CN203608207U - Analog receiver electromagnetic interference sensitivity testing system - Google Patents
Analog receiver electromagnetic interference sensitivity testing system Download PDFInfo
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- CN203608207U CN203608207U CN201320771751.4U CN201320771751U CN203608207U CN 203608207 U CN203608207 U CN 203608207U CN 201320771751 U CN201320771751 U CN 201320771751U CN 203608207 U CN203608207 U CN 203608207U
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Abstract
The utility model discloses an analog receiver electromagnetic interference sensitivity testing system. The system at least comprises a signal source I and a signal source II which generate analog modulation signals, a signal source joint control circuit, a combiner, and an audio analyzer, wherein the signal source I, the signal source II, the signal source joint control circuit and the audio analyzer are separately connected into an IEEE-488 bus interface circuit connected to a computer. The signal source joint control circuit is separately connected to the signal source I and the signal source II which are both connected to the combiner. The system integrates the signal sources, the combiner and the audio analyzer into one cabinet, leaving only an output interface and an input interface. For a receiver under test, it is only necessary to connect two circuits, and thus connection becomes simpler. The signal source joint control circuit is configured to be able to control one or more signal sources simultaneously and is connected to the IEEE-488 bus interface circuit, so that remote operation can be achieved.
Description
Technical field
The utility model relates to a kind of radio system electromagnetic interference Susceptivity testing system, relates in particular to a kind of analog receiver electromagnetic interference Susceptivity testing system.
Background technology
Along with the development of wireless communication technology, the application of Wireless Telecom Equipment greatly facilitates people's production and life, but Wireless Telecom Equipment of a great variety, model is different, thing followed electromagnetic interference EMI(Electronic Magnetic Interference) phenomenon is also day by day serious, and present, covering bandwidth many with equipment frequently, the overlapping serious feature of frequency interleave, very easily occur that the electromagnetism between system disturbs mutually, even cause communication disruption, system down, have a strong impact on the overall efficiency of radio system.Therefore, carrying out radio system electromagnetic compatibility research and electromagnetic interference susceptibility tests and has very important meaning.
Carry out receiver electromagnetic susceptibility EMS(Electronic Magnetic Susceptibility) object of test is to obtain the susceptibility threshold of receiver, receiver is subject to the critical level of cisco unity malfunction after electromagnetic interference.For the electromagnetic interference susceptibility test of the artificial antenna such as amplitude modulation and frequency modulation electric system, utilize two-way or multipath signal source to generate respectively modulated-analog signal, be created on the signal that is disturbed in operation of receiver frequency range by mixer, detect receiver output signal-to-noise ratio; Conditioning signal source output signal level, in the time that receiver audio output reaches normal response, incoming signal level is critical level, reflects the electromagnetic interference sensitiveness of receiver, and this research of electromagnetic compatibility for receiver performance characteristics analysis and radio system has important value.In existing analog receiver susceptibility method of testing, generally can only be by manually selecting signal source, in addition, existing test macro connects inconvenient, the equipment such as two paths of signals source, mixer and audio analyzer are separate, and the connection of test macro is wasted time and energy; And, in test process, need the output of two signal sources of while manual adjustments very difficult, testing efficiency is lower.
Utility model content
The purpose of this utility model is just to provide a kind of analog receiver electromagnetic interference Susceptivity testing system, to solve, background technology is existing can only pass through manually selection signal source, waste time and energy, test macro connects inconvenient, two signal sources of manual adjustments are very difficult simultaneously, the problem that testing efficiency is lower.
For achieving the above object, the utility model is by the following technical solutions:
The utility model at least comprises and produces the signal source I of modulated-analog signal and signal source II, signal source joint control circuit, mixer, audio analyzer; Wherein signal source I, signal source II, signal source joint control circuit and audio analyzer are connected respectively in the IEEE-488 bus interface circuit being connected with computer; Signal source joint control circuit is connected with signal source II with signal source I respectively, and signal source I is all connected with mixer with signal source II; Described signal source I, signal source II, signal source joint control circuit, mixer and audio analyzer is integrated is arranged in cabinet.
The utility model also comprises filter/attenuator I and filter/attenuator II, and signal source I is connected with mixer with filter/attenuator II by filter/attenuator I respectively with signal source II.
Described signal source joint control circuit comprises microprocessor, microprocessor respectively with Operation display module, the signal source I and the signal source II that are connected with mixer, and the IEEE-488 bus interface adapter being connected with IEEE-488 bus interface circuit.
Described microprocessor is the MC68000 of Motorola microprocessor.
Described Operation display module comprises signal source state display screen, signal source selector switch and signal source functional areas button, and signal source state display screen, signal source selector switch and signal source functional areas button are connected with microprocessor respectively.
Described signal source state display screen is dot matrix LED display screen.
It also comprises signal source III and signal source IV, and signal source joint control circuit is connected with signal source IV with signal source III respectively, and signal source III is all connected with mixer with signal source IV.
It also comprises filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator IV, and signal source I, signal source II, signal source III and signal source IV are connected with mixer by filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator IV respectively.
Compared with prior art, the utility model is integrated into signal source, mixer, audio analyzer etc. in a cabinet, only stays output and two interfaces of input, and this is for tested receiver, only need to connect two circuits just passable, thereby connection becomes simpler; The setting of signal source joint control circuit not only can synchronization to one or more signal source control, and signal source joint control circuit is connected with IEEE-488 bus interface circuit, staff can remote operation; The utility model of employing such scheme can be realized the content of analog receiver sensitivity test is comprised to the susceptibility of receiver for co-channel interference, adjacent frequency interference, intermodulation distortion, Intermodulation Interference, barrage jamming, mixing interference and reciprocal mixing interference etc., can be applicable to the application scenario of multiple analog receiver electromagnetic susceptibility test, and it is simple and easy to do to have test, conveniently feature.
Accompanying drawing explanation
Fig. 1 is the utility model analog receiver electromagnetic interference Susceptivity testing system schematic diagram;
Fig. 2 is the structural representation of signal source joint control circuit in the utility model.
Fig. 3 is the utility model analog receiver electromagnetic interference susceptibility method of testing flow chart.
Embodiment
As shown in Figure 1, the utility model at least comprises and produces the signal source I of modulated-analog signal and signal source II, signal source joint control circuit, mixer, audio analyzer; Wherein signal source I, signal source II, signal source joint control circuit and audio analyzer are connected respectively in the IEEE-488 bus interface circuit being connected with computer; Signal source joint control circuit is connected with signal source II with signal source I respectively, and signal source I is all connected with mixer with signal source II.
Wherein, signal source I and signal source II are two and have the multiband of identical service behaviour, the signal generator of many Modulation Types, can generate the analog signal of the Modulation Types such as frequency modulation (FM), amplitude modulation (AM), and there is larger output power range, for example power bracket is-130dBm ~ 20dBm.
Mixer is a kind of multiband mixer, the output of mixer is connected with tested receiver, tested receiver is connected with audio analyzer, and audio analyzer analysis has multi-frequency audio signal signal to noise ratio measuring ability, and it can detect the output signal-to-noise ratio of tested receiver.
As shown in Figure 2, the utility model signal source joint control main circuit will comprise microprocessor, signal source state display screen, signal source selector switch, signal source functional areas button and IEEE-488 bus interface adapter.Wherein, signal source state display screen is for the output signal pattern of display source signal joint control state and signal source I and signal source II; Signal source selector switch is realized the independent control to signal source I and signal source II or is jointly controlled; Signal source functional areas button is realized setting and the adjusting of signal source I and signal source II output signal pattern; Microprocessor, for the processing of signal source selection, setting, adjusting and Far end control signal, outputs control signals to signal source I and signal source II; IEEE-488 bus interface adapter, for the conversion of microprocessor and far-end computer signal, is realized the transmitted in both directions of signal source state and computer instruction.In a kind of typical signal source joint control circuit, microprocessor adopts the MC68000 of Motorola microprocessor, and signal source state display screen adopts dot matrix LED display screen.In the time that needs are exported one-channel signal, select signal source I or signal source II by signal source selector switch, in pattern and the power output of signal source functional areas setting signal source I or signal source II; In the time that needs regulate two paths of signals simultaneously, select the joint control pattern of signal source I and signal source II by signal source selector switch, set simultaneously and change signal source I and signal source II pattern and power output.
The utility model can also be by the system integration, by signal source I and signal source II, signal source joint control circuit, mixer, audio analyzer is integrated is arranged in cabinet, builds Portable integrated analog receiver electromagnetic susceptibility testing system platform.
As improvement of the present utility model: the utility model also comprises filter/attenuator I and filter/attenuator II, and signal source I is connected with mixer with filter/attenuator II by filter/attenuator I respectively with signal source II.In the time that the signal frequency of signal source I or signal source II output is excessive, can carry out filtering and attenuation processing to the signal of signal source I or the output of signal source II by filter/attenuator I or filter/attenuator II, acquisition meets the analog signal of tested receiver power and frequency range, to avoid causing because of misoperation the situation of the excessive damage tested receiver of signal source power output.
As described in Figure 3, the step of the method for testing of analog receiver electromagnetic interference Susceptivity testing system is:
Step 1: by signal source joint control circuit selection signal source I, signal source I output single channel modulation signal is to filter/attenuator I, filter/attenuator I outputs signal to mixer, the radiofrequency signal of mixer output exports tested receiver to, tested receiver output audio signal is to audio analyzer, in the time that audio signal reaches normal response, the power output of tracer signal source I;
Step 2: by signal source joint control circuit selection signal source II, signal source II output single channel modulation signal is to filter/attenuator II, filter/attenuator II outputs signal to mixer, the radiofrequency signal of mixer output exports tested receiver to, tested receiver output audio signal is to audio analyzer, in the time that audio signal reaches normal response, the power output of tracer signal source II;
Step 3: by signal source joint control circuit joint control signal source I and signal source II, simulate respectively useful signal or interference signal, input to respectively filter/attenuator I and filter/attenuator II, filter/attenuator I and filter/attenuator II output signal to mixer, mixer output composite signal is to tested receiver, tested receiver output audio signal is to audio analyzer, in the time that audio signal reaches normal response, and the critical power output of tracer signal source I and signal source II;
Step 4: according to measurement result, calculate tested receiver electromagnetic interference susceptibility.
As further improvement of the utility model: the utility model also comprises signal source III and signal source IV, signal source joint control circuit is connected with signal source IV with signal source III respectively, signal source III is all connected with mixer with signal source IV, can measure like this susceptibility that tested receiver is disturbed multiple signals, increase test function.
The utility model also comprises filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator IV, and signal source I, signal source II, signal source III and signal source IV are connected with mixer by filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator IV respectively.By filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator IV, signal source I, signal source II, signal source III and signal source IV are carried out to filtering and attenuation processing, obtain the analog signal that is applicable to input tested receiver, to avoid the situation because of the excessive damage tested receiver of signal power of signal source I, signal source II, signal source III and the output of signal source IV.
For method of testing of the present utility model is better described, set forth as an example of measurement AM receiver third order intermodulation inhibition degree example below:
Step 1: by signal source joint control circuit, make signal source II be output as zero, the Modulation Types of signalization source I is amplitude modulation (AM), and the frequency of conditioning signal source I is to tested receiver tuned frequency
;
Step 2: the power output of conditioning signal source I, makes the output of tested receiver audio frequency reach normal response, the power output of tracer signal source I
;
Step 3: by signal source joint control circuit, make signal source I be output as zero, the Modulation Types of signalization source II is amplitude modulation (AM), and the frequency of conditioning signal source II is to tested receiver tuned frequency
;
Step 4: the power output of conditioning signal source II, makes the output of tested receiver audio frequency reach normal response, the power output of tracer signal source II
;
Step 5: the frequency of conditioning signal source I is
, and
, wherein
for the maximum bandwidth of tested receiver;
Step 6: the frequency of conditioning signal source II is
, and
, have
, i.e. the third order intermodulation of signal source I and signal source II falls in the working band of tested receiver;
Step 7: by signal source joint control circuit, the power output of simultaneous equal conditioning signal source I and signal source II, until normal response (tested receiver audio frequency Signal-to-Noise-and-distortion ratio SIAND appears in tested receiver
), record the now power output of signal source I and signal source II and be respectively
with
;
Step 8: can pass through shutdown signal source I and signal source II, judge when response appears in receiver, whether input signal is inter-modulated signal.If inter-modulated signal causes receiver to produce normal response, calculate receiver third order intermodulation inhibition degree and be:
Step 9: return to step 1, change tested receiver operating frequency
, can measure different frequency time, the third order intermodulation inhibition degree of tested receiver;
Step 10: can pass through IEEE-488 bus interface circuit, realize above-mentioned measuring process on far-end computer, obtain inhibition degree result of calculation.
Because above-mentioned embodiment is only to allow technical staff better understand the utility model, therefore, the utility model person of ordinary skill in the field can make an amendment or supplement or adopt similar mode to substitute described execution mode, for example increase multipath signal source (more than four tunnels), the susceptibility that test receiver disturbs many signals, but do not depart from the utility model or surmount the defined scope of affiliated claim.
Claims (8)
1. an analog receiver electromagnetic interference Susceptivity testing system, is characterized in that: which comprises at least and produce the signal source I of modulated-analog signal and signal source II, signal source joint control circuit, mixer, audio analyzer; Wherein signal source I, signal source II, signal source joint control circuit and audio analyzer are connected respectively in the IEEE-488 bus interface circuit being connected with computer; Signal source joint control circuit is connected with signal source II with signal source I respectively, and signal source I is all connected with mixer with signal source II; Described signal source I, signal source II, signal source joint control circuit, mixer and audio analyzer is integrated is arranged in cabinet.
2. analog receiver electromagnetic interference Susceptivity testing system according to claim 1, it is characterized in that: it also comprises filter/attenuator I and filter/attenuator II, signal source I is connected with mixer with filter/attenuator II by filter/attenuator I respectively with signal source II.
3. analog receiver electromagnetic interference Susceptivity testing system according to claim 1, it is characterized in that: described signal source joint control circuit comprises microprocessor, microprocessor respectively with Operation display module, the signal source I and the signal source II that are connected with mixer, and the IEEE-488 bus interface adapter being connected with IEEE-488 bus interface circuit.
4. analog receiver electromagnetic interference Susceptivity testing system according to claim 3, is characterized in that: described microprocessor is the MC68000 of Motorola microprocessor.
5. analog receiver electromagnetic interference Susceptivity testing system according to claim 3, it is characterized in that: described Operation display module comprises signal source state display screen, signal source selector switch and signal source functional areas button, signal source state display screen, signal source selector switch and signal source functional areas button are connected with microprocessor respectively.
6. analog receiver electromagnetic interference Susceptivity testing system according to claim 5, is characterized in that: described signal source state display screen is dot matrix LED display screen.
7. analog receiver electromagnetic interference Susceptivity testing system according to claim 1, it is characterized in that: it also comprises signal source III and signal source IV, signal source joint control circuit is connected with signal source IV with signal source III respectively, and signal source III is all connected with mixer with signal source IV.
8. analog receiver electromagnetic interference Susceptivity testing system according to claim 6, it is characterized in that: it also comprises filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator IV, signal source I, signal source II, signal source III and signal source IV are connected with mixer by filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator IV respectively.
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|---|---|---|---|
| CN201320771751.4U CN203608207U (en) | 2013-11-29 | 2013-11-29 | Analog receiver electromagnetic interference sensitivity testing system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683046B (en) * | 2013-11-29 | 2018-07-17 | 中国人民解放军63888部队 | A kind of analog receiver electromagnetic interference susceptibility test method and system |
| CN112637941A (en) * | 2020-12-16 | 2021-04-09 | 中电科航空电子有限公司 | Out-of-band radiation adjustment system and method for airborne electromagnetic wave equipment |
| CN112666504A (en) * | 2020-12-01 | 2021-04-16 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Portable detection equipment of digital instantaneous frequency measurement receiver |
-
2013
- 2013-11-29 CN CN201320771751.4U patent/CN203608207U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683046B (en) * | 2013-11-29 | 2018-07-17 | 中国人民解放军63888部队 | A kind of analog receiver electromagnetic interference susceptibility test method and system |
| CN112666504A (en) * | 2020-12-01 | 2021-04-16 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Portable detection equipment of digital instantaneous frequency measurement receiver |
| CN112637941A (en) * | 2020-12-16 | 2021-04-09 | 中电科航空电子有限公司 | Out-of-band radiation adjustment system and method for airborne electromagnetic wave equipment |
| CN112637941B (en) * | 2020-12-16 | 2023-03-24 | 中电科航空电子有限公司 | Out-of-band radiation adjustment system and method for airborne electromagnetic wave equipment |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20141129 |
|
| EXPY | Termination of patent right or utility model |