CN110031811B - Multichannel broadband signal coherent characteristic rapid calibration system - Google Patents
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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Abstract
The invention discloses a rapid on-line calibration system for the coherent characteristics of multichannel broadband signals, and aims to solve the problem of coherent characteristic calibration of multichannel, high-precision, broadband and large dynamic coherent signals. The invention is realized by the following technical scheme: the clock/trigger distribution module provides a down-conversion clock, an acquisition clock and a trigger signal for the radio frequency front end & signal conditioning module and the multi-channel data acquisition & signal processing board card through frequency division/frequency multiplication phase locking; through the combination of a plurality of groups of radio frequency switches, the measured coherent signals which are rapidly traversed and measured are switched and output to a radio frequency front end and a signal conditioning module in a time-sharing way, and the coherent characteristics are measured after the radio frequency signals are subjected to frequency conversion attenuation or amplification for many times; the method comprises the steps of completing calibration of phase inconsistency of self amplitude channels and reporting of measured system coherent characteristics and calibration values through a state machine realized by built-in software, and realizing online rapid calibration of the coherent characteristics of multi-channel broadband signals by combining a signal rapid switching channel and a flow line calibration flow based on the state machine.
Description
Technical Field
The invention relates to a metering and calibrating device for phase parameters in the field of radio metering, in particular to a system mainly used for realizing rapid calibration of the coherent characteristics of multi-channel, high-precision, wide-band and large-dynamic coherent signals.
Background
Under the background of rapid development of technologies such as communication and radar, especially in research, development and production processes of electronic product devices such as multichannel communication, multiple-input multiple-output (MIMO) communication, direction-finding positioning radar and phased array radar, the requirements on multichannel communication devices, especially multichannel signal generators, are increasing. The signal source is required to generate a plurality of channels with the same or different signal types at the same time, and the signal source is required to have a certain phase relation among the channels, and is mainly used for testing the coherent characteristics among the channels output by products such as communication and radar and testing the performance of the products such as multi-channel communication and radar. In these application scenarios, the conventional signal generator cannot meet the test requirements. In order to ensure the accuracy and reliability of indexes such as direction finding, positioning and the like of a multi-receiver system tested by a multi-channel coherent target simulator, a large amount of coherent characteristics of the multi-channel coherent target simulator used for testing the multi-receiver system, namely phase consistency among channels within a certain time range, obvious change caused by environmental temperature influence, calibration needs to be completed in a short time, and the coherent characteristics need to be calibrated and traced to the source. Because the multi-channel coherent target simulator has dozens of channel outputs (more channels), the inter-channel phase consistency is less than 1 degree (high coherent precision), the highest frequency is 20GHz (wide frequency range) and the minimum signal is-60 dBm (large dynamic), the existing calibration system based on the universal instrument (which is built through an oscilloscope, a network divider or a digital acquisition) cannot realize the quick calibration of the high-precision coherent characteristics of the dozens of channels with lower cost, and the calibration system cannot trace the source and the tracing chain is incomplete. The phase-coherent characteristic calibration system based on the oscilloscope is limited by ADC digits and has high noise per se, small test dynamic range and low phase measurement precision. The test system based on the high-end vector network branch is limited in that a plurality of vector networks cannot share a local oscillator and can only support the calibration of the coherent characteristics of a 4-channel coherent target simulator at most when the calibration requirement that the phase consistency among channels is less than 1 degree is met. Although the calibration system based on a plurality of data acquisition, down converters and intermediate frequency conditioning has the advantages that the precision can meet the requirement, and multichannel coherent reception is realized by stacking instruments, along with the increase of the number of channels of a target simulator, the system has high expansion cost and large volume, and the calibration system is not designed in a measurable mode, and can only utilize a multichannel coherent signal generator with higher precision or carry out power division on a single-channel signal to generate coherent signals for tracing.
The existing multi-channel high-precision coherent characteristic test system cannot measure due to the lack of a coherent signal generator with higher precision and power dividers of dozens of channels with good channel consistency, so that the traceability chain of multi-channel high-precision coherent characteristic calibration is incomplete.
Disclosure of Invention
The invention aims to provide a multichannel broadband signal coherent characteristic rapid online calibration system with high precision, easy expansion, low cost, rapid calibration and good phase consistency aiming at the defects of the prior art, so as to solve the problem of coherent characteristic calibration of a multichannel coherent target simulator applied to the field of radar for testing a multi-receiver system at present and solve the problem of coherent characteristic calibration of relevant multichannel, high precision, broadband and large dynamic coherent signals in other fields.
The above object of the present invention can be achieved by the following technical solutions: a multi-channel broadband signal coherent characteristic rapid online calibration system comprises: the system comprises a radio frequency switch module, a signal fast switching channel, a radio frequency front end and signal conditioning module, a multi-channel data acquisition and signal processing board card and a clock/trigger distribution module which are interconnected with an industrial personal computer through an Ethernet, and is characterized in that the clock/trigger distribution module converts a high-stability crystal oscillator into a high-stability 10MHz output through frequency division/frequency multiplication phase locking, provides a down-conversion clock, an acquisition clock and a trigger signal for the radio frequency front end and signal conditioning module and the multi-channel data acquisition and signal processing board card, and realizes the synchronization of the down-conversion clock, the acquisition clock and the trigger; through the combination of a plurality of groups of radio frequency switches, the signal fast switching channel switches and outputs the rapidly traversed and measured channel coherent radio frequency signals to a radio frequency front end & signal conditioning module in a time-sharing manner, converts the radio frequency signals to intermediate frequency for many times, attenuates or amplifies the intermediate frequency signals, and sends the intermediate frequency signals to a multi-channel data acquisition & signal processing board card for measuring the coherent characteristics; the industrial personal computer completes the calibration of the phase inconsistency of the amplitude channel of the industrial personal computer and the measurement of the coherent characteristics of the system to be measured through a state machine which is realized by built-in software, and completes the report of calibration values through the Ethernet, and combines a signal fast switching path and a flow line calibration flow based on the state machine to realize the online fast calibration of the coherent characteristics of the multichannel broadband signals.
Compared with the prior art, the invention has the following beneficial effects:
easy expansion and low cost. The rapid switching channel outputs the tested multichannel coherent signals in a time-sharing manner through the combination of a plurality of groups of radio frequency switches, realizes rapid traversal measurement of the coherent characteristics of the multichannel signals by a small number of acquisition and measurement ports, realizes rapid switching of the tested signals, reduces the measurement cost, only needs to replace the signal rapid switching channel when a calibration system needs to support the test of more channels, increases the expansion capability of the channel, and has easy expansion and low expansion cost. The defects that the prior art depends on the stacking of hardware and is high in cost are overcome.
The phase consistency is good, the calibration is fast, and the precision is high. The invention adopts the design of radio frequency front end down-conversion common local oscillator, realizes the measurement of the coherent characteristics by the down-conversion clock, the synchronous design of the acquisition clock and the trigger and the frequency domain phase measurement, keeps the coherent characteristics of the measured signal and provides guarantee for realizing the high-precision measurement of the coherent characteristics; the completeness of the traceability chain is ensured by adopting the design of the metering property. The radio frequency front end, the signal conditioning module and the multi-channel number adopt independent parallel channel design, and a signal fast switching path and a state machine-based assembly line calibration flow are combined to realize fast calibration of multi-channel coherent characteristics and further provide guarantee for high-precision calibration of the coherent characteristics; the phase-coherent measurement precision of the calibration system is improved to 0.5 degrees, which is higher than that of the existing phase-coherent test system (the highest precision is 1 degree).
And the traceability chain is complete. The completeness of the traceability chain is ensured by adopting the design of the metering property. The defects that the source tracing chain of multi-channel high-precision coherent characteristic calibration is incomplete due to the fact that the existing multi-channel high-precision coherent characteristic test system cannot measure due to the lack of a higher-precision coherent signal generator with higher precision and a power divider with dozens of channels with good channel consistency are avoided. The invention adopts the concept of medium frequency traceability to carry out a measurable design, is arranged in a multi-channel data acquisition and signal processing board card case, is internally provided with a detachable phase calibration box based on an air line, respectively measures the phase of each channel relative to a reference channel by replacing two channels of the air line and the cable in the phase calibration box, and traces the phase consistency of each channel to the phase consistency of the air line of the phase calibration box and the two channels of the cable, and traces the phase consistency of the two channels of the air line and the cable to a national standard, thereby realizing the tracing of the coherent characteristic of a calibration system and providing guarantee for realizing a complete tracing chain of a multi-channel coherent target simulator. The method solves the problem of the phase-coherent characteristic calibration of the multi-channel phase-coherent target simulator applied to the field of radar for testing a multi-receiver system at present, and can solve the problem of the phase-coherent characteristic calibration of relevant multi-channel, high-precision, wide-band and large-dynamic phase-coherent signals in other fields.
The task of the invention is not only the requirement of daily metrological verification and quantity value transmission work, but also the important guarantee of system engineering to the common measurement problem of the multi-channel coherent characteristic index test.
Drawings
The method is further explained below with reference to the figures and examples.
FIG. 1 is a schematic diagram of a multi-channel wide-band signal coherent characteristic fast online calibration system according to the present invention.
Fig. 2 is a schematic diagram of the fast switching channel principle of the signal of fig. 1.
Fig. 3 is a schematic circuit diagram of the rf front end & signal conditioning module of fig. 1.
Fig. 4 is a schematic diagram of a built-in frequency domain phase measurement process of the signal processing board card of fig. 1.
Fig. 5 is a schematic diagram of an embodiment of a built-in state machine of the industrial personal computer in fig. 1.
FIG. 6 is a flow diagram of a fast calibration system for measuring coherent characteristics of a multi-channel wideband signal.
Detailed Description
See fig. 1. In a preferred embodiment described below, a system for fast online calibration of coherent characteristics of a multi-channel wideband signal comprises: the system comprises a radio frequency switch module signal fast switching channel, a radio frequency front end and signal conditioning module, a multi-channel data acquisition and signal processing board card and a clock/trigger distribution module which are connected with an industrial personal computer through Ethernet, wherein a detachable phase calibration box based on an air wire is arranged in a case of the multi-channel data acquisition and signal processing board card, the phase calibration box consists of the air wire and a cable, and two selectable paths of the air wire and the cable are formed for signals through a switch. And respectively measuring the phase of each passage relative to the reference passage by replacing the two passages of the air line and the cable in the phase calibration box, and tracing the phase consistency of each channel to the phase consistency of the two passages of the air line and the cable of the phase calibration box. The clock/trigger distribution module converts the high-stability crystal oscillator into high-stability 10MHz output through frequency division/frequency multiplication phase locking, provides a down-conversion clock, an acquisition clock and a trigger signal for the radio frequency front end and signal conditioning module and the multi-channel data acquisition and signal processing board card, and realizes the synchronization of the down-conversion clock, the acquisition clock and the trigger; the signal fast switching channel switches and outputs the measured phase reference signals which are rapidly traversed and measured to a radio frequency front end & signal conditioning module in a time-sharing way through the combination of a plurality of groups of radio frequency switches, converts the radio frequency signals to intermediate frequency for many times, attenuates or amplifies the intermediate frequency signals, and sends the intermediate frequency signals to a multi-channel data acquisition & signal processing board card for measuring the phase reference characteristics; the industrial personal computer completes calibration of phase inconsistency of self amplitude channels and measurement of coherent characteristics of a system to be measured through a state machine which is realized through built-in software, reports of calibration values through Ethernet, and combines a signal fast switching channel and a flow line calibration flow based on the state machine to realize online fast calibration of the coherent characteristics of multi-channel broadband signals. And carrying out the quantifiable design on the calibration system, inserting a detachable calibration box based on an air line and a cable in front of the multi-channel data acquisition and signal processing board card channel 1, respectively replacing two channels of the air line and the cable in the phase calibration box during calibration, measuring the phase of each channel relative to a reference channel, tracing the phase consistency of each channel to the phase consistency of the air line of the phase calibration box and the two channels of the cable, and tracing the phase consistency of the two channels of the air line and the cable to a national standard, thereby realizing the tracing of the coherent characteristics of the calibration system.
The process of signal selection, down conversion, conditioning, acquisition, storage, phase consistency measurement and measurement reporting of the measured channel coherent radio frequency signal from the signal fast switching channel to the multi-channel data acquisition and signal processing board card is completed by a production line state machine realized on an industrial personal computer platform through Ethernet control. The down-conversion clock of the radio frequency front end & signal conditioning module, the acquisition clock of the multi-channel data acquisition & signal processing board card and the trigger are provided by the clock/trigger distribution module in a unified way.
The measured coherent signal may be a 28-channel coherent radio frequency signal.
The 28-channel coherent radio-frequency signals to be tested are converted into 4-channel radio-frequency signals to be output through signal fast switching channels in a time-sharing mode, four-channel radio-frequency signals are input to a radio-frequency front end & signal conditioning module through an equal-length phase-stable cable, the four-channel radio-frequency signals are subjected to parallel independent down-conversion, attenuation and amplification conditioning through the radio-frequency front end & signal conditioning module, level four-channel intermediate-frequency signals are output, the four-channel intermediate-frequency signals are input to a multi-channel data acquisition & signal processing board card through the equal-length phase-stable cable, and a phase calibration box is inserted into the multi-channel data acquisition & signal processing board card before the channel 1 of the multi-channel data acquisition & signal processing board card is input. The phase calibration box is inserted between the input 1 channels of the multi-channel data acquisition, the cable access is used by the phase calibration box during the use of daily test, and the air line access is used by the phase calibration box only when the calibration system is traced. And after the multi-channel data acquisition and signal processing board card finishes the parallel independent acquisition and storage of the four-channel intermediate frequency signals, the FFT conversion digital signal processing is realized, and finally the phase consistency measurement is finished.
In the embodiment depicted in fig. 2, the fast switching of the channels by the signals includes: the method comprises the steps of providing a 28-channel input-to-4-channel output switching capability, and 1-6 single-pole 5-throw switch groups with the frequency range of 10 MHz-20 GHz, wherein an input channel 1 is a reference signal channel through output, the rest 27 input channel signals are divided into two stages by 6 single-pole 5-throw switches under the control of a control signal to complete the selective output of 3 channel signals, the combination of 1 single-pole 5-throw switch and 1 single-pole 5-throw switch realizes the switching function from 9 input to 1 output, and 3 groups of signal switching paths from 9 input to 1 output are realized. The switch toggle of the 6 single-pole 5-throw switches is controlled by a control signal from an industrial personal computer.
In the embodiment depicted in fig. 3, the rf front end & signal conditioning module comprises: the system comprises a broadband frequency unit, a frequency conversion unit and a signal conditioning unit, wherein the broadband frequency unit comprises a local vibration source generating module and a one-to-four power divider, the frequency conversion unit comprises a four-channel input frequency conversion module and a four-channel output signal conditioning unit, the frequency conversion unit comprises four down conversion modules with the same structure, and the signal conditioning unit comprises four signal conditioning modules with the same structure. The clock/trigger distribution module inputs the down-conversion clock to a local oscillation source generation module of the broadband frequency unit, the broadband sine wave signal with the frequency range of 1.3 GHz-20 GHz is output after the local oscillation source generation module, and then the broadband sine signal is divided into four local oscillation signals by a one-to-four power divider and is output to the frequency conversion unit, so that the common local oscillation of frequency conversion is realized. The four channels of input radio frequency signals of 10 MHz-20 GHz and 0 dBm-60 dBm are respectively subjected to independent parallel down-conversion by four down-conversion modules of a frequency conversion unit, four paths of intermediate frequency signals of 10 MHz-600 MHz and 0 dBm-60 dBm are output after frequency conversion, and the four paths of intermediate frequency signals of 10 MHz-600 MHz and 0 dBm-60 dBm are independently subjected to parallel signal conditioning by four signal conditioning modules of a signal conditioning unit to form four paths of signals of 10 MHz-600 MHz and 0dBm for output.
In the embodiment depicted in fig. 4, the signal processing board multiplies the measured signal by using a frequency domain phase measurement algorithm; and (4) truncating conjugate data, performing frequency spectrum correction after FFT conversion, extracting phase information at the maximum spectral value by searching the maximum spectral value point, acquiring a phase measurement value, and completing phase measurement.
In the embodiment illustrated in fig. 5, the measurement flow of phase consistency of a channel measured by the multichannel broadband signal coherent characteristic fast calibration system is down-conversion, conditioning, acquisition, storage, measurement and reporting in sequence, where the down-conversion, conditioning, acquisition and storage are implemented by hardware, and the measurement and reporting are implemented by software, which takes time t. The phase consistency measurement of the 28 channels adopts a pipeline structure, the phase consistency measurement of the channels 2-28 takes 5t. Firstly, at the time 0, the signal fast switching channel firstly selects the channels 2, 3 and 4 and the channel 1 to output, and starts to measure the phase consistency of the channels 2, 3 and 4; when the phase consistency measurement of the channels 2, 3 and 4 enters a storage process, signals are rapidly switched to select the channels 5, 6, 7 and 1 to be output, and the phase consistency of the channels 5, 6 and 7 starts to be measured; when the phase consistency measurement of the channels 5, 6 and 7 enters a storage process, the phase consistency measurement of the channels 2, 3 and 4 is reported, signals are rapidly switched to the channel selection channels 8, 9, 10 and 1 for output, and the phase consistency of the channels 8, 9 and 10 starts to be measured; when the phase consistency measurement of the channels 8, 9 and 10 enters a storage process, the phase consistency measurement of the channels 5, 6 and 7 is reported, signals are rapidly switched to the channel selection channels 11, 12 and 13 and the channel 1 to be output, and the phase consistency of the channels 11, 12 and 13 starts to be measured; when the channel 11, 12, 13 phase consistency measurement enters the storage process, the channel 8, 9, 10 phase consistency measurement is reported, 14, 15, 16 and channel 1 output, and the phase consistency of the channel 14, 15, 16 begins to be measured; when the phase consistency measurement of the channels 14, 15 and 16 enters the storage process, the phase consistency measurement of the channels 11, 12 and 13 is reported, signals are rapidly switched to the channel selection channels 17, 18 and 19 and the channel 1 to be output, and the phase consistency of the channels 17, 18 and 19 starts to be measured; when the phase consistency measurement of the channels 17, 18 and 19 enters the storage process, the phase consistency measurement of the channels 14, 15 and 16 is reported, signals are rapidly switched to the channel selection channels 20, 21 and 22 and the channel 1 to be output, and the phase consistency of the channels 20, 21 and 22 starts to be measured; when the phase consistency measurement of the channels 20, 21 and 22 enters the storage process, the phase consistency measurement of the channels 17, 18 and 19 is reported, signals are rapidly switched to the channel selection channels 23, 24 and 25 and the channel 1 to be output, and the phase consistency of the channels 23, 24 and 25 is measured; when the channel 23, 24, 25 phase consistency measurement enters the storage process, the channel 20, 21, 22 phase consistency measurement is reported, the signal is switched to the channel selection channel 26, 27, 28 and the channel 1 output quickly, and the phase consistency of the channel 26, 27, 28 begins to be measured; when the channel 26, 27, 28 phase consistency measurement enters the storage process, the channel 23, 24, 25 phase consistency measurement is reported; at the time of 5t, reporting of phase consistency measurement of the channels 26, 27 and 28 is completed, and measurement of the 28-channel phase consistency characteristics is completed.
In the embodiment illustrated in fig. 6, the procedure of measuring the coherent characteristic of the multi-channel wideband signal to calibrate the system quickly sequentially includes: step 1, taking out a phase calibration box from a case of a multi-channel data acquisition and signal processing board card of a calibration system, sending the phase calibration box to a China measurement institute, and tracing the phase difference delta phi 0 of an air line channel relative to a cable channel; step 2, after tracing is completed, the phase calibration box is connected into the chassis of the multi-channel data acquisition and signal processing board card again; step 3, connecting a signal source into an input 1 channel, an x +1 channel and an x +2 channel of the calibration system through a power divider which divides the signal source into four channels, wherein x =2, and placing a phase calibration box in a cable channel state; step 4, measuring the phase phi i of the x channel, the x +1 channel and the x +2 channel to the reference channel 1; step 5, placing the phase calibration box in an air line channel state, and measuring the phase phi n of the x, x +1 and x +2 channels to the reference channel 1; step 6, comparing the difference between phi n and phi i to obtain delta phi m, wherein the standard value of the delta phi m is delta phi 0, and therefore phase consistency tracing of x, x +1 and x +2 channels is achieved; step 7, judging that x is greater than 28; if yes, ending the process, and completing the measurement tracing of the multi-channel broadband signal coherent characteristic quick calibration system; step 7 if "no", go to step 8 — keep input 1 channel connection unchanged, x = x +2, change connection to x, x +1, x +2 channel, x = x +2. Placing the phase calibration box in a cable channel state; and after the step 8 is finished, circulating to the step 4.
However, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed manner, including employing various features disclosed herein in combination with features that may not be explicitly disclosed herein. Various changes and modifications in the above-described structures and materials, including combinations of features disclosed herein, which are individually or collectively claimed herein, may be made by those skilled in the art, and other combinations of features will become apparent to those skilled in the art upon examination of the following drawings. Such variations and/or combinations are within the skill of the art to which the invention pertains and are within the scope of the following claims.
Claims (8)
1. A multi-channel broadband signal coherent characteristic fast calibration system comprises: the system comprises a radio frequency switch module, a signal fast switching channel, a radio frequency front end and signal conditioning module, a multi-channel data acquisition and signal processing board card and a clock/trigger distribution module which are interconnected with an industrial personal computer through an Ethernet, and is characterized in that the clock/trigger distribution module converts a high-stability crystal oscillator into a high-stability 10MHz output through frequency division/frequency multiplication phase locking, provides a down-conversion clock, an acquisition clock and a trigger signal for the radio frequency front end and signal conditioning module and the multi-channel data acquisition and signal processing board card, and realizes the synchronization of the down-conversion clock, the acquisition clock and the trigger; through the combination of a plurality of groups of radio frequency switches, the signal fast switching channel switches the rapidly traversed and measured coherent radio frequency signals of the channel to be measured to a radio frequency front end & signal conditioning module in a time-sharing manner, converts the radio frequency signals to intermediate frequency for multiple times, attenuates or amplifies the intermediate frequency signals, and sends the intermediate frequency signals to a multi-channel data acquisition & signal processing board card to measure coherent characteristics; the industrial personal computer completes the calibration of the phase inconsistency of the amplitude channel of the industrial personal computer and the measurement of the coherent characteristics of the system to be measured through a state machine realized by built-in software, and completes the report of the calibration value through the Ethernet; combining a signal fast switching channel and a flow line calibration flow based on a state machine to realize online fast calibration of multi-channel broadband signal coherent characteristics, wherein at the time of 0, the signal fast switching channel firstly selects channels 2, 3 and 4 and a channel 1 to output, and starts to measure the phase consistency of the channels 2, 3 and 4; when the phase consistency measurement of the channels 2, 3 and 4 enters a storage process, signals are rapidly switched to select the channels 5, 6, 7 and 1 to output, and the phase consistency of the channels 5, 6 and 7 starts to be measured; at the time of t, when the phase consistency measurement of the channels 5, 6 and 7 enters a storage process, the phase consistency measurement of the channels 2, 3 and 4 is reported, signals are rapidly switched to the channel selection channels 8, 9, 10 and 1 for output, and the phase consistency of the channels 8, 9 and 10 starts to be measured; when the phase consistency measurement of the channels 8, 9 and 10 enters a storage process, the phase consistency measurement of the channels 5, 6 and 7 is reported, signals are rapidly switched to the channel selection channels 11, 12 and 13 and the channel 1 to be output, and the phase consistency of the channels 11, 12 and 13 starts to be measured; at the time of 2t, when the phase consistency measurement of the channels 11, 12 and 13 enters a storage process, the phase consistency measurement of the channels 8, 9 and 10 is reported, 14, 15 and 16 and the channel 1 are output, and the phase consistency of the channels 14, 15 and 16 starts to be measured; when the phase consistency measurement of the channels 14, 15 and 16 enters the storage process, the phase consistency measurement of the channels 11, 12 and 13 is reported, signals are rapidly switched to the channel selection channels 17, 18 and 19 and the channel 1 to be output, and the phase consistency of the channels 17, 18 and 19 starts to be measured; at the time of 3t, when the phase consistency measurement of the channels 17, 18 and 19 enters the storage process, the phase consistency measurement of the channels 14, 15 and 16 is reported, signals are rapidly switched to the channel selection channels 20, 21 and 22 and the channel 1 to output, and the phase consistency of the channels 20, 21 and 22 starts to be measured; when the phase consistency measurement of the channels 20, 21 and 22 enters the storage process, the phase consistency measurement of the channels 17, 18 and 19 is reported, signals are rapidly switched to the channel selection channels 23, 24 and 25 and the channel 1 to be output, and the phase consistency of the channels 23, 24 and 25 is measured; at the 4t moment, when the phase consistency measurement of the channels 23, 24 and 25 enters a storage process, the phase consistency measurement of the channels 20, 21 and 22 is reported, signals are rapidly switched to the channel to select the output of the channels 26, 27 and 28 and the channel 1, and the phase consistency of the channels 26, 27 and 28 starts to be measured; when the channel 26, 27, 28 phase consistency measurement enters the storage process, the channel 23, 24, 25 phase consistency measurement is reported; at the time of 5t, reporting is finished when the phase consistency measurement of the channels 26, 27 and 28 is finished, and the phase consistency measurement of the channel 28 is finished; a signal source is accessed to an input 1 channel and x, x +1 and x +2 channels of a calibration system through a four-in-one power divider, wherein x =2, and a phase calibration box is placed in a cable channel state; measuring the phase phi i of the x, x +1 and x +2 channels to the reference channel 1; the phase calibration box is placed in an air line channel state, and the phase phi n of the x channel, the x +1 channel and the x +2 channel to the reference channel 1 is measured; comparing the difference between phi n and phi i to obtain delta phi m, wherein the standard value of the delta phi m is delta phi 0, and the delta phi 0 is the phase difference of the air line channel of the phase calibration box relative to the cable channel calibrated by the Chinese measurement institute, so that the phase consistency tracing of the x channel, the x +1 channel and the x +2 channel is realized; then judging that x is greater than 28; if yes, finishing the process and completing the measurement tracing; if 'no', keeping the input 1 channel connection unchanged, x = x +2, replacing the connection to the x, x +1, x +2 channels, placing the phase calibration box in the cable channel state, and continuing to measure the phase Φ i of the x, x +1, x +2 channels to the reference channel 1.
2. The multi-channel wide-band signal coherent characteristic fast calibration system of claim 1, wherein: the processes of signal selection, down conversion, conditioning, acquisition, storage, phase consistency measurement and measurement reporting which are experienced by the multi-channel data acquisition and signal processing board card from the signal fast switching channel are completed by a production line state machine realized on an industrial personal computer platform through Ethernet control.
3. The system for fast calibration of coherent characteristics of a multi-channel wideband signal according to claim 2, wherein: the down-conversion clock of the radio frequency front end & signal conditioning module, the acquisition clock of the multi-channel data acquisition & signal processing board card and the trigger are provided by the clock/trigger distribution module in a unified way.
4. The multi-channel wide-band signal coherent characteristic fast calibration system of claim 3, wherein: the tested coherent signal is a 28-channel coherent radio frequency signal, the 28-channel coherent radio frequency signal is converted into a four-channel radio frequency signal by signal fast switching channels in a time-sharing mode and is output, and the four-channel radio frequency signal is input to the radio frequency front end & signal conditioning module through an equal-length phase-stable cable.
5. The multi-channel wide-band signal coherent characteristic fast calibration system of claim 4, wherein: the radio frequency front end & signal conditioning module outputs level four-channel intermediate frequency signals after parallel independent down-conversion, attenuation and amplification conditioning of the four-channel radio frequency signals, the four-channel intermediate frequency signals are input to the multi-channel data acquisition & signal processing board card through an equal-length phase-stable cable, and the multi-channel data acquisition & signal processing board card channel 1 is inserted into the phase calibration box before being input.
6. The multi-channel wide-band signal coherent characteristic fast calibration system of claim 5, wherein: the phase calibration box is inserted between the input 1 channels of the multi-channel data acquisition, the cable access is used by the phase calibration box during the use of daily test, and the air line access is used by the phase calibration box only when the calibration system is traced.
7. The multi-channel wide-band signal coherent characteristic fast calibration system of claim 1, wherein: and after the multi-channel data acquisition and signal processing board card completes the parallel independent acquisition and storage of the four-channel intermediate frequency signals, the fast Fourier transform FFT digital signal processing is realized, and finally the phase consistency measurement is completed.
8. The system of claim 1, wherein: the radio frequency switch module signal fast switching channel includes: the switch circuit comprises 1-6 single-pole 5-throw switch groups which provide 28-channel input to 4-channel output switching capability and have a frequency range of 10 MHz-20 GHz, wherein an input channel 1 is a reference signal channel through output, the rest 27 input channel signals are selected and output by 6 single-pole 5-throw switches in two stages under the control of a control signal, the 1 single-pole 5-throw switch and the 1 single-pole 5-throw switch are combined to realize the switching function from 9 input to 1 output, the signal switching paths from 3 groups of 9 input to 1 output are realized totally, and the switches of the 6 single-pole 5-throw switches are toggled and controlled by the control signal from an industrial personal computer.
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| CN113009436B (en) * | 2021-02-24 | 2023-05-09 | 中国电子科技集团公司第十研究所 | Spatial angular position parameter calibration method |
| CN113406467B (en) * | 2021-06-01 | 2022-06-24 | 长江存储科技有限责任公司 | Auxiliary measuring circuit, measuring circuit and semiconductor device electric signal measuring method |
| CN116868079B (en) * | 2022-11-10 | 2024-02-27 | 长沙天恒测控技术有限公司 | Zero phase calibration method, computer device and storage medium |
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