CN203445889U - Multi-channel DMR signal monitor - Google Patents
Multi-channel DMR signal monitor Download PDFInfo
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- CN203445889U CN203445889U CN201320547455.6U CN201320547455U CN203445889U CN 203445889 U CN203445889 U CN 203445889U CN 201320547455 U CN201320547455 U CN 201320547455U CN 203445889 U CN203445889 U CN 203445889U
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Abstract
The utility model relates to a multi-channel DMR signal monitor which is composed of a controller, a radio frequency lower frequency converter, an intermediate frequency digitization instrument and a PXIe chassis. The output end of an antenna is connected with the input end of the radio frequency lower frequency converter. The output end of the radio frequency lower frequency converter is connected with the input end of the intermediate frequency digitization instrument through a power divider. The clock output end of the radio frequency lower frequency converter is connected with the reference clock input end of the intermediate frequency digitization instrument. The controller is connected with the radio frequency lower frequency converter and the intermediate frequency digitization instrument through a PXI or PXIe bus. According to the utility model, the virtual instruments are used to complete TDMA time synchronization, 4FSK frequency offset correction and other works to carry out demodulation monitoring on a DMR signal; through module programming, the advantages of software radio and the modular instruments are maximized; a user only needs to add the intermediate frequency digitization instrument, and the number of monitor channels can be increased to improve the performance of the monitor; and the monitor is upgraded, and has high flexibility and easy operability, thus development time and cost are saved.
Description
Technical field
The utility model relates to professional field of wireless communication, is specifically related to a kind of multichannel DMR signal monitoring instrument.
Background technology
In professional moving communicating field in the past, analogue technique by feat of cheap, build easy advantage and be widely used.But, this year, due to highlighting of shortcomings such as using user's rapid development, radio spectrum resources growing tension and the analogue technique self-security of professional wireless telecommunications system not enough, voice quality is low, it is imperative that intercom technical system forwards numeral to from simulation.DMR standard produces under such background.
DMR is the abbreviation of Digital Mobile Radio, it is digital mobile radio, (the European Telecommunication Standard Institute of ETSI, ETSI) be professional mobile radio (Professional Mobile Radio, PMR) the special digital radio standard of formulating of user, early than 2005, get the Green Light, started to be at present widely used by specialty, business and private user all over the world.
In physical layer, DMR is two time slot Time-Division Multiple Access (TDMA) digital communication system, provides flexibly and voice-and-data solution cheaply.In DMR standard, the alternately time slot that the 12.5kHz channel spacing of cellular band regulation on global land is divided into two 30ms, each time slot can be used as the independently channel operation of 6.25kHz, therefore the channel of each 12.5kHz just can be supported two independences or synchronous voice or the supervision requirement of data, services back compatible 6.25KHz channel spacing, thereby has greatly improved band efficiency and user capacity.As digital communication system, DMR standard has adopted 4FSK modulation scheme and digital encoding and decoding technique, with respect to traditional analog intercom system, has suppressed better the impact of noise, and especially the user to covering edge, community, provides better speech quality.This DMR of instructions for use signal monitoring instrument of TDMA and 4FSK possesses good time synchronized and correcting frequency deviation ability.
In operator scheme, DMR standard has three layer operation patterns, respectively: (1) unauthorized (ground floor), for 446MHz frequency band, exempt from licence, be used for consumer applications and the application of lower powered business; (2) authorize conventional (second layer), be included in the conventional radio system of mandate, mobile phone and the portable equipment of PMR frequency range operation, support voice and integrated IP data service; (3) authorize cluster (the 3rd layer), this layer of product can be in the operation of PMR frequency range cluster, the Packet data service of support voice, short message processing and multiple format.As general multichannel DMR signal monitoring instrument, each channel in multichannel needs to support this three kinds of operator schemes.In addition, when this multichannel DMR signal monitoring instrument is also supported to move, test product switches between these three kinds of patterns, the switching that monitor will self adaptation operator scheme.
In channel working method, DMR standard has also been stipulated three kinds: (1) time division duplex I, two logic channel difference transmission of one line business; (2) very half-duplex, single logic channel is for transport service; (3) time division duplex II, a logic channel is for transport service, and another logic channel is used for transmitting backward channel burst.This multi-channel signal monitor can identification channel working method also be monitored this channel adaptively.
About outburst type, DMR according to the information specifies of load four kinds: (1) voice bursts, comprise 264 Bit datas, be used for transferring voice code stream, 6 voice bursts form a voice superframes, in DMR, voice are all to transmit by voice superframes; (2) data or control burst, comprise 264 Bit datas, is used for transmitting data and signaling; (3) public statement channel burst, comprises 24 Bit datas, between two 264 bit burst, is used for data transport and access information, only exists in base station down channel, and for travelling carriage up channel, this part is not launched, as protection interval; (4) backward channel, comprises 96 or 264 Bit datas, is used for transmitting backward signaling.Because the burst length of every type is different, this multichannel DMR signal monitoring instrument need to be identified different outburst types and it is carried out to demodulation.
Summary of the invention
In order to monitor aerial DMR signal, the purpose of this utility model is to propose a kind of multichannel DMR signal monitoring instrument, this monitor is found possible DMR signal by realizing the spectral observation of 20MHz bandwidth, then to these signals identify simultaneously, time synchronized and 4FSK demodulation, output bit data flow also carries out this bit stream flow table and files for follow-up further off-line analysis.For interested signal, this monitor can also carry out flow table file to its raw baseband signal, and monitoring personnel can carry out further physical layer index analysis and protocol conformance analysis etc. to these baseband signals.
The multichannel DMR signal monitoring instrument the utility model proposes, by controller 1, radio frequency down-conversion device 2, if digitization instrument 3 and PXI cabinet 4, formed, antenna output end is connected to the input of radio frequency down-conversion device 2, the output of radio frequency down-conversion device 2 is connected to the input of if digitization instrument 3 by power splitter, the output terminal of clock of radio frequency down-conversion device 2 is connected to the reference clock input of if digitization instrument 3, and controller 1 is connected with radio frequency down-conversion device 2 and if digitization instrument 3 by PXI or the PXIe bus of PXIe cabinet 4 backboards.
In the utility model, each if digitization instrument 3 provides two DMR signal monitoring channels, and if digitization instrument 3 of every increase just increases by two supervisory channels, for the expansion of systematic function provides convenience and flexibility.
This multichannel DMR signal monitoring instrument is totally two kinds of mode of operations, is respectively spectrum monitoring pattern and DMR signal demodulation analysis pattern.Under spectrum monitoring pattern, monitor provides the broader frequency spectrum of 20MHz for user, user only need to arrange the centre frequency of frequency spectrum just can observe the RST in own interested frequency range, situation about arriving according to the observation, and user just can arrange the centre frequency of wanting supervisory channel; Under DMR signal demodulation analysis pattern, if there is DMR signal in monitored channel, user just can observe the bit data flow after the demodulation of DMR signal, and we also can provide the information such as the timestamp of each burst, the type that whether contains synchronous, synchronous type, burst, signal source (base station or travelling carriage) in addition.If user is interested in some signals, under DMR signal demodulation analysis pattern, can also carry out flow table file to the raw baseband signal of this signal, in order to subsequent analysis.If the content of monitored signal is known, under DMR signal demodulation analysis pattern, can also carry out bit error rate test to this signal.
This multichannel DMR signal monitoring instrument utilizes the high degree of flexibility of software radio and modular instrument, with virtual instrument completed time synchronized for TDMA, for the work such as frequency offset correction of 4FSK and then realized the demodulation monitoring to DMR signal.Pass through module programming, bring into play to the full extent the advantage of software radio and modular instrument, thereby user only need to increase the performance that if digitization instrument just can increase the number of channel raising monitor of monitoring, make monitor upgrading possess flexibility and the ease for operation of height, save development time and cost.
Accompanying drawing explanation
Fig. 1 is structural diagrams of the present utility model.
Fig. 2 is the flow chart of the utility model embodiment 1.
Number in the figure: 1 is controller, 2 is radio frequency down-conversion device, 3 is if digitization instrument, 4 is PXI cabinet, 5 is analog to digital converter, and 6 is digital down converter, and 7 is spectrum analysis module, 8 is FM demodulation module, 9 is signal flow table archive module, and 10 is time synchronized module, and 11 is channel and outburst type identification module, 12 is 4FSK demodulation module, and 13 is data flow dish archive module.
Embodiment
Below by specific embodiment, the utility model is further illustrated.
Embodiment 1: controller 1 adopts PXI2-8133, and radio frequency down-conversion device 2 adopts PXI-5600, and if digitization instrument 3 adopts PXIe-5641R, and PXIe cabinet 4 adopts PXIe-1082, and its core bus is PXI and PXIe bus.Antenna output end is connected to the input of radio frequency down-conversion device 2, the output of radio frequency down-conversion device 2 is connected to the input of if digitization instrument 3 by power splitter, the output terminal of clock of radio frequency down-conversion device 2 is connected to the reference clock input of if digitization instrument 3, and controller 1 is connected with radio frequency down-conversion device 2 and if digitization instrument 3 by PXI or the PXIe bus of PXIe cabinet 4 backboards.
This multichannel DMR signal monitoring instrument adopts identical handling process to the DMR signal of each channel, for the expansion of instrument monitoring performance provides flexibility and convenience.For the handling process of single channel DMR signal as shown in Figure 2.First the radiofrequency signal of antenna output obtains intermediate-freuqncy signal by radio frequency down-conversion device 2 down-conversions, and intermediate-freuqncy signal transfers digital medium-frequency signal to by analog to digital converter 5, and digital medium-frequency signal changes to baseband signal by digital down converter 6.To baseband signal, can carry out three kinds of processing to it:
(1) by spectrum analysis module 7, it is carried out to spectrum analysis to observe whether there is the signal of wanting monitoring;
(2) it is carried out to DMR demodulation, if this signal is user want monitoring signal, first baseband signal can demodulate by FM demodulation module 8 phase information of signal, then by 10 pairs of signals of time synchronized module, carry out time synchronized, after time synchronized, by channel and outburst type identification module 11, identify channel and the outburst type of DMR signal, according to identifying channel and outburst type, 12 pairs of signals of 4FSK demodulation module carry out demodulation output bit data flow and by data flow dish archive module 13, its flow table are filed;
(3) baseband signal flow table, if signal is to this interest of this signal, wants to be further analyzed, and monitor also can carry out flow table by baseband signal by signal flow table archive module 9 and file for subsequent analysis.
Claims (1)
1. a multichannel DMR signal monitoring instrument, by controller (1), radio frequency down-conversion device (2), if digitization instrument (3) and PXIe cabinet (4) form, it is characterized in that antenna output end is connected to the input of radio frequency down-conversion device (2), the output of radio frequency down-conversion device (2) is connected to the input of if digitization instrument (3) by power splitter, the output terminal of clock of radio frequency down-conversion device (2) is connected to the reference clock input of if digitization instrument (3), controller (1) is connected with radio frequency down-conversion device (2) and if digitization instrument (3) by PXI or the PXIe bus of PXIe cabinet (4) backboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320547455.6U CN203445889U (en) | 2013-09-04 | 2013-09-04 | Multi-channel DMR signal monitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320547455.6U CN203445889U (en) | 2013-09-04 | 2013-09-04 | Multi-channel DMR signal monitor |
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| CN203445889U true CN203445889U (en) | 2014-02-19 |
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| CN201320547455.6U Expired - Lifetime CN203445889U (en) | 2013-09-04 | 2013-09-04 | Multi-channel DMR signal monitor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717676A (en) * | 2015-03-02 | 2015-06-17 | 东南大学 | PXI-instrument-based wireless communication signal monitoring and analyzing method and system |
| CN109274455A (en) * | 2018-09-05 | 2019-01-25 | 北京众谱达科技有限公司 | Applied to the radio tube control equipment under complex electromagnetic environment |
| CN109379315A (en) * | 2018-12-19 | 2019-02-22 | 田智生 | A kind of method and receiver of automatic identification FM and DMR signal |
| CN112865882A (en) * | 2021-01-19 | 2021-05-28 | 南京中新赛克科技有限责任公司 | Anti-frequency-deviation DMR interphone signal rapid identification method |
-
2013
- 2013-09-04 CN CN201320547455.6U patent/CN203445889U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717676A (en) * | 2015-03-02 | 2015-06-17 | 东南大学 | PXI-instrument-based wireless communication signal monitoring and analyzing method and system |
| CN104717676B (en) * | 2015-03-02 | 2018-03-20 | 东南大学 | A kind of wireless communication signals monitoring analysis system based on PXI instruments |
| CN109274455A (en) * | 2018-09-05 | 2019-01-25 | 北京众谱达科技有限公司 | Applied to the radio tube control equipment under complex electromagnetic environment |
| CN109274455B (en) * | 2018-09-05 | 2024-03-22 | 北京众谱达科技有限公司 | Radio monitoring equipment applied to complex electromagnetic environment |
| CN109379315A (en) * | 2018-12-19 | 2019-02-22 | 田智生 | A kind of method and receiver of automatic identification FM and DMR signal |
| CN112865882A (en) * | 2021-01-19 | 2021-05-28 | 南京中新赛克科技有限责任公司 | Anti-frequency-deviation DMR interphone signal rapid identification method |
| CN112865882B (en) * | 2021-01-19 | 2024-05-10 | 南京中新赛克科技有限责任公司 | Anti-frequency offset DMR interphone signal rapid identification method |
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Granted publication date: 20140219 |
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