CN202503522U - Super heterodyne harmonic detection device - Google Patents
Super heterodyne harmonic detection device Download PDFInfo
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- CN202503522U CN202503522U CN2012200134854U CN201220013485U CN202503522U CN 202503522 U CN202503522 U CN 202503522U CN 2012200134854 U CN2012200134854 U CN 2012200134854U CN 201220013485 U CN201220013485 U CN 201220013485U CN 202503522 U CN202503522 U CN 202503522U
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Abstract
The utility model relates to a super heterodyne harmonic detection device including a radio frequency channel selecting unit (1) and an intermediate frequency signal generation and processing unit (2). An input terminal of the intermediate frequency signal generation and processing unit (2) is connected with an output terminal of the radio frequency channel selection unit (1). Compared with the prior art, the utility model has the advantages of simple structure, high sensitivity, low power consumption, low cost, good extensibility.
Description
Technical field
The utility model relates to a kind of harmonic wave checkout equipment, especially relates to a kind of superhet harmonic wave checkout equipment.
Background technology
At radio frequency, wireless communication field, transmission of Information all is information to be modulated on the carrier wave of upper frequency carry out, and therefore the carrier wave measurement to radiofrequency signal seems particularly important.Simultaneously, be subject to the non-renewable of frequency resource, the harmonic components of carrier wave is also had various mandatory specification and requirement.The existence of harmonic wave is a presentation of carrier signal distortion, and simultaneously harmonic frequency also possibly produce fatal interference to other frequency, and is therefore also extremely important and be absolutely necessary to the harmonic measure of these carrier signals.In above-mentioned measurement requirement, the measuring frequency scope has surpassed one even two octaves usually.Such as, the signal of measurement 900MHz, its triple-frequency harmonics is near 2700MHz.In the face of this measurement requirement, the most frequently used method is to adopt the wide-band microwave spectrum analyzer directly to measure, and it can disposablely directly be measured first-harmonic, second harmonic, triple-frequency harmonics come out, and uses also very convenient.A kind of in addition method is to use oscilloscope that signal is measured, and is transformed into frequency-region signal analysis through fft algorithm then.These two kinds of methods all have use, but also have the following problem simultaneously:
1) the measuring frequency scope of wide band radio-frequency microwave spectrometer is very wide, covering frequence from low frequency to tens 6Hz.Under this application scenario, a large amount of frequency resources are wasted.This measurement mostly adopts multistage frequency conversion to realize, such as three grades of frequency conversions or secondary frequency conversion etc.Along with the increase of frequency conversion progression, system noise factor increases, and it is low to have influenced systematic survey sensitivity.
2) adopt spectrum analyzer to carry out the technical system complicacy of harmonic measure, volume is big, and Heavy Weight is unfavorable for the integrated processing of module.The cost that utilizes frequency spectrograph directly to measure is very high, and the sexual valence ratio is very uneconomical in industrial test is used.
3) oscilloscope measurement is subject to the bandwidth chahnel and the sample rate influence of instrument, and upper frequency limit is difficult to reach very high frequency.Simultaneously, oscillographic dynamic range is very little, and is just powerless to less harmonic measure.
The utility model content
The purpose of the utility model be exactly provide in order to overcome the defective that above-mentioned prior art exists a kind of simple in structure, highly sensitive, power consumption is little, cost is low, the superhet harmonic wave checkout equipment of favorable expandability.
The purpose of the utility model can realize through following technical scheme:
A kind of superhet harmonic wave checkout equipment is characterized in that, comprises that radio-frequency channel selected cell and intermediate-freuqncy signal generate and processing unit, and described intermediate-freuqncy signal generates and the input of processing unit is connected with the output of radio-frequency channel selected cell;
Described radio-frequency channel selected cell filters the back with radio-frequency input signals and generates required preliminary election radiofrequency signal; This preliminary election radiofrequency signal is sent to intermediate-freuqncy signal and generates and processing unit; Intermediate-freuqncy signal generation and processing unit are transformed into the preliminary election radiofrequency signal that receives the analog intermediate frequency signal of fixed frequency; And successively this analog intermediate frequency signal is carried out converting digital intermediate frequency signal to after filtering, amplification, the analog to digital conversion processing, this digital intermediate frequency signal is carried out filtering, bandwidth shaping and detection successively handle back output The ultimate results signal.
Described radio-frequency channel selected cell comprises first-harmonic filter, second harmonic filter, triple frequency harmonic filter, first switch and second switch; Described first switch is connected with the input of first-harmonic filter, the input of second harmonic filter and the input of triple frequency harmonic filter respectively, and described second switch is connected with the output of first-harmonic filter, the output of second harmonic filter and the output of triple frequency harmonic filter respectively;
Described first switch is sent radio-frequency input signals into these three radio-frequency channels of first-harmonic passage, second harmonic passage and triple-frequency harmonics passage respectively; Each passage carries out filtering by first-harmonic filter, second harmonic filter and triple frequency harmonic filter to the radiofrequency signal that gets into this passage respectively; Generate required preliminary election radiofrequency signal, this preliminary election radiofrequency signal gets into intermediate-freuqncy signal through second switch and generates and processing unit.
Described intermediate-freuqncy signal generates and processing unit comprises local vibration source, frequency mixer, intermediate-frequency filter, intermediate frequency amplifier, A-D converter, digital down converter and synchronous circuit; Described local vibration source, frequency mixer, intermediate-frequency filter, intermediate frequency amplifier, A-D converter and digital down converter are connected successively; Described synchronous circuit is arranged between local vibration source and the digital down converter, the input of described frequency mixer respectively with the radio-frequency channel selected cell in output, the output of second harmonic filter and the output of triple frequency harmonic filter of first-harmonic filter be connected;
Described frequency mixer produces the local frequency mixing of preliminary election radio frequency signal frequency that receives and local vibration source output the analog intermediate frequency signal of a fixed-frequency; This analog intermediate frequency signal gets into digital down converter successively after intermediate-frequency filter, intermediate frequency amplifier and A-D converter convert digital intermediate frequency signal to, filtering, bandwidth shaping and detection etc. that this digital down converter is accomplished digital intermediate frequency signal are handled and output The ultimate results signal.
Described digital down converter (25) is realized through FPGA.
Compared with prior art, the utlity model has following advantage:
1) this device structure is simple, and inner each function all is narrow band circuit, is easy to realize;
2) can measure the frequency and the range value of carrier wave, second harmonic, triple-frequency harmonics, and not need broadband scanning;
3) adopt a mixing can realize measuring, system noise factor is less, measures sensitivity and improves greatly;
4) entire equipment volume and power consumption are little, are easy to the system integration;
5) realize that cost reduces greatly;
6), can change relative filter and local vibration source and can realize that the scalability of module is good to the measurement of different frequency.
Description of drawings
Fig. 1 is the structural representation of this harmonic wave checkout equipment;
Fig. 2 is the structural representation of digital down converter;
Fig. 3 is the flow chart of radio-frequency signal detection.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
As shown in Figure 1, this harmonic wave checkout equipment comprises that radio-frequency channel selected cell 1 and intermediate-freuqncy signal generate and processing unit 2 two parts, and wherein, intermediate-freuqncy signal generates and the input of processing unit 2 is connected with the output of radio-frequency channel selected cell 1.The operation principle of this device is following: the preliminary election radiofrequency signal that the radio-frequency input signals that need detect needs through 1 generation of radio-frequency channel selected cell; This preliminary election radiofrequency signal is sent to intermediate-freuqncy signal immediately and generates and processing unit 2; Intermediate-freuqncy signal generation and processing unit 2 are transformed into the preliminary election radiofrequency signal that receives the analog intermediate frequency signal of fixed frequency; And successively this analog intermediate frequency signal is carried out converting digital intermediate frequency signal to after filtering, amplification, the analog to digital conversion processing; This digital intermediate frequency signal is carried out filtering, bandwidth shaping and detection successively handle back output The ultimate results signal, concrete signal processing flow is as shown in Figure 3.
Fig. 1 provides the concrete structure of radio-frequency channel selected cell 1; This unit comprises first-harmonic filter 11, second harmonic filter 12, triple frequency harmonic filter 13, first switch 14 and second switch 15; Wherein, First switch 14 is connected with the input of first-harmonic filter 11, the input of second harmonic filter 12 and the input of triple frequency harmonic filter 13 respectively, and second switch 15 is connected with the output of first-harmonic filter 11, the output of second harmonic filter 12 and the output of triple frequency harmonic filter 13 respectively.
The operation principle of this unit is following: radio-frequency input signals gets into these three radio-frequency channels of first-harmonic passage, second harmonic passage and triple-frequency harmonics passage respectively through first switch 14; Each passage carries out filtering by first-harmonic filter 11, second harmonic filter 12 and 13 pairs of radiofrequency signals that get into this passage of triple frequency harmonic filter respectively; Generate required preliminary election radiofrequency signal, this preliminary election radiofrequency signal gets into intermediate-freuqncy signal through second switch 15 and generates and processing unit 2.
Fig. 1 also provides the concrete structure of intermediate-freuqncy signal generation and processing unit 2; This unit comprises local vibration source 26, frequency mixer 21, intermediate-frequency filter 22, intermediate frequency amplifier 23, A-D converter 24, digital down converter 25 and synchronous circuit 27; Wherein, Local vibration source 26, frequency mixer 21, intermediate-frequency filter 22, intermediate frequency amplifier 23, A-D converter 24 and digital down converter 25 are connected successively; Synchronous circuit 27 is arranged between local vibration source 26 and the digital down converter 25; Be used for synchronous local oscillation signal and measurement signals, the input of frequency mixer 21 respectively with radio-frequency channel selected cell 1 in output, the output of second harmonic filter 12 and the output of triple frequency harmonic filter 13 of first-harmonic filter 11 be connected.
The operation principle of this unit is following: frequency mixer 21 produces the local frequency mixing of preliminary election radio frequency signal frequency that receives and local vibration source 26 outputs the analog intermediate frequency signal of a fixed-frequency; The fixed-frequency of this analog intermediate frequency signal; 22 pairs of these analog intermediate frequency signals of intermediate-frequency filter carry out Filtering Processing; Filtering local oscillation signal, original radio-frequency input signals and relevant spurious signal are also delivered to intermediate frequency amplifier 23 with it and are carried out signal gain; The size of gain is according to the size decision of analog intermediate frequency signal amplitude; To adapt to the measurement requirement of unlike signal amplitude, the analog intermediate frequency signal after A-D converter 24 will filter, gain carries out analog-to-digital conversion, converts to and gets into digital down converter 25 behind the digital intermediate frequency signal; Filtering, bandwidth shaping and the detection etc. of digital intermediate frequency signal are handled in these digital down converter 25 completion and through interfaces such as USB, LAN and dedicated bus output The ultimate results signals, the function of digital down converter 25 realizes in FPGA.
Frequency range selection that it should be noted that local vibration source 26 is closely related with the frequency range of radio-frequency input signals, supposes the following f of being limited to of radio-frequency input signals frequency
In_min, on be limited to f
In_max, the frequency of intermediate-freuqncy signal is f
IF, when first-harmonic was measured so, the scope of the corresponding operating frequency f of local vibration source was [f
In_min+ f
IF, f
In_max+ f
IF]; When second harmonic was measured, the scope of the corresponding operating frequency f of local vibration source was [2 (2f
In_min+ f
IF), 2 (2f
In_max+ f
IF)]; When triple-frequency harmonics was measured, the scope of the corresponding operating frequency f of local vibration source was [3 (3f
In_min+ f
IF), 3 (3f
In_max+ f
IF)], when circuit was adjusted, local frequency can be calculated according to above-mentioned expression formula.
As shown in Figure 2, digital down converter 25 comprises first cic filter 251, second cic filter 252, first half-band filter 253, second half-band filter 254, a FIR filter 255, the 2nd FIR filter 256, mixer 257, filter 258, memory 259, digital oscillator 260 and 90-degree phase shifter 261.Wherein, First cic filter 251, first half-band filter 253 link to each other with a FIR filter 255 successively; Second cic filter 252, second half-band filter 254 link to each other with the 2nd FIR filter 256 successively; Mixer 257, filter 258 and memory 259 link to each other successively, and the input of mixer 257 links to each other with the output of a FIR filter 255, the output of the 2nd FIR filter 256 respectively, and the output of digital oscillator 260 links to each other with the input of 90-degree phase shifter 261.
The operation principle of this frequency converter is following: at first produce the two-way orthogonal signalling by digital oscillator 260 and 90-degree phase shifter 261; The digital intermediate frequency signal mixing that these two-way orthogonal signalling receive with frequency converter respectively produces the I road and the Q road two paths of signals of quadrature; And unwanted frequency component in the signal of I road is carried out algorithm by first cic filter 251; Too fast for prevent that I road signal from declining in first cic filter 251; Compensate by first half-band filter 253, the FIR filter I road signal after to decay; In like manner; Q road signal also carries out same treatment through second cic filter 252, second half-band filter 254 and the 2nd FIR filter 256 successively, and finally I road and the Q road two-way orthogonal signalling through compensation tache generate required baseband signal after mixer 257 closes the road, and this baseband signal stores memory into after wave filter 258 filtering medium to be sent.
The idiographic flow that Fig. 3 provides harmonic wave to detect, step is following:
At step S301, flow process begins;
At step S302, radio-frequency input signals admission passage selected cell 1;
At step S303, according to the detection needs, first switch 14 is sent radio-frequency input signals into relevant radio-frequency channel;
At step S304, respective filter carries out sending into IF processing unit 2 through second switch 15 after the filtering to radio-frequency input signals;
At step S305, frequency mixer 21 mixes the analog intermediate frequency signal that produces suitable processing with filtered radio-frequency input signals frequency with the local oscillation signal frequency of local vibration source 26 outputs;
At step S306,22 pairs of analog intermediate frequency signals of intermediate-frequency filter are selected, other spurious signal that filtering radio-frequency input signals and local oscillation signal and mixing produce;
At step S307,23 pairs of filtered analog intermediate frequency signals of intermediate frequency amplifier amplify;
At step S308, the analog intermediate frequency signal after A-D converter 24 will amplify is transformed into digital intermediate frequency signal;
At step S309,25 pairs of digital intermediate frequency signals of digital down converter carry out filtering, and processing such as bandwidth shaping and detection convert digital signal to baseband signal;
At step S310, IF processing unit 2 output The ultimate results signals;
At step S311, flow process finishes.
Claims (3)
1. superhet harmonic wave checkout equipment; It is characterized in that; Comprise that radio-frequency channel selected cell (1) and intermediate-freuqncy signal generate and processing unit (2), described intermediate-freuqncy signal generates and the input of processing unit (2) is connected with the output of radio-frequency channel selected cell (1).
2. a kind of superhet harmonic wave checkout equipment according to claim 1; It is characterized in that; Described radio-frequency channel selected cell (1) comprises first-harmonic filter (11), second harmonic filter (12), triple frequency harmonic filter (13), first switch (14) and second switch (15); Described first switch (14) is connected with the input of first-harmonic filter (11), the input of second harmonic filter (12) and the input of triple frequency harmonic filter (13) respectively, and described second switch (15) is connected with the output of first-harmonic filter (11), the output of second harmonic filter (12) and the output of triple frequency harmonic filter (13) respectively.
3. a kind of superhet harmonic wave checkout equipment according to claim 2; It is characterized in that; Described intermediate-freuqncy signal generates and processing unit (2) comprises local vibration source (26), frequency mixer (21), intermediate-frequency filter (22), intermediate frequency amplifier (23), A-D converter (24), digital down converter (25) and synchronous circuit (27); Described local vibration source (26), frequency mixer (21), intermediate-frequency filter (22), intermediate frequency amplifier (23), A-D converter (24) and digital down converter (25) are connected successively; Described synchronous circuit (27) is arranged between local vibration source (26) and the digital down converter (25), the input of described frequency mixer (21) respectively with radio-frequency channel selected cell (1) in output, the output of second harmonic filter (12) and the output of triple frequency harmonic filter (13) of first-harmonic filter (11) be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200134854U CN202503522U (en) | 2012-01-13 | 2012-01-13 | Super heterodyne harmonic detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200134854U CN202503522U (en) | 2012-01-13 | 2012-01-13 | Super heterodyne harmonic detection device |
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| Publication Number | Publication Date |
|---|---|
| CN202503522U true CN202503522U (en) | 2012-10-24 |
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| CN2012200134854U Expired - Lifetime CN202503522U (en) | 2012-01-13 | 2012-01-13 | Super heterodyne harmonic detection device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248444A (en) * | 2013-05-16 | 2013-08-14 | 中国电子科技集团公司第四十一研究所 | System integration device and system integration method for test parameters based on unit combination |
| CN103809024A (en) * | 2012-11-09 | 2014-05-21 | 江苏绿扬电子仪器集团有限公司 | FPGA-based real-time spectral analysis system |
| CN105049138A (en) * | 2015-08-10 | 2015-11-11 | 中国电子科技集团公司第四十一研究所 | Simple test device and method for harmonic wave network parameters |
| CN105842669A (en) * | 2016-03-29 | 2016-08-10 | 智举电子科技（上海）有限公司 | K-band radar testing system |
| CN106405235A (en) * | 2016-10-17 | 2017-02-15 | 深圳市鼎阳科技有限公司 | Spectrum analyzer and data processing method thereof |
| CN113075450A (en) * | 2021-02-22 | 2021-07-06 | 中国电子科技集团公司第二十九研究所 | Method for analyzing radio frequency and intermediate frequency of broadband frequency compressed signal based on sampling rate |
-
2012
- 2012-01-13 CN CN2012200134854U patent/CN202503522U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809024A (en) * | 2012-11-09 | 2014-05-21 | 江苏绿扬电子仪器集团有限公司 | FPGA-based real-time spectral analysis system |
| CN103248444A (en) * | 2013-05-16 | 2013-08-14 | 中国电子科技集团公司第四十一研究所 | System integration device and system integration method for test parameters based on unit combination |
| CN105049138A (en) * | 2015-08-10 | 2015-11-11 | 中国电子科技集团公司第四十一研究所 | Simple test device and method for harmonic wave network parameters |
| CN105842669A (en) * | 2016-03-29 | 2016-08-10 | 智举电子科技（上海）有限公司 | K-band radar testing system |
| CN106405235A (en) * | 2016-10-17 | 2017-02-15 | 深圳市鼎阳科技有限公司 | Spectrum analyzer and data processing method thereof |
| CN106405235B (en) * | 2016-10-17 | 2019-09-10 | 深圳市鼎阳科技有限公司 | A kind of spectrum analyzer and its data processing method |
| CN113075450A (en) * | 2021-02-22 | 2021-07-06 | 中国电子科技集团公司第二十九研究所 | Method for analyzing radio frequency and intermediate frequency of broadband frequency compressed signal based on sampling rate |
| CN113075450B (en) * | 2021-02-22 | 2023-04-25 | 中国电子科技集团公司第二十九研究所 | Method for analyzing radio frequency and intermediate frequency of broadband frequency compressed signal based on sampling rate |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20121024 |