CN114563769B - Method and device for measuring phase nonlinearity of digital phased array receiving channel - Google Patents
Method and device for measuring phase nonlinearity of digital phased array receiving channel Download PDFInfo
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- G—PHYSICS
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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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Abstract
The invention discloses a measuring method and a device for phase nonlinearity of a digital phased array receiving channel, which belongs to the technical field of input signal testing, and comprises the steps of generating a baseband linear frequency modulation signal a, correcting based on the correction signal a, and generating a broadband radio frequency linear frequency modulation signal b and a delay linear frequency modulation signal d; inputting the wide signal b into a digital phased array receiving channel to obtain multi-path baseband I/Q data c; performing cross-correlation operation on the multipath baseband I/Q data c and the signal d to obtain correlation peak data e; carrying out peak searching and interpolation operation on the related peak data e to obtain delay f at the peak; generating a synchronous linear frequency modulation signal g based on the delay f and the integer coset delay; based on the signal g and the multipath baseband I/Q data c, the phase nonlinearity h of the digital phased array receiving channel is calculated. The algorithm software has the advantages of low resource cost and high measurement speed, and does not need auxiliary narrow pulse generation equipment and ultra-high-speed data acquisition equipment.
Description
Technical Field
The invention relates to the technical field of signal testing, in particular to a method and a device for measuring phase nonlinearity of a digital phased array receiving channel.
Background
Phase nonlinearity is one of the important performance indicators of digital phased array receive channels. The ideal transmission system has no nonlinear distortion of phase, but the phase and frequency in the frequency band do not have strict linear relation due to the influence of factors such as a filter, a mixer, an amplifier, an impedance matching network and the like in the receiving link, and the phase nonlinear distortion is particularly obvious in a broadband system. The phase nonlinear index directly determines the distortion degree of the signal passing through the transmission system, not only affects the pulse pressure side lobe performance of the radar system or the intersymbol interference performance of the communication system, but also affects the beam forming performance of the phased array system, and has important significance on the performance index of the whole digital phased array system.
The traditional measuring method of the phase nonlinearity is to directly measure a two-port measured analog network by adopting a testing scheme based on a vector network analyzer, such as a measuring method and a measuring device of a nonlinear vector network analyzer with double phase references disclosed in the patent application number 201710943353.9. However, this method has the following limitations: first, the phase nonlinearity of analog-to-digital hybrid systems like digital phased array receive channels (from antenna to ADC baseband data) cannot be measured directly; secondly, it is difficult to directly measure the phase nonlinearity of the variable frequency system; finally, the test efficiency is low and the phase nonlinearity of a large digital phased array with thousands of channels cannot be measured simultaneously.
The invention patent application with the application number 201610702093.1 provides a digital domain phase nonlinear measurement method, which is based on narrow pulse signals with specific time width and repetition period, and phase nonlinear distortion is obtained by deconvolution processing or full-phase FFT conversion algorithm. The measuring method has strict requirements on the width of the test pulse, particularly extremely narrow pulse is required to be generated when the measuring method is applied to large bandwidth, and the requirement on hardware is high. Meanwhile, the effective sampling window of the measuring method is narrow pulse width, in order to obtain enough data analysis samples, the sampling interval of the system needs to be far smaller than the narrow pulse width, ultra-high-speed data acquisition equipment is needed in broadband application, and the hardware cost burden is additionally increased.
In view of this, it is necessary to develop a fast and simple phase nonlinear measurement method in the digital domain based on the inherent calibration network of the system without adding additional testing equipment for the large-scale frequency conversion and analog-digital hybrid system such as the digital phased array receiving channel, thereby reducing the software and hardware cost and the total testing time of the testing system. Therefore, a method and a device for measuring the phase nonlinearity of a digital phased array receiving channel are provided.
Disclosure of Invention
The technical problem to be solved by the invention is how to realize the measurement of phase nonlinearity in the digital domain without adding additional test equipment.
The invention solves the technical problems by the following technical means:
In one aspect, the invention provides a method for measuring phase nonlinearity of a digital phased array receiving channel, which comprises the following steps:
Generating a baseband linear frequency modulation signal a, correcting the baseband linear frequency modulation signal a based on a correction source, and generating a broadband radio frequency linear frequency modulation signal b;
inputting the broadband radio frequency linear frequency modulation signal b into a digital phased array receiving channel to obtain multi-path baseband I/Q data c;
Carrying out integer time delay on the baseband linear frequency modulation signal a to obtain a time delay linear frequency modulation signal d;
performing cross-correlation operation on the multipath baseband I/Q data c and the delay linear frequency modulation signal d to obtain correlation peak data e;
performing peak searching and interpolation operation on the related peak data e to obtain delay f at a peak value;
Generating a synchronous linear frequency modulation signal g based on the delay f and the integer multiple delay;
and calculating the phase nonlinearity h of the digital phased array receiving channel based on the synchronous chirp signal g and the multipath baseband I/Q data c.
The invention processes the broadband test linear frequency modulation signal based on the correction source and the receiving channel of the digital phased array system, and simultaneously measures the phase nonlinearity of all channels by utilizing the precisely synchronous broadband linear frequency modulation signal, thereby having small algorithm software resource cost and high measurement speed without auxiliary narrow pulse generating equipment and ultra-high speed data acquisition equipment.
Optionally, the bandwidth of the baseband chirp signal a is the same as the channel bandwidth of the digital phased array receiving channel, and the time-width bandwidth product of the baseband chirp signal a is not less thanWhereinThe (in degrees) is the phase nonlinear measurement error and the SNR (in dB) is the signal-to-noise ratio of the baseband chirp signal a.
Optionally, the correcting the baseband chirp signal a based on a correction source generates a wideband radio frequency chirp signal b, including:
And (3) sequentially performing digital-to-analog conversion, up-conversion, filtering and signal amplification on the baseband linear frequency modulation signal a by adopting a correction source generating module to generate the broadband radio frequency linear frequency modulation signal b, wherein the correction source is a correction source after inherent phase nonlinear self-calibration.
Optionally, the inputting the wideband radio frequency chirp signal b into a digital phased array receiving channel to obtain multiple paths of baseband I/Q data c includes:
And the digital phased array receiving channel sequentially performs down-conversion, filtering, signal amplification and digital preprocessing on the broadband radio frequency linear frequency modulation signal b to obtain the multipath baseband I/Q data c.
Optionally, the integer multiple of the delay is equal to a sum of the delay of the correction source generating module and the delay of the digital phased array receive channel.
Optionally, the cross-correlation operation is performed on the multipath baseband I/Q data c and the delayed chirp signal d to obtain correlation peak data e, which includes:
Performing time domain turnover on the delayed linear frequency modulation signal d;
Performing conjugate fetching operation on the multipath baseband I/Q data c;
And carrying out convolution operation on the time-domain overturned delay linear frequency modulation signal and the multi-path baseband I/Q data after conjugation, and outputting the correlation peak data e.
Optionally, the performing peak searching and interpolation operation on the correlation peak data e to obtain a delay f at a peak value includes:
Performing peak searching operation on the related peak data e to obtain a data sample near a peak value;
and calculating the delay f at the peak value by adopting a high-order polynomial interpolation algorithm based on the data samples near the peak value.
Optionally, the delay of generating the synchronous chirp signal g is the sum of the delay f and the integer multiple delay.
Optionally, the calculating the phase nonlinearity h of the digital phased array receiving channel based on the synchronous chirp signal g and the multipath baseband I/Q data c includes:
respectively carrying out phase calculation on the synchronous linear frequency modulation signal g and the multipath baseband I/Q data c to obtain a phase calculation result;
Performing difference calculation on the phase calculation result to obtain a difference result;
And performing declivity calculation on the difference result, removing a first-order linear component and a direct current component, and outputting the phase nonlinearity h.
In addition, the invention also provides a device for measuring the phase nonlinearity of the digital phased array receiving channel, which comprises:
The test linear frequency modulation signal generation module is used for generating a baseband linear frequency modulation signal a and inputting the baseband linear frequency modulation signal a into the correction source generation module and the integer multiple delay module;
the correction source generation module is used for correcting the baseband linear frequency modulation signal a, outputting a broadband radio frequency linear frequency modulation signal b and feeding the broadband radio frequency linear frequency modulation signal b into a digital phased array receiving channel through a coupling network;
The digital phased array receiving channel is used for processing the broadband radio frequency linear frequency modulation signal b to form multi-path baseband I/Q data c and inputting the multi-path baseband I/Q data c to the correlator module;
The integer time delay module is used for carrying out integer time clock period time delay on the baseband linear frequency modulation signal a to obtain a time delay linear frequency modulation signal d and inputting the time delay linear frequency modulation signal d to the correlator module;
The correlator module is used for carrying out cross-correlation operation on the delay linear frequency modulation signal d and the multipath baseband I/Q data c to obtain correlation peak data e and inputting the correlation peak data e to the delay calculation module;
the delay calculation module is used for carrying out peak searching and interpolation operation on the related peak data e to obtain delay f at a peak value and inputting the delay f to the synchronous linear frequency modulation signal generation module;
The synchronous linear frequency modulation signal generation module is used for generating a synchronous linear frequency modulation signal g to the phase nonlinear calculation module based on the delay f and the integral multiple delay;
the phase nonlinear calculation module is used for calculating the phase nonlinearity h of the digital phased array receiving channel based on the synchronous linear frequency modulation signal g and the multipath baseband I/Q data c.
Optionally, the bandwidth of the baseband chirp signal a is the same as the channel bandwidth of the digital phased array receiving channel, and the time-width bandwidth product of the baseband chirp signal a is not less thanWhereinFor phase non-linearity measurement error, SNR is the signal-to-noise ratio of baseband chirp signal a.
Optionally, the correction source generating module is specifically configured to:
and sequentially performing digital-to-analog conversion, up-conversion, filtering and signal amplification on the baseband linear frequency modulation signal a to generate the broadband radio frequency linear frequency modulation signal b.
Optionally, the integer multiple of the delay is equal to a sum of the delay of the correction source generating module and the delay of the digital phased array receive channel.
Optionally, the correlator module comprises:
the time domain overturning unit is used for carrying out time domain overturning on the delay linear frequency modulation signal d and inputting the overturned signal into the convolution unit;
The conjugation taking unit is used for carrying out conjugation taking operation on the multipath baseband I/Q data c and inputting conjugated signals to the convolution unit;
and the convolution unit carries out convolution operation on the time-domain-flipped time-delay linear frequency modulation signal and the multi-path baseband I/Q data after conjugation, and outputs the correlation peak data e.
Optionally, the phase nonlinear calculation module includes:
The first phase calculation unit is used for carrying out phase calculation on the synchronous linear frequency modulation signal g to obtain a first phase calculation result and inputting the first phase calculation result to the difference calculation unit;
The second phase calculation unit is used for carrying out phase calculation on the multipath baseband I/Q data c to obtain a second phase calculation result and inputting the second phase calculation result to the difference calculation unit;
The difference value calculation unit is used for carrying out difference value operation on the first phase calculation result and the second phase calculation result and inputting the difference value result into the declivity calculation unit;
The declivity calculation unit is used for performing declivity operation on the difference result, removing a first-order linear component and a direct current component, and outputting the phase nonlinearity h.
In addition, the invention also provides a device for measuring the phase nonlinearity of the digital phased array receiving channel, which comprises a memory and a processor; wherein the processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory for implementing the method as described above.
Furthermore, the invention proposes a computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements a method as described above.
The invention has the advantages that:
(1) The invention processes the broadband test linear frequency modulation signal based on the correction source and the receiving channel of the digital phased array system, and simultaneously measures the phase nonlinearity of all channels by utilizing the precisely synchronous broadband linear frequency modulation signal, thereby having small algorithm software resource cost and high measurement speed without auxiliary narrow pulse generating equipment and ultra-high speed data acquisition equipment.
(2) The time width of the broadband test linear frequency modulation signal is far greater than the pulse width of the traditional single pulse method, the data sampling rate is far lower than the sampling rate of the traditional single pulse method, and the hardware complexity and the cost are greatly reduced.
(3) The invention comprehensively adopts the phase difference solving and phase declivity method to calculate the phase nonlinearity of the digital phased array receiving channel, and has low algorithm complexity and high measurement accuracy of the phase nonlinearity.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method of measuring phase nonlinearity of a digital phased array receive channel in accordance with the present invention;
FIG. 2 is a flow chart of correlation peak data calculation in the present invention;
FIG. 3 is a flow chart of phase nonlinear computation in the present invention;
FIG. 4 is a block diagram of a digital phased array receive path phase nonlinearity measurement device of the present invention;
FIG. 5 is a block diagram of a correlator module in accordance with the present invention;
FIG. 6 is a block diagram of a phase nonlinear computation module in the present invention;
fig. 7 is a block diagram of a digital phased array receive channel phase nonlinearity measurement device of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart of an embodiment of a method for measuring phase nonlinearity of a digital phased array receiving channel according to the present invention, the method includes the following steps:
S101, generating a baseband linear frequency modulation signal a, correcting the baseband linear frequency modulation signal a based on a correction source, and generating a broadband radio frequency linear frequency modulation signal b;
illustratively, the baseband chirp signal a may be:
Wherein, Is a baseband linear frequency modulation signal a; k is the slope of the digital modulation,BW is the bandwidth of the baseband chirp signal a,Is the time width of the baseband chirp signal a,Is the sampling rate; n is an integer between [ -N/2, N/2], N is the number of effective samples of the baseband chirp signal a,; J is。
In this embodiment, k=1.25, the bandwidth of the baseband chirp signal a is 1GHz, the time width is 50us, the sampling rate is 4gsps, and n=200000.
S102, inputting the broadband radio frequency linear frequency modulation signal b into a digital phased array receiving channel to obtain multi-path baseband I/Q data c;
In this embodiment, the wideband rf chirped signal b is fed into the digital phased array receiving channel via the feed network.
Illustratively, the wideband radio frequency chirp signal b may be:
Wherein, Is multipath baseband I/Q data c; delay for integer times of the multipath baseband I/Q data c; a fractional time delay for the multipath baseband I/Q data c; Is the phase nonlinear data to be solved.
S103, carrying out integer time delay on the baseband linear frequency modulation signal a to obtain a time delay linear frequency modulation signal d;
Illustratively, the time-delayed chirp signal d may be:
wherein the delay value of the integral multiple delay Is equal to the sum of the delay of the correction source and the delay of the digital phased array receiving channel, so that the delay chirped signal d is roughly synchronous in time with the multipath baseband I/Q data c.
S104, carrying out cross-correlation operation on the multipath baseband I/Q data c and the delay linear frequency modulation signal d to obtain correlation peak data e;
S105, carrying out peak searching and interpolation operation on the related peak data e to obtain delay f at a peak value;
s106, generating a synchronous linear frequency modulation signal g based on the delay f and the integer multiple delay;
and S107, calculating the phase nonlinearity h of the digital phased array receiving channel based on the synchronous chirp signal g and the multipath baseband I/Q data c.
The embodiment of the invention processes the broadband test linear frequency modulation signal based on the correction source and the receiving channel of the digital phased array system, and simultaneously measures the phase nonlinearity of all channels by utilizing the precisely synchronous broadband linear frequency modulation signal, so that the algorithm software has low resource cost and high measurement speed, and does not need auxiliary narrow pulse generating equipment and ultra-high speed data acquisition equipment.
In an embodiment, the bandwidth of the baseband chirp signal a is the same as the channel bandwidth of the digital phased array receiving channel, and the time-width bandwidth product of the baseband chirp signal a is not less thanWhereinThe (in degrees) is the phase nonlinear measurement error and the SNR (in dB) is the signal-to-noise ratio of the baseband chirp signal a.
In this embodiment, the phase nonlinear measurement error is required to be smaller than 1 ° and the signal-to-noise ratio of the baseband chirp signal a is 10dB, so the time-bandwidth product is not smaller than 12960, and 1ghz×50us=50000 is actually taken.
It should be noted that, the time width of the baseband chirp signal a is far greater than the pulse width of the traditional single pulse method, and the data sampling rate is far lower than that of the traditional single pulse method, thus greatly reducing the hardware complexity and cost.
In an embodiment, the step S101 specifically includes:
And adopting the correction source to sequentially perform digital-to-analog conversion, up-conversion, filtering and signal amplification treatment on the baseband linear frequency modulation signal a to generate the broadband radio frequency linear frequency modulation signal b, wherein the correction source is a correction source after inherent phase nonlinear self-calibration.
It should be noted that the self-calibration can be accomplished by using oscilloscope data acquisition, predistortion filter coefficient calculation and digital predistortion compensation methods to correct the inherent phase nonlinearity of the source.
In one embodiment, the step S102 specifically includes:
And the digital phased array receiving channel sequentially performs down-conversion, filtering, signal amplification and digital preprocessing on the broadband radio frequency linear frequency modulation signal b to obtain the multipath baseband I/Q data c.
In one embodiment, referring to fig. 2, the step S104 includes the following steps:
s1041, performing time domain inversion on the delay linear frequency modulation signal d;
S1042, performing conjugate operation on the multipath baseband I/Q data c;
S1043, performing convolution operation on the time-domain-flipped time-delay linear frequency modulation signal and the multi-path baseband I/Q data after conjugation, and outputting the correlation peak data e.
For example, as the correlation peak after convolution operation appears in the middle region of the data, only the output correlation peak result of the middle region is needed to be calculated, and all correlation peak data are not needed to be calculated in the whole process, so that the operation amount is greatly reduced; in one embodiment, only the middle 20 consecutive data are calculated, enough to cover one complete correlation peak.
In one embodiment, the step S105 includes the following steps:
s1051, carrying out peak searching operation on the related peak data e to obtain a data sample near a peak value;
s1052, calculating the delay f at the peak by adopting a high-order polynomial interpolation algorithm based on the data samples near the peak.
Exemplary, three-point amplitudes at the peak are taken as、AndThe three points correspond to the time delay values respectively as follows、AndThe value of the exact delay f is:
Wherein, Is the exact delay f.
In an embodiment, in the step S106, the delay of generating the synchronous chirp signal g is a sum of the delay f and the integer multiple delay.
Illustratively, the synchronous chirp signal g may be:
。
In one embodiment, referring to fig. 3, the step S107 includes the following steps:
s1071, respectively carrying out phase calculation on the synchronous linear frequency modulation signal g and the multipath baseband I/Q data c to obtain a phase calculation result;
illustratively, the phase calculation employs an arctangent calculation method based on coordinate rotation digital computing (CORDIC).
S1072, carrying out difference calculation on the phase calculation result to obtain a difference result;
illustratively, the phase difference value operation result of the synchronous chirp signal g and the multipath baseband I/Q data c may be:
Wherein, Is the phase difference value operation result.
S1073, performing declivity calculation on the difference result, removing a first-order linear component and a direct current component, and outputting the phase nonlinearity h.
Illustratively, a least squares linear fitting algorithm is employed to obtainThe slope of (2) isObtainingIs biased to；
RemovingThe phase nonlinearity h is obtained by the slope and the bias term:
。
In this embodiment, the phase difference and phase deskewing methods are comprehensively adopted, so that algorithm complexity is low, and measurement accuracy of phase nonlinearity is high.
Referring to fig. 4, fig. 4 is a flow chart of an embodiment of a digital phased array receiving channel phase nonlinearity measurement device according to the present invention, the device includes:
A test chirp signal generating module 201 for generating a baseband chirp signal a and inputting the baseband chirp signal a to a correction source generating module 202 and an integer multiple delay module 204;
The correction source generating module 202 is configured to correct the baseband chirped signal a, output a wideband radio frequency chirped signal b, and feed the wideband radio frequency chirped signal b to the digital phased array receiving channel 203 via a coupling network;
The digital phased array receiving channel 203 is configured to process the wideband radio frequency chirp signal b to form multiple paths of baseband I/Q data c and input the multiple paths of baseband I/Q data c to the correlator module 205;
The integer time delay module 204 is configured to perform integer time clock period time delay on the baseband chirp signal a, obtain a time delay chirp signal d, and input the time delay chirp signal d to the correlator module 205;
wherein the integer multiple of the delay is equal to the sum of the delay of the correction source generation module and the delay of the digital phased array receive channel.
The correlator module 205 is configured to perform a cross-correlation operation on the delayed chirped signal d and the multipath baseband I/Q data c, obtain correlation peak data e, and input the correlation peak data e to the delay calculation module 206;
The delay calculation module 206 is configured to perform peak searching and interpolation operation on the correlation peak data e, obtain a delay f at a peak value, and input the delay f to the synchronous chirp signal generation module 207;
The synchronous chirp signal generating module 207 is configured to generate a synchronous chirp signal g to the phase nonlinear calculating module 208 based on the delay f and the integer multiple delay;
The phase nonlinearity calculation module 208 is configured to calculate a phase nonlinearity h of the digital phased array receiving channel based on the synchronous chirp signal g and the multipath baseband I/Q data c.
The embodiment of the invention processes the broadband test linear frequency modulation signal based on the correction source and the receiving channel of the digital phased array system, and simultaneously measures the phase nonlinearity of all channels by utilizing the precisely synchronous broadband linear frequency modulation signal, so that the algorithm software has low resource cost and high measurement speed, and does not need auxiliary narrow pulse generating equipment and ultra-high speed data acquisition equipment.
In an embodiment, the bandwidth of the baseband chirp signal a is the same as the channel bandwidth of the digital phased array receiving channel, and the time-width bandwidth product of the baseband chirp signal a is not less thanWhereinThe (in degrees) is the phase nonlinear measurement error and the SNR (in dB) is the signal-to-noise ratio of the baseband chirp signal a.
It should be noted that, the time width of the baseband chirp signal a is far greater than the pulse width of the traditional single pulse method, the data sampling rate is far lower than the sampling rate of the traditional single pulse method, the hardware complexity and the cost are greatly reduced, and the selection of the time-width product depends on the phase nonlinear measurement error and the signal-to-noise ratio of the baseband chirp signal a.
In one embodiment, the correction source generating module 202 is specifically configured to:
And adopting the correction source to sequentially perform digital-to-analog conversion, up-conversion, filtering and signal amplification treatment on the baseband linear frequency modulation signal a to generate the broadband radio frequency linear frequency modulation signal b, wherein the correction source is a correction source after inherent phase nonlinear self-calibration.
It should be noted that the self-calibration can be accomplished by using oscilloscope data acquisition, predistortion filter coefficient calculation and digital predistortion compensation methods to correct the inherent phase nonlinearity of the source.
In an embodiment, the digital phased array receiving channel 203 is specifically configured to:
And the digital phased array receiving channel sequentially performs down-conversion, filtering, signal amplification and digital preprocessing on the broadband radio frequency linear frequency modulation signal b to obtain the multipath baseband I/Q data c.
In one embodiment, referring to fig. 5, the correlator module 205 comprises:
the time domain overturning unit 205a is configured to overturn the time domain of the delayed chirped signal d, and input the overturned signal to the convolution unit;
A conjugation taking unit 205b, configured to perform conjugation taking operation on the multipath baseband I/Q data c, and input a conjugated signal to the convolution unit;
the convolution unit 205c performs convolution operation on the time-lapse chirp signal after time-lapse inversion and the multi-path baseband I/Q data after conjugation, and outputs the correlation peak data e.
In one embodiment, referring to fig. 6, the phase nonlinear calculation module 208 includes:
A first phase calculating unit 208a, configured to perform phase calculation on the synchronous chirp signal g, obtain a first phase calculation result, and input the first phase calculation result to a difference calculating unit;
A second phase calculation unit 208b, configured to perform phase calculation on the multiple paths of baseband I/Q data c, obtain a second phase calculation result, and input the second phase calculation result to the difference calculation unit;
the difference calculating unit 208c is configured to perform a difference operation on the first phase calculation result and the second phase calculation result, and input the difference result to a deskewing calculating unit;
The deskewing calculation unit 208d is configured to perform a deskewing operation on the difference result, remove a first-order linear component and a direct current component, and output the phase nonlinearity h.
In this embodiment, the phase difference and phase deskewing methods are comprehensively adopted, so that algorithm complexity is low, and measurement accuracy of phase nonlinearity is high.
It should be noted that, other embodiments of the digital phased array receiving channel phase nonlinearity measuring apparatus or implementation methods of the present invention may refer to the above method embodiments, and are not repeated here.
In addition, referring to fig. 7, an embodiment of the present invention further proposes a digital phased array receiving channel phase nonlinearity measurement device, where the device includes a processor 100, a memory 200 storing program instructions, a bus 300, and a communication interface 400, where the processor 100, the communication interface 400, and the memory 200 are connected through the bus 300; the processor 100 is configured to perform the method as described in the above embodiments when executing the program instructions.
The memory 200 may include a high-speed Random Access Memory (RAM), and may further include a non-volatile memory (non-volatilememory), such as at least one disk memory. The communication connection between the system network element and the at least one other network element is implemented through at least one communication interface (which may be wired or wireless), the internet, a wide area network, a local network, a metropolitan area network, etc. may be used.
Bus 300 may be an ISA bus, a PCI bus, an EISA bus, or the like. The buses may be divided into address buses, data buses, control buses, etc. The memory 200 is configured to store a program, and the processor 100 executes the program after receiving an execution instruction, and the digital phased array receiving channel phase nonlinearity measurement program disclosed in any of the foregoing embodiments of the present application may be applied to the processor 100 or implemented by the processor 100.
The processor 100 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 100 or by instructions in the form of software. The processor 100 may be a general-purpose processor, including a Central Processing Unit (CPU), a network processor (NetworkProcessor NP), and the like; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 200, and the processor 100 reads the information in the memory 200 and, in combination with its hardware, performs the steps of the above method.
Furthermore, the embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method as described above.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (15)
1. A method for measuring phase nonlinearity of a digital phased array receive channel, the method comprising:
Generating a baseband linear frequency modulation signal a, correcting the baseband linear frequency modulation signal a based on a correction source, and generating a broadband radio frequency linear frequency modulation signal b;
inputting the broadband radio frequency linear frequency modulation signal b into a digital phased array receiving channel to obtain multi-path baseband I/Q data c;
Carrying out integer time delay on the baseband linear frequency modulation signal a to obtain a time delay linear frequency modulation signal d;
performing cross-correlation operation on the multipath baseband I/Q data c and the delay linear frequency modulation signal d to obtain correlation peak data e;
performing peak searching and interpolation operation on the related peak data e to obtain delay f at a peak value;
Generating a synchronous linear frequency modulation signal g based on the delay f and the integer multiple delay;
Based on the synchronous chirp signal g and the multipath baseband I/Q data c, calculating a phase nonlinearity h of the digital phased array receiving channel, comprising:
respectively carrying out phase calculation on the synchronous linear frequency modulation signal g and the multipath baseband I/Q data c to obtain a phase calculation result;
Performing difference calculation on the phase calculation result to obtain a difference result;
And performing declivity calculation on the difference result, removing a first-order linear component and a direct current component, and outputting the phase nonlinearity h.
2. The method for measuring phase nonlinearity of a digital phased array reception channel as claimed in claim 1, wherein a bandwidth of said baseband chirp signal a is the same as a channel bandwidth of said digital phased array reception channel, and a time-width-bandwidth product of said baseband chirp signal a is not less thanWherein, the method comprises the steps of, wherein,For phase non-linearity measurement error, SNR is the signal-to-noise ratio of baseband chirp signal a.
3. The method for measuring phase nonlinearity of a digital phased array receiving channel as claimed in claim 1, wherein said correcting the baseband chirp signal a based on a correction source generates a wideband radio frequency chirp signal b comprising:
And adopting the correction source to sequentially perform digital-to-analog conversion, up-conversion, filtering and signal amplification treatment on the baseband linear frequency modulation signal a to generate the broadband radio frequency linear frequency modulation signal b, wherein the correction source is a correction source after inherent phase nonlinear self-calibration.
4. The method for measuring phase nonlinearity of a digital phased array receiving channel as claimed in claim 1, wherein said inputting the wideband radio frequency chirp signal b into the digital phased array receiving channel to obtain multiple paths of baseband I/Q data c comprises:
And the digital phased array receiving channel sequentially performs down-conversion, filtering, signal amplification and digital preprocessing on the broadband radio frequency linear frequency modulation signal b to obtain the multipath baseband I/Q data c.
5. A method of measuring phase nonlinearity of a digital phased array receive channel as claimed in claim 3, wherein the integer multiple of delay is equal to the sum of the delay of the correction source generation module and the delay of the digital phased array receive channel.
6. The method for measuring phase nonlinearity of a digital phased array receiving channel as claimed in claim 1, wherein said cross-correlating the multipath baseband I/Q data c with the delay chirp signal d to obtain correlation peak data e comprises:
Performing time domain turnover on the delayed linear frequency modulation signal d;
Performing conjugate fetching operation on the multipath baseband I/Q data c;
And carrying out convolution operation on the time-domain overturned delay linear frequency modulation signal and the multi-path baseband I/Q data after conjugation, and outputting the correlation peak data e.
7. The method for measuring phase nonlinearity of a digital phased array receiving channel as claimed in claim 1, wherein said performing peak searching and interpolation on the correlation peak data e to obtain a delay f at a peak value comprises:
Performing peak searching operation on the related peak data e to obtain a data sample near a peak value;
and calculating the delay f at the peak value by adopting a high-order polynomial interpolation algorithm based on the data samples near the peak value.
8. A method for measuring phase nonlinearity of a digital phased array receive channel as claimed in claim 1, wherein the delay of generation of the synchronous chirp signal g is the sum of the delay f and the integer multiple of the delay.
9. A digital phased array receive path phase nonlinearity measurement device, the device comprising:
The test linear frequency modulation signal generation module is used for generating a baseband linear frequency modulation signal a and inputting the baseband linear frequency modulation signal a into the correction source generation module and the integer multiple delay module;
the correction source generation module is used for correcting the baseband linear frequency modulation signal a, outputting a broadband radio frequency linear frequency modulation signal b and feeding the broadband radio frequency linear frequency modulation signal b into a digital phased array receiving channel through a coupling network;
The digital phased array receiving channel is used for processing the broadband radio frequency linear frequency modulation signal b to form multi-path baseband I/Q data c and inputting the multi-path baseband I/Q data c to the correlator module;
The integer time delay module is used for carrying out integer time clock period time delay on the baseband linear frequency modulation signal a to obtain a time delay linear frequency modulation signal d and inputting the time delay linear frequency modulation signal d to the correlator module;
The correlator module is used for carrying out cross-correlation operation on the delay linear frequency modulation signal d and the multipath baseband I/Q data c to obtain correlation peak data e and inputting the correlation peak data e to the delay calculation module;
the delay calculation module is used for carrying out peak searching and interpolation operation on the related peak data e to obtain delay f at a peak value and inputting the delay f to the synchronous linear frequency modulation signal generation module;
The synchronous linear frequency modulation signal generation module is used for generating a synchronous linear frequency modulation signal g to the phase nonlinear calculation module based on the delay f and the integral multiple delay;
The phase nonlinear calculation module is used for calculating the phase nonlinearity h of the digital phased array receiving channel based on the synchronous linear frequency modulation signal g and the multipath baseband I/Q data c;
the phase nonlinear calculation module comprises:
The first phase calculation unit is used for carrying out phase calculation on the synchronous linear frequency modulation signal g to obtain a first phase calculation result and inputting the first phase calculation result to the difference calculation unit;
The second phase calculation unit is used for carrying out phase calculation on the multipath baseband I/Q data c to obtain a second phase calculation result and inputting the second phase calculation result to the difference calculation unit;
The difference value calculation unit is used for carrying out difference value operation on the first phase calculation result and the second phase calculation result and inputting the difference value result into the declivity calculation unit;
The declivity calculation unit is used for performing declivity operation on the difference result, removing a first-order linear component and a direct current component, and outputting the phase nonlinearity h.
10. The apparatus for measuring phase nonlinearity of a digital phased array reception channel as claimed in claim 9, wherein a bandwidth of said baseband chirp signal a is the same as a channel bandwidth of said digital phased array reception channel, and a time-width-bandwidth product of said baseband chirp signal a is not less thanWherein, the method comprises the steps of, wherein,For phase non-linearity measurement error, SNR is the signal-to-noise ratio of baseband chirp signal a.
11. The apparatus for measuring phase nonlinearity of a digital phased array receive channel as claimed in claim 9, wherein said correction source generation module is configured to:
and sequentially performing digital-to-analog conversion, up-conversion, filtering and signal amplification on the baseband linear frequency modulation signal a to generate the broadband radio frequency linear frequency modulation signal b.
12. The apparatus for measuring phase nonlinearity of a digital phased array receive channel as claimed in claim 9, wherein the integer multiple delay is equal to a sum of the delay of the correction source generation module and the delay of the digital phased array receive channel.
13. The digital phased array receive path phase nonlinearity measurement device of claim 9, wherein the correlator module comprises:
the time domain overturning unit is used for carrying out time domain overturning on the delay linear frequency modulation signal d and inputting the overturned signal into the convolution unit;
The conjugation taking unit is used for carrying out conjugation taking operation on the multipath baseband I/Q data c and inputting conjugated signals to the convolution unit;
and the convolution unit carries out convolution operation on the time-domain-flipped time-delay linear frequency modulation signal and the multi-path baseband I/Q data after conjugation, and outputs the correlation peak data e.
14. A digital phased array receiving channel phase nonlinearity measuring device, wherein the device comprises a memory and a processor; wherein the processor runs a program corresponding to executable program code stored in the memory by reading the executable program code for implementing the method according to any one of claims 1-8.
15. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the method according to any of claims 1-8.
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