CN110677161A - Standing-wave ratio test system - Google Patents
Standing-wave ratio test system Download PDFInfo
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- CN110677161A CN110677161A CN201911003424.2A CN201911003424A CN110677161A CN 110677161 A CN110677161 A CN 110677161A CN 201911003424 A CN201911003424 A CN 201911003424A CN 110677161 A CN110677161 A CN 110677161A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
- G01R27/06—Measuring reflection coefficients; Measuring standing-wave ratio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/104—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof of other parameters, e.g. DC offset, delay or propagation times
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The invention discloses a standing-wave ratio testing system, which comprises a transmitting system, a radio-frequency antenna, a frequency synthesis module, a data sampling module, a frequency mixing module, a wave detection and shaping module and an upper computer, wherein the transmitting system is connected with the upper computer; the frequency synthesis module comprises a double-channel DDS chip, the input end of the double-channel DDS chip is connected with the transmitting system, frequency information transmitted by the transmitting system is received, two DDS signals are generated simultaneously, one DDS signal is filtered and amplified through a first filter and a first amplifier to form a radio frequency signal which is output by a radio frequency antenna, the other DDS signal is filtered and amplified through a second filter and a second amplifier to output a first local oscillation signal through a first output port, and a second local oscillation signal is output through a first output port. The invention provides a fast, real-time, low-cost and high-reliability standing-wave ratio testing system which is used for judging the size of the standing-wave ratio in real time, and feeding back the size to a transmitting system in time to cut off an excitation signal when the standing-wave ratio is overlarge, so that the safety of transmitting equipment and a communication channel is protected.
Description
Technical Field
The invention relates to the technical field of electronic testing, in particular to a standing-wave ratio testing system.
Background
At present, in a short wave communication system, limited by using conditions, installation positions and other reasons, whip antennas or telescopic antennas are mostly adopted, because antenna parameters have large changes in short wave bands, and the standing-wave ratio is an important index for measuring whether a transmitting device is matched with an antenna feed system, under an ideal condition, the standing-wave ratio is equal to 1, which indicates that no reflection signal exists in the communication process, and in the actual working process, reflection signals exist, and in order to protect transmitting devices, the reflection signals need to be in a certain range, namely the standing-wave ratio needs to be smaller than a certain set limit, so that the size of the standing-wave ratio needs to be paid attention to in real time during communication, and unnecessary damage to the transmitting devices or transmitting channels caused by overlarge reflection signals in the communication process is prevented. The standing-wave ratio test before signal transmission is mainly carried out by a special instrument, the interface is fixed, the purchase cost of the instrument is high, the electromagnetic environment condition around the antenna feed system needs to be paid attention to in real time in the using process, the radiation resistance of a port of the special instrument is low, the special instrument is easy to damage, and the maintenance cost is high after the special instrument is damaged; when the standing wave ratio is transmitted, the standing wave ratio measured before transmission is mainly used as a basis, the size of the standing wave ratio is judged through the reflected voltage, and when the size exceeds a certain range, the excitation signal is cut off, so that the safety of equipment is protected. The invention provides a standing-wave ratio testing system which is rapid, real-time, low in cost and high in reliability.
Disclosure of Invention
The invention aims to provide a standing-wave ratio testing system which is used for judging the size of the standing-wave ratio in real time, and feeding back the size to a transmitting system in time to cut off an excitation signal when the standing-wave ratio is too large, so that the safety of transmitting equipment and a communication channel is protected.
In order to achieve the purpose, the technical scheme of the invention is as follows: a standing-wave ratio testing system comprises a transmitting system, a radio-frequency antenna, a frequency synthesis module, a data sampling module, a frequency mixing module, a wave detection and shaping module and an upper computer; wherein the content of the first and second substances,
the frequency synthesis module comprises a double-channel DDS chip, the input end of the double-channel DDS chip is connected with the transmitting system, receives frequency information transmitted by the transmitting system and simultaneously generates two DDS signals; the upper channel of the double-channel DDS chip is connected with a first filter, the output end of the first filter is connected with a first amplifier, the first amplifier is connected with the radio-frequency antenna, and one path of DDS signal is filtered and amplified by the first filter and the first amplifier to form a radio-frequency signal which is output by the radio-frequency antenna; the lower channel of the double-channel DDS chip is connected with a second filter, the output end of the second filter is connected with a second amplifier, the other path of DDS signal is filtered and amplified by the second filter and the second amplifier, and then a first local oscillation signal is output through a first output port of the second amplifier, and a second local oscillation signal is output through a second output port of the second amplifier;
the data sampling module comprises a parallel network, the input end of the parallel network is connected with the output end of the first amplifier, the upper branch of the parallel network is provided with a current sampling circuit, the lower branch of the parallel network is provided with a voltage sampling circuit, the parallel network receives the radio-frequency signal, samples and outputs a current signal through the current sampling circuit, and samples and outputs a voltage signal through the voltage sampling circuit;
the frequency mixing module comprises a third amplifier and a fourth amplifier, the input end of the third amplifier is connected with the output end of the current sampling circuit, the output end of the third amplifier is connected to the first input end of the first frequency mixer, the second input end of the first frequency mixer is connected with the first output port, and the current signal is amplified by the third amplifier, then is subjected to frequency mixing processing with the first local oscillation signal and outputs a first intermediate frequency signal; the input end of the fourth amplifier is connected with the output end of the voltage sampling circuit, the output end of the fourth amplifier is connected to the first input end of the second mixer, the second input end of the second mixer is connected with the second output port, and the voltage signal is amplified by the fourth amplifier, then is subjected to frequency mixing processing with the second local oscillation signal and outputs a second intermediate frequency signal;
the detection and shaping module comprises a third filter and a fourth filter, the input end of the third filter is connected with the output end of the first mixer, the output end of the third filter is connected with a fifth amplifier, the output end of the fifth amplifier is connected with a first detection circuit, and the first intermediate frequency signal is filtered and amplified by the third filter and the fifth amplifier and then is detected by the first detection circuit to output current information; the input end of the fourth filter is connected with the output end of the second mixer, the output end of the fourth filter is connected with a sixth amplifier, the output end of the sixth amplifier is connected with a second detection circuit, and the second intermediate-frequency signal is filtered and amplified by the fourth filter and the sixth amplifier and then is detected by the second detection circuit to output voltage information; the output end of the third filter is also connected with a first shaping circuit, the output end of the fourth filter is also connected with a second shaping circuit, the gate circuit is respectively connected with the output ends of the first shaping circuit and the second shaping circuit, and the shaped current signal and the shaped voltage signal are processed by the gate circuit to output phase information; and the detection and shaping module sends the current information, the voltage information and the phase information to an upper computer, and the standing-wave ratio is obtained through calculation processing.
Furthermore, the input end of the double-channel DDS chip is provided with an RS422 port, and the double-channel DDS chip is connected with the transmitting system through the RS422 port to receive the frequency information.
Further, the first intermediate frequency signal and the second intermediate frequency signal are both 16kHz intermediate frequencies which are low in frequency and are fixed and unchangeable.
Furthermore, the first detector circuit and the second detector circuit are both active detector circuits.
Furthermore, the upper computer is also connected with a display device for displaying the standing-wave ratio.
The invention has the beneficial effects that: the standing-wave ratio testing system is fast, real-time, low in cost and high in reliability, is used for judging the size of the standing-wave ratio in real time, timely feeds back the signal sending system to cut off an excitation signal when the standing-wave ratio is too large, protects the safety of signal sending equipment and a communication channel, can greatly improve the working efficiency, and in addition, compared with the measurement of a traditional special instrument, the instrument purchase and maintenance cost is greatly reduced.
Drawings
FIG. 1 is a block diagram schematically illustrating the structure of the present invention;
FIG. 2 is a circuit diagram of a frequency synthesis module according to the present invention;
FIG. 3 is a circuit schematic of a data sampling module;
FIG. 4 is a circuit diagram of a mixer module;
FIG. 5 is a schematic circuit diagram of a detection and shaping module;
in the figure, 1, a transmitting system; 2. a radio frequency antenna; 3. a frequency synthesis module; 4. a data sampling module; 5. a frequency mixing module; 6. a wave detection and shaping module; 7. an upper computer; 31. a dual-channel DDS chip; 32. a first filter; 33. a first amplifier; 34. a second filter; 35. a second amplifier; 41. a parallel network; 42. a current sampling circuit; 43. a voltage sampling circuit; 51. a third amplifier; 52. a fourth amplifier; 53. a first mixer; 54. a second mixer; 61. a third filter; 62. a fourth filter; 63. a fifth amplifier; 64. a first detection circuit; 65. a sixth amplifier; 66. a second detection circuit; 67. a first shaping circuit; 68. a second shaping circuit; 69. and a gate circuit.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1-5, a standing-wave ratio testing system includes a transmitting system 1, a radio-frequency antenna 2, a frequency synthesizing module 3, a data sampling module 4, a frequency mixing module 5, a detecting and shaping module 6, and an upper computer 7; wherein the content of the first and second substances,
the frequency synthesis module 3 comprises a dual-channel DDS chip 31, an RS422 port is arranged at the input end of the dual-channel DDS chip 31, the dual-channel DDS chip is connected with the transmitting system 1 through the RS422 port, frequency information transmitted by the transmitting system 1 is received, and two DDS signals are generated at the same time; the upper channel of the dual-channel DDS chip 31 is connected with a first filter 32, the output end of the first filter 32 is connected with a first amplifier 33, the first amplifier 33 is connected with the radio-frequency antenna 2, and one path of DDS signal is filtered and amplified by the first filter 32 and the first amplifier 33 to form a radio-frequency signal which is output by the radio-frequency antenna 2; a second filter 34 is connected to a lower channel of the dual-channel DDS chip 31, an output end of the second filter 34 is connected to a second amplifier 35, and the other path of DDS signal is filtered and amplified by the second filter 34 and the second amplifier 35, and then a first local oscillation signal is output through a first output port of the second amplifier 35, and a second local oscillation signal is output through a second output port of the second amplifier 35;
the data sampling module 4 comprises a parallel network 41, the input end of the parallel network 41 is connected with the output end of the first amplifier 33, the upper branch of the parallel network 41 is provided with a current sampling circuit 42, the lower branch of the parallel network 41 is provided with a voltage sampling circuit 43, the parallel network 41 receives the radio frequency signal, samples and outputs a current signal through the current sampling circuit 42, and samples and outputs a voltage signal through the voltage sampling circuit 43;
the frequency mixing module 5 includes a third amplifier 51 and a fourth amplifier 52, an input end of the third amplifier 51 is connected to an output end of the current sampling circuit 42, an output end of the third amplifier 51 is connected to a first input end of a first mixer 53, a second input end of the first mixer 53 is connected to the first output port, and the current signal is amplified by the third amplifier 51, then is subjected to frequency mixing processing with a first local oscillation signal, and outputs a first intermediate frequency signal; the input end of the fourth amplifier 52 is connected to the output end of the voltage sampling circuit 43, the output end of the fourth amplifier 52 is connected to the first input end of the second mixer 54, the second input end of the second mixer 54 is connected to the second output port, and the voltage signal is amplified by the fourth amplifier 52, then is subjected to frequency mixing processing with the second local oscillation signal, and a second intermediate frequency signal is output; the first intermediate frequency signal and the second intermediate frequency signal are both 16kHz intermediate frequencies which are low in frequency and are fixed and unchangeable;
the detection and shaping module 6 comprises a third filter 61 and a fourth filter 62, the input end of the third filter 61 is connected with the output end of the first mixer 53, the output end of the third filter 61 is connected with a fifth amplifier 63, the output end of the fifth amplifier 63 is connected with a first detection circuit 64, and the first intermediate frequency signal is filtered and amplified by the third filter 61 and the fifth amplifier 63 and then detected by the first detection circuit 64 to output current information; the input end of the fourth filter 62 is connected to the output end of the second mixer 54, the output end of the fourth filter 62 is connected to a sixth amplifier 65, the output end of the sixth amplifier 65 is connected to a second detector circuit 66, and the second intermediate frequency signal is filtered and amplified by the fourth filter 62 and the sixth amplifier 65, and then is detected by the second detector circuit 66 to output voltage information; the first detector circuit 64 and the second detector circuit 66 are both active detector circuits; the output end of the third filter 61 is further connected with a first shaping circuit 67, the output end of the fourth filter 62 is further connected with a second shaping circuit 68, a gate circuit 69 is respectively connected with the output ends of the first shaping circuit 67 and the second shaping circuit 68, and the shaped current signal and the shaped voltage signal are processed by the gate circuit 69 to output phase information; and the detection and shaping module 6 sends the current information, the voltage information and the phase information to the upper computer 7, and the standing-wave ratio is obtained through calculation processing. The upper computer 7 is also connected with a display device for displaying the standing-wave ratio.
According to the invention, after the relevant frequency information is received, the standing-wave ratio of the antenna feed system is obtained through corresponding sampling and calculation, and when the standing-wave ratio is too large, the standing-wave ratio is timely fed back to the transmitting system 1 to cut off an excitation signal, so that the safety of transmitting equipment and a communication channel is protected.
In the above embodiment, the frequency synthesis module 3 performs direct digital frequency synthesis based on the dual-channel DDS chip 31, and can simultaneously generate two DDS signals by receiving external related frequency information, and after filtering and amplifying, the two DDS signals are respectively used as a radio frequency signal and a local oscillator signal, and the two DDS signals are independent from each other in terms of frequency, phase, amplitude, and the like, and do not affect each other.
In the above embodiment, the data sampling module 4 mainly receives the relevant radio frequency information in the frequency synthesis module 3, and realizes the relevant information acquisition of the antenna feed system under the micropower. The module can be used as a reference to judge the voltage and current values of the antenna feed system to be tested by collecting related information on an internal standard non-inductive 50-ohm load, and the accuracy of the collected voltage and current directly influences the accuracy of the final test result.
In the above embodiment, the frequency mixing module 5 amplifies the relevant information of the antenna feeder system collected by the data sampling module 4, and then performs frequency mixing processing on the amplified information and the local oscillation information to obtain relevant intermediate frequency information. In the scheme, high-frequency signals in the whole bandwidth are converted into 16kHz intermediate frequency with low and constant frequency, signal amplification is carried out on the intermediate frequency, high gain can be kept in the whole circuit without self-excitation, the circuit works stably, and the performance index of the whole machine can be improved.
In the above embodiment, the detection and shaping module 6 performs detection and shaping after filtering and amplifying the mixed intermediate frequency information. The scheme adopts active detection, and improves the detection precision and linearity. And obtaining related information (analog quantity) of the antenna feed system under the corresponding frequency, and obtaining the standing-wave ratio corresponding to the corresponding frequency after data processing.
The standing-wave ratio testing system is used for judging the size of the standing-wave ratio in real time, feeding back the standing-wave ratio to a transmitting system in time when the standing-wave ratio is too large so as to cut off an excitation signal, protecting the safety of transmitting equipment and a communication channel, and greatly improving the working efficiency.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
Claims (5)
1. A standing-wave ratio test system is characterized by comprising a transmitting system, a radio-frequency antenna, a frequency synthesis module, a data sampling module, a frequency mixing module, a wave detection and shaping module and an upper computer; wherein the content of the first and second substances,
the frequency synthesis module comprises a double-channel DDS chip, the input end of the double-channel DDS chip is connected with the transmitting system, receives frequency information transmitted by the transmitting system and simultaneously generates two DDS signals; the upper channel of the double-channel DDS chip is connected with a first filter, the output end of the first filter is connected with a first amplifier, the first amplifier is connected with the radio-frequency antenna, and one path of DDS signal is filtered and amplified by the first filter and the first amplifier to form a radio-frequency signal which is output by the radio-frequency antenna; the lower channel of the double-channel DDS chip is connected with a second filter, the output end of the second filter is connected with a second amplifier, the other path of DDS signal is filtered and amplified by the second filter and the second amplifier, and then a first local oscillation signal is output through a first output port of the second amplifier, and a second local oscillation signal is output through a second output port of the second amplifier;
the data sampling module comprises a parallel network, the input end of the parallel network is connected with the output end of the first amplifier, the upper branch of the parallel network is provided with a current sampling circuit, the lower branch of the parallel network is provided with a voltage sampling circuit, the parallel network receives the radio-frequency signal, samples and outputs a current signal through the current sampling circuit, and samples and outputs a voltage signal through the voltage sampling circuit;
the frequency mixing module comprises a third amplifier and a fourth amplifier, the input end of the third amplifier is connected with the output end of the current sampling circuit, the output end of the third amplifier is connected to the first input end of the first frequency mixer, the second input end of the first frequency mixer is connected with the first output port, and the current signal is amplified by the third amplifier, then is subjected to frequency mixing processing with the first local oscillation signal and outputs a first intermediate frequency signal; the input end of the fourth amplifier is connected with the output end of the voltage sampling circuit, the output end of the fourth amplifier is connected to the first input end of the second mixer, the second input end of the second mixer is connected with the second output port, and the voltage signal is amplified by the fourth amplifier, then is subjected to frequency mixing processing with the second local oscillation signal and outputs a second intermediate frequency signal;
the detection and shaping module comprises a third filter and a fourth filter, the input end of the third filter is connected with the output end of the first mixer, the output end of the third filter is connected with a fifth amplifier, the output end of the fifth amplifier is connected with a first detection circuit, and the first intermediate frequency signal is filtered and amplified by the third filter and the fifth amplifier and then is detected by the first detection circuit to output current information; the input end of the fourth filter is connected with the output end of the second mixer, the output end of the fourth filter is connected with a sixth amplifier, the output end of the sixth amplifier is connected with a second detection circuit, and the second intermediate-frequency signal is filtered and amplified by the fourth filter and the sixth amplifier and then is detected by the second detection circuit to output voltage information; the output end of the third filter is also connected with a first shaping circuit, the output end of the fourth filter is also connected with a second shaping circuit, the gate circuit is respectively connected with the output ends of the first shaping circuit and the second shaping circuit, and the shaped current signal and the shaped voltage signal are processed by the gate circuit to output phase information; and the detection and shaping module sends the current information, the voltage information and the phase information to an upper computer, and the standing-wave ratio is obtained through calculation processing.
2. The standing-wave ratio test system of claim 1, wherein an RS422 port is provided at an input end of the dual-channel DDS chip, and the dual-channel DDS chip is connected to the transmission system through the RS422 port to receive the frequency information.
3. The standing-wave ratio test system of claim 1, wherein the first intermediate frequency signal and the second intermediate frequency signal are both 16kHz intermediate frequencies that are low in frequency and are fixed and unchanging.
4. The standing-wave ratio test system of claim 1, wherein the first detector circuit and the second detector circuit are both active detector circuits.
5. The standing-wave ratio test system according to claim 1, wherein the upper computer is further connected with a display device for displaying the standing-wave ratio.
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| CN201911003424.2A CN110677161B (en) | 2019-10-22 | 2019-10-22 | Standing-wave ratio test system |
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| CN110677161B CN110677161B (en) | 2021-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112235014A (en) * | 2020-10-13 | 2021-01-15 | Oppo广东移动通信有限公司 | Radio frequency circuit adjusting method and device, electronic equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1837834A (en) * | 2005-07-28 | 2006-09-27 | 南京长盛仪器有限公司 | Digital phase-sensitive detector for intelligent element parameter tester |
| CN103427915A (en) * | 2012-05-25 | 2013-12-04 | 中兴通讯股份有限公司 | Method and apparatus for interference elimination in standing-wave ratio detection of radio frequency equipment |
| CN105759197A (en) * | 2016-03-28 | 2016-07-13 | 工业和信息化部电子第五研究所 | System and method for acquiring DDS device single event effect abnormal waveforms |
| CN106953600A (en) * | 2017-02-28 | 2017-07-14 | 安徽白鹭电子科技有限公司 | A kind of rearmounted mixing type numeral ALC control system devices based on DDS |
| CN109581321A (en) * | 2019-01-25 | 2019-04-05 | 南京大学 | A kind of more waveform signals of radar that can flexibly load parameter generate and apparatus for demonstrating |
-
2019
- 2019-10-22 CN CN201911003424.2A patent/CN110677161B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1837834A (en) * | 2005-07-28 | 2006-09-27 | 南京长盛仪器有限公司 | Digital phase-sensitive detector for intelligent element parameter tester |
| CN103427915A (en) * | 2012-05-25 | 2013-12-04 | 中兴通讯股份有限公司 | Method and apparatus for interference elimination in standing-wave ratio detection of radio frequency equipment |
| CN105759197A (en) * | 2016-03-28 | 2016-07-13 | 工业和信息化部电子第五研究所 | System and method for acquiring DDS device single event effect abnormal waveforms |
| CN106953600A (en) * | 2017-02-28 | 2017-07-14 | 安徽白鹭电子科技有限公司 | A kind of rearmounted mixing type numeral ALC control system devices based on DDS |
| CN109581321A (en) * | 2019-01-25 | 2019-04-05 | 南京大学 | A kind of more waveform signals of radar that can flexibly load parameter generate and apparatus for demonstrating |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112235014A (en) * | 2020-10-13 | 2021-01-15 | Oppo广东移动通信有限公司 | Radio frequency circuit adjusting method and device, electronic equipment and storage medium |
| CN112235014B (en) * | 2020-10-13 | 2022-05-17 | Oppo广东移动通信有限公司 | Radio frequency circuit adjusting method and device, electronic equipment and storage medium |
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