CN211402708U - Platform for realizing amplitude, phase and time delay consistency among multiple radio frequency channels - Google Patents
Platform for realizing amplitude, phase and time delay consistency among multiple radio frequency channels Download PDFInfo
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- CN211402708U CN211402708U CN201922088883.7U CN201922088883U CN211402708U CN 211402708 U CN211402708 U CN 211402708U CN 201922088883 U CN201922088883 U CN 201922088883U CN 211402708 U CN211402708 U CN 211402708U
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Abstract
The utility model discloses a platform for realizing the consistency of amplitude, phase and time delay among multiple radio frequency channels, which comprises a channel calibration device and a signal processing device which are electrically connected with each other; the channel calibration device is used for outputting amplitude, phase and time delay characteristic difference signals among the channel calibration signals to the signal processing device; the signal processing device is used for receiving the amplitude, phase and time delay characteristic difference signals and outputting channel calibration signals, and the channel calibration signals are respectively transmitted to the channel calibration device and the receiving antenna. The advantages are that: parameters such as the angle, the distance, the direction and the like of a signal reaching an antenna can be accurately simulated through modulating the amplitude, the phase and the time delay of the signal.
Description
Technical Field
The utility model relates to a platform for realizing range, phase place and time delay uniformity between many radio frequency channels belongs to electron technical field.
Background
In the process of simulating the arrival of the injection radar signal at the receiving antenna, the relation of the arrival of the multi-channel radio frequency signal at different receiving antennas is simulated by modulating the amplitude, the phase and the time delay of the multi-channel radio frequency signal. Because path errors exist among channels, particularly for high-frequency signals (more than 10 GHz) with the wavelength less than 30mm, the phase difference caused by the path errors is particularly obvious, and therefore a device or a platform capable of ensuring that the consistency relationship among the amplitude, the phase and the time delay among the signals is met is urgently needed.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art's defect, provide a platform that is used for realizing range, phase place and time delay uniformity between many radio frequency channels.
In order to solve the above technical problem, the present invention provides a platform for realizing consistency of amplitude, phase and time delay among multiple radio frequency channels, comprising a channel calibration device and a signal processing device electrically connected to each other;
the channel calibration device is used for outputting amplitude, phase and time delay characteristic difference signals among the channel calibration signals to the signal processing device;
the signal processing device is used for receiving the amplitude, phase and time delay characteristic difference signals and outputting channel calibration signals, and the channel calibration signals are respectively transmitted to the channel calibration device and the receiving antenna.
Further, the channel calibration device comprises a plurality of SP2T switches, a plurality of down-conversion modules, a frequency synthesis module and a signal acquisition board card;
the two-time signal selection module is composed of a plurality of SP2T switches, each SP2T switch in the first signal selection module receives two paths of channel calibration signals or one path of channel calibration signal and one path of self-checking signal, one path of signal is selectively output to the second signal selection module, the second signal selection module receives the signals output by the two paths of first signal selection modules and then outputs one path of signal to one down-conversion module, the down-conversion module also receives the local oscillator signal of the frequency synthesis module, the down-conversion module outputs the signals after frequency conversion to the ADC sampling port of the signal acquisition board card, the frequency synthesis module outputs the self-checking signal to the first signal selection module, and outputting a clock signal to the signal acquisition board card, and outputting amplitude, phase and time delay characteristic difference signals among the calibration signals of each channel to the signal processing device through a communication port of the signal acquisition board card.
Furthermore, the signal processing device comprises a plurality of intermediate frequency signal processing board cards, a real-time processing board card, an up-conversion module and a radio frequency signal distribution module;
the real-time processing board card is in communication connection with the control computer and the channel calibration device, the real-time processing board card is connected with the intermediate frequency signal processing board card through a cPCI bus, the intermediate frequency signal processing board card is used for receiving an intermediate frequency radar transmitting signal and outputting a modulated signal, the up-conversion module up-converts the modulated signal and outputs a plurality of channel calibration signals through the radio frequency signal distribution module, each channel calibration signal is divided into two channels, one channel is input to the channel calibration device, and the other channel is input to the receiving antenna.
Furthermore, the device also comprises a power supply which is used for supplying power to the platform.
Furthermore, in order to reduce the inherent amplitude phase and time delay difference of two paths of signals after down-conversion caused by the line path difference of the calibration device, the channel calibration signal between the channel calibration device and the signal processing device is transmitted through the incoming line of the radio frequency cable, and the lengths of the radio frequency cables are consistent.
Furthermore, the number of the second signal selection modules is consistent with the number of the down-conversion modules.
The utility model discloses the beneficial effect who reaches:
the utility model discloses an amplitude, the phase place of each channel signal of passageway calibrating device test, time delay characteristic, acquire amplitude, the phase place between each channel signal, time delay characteristic difference, then compensate corresponding amplitude, the phase place in signal processing device, time delay difference value, the difference that makes the signal of channel modulation unit output to each receiving antenna no longer attach the passageway route and lead to, can be accurate through to the modulation of signal amplitude, phase place and time delay come the angle, distance, the position isoparametric that analog signal reachd the antenna.
Drawings
Fig. 1 is a schematic block diagram of the channel calibration device of the present invention;
fig. 2 is a schematic block diagram of the signal processing apparatus of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
A platform for realizing amplitude, phase and time delay consistency among multiple radio frequency channels comprises a channel calibration device and a signal processing device which are electrically connected with each other; the channel calibration device is used for outputting amplitude, phase and time delay characteristic difference signals among the channel calibration signals to the signal processing device; the signal processing device is used for receiving the amplitude, phase and time delay characteristic difference signals and outputting channel calibration signals, and the channel calibration signals are respectively transmitted to the channel calibration device and the receiving antenna.
The amplitude, phase and time delay characteristics of each channel signal are tested through the channel calibration device, the amplitude, phase and time delay characteristic differences among the channel signals are obtained, and then corresponding amplitude, phase and time delay difference values are compensated in the signal processing device, so that the signals output to each receiving antenna by the channel modulation unit are not added with the differences caused by channel paths.
As shown in fig. 1, the channel calibration device includes a plurality of SP2T switches (six channels in the figure need 6), 2 down-conversion modules, 1 frequency synthesis module, 1 signal acquisition board card, and other necessary modules and wires such as a power supply, and its schematic block diagram is shown in fig. 1. The SP2T switch selects signals entering the calibrating device through an alternative relation, the down-conversion module is used for down-converting two selected paths of radio frequency signals (2 GHz-18 GHz) to a range of 250MHz +/-100 MHz so that the signal acquisition board can sample through an ADC (1 GSPS sampling rate), and the frequency synthesis module provides local oscillation signals and a working clock for the down-conversion module and the signal acquisition board card respectively. In addition, in order to reduce the inherent amplitude phase and time delay difference of two paths of signals after down-conversion caused by the line path difference of the calibration device, all the radio frequency cables with the parallel relation need to be strictly and equidistantly controlled. Meanwhile, self-checking calibration is carried out before calibration work to substitute the inherent amplitude phase and time delay difference of the calibration device, and two paths of self-checking signals are generated by the frequency synthesis module. Different calibration channel numbers can be accommodated by increasing or decreasing the number of SP 2T.
As shown in fig. 2, the signal processing apparatus performs amplitude, phase and time delay modulation on a radar signal to be simulated, and includes 6 intermediate frequency signal processing boards (taking 6 channels as an example), 1 real-time processing board, an up-conversion module, a radio frequency signal distribution module, and other necessary modules and connections. The real-time signal processing board card model cPCI-6880 is used for communicating with a control computer (the control computer is a universal PC), a loading software main control interface and a channel calibration device, and sending control information to the intermediate-frequency signal processing board card through a cPCI bus. The intermediate frequency signal processing board card is used for modulating the amplitude, the phase and the time delay of an intermediate frequency radar transmitting signal (750 MHz +/-650 MHz) so as to simulate the characteristics of the amplitude, the phase and the time delay when the signal reaches the multi-azimuth radar receiving antenna. The up-conversion module up-converts the modulated signals and then passes through the radio frequency signal distribution module, each channel is divided into two paths of signals, and one path of signal is used for calibrating the amplitude, phase and time delay characteristics and is fed into the channel calibration device; and the other path is a calibrated using signal and is fed into a receiving antenna analog unit.
The utility model discloses a use does:
the calibration operation of the channel calibration device is started, firstly, two paths of self-checking signals output by the frequency synthesizer are used for calibrating the inherent amplitude phase and time delay difference of the calibration device, and the calibrated value is substituted into the subsequent calibration process to offset the differences. When the channel is formally calibrated, firstly, the radio frequency distribution module in the signal processing device is controlled to output a calibration signal switched to the six channels, and the calibration signal is input into the input of the channel calibration device. A SP2T switch is used for firstly selecting a channel I signal to enter a down-conversion module 1, then selecting a channel IV signal to enter a down-conversion module 2, acquiring the two paths of signal data in a signal acquisition board, comparing the two paths of signal data by taking the channel I as a reference to obtain difference value data of amplitude phase and time delay between the channel IV and the channel I, and finishing a comparison process. Similarly, the change-over switch respectively compares the difference value data of the amplitude phase and the time delay between the channel five or the channel six and the channel one. And then, by taking the channel six as a reference, difference value data of the amplitude phase and the time delay between the channels two to three and the channel one can be obtained by comparison respectively. And the signal acquisition board card transmits the group of difference value data to the signal processing device through the communication port. The above is a calibration procedure for one working frequency, and when the channel signal switches the working frequency, the above process is repeated until the calibration of the whole working frequency band is completed.
The channel calibration device feeds back calibration information (difference value data) to a real-time processing board card in the signal processing device through a communication interface of the signal acquisition board card, the real-time processing board card informs the intermediate frequency signal processing board card of real-time binding of the calibration information of a corresponding channel when amplitude, phase and delay modulation are carried out on the analog signal transmitted by the intermediate frequency radar according to the information, and real-time compensation is carried out on the amplitude, phase and delay characteristics of the channel in the modulation process. And after the frequency of the bound modulation signal is up-converted to a radio frequency band (2 GHz-18 GHz), controlling the output of the radio frequency distribution module to be switched to signals from a channel I to a channel VI, and outputting the signals for a subsequent antenna receiving unit.
In short, the platform obtains the difference values of the amplitude, the phase and the time delay among a plurality of radio frequency channels in a pairwise comparison mode through the channel calibration device, and feeds the difference value information back to the signal processing device through the communication port, so that the intermediate frequency signal processing unit carries out real-time compensation on the difference values during the modulation of the amplitude, the phase and the time delay of signals, a closed loop feedback adjustment is formed, and the consistency of the amplitude, the phase and the time delay of the signals among multiple channels can be flexibly adjusted. It should be noted that cabling between the individual parallel channels should try to maintain equal lengths, reducing excessive deviations in the compensation values.
In the embodiment, the SP2T switch is an SP2TA-HR switch manufactured by Nanjing Changfeng space electronic technology Limited;
in this embodiment, the down-conversion module is a 002-.
In this embodiment, the frequency synthesizer module is a DCYS200400 frequency synthesizer module manufactured by nanjing long-peak aerospace electronics technology ltd.
In this embodiment, the signal acquisition board card is an X5-1GSPS signal acquisition board manufactured by nanjing long-peak space electron technology ltd.
In this embodiment, the real-time processing board card is a cPCI-6880 processing board card produced by the company of luhua technology.
In this embodiment, the intermediate frequency signal processing board card is an X6-3GSPS signal processing board manufactured by nanjing long-peak space electronics technology ltd.
In this embodiment, the up-conversion module is an up-conversion module of 250-.
In this embodiment, the radio frequency signal distribution module is an RFD10 radio frequency signal distribution module manufactured by nanjing long-peak space electronic technology ltd.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (6)
1. A platform for realizing the consistency of amplitude, phase and time delay among multiple radio frequency channels is characterized by comprising a channel calibration device and a signal processing device which are electrically connected with each other;
the channel calibration device is used for outputting amplitude, phase and time delay characteristic difference signals among the channel calibration signals to the signal processing device;
the signal processing device is used for receiving the amplitude, phase and time delay characteristic difference signals and outputting channel calibration signals, and the channel calibration signals are respectively transmitted to the channel calibration device and the receiving antenna.
2. The platform of claim 1, wherein the channel calibration device comprises a plurality of SP2T switches, a plurality of down-conversion modules, a frequency synthesizer module, and a signal acquisition board card;
the two-time signal selection module is composed of a plurality of SP2T switches, each SP2T switch in the first signal selection module receives two paths of channel calibration signals or one path of channel calibration signal and one path of self-checking signal, one path of signal is selectively output to the second signal selection module, the second signal selection module receives the signals output by the two paths of first signal selection modules and then outputs one path of signal to one down-conversion module, the down-conversion module also receives the local oscillator signal of the frequency synthesis module, the down-conversion module outputs the signals after frequency conversion to the ADC sampling port of the signal acquisition board card, the frequency synthesis module outputs the self-checking signal to the first signal selection module, and outputting a clock signal to the signal acquisition board card, and outputting amplitude, phase and time delay characteristic difference signals among the calibration signals of each channel to the signal processing device through a communication port of the signal acquisition board card.
3. The platform of claim 1, wherein the signal processing device comprises a plurality of intermediate frequency signal processing boards, a real-time processing board, an up-conversion module and a radio frequency signal distribution module;
the real-time processing board card is in communication connection with the control computer and the channel calibration device, the real-time processing board card is connected with the intermediate frequency signal processing board card through a cPCI bus, the intermediate frequency signal processing board card is used for receiving an intermediate frequency radar transmitting signal and outputting a modulated signal, the up-conversion module up-converts the modulated signal and outputs a plurality of channel calibration signals through the radio frequency signal distribution module, each channel calibration signal is divided into two channels, one channel is input to the channel calibration device, and the other channel is input to the receiving antenna.
4. The platform of claim 1, further comprising a power source for powering the platform.
5. The platform of claim 1, wherein the channel calibration signal between the channel calibration device and the signal processing device is transmitted via an incoming rf cable, and the lengths of the rf cables are consistent.
6. The platform of claim 2, wherein the number of the second signal selection modules is equal to the number of down-conversion modules.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112511246A (en) * | 2020-12-09 | 2021-03-16 | 南京长峰航天电子科技有限公司 | Multichannel consistency rapid calibration method and system |
| CN113406475A (en) * | 2021-06-09 | 2021-09-17 | 中国电子科技集团公司第二十九研究所 | Multi-microwave-channel radio frequency characteristic consistency testing device, method, equipment and medium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112511246A (en) * | 2020-12-09 | 2021-03-16 | 南京长峰航天电子科技有限公司 | Multichannel consistency rapid calibration method and system |
| CN112511246B (en) * | 2020-12-09 | 2022-07-29 | 南京长峰航天电子科技有限公司 | Multichannel consistency rapid calibration method and system |
| CN113406475A (en) * | 2021-06-09 | 2021-09-17 | 中国电子科技集团公司第二十九研究所 | Multi-microwave-channel radio frequency characteristic consistency testing device, method, equipment and medium |
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