CN115494464A - Pre-distortion compensation method for linear frequency modulation signal, electronic device and storage medium - Google Patents
Pre-distortion compensation method for linear frequency modulation signal, electronic device and storage medium Download PDFInfo
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Abstract
The invention discloses a predistortion compensation method of a linear frequency modulation signal, electronic equipment and a storage medium, wherein the method comprises the following steps: acquiring a linear frequency modulation signal to be compensated, and a first transmission feedback signal and a second transmission feedback signal of the linear frequency modulation signal to be compensated; respectively acquiring pulse position information of a linear frequency modulation signal to be compensated, a first transmission feedback signal and a second transmission feedback signal; respectively calculating the amplitude and the phase of the pulse width signal to be compensated, the amplitude and the phase of the first pulse width signal and the amplitude and the phase of the second pulse width signal; calculating the amplitude predistortion quantity of the pulse width signal to be compensated according to the amplitudes of the first pulse width signal and the second pulse width signal; calculating to obtain the phase angle predistortion quantity of the pulse width signal to be compensated according to the phase angles of the first pulse width signal and the second pulse width signal; and respectively compensating the amplitude and the phase angle of the compensation pulse width signal according to the amplitude predistortion quantity and the phase angle predistortion quantity to obtain a compensated linear frequency modulation signal. The method of the invention can reduce the calculation amount of predistortion compensation.
Description
Technical Field
The invention relates to the technical field of radar system integration test and imaging processing, in particular to a predistortion compensation method for a linear frequency modulation signal, electronic equipment and a readable storage medium.
Background
When a radar system is set, in order to comprehensively compensate for the influence of a time-varying phase error caused by a system transceiving channel on imaging processing, a calibration signal is generally acquired to analyze, then the phase error and the amplitude error of the calibration signal are extracted and compensated in a reverse direction to a transmitting signal of a frequency modulation source end, so that a basically ideal signal waveform can be obtained at a receiving end, and an improved compression index is obtained.
In a high-resolution radar, an ultra-wideband chirp signal becomes the most commonly used radar signal based on the selectable phase-frequency characteristics of time-bandwidth products and square laws and the characteristic that the frequency spectrum characteristics are close to rectangular, but correspondingly, the predistortion compensation of the ultra-wideband chirp signal by using an analog predistortion compensation technology or a digital predistortion compensation technology generates larger calculated amount, so that a large amount of hardware resources are consumed, and the development of the whole system towards miniaturization and light weight is not facilitated.
Disclosure of Invention
In view of this, embodiments of the present invention provide a predistortion compensation method for a chirp signal, an electronic device, and a readable storage medium, so as to solve the problems that when an existing predistortion compensation technology is used to perform predistortion compensation on an ultra wideband chirp signal, a calculation amount is large, and a corresponding resource consumption amount is large.
According to a first aspect, an embodiment of the present invention provides a predistortion compensation method for a chirp signal, including the following steps:
acquiring a linear frequency modulation signal to be compensated, and a first transmission feedback signal and a second transmission feedback signal of the linear frequency modulation signal to be compensated; the first transmitting feedback signal is a signal fed back after the to-be-compensated linear frequency modulation signal only passes through the power divider, and the second transmitting feedback signal is a signal fed back after the to-be-compensated linear frequency modulation signal passes through the load and the power divider;
respectively acquiring pulse position information of the to-be-compensated linear frequency modulation signal, the first transmission feedback signal and the second transmission feedback signal, and correspondingly extracting pulse width part signals of the to-be-compensated linear frequency modulation signal, the first transmission feedback signal and the second transmission feedback signal according to the pulse position information to obtain a to-be-compensated pulse width signal, a first pulse width signal and a second pulse width signal; the pulse position information includes a pulse start point and a pulse end point; the pulse end point of the to-be-compensated linear frequency modulation signal is the maximum amplitude point of the signal obtained by performing pulse compression on the to-be-compensated linear frequency modulation signal based on the matched filtering characteristic function, the pulse start point of the to-be-compensated linear frequency modulation signal is obtained by calculation according to the pulse end point and the number of pulse points, and the number of the pulse points is obtained according to the pulse width; similarly, obtaining pulse position information of the first transmission feedback signal and the second transmission feedback signal;
respectively calculating the amplitude and the phase of the pulse width signal to be compensated, the amplitude and the phase of the first pulse width signal and the amplitude and the phase of the second pulse width signal;
calculating the amplitude predistortion quantity of the pulse width signal to be compensated according to the amplitudes of the first pulse width signal and the second pulse width signal;
calculating the phase angle predistortion quantity of the pulse width signal to be compensated according to the phase angles of the first pulse width signal and the second pulse width signal;
and respectively compensating the amplitude and the phase angle of the pulse width signal to be compensated according to the amplitude predistortion quantity and the phase angle predistortion quantity to obtain a compensated linear frequency modulation signal.
Further, the predistortion compensation method for the chirp signal further comprises the following steps:
judging whether the flatness in the working frequency band of the compensated linear frequency modulation signal is smaller than a preset value or not;
and when the flatness in the working frequency band of the compensated linear frequency modulation signal is greater than or equal to a preset value, taking the compensated linear frequency modulation signal as the linear frequency modulation signal to be compensated, and repeating the compensation step until the flatness in the working frequency band of the compensated linear frequency modulation signal is less than the preset value.
Further, the step of calculating the amplitude predistortion amount of the pulse width signal to be compensated according to the amplitudes of the first pulse width signal and the second pulse width signal includes:
calculating the ratio of the amplitude of the second pulse width signal to the amplitude of the first pulse width signal to obtain an initial amplitude predistortion quantity;
and performing envelope operation on the initial amplitude predistortion quantity to obtain the amplitude predistortion quantity of the pulse width signal to be compensated.
Further, the step of calculating the phase angle predistortion quantity of the pulse width signal to be compensated according to the phase angles of the first pulse width signal and the second pulse width signal includes:
calculating the difference value of the phase angle of the second pulse width signal relative to the phase angle of the first pulse width signal to obtain an initial phase angle predistortion quantity;
and performing envelope calculation on the initial phase angle predistortion quantity to obtain the phase angle predistortion quantity of the pulse width signal to be compensated.
Further, the matched filter characteristic function is obtained by performing left-right inversion on a pulse pressure coefficient by taking tr =0 as an axis and then performing complex conjugate processing, wherein the pulse pressure coefficient is:
wherein i represents a complex number, kr = Br/Tp is a modulation slope, br means a chirp signal bandwidth, and Tp means a pulse widthTr is a detection time range calculated according to the pulse width and the sampling rate, and tr =0 represents a time axis zero point corresponding to the detection time range.
Further, the specific steps of performing pulse compression on the chirp signal to be compensated based on the matched filtering feature function include:
converting the linear frequency modulation signal to be compensated and the matched filtering characteristic function into a frequency domain through fast Fourier transform, and multiplying the linear frequency modulation signal to be compensated and the matched filtering characteristic function in the frequency domain to obtain a frequency domain signal after pulse pressure;
and converting the frequency domain signal after pulse pressure back to a time domain through inverse Fourier transform.
According to a second aspect, an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores computer instructions, and the processor executes the computer instructions to perform the method for predistortion compensation of a chirp signal according to the first aspect or any one of the embodiments of the first aspect.
According to a third aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the method for predistortion compensation of a chirp signal described in the first aspect or any one of the implementations of the first aspect.
The technical scheme provided by the invention has the following advantages:
1. the invention provides a predistortion compensation method of linear frequency modulation signals, which is characterized in that pulse compression is carried out on linear frequency modulation signals involved in a predistortion compensation process by using a matched filtering characteristic function, continuous signals are converted into discrete points, then, the maximum amplitude value point of the signals after pulse compression is directly obtained as a pulse end point, and then a pulse start point is obtained by calculation based on the pulse end point and the number of pulse points obtained according to pulse width, so that the acquisition of pulse position information of the linear frequency modulation signals is realized.
2. The predistortion compensation method of linear frequency modulation signal provided by the invention is characterized in that two reference signals for predistortion compensation are respectively a first transmitting feedback signal and a second transmitting feedback signal, so that the amplitude predistortion amount can be obtained by calculating the ratio of the amplitude of the second pulse width signal (the pulse width part signal of the second transmitting feedback signal) to the amplitude of the first pulse width signal (the pulse width part signal of the first transmitting feedback signal), correspondingly, the amplitude of the linear frequency modulation signal to be compensated (specifically the pulse width part signal thereof, namely the pulse width signal to be compensated) is divided by the amplitude predistortion amount, thus the amplitude predistortion compensation of the linear frequency modulation signal to be compensated can be completed, the operation is simple, and the occupation of resources and the operation time can be further reduced.
3. The predistortion compensation method of linear frequency modulation signal provided by the invention is characterized in that two reference signals for predistortion compensation are respectively a first transmitting feedback signal and a second transmitting feedback signal, so that the phase angle predistortion quantity can be obtained by calculating the difference value of the phase angle of the second pulse width signal (the pulse width part signal of the second transmitting feedback signal) relative to the phase angle of the first pulse width signal (the pulse width part signal of the first transmitting feedback signal).
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a predistortion compensation method for a chirp signal according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
Fig. 1 shows a flowchart of a predistortion compensation method for a chirp signal according to an embodiment of the present invention, which may be executed by an FPGA, and specifically, as shown in fig. 1, the method may include the following steps:
s101: and acquiring the to-be-compensated linear frequency modulation signal, and a first transmission feedback signal and a second transmission feedback signal of the to-be-compensated linear frequency modulation signal.
Specifically, the first transmission feedback signal is a signal fed back by the to-be-compensated chirp signal after passing through the power divider only, and the second transmission feedback signal is a signal fed back by the to-be-compensated chirp signal after passing through the load and the power divider. Specifically, the load may be a power amplifier, a coupler, or the like.
Specifically, the chirp signal to be compensated may be generated by a chirp signal generator, and based on that the chirp signal generator further needs to transmit the chirp signal to be compensated and acquire a first transmission feedback signal and a second transmission feedback signal, the chirp signal generator further includes at least 1 transmission channel and 1 reception channel, and the chirp signal generator may be, for example, a Smart RF-301 test measurement platform.
Specifically, based on the method, the chirp signal to be compensated, the first transmission feedback signal and the second transmission feedback signal are digitally processed, so that the chirp signal to be compensated, the first transmission feedback signal and the second transmission feedback signal obtained in the step are all RF-ADC radio frequency direct sampling signals, and are signals (i.e., baseband signals) subjected to digital down-conversion, and information can be stored in an I-path and a Q-path manner.
Specifically, in this step, the signal basic parameters such as the sampling rate fs of the transmitted signal, the bandwidth Br of the chirp signal, the pulse repetition period Tr, the pulse width Tp, and the in-band spectral range RatioOfBr considered in calculating the flatness are all obtained together.
S102: pulse position information of the to-be-compensated linear frequency modulation signal, the first transmission feedback signal and the second transmission feedback signal is respectively obtained, pulse width partial signals of the to-be-compensated linear frequency modulation signal, the first transmission feedback signal and the second transmission feedback signal are correspondingly extracted according to the pulse position information, and a to-be-compensated pulse width signal, a first pulse width signal and a second pulse width signal are obtained.
Specifically, the pulse position information includes a pulse start point and a pulse end point. The pulse end point of the to-be-compensated linear frequency modulation signal is the maximum amplitude point of the signal obtained by performing pulse compression on the to-be-compensated linear frequency modulation signal based on the matched filtering characteristic function, the pulse start point of the to-be-compensated linear frequency modulation signal is obtained by calculation according to the pulse end point and the number of pulse points, and the number of the pulse points is obtained according to the pulse width. Similarly, pulse position information of the first transmit feedback signal and the second transmit feedback signal is obtained.
Specifically, aThe matched filtering characteristic function is obtained by turning the pulse pressure coefficient left and right by taking tr =0 as an axis and then performing complex conjugation, wherein the pulse pressure coefficient is as follows:where i represents a complex number, kr = Br/Tp is a modulation slope, br is a chirp signal bandwidth, tp is a pulse width, tr is a detection time range calculated from the pulse width and a sampling rate, and tr =0 represents a time axis zero point corresponding to the detection time range.
Specifically, the specific steps of performing pulse compression on the chirp signal to be compensated based on the matched filtering feature function include:
step I: and converting the linear frequency modulation signal to be compensated and the matched filtering characteristic function into a frequency domain through fast Fourier transform, and multiplying the linear frequency modulation signal to be compensated and the matched filtering characteristic function in the frequency domain to obtain a frequency domain signal after pulse pressure.
Step II: and converting the frequency domain signal after pulse pressure back to a time domain through inverse Fourier transform.
Specifically, each signal is compressed to convert the continuous signal of the bear into discrete points, and based on the characteristic that the signal with high matched filtering frequency has low delay through a filter, the maximum value point of the amplitude of the signal after pulse compression corresponds to the pulse end point (EndPointOfTp), and then the pulse start point (StartPointOfTp) can be obtained through the known pulse width converted pulse inner point number (longofstandard), and StartPointOfTp = EndPointOfTp-longofstandard +1.
It should be noted that the specific acquisition process of the pulse position information (including the pulse start point and the pulse end point) (including the calculation process of the matched filter characteristic function and the pulse compression process) may be executed in the same electronic device (such as an FPGA) as the steps S101 to S106 in the method, or may be executed in another electronic device, and the electronic device executing the steps S101 to S106 may directly acquire the pulse position information.
S103: and respectively calculating the amplitude and the phase of the pulse width signal to be compensated, the first pulse width signal and the second pulse width signal.
Specifically, based on the baseband signal, it can be expressed as:
SigY＝Sig_I+Sig_Q*i＝Sig_Abs*e (i*Sig_Angle) thus, the predistortion compensation of the chirp signal to be compensated in the time domain can be done from two dimensions, amplitude Sig _ Abs and phase Sig _ Angle.
Specifically, the amplitude Sig _ Abs and the phase Angle Sig _ Angle of each signal can be obtained by integrating the corresponding data of the pulse width signal to be compensated, the first pulse width signal and the second pulse width signal stored in the IQ form into a signal form of a real part plus an imaginary part, and then performing modulo and phase Angle calculation.
S104: and calculating the amplitude predistortion quantity of the pulse width signal to be compensated according to the amplitudes of the first pulse width signal and the second pulse width signal.
Specifically, the amplitude predistortion amount may be calculated by:
step A: and calculating the ratio of the amplitude of the second pulse width signal to the amplitude of the first pulse width signal to obtain the initial amplitude predistortion quantity. That is, the initial amplitude predistortion amount Fn is calculated as follows:
And B: and performing envelope operation on the initial amplitude predistortion quantity to obtain the amplitude predistortion quantity of the pulse width signal to be compensated. Illustratively, the local maximum value can be obtained by every 8 points, and then the amplitude predistortion quantity Fn _ Envelope after the Envelope is obtained at 8/Nr sample intervals by sample interpolation.
S105: and calculating the phase angle predistortion quantity of the pulse width signal to be compensated according to the phase angles of the first pulse width signal and the second pulse width signal.
Specifically, the amount of phase angle predistortion can be calculated by:
a, step a: and calculating the difference value of the phase angle of the second pulse width signal relative to the phase angle of the first pulse width signal to obtain the initial phase angle predistortion quantity. That is, the calculation formula of the initial phase angle predistortion amount DeltaN is as follows:
DeltaN = SigYn _ Angle-SigY1_ Angle, where SigYn _ Angle is the phase Angle of the second pulse width signal and SigY1_ Angle is the phase Angle of the first pulse width signal.
Step b: and performing envelope operation on the initial phase angle predistortion quantity to obtain the phase angle predistortion quantity of the pulse width signal to be compensated. Illustratively, local maximum values can be obtained by every 8 points, and then the phase angle predistortion amount DeltaN _ Envelope after the Envelope is obtained at 8/Nr sample intervals by sample interpolation.
S106: and respectively compensating the amplitude and the phase angle of the compensation pulse width signal according to the amplitude predistortion quantity and the phase angle predistortion quantity to obtain a compensated linear frequency modulation signal.
Specifically, the amplitude SigOut _ Abs of the compensated chirp signal is:
The phase Angle SigOut _ Angle of the compensated chirp signal is:
SigOut_Angle＝SigYn1_Angle-DeltaN_Envelope，
wherein, sigYn1_ Angle is the phase Angle of the pulse width signal to be compensated.
In the predistortion compensation method for the chirp signal in this embodiment, pulse compression is performed on the chirp signal involved in the predistortion compensation process by using a matched filtering characteristic function, a continuous signal is converted into discrete points, then, the amplitude maximum point of the signal after pulse compression is directly obtained as a pulse end point, and then, a pulse start point is obtained by calculation based on the pulse end point and the number of pulse points obtained according to a pulse width, so that the acquisition of pulse position information of the chirp signal is realized.
As an optional implementation manner of the embodiment of the present invention, on the basis of the primary predistortion compensation including the above steps S101 to S106, the predistortion compensation method for a chirp signal in the implementation manner may perform multiple predistortion compensation, specifically, as shown in fig. 1, the method further includes:
step S107: and judging whether the flatness in the working frequency band of the compensated linear frequency modulation signal is smaller than a preset value. At the moment, when the flatness in the working frequency band of the compensated linear frequency modulation signal is smaller than a preset value, the predistortion compensation is finished; when the flatness in the working frequency band of the compensated chirp signal is greater than or equal to the preset value, step S108 is executed and then steps S101 to S107 are repeated until the flatness in the working frequency band of the compensated chirp signal is less than the preset value.
Illustratively, if the initially acquired chirp signal to be compensated has an operating bandwidth of 0GHz to 1GHz, a pulse width of 20ns to 200us, and a duty ratio of 1% to 50%, the preset value may be set to 0.2dB.
Step S108: and taking the compensated linear frequency modulation signal as a linear frequency modulation signal to be compensated. Specifically, the compensated chirp signal may be mixed with a corresponding local oscillator signal to serve as the chirp signal to be compensated, and at this time, the chirp signal to be compensated needs to be transmitted after passing through the RF-DAC, so as to achieve the acquisition of the first transmit feedback signal and the second transmit feedback signal in step S101.
In the predistortion compensation method for a chirp signal in this embodiment, predistortion compensation is performed on the chirp signal repeatedly for multiple times, so that the in-band flatness of the compensated chirp signal obtained finally can be ensured.
Example 2
An electronic device according to an embodiment of the present invention is provided, and as shown in fig. 2, the electronic device may include a processor 21 and a memory 22, where the processor 21 and the memory 22 may be connected by a bus or in another manner, and fig. 2 illustrates an example of a connection by a bus.
The processor 21 may be a Central Processing Unit (CPU). The Processor 21 may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or any combination thereof.
The memory 22, which is a non-transitory computer readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the method for predistortion compensation of chirp signals in embodiment 1 of the present invention. The processor 21 executes various functional applications and data processing of the processor by executing the non-transitory software programs, instructions and modules stored in the memory 22, that is, implements the predistortion compensation method for a chirp signal in the above method embodiment 1.
The memory 22 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 21, and the like. Further, the memory 22 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 22 may optionally include memory located remotely from the processor 21, which may be connected to the processor 21 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 22 and when executed by the processor 21 perform a method of predistortion compensation of a chirp signal as in the embodiment shown in fig. 1.
The details of the electronic device may be understood with reference to the corresponding description and effects in the embodiment shown in fig. 1, and are not described herein again.
Those skilled in the art will appreciate that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium and can include the processes of the embodiments of the methods described above when executed. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (8)
1. A predistortion compensation method for linear frequency modulation signal is characterized by comprising the following steps:
acquiring a linear frequency modulation signal to be compensated, and a first transmission feedback signal and a second transmission feedback signal of the linear frequency modulation signal to be compensated; the first transmission feedback signal is a signal fed back by the to-be-compensated chirp signal after passing through a power divider only, and the second transmission feedback signal is a signal fed back by the to-be-compensated chirp signal after passing through a load and the power divider;
respectively acquiring pulse position information of the to-be-compensated linear frequency modulation signal, the first transmission feedback signal and the second transmission feedback signal, and correspondingly extracting pulse width part signals of the to-be-compensated linear frequency modulation signal, the first transmission feedback signal and the second transmission feedback signal according to the pulse position information to obtain a to-be-compensated pulse width signal, a first pulse width signal and a second pulse width signal; the pulse position information includes a pulse start point and a pulse end point; the pulse end point of the to-be-compensated linear frequency modulation signal is the maximum amplitude value point of the signal obtained by performing pulse compression on the to-be-compensated linear frequency modulation signal based on the matched filtering characteristic function, the pulse start point of the to-be-compensated linear frequency modulation signal is obtained by calculation according to the pulse end point and the number of pulse points, and the number of the pulse points is obtained according to the pulse width; similarly, obtaining pulse position information of the first transmission feedback signal and the second transmission feedback signal;
respectively calculating the amplitude and the phase of the pulse width signal to be compensated, the first pulse width signal and the second pulse width signal;
calculating the amplitude predistortion quantity of the pulse width signal to be compensated according to the amplitudes of the first pulse width signal and the second pulse width signal;
calculating the phase angle predistortion quantity of the pulse width signal to be compensated according to the phase angles of the first pulse width signal and the second pulse width signal;
and respectively compensating the amplitude and the phase angle of the pulse width signal to be compensated according to the amplitude predistortion quantity and the phase angle predistortion quantity to obtain a compensated linear frequency modulation signal.
2. The method of predistortion compensation of a chirp signal as set forth in claim 1, further comprising the steps of:
judging whether the flatness in the working frequency band of the compensated linear frequency modulation signal is smaller than the preset value or not;
and when the flatness in the working frequency band of the compensated linear frequency modulation signal is greater than or equal to the preset value, taking the compensated linear frequency modulation signal as the linear frequency modulation signal to be compensated, and repeating the compensation step until the flatness in the working frequency band of the compensated linear frequency modulation signal is less than the preset value.
3. The method for predistortion compensation of a chirp signal according to claim 1 or 2, wherein the step of calculating an amplitude predistortion amount of the pulse width signal to be compensated according to the amplitudes of the first pulse width signal and the second pulse width signal comprises:
calculating the ratio of the amplitude of the second pulse width signal to the amplitude of the first pulse width signal to obtain an initial amplitude predistortion quantity;
and performing envelope operation on the initial amplitude predistortion quantity to obtain the amplitude predistortion quantity of the pulse width signal to be compensated.
4. The method for predistortion compensation of a chirp signal according to claim 1 or 2, wherein the step of calculating the amount of phase angle predistortion of the pulse width signal to be compensated according to the phase angles of the first pulse width signal and the second pulse width signal comprises:
calculating the difference value of the phase angle of the second pulse width signal relative to the phase angle of the first pulse width signal to obtain initial phase angle predistortion quantity;
and performing envelope operation on the initial phase angle predistortion quantity to obtain the phase angle predistortion quantity of the pulse width signal to be compensated.
5. The method according to any of claims 1-4, wherein the matched filter characteristic function is obtained by left-right inverting a pulse pressure coefficient with tr =0 as an axis and then performing complex conjugate processing, wherein the pulse pressure coefficient is:
wherein i represents a complex number, kr = Br/Tp is a modulation slope, br is a chirp bandwidth, tp is a pulse width,tr is a detection time range calculated according to the pulse width and the sampling rate, and tr =0 represents a time axis zero point corresponding to the detection time range.
6. The method of claim 5, wherein the step of pulse compressing the chirp signal to be compensated based on a matched filter characteristic function comprises:
converting the linear frequency modulation signal to be compensated and the matched filtering characteristic function into a frequency domain through fast Fourier transform, and multiplying the linear frequency modulation signal to be compensated and the matched filtering characteristic function in the frequency domain to obtain a frequency domain signal after pulse pressure;
and converting the frequency domain signal after pulse pressure back to a time domain through inverse Fourier transform.
7. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method of predistortion compensation of a chirp signal as set out in any one of claims 1 to 6.
8. A computer readable storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of a method of predistortion compensation of a chirp signal as claimed in any one of claims 1 to 7.
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