CN104283625A - Superheterodyne harmonic detector based on harmonic mixing - Google Patents
Superheterodyne harmonic detector based on harmonic mixing Download PDFInfo
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- CN104283625A CN104283625A CN201210009142.5A CN201210009142A CN104283625A CN 104283625 A CN104283625 A CN 104283625A CN 201210009142 A CN201210009142 A CN 201210009142A CN 104283625 A CN104283625 A CN 104283625A
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Abstract
The invention relates to a superheterodyne harmonic detector based on harmonic mixing, which comprises an RF channel selecting unit (1) and an intermediate-frequency signal generating and processing unit (2). The input end of the intermediate-frequency signal generating and processing unit (2) is connected with the output end of the RF channel selecting unit (1). After the RF channel selecting unit (1) filters an RF input signal, a required pre-selected RF signal is generated. The pre-selected RF signal is transmitted to the intermediate-frequency signal generating and processing unit (2). The intermediate-frequency signal generating and processing unit (2) converts the received pre-selected RF signal to an intermediate-frequency analog signal with a fixed frequency, and successively performs filtering, amplifying and analog-to-digital converting on the intermediate-frequency analog signal for converting the intermediate-frequency analog signal to an intermediate-frequency digital signal. After intermediate-frequency digital signal is processed, a final measurement result signal is output. Compared with the prior art, the superheterodyne harmonic detector has advantages of simple structure, high sensitivity, low power consumption, low cost, high expandability, etc.
Description
Technical field
The present invention relates to a kind of harmonic measurement device, especially relate to a kind of superhet harmonic measurement device based on harmonic mixing.
Background technology
At radio frequency, wireless communication field, the transmission of information is all undertaken on modulates information to the carrier wave of upper frequency, and therefore the carrier wave measurement of radio frequency signal seems particularly important.Meanwhile, be limited to the non-renewable of frequency resource, also have various mandatory specification and requirement to the harmonic components of carrier wave.The existence of harmonic wave is a presentation of carrier signal distortion, and simultaneously harmonic frequency also may produce fatal interference to other frequency, therefore also extremely important and be absolutely necessary to the harmonic measure of these carrier signals.In above-mentioned measurement requires, measuring frequency scope has exceeded even two octaves usually.Such as, measure the signal of 900MHz, its triple-frequency harmonics is near 2700MHz.In the face of this measurement requirement, the most frequently used method adopts wide-band microwave spectrum analyzer directly to measure, and first-harmonic, second harmonic, triple-frequency harmonics can disposablely directly be measured by it, use also very convenient.Another method uses oscilloscope to measure signal, is then transformed into frequency-region signal analysis by fft algorithm.These two kinds of methods have use, but also there is the following problem simultaneously:
1) the measuring frequency scope of wide band radio-frequency microwave spectrometer is very wide, and covering frequence is from low frequency to tens GHz.Under this application scenario, a large amount of frequency resources is 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 have impact on systematic survey sensitivity low.
2) adopt spectrum analyzer to carry out the technical system complexity of harmonic measure, volume is large, and Heavy Weight, is unfavorable for module integration process.The cost utilizing frequency spectrograph directly to measure is very high, sexual valence ratio, very uneconomical in industrial test application.
3) oscilloscope measurement is limited to bandwidth chahnel and the sample rate impact of instrument, and upper frequency limit is difficult to reach very high frequency.Meanwhile, oscillographic dynamic range is very little, just helpless to less harmonic measure.
Summary of the invention
Object of the present invention is exactly provide that a kind of structure is simple, highly sensitive, power consumption is little, cost is low, the superhet harmonic measurement device based on harmonic mixing of favorable expandability to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of superhet harmonic measurement device based on harmonic mixing, it is characterized in that, comprise radio-frequency channel selected cell and intermediate-freuqncy signal to generate and processing unit, described intermediate-freuqncy signal generates and the input of processing unit is connected with the output of radio-frequency channel selected cell;
Preselected radio frequency signal needed for described radio-frequency channel selected cell generates after being filtered by radio-frequency input signals, this preselected radio frequency signal is sent to intermediate-freuqncy signal and generates and processing unit, intermediate-freuqncy signal generates and the preselected radio frequency signal received is transformed into the analog intermediate frequency signal of fixed frequency by processing unit, and convert digital intermediate frequency signal to after successively filtering, amplification, analog to digital conversion process being carried out to this analog intermediate frequency signal, export final measurement signals after filtering, bandwidth shaping and detection process are carried out successively to this digital intermediate frequency signal.
Described radio-frequency channel selected cell comprises first-harmonic filter, second harmonic filter, triple frequency harmonic filter, the first switch and second switch, the first described 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;
Radio-frequency input signals is sent into these three radio-frequency channels of first-harmonic passage, second harmonic passage and triple-frequency harmonics passage by the first described switch respectively, each passage carries out filtering by first-harmonic filter, second harmonic filter and triple frequency harmonic filter to the radiofrequency signal entering this passage respectively, preselected radio frequency signal needed for generation, this preselected radio frequency signal enters 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 is connected successively with digital down converter, described synchronous circuit is arranged between local vibration source and digital down converter, the input of described frequency mixer respectively with the output of the first-harmonic filter in the selected cell of radio-frequency channel, the output of second harmonic filter is connected with the output of triple frequency harmonic filter,
The local frequency mixing that the preselected radio frequency signal frequency received and local vibration source export is produced the fixing analog intermediate frequency signal of a frequency by described frequency mixer, this analog intermediate frequency signal converts to after digital intermediate frequency signal through intermediate-frequency filter, intermediate frequency amplifier and A-D converter successively and enters digital down converter, and this digital down converter completes filtering to digital intermediate frequency signal, bandwidth is shaped and detection etc. processes and export final measurement signals.
Described digital down converter (25) is realized by FPGA.
Compared with prior art, the present invention has the following advantages:
1) this apparatus structure is simple, and inner each function is all narrow band circuit, is easy to realize;
2) carrier wave, second harmonic, the frequency of triple-frequency harmonics and range value can be measured, and do not need broadband scanning;
3) adopt a mixing can realize measuring, system noise factor is less, and measurement sensistivity improves greatly;
4) whole device volume and power consumption little, be easy to the system integration;
5) realize cost greatly to reduce;
6) to the measurement of different frequency, can change relative filter and local vibration source can realize, the scalability of module is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of this harmonic measurement device;
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 the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, this harmonic measurement device comprises radio-frequency channel selected cell 1 and intermediate-freuqncy signal generates 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 as follows: need the radio-frequency input signals carrying out detecting to be generated the preselected radio frequency signal needed by radio-frequency channel selected cell 1, this preselected radio frequency signal is sent to intermediate-freuqncy signal immediately and generates and processing unit 2, intermediate-freuqncy signal generates and the preselected radio frequency signal received is transformed into the analog intermediate frequency signal of fixed frequency by processing unit 2, and successively filtering is carried out to this analog intermediate frequency signal, amplify, digital intermediate frequency signal is converted to after analog to digital conversion process, successively filtering is carried out to this digital intermediate frequency signal, bandwidth is shaped and exports final measurement signals after detection process, concrete signal processing flow 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 the input of first-harmonic filter 11, the input of second harmonic filter 12 and triple frequency harmonic filter 13 respectively, and second switch 15 is connected with the output of the output of first-harmonic filter 11, the output of second harmonic filter 12 and triple frequency harmonic filter 13 respectively.
The operation principle of this unit is as follows: radio-frequency input signals enters these three radio-frequency channels of first-harmonic passage, second harmonic passage and triple-frequency harmonics passage respectively by the first switch 14, each passage carries out filtering by first-harmonic filter 11, second harmonic filter 12 and triple frequency harmonic filter 13 to the radiofrequency signal entering this passage respectively, preselected radio frequency signal needed for generation, this preselected radio frequency signal enters intermediate-freuqncy signal through second switch 15 and generates and processing unit 2.
Fig. 1 additionally 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 is connected successively with digital down converter 25, synchronous circuit 27 is arranged between local vibration source 26 and digital down converter 25, for synchronous local oscillation signal and measurement signals, the input of frequency mixer 21 respectively with the output of the first-harmonic filter 11 in radio-frequency channel selected cell 1, the output of second harmonic filter 12 is connected with the output of triple frequency harmonic filter 13.
The operation principle of this unit is as follows: the local frequency mixing that the preselected radio frequency signal frequency received and local vibration source 26 export is produced the fixing analog intermediate frequency signal of a frequency by frequency mixer 21, the frequency of this analog intermediate frequency signal is fixed, intermediate-frequency filter 22 carries out filtering process to this analog intermediate frequency signal, filtering local oscillation signal, original radio-frequency input signals and relevant spurious signal are also delivered to intermediate frequency amplifier 23 and are carried out signal gain, the size of gain determines according to the size of analog intermediate frequency signal amplitude, to adapt to the measurement requirement of unlike signal amplitude, A-D converter 24 will filter, analog intermediate frequency signal after gain carries out analog-to-digital conversion, digital down converter 25 is entered after converting digital intermediate frequency signal to, this digital down converter 25 completes the filtering to digital intermediate frequency signal, bandwidth shaping and detection etc. process and pass through USB, the interface such as LAN and dedicated bus exports final measurement signals, the function of digital down converter 25 realizes in FPGA.
It should be noted that the frequency range of local vibration source 26 is selected with the frequency range of radio-frequency input signals closely related, suppose that the lower limit of radio-frequency input signals frequency is f
in_min, the upper limit is f
in_max, the frequency of intermediate-freuqncy signal is f
iF, when so first-harmonic is measured, the scope of the corresponding operating frequency f of local vibration source is [f
in_min+ f
iF, f
in_max+ f
iF]; When second harmonic is measured, the scope of the corresponding operating frequency f of local vibration source is [2 (2f
in_min+ f
iF), 2 (2f
in_max+ f
iF)]; When triple-frequency harmonics is measured, the scope of the corresponding operating frequency f of local vibration source is [3 (3f
in_min+ f
iF), 3 (3f
in_max+ f
iF)], when the regulation of electrical circuit, local frequency can calculate according to above-mentioned expression formula.
As shown in Figure 2, digital down converter 25 comprises the first cic filter 251, second cic filter 252, first half-band filter 253, second half-band filter 254, first FIR filter 255, second 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 is connected successively with the first FIR filter 255, second cic filter 252, second half-band filter 254 is connected successively with the second FIR filter 256, mixer 257, filter 258 are connected successively with memory 259, the input of mixer 257 is connected with the output of the first FIR filter 255, the output of the second FIR filter 256 respectively, and the output of digital oscillator 260 is connected with the input of 90-degree phase shifter 261.
The operation principle of this frequency converter is as follows: first produce 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 orthogonal I road and Q road two paths of signals, and by the first cic filter 251, unwanted frequency component in the signal of I road is carried out algorithm, too fast for preventing I road signal from declining in the first cic filter 251, by the first half-band filter 253, first FIR filter compensates the I road signal after decay, in like manner, Q road signal is also successively through the second cic filter 252, second half-band filter 254 and the second FIR filter 256 carry out same treatment, the I road and the Q road two-way orthogonal signalling that eventually pass through compensation tache generate required baseband signal after mixer 257 carries out closing road, it is medium to be sent that this baseband signal is stored into memory after device 258 filtering after filtering.
Fig. 3 provides the idiographic flow of harmonic detecting, and step is as follows:
In step S301, flow process starts;
In step S302, radio-frequency input signals admission passage selected cell 1;
In step S303, according to detection needs, radio-frequency input signals is sent into associated radio frequency passage by the first switch 14;
In step S304, after respective filter radio frequency input signal carries out filtering, send into IF processing unit 2 by second switch 15;
In step S305, the local oscillation signal frequency that filtered radio-frequency input signals frequency and local vibration source 26 export is carried out mixing the analog intermediate frequency signal producing and be applicable to processing by frequency mixer 21;
In step S306, intermediate-frequency filter 22 pairs of analog intermediate frequency signals are selected, other spurious signal of filtering radio-frequency input signals and local oscillation signal and mixing generation;
In step S307, intermediate frequency amplifier 23 amplifies filtered analog intermediate frequency signal;
In step S308, the analog intermediate frequency signal after amplification is transformed into digital intermediate frequency signal by A-D converter 24;
In step S309, digital down converter 25 pairs of digital intermediate frequency signals carry out filtering, and the process such as bandwidth shaping and detection, convert baseband signal to by digital signal;
In step S310, IF processing unit 2 exports final measurement signals;
In step S311, flow process terminates.
Claims (4)
1. the superhet harmonic measurement device based on harmonic mixing, it is characterized in that, comprise radio-frequency channel selected cell (1) and intermediate-freuqncy signal to 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);
Preselected radio frequency signal needed for described radio-frequency channel selected cell (1) generates after being filtered by radio-frequency input signals, this preselected radio frequency signal is sent to intermediate-freuqncy signal and generates and processing unit (2), intermediate-freuqncy signal generates and the preselected radio frequency signal received is transformed into the analog intermediate frequency signal of fixed frequency by processing unit (2), and successively filtering is carried out to this analog intermediate frequency signal, amplify, digital intermediate frequency signal is converted to after analog to digital conversion process, successively filtering is carried out to this digital medium-frequency signal, bandwidth is shaped and exports final measurement signals after detection process.
2. a kind of superhet harmonic measurement device based on harmonic mixing 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 the first switch (14) respectively with the input of first-harmonic filter (11), the input of second harmonic filter (12) is connected with the input of triple frequency harmonic filter (13), described second switch (15) respectively with the output of first-harmonic filter (11), the output of second harmonic filter (12) is connected with the output of triple frequency harmonic filter (13),
Radio-frequency input signals is sent into these three radio-frequency channels of first-harmonic passage, second harmonic passage and triple-frequency harmonics passage by described the first switch (14) respectively, each passage carries out filtering by first-harmonic filter (11), second harmonic filter (12) and triple frequency harmonic filter (13) to the radiofrequency signal entering this passage respectively, preselected radio frequency signal needed for generation, this preselected radio frequency signal enters intermediate-freuqncy signal through second switch (15) and generates and processing unit (2).
3. a kind of superhet harmonic measurement device based on harmonic mixing 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) is connected successively with digital down converter (25), described synchronous circuit (27) is arranged between local vibration source (26) and digital down converter (25), the input of described frequency mixer (21) respectively with the output of the first-harmonic filter (11) in radio-frequency channel selected cell (1), the output of second harmonic filter (12) is connected with the output of triple frequency harmonic filter (13),
The local frequency mixing that the preselected radio frequency signal frequency received and local vibration source (26) export is produced the fixing analog intermediate frequency signal of a frequency by described frequency mixer (21), this analog intermediate frequency signal enters digital down converter (25) successively after intermediate-frequency filter (22), intermediate frequency amplifier (23) and A-D converter (24) convert digital intermediate frequency signal to, and this digital down converter (25) carries out filtering to digital intermediate frequency signal successively, bandwidth is shaped and export final measurement signals after detection process.
4. a kind of superhet harmonic measurement device based on harmonic mixing according to claim 3, is characterized in that, described digital down converter (25) is realized by FPGA.
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| CN104467994A (en) * | 2013-10-11 | 2015-03-25 | 优倍快网络公司 | Wireless radio system optimization by persistent spectrum analysis |
| CN104635062A (en) * | 2015-01-23 | 2015-05-20 | 北京邮电大学 | Environment electromagnetic radiation monitoring system |
| CN105959019A (en) * | 2016-06-01 | 2016-09-21 | 中国电子科技集团公司第四十研究所 | Large-bandwidth communication signal receiving and analyzing device and method based on dual-channel phase superposition |
| CN106226594A (en) * | 2016-10-09 | 2016-12-14 | 中国科学院云南天文台 | Superhet solar radio radiation meter systems for radio astronomy protection frequency |
| CN107196673A (en) * | 2017-06-05 | 2017-09-22 | 中国电子科技集团公司第四十研究所 | A kind of signal analysis device and method based on any variable number intermediate frequency |
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| CN107196673A (en) * | 2017-06-05 | 2017-09-22 | 中国电子科技集团公司第四十研究所 | A kind of signal analysis device and method based on any variable number intermediate frequency |
| CN109799445B (en) * | 2017-11-17 | 2024-03-19 | 核工业西南物理研究院 | Millimeter wave band microwave polarization parameter measurement system |
| CN109799445A (en) * | 2017-11-17 | 2019-05-24 | 核工业西南物理研究院 | Millimere-wave band microwave polarization parameter measuring system |
| CN108512559B (en) * | 2018-01-18 | 2024-01-30 | 加特兰微电子科技(上海)有限公司 | Transformer, radio frequency receiving device and control method thereof |
| CN108512559A (en) * | 2018-01-18 | 2018-09-07 | 加特兰微电子科技(上海)有限公司 | Transformer, RF Receiving Device and its control method |
| CN109361477A (en) * | 2018-11-13 | 2019-02-19 | 中电科仪器仪表有限公司 | A kind of Instantaneous Frequency Measurement device and measurement method |
| CN109361477B (en) * | 2018-11-13 | 2021-04-13 | 中电科思仪科技股份有限公司 | Instantaneous frequency measuring device and measuring method |
| CN109660306B (en) * | 2019-02-18 | 2024-02-20 | 上海创远仪器技术股份有限公司 | NB-IoT terminal comprehensive measurement device with 8 ports and comprehensive measurement control method thereof |
| CN109660306A (en) * | 2019-02-18 | 2019-04-19 | 上海创远仪器技术股份有限公司 | The comprehensive survey device of NB-IoT terminal and its comprehensive survey control method with 8 ports |
| CN112039544A (en) * | 2020-07-31 | 2020-12-04 | 西安凌北电子科技有限公司 | Three-channel direct-sampling radio frequency module |
| CN112436902A (en) * | 2020-11-09 | 2021-03-02 | 维沃移动通信有限公司 | Signal detection circuit and electronic device |
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