CN102868462A - Inter-modulation signal detecting system and method - Google Patents
Inter-modulation signal detecting system and method Download PDFInfo
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- CN102868462A CN102868462A CN2012103306363A CN201210330636A CN102868462A CN 102868462 A CN102868462 A CN 102868462A CN 2012103306363 A CN2012103306363 A CN 2012103306363A CN 201210330636 A CN201210330636 A CN 201210330636A CN 102868462 A CN102868462 A CN 102868462A
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Abstract
The invention provides an inter-modulation signal detecting system and method. The inter-modulation signal detecting system comprises a computer, at least two signal generators, at least two power amplifiers, a combiner, an automatic patting device and a spectrum analyzer. The at least two signal generators generate testing signals with at least two different frequencies under the control of the computer, and the at least two testing signals are respectively amplified by the at least two power amplifiers carry out power amplification on the testing signals. After the power amplification, the combiner combines the at least two testing signals into one combined signal and outputs the combined signal to the input end of a device to be tested. The combiner further receives an inter-modulation signal fed back by the device to be tested. The automatic patting device bears the device to be tested and can be used for patting the device to be tested at a pre-set acceleration. The spectrum analyzer is connected with the combiner and is used for extracting the inter-modulation signal and carrying out data analysis. In such a way, the detecting system can be used for testing the inter-modulation signal when the device to be tested receives vibration, so that the testing accuracy is improved.
Description
Technical field
The present invention relates to detection field, particularly relate to a kind of detection system and detection method thereof of inter-modulated signal.
Background technology
For the duplex signaling device, such as duplexer, filter, tower amplifier etc. needs its indices is tested before putting into the base station use.Along with development communication technologies is increasing to the quality requirement of signal transmission, it is particularly important that the test of inter-modulated signal seems.Third order intermodulation signal for example, when two CF signal are passed through a passive device, such as antenna, cable, filter or duplexer etc., select the reasons such as unreliable, the rosin joint of improper, Mechanical Contact or surface oxidation owing to its material, junction at different materials can produce non-linear factor, and this is just as mixer diode.Two CF signal (F1 and F2) and second harmonic (2F1 and 2F2) thereof the maximum intermodulation product that further produces be exactly the third order intermodulation signal (2F1-F2 and 2F2-F1) of distortion.The third order intermodulation signal of distortion can reduce the performance of communication system.Excessive third order intermodulation signal can disturb other receiver in transmitting, and finally causes receiver to work.
Present existing intermodulation testing device can provide the fundamental measurement of intermodulation index, simple intermodulation testing basic function namely only can be provided, can not contain or satisfy mechanical structure and stable manufacturing process property testing problem that modern duplex signaling device relates in the test process of inter-modulated signal.And a lot of links need artificial operation, control, observation in the process of whole product test checking, and not only testing efficiency is low, and causes easily artificial erroneous judgement to cause underproof product stream to go to applications client.
Summary of the invention
The technical problem that the present invention mainly solves provides a kind of detection system and detection method thereof of inter-modulated signal, carrying out the test of inter-modulated signal when device under test is accepted vibrations, to improve the accuracy of test.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of detection system of inter-modulated signal is provided, and this detection system comprises computer, at least two signal generators, at least two power amplifiers, mixer, automatic flapping device and spectrum analyzers.At least two signal generators are connected with computer respectively, and produce the test signal of at least two different frequencies under the control of computer.At least two power amplifiers respectively with at least two signal generators in a corresponding connection, carry out power amplification with the test signal of at least two different frequencies that at least two signal generators are produced.Mixer is connected with at least two power amplifiers, synthesize one road composite signal with the test signal with at least two different frequencies after the power amplification, and exporting the input of device under test to, mixer also receives the inter-modulated signal that device under test is fed back to by input.Automatic flapping device carrying device under test, and with predetermined acceleration beating device under test.Spectrum analyzer is connected with mixer, extracts inter-modulated signal and does data analysis.
Wherein, spectrum analyzer is connected with at least two signal generators, so that the inter-modulated signal that spectrum analyzer receives is synchronous on time and frequency with the test signal of at least two different frequencies of at least two signal generators generations.
Wherein, detection system further comprises direct current injector and DC power supply, and DC power supply is connected with the direct current injector, to provide direct current signal to the direct current injector; The direct current injector is connected between the input of mixer and device under test, and the direct current injector injects direct current signal in composite signal.
Wherein, detection system further comprises the acceleration metering device, be connected with computer, and for detection of the acceleration of automatic flapping device, and by the Computer display acceleration.
Wherein, detection system further comprises load, and load connects the output of device under test, is used for receiving and absorbing from the radiofrequency signal of output output.
Wherein, the automatic flapping device comprises pressure source, electromagnetically operated valve, cylinder and controller, and electromagnetically operated valve is connected between pressure source and the cylinder, and carries out the selectivity conducting under the control of controller, so that cylinder is patted action under the effect of pressure source.
Wherein, controller makes cylinder pat with different acceleration by the control electromagnetically operated valve.
For solving the problems of the technologies described above, another technical solution used in the present invention is: the detection method that a kind of inter-modulated signal is provided, the detection method of this inter-modulated signal comprises step: by the test signal of at least two different frequencies of at least two signal generators generations of computer control, and by the acceleration beating device under test of computer control automatic flapping device to be scheduled to; By at least two power amplifiers the test signal of at least two different frequencies is carried out power amplification; Test signal by at least two different frequencies of mixer after with power amplification synthesizes one road composite signal, and inputs to the input of device under test, and receives the inter-modulated signal that the input of device under test feeds back to; Extract inter-modulated signal and do data analysis by spectrum analyzer.
Wherein, test signal by at least two different frequencies of mixer after with power amplification synthesizes one road composite signal, and input to the input of device under test, and the step that receives the inter-modulated signal that the input of device under test feeds back to comprises: the test signal by at least two different frequencies of mixer after with power amplification synthesizes one road composite signal; In composite signal, inject direct current signal by the direct current injector; The composite signal that will inject direct current signal by the direct current injector inputs to the input of device under test; Receive the inter-modulated signal that the input of device under test feeds back to by mixer.
Wherein, detection method further comprises step: by accelerating whether the metering device sense acceleration is the acceleration of being scheduled to; If acceleration is not the deceleration of being scheduled to, then by computer the acceleration of automatic flapping device is adjusted into predetermined acceleration.
Wherein, in the test signal that is produced at least two different frequencies at least by two signal generators of computer control, and pat in the step of device under test with predetermined acceleration by computer control automatic flapping device, by the acceleration of computer control automatic flapping device with predetermined time change automatic flapping device, or the acceleration of change automatic flapping device during the frequency change of the test signal that produces at the computer control signal generator.
Wherein, this detection method further comprises step: by the radiofrequency signal that load receives and absorption is exported from output.
The invention has the beneficial effects as follows: the situation that is different from prior art, the detection system of inter-modulated signal of the present invention and detection method thereof are owing to pat device under test with predetermined acceleration, so that device under test can keep specific vibrations when test, thereby the test of inter-modulated signal can when accepting vibrations, device under test be carried out, to improve the accuracy of test.And, because the detection system of inter-modulated signal of the present invention has computer to control and observe fully, do not need too many manpower to operate, control, observe, thereby further improved efficient, flexibility ratio and the accuracy of test.
Description of drawings
Fig. 1 is the structural representation of detection system of the inter-modulated signal of first embodiment of the invention;
Fig. 2 is the structural representation of the automatic flapping device in the first embodiment of the invention;
Fig. 3 is the flow chart of detection method of the inter-modulated signal of second embodiment of the invention;
Fig. 4 is step S23 sub-process figure in a preferred embodiment in the detection method of inter-modulated signal of second embodiment of the invention.
Embodiment
See also Fig. 1, Fig. 1 is the structural representation of detection system of the inter-modulated signal of first embodiment of the invention.In the present embodiment, this detection system comprises computer 01, signal generator 02,03, power amplifier 04,05, mixer 06, spectrum analyzer 07, direct current injector 08, DC power supply 09, automatic flapping device 10, accelerates metering device 12 and load 13.
Direct current injector 08 is connected between the input of mixer 06 and device under test 11, and injects direct current signal in composite signal, and the composite signal that then will inject direct current signal is sent to the input of device under test 11.The Main Function of this direct current signal is to be device under test 11 power supplies.For example, if this device under test 11 is tower amplifier, then must be powered by direct current signal just can operate, and then tests.
In a preferred embodiment, automatic flapping device 10 is connected with computer 1, under the control of computer 1, signal generator 02,03 and automatic flapping device 10 cooperatively interact.Computer 1 control automatic flapping device 10 is with the acceleration of predetermined time change automatic flapping device 10.Perhaps, when the frequency change of computer 1 control signal generator 02,03 test signal that produces, the acceleration of change automatic flapping device 10.For example, computer control signal generator 02,03 sends signal A, B, controlling simultaneously automatic flapping device 10 pats, the speed of control cylinder 104 is V1, beating strength is N1, the speed of patting time T 1 rear change beating is that V2 and strength are N2, pats time T 2 rear continuation and changes, by that analogy.Perhaps, computer 1 control signal generator 02, the test of 03 different frequency, computer 1 sends signal A1, B1, controls simultaneously automatic flapping device 10 and pats, the speed of control cylinder 104 is V1, beating strength is N1, and after a period of time, signal A2, B2 are sent in computer 1 change, controlling simultaneously automatic flapping device 10 pats, the speed of control cylinder 104 is V2, and beating strength is N2, by that analogy.
Accelerate metering device 12 and be connected between automatic flapping device 10 and the computer 01, for detection of the acceleration of automatic flapping device 10, and auxiliary automatic flapping device 10 is calibrated its acceleration.After acceleration metering device 12 detects the acceleration of automatic flapping device 10, show this acceleration by computer 01, if this acceleration is not the acceleration of being scheduled to, then regulate automatic flapping device 10, make acceleration metering device 12 detected acceleration reach predetermined acceleration.Because acceleration metering device 12 is for before device under test 11 is tested automatic flapping device 10 being detected, therefore can omitting in other embodiments and accelerate metering device 12.
After device under test 11 receives composite signal by its input, can feed back to inter-modulated signal at input, inter-modulated signal is received by mixer 06.Wherein, inter-modulated signal is the third order intermodulation signal.In other embodiments, inter-modulated signal also can be fifth order intermodulation signal, seven rank inter-modulated signal or ten third order intermodulation signals.
In the above-described embodiments, power amplifier 04,05 is preferably high frequency power amplifier, mixer 06 is preferably low intermodulation mixer, direct current injector 08 is preferably low intermodulation direct current injector, automatic flapping device 10 is preferably automatic flapping device able to programme, and load 13 is preferably low intermodulation high power load.Device under test 11 is mainly the duplex signaling device, such as duplexer, filter, tower amplifier etc.
In other embodiments, according to concrete needs, signal generator 02,03 and power amplifier 04,05 can be a plurality ofly, and be not to be restricted to two.
See also Fig. 3, Fig. 3 is the flow chart of detection method of the inter-modulated signal of second embodiment of the invention.In the present embodiment, the detection method of inter-modulated signal comprises the following steps:
In step S21, by the test signal of at least two different frequencies of at least two signal generators generations of computer control, and by the acceleration beating device under test of computer control automatic flapping device to be scheduled to.In this step, by the acceleration of computer control automatic flapping device with predetermined time change automatic flapping device, or the acceleration of change automatic flapping device during the frequency change of the test signal that produces at the computer control signal generator.For example, the computer control signal generator sends signal A, B, controls simultaneously the automatic flapping device and pats, the speed of control cylinder is V1, and beating strength is N1, and the speed of patting time T 1 rear change beating is that V2 and strength are N2, the beating time is T2, by that analogy.Perhaps, computer sends signal A1, B1, control simultaneously the automatic flapping device and pat, the speed of control cylinder is V1, and beating strength is N1, after a period of time, signal A2, B2 are sent in the computer change, control simultaneously the automatic flapping device and pat, and the speed of control cylinder is V2, beating strength is N2, by that analogy.
In step S22, by at least two power amplifiers the test signal of at least two different frequencies is carried out power amplification.
In step S23, synthesize one road composite signal by the test signal of at least two different frequencies of mixer after with power amplification, and input to the input of device under test, and receive the inter-modulated signal that the input of device under test feeds back to.See also Fig. 4, Fig. 4 is step S23 sub-process figure in a preferred embodiment in the detection method of inter-modulated signal of second embodiment of the invention.In a preferred embodiment, step S23 comprises:
In step S231, synthesize one road composite signal by the test signal of at least two different frequencies of mixer after with power amplification.
In step S232, in composite signal, inject direct current signal by the direct current injector.The Main Function of this direct current signal is to be the device under test power supply.
In step S233, the composite signal that will inject direct current signal by the direct current injector inputs to the input of device under test.
In step S234, receive the inter-modulated signal that the input of device under test feeds back to by mixer.
In step S24, extract inter-modulated signal and do data analysis by spectrum analyzer.
In other embodiments, radiofrequency signal reflection and systems radiate for the effective attenuation device under test also further comprise step: by the radiofrequency signal that load receives and absorption is exported from the output of device under test.
By the way, the detection system of inter-modulated signal of the present invention and detection method thereof are owing to pat device under test with predetermined acceleration, so that device under test can keep specific vibrations when test, thereby the test of inter-modulated signal can when accepting vibrations, device under test be carried out, to improve the accuracy of test.And, because the detection system of inter-modulated signal of the present invention has computer to control and observe fully, do not need too many manpower to operate, control, observe, thereby further improved efficient, flexibility ratio and the accuracy of test.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (12)
1. the detection system of an inter-modulated signal is characterized in that, described detection system comprises:
Computer;
At least two signal generators are connected with described computer respectively, and produce the test signal of at least two different frequencies under the control of described computer;
At least two power amplifiers, respectively with described at least two signal generators in a corresponding connection, carry out power amplification with the test signal of described at least two different frequencies that described at least two signal generators are produced;
Mixer, be connected with described at least two power amplifiers, synthesize one road composite signal with the test signal with described at least two different frequencies after the power amplification, and exporting the input of device under test to, described mixer also receives the inter-modulated signal that described device under test is fed back to by described input;
The automatic flapping device carries described device under test, and pats described device under test with predetermined acceleration;
Spectrum analyzer is connected with described mixer, extracts described inter-modulated signal and does data analysis.
2. the detection system of inter-modulated signal according to claim 1, it is characterized in that, described spectrum analyzer is connected with described two signal generators at least, so that the test signal of described at least two different frequencies that the described inter-modulated signal that described spectrum analyzer receives and described at least two signal generators produce is synchronous on time and frequency.
3. the detection system of inter-modulated signal according to claim 1, it is characterized in that, described detection system further comprises direct current injector and DC power supply, and described DC power supply is connected with described direct current injector, to provide described direct current signal to described direct current injector; Described direct current injector is connected between the input of described mixer and described device under test, and described direct current injector injects direct current signal in described composite signal.
4. the detection system of inter-modulated signal according to claim 1, it is characterized in that described detection system further comprises the acceleration metering device, be connected with described computer, for detection of the acceleration of described automatic flapping device, and by the described acceleration of described Computer display.
5. the detection system of inter-modulated signal according to claim 1 is characterized in that, described detection system further comprises load, and described load connects the output of described device under test, is used for receiving and absorbing from the radiofrequency signal of described output output.
6. the detection system of inter-modulated signal according to claim 1, it is characterized in that, described automatic flapping device comprises pressure source, electromagnetically operated valve, cylinder and controller, described electromagnetically operated valve is connected between described pressure source and the described cylinder, and carry out the selectivity conducting under the control of described controller, so that described cylinder is patted action under the effect of described pressure source.
7. the detection system of inter-modulated signal according to claim 6 is characterized in that, described controller makes described cylinder pat with different acceleration by controlling described electromagnetically operated valve.
8. the detection method of an inter-modulated signal is characterized in that, described detection method comprises step:
By the test signal of at least two different frequencies of at least two signal generators generations of computer control, and by the acceleration beating device under test of described computer control automatic flapping device to be scheduled to;
By at least two power amplifiers the test signal of described at least two different frequencies is carried out power amplification;
Test signal by described at least two different frequencies of mixer after with power amplification synthesizes one road composite signal, and inputs to the input of described device under test, and receives the inter-modulated signal that the described input of described device under test feeds back to;
Extract described inter-modulated signal and do data analysis by spectrum analyzer.
9. the detection method of inter-modulated signal according to claim 8, it is characterized in that, test signal by described at least two different frequencies of mixer after with power amplification synthesizes one road composite signal, and input to the input of device under test, and the step that receives the inter-modulated signal that the described input of described device under test feeds back to comprises:
Test signal by described at least two different frequencies of described mixer after with power amplification synthesizes one road composite signal;
In described composite signal, inject direct current signal by the direct current injector;
The described composite signal that will inject described direct current signal by described direct current injector inputs to the described input of described device under test;
Receive the inter-modulated signal that the described input of described device under test feeds back to by described synthesizer.
10. the detection method of inter-modulated signal according to claim 8 is characterized in that, described detection method further comprises step:
Whether the described acceleration that is detected described automatic flapping device by the acceleration metering device is described predetermined acceleration;
If described acceleration is not described predetermined deceleration, then by computer the described acceleration of described automatic flapping device is adjusted into described predetermined acceleration.
11. the detection method of inter-modulated signal according to claim 8, it is characterized in that, in the described test signal that is produced at least two different frequencies at least by two signal generators of computer control, and pat in the step of device under test with predetermined acceleration by described computer control automatic flapping device, change the acceleration of described automatic flapping device by described computer control automatic flapping device with predetermined time, or change the acceleration of described automatic flapping device during the frequency change of the test signal that produces at the described signal generator of described computer control.
12. the detection method of inter-modulated signal according to claim 8 is characterized in that, described detection method further comprises step:
By the radiofrequency signal that load receives and absorption is exported from described output.
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| CN103995192A (en) * | 2014-04-29 | 2014-08-20 | 中国人民解放军装备学院 | Method and equipment for testing and evaluating electromagnetic environment adaptability of electronic equipment |
| WO2017101601A1 (en) * | 2015-12-15 | 2017-06-22 | 中兴通讯股份有限公司 | Method, system and base station for detecting mutual interference in co-antenna feeding combiner |
| CN108152778A (en) * | 2018-01-29 | 2018-06-12 | 昆山立讯射频科技有限公司 | The automatic intermodulation testing equipment of wave filter |
| CN114095932A (en) * | 2021-11-17 | 2022-02-25 | 重庆兰空无人机技术有限公司 | Method and system for frequency spectrum detection and unmanned aerial vehicle positioning equipment |
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Application publication date: 20130109 |