CN203894401U - Signal detection system applied to electric wave darkroom - Google Patents
Signal detection system applied to electric wave darkroom Download PDFInfo
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- CN203894401U CN203894401U CN201420301801.7U CN201420301801U CN203894401U CN 203894401 U CN203894401 U CN 203894401U CN 201420301801 U CN201420301801 U CN 201420301801U CN 203894401 U CN203894401 U CN 203894401U
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- anechoic chamber
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Abstract
The utility model discloses a signal detection system applied to an electric wave darkroom. The system is characterized by comprising a preamplifier, a signal processing device, a comb signal generator, a transmitter antenna and a receiver antenna. The comb signal generator is connected with the transmitter antenna, and the receiver antenna is connected with the signal processing device through the preamplifier. The comb signal generator connected with the transmitter antenna generates electromagnetic signals, the signals are transmitted continuously in all frequency range, and the amplitude of the signal of each frequency point is fixed. There is no need to connect the comb signal generator with the signal processing device, so that signal attenuation is reduced, and the accuracy of signal testing is improved.
Description
Technical field
The utility model relates to signal measurement technique field, particularly relates to a kind of signal detection system that is applied to anechoic chamber.
Background technology
Anechoic chamber, is current the most widely used electromagnetic compatibility test place, and in electromagnetic compatibility test, the parameter of anechoic chamber,, as voltage standing wave ratio (VSWR) directly affects the reliability of test data.The current voltage standing wave ratio (VSWR) detection method of anechoic chamber,, conventionally use one can synchronous control signal transmitting and the network analyzer of signal reception.The end that transmits connects with emitting antenna with coaxial cable, and receiving antenna is connected to prime amplifier, then with coaxial cable, prime amplifier is received to the receiving end of network analyzer.
But because transmitter-receiver device is all in outside, darkroom, the length of coaxial cable is conventionally longer, general more than 15 meters, long coaxial cable signal attenuation is very large, can reduce test accuracy.
Utility model content
Based on this, be necessary the detection method for the voltage standing wave ratio (VSWR) of above-mentioned anechoic chamber,, signal attenuation is very large, can reduce the problem of test accuracy, and a kind of signal detection system that is applied to anechoic chamber, is provided.
A kind of signal detection system that is applied to anechoic chamber,, comprise prime amplifier, signal processing apparatus, pectination signal generator, emitting antenna and receiving antenna, described pectination signal generator is connected with described emitting antenna, and described receiving antenna is connected with described signal processing apparatus by described prime amplifier.
The above-mentioned signal detection system that is applied to anechoic chamber,, generates electromagnetic wave signal by be connected pectination signal generator with emitting antenna, can the simultaneously constant transmitted signal of full frequency band, and each frequency signal amplitude is fixed.Without frequency and the amplitude of adjusting pectination signal generator, can save the test duration, and then reduce testing cost.In addition without pectination signal generator is connected with signal processing apparatus, can reduce signal attenuation, and then improve the accuracy of signal testing.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model is applied to signal detection system first embodiment of anechoic chamber;
Fig. 2 is the structural representation that the utility model is applied to signal detection system second embodiment of anechoic chamber;
Fig. 3 is the testing standard schematic diagram of the utility model signal detection system of being applied to anechoic chamber.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, Fig. 1 is the structural representation that is applied to signal detection system first embodiment of anechoic chamber, of the present utility model.
Described in present embodiment, be applied to the signal detection system of anechoic chamber,, can comprise prime amplifier 200, signal processing apparatus 100, pectination signal generator 400, emitting antenna 500 and receiving antenna 300, pectination signal generator 400 is connected with emitting antenna 500, and receiving antenna 300 is connected with signal processing apparatus 100 by prime amplifier 200.
The signal detection system that is applied to anechoic chamber, described in present embodiment, generates electromagnetic wave signal by be connected pectination signal generator with emitting antenna, can the simultaneously constant transmitted signal of full frequency band, and each frequency signal amplitude is fixed.Without frequency and the amplitude of adjusting pectination signal generator, can save the test duration, and then reduce testing cost.In addition without pectination signal generator is connected with signal processing apparatus, can reduce signal attenuation, and then improve the accuracy of signal testing.
Wherein, for anechoic chamber,, can be an electromagnetic compatibility test space used, described space is six shields through shielding design, and portion is coated with electromagnetic wave absorption material within it, is used for completely cutting off extraneous electromagnetic wave.Construct one without electromagnetic environment.
For pectination signal generator 400 (comb-shaped signal source), be used for generating electromagnetic wave signal, be connected with emitting antenna 500, the continuous equally spaced signal of transmitting that can be continual and steady, due to the signal of its transmitting uniformly-spaced, pectination signal generator 400 is connected with emitting antenna 500, can launch a series of uniformly-spaced signal.
Preferably, pectination signal generator 400, emitting antenna 500 and receiving antenna 300 are arranged in anechoic chamber.Can test anechoic chamber, place standing-wave ratio (SWR), anechoic chamber, normalization decay etc.
Preferably, pectination signal generator 400 can comprise the pectination signal generator that generation signal frequency is 1GHz to 18GHz, can generate anechoic chamber, place standing-wave ratio (SWR) and test required electromagnetic wave signal.
Preferably, pectination signal generator 400 can comprise that generating signal frequency is the pectination signal generator that comprises 18MHz to 30GHz.Can generate the required electromagnetic wave signal of anechoic chamber, normalization attenuation test.
In one embodiment, the pectination signal generator 400 being arranged in anechoic chamber, is connected with emitting antenna 500 by coaxial cable.Pectination signal generator can be placed on the raised floor of anechoic chamber.The length of described coaxial cable is less than or equal to 3 meters further.
Receiving antenna 300 is for receiving described electromagnetic wave signal, and prime amplifier 200 is transferred to signal processing apparatus 100 for the electromagnetic wave signal that receiving antenna 300 is received.
For signal processing apparatus 100, can comprise frequency spectrograph, receiver or network analyzer etc.
Refer to Fig. 2, Fig. 2 is the structural representation that is applied to signal detection system second embodiment of anechoic chamber, of the present utility model.
The signal detection system that is applied to anechoic chamber, described in present embodiment is with the difference of the first embodiment: pectination signal generator 400 comprises mu balanced circuit 420, crystal oscillating circuit 430, frequency division selection circuit 440, frequency division shaping circuit 450, step shaping circuit 460, balanced output circuit 470 and the attenuator 480 being connected successively.
Present embodiment, generates all stable electromagnetic wave signals of frequency and amplitude, can greatly improve the degree of accuracy of signal testing.
Preferably, pectination signal generator 400 also can comprise supply module 410 (being comprised of internal battery) and the output terminal being connected with mu balanced circuit.
Preferably, the fixed frequency signal that crystal oscillating circuit 430 produces, by step shaping circuit 460, produces very precipitous square-wave signal, has passed through the higher harmonic components that Fourier transform can show fundamental signal on frequency spectrum.As the square-wave signal with 50MHz by radiation after, what on spectrum curve, just can produce is to take the comb spectrum signal that 50MHz is frequency interval.
The following stated is that the signal detection system that is applied to anechoic chamber, of the present utility model is applied in the test of anechoic chamber, place standing-wave ratio (SWR).
When carrying out the standing-wave ratio (SWR) test of anechoic chamber, place, CISPR 16-1-4 standard (CCIR's standard, INTERNATIONAL STANDARD) is preferably installed and tests.As shown in Figure 3, in the process of test, each position in CISPR 16-1-4 standard-required test anechoic chamber, (to test altogether anechoic chamber, before, in, left and right, at least 4 positions altogether) position near the ratio of each magnitude of voltage of 6 points (F1aF6, C1aC6, L1aL6, R1aR6), require maximum to be no more than 6dB.When measuring, make signal stabilization, use the signal of same amplitude to launch, after having changed 6 positions, by receiver, receive signal and record the data of each frequency, and then compare the voltage standing wave ratio (VSWR) of 6 points that require on each position, need the amplitude of each control signal generator all in same size, also need to be after signal stabilization, receiver reads all data under the reception value record of each frequency, then contrast each position ratio of the data of 6 points around, requirement can not surpass 6dB.
Preferably, test process is as follows:
Step 101, a point of a locus annex in corresponding anechoic chamber, place, is used the pectination signal being arranged in anechoic chamber, to occur 400 and generates fixed frequency, and the signal of fixed amplitude is delivered to emitting antenna 500 transmittings that are arranged in anechoic chamber.
Step 102, receives the electromagnetic wave of emitting antenna 500 transmittings by the receiving antenna 300 being arranged in anechoic chamber,, and is sent to prime amplifier 200.
Step 103, is sent to frequency spectrograph or receiver by prime amplifier 200 by described electromagnetic wave.
Step 104, receiver or frequency spectrograph are analyzed the electromagnetic wave that receiving antenna 300 receives, control receiving antenna lifting within the scope of 1 meter to 4 meters, read the maximum electromagnetic wave that receiving antenna 300 receives, and the storage of the current point (transmit direction of emitting antenna 400) of corresponding current locus.
Step 105, the next point of corresponding current locus, changes the transmit direction that receives emitting antenna 500, and repeating step 101, to step 104, if institute's step 101 of a little all having carried out of corresponding current locus is to 104, performs step 106.
Step 106, moves to the default locus of the next one in anechoic chamber, by receiving antenna 500 and pectination signal generator 400, and by a point of the corresponding current locus moving to of the transmit direction of emitting antenna 500, execution step 101 to 105.If step 101 has all been carried out to step 105 in all default locus in corresponding anechoic chamber,, perform step 107.
Step 107, the electromagnetic wave of locational 6 somes storage of each pre-set space of more corresponding anechoic chamber, field, obtains anechoic chamber, place voltage standing wave ratio (VSWR).
In above-mentioned test process, for step 101, use pectination signal generator 400 as emissive source, be connected with emitting antenna 500, pectination signal generator 400 is as a kind of stable signal generator that can launch a plurality of Frequency point signals simultaneously, transmit stable, can full frequency band simultaneously constant transmitted signal and each frequency signal amplitude fix.Without adjusting signal frequency and amplitude, can save a large amount of Measuring Time, reduce the service time of anechoic chamber,, and then reduce the use cost of anechoic chamber.
In addition, the ground connection flat board that pectination signal generator 400 can be put into anechoic chamber, is underground, but not anechoic chamber, outside, without from dull and stereotyped ground of the overhead ground connection of anechoic chamber, volume underpass, bracing wire, lead-in wire, to outdoor, can be saved a large amount of system configuration time, further reduces the use cost of anechoic chamber.Can use very short coaxial cable to connect pectination signal generator 400 and emitting antenna 500.The length of coaxial cable can be less than 3 meters.Can shorten greatly the distance of signal generator and emitting antenna, reduce coaxial cable signal attenuation, improve measuring accuracy.
For step 104, used frequency spectrograph or receiver to carry out data analysis, the equipment of the low and electromagnetic compatibility laboratory indispensability of the price of frequency spectrograph and receiver, is convenient to test system building.Can reduce greatly comparatively dependences of the signal handling equipment of accurate and expensive instrument such as network analyzers.
In addition, frequency spectrograph or receiver do not need synchronous conditioning signal, and it is the basic function of frequency spectrograph and receiver that maximal value keeps, without keeping long-time adjustment frequency spectrograph or receiver that its maximal value is kept and reading out data.Can further reduce operation complexity and improve testing efficiency.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (8)
1. a signal detection system that is applied to anechoic chamber,, it is characterized in that, comprise prime amplifier, signal processing apparatus, pectination signal generator, emitting antenna and receiving antenna, described pectination signal generator is connected with described emitting antenna, and described receiving antenna is connected with described signal processing apparatus by described prime amplifier.
2. the signal detection system that is applied to anechoic chamber, according to claim 1, is characterized in that, described signal processing device is set to frequency spectrograph.
3. the signal detection system that is applied to anechoic chamber, according to claim 1, is characterized in that, described signal processing device is set to receiver.
4. the signal detection system that is applied to anechoic chamber, according to claim 1, is characterized in that, described signal processing device is set to network analyzer.
5. the signal detection system that is applied to anechoic chamber, according to claim 1, it is characterized in that, described pectination signal generator comprises mu balanced circuit, crystal oscillating circuit, frequency division selection circuit, frequency division shaping circuit, step shaping circuit, balanced output circuit and the attenuator connecting successively.
6. according to the signal detection system that is applied to anechoic chamber, described in any one in claim 1 to 5, it is characterized in that, described pectination signal generator, described emitting antenna and described receiving antenna are arranged in anechoic chamber.
7. the signal detection system that is applied to anechoic chamber, according to claim 6, is characterized in that, described pectination signal generator is connected with described emitting antenna by coaxial cable.
8. the signal detection system that is applied to anechoic chamber, according to claim 7, is characterized in that, the length of described coaxial cable is less than or equal to 3 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420301801.7U CN203894401U (en) | 2014-06-06 | 2014-06-06 | Signal detection system applied to electric wave darkroom |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420301801.7U CN203894401U (en) | 2014-06-06 | 2014-06-06 | Signal detection system applied to electric wave darkroom |
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| CN203894401U true CN203894401U (en) | 2014-10-22 |
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| CN201420301801.7U Active CN203894401U (en) | 2014-06-06 | 2014-06-06 | Signal detection system applied to electric wave darkroom |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155959A (en) * | 2017-12-15 | 2018-06-12 | 成都爱科特科技发展有限公司 | UAV TT ＆ C's signal detecting method under a kind of complex network environment |
| CN113126035A (en) * | 2021-04-20 | 2021-07-16 | 核工业西南物理研究院 | Multichannel microwave detector based on comb spectrum frequency conversion |
-
2014
- 2014-06-06 CN CN201420301801.7U patent/CN203894401U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155959A (en) * | 2017-12-15 | 2018-06-12 | 成都爱科特科技发展有限公司 | UAV TT ＆ C's signal detecting method under a kind of complex network environment |
| CN113126035A (en) * | 2021-04-20 | 2021-07-16 | 核工业西南物理研究院 | Multichannel microwave detector based on comb spectrum frequency conversion |
| CN113126035B (en) * | 2021-04-20 | 2024-01-23 | 核工业西南物理研究院 | Multichannel microwave detector based on comb spectrum frequency conversion |
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Address after: 510656 Guangdong city of Guangzhou province Whampoa Avenue Tianhe District Xiping Yun Road No. 163 Patentee after: Radio and TV Measurement and Testing Group Co.,Ltd. Address before: 510656 Guangdong city of Guangzhou province Whampoa Avenue Tianhe District Xiping Yun Road No. 163 Patentee before: GUANGZHOU GRG METROLOGY & TEST Co.,Ltd. |