201410243266A CN 104052554 B CN104052554 B CN 104052554B
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- 238000005259 measurement Methods 0.000 abstract description 6
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Abstract
The invention discloses a kind of insertion loss test macro of indoor distributed system, comprise Test Host and N number of test terminal; Test Host is connected with the access port of indoor distributed system, and the end of each distribution branch road of indoor distributed system all connects a test terminal; Test Host sends modulation signal by main control system switch, and modulation signal comprises frequency, whole address information; Test terminal receives radiofrequency signal by obtaining baseband coding signal after detector, digital signal is converted into after AD sampling, by terminal single-chip microcomputer decode address and frequency information, the terminal of corresponding address sends the continuous wave radiofrequency signal of corresponding frequencies, and the test terminal of non-corresponding address does not respond; Test Host is after modulation signal sends, and the radiofrequency signal of wait-receiving mode test terminal, calculates the loss of the corresponding frequency of respective channel according to the amplitude of transmitting and the signal amplitude difference receiving measurement; The present invention is more accurate, convenient to the measurement of indoor distributed system Insertion Loss.
Description
Technical field
The present invention relates to a kind of insertion loss test macro of indoor distributed system.
Background technology
As shown in Figure 1, transmit to distribute through room power divider and cable extends to each and covers point existing indoor distributed system, and through multiple aerial radiation out, by designing the radiant power that each covers point, the signal reaching whole region well covers.The device connected due to indoor distributed system and cable progression more, cable is longer, be easy to occur passage portion or Frequency point occur that insertion loss does not meet expection.Due to signal access point and launch point distance, network analyzer cannot be used to measure.
Traditional approach adds transmitting power by access point, at the space radiation signal that area of coverage each point makes field strength measurement device measuring receive, roughly judges passage Insertion Loss situation.Due to the directivity of antenna, polarization and the reflection of radiation signal in space, diffraction, mutually superposition etc., the measured value of diverse location can be caused to have a long way to go, the consistency of test result is also bad, and measurement result is easily by the interference of other space radiation signals simultaneously.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of insertion loss test macro of indoor distributed system is provided.
The object of the invention is to be achieved through the following technical solutions: a kind of insertion loss test macro of indoor distributed system, test indoor distributed system, described indoor distributed system comprises access port and N number of distribution branch road; Described insertion loss test macro comprises Test Host and N number of test terminal; Test Host is connected with the access port of indoor distributed system, and the end of each distribution branch road of indoor distributed system all connects a test terminal;
Described Test Host comprises: host computer, host SCM, signal generator, modulation switch, host switch, receiver, display, described display, host SCM, host switch, receiver are all connected with host computer, modulation switch is all connected with host switch with receiver, signal generator is all connected with modulation switch with host SCM, and signal generator connects host SCM; Described host computer is by the occurrence frequency of host SCM signalization generator, and modulation switch acquiescence disconnects, and host switch is communicated with modulation switch and access port; Terminal address and test frequency are encoded to 32 bit data codes by host computer, in described 32 bit data codes, 1-8 position is the address code of test terminal, 9-20 position is the integer part coding of test frequency, 21-24 position is the fractional part coding of test frequency, and 25-32 position is front 24 exclusive or check positions; 32 bit data codes are sent to host SCM by host computer, host SCM sends numeric data code by the break-make controlling modulation switch, send radiofrequency signal correspondence and send numerical value 1, close radiofrequency signal correspondence and send numerical value 0, host SCM first sends one digit number value 1, sending one digit number value 0 again as sending beginning flag, then sending by turn according to code bit order according to 32 numeric data codes, send one digit number value 0 and one digit number value 1 after sending data again as end mark; The receiving center set of frequency of receiver is test frequency after sending and terminating by Test Host, is switched to by host switch and is communicated with receiver and access port, waits for that test signal is beamed back in test terminal;
Described test terminal comprises: limit switch, numerical-control attenuator, terminal single-chip microcomputer, coupler, voltage-controlled attenuator, terminal signaling source, amplifier, first detector, second detector, test terminal acquiescence is in accepting state, and limit switch is communicated with numerical-control attenuator and distribution branch road, when test terminal receives radiofrequency signal, radiofrequency signal is converted into baseband signal by first detector, baseband signal is converted to digital signal by built-in AD sample port by terminal single-chip microcomputer: terminal single-chip microcomputer reads the data that AD sample port gathers, the amplitude of the baseband signal received is regulated by the pad value controlling numerical-control attenuator, the amplitude of baseband signal is made to drop within the scope of the AD sampled voltage of terminal single-chip microcomputer, terminal single-chip microcomputer compares to determine according to the thresholding of sampled data size and setting the data received, be greater than threshold value explanation and receive data 1, be less than threshold value explanation and receive data 0, according to the coding protocol of Test Host, decode test frequency and terminal address data, and verify, the terminal address received compares with built-in terminal address by terminal single-chip microcomputer, if terminal address is not identical, is not then the object that Test Host is called, does not do any response, if terminal address is identical, be then the object that Test Host is called, terminal Single-chip Controlling terminal signaling source sends the radiofrequency signal of corresponding test frequency, terminal single-chip microcomputer sends a reference voltage to amplifier by built-in DA Port Translation, and amplifier and voltage-controlled attenuator, coupler, second detector form a negative feedback active leveling circuit, terminal Single-chip Controlling limit switch connects coupler and distribution branch road, radiofrequency signal is sent, output radio frequency signal frequency is test frequency, output RF signal power is P2dBm, continue after 2 seconds, terminal single-chip microcomputer is closed a terminal signal source, and terminal Single-chip Controlling limit switch is communicated with numerical-control attenuator and distribution branch road, and test terminal returns acquiescence accepting state,
After Test Host sends coded data, wait for 0.5s, host computer reads the radiofrequency signal range value P1dBm that receiver records, then the Insertion Loss Loss=p2-p1 of corresponding distribution branch road, and wherein, loss Loss is in units of dB.
Beneficial effect of the present invention:
1. the test macro of the present invention's realization, connect multiple test terminal simultaneously, the Insertion Loss that direct measurement access point exports to each branch, can measure the Insertion Loss of indoor distributed system all branches different frequency point rapidly and accurately, compares traditional test of test point one by one more convenient; Compare the mode of traditional measurement space radiation signal, test of the present invention is more accurate;
2. the test macro of the present invention's realization, adopts the mode cost in power meter plus signal source significantly to decline than tradition, is applicable to large-scale promotion application;
3. the test macro volume of the present invention's realization is little, and be easy to carry transport, is particularly suitable for indoor distributed system test;
4. the test macro power consumption of the present invention's realization is little, and Test Host can adopt lithium battery power supply, test terminal can adopt dry cell power supply, thoroughly breaks away from power supply restriction.
Accompanying drawing explanation
Fig. 1 is indoor distributed system block diagram;
Fig. 2 is test macro connection layout;
Fig. 3 is Test Host theory diagram;
Fig. 4 is test terminal theory diagram;
Fig. 5 is insertion loss test system and test flow chart;
Fig. 6 is encoded bitmap explanation.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 2, the insertion loss test macro of a kind of indoor distributed system of the present invention, tests indoor distributed system, and described indoor distributed system comprises access port 019 and N number of distribution branch road 020; Described test macro comprises Test Host 018 and N number of test terminal 021, and each test terminal 021 has unique address; Test Host 018 is connected with the access port 019 of indoor distributed system, and the end of each distribution branch road 020 of indoor distributed system all connects a test terminal 021.
As shown in Figure 3, Test Host comprises: host computer 004, host SCM 008, signal generator 001, modulation switch 002, host switch 005, receiver 007, display 003, described display 003, host SCM 008, host switch 005, receiver 007 are all connected with host computer 004, modulation switch 002 is all connected with host switch 005 with receiver 007, signal generator 001 is all connected with modulation switch 002 with host SCM 008, and signal generator 001 connects host SCM 008; Described host computer 004 is by host SCM 008(STM32F100) occurrence frequency (signal generator can use the ad4350 phase-locked loop chip of ADI to realize) of signalization generator 001, modulation switch 002 gives tacit consent to disconnection, and host switch 005 is communicated with modulation switch 002 and access port 019(modulation switch 002 and main frame 005 can use HITTITEHMC544 switch chip); Terminal address and test frequency are encoded to 32 bit data codes by host computer 004, as shown in Figure 6, in described 32 bit data codes, 1-8 position is the address code of test terminal 021,9-20 position is the integer part coding of test frequency, 21-24 position is the fractional part coding of test frequency, and 25-32 position is front 24 exclusive or check positions; 32 bit data codes are sent to host SCM 008 by host computer 004, host SCM 008 sends numeric data code by the break-make controlling modulation switch 002, send radiofrequency signal correspondence and send numerical value 1, close radiofrequency signal correspondence and send numerical value 0, host SCM 008 first sends one digit number value 1, sending one digit number value 0 again as sending beginning flag, then sending by turn according to code bit order according to 32 numeric data codes, send one digit number value 0 and one digit number value 1 after sending data again as end mark; Each code bit duration 100ms; The receiving center set of frequency of receiver 007 is test frequency after sending and terminating by Test Host, is switched to by host switch 005 and is communicated with receiver 007 and access port 019, waits for that test signal is beamed back in test terminal 021.
As shown in Figure 4, test terminal 021 comprises: limit switch 009, numerical-control attenuator 010, terminal single-chip microcomputer 017, coupler 012, voltage-controlled attenuator 013, terminal signaling source 014, amplifier 016, first detector 011, second detector 015; Test terminal 021 acquiescence is in accepting state, limit switch 009 is communicated with numerical-control attenuator 010 and distribution branch road 020, when test terminal 021 receives radio frequency letter wave detector 011, radiofrequency signal is converted into baseband signal, terminal single-chip microcomputer 017 is by after built-in number, by an AD sample port, baseband signal is converted to digital signal, sample rate is 100HZ.Terminal single-chip microcomputer 017 reads the data that AD sample port gathers, the amplitude of the baseband signal received is regulated by the pad value controlling numerical-control attenuator 010, the amplitude of baseband signal is made to drop within the scope of the AD sampled voltage of terminal single-chip microcomputer 017, terminal single-chip microcomputer 017 compares to determine according to the thresholding of sampled data size and setting the data received, be greater than threshold value explanation and receive data 1, be less than threshold value explanation and receive data 0, according to the coding protocol of Test Host 018, decode test frequency and terminal address data, and verify.The terminal address received compares with built-in terminal address by terminal single-chip microcomputer 017, if terminal address is not identical, is not then the object that Test Host 018 is called, does not do any response; If terminal address is identical, be then the object that Test Host 018 is called, terminal single-chip microcomputer 017 control terminal signal source 014 sends the radiofrequency signal of corresponding test frequency; Terminal single-chip microcomputer 017 sends a reference voltage to amplifier 016 by built-in DA Port Translation, and amplifier 016 and voltage-controlled attenuator 013, coupler 012, second detector 015 form a negative feedback active leveling circuit; Such power output is controlled by built-in DA port output level by terminal single-chip microcomputer 017, and under different signal frequencies, ambient temperature, power output also can keep stable and consistent.Terminal single-chip microcomputer 017 control terminal switch 009 connects coupler 012 and distribution branch road 020, radiofrequency signal is sent, output radio frequency signal frequency is test frequency, output RF signal power is P2dBm, after 2 seconds duration, terminal single-chip microcomputer 017 is closed a terminal signal source 014, and terminal single-chip microcomputer 017 control terminal switch 009 is communicated with numerical-control attenuator 010 and distribution branch road 020, and test terminal 021 returns acquiescence accepting state.
As shown in Figure 5, after Test Host 018 sends coded data, wait for 0.5s, host computer 004 reads the radiofrequency signal range value P1dBm that receiver 007 records, then the Insertion Loss Loss=p2-p1 of corresponding distribution branch road, and loss is here in units of dB.Host computer 004 is by frequency, counterpart terminal address, the tables of data of Insertion Loss value information stored in host computer 004.
Host computer 004 changes test frequency, repeats above test, just can obtain the Insertion Loss information of multiple Frequency point; Change terminal address code, can test the Insertion Loss information of other branch roads.
Claims (1)
1. an insertion loss test macro for indoor distributed system, tests indoor distributed system, and described indoor distributed system comprises access port (019) and N number of distribution branch road (020); It is characterized in that, described insertion loss test macro comprises Test Host (018) and N number of test terminal (021); Test Host (018) is connected with the access port (019) of indoor distributed system, and the end of each distribution branch road (020) of indoor distributed system all connects a test terminal (021);
Described Test Host comprises: host computer (004), host SCM (008), signal generator (001), modulation switch (002), host switch (005), receiver (007), display (003), described display (003), host SCM (008), host switch (005), receiver (007) is all connected with host computer (004), modulation switch (002) is all connected with host switch (005) with receiver (007), signal generator (001) is all connected with modulation switch (002) with host SCM (008), signal generator (001) connects host SCM (008), described host computer (004) is by the occurrence frequency of host SCM (008) signalization generator (001), and modulation switch (002) acquiescence disconnects, and host switch (005) is communicated with modulation switch (002) and access port (019), terminal address and test frequency are encoded to 32 bit data codes by host computer (004), in described 32 bit data codes, 1-8 position is the address code of test terminal (021), 9-20 position is the integer part coding of test frequency, 21-24 position is the fractional part coding of test frequency, and 25-32 position is front 24 exclusive or check positions, 32 bit data codes are sent to host SCM (008) by host computer (004), host SCM (008) sends numeric data code by the break-make controlling modulation switch (002), send radiofrequency signal correspondence and send numerical value 1, close radiofrequency signal correspondence and send numerical value 0, host SCM (008) first sends one digit number value 1, send one digit number value 0 again as sending beginning flag, then send by turn according to code bit order according to 32 numeric data codes, send one digit number value 0 and one digit number value 1 after sending data again as end mark, the receiving center set of frequency of receiver (007) is test frequency after sending and terminating by Test Host, is switched to by host switch (005) and is communicated with receiver (007) and access port (019), waits for that test signal is beamed back in test terminal (021),
Described test terminal (021) comprising: limit switch (009), numerical-control attenuator (010), terminal single-chip microcomputer (017), coupler (012), voltage-controlled attenuator (013), terminal signaling source (014), amplifier (016), first detector (011), second detector (015), test terminal (021) acquiescence is in accepting state, and limit switch (009) is communicated with numerical-control attenuator (010) and distribution branch road (020), when test terminal (021) receives radiofrequency signal, radiofrequency signal is converted into baseband signal by first detector (011), baseband signal is converted to digital signal by built-in AD sample port by terminal single-chip microcomputer (017): terminal single-chip microcomputer (017) reads the data that AD sample port gathers, the amplitude of the baseband signal received is regulated by the pad value controlling numerical-control attenuator (010), the amplitude of baseband signal is made to drop within the scope of the AD sampled voltage of terminal single-chip microcomputer (017), terminal single-chip microcomputer (017) compares to determine according to the thresholding of sampled data size and setting the data received, be greater than threshold value explanation and receive data 1, be less than threshold value explanation and receive data 0, according to the coding protocol of Test Host (018), decode test frequency and terminal address data, and verify, the terminal address received compares with built-in terminal address by terminal single-chip microcomputer (017), if terminal address is not identical, is not then the object that Test Host (018) is called, does not do any response, if terminal address is identical, be then the object that Test Host (018) is called, terminal single-chip microcomputer (017) control terminal signal source (014) sends the radiofrequency signal of corresponding test frequency, terminal single-chip microcomputer (017) sends a reference voltage to amplifier (016) by built-in DA Port Translation, and amplifier (016) and voltage-controlled attenuator (013), coupler (012), second detector (015) form a negative feedback active leveling circuit, terminal single-chip microcomputer (017) control terminal switch (009) connects coupler (012) and distribution branch road (020), radiofrequency signal is sent, output radio frequency signal frequency is test frequency, output RF signal power is P2dBm, continue after 2 seconds, terminal single-chip microcomputer (017) is closed a terminal signal source (014), and terminal single-chip microcomputer (017) control terminal switch (009) is communicated with numerical-control attenuator (010) and the branch road (020) that distributes, and test terminal (021) returns acquiescence accepting state,
After Test Host (018) sends coded data, wait for 0.5s, host computer (004) reads the radiofrequency signal range value P1dBm that receiver (007) records, then the Insertion Loss Loss=P2-P1 of corresponding distribution branch road, and wherein, loss Loss is in units of dB.
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| US8045643B1 (en) * | 2007-05-04 | 2011-10-25 | Rf Micro Devices, Inc. | Forward and reverse VSWR insensitive power detection using quadrature downconversion |
| CN202256521U (en) * | 2011-09-05 | 2012-05-30 | 瞿纯昊 | S parameter measurement device |
| CN202916347U (en) * | 2012-10-25 | 2013-05-01 | 西安开容电子技术有限责任公司 | Insertion loss test device of filtering and shielding integrated assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8045643B1 (en) * | 2007-05-04 | 2011-10-25 | Rf Micro Devices, Inc. | Forward and reverse VSWR insensitive power detection using quadrature downconversion |
| CN202256521U (en) * | 2011-09-05 | 2012-05-30 | 瞿纯昊 | S parameter measurement device |
| CN202916347U (en) * | 2012-10-25 | 2013-05-01 | 西安开容电子技术有限责任公司 | Insertion loss test device of filtering and shielding integrated assembly |
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Effective date of registration: 20211209 Address after: 310000 floor 2, block a, No. 581, torch Avenue, Binjiang District, Hangzhou, Zhejiang Patentee after: Hangzhou Ziguang Communication Technology Co.,Ltd. Address before: 311799 No. 155 Gushan Avenue, Qiandaohu Town, Chun'an County, Hangzhou City, Zhejiang Province Patentee before: HANGZHOU JOINTCOM COMMUNICATION TECHNOLOGY Co.,Ltd. |
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Denomination of invention: An Insertion Loss Testing System for Indoor Distribution Systems Effective date of registration: 20230719 Granted publication date: 20160120 Pledgee: Hangzhou High-tech Financing Guarantee Co.,Ltd. Pledgor: Hangzhou Ziguang Communication Technology Co.,Ltd. Registration number: Y2023330001519 |
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Granted publication date: 20160120 Pledgee: Hangzhou High-tech Financing Guarantee Co.,Ltd. Pledgor: Hangzhou Ziguang Communication Technology Co.,Ltd. Registration number: Y2023330001519 |