CN112131525B - Method and device for synthesizing sub-band echo signals - Google Patents
Method and device for synthesizing sub-band echo signals Download PDFInfo
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Abstract
The present disclosure provides a method and apparatus for performing synthesis processing on subband echo signals. In the method, a plurality of sub-band echo signals corresponding to a specified bandwidth are obtained, Fourier transform is carried out on the obtained sub-band echo signals to obtain a plurality of sub-band time domain signals, and phase error correction is carried out on the obtained sub-band time domain signals to enable the initial phases of the sub-band time domain signals to be consistent; carrying out inverse Fourier transform on the plurality of sub-band time domain signals after the phase error correction to obtain sub-band frequency domain signals of a frequency domain; and synthesizing the sub-band frequency domain signals subjected to the Fourier inverse transformation to obtain a bandwidth synthesized signal aiming at the specified bandwidth. The synthesis processing procedure for the sub-band echo signal provided by the present disclosure cooperates with the triggering procedure of the corresponding multiple sub-band transmission signals, and constitutes a signal transceiving mechanism based on multiple sub-band signals. The signal transceiving mechanism based on the multi-subband signal improves the signal processing efficiency for the bandwidth signal.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for performing synthesis processing on subband echo signals.
Background
The security imaging device can effectively detect contraband articles hidden at each part of the human body under the clothes covering condition without directly contacting the human body of the person to be detected by utilizing the millimeter wave imaging technology, and based on the characteristic, the security imaging device is widely applied to public places such as airports, stations, courts and the like which need to carry out security inspection on the person.
Currently, during a security check operation performed by a security check imaging apparatus, an antenna disposed in the security check imaging apparatus performs periodic scanning, and in each period, a bandwidth signal for triggering the scanning of the antenna is transmitted to the antenna, and the antenna transmits an electromagnetic wave for scanning in response to the bandwidth signal and receives a feedback bandwidth resultant signal. A three-dimensional imaging device in the security inspection imaging equipment acquires the bandwidth synthesis signal to perform three-dimensional imaging processing. The conventional security imaging device always uses a large bandwidth signal with a wide frequency range to trigger the antenna to scan in each period, and enters the next period to send out the next large bandwidth signal. However, the modulation of the large bandwidth signal in the security imaging device is difficult, and the large bandwidth signal corresponds to a wide bandwidth frequency range, which results in low data acquisition efficiency and thus low security imaging device efficiency.
Disclosure of Invention
In view of the above, the present disclosure provides a method and apparatus for performing synthesis processing on subband echo signals. In the technical scheme provided by the disclosure, a plurality of sub-band echo signals corresponding to a specified bandwidth are obtained, Fourier transform is performed on the sub-band echo signals, then phase error correction is performed on the obtained plurality of sub-band time domain signals of a time domain, so that initial phases of the sub-band time domain signals are consistent, and then a bandwidth synthesis signal is obtained through inverse Fourier transform and synthesis processing. The synthesis processing process aiming at the sub-band echo signals is matched with the triggering process of the corresponding sub-band transmitting signals to complete the signal transceiving process aiming at the specified bandwidth, thereby forming a signal transceiving mechanism based on the sub-band signals. The signal transceiving mechanism based on the multi-subband signal improves the signal processing efficiency for the designated bandwidth.
According to an aspect of the present disclosure, there is provided a method for performing synthesis processing on a subband echo signal, including: acquiring a plurality of sub-band echo signals corresponding to a specified bandwidth, wherein the sub-band echo signals are echo signals of a plurality of corresponding sub-band transmitting signals, the sub-band echo signals are in one-to-one correspondence with the sub-band transmitting signals, and the signal bandwidths of the plurality of sub-band transmitting signals form the specified bandwidth; fourier transform is carried out on the obtained multiple sub-band echo signals to obtain multiple sub-band time domain signals of a time domain; carrying out phase error correction on the obtained multiple sub-band time domain signals to enable the initial phases of the sub-band time domain signals to be consistent; carrying out inverse Fourier transform on the plurality of sub-band time domain signals after the phase error correction to obtain sub-band frequency domain signals of a frequency domain; and synthesizing the sub-band frequency domain signals subjected to the inverse Fourier transform to obtain a bandwidth synthesized signal aiming at the specified bandwidth.
Optionally, in an example of the above aspect, performing phase error correction on the obtained plurality of subband time domain signals to make the initial phases of the respective subband time domain signals consistent includes: determining a reference subband time domain signal from the obtained plurality of subband time domain signals; calculating initial phase errors of other sub-band time domain signals except the reference sub-band time domain signal in the plurality of sub-band time domain signals according to the determined reference sub-band time domain signal; and correcting the phase errors of the other sub-band time domain signals according to the calculated initial phase errors so as to enable the initial phases of the sub-band time domain signals to be consistent; and performing inverse fourier transform on the plurality of sub-band time domain signals after the phase error correction to obtain sub-band frequency domain signals of a frequency domain, wherein the step of obtaining the sub-band frequency domain signals of the frequency domain comprises the following steps: and carrying out inverse Fourier transform on the sub-band time domain signal after the phase error correction and the reference sub-band time domain signal to obtain a sub-band frequency domain signal of a frequency domain.
Optionally, in one example of the above aspect, calculating an initial phase error of the other ones of the plurality of subband time domain signals other than the reference subband time domain signal from the determined reference subband time domain signal comprises: calculating initial phase errors of the reference sub-band time domain signal and each other sub-band time domain signal respectively; and performing phase error correction on the other sub-band time domain signals according to the calculated initial phase error so as to make the initial phases of the sub-band time domain signals consistent comprises: for each other sub-band time domain signal, determining a compensation factor corresponding to the sub-band time domain signal based on the initial phase error of the sub-band time domain signal; and performing phase error correction on each sub-band time domain signal by using the compensation factor corresponding to the sub-band time domain signal.
Optionally, in an example of the above aspect, performing phase error correction on the obtained plurality of subband time domain signals to make the initial phases of the respective subband time domain signals consistent includes: the clutter in each sub-band time domain signal is suppressed, and the clutter in each sub-band time domain signal comprises an interference signal generated by the inter-modulation of the sub-band time domain signal and other sub-band time domain signals; and performing phase error correction on the plurality of sub-band time domain signals after the suppression processing so as to enable the initial phases of the sub-band time domain signals to be consistent.
Optionally, in an example of the foregoing aspect, performing phase error correction on the plurality of subband time domain signals after the suppression processing so that the initial phases of the respective subband time domain signals are consistent includes: carrying out residual video phase correction on each sub-band time domain signal subjected to suppression processing; and performing phase error correction on the plurality of sub-band time domain signals subjected to the residual video phase correction so as to enable the initial phases of the sub-band time domain signals to be consistent.
Optionally, in an example of the above aspect, further comprising: and sending the obtained bandwidth synthesis signal to a three-dimensional imaging device so that the three-dimensional imaging device performs three-dimensional imaging processing according to the received bandwidth synthesis signal.
Optionally, in an example of the above aspect, further comprising: and performing data extraction on the sub-band frequency signals in the bandwidth synthesis signals according to a specified data extraction rule.
According to another aspect of the present disclosure, there is also provided an apparatus for performing synthesis processing on subband echo signals, including: the signal acquisition unit is configured to acquire a plurality of sub-band echo signals corresponding to a specified bandwidth, wherein the sub-band echo signals are echo signals of a plurality of corresponding sub-band transmitting signals, the sub-band echo signals are in one-to-one correspondence with the sub-band transmitting signals, and the signal bandwidths of the sub-band transmitting signals form the specified bandwidth; a Fourier transform unit configured to perform Fourier transform on the acquired plurality of sub-band echo signals to obtain a plurality of sub-band time-domain signals of a time domain; a phase error correction unit configured to perform phase error correction on the obtained plurality of sub-band time domain signals so that initial phases of the respective sub-band time domain signals are consistent; an inverse Fourier transform unit configured to perform inverse Fourier transform on the plurality of sub-band time-domain signals after the phase error correction to obtain sub-band frequency-domain signals of a frequency domain; and a signal synthesis unit configured to synthesize the sub-band frequency domain signals subjected to the inverse fourier transform to obtain one bandwidth synthesis signal for the specified bandwidth.
Optionally, in one example of the above aspect, the phase error correction unit includes: a reference signal determination module configured to determine one reference sub-band time-domain signal from the obtained plurality of sub-band time-domain signals; a phase error calculation module configured to calculate an initial phase error of the other sub-band time domain signals of the plurality of sub-band time domain signals except the reference sub-band time domain signal according to the determined reference sub-band time domain signal; and a first phase error correction module configured to perform phase error correction on the other sub-band time domain signals according to the calculated initial phase error so as to make the initial phases of the respective sub-band time domain signals consistent; and the inverse fourier transform unit is configured to: and carrying out inverse Fourier transform on the sub-band time domain signal after the phase error correction and the reference sub-band time domain signal to obtain a sub-band frequency domain signal of a frequency domain.
Optionally, in one example of the above aspect, the phase error calculation module is configured to: calculating initial phase errors of the reference sub-band time domain signal and each other sub-band time domain signal respectively; and the first phase error correction module is configured to: for each other sub-band time domain signal, determining a compensation factor corresponding to the sub-band time domain signal based on the initial phase error of the sub-band time domain signal; and performing phase error correction on each sub-band time domain signal by using the compensation factor corresponding to the sub-band time domain signal.
Optionally, in one example of the above aspect, the phase error correction unit includes: the clutter suppression module is configured to suppress clutter in each sub-band time domain signal, and the clutter in each sub-band time domain signal comprises an interference signal generated by inter-modulating the sub-band time domain signal with other sub-band time domain signals; and the second phase error correction module is configured to perform phase error correction on the plurality of sub-band time domain signals after the suppression processing so as to enable the initial phases of the sub-band time domain signals to be consistent.
Optionally, in one example of the above aspect, the second phase error correction module is configured to: carrying out residual video phase correction on each sub-band time domain signal subjected to suppression processing; and performing phase error correction on the plurality of sub-band time domain signals subjected to the residual video phase correction so as to enable the initial phases of the sub-band time domain signals to be consistent.
Optionally, in an example of the above aspect, further comprising: a bandwidth synthesis signal transmission unit configured to transmit the resultant bandwidth synthesis signal to a three-dimensional imaging apparatus to cause the three-dimensional imaging apparatus to perform three-dimensional imaging processing in accordance with the received bandwidth synthesis signal.
Optionally, in an example of the above aspect, further comprising: and the data extraction unit is configured to extract data of the sub-band frequency signals in the bandwidth synthesis signal according to a specified data extraction rule.
According to another aspect of the present disclosure, there is also provided an electronic device including: at least one processor; and a memory storing instructions that, when executed by the at least one processor, cause the at least one processor to perform the method for synthesis processing of sub-band echo signals as described above.
According to another aspect of the present disclosure, there is also provided a machine-readable storage medium having stored thereon executable instructions that, when executed, cause the machine to perform the method for synthesis processing of sub-band echo signals as described above.
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A further understanding of the nature and advantages of the present disclosure may be realized by reference to the following drawings. In the drawings, similar components or features may have the same reference numerals.
Fig. 1A shows a schematic diagram of an example of an application scenario of the method for synthesis processing of subband echo signals.
Fig. 1B shows a schematic diagram of another example of an application scenario of the method for synthesis processing of subband echo signals.
FIG. 2 shows a flow chart of one example of a method of the present disclosure for synthesis processing of sub-band echo signals.
Fig. 3 shows a flow chart of one example of phase error correction of the present disclosure.
FIG. 4 shows a block diagram of one example of an apparatus for synthesis processing of subband echo signals according to the present disclosure.
Fig. 5 shows a block diagram of one example of a phase error correction unit of the present disclosure.
FIG. 6 shows a block diagram of an electronic device implementing the method for synthesis processing of sub-band echo signals of the present disclosure.
Detailed Description
The subject matter described herein will be discussed with reference to example embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thereby implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as needed. In addition, features described with respect to some examples may also be combined in other examples.
As used herein, the term "include" and its variants mean open-ended terms in the sense of "including, but not limited to. The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first," "second," and the like may refer to different or the same object. Other definitions, whether explicit or implicit, may be included below. The definition of a term is consistent throughout the specification unless the context clearly dictates otherwise.
The security imaging device can effectively detect contraband articles hidden at each part of the human body under the clothes covering condition without directly contacting the human body of the person to be detected by utilizing the millimeter wave imaging technology, and based on the characteristic, the security imaging device is widely applied to public places such as airports, stations, courts and the like which need to carry out security inspection on the person.
Currently, during a security check operation performed by a security check imaging apparatus, an antenna disposed in the security check imaging apparatus performs periodic scanning, and in each period, a bandwidth signal for triggering the scanning of the antenna is transmitted to the antenna, and the antenna transmits an electromagnetic wave for scanning in response to the bandwidth signal and receives a feedback bandwidth resultant signal. A three-dimensional imaging device in the security inspection imaging equipment acquires the bandwidth synthesis signal to perform three-dimensional imaging processing. The current security check imaging device always uses one bandwidth signal to trigger the antenna to scan in each period, and enters the next period to send out the next bandwidth signal. However, the transmission efficiency of the bandwidth signal in the security imaging device is low, especially the large bandwidth signal which is not easy to transmit, resulting in the low efficiency of the security imaging device.
In view of the above, the present disclosure provides a method and apparatus for performing synthesis processing on subband echo signals. In the technical scheme provided by the disclosure, for a plurality of sub-band echo signals corresponding to a plurality of sub-band transmitting signals obtained by modulating a bandwidth signal, after the plurality of sub-band echo signals fed back by an antenna are obtained, fourier transform is performed on the plurality of sub-band echo signals, then phase error correction is performed on the plurality of sub-band time domain signals of an obtained time domain, so that initial phases of the sub-band time domain signals are consistent, and then a bandwidth synthesis signal is obtained through inverse fourier transform and synthesis processing. The synthesis processing process aiming at the sub-band echo signals is matched with a triggering mode of transmitting a plurality of sub-band transmitting signals, so that a signal receiving and transmitting mechanism is completed. The signal transceiving mechanism based on the multi-subband signal improves the signal processing efficiency for the bandwidth signal.
A method and an apparatus for performing synthesis processing on subband echo signals according to the present disclosure will be described in detail below with reference to the accompanying drawings.
The synthesis processing method provided by the disclosure can be applied to security check imaging equipment, such as radar security check imaging equipment. The security inspection imaging device at least comprises a multi-subband modulation and demodulation device, a data acquisition device and a three-dimensional imaging device. The multi-sub-band modulation and demodulation device is used for obtaining a plurality of sub-band transmitting signals through modulation and carrying out demodulation processing on sub-band echo signals corresponding to the sub-band transmitting signals. And the data acquisition processing device is used for carrying out three-dimensional imaging processing according to the bandwidth synthesis signal.
Fig. 1A shows a schematic diagram of an example of an application scenario of the method for synthesis processing of subband echo signals. As shown in fig. 1A, the security imaging apparatus at least includes a multi-subband modem device, a data acquisition device, a three-dimensional imaging device, and a processor, and the processor is connected to the multi-subband modem device and the data acquisition device, respectively. The processor may comprise any of an FPGA, GPU, CPU, ASIC, etc.
In this example, the method provided by the present disclosure may be applied to a processor in a security imaging device. Specifically, the multi-subband modem may send the demodulated subband echo signal to a processor, the processor performs the operations in the method shown in the present disclosure, and sends the synthesized bandwidth synthesized signal to a data acquisition device, the data acquisition device sends the received bandwidth synthesized signal to a three-dimensional imaging device, and the three-dimensional imaging device performs three-dimensional imaging processing according to the received bandwidth synthesized signal.
Fig. 1B shows a schematic diagram of another example of an application scenario of the method for synthesis processing of subband echo signals. As shown in fig. 1B, the security imaging apparatus includes at least a multi-subband modem device, a data acquisition device, and a three-dimensional imaging device, and in this example, the method provided by the present disclosure may be applied to the data acquisition processing device in the security imaging apparatus. Specifically, the multi-subband modem may send the demodulated subband echo signal to the data acquisition device, the data acquisition device performs the operations in the illustrated method of the present disclosure on the received subband echo signal, synthesizes the received subband echo signal to obtain a bandwidth synthesized signal, and sends the bandwidth synthesized signal to the three-dimensional imaging device, and the three-dimensional imaging device performs three-dimensional imaging processing according to the received bandwidth synthesized signal.
FIG. 2 illustrates a flow diagram of one example 200 of a method for synthesis processing of sub-band echo signals of the present disclosure.
As shown in fig. 2, at 210, a plurality of sub-band echo signals of a specified bandwidth may be acquired.
In this disclosure, the designated bandwidth corresponds to a designated frequency range, the acquired sub-band echo signals are frequency domain signals, the frequency range corresponding to the signal bandwidth of each sub-band echo signal belongs to the frequency range corresponding to the designated bandwidth, and the signal bandwidth corresponding to each sub-band echo signal may constitute the designated bandwidth.
The multiple sub-band echo signals are echo signals of multiple corresponding sub-band transmitting signals, the sub-band echo signals correspond to the sub-band transmitting signals one to one, and signal bandwidths of the multiple sub-band transmitting signals form a specified bandwidth.
For example, the frequency range of the specified bandwidth is [70GHz, 90GHz]And obtaining a 4-subband transmitting signal through modulation: r is1(f1)、r2(f2)、r3(f3) And r4(f4) Wherein r is1(f1) In the frequency range of [70GHz, 75GHz]，r2(f2) In the frequency range of [75GHz, 80GHz]，r3(f3) In the frequency range of [80GHz, 85GHz]，r4(f4) In the frequency range of [85GHz, 90GHz]. Accordingly, the number of the first and second electrodes,4 subband echo signals can be obtained:
and
wherein the content of the first and second substances,
is r1(f1) The corresponding sub-band echo signals are then transmitted,
the corresponding frequency range is [70GHz, 75GHz ]]，
Is r2(f2) The corresponding sub-band echo signals are then transmitted,
in the frequency range of [75GHz, 80GHz]，
Is r3(f3) The corresponding sub-band echo signals are then transmitted,
in the frequency range of [80GHz, 85GHz]，
Is r4(f4) The corresponding sub-band echo signals are then transmitted,
in the frequency range of [85GHz, 90GHz]。
The sub-band echo signals and the corresponding sub-band transmit signals may be transmitted through the same transmission channel. A plurality of sub-band transmit signals constituting a given bandwidth may be transmitted simultaneously to trigger a corresponding group of antenna elements to scan simultaneously, and accordingly, a plurality of sub-band echo signals corresponding to the plurality of sub-band transmit signals may be received simultaneously. Based on this, in the present disclosure, the acquired plurality of sub-band echo signals may be sub-band echo signals that are received simultaneously. In addition, in one example, a plurality of sub-band echo signals corresponding to a specified bandwidth may also be received in a time-sharing manner.
At 220, fourier transform is performed on the acquired plurality of sub-band echo signals to obtain a plurality of sub-band time-domain signals in the time domain.
The sub-band time-domain signal of the time domain obtained by Fourier transform can be represented as ri(t) of (d). Wherein i represents the number of the subband time domain signals in the time domain, i is greater than 0 and less than or equal to n, and n represents the number of the subband time domain signals in the time domain. t represents discrete time, and t can be represented as (t)min，tmin+Δt，tmin+2 Δ T, …, tmin + Nf-1 Δ tT, tmin denotes the start time point, Nf denotes the signal length, T denotes the matrix transpose, Δ T denotes the time interval, Δ T may be C/(2 · Δ f · N ·f) C represents the propagation speed of the electromagnetic wave in the air, and Δ f represents the sampling frequency of the antenna.
In one example, each sub-band echo signal of the frequency domain may be processed into a signal of a specified length. The specified length may be a length at which a signal length of the plurality of acquired sub-band echo signals is the longest, and may be larger than a length at which a signal length of the plurality of sub-band echo signals is the longest.
In one processing mode, for a subband echo signal with a signal length smaller than a specified length, the tail of the subband echo signal may be sequentially zero-padded until the length of the subband echo signal reaches the specified length.
When the signal lengths of the acquired sub-band echo signals are the same, fourier transform may be performed on the sub-band echo signals. By processing each sub-band echo signal into the same signal length, the subsequent synthesis processing of the sub-band echo signal is facilitated.
At 230, phase error correction is performed on the resulting plurality of subband time domain signals. The initial phases of the sub-band time domain signals after phase error correction are consistent, so that the coherence of the sub-band time domain signals is kept, and the sub-band frequency domain signals obtained by the sub-band time domain signals can be conveniently synthesized.
In one example, one reference signal serving as a reference may be determined, an initial phase angle between each sub-band time domain signal and the reference signal is calculated, and then each sub-band time domain signal is compensated according to the initial phase angle corresponding to each sub-band time domain signal, so that the initial phase angles between each sub-band time domain signal and the reference signal are consistent, and thus the initial phases of each sub-band time domain signal are consistent.
In one example, the reference signal may be any one of a plurality of sub-band time-domain signals of the time domain. Fig. 3 shows a flow chart of one example 300 of phase error correction of the present disclosure.
As shown in fig. 3, a reference sub-band time-domain signal may be determined 231 from the resulting plurality of sub-band time-domain signals. The determined reference subband time domain signal may be any one of a plurality of subband time domain signals. For example, the first sub-band time-domain signal r may be divided into1(t) is determined as a reference subband time domain signal.
Then, at 233, an initial phase error for the other sub-band time-domain signals can be calculated from the determined reference sub-band time-domain signal.
The other subband time domain signal may be a subband time domain signal other than the reference subband time domain signal of the plurality of subband time domain signals. For example, there are n subband time domain signals, where the first subband time domain signal r1(t) is the reference subband time domain signal, then the other subband time domain signals include: r is2(t)、r3(t)、…、rn(t)。
Specifically, the initial phase angle between the reference subband time domain signal and each of the other subband time domain signals may be calculated, and the initial phase angle corresponding to each of the other subband time domain signals may be different. The initial phase angle of each other subband time domain signal may be determined as the initial phase error of each other subband time domain signal.
For example, the reference subband time domain signal is r1(t), other sub-bandsThe domain signal is ri(t) then r1(t) and riThe initial phase angle between (t) can be expressed as angle (r)i(t)·r1(t)*) Wherein angle () represents the initial phase angle, symbol "·" represents the dot product, symbol "·" represents the conjugate operator, r1(t)*Represents a pair of r1(t) conjugation.
The other sub-band time domain signals may be phase error corrected based on the calculated initial phase error at 235 to bring the initial phase of each sub-band time domain signal into agreement.
And the initial phase of each other sub-band time domain signal after phase error correction is the same as the initial phase of the reference sub-band time domain signal, so that the initial phases of the sub-band time domain signals are consistent.
In one example, for each other subband time domain signal, after calculating the corresponding initial phase error, a corresponding compensation factor may be determined from the initial phase error. Specifically, the initial phase error of the ith subband time domain signal is
The corresponding compensation factor is
Then, the phase error correction is performed on each sub-band time domain signal by using the compensation factor corresponding to the sub-band time domain signal. Specifically, each other sub-band time domain signal may be multiplied by a corresponding compensation factor to obtain another sub-band time domain signal after phase error correction, and an initial phase of each other sub-band time domain signal is consistent with an initial phase of the reference sub-band time domain signal.
For example, for the ith subband time domain signal, the subband time domain signal is ri(t), the compensation factor of the sub-band time domain signal is
The sub-band time domain signal is subjected to phase error correction
Obtained according to the following formula:
by the above-described example of phase error correction shown in fig. 3, the reference sub-band time-domain signal is determined from the sub-band time-domain signal, calculation between each of the other sub-band time-domain signals and the reference sub-band time-domain signal is facilitated, and the sub-band time-domain signal as the reference sub-band time-domain signal can be calculated without calculation, reducing the amount of calculation.
In an example of the present disclosure, a plurality of subband echo signals that are simultaneously transmitted and received may be inter-modulated during a transmission process to generate a new frequency signal, and if the new frequency signal may interfere with the subband echo signal, for one subband echo signal, an interference signal that is inter-modulated with a different subband echo signal may be different. The clutter of each sub-band echo signal may include interference signals generated by intermodulation with other respective sub-band echo signals.
E.g. for the first sub-band time-domain signal r1(t) interfering signals Noise may be present2(t)、Noise3(t)、…、Noisei(t) wherein Noise2(t) denotes the first subband time domain signal r1(t) with a second subband time domain signal r2(t) interference signal, Noise, generated by intermodulation3(t) denotes the first subband time domain signal r1(t) and a third subband time domain signal r3(t) interference signal, Noise, generated by intermodulationi(t) denotes the first subband time domain signal r1(t) and ith subband time domain signal ri(t) inter-modulating the generated interference signal.
In this example, for the spurs in the respective sub-band time-domain signals, the spurs in the respective sub-band time-domain signals may be suppressed. In one example, clutter suppression may be performed on clutter in the respective sub-band time-domain signals using a clutter suppression filter, the clutter suppression filter may perform a clutter suppression filtering on the phase varying with the frequency component once and many times, and a transfer function of the clutter suppression filter may include a first term and a plurality of terms such as a second term, a third term, and so on.
For example, the transfer function of the clutter suppression filter may be:
wherein, cf1、cf2、……、cfiRepresenting clutter suppression nonlinear phase weighting coefficients of a filter1、a2、……、aiAnd b1、b2、……、biThe weighting coefficients representing the clutter suppression filter, for example, a set of weighting coefficients may be: a is1＝1.0000，a2＝-1.4636，a3＝4.2205，a4＝-4.4959，a5＝7.4457，a6＝-5.8318，a7＝6.7431，a8＝-3.6724，a9＝3.1268，a10＝-0.9508，a11＝0.5851；b1＝0.0131，b2＝-0.0110，b3＝0.0015，b4＝-0.0046，b5＝0.0174，b6＝-0.0174，b7＝0.0046，b8＝-0.0015，b9＝0.0110，b10＝-0.0131。
After the suppression processing, phase error correction may be performed on the plurality of sub-band time domain signals after the suppression processing, so that the initial phases of the sub-band time domain signals are consistent.
In one example of the present disclosure, in the process of transmitting a sub-band transmission signal to an antenna and feeding back a corresponding sub-band echo signal by the antenna, a secondary phase of distance correlation for the distance between the antenna and the measured object may be generated, which is a residual video phase. Residual video phase in the subband echo signals can cause resolution degradation and thus imaging blur.
In view of the above, before performing the phase error correction, the residual video phase may be performed on each sub-band time domain signal after the suppression processingAnd (6) correcting. In one example, residual video phase correction may be performed using a residual video phase correction filter, which may be expressed as: h (t) exp (-j pi · K)r·t2) Wherein, K isrIndicating the tuning frequency and t the discrete time.
After the residual video phase correction, the phase error correction may be performed on the plurality of sub-band time domain signals after the residual video phase correction, so that the initial phases of the sub-band time domain signals are consistent.
It should be noted that the residual video phase correction in the above example is applied to the sub-band time domain signal after the suppression processing, and furthermore, the residual video phase correction may be applied to the sub-band time domain signal in the time domain obtained by the fourier transform without being applied to the sub-band time domain signal after the suppression processing. At this time, when obtaining a plurality of sub-band time domain signals of the time domain through fourier transform, the plurality of sub-band time domain signals may be subjected to residual video phase correction, and then, the plurality of sub-band time domain signals subjected to residual video phase correction may be subjected to phase error correction, so that the initial phases of the respective sub-band time domain signals are made to be the same.
Through the residual video phase correction in the above example, the secondary phase for the distance can be filtered out, and the adverse effect of the distance-related secondary phase on subsequent imaging is avoided, so that the imaging effect is improved.
At 240, the plurality of sub-band time-domain signals after the phase error correction are subjected to inverse fourier transform to obtain sub-band frequency-domain signals in the frequency domain.
In the case of performing phase error correction based on the reference sub-band time domain signal, the sub-band time domain signal after the phase error correction and the reference sub-band time domain signal may be subjected to inverse fourier transform to obtain a sub-band frequency domain signal in the frequency domain.
For example, the reference subband time domain signal and the subband time domain signal after phase error correction are respectively:
inverse Fourier transform to obtain corresponding frequencyThe subband frequency domain signals of the domain are respectively:
then, at 250, the inverse fourier transformed sub-band frequency domain signals are synthesized to obtain a bandwidth synthesized signal for the specified bandwidth.
The frequency range corresponding to the signal bandwidth of the obtained bandwidth synthesis signal is the frequency range corresponding to the specified bandwidth. For example, the frequency range of the specified bandwidth is [70GHz, 90GHz ]]Frequency domain signal of sub-band
The frequency range of the signal bandwidth of (1) is 70GHz, 80GHz]Frequency domain signal of sub-band
The frequency range of the signal bandwidth of (1) is [80GHz, 90GHz]Frequency domain signal of sub-band
And
synthesizing into a bandwidth synthesized signal with a frequency range [70GHz, 90GHz ] corresponding to the signal bandwidth]。
In one example, the sub-band frequency domain signals may be synthesized in a specified order, which may be a numbering order of the plurality of sub-band transmit signals. That is, the order of combining the sub-band frequency domain signals at the time of synthesis coincides with the order of numbering of the corresponding sub-band transmission signals.
For example, N subband transmit signals are obtained by modulating one bandwidth signal, and the corresponding N subband frequency domain signals can be obtained by the embodiments of the present disclosure:
the synthesis order for the sub-band frequency domain signals is also from 1 to N. Bandwidth synthesized signal obtained after synthesisR (f) can be represented as:
in one example of the present disclosure, after obtaining the bandwidth combined signal, data extraction may be further performed on the bandwidth combined signal. Specifically, data extraction may be performed on the subband frequency signals in the bandwidth synthesis signal according to a specified data extraction rule, where a phase difference between adjacent subband frequency signals after data extraction is less than 2 pi, so that fidelity of the bandwidth synthesis signal after data extraction may be ensured, and the bandwidth synthesis signal may be used for subsequent three-dimensional imaging processing. The specified data extraction rules may include equal interval extraction, continuous extraction, non-uniform extraction, specified sample point extraction, and the like.
For example, the bandwidth synthesis signal is synthesized from N subband frequency signals, and may be extracted at equal intervals from the N subband frequency signals synthesized in sequence, where the equal interval extraction size may be 1/Nsub of the length of the subband frequency signal, and the value range of Nsub is 2 to 64, then the subband frequency signal included in the bandwidth synthesis signal after data extraction is:
wherein f is1 C、f2 C、……、fN CRepresenting the decimated frequency samples;
respectively having a signal length of
Thereby, compression of the data amount can be achieved.
By the data extraction in this example, the data amount of each bandwidth-synthesized signal can be reduced, so that the data amount at the time of imaging processing can be reduced, the data processing efficiency can be improved, and the imaging efficiency can be improved.
In one example of the present disclosure, after obtaining the bandwidth combined signal, the obtained bandwidth combined signal may be transmitted to a three-dimensional imaging apparatus, and the three-dimensional imaging apparatus performs a three-dimensional imaging process according to the received bandwidth combined signal.
In this example, the method of the present disclosure is used to synthesize and process each sub-band echo signal received simultaneously into a bandwidth synthesized signal, so that the three-dimensional imaging device is prevented from performing an operation of synthesizing and processing the sub-band echo signal, and the three-dimensional imaging device can directly receive the bandwidth synthesized signal and perform three-dimensional imaging processing according to the received bandwidth synthesized signal, thereby reducing the load of the three-dimensional imaging device and improving the efficiency of the three-dimensional imaging processing performed by the three-dimensional imaging device.
In addition, the apparatus for performing the synthesis processing operation on the subband echo signal according to the present disclosure may be different from the three-dimensional imaging apparatus, and the two apparatuses may operate in parallel, so that the three-dimensional imaging processing and the synthesis processing of the subband echo signal are performed simultaneously, improving the efficiency of synthesizing the bandwidth synthesized signal, and thus improving the efficiency of the three-dimensional imaging processing.
Fig. 4 shows a block diagram of one example of an apparatus for performing synthesis processing on subband echo signals (hereinafter referred to as a subband echo signal synthesizing apparatus 400) of the present disclosure.
As shown in fig. 4, the sub-band echo signal synthesizing apparatus 400 may include a signal acquiring unit 410, a fourier transform unit 420, a phase error correcting unit 430, an inverse fourier transform unit 440, and a signal synthesizing unit 450.
The signal acquiring unit 410 is configured to acquire a plurality of sub-band echo signals corresponding to a specified bandwidth, where the plurality of sub-band echo signals are echo signals of a corresponding plurality of sub-band transmit signals, the sub-band echo signals are in one-to-one correspondence with the sub-band transmit signals, and signal bandwidths of the plurality of sub-band transmit signals constitute the specified bandwidth. The operation of the signal acquisition unit 410 may refer to the operation of 210 in fig. 2.
The fourier transform unit 420 is configured to fourier transform the acquired plurality of sub-band echo signals, resulting in a plurality of sub-band time domain signals in the time domain. The operation of the fourier transform unit 420 may refer to the operation of 220 in fig. 2.
The phase error correction unit 430 is configured to perform phase error correction on the obtained plurality of sub-band time-domain signals so that the initial phases of the respective sub-band time-domain signals coincide. The operation of phase error correction unit 430 may refer to the operation of 230 in fig. 2.
The inverse fourier transform unit 440 is configured to perform inverse fourier transform on the plurality of sub-band time-domain signals after phase error correction, resulting in sub-band frequency-domain signals of the frequency domain. The operation of the inverse fourier transform unit 440 may refer to the operation of 240 in fig. 2.
The signal synthesis unit 450 is configured to synthesize the sub-band frequency domain signals subjected to the inverse fourier transform, resulting in one bandwidth synthesized signal for a specified bandwidth. The operation of the signal synthesizing unit 450 may refer to the operation of 250 in fig. 2.
In one example, the phase error correction unit 430 may include a spur suppression module and a second phase error correction module. The clutter suppression module is configured to perform suppression processing on clutter in each sub-band time-domain signal, where the clutter in each sub-band time-domain signal includes an interference signal generated by inter-modulating the sub-band time-domain signal with other sub-band time-domain signals. And the second phase error correction module is configured to perform phase error correction on the plurality of sub-band time domain signals after the suppression processing so as to enable the initial phases of the sub-band time domain signals to be consistent.
In one example, the second phase error correction module may be configured to: carrying out residual video phase correction on each sub-band time domain signal subjected to suppression processing; and performing phase error correction on the plurality of sub-band time domain signals subjected to the residual video phase correction so as to enable the initial phases of the sub-band time domain signals to be consistent.
In one example, the sub-band echo signal synthesizing apparatus 400 may further include a bandwidth synthesized signal transmitting unit configured to transmit the resultant bandwidth synthesized signal to the three-dimensional imaging apparatus to cause the three-dimensional imaging apparatus to perform the three-dimensional imaging process according to the received bandwidth synthesized signal.
In one example, the sub-band echo signal synthesizing apparatus 400 may further include a data extraction unit, and the data extraction unit may be configured to perform data extraction on the sub-band frequency signals in the bandwidth synthesized signal according to a specified data extraction rule.
Fig. 5 shows a block diagram of one example of a phase error correction unit 430 of the present disclosure.
As shown in fig. 5, the phase error correction unit 430 may include a reference signal determination module 431, a phase error calculation module 433, and a first phase error correction module 435.
The reference signal determination module 431 is configured to determine one reference subband time domain signal from the obtained plurality of subband time domain signals. The operation of the reference signal determination module 431 may refer to the operation of 231 in fig. 3.
The phase error calculation module 433 is configured to calculate an initial phase error of the other sub-band time domain signals of the plurality of sub-band time domain signals except the reference sub-band time domain signal according to the determined reference sub-band time domain signal. The operation of the phase error calculation module 433 may refer to the operation of 233 in fig. 3.
The first phase error correction module 435 is configured to perform phase error correction on the other sub-band time-domain signals according to the calculated initial phase error, so that the initial phases of the respective sub-band time-domain signals are consistent. The operation of the first phase error correction module 435 may refer to the operation of 235 in fig. 3. In one example, the first phase error correction module 435 and the second phase error correction module may be the same module or different modules.
In this example, the inverse fourier transform unit 440 may be further configured to: and carrying out inverse Fourier transform on the sub-band time domain signal after the phase error correction and the reference sub-band time domain signal to obtain a sub-band frequency domain signal of a frequency domain.
In one example, the phase error calculation module 433 may be configured to: and calculating initial phase errors of the reference sub-band time domain signal and each other sub-band time domain signal. The first phase error correction module 435 may be configured to: for each other sub-band time domain signal, determining a compensation factor corresponding to the sub-band time domain signal based on the initial phase error of the sub-band time domain signal; and performing phase error correction on each sub-band time domain signal by using the compensation factor corresponding to the sub-band time domain signal.
Embodiments of a method and apparatus for performing synthesis processing on subband echo signals according to embodiments of the present disclosure are described above with reference to fig. 1 to 5.
The device for synthesizing the subband echo signals according to the present disclosure may be implemented by hardware, software, or a combination of hardware and software. The software implementation is taken as an example, and is formed by reading corresponding computer program instructions in the storage into the memory for operation through the processor of the device where the software implementation is located as a logical means. In the present disclosure, the apparatus for performing synthesis processing on subband echo signals may be implemented by an electronic device, for example.
FIG. 6 illustrates a block diagram of an electronic device 600 implementing the method for synthesis processing of sub-band echo signals of the present disclosure.
As shown in fig. 6, electronic device 600 may include at least one processor 610, storage (e.g., non-volatile storage) 620, memory 630, and communication interface 640, and at least one processor 610, storage 620, memory 630, and communication interface 640 are connected together via a bus 650. The at least one processor 610 executes at least one computer-readable instruction (i.e., the elements described above as being implemented in software) stored or encoded in memory.
In one embodiment, computer-executable instructions are stored in the memory that, when executed, cause the at least one processor 610 to: acquiring a plurality of sub-band echo signals corresponding to the designated bandwidth, wherein the sub-band echo signals are echo signals of a plurality of corresponding sub-band transmitting signals, the sub-band echo signals are in one-to-one correspondence with the sub-band transmitting signals, and the signal bandwidths of the plurality of sub-band transmitting signals form the designated bandwidth; fourier transform is carried out on the obtained multiple sub-band echo signals to obtain multiple sub-band time domain signals of a time domain; carrying out phase error correction on the obtained multiple sub-band time domain signals to enable the initial phases of the sub-band time domain signals to be consistent; carrying out inverse Fourier transform on the plurality of sub-band time domain signals after the phase error correction to obtain sub-band frequency domain signals of a frequency domain; and synthesizing the sub-band frequency domain signals subjected to the Fourier inverse transformation to obtain a bandwidth synthesized signal aiming at the specified bandwidth.
It should be understood that the computer-executable instructions stored in the memory, when executed, cause the at least one processor 610 to perform the various operations and functions described above in connection with fig. 1-5 in the various embodiments of the present disclosure.
According to one embodiment, a program product, such as a machine-readable medium, is provided. A machine-readable medium may have instructions (i.e., elements described above as being implemented in software) that, when executed by a machine, cause the machine to perform various operations and functions described above in connection with fig. 1-5 in various embodiments of the disclosure.
Specifically, a system or apparatus may be provided which is provided with a readable storage medium on which software program code implementing the functions of any of the above embodiments is stored, and causes a computer or processor of the system or apparatus to read out and execute instructions stored in the readable storage medium.
In this case, the program code itself read from the readable medium can realize the functions of any of the above-described embodiments, and thus the machine-readable code and the readable storage medium storing the machine-readable code form part of the present invention.
Computer program code required for the operation of various portions of the present specification may be written in any one or more programming languages, including an object oriented programming language such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C + +, C #, VB, NET, Python, and the like, a conventional programming language such as C, Visual Basic 2003, Perl, COBOL 2002, PHP, and ABAP, a dynamic programming language such as Python, Ruby, and Groovy, or other programming languages. The program code may execute on the user's computer, or on the user's computer as a stand-alone software package, or partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any network format, such as a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet), or in a cloud computing environment, or as a service, such as a software as a service (SaaS).
Examples of the readable storage medium include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs), magnetic tapes, nonvolatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer or from the cloud via a communications network.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Not all steps and elements in the above flows and system structure diagrams are necessary, and some steps or elements may be omitted according to actual needs. The execution order of the steps is not fixed, and can be determined as required. The apparatus structures described in the above embodiments may be physical structures or logical structures, that is, some units may be implemented by the same physical entity, or some units may be implemented by a plurality of physical entities, or some units may be implemented by some components in a plurality of independent devices.
The term "exemplary" used throughout this specification means "serving as an example, instance, or illustration," and does not mean "preferred" or "advantageous" over other embodiments. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, the techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described embodiments.
Alternative embodiments of the present disclosure are described in detail with reference to the drawings, however, the embodiments of the present disclosure are not limited to the specific details in the embodiments, and various simple modifications may be made to the technical solutions of the embodiments of the present disclosure within the technical concept of the embodiments of the present disclosure, and the simple modifications all belong to the protective scope of the embodiments of the present disclosure.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. A method for synthesis processing of sub-band echo signals, comprising:
acquiring a plurality of sub-band echo signals corresponding to a specified bandwidth, wherein the sub-band echo signals are echo signals of a plurality of corresponding sub-band transmitting signals, the sub-band echo signals are in one-to-one correspondence with the sub-band transmitting signals, and the signal bandwidths of the plurality of sub-band transmitting signals form the specified bandwidth;
fourier transform is carried out on the obtained multiple sub-band echo signals to obtain multiple sub-band time domain signals of a time domain;
determining a reference subband time domain signal from the obtained plurality of subband time domain signals;
calculating the time domain signal of the reference sub-band with each other sub-bandAn initial phase error of the domain signal, wherein the initial phase angle of each of the other subband time domain signals is: angle (r)i(t)·r1(t)*) Determining an initial phase angle of each other sub-band time domain signal as an initial phase error of each other sub-band time domain signal;
correcting the phase errors of the other sub-band time domain signals according to the calculated initial phase errors so as to enable the initial phases of the sub-band time domain signals to be consistent;
carrying out inverse Fourier transform on the sub-band time domain signal after the phase error correction and the reference sub-band time domain signal to obtain a sub-band frequency domain signal of a frequency domain; and
and synthesizing the sub-band frequency domain signals subjected to the Fourier inverse transformation to obtain a bandwidth synthesized signal aiming at the specified bandwidth.
2. The method of claim 1, wherein,
performing phase error correction on the other sub-band time domain signals according to the calculated initial phase error so that the initial phases of the sub-band time domain signals are consistent comprises:
for each other sub-band time domain signal, determining a compensation factor corresponding to the sub-band time domain signal based on the initial phase error of the sub-band time domain signal; and
and performing phase error correction on each sub-band time domain signal by using the corresponding compensation factor of the sub-band time domain signal.
3. The method of claim 1, wherein prior to determining a reference subband time domain signal from the derived plurality of subband time domain signals, further comprising:
and carrying out suppression processing on the clutter in each sub-band time domain signal, wherein the clutter in each sub-band time domain signal comprises an interference signal generated by the inter-modulation of the sub-band time domain signal and other sub-band time domain signals.
4. The method of claim 3, further comprising:
and carrying out residual video phase correction on each sub-band time domain signal subjected to the suppression processing.
5. The method of claim 1, further comprising:
and sending the obtained bandwidth synthesis signal to a three-dimensional imaging device so that the three-dimensional imaging device performs three-dimensional imaging processing according to the received bandwidth synthesis signal.
6. The method of claim 1, further comprising:
and performing data extraction on the sub-band frequency signals in the bandwidth synthesis signals according to a specified data extraction rule.
7. An apparatus for synthesis processing of sub-band echo signals, comprising:
the signal acquisition unit is configured to acquire a plurality of sub-band echo signals corresponding to a specified bandwidth, wherein the sub-band echo signals are echo signals of a plurality of corresponding sub-band transmitting signals, the sub-band echo signals are in one-to-one correspondence with the sub-band transmitting signals, and the signal bandwidths of the sub-band transmitting signals form the specified bandwidth;
a Fourier transform unit configured to perform Fourier transform on the acquired plurality of sub-band echo signals to obtain a plurality of sub-band time-domain signals of a time domain;
a phase error correction unit configured to perform phase error correction on the obtained plurality of sub-band time domain signals so that initial phases of the respective sub-band time domain signals are consistent;
an inverse Fourier transform unit configured to perform inverse Fourier transform on the plurality of sub-band time-domain signals after the phase error correction to obtain sub-band frequency-domain signals of a frequency domain; and
a signal synthesis unit configured to synthesize the sub-band frequency domain signals subjected to the inverse Fourier transform to obtain one bandwidth synthesized signal for the specified bandwidth,
wherein the phase error correction unit includes:
a reference signal determination module configured to determine one reference sub-band time-domain signal from the obtained plurality of sub-band time-domain signals;
a phase error calculation module configured to calculate an initial phase error between the reference sub-band time-domain signal and each of the other sub-band time-domain signals, where an initial phase angle of each of the other sub-band time-domain signals is: angle (r)i(t)·r1(t)*) Determining an initial phase angle of each other sub-band time domain signal as an initial phase error of each other sub-band time domain signal; and
a first phase error correction module configured to perform phase error correction on the other sub-band time domain signals according to the calculated initial phase error so as to make the initial phases of the sub-band time domain signals consistent; and
the inverse Fourier transform unit is configured to:
and carrying out inverse Fourier transform on the sub-band time domain signal after the phase error correction and the reference sub-band time domain signal to obtain a sub-band frequency domain signal of a frequency domain.
8. The apparatus of claim 7, wherein the first phase error correction module is configured to:
for each other sub-band time domain signal, determining a compensation factor corresponding to the sub-band time domain signal based on the initial phase error of the sub-band time domain signal; and
and performing phase error correction on each sub-band time domain signal by using the corresponding compensation factor of the sub-band time domain signal.
9. The apparatus of claim 7, wherein the phase error correction unit comprises:
the clutter suppression module is configured to suppress clutter in each sub-band time domain signal, and the clutter in each sub-band time domain signal comprises an interference signal generated by inter-modulating the sub-band time domain signal with other sub-band time domain signals; and
and the second phase error correction module is configured to perform phase error correction on the plurality of sub-band time domain signals after the suppression processing so as to enable the initial phases of the sub-band time domain signals to be consistent.
10. The apparatus of claim 9, wherein the second phase error correction module is configured to:
carrying out residual video phase correction on each sub-band time domain signal subjected to suppression processing; and
and performing phase error correction on the plurality of sub-band time domain signals subjected to the residual video phase correction so as to enable the initial phases of the sub-band time domain signals to be consistent.
11. The apparatus of claim 7, further comprising:
a bandwidth synthesis signal transmission unit configured to transmit the resultant bandwidth synthesis signal to a three-dimensional imaging apparatus to cause the three-dimensional imaging apparatus to perform three-dimensional imaging processing in accordance with the received bandwidth synthesis signal.
12. The apparatus of claim 7, further comprising:
and the data extraction unit is configured to extract data of the sub-band frequency signals in the bandwidth synthesis signal according to a specified data extraction rule.
13. An electronic device, comprising:
at least one processor, and
a memory coupled with the at least one processor, the memory storing instructions that, when executed by the at least one processor, cause the at least one processor to perform the method of any of claims 1-6.
14. A machine-readable storage medium storing executable instructions that, when executed, cause the machine to perform the method of any of claims 1 to 6.
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