CN211791529U - In-band flatness comprehensive test system for radio frequency channel of broadband communication receiver - Google Patents
In-band flatness comprehensive test system for radio frequency channel of broadband communication receiver Download PDFInfo
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- CN211791529U CN211791529U CN202020433895.9U CN202020433895U CN211791529U CN 211791529 U CN211791529 U CN 211791529U CN 202020433895 U CN202020433895 U CN 202020433895U CN 211791529 U CN211791529 U CN 211791529U
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Abstract
A comprehensive test system for flatness in a radio frequency channel of a broadband communication receiver relates to the field of communication receivers and mainly comprises a digital processing unit, a radio frequency channel processing unit, a frequency spectrograph, a signal source and an upper computer.
Description
Technical Field
The utility model relates to a communication receiver field, in particular to flatness integrated test system in broadband communication receiver radio frequency channel band.
Background
The broadband communication receiver is widely applied to communication equipment such as a wireless base station and a wired transmission network, and the technical fields such as radar and aerospace, the in-band flatness of the broadband communication receiver is an important technical index of the broadband receiver, the in-band flatness is an Inband spectrum indicator, which is an amplitude variation of each frequency point of an in-band signal relative to a central frequency, and is used as an important index for measuring linear distortion in a transmission link all the time, because impedance mismatching between devices in the whole transmission link is a direct cause for influencing the in-band flatness of an output signal, regardless of frequency selectivity of an amplifying circuit and analog filters of each stage, and because the requirement on the in-band flatness in national standard is that the difference of the in-band flatness is not more than 0.5dB within +/-3.59 MHz of the central frequency.
In-band flatness adjustment of an existing broadband receiver, a radio frequency designer tests attenuation of each frequency point by using a frequency spectrograph and a signal source, a result is programmed and converted into a control instruction for a digital processor, the radio frequency designer confirms the configured result after configuration, if the result is different from an initial design or the index is not satisfied due to actual difference of hardware circuit environment and simulation, the digital processor needs to perform programming modification of the control instruction again or repeatedly according to the test result of the radio frequency designer until the result reaches a required index, the process is complicated, the cost of consumed manpower and material resources is high, especially when the bandwidth is very wide, different temperature ranges are wide, the number of in-band frequency points is large, and when some frequency points can reach hundreds of thousands of frequency points, the modification amount is large, and the occupied manpower and material resources are more.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the comprehensive testing system for the flatness in the radio frequency channel of the broadband communication receiver solves the problems that in the prior art, when the actual hardware circuit environment is different from the initial design or the indexes are not met, a digital processor needs to modify a control instruction for multiple times according to the testing result of a radio frequency designer until the result reaches the required indexes, the process is complex, and the cost of manpower and material resources is high.
The utility model adopts the technical scheme as follows:
a comprehensive test system for flatness in a radio frequency channel of a broadband communication receiver comprises a digital processing unit, a radio frequency channel processing unit, a frequency spectrograph, a signal source and an upper computer,
a digital processing unit: the digital control attenuator and the frequency conversion unit are connected with the upper computer and the radio frequency channel processing unit and used for analyzing and receiving a control command of the upper computer and controlling the radio frequency channel processing unit;
a radio frequency channel processing unit: outputting corresponding signal waveforms according to the received control instruction of the digital processing unit;
a frequency spectrograph: configured to receive a signal waveform of the radio frequency channel processing unit and display the signal waveform;
a signal source: configured to provide a front-end radio frequency input signal to a radio frequency channel processing unit;
an upper computer: and providing frequency modulation information and a control value of the numerical control attenuator for the radio frequency channel processing unit, and acquiring a waveform index of an output waveform of the frequency spectrograph.
The system is used for carrying out the in-band flatness comprehensive test of the radio frequency channel of the broadband communication receiver, a radio frequency designer inputs a target value in an upper computer according to preset indexes of system design, the target value comprises a flatness value, channel gain, a channel starting frequency point and a channel stopping frequency point, the upper computer sends signal source frequency information according to a data reference communication protocol of the target value, the upper computer sends the frequency information and attenuation information to a radio frequency channel processing unit according to a fixed time sequence after carrying out a series of processing on the frequency information and the attenuation information by controlling a digital processing unit, the radio frequency channel processing unit which receives the frequency information successfully outputs a waveform of corresponding frequency and displays the waveform on a frequency spectrograph, then the upper computer reads the waveform information on the frequency spectrograph to judge whether the flatness meets the requirement, the upper computer records parameter information if the flatness meets the requirement, the parameters are readjusted and the parameters, until the requirements are reached.
And finally, exporting all frequency point information corresponding parameters from the upper computer, supplying the parameters to a control system software personnel of the radio frequency channel processing unit, and inputting the parameters into a radio frequency control system, so that the amplitude compensation quantity of all frequency points can be obtained, and all frequency points of all signal sources have corresponding amplitude compensation quantities meeting requirements, so that the flatness in the band corresponding to the amplitude compensation quantities meets the requirements.
Further, the radio frequency channel processing unit is a radio frequency channel of the broadband communication receiver, the input of the radio frequency channel processing unit is radio frequency, and the output of the radio frequency channel processing unit is radio frequency or intermediate frequency.
Furthermore, the digital processing unit adopts an FPGA programmable logic device.
Furthermore, the upper computer is connected with the frequency spectrograph and/or the signal source through a GPIB line.
Further, the upper computer is a computer.
Furthermore, the communication mode of the upper computer and the digital processing unit is SPI communication or RS232 communication.
The upper computer issues frequency information and attenuation information to the digital processing unit, the FPGA in the digital processing unit is responsible for resolving commands, then a radio frequency channel of the broadband communication receiver receives control information issued by the upper computer and controls frequency conversion and attenuation control of the radio frequency channel, the upper computer compares preset indexes through results obtained from a frequency spectrograph to judge whether the preset indexes meet requirements or not, and manual testing of each frequency point of designers is not needed. If the current frequency point is qualified, the upper computer automatically stores the attenuation information of the current frequency point, and if the current frequency point is not qualified, the upper computer continues to adjust. And finally, exporting the test result to a control system software worker of the radio frequency channel processing unit and inputting the test result to the control system.
The utility model discloses utilize the signal waveform information of host computer received frequency spectrograph, judge whether qualified of index, and manual or automatic parameter instruction of issuing, the value of the numerical control attenuator of the corresponding frequency point information of renewal again, flatness in the broadband frequency band that reaches the receiver reaches the target value, and derive the numerical control attenuation information of in-band frequency point, it can to input control system to provide radio frequency channel processing unit control system software personnel, there are digital processing personnel to compile host computer and FPGA program earlier on, later stage test only need radio frequency designer debug can, radio frequency channel processing unit control system software personnel's debugging parameter has been reduced repeatedly, efficiency is improved.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model relates to a comprehensive test system of flatness in broadband communication receiver radio frequency channel band, use the host computer to send signal source frequency information according to the target value, the digital processing unit of the secondary control issues frequency information and decay information to radio frequency channel processing unit, radio frequency channel processing unit can export the waveform and show on the frequency spectrograph, read the waveform information on the frequency spectrograph by the host computer, judge whether the flatness meets the requirements, the host computer records parameter information if meeting the requirements, if can not meet the requirements, readjust the parameter, continue to issue, until meeting the requirements, can realize the automatic adjustment parameter, reduce manpower and materials cost;
2. the utility model relates to a comprehensive test system for flatness in a radio frequency channel band of a broadband communication receiver, which uses an upper computer to send signal source frequency information according to a target value, then controls a digital processing unit to send the frequency information and attenuation information to a radio frequency channel processing unit, the radio frequency channel processing unit can output waveforms and display the waveforms on a frequency spectrograph, the upper computer reads the waveform information on the frequency spectrograph to judge whether the flatness meets the requirement, the upper computer records parameter information when the flatness meets the requirement, if the flatness can not meet the requirement, the parameters are readjusted and continuously sent until the flatness meets the requirement, automatic adjustment setting of amplitude compensation parameters can be carried out for all frequency points in a frequency band, the incomplete coverage surface of manual setting is avoided, and the problem that when the actual difference between a hardware circuit environment and simulation results in difference with the initial design or the index can not be solved, the problem of requiring the instruction to be modified again or multiple times.
Drawings
In order to more clearly illustrate the technical solution, the drawings needed to be used in the embodiments are briefly described below, and it should be understood that, for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts, wherein:
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is another functional block diagram of the present invention;
FIG. 3 is a partial circuit schematic of the present invention;
fig. 4 is a partial circuit schematic of the present invention;
fig. 5 is a partial circuit schematic of the present invention;
fig. 6 is a partial circuit schematic diagram of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments, and therefore should not be considered as limitations to the scope of protection. Based on the embodiments in the present invention, all other embodiments obtained by the staff of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in detail with reference to fig. 1 to 6.
Example 1
A comprehensive test system for flatness in a radio frequency channel of a broadband communication receiver, as shown in figure 1, comprises a digital processing unit, a radio frequency channel processing unit, a frequency spectrograph, a signal source and an upper computer,
a digital processing unit: the digital control attenuator and the frequency conversion unit are connected with the upper computer and the radio frequency channel processing unit and used for analyzing and receiving a control command of the upper computer and controlling the radio frequency channel processing unit;
a radio frequency channel processing unit: outputting corresponding signal waveforms according to the received control instruction of the digital processing unit;
a frequency spectrograph: configured to receive a signal waveform of the radio frequency channel processing unit and display the signal waveform;
a signal source: configured to provide a front-end radio frequency input signal to a radio frequency channel processing unit;
an upper computer: and providing frequency modulation information and a control value of the numerical control attenuator for the radio frequency channel processing unit, and acquiring a waveform index of an output waveform of the frequency spectrograph.
The system is used for carrying out the in-band flatness comprehensive test of the radio frequency channel of the broadband communication receiver, a radio frequency designer inputs a target value in an upper computer according to preset indexes of system design, the target value comprises a flatness value, channel gain, a channel starting frequency point and a channel stopping frequency point, the upper computer sends signal source frequency information according to a data reference communication protocol of the target value, the upper computer sends the frequency information and attenuation information to a radio frequency channel processing unit according to a fixed time sequence after carrying out a series of processing on the frequency information and the attenuation information by controlling a digital processing unit, the radio frequency channel processing unit which receives the frequency information successfully outputs a waveform of corresponding frequency and displays the waveform on a frequency spectrograph, then the upper computer reads the waveform information on the frequency spectrograph to judge whether the flatness meets the requirement, the upper computer records parameter information if the flatness meets the requirement, the parameters are readjusted and the parameters, until the requirements are reached.
And finally, exporting all frequency point information corresponding parameters from the upper computer, supplying the parameters to a control system software personnel of the radio frequency channel processing unit, and inputting the parameters into a radio frequency control system, so that the amplitude compensation quantity of all frequency points can be obtained, and all frequency points of all signal sources have corresponding amplitude compensation quantities meeting requirements, so that the flatness in the band corresponding to the amplitude compensation quantities meets the requirements.
Example 2
A comprehensive test system for flatness in a radio frequency channel of a broadband communication receiver, as shown in figure 2, comprises a digital processing unit, a radio frequency channel processing unit, a frequency spectrograph, a signal source and an upper computer,
a digital processing unit: an FPGA programmable logic device is adopted to connect an upper computer and a radio frequency channel processing unit, and is used for analyzing and receiving a control command of the upper computer and controlling a numerical control attenuator and a frequency conversion unit of the radio frequency channel processing unit;
a radio frequency channel processing unit: adopting a radio frequency channel of a broadband communication receiver, wherein the input of the radio frequency channel is radio frequency, the output of the radio frequency channel is radio frequency or intermediate frequency, and outputting a corresponding signal waveform according to a received control instruction of a digital processing unit;
a frequency spectrograph: configured to receive a signal waveform of the radio frequency channel processing unit and display the signal waveform;
a signal source: configured to provide a front-end radio frequency input signal to a radio frequency channel processing unit;
an upper computer: the upper computer is set as a computer, is connected with the frequency spectrograph and/or the signal source through a GPIB (general purpose interface bus) line, is in SPI (serial peripheral interface) communication or RS232 communication with the digital processing unit, provides frequency modulation information and a control value of the numerical control attenuator for the radio frequency channel processing unit, and acquires a waveform index of an output waveform of the frequency spectrograph.
The upper computer issues frequency information and attenuation information to the digital processing unit, the FPGA in the digital processing unit is responsible for resolving commands, then a radio frequency channel of the broadband communication receiver receives control information issued by the upper computer and controls frequency conversion and attenuation control of the radio frequency channel, the upper computer compares preset indexes through results obtained from a frequency spectrograph to judge whether the preset indexes meet requirements or not, and manual testing of each frequency point of designers is not needed. If the current frequency point is qualified, the upper computer automatically stores the attenuation information of the current frequency point, and if the current frequency point is not qualified, the upper computer continues to adjust. And finally, exporting the test result to a control system software worker of the radio frequency channel processing unit and inputting the test result to the control system.
The utility model discloses utilize the signal waveform information of host computer received frequency spectrograph, judge whether qualified of index, and manual or automatic parameter instruction of issuing, the value of the numerical control attenuator of the corresponding frequency point information of renewal again, flatness in the broadband frequency band that reaches the receiver reaches the target value, and derive the numerical control attenuation information of in-band frequency point, it can to input control system to provide radio frequency channel processing unit control system software personnel, there are digital processing personnel to compile host computer and FPGA program earlier on, later stage test only need radio frequency designer debug can, radio frequency channel processing unit control system software personnel's debugging parameter has been reduced repeatedly, efficiency is improved.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
Example 3
A comprehensive test system for flatness in a radio frequency channel of a broadband communication receiver is disclosed, as shown in FIG. 3-FIG. 6, which is a circuit diagram of the comprehensive test system, and comprises a digital processing unit, a radio frequency channel processing unit, a frequency spectrograph, a signal source and an upper computer,
a digital processing unit: an FPGA programmable logic device is adopted to connect an upper computer and a radio frequency channel processing unit, and is used for analyzing and receiving a control command of the upper computer and controlling a numerical control attenuator and a frequency conversion unit of the radio frequency channel processing unit;
a radio frequency channel processing unit: adopting a radio frequency channel of a broadband communication receiver, wherein the input of the radio frequency channel is radio frequency, the output of the radio frequency channel is radio frequency or intermediate frequency, and outputting a corresponding signal waveform according to a received control instruction of a digital processing unit;
a frequency spectrograph: configured to receive a signal waveform of the radio frequency channel processing unit and display the signal waveform;
a signal source: configured to provide a front-end radio frequency input signal to a radio frequency channel processing unit;
an upper computer: the upper computer is set as a computer, is connected with the frequency spectrograph and/or the signal source through a GPIB (general purpose interface bus) line, is in SPI (serial peripheral interface) communication or RS232 communication with the digital processing unit, provides frequency modulation information and a control value of the numerical control attenuator for the radio frequency channel processing unit, and acquires a waveform index of an output waveform of the frequency spectrograph.
Fig. 3 shows a transceiver module, which mainly uses a 74VHC245 series 5.5V eight-channel bidirectional transceiver, TSSOP-20 with 3-state output and model 74VHC245MTC, and is used for converting frequency and attenuation information into an electrical signal in a signal source and transmitting the electrical signal to a radio frequency channel processing unit.
Fig. 4 is an FPGA chip module, which mainly uses an FPGA chip with a model of XC3S1000-4FT256C, and is mainly used as a digital processing unit to connect an upper computer and a radio frequency channel processing unit.
FIG. 5 shows a memory module mainly using a chip memory chip model XCF04S TSSOP20, and FIG. 6 shows a circuit of a programmable ROM model AT24C256 and a printed circuit connector model JL24-30 TKY.
Fig. 3-6 mainly show a connection circuit diagram of the digital processing unit and the signal source and rf channel processing unit, and it should be noted that this embodiment is not a circuit limitation to the present invention.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (6)
1. The utility model provides a flatness integrated test system in broadband communication receiver radio frequency channel band, includes digital processing unit, radio frequency channel processing unit, frequency spectrograph, signal source and host computer, its characterized in that:
a digital processing unit: the digital control attenuator and the frequency conversion unit are connected with the upper computer and the radio frequency channel processing unit and used for analyzing and receiving a control command of the upper computer and controlling the radio frequency channel processing unit;
a radio frequency channel processing unit: outputting corresponding signal waveforms according to the received control instruction of the digital processing unit;
a frequency spectrograph: configured to receive a signal waveform of the radio frequency channel processing unit and display the signal waveform;
a signal source: configured to provide a front-end radio frequency input signal to a radio frequency channel processing unit;
an upper computer: and providing frequency modulation information and a control value of the numerical control attenuator for the radio frequency channel processing unit, and acquiring a waveform index of an output waveform of the frequency spectrograph.
2. The system of claim 1, wherein the system comprises: the radio frequency channel processing unit is a radio frequency channel of the broadband communication receiver, the input of the radio frequency channel processing unit is radio frequency, and the output of the radio frequency channel processing unit is radio frequency or intermediate frequency.
3. The system of claim 1, wherein the system comprises: the digital processing unit adopts an FPGA programmable logic device.
4. The system of claim 1, wherein the system comprises: and the upper computer is connected with the frequency spectrograph and/or the signal source through a GPIB (general purpose interface bus) line.
5. The system of claim 1, wherein the system comprises: the upper computer is a computer.
6. The system of claim 1, wherein the system comprises: and the upper computer and the digital processing unit are communicated in a SPI communication mode or a RS232 communication mode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113391849A (en) * | 2021-05-13 | 2021-09-14 | 上海联影医疗科技股份有限公司 | Radio frequency parameter debugging method, radio frequency parameter display method, radio frequency parameter debugging device and magnetic resonance imaging system |
| US11874354B2 (en) | 2021-05-13 | 2024-01-16 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for magnetic resonance imaging |
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2020
- 2020-03-30 CN CN202020433895.9U patent/CN211791529U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113391849A (en) * | 2021-05-13 | 2021-09-14 | 上海联影医疗科技股份有限公司 | Radio frequency parameter debugging method, radio frequency parameter display method, radio frequency parameter debugging device and magnetic resonance imaging system |
| CN113391849B (en) * | 2021-05-13 | 2023-09-22 | 上海联影医疗科技股份有限公司 | Radio frequency parameter debugging method, display method, device and magnetic resonance imaging system |
| US11874354B2 (en) | 2021-05-13 | 2024-01-16 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for magnetic resonance imaging |
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