CN113050101A - Coherent signal receiving device, method and coherent detection system - Google Patents
Coherent signal receiving device, method and coherent detection system Download PDFInfo
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Abstract
The invention discloses a coherent signal receiving device, comprising: a receive array comprising a plurality of array elements for generating respective first signals of a polarity based on the received coherent signals; and each signal processing unit is connected with one or more associated array units and is used for carrying out depolarization processing on the corresponding first signal or a superposed signal of the plurality of first signals according to a preset rule to obtain a second signal. The invention also discloses a coherent detection system and a coherent signal receiving method. The first signals with polarity received by the receiving array are processed uniformly according to a preset rule, so that the generated second signals can shield the influence of some interference factors from multiple angles and layers, the loss of the signals is reduced, the total output of the coherent signal receiving device is improved, and the detection efficiency can be improved.
Description
Technical Field
The present disclosure relates to the field of coherent detection technologies, and in particular, to a coherent signal receiving apparatus, a coherent signal receiving method, and a coherent detection system.
Background
Coherent detection is that echo signals and local oscillation light are mixed to output difference frequency components of the echo signals and the local oscillation light, and then the difference frequency components are absorbed by a detector to generate light current, wherein the difference frequency components retain amplitude, frequency and phase information of the echo signals, and holographic detection of the echo signals is realized. Compared with direct detection, the method has the advantages of strong detection capability, high conversion gain, high signal-to-noise ratio, strong anti-interference capability and the like, and is widely applied to the fields of coherent light communication, remote sensing, laser radar speed measurement, distance measurement and the like.
However, signals received by the detector come from different parts of a target, so that echo phase fluctuates, multiple echo signals and local oscillation light interfere on the surface of the detector, and when the detector absorbs the interference signals, current distribution generated by the detector fluctuates positively and negatively, so that positive and negative cancellation is caused, and the total optical heterodyne signal is reduced. Particularly, when the target surface is rough, the unevenness of the target surface randomly fluctuates, so that the positive and negative of the current on the detector are randomly distributed, and the photocurrent output after the positive and negative are cancelled is seriously reduced, thereby influencing the detection efficiency.
Also, the above series of problems are encountered when receiving coherent signals.
In view of the above, a coherent signal processing scheme is needed to solve the above problems.
Disclosure of Invention
The present disclosure is proposed to solve the above technical problems. The embodiment of the disclosure provides a coherent signal receiving device, a coherent detection system and a coherent signal receiving method.
According to an aspect of the embodiments of the present disclosure, there is provided a coherent signal receiving apparatus, including:
a receive array comprising a plurality of array elements for generating respective first signals of a polarity based on the received coherent signals;
and each signal processing unit is connected with one or more associated array units and is used for carrying out depolarization processing on the corresponding first signal or a superposed signal of the plurality of first signals according to a preset rule to obtain a second signal.
In an embodiment of the present disclosure, the preset rule includes:
performing even power processing on the first signal or a superposed signal of a plurality of first signals to obtain a second signal; or
And obtaining the second signal by taking an absolute value of a superposed signal of the first signal or the plurality of first signals.
In an embodiment of the present disclosure, the apparatus further includes an output unit, communicatively connected to at least part of the signal processing circuit, and configured to output a third signal after superimposing input signals including at least part of the second signal.
In an embodiment of the present disclosure, the apparatus further includes a determining module, configured to determine, based on a preset function and a preset parameter, a polarity of each of the first signals to obtain a determination result, where the determination result is used to indicate a division of a plurality of associated array units and/or whether each of the signal processing units performs a depolarization process.
In an embodiment of the present disclosure, the determining result is used to indicate whether each of the signal processing units performs a depolarization process, and the determining result includes:
and when the polarity of the first signal is not the preset polarity, the corresponding signal processing unit carries out the depolarization processing according to a preset rule, otherwise, the signal processing unit does not execute the depolarization processing.
In an embodiment of the present disclosure, the plurality of associated array units includes any one of:
a plurality of array units with the same polarity in the receiving array;
a row or a portion of a row of the receive array;
a column or a portion of a column of the receive array;
the area of the receiving array comprises more than three array units.
According to another aspect of the embodiments of the present disclosure, there is also provided a coherent detection system. The system comprises:
the signal transmitting device is used for transmitting a detection signal, one part of the detection signal is used for generating an echo signal after being reflected by a detection target, and the other part of the detection signal is used as a local oscillation signal to enter the coherent signal receiving device and is used for interfering with the echo signal to generate a coherent signal;
coherent signal receiving means as claimed in any one of the above for generating a corresponding third signal based on the received coherent signal;
and the processing device is used for obtaining the related information of the detection target based on the third signal.
According to another aspect of the embodiments of the present disclosure, there is also provided a coherent signal receiving method, including:
receiving a plurality of coherent signals and generating a corresponding plurality of first signals having a polarity based on the received coherent signals;
and performing depolarization processing on the corresponding first signal or the superposed signal of the plurality of first signals according to a preset rule to obtain a second signal.
In an embodiment of the present disclosure, the preset rule includes:
performing even power processing on the first signal or a superposed signal of a plurality of first signals to obtain a second signal; or
And obtaining the second signal by taking an absolute value of a superposed signal of the first signal or the plurality of first signals.
In an embodiment of the present disclosure, the method further includes:
and outputting a third signal after superposing the input signals including at least part of the second signal.
In an embodiment of the present disclosure, the method further includes:
and judging the polarity of each first signal based on a preset function and preset parameters to obtain a judgment result, wherein the judgment result is used for indicating the division of a plurality of related array units and/or whether to execute the depolarization processing.
In an embodiment of the present disclosure, the determining result is used to instruct each of the signal processing units whether to perform the depolarization processing, and the determining result includes:
and when the polarity of the first signal is not the preset polarity, performing the depolarization processing according to a preset rule, otherwise, not performing the depolarization processing.
Based on the coherent signal receiving device, the coherent signal receiving method and the coherent detection system using the device provided by the embodiments of the present disclosure, the plurality of polarized first signals received by the receiving array are uniformly processed according to the preset rule, so that the generated signals can shield the influence of some interference factors from various angles and in multiple layers, the loss of the signals is reduced, the total output of the coherent signal receiving device is improved, and the detection efficiency can be improved.
The technical solution of the present disclosure is further described in detail by the accompanying drawings and examples.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1-1 is a schematic diagram of one embodiment of a coherent signal receiving apparatus of the present disclosure;
fig. 1-2 are schematic diagrams of another embodiment of a coherent signal receiving apparatus of the present disclosure;
fig. 2 is a schematic diagram of a coherent signal receiving apparatus according to yet another embodiment of the present disclosure;
fig. 3 is a schematic diagram of a detector area array of the coherent signal receiving apparatus of the present disclosure;
fig. 4 is another schematic diagram of a detector area array of the coherent signal receiving apparatus of the present disclosure;
fig. 5 is still another schematic diagram of a detector area array of the coherent signal receiving apparatus of the present disclosure;
fig. 6 is a schematic diagram of an optical path system of a square bin of the coherent signal receiving device of the present disclosure;
fig. 7 is a diagram of a change of a detector area array current curve of the coherent signal receiving device of the present disclosure;
fig. 8 is a schematic diagram of a detector area array current curve integral of the coherent signal receiving apparatus of the present disclosure;
fig. 9 is a schematic view of the current of the area element module in the detector area array of the coherent signal receiving device of the present disclosure;
FIG. 10 is another schematic diagram of the area element module current in the detector area array of the coherent signal receiving apparatus of the present disclosure
FIG. 11 is a diagram illustrating the variation of the integrated current with the size of the detector
FIG. 12 is a schematic diagram of the integrated current of the coherent signal receiver of the present disclosure as a function of detector size;
FIG. 13 is a schematic diagram of one embodiment of a coherent detection system of the present disclosure;
fig. 14 is a flowchart of a coherent signal receiving method according to an embodiment of the disclosure.
Detailed Description
Example embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the embodiments of the present disclosure and not all embodiments of the present disclosure, with the understanding that the present disclosure is not limited to the example embodiments described herein.
It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
It will be understood by those of skill in the art that the terms "first," "second," and the like in the embodiments of the present disclosure are used merely to distinguish one element from another, and are not intended to imply any particular technical meaning, nor is the necessary logical order between them.
It is also understood that in embodiments of the present disclosure, "a plurality" may refer to two or more than two and "at least one" may refer to one, two or more than two.
It is also to be understood that any reference to any component, data, or structure in the embodiments of the disclosure, may be generally understood as one or more, unless explicitly defined otherwise or stated otherwise.
In addition, the term "and/or" in the present disclosure is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, such as a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in the present disclosure generally indicates that the former and latter associated objects are in an "or" relationship.
It should also be understood that the description of the various embodiments of the present disclosure emphasizes the differences between the various embodiments, and the same or similar parts may be referred to each other, so that the descriptions thereof are omitted for brevity.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Embodiments of the present disclosure may be implemented in electronic devices such as terminal devices, computer systems, servers, etc., which are operational with numerous other general purpose or special purpose computing system environments or configurations. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with an electronic device, such as a terminal device, computer system, or server, include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, microprocessor-based systems, set top boxes, programmable consumer electronics, network pcs, minicomputer systems, mainframe computer systems, distributed cloud computing environments that include any of the above, and the like.
Electronic devices such as terminal devices, computer systems, servers, etc. may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, etc. that perform particular tasks or implement particular abstract data types. The computer system/server may be implemented in a distributed cloud computing environment. In a distributed cloud computing environment, tasks may be performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules may be located in both local and remote computer system storage media including memory storage devices.
Summary of the disclosure
The inventors have found that there are some problems in receiving a coherent signal and in a series of processes after reception, and these problems cause a decrease in detection efficiency when studying coherent detection. For example, signals received by the detector come from different parts of a target, so that the phase of echoes fluctuates, multiple echo signals interfere with local oscillation light on the surface of the detector, and when the detector absorbs the interference signals, the current distribution generated by the detector fluctuates positively and negatively, so that positive and negative cancellation is triggered, and the total optical heterodyne signal is reduced. Particularly, when the target surface is rough, the unevenness of the target surface randomly fluctuates, so that the positive and negative of the current on the detector are randomly distributed, and the photocurrent output after the positive and negative are cancelled is seriously reduced, thereby influencing the detection efficiency. Moreover, the inventors have found that the reception of coherent signals suffers from the above-mentioned series of problems. On the basis, the inventor further considers that the coherent signal receiving and coherent detection system are researched and found, and then provides the scheme.
Brief description of the drawings
The coherent signal receiving apparatus of the present invention will be further described with reference to the accompanying drawings and specific embodiments.
An example of a coherent signal receiving apparatus provided in the present disclosure is shown in fig. 1. A coherent signal receiving apparatus 100 includes a receiving array 120 and at least one signal processing unit 140.
Wherein the receive array 120 comprises a plurality of array elements for generating respective polarized first signals based on the received coherent signals. Each of the signal processing units 140 is connected to one or more associated array units, and is configured to perform a depolarization processing on the corresponding first signal or a superposition signal of a plurality of the first signals according to a preset rule to obtain a second signal. Referring to fig. 1, the signal processing units 140 are respectively connected to an array unit, and each signal processing unit is configured to perform a depolarization process on the first signal generated by the corresponding array unit. Referring to fig. 2, the signal processing unit 140 may further be connected to a group of array units having an association for performing a de-polarization process on the superimposed new numbers generated by the group of array units.
It should be noted that the coherent signals for which the solution proposed herein is directed may include electromagnetic wave signals or acoustic wave signals. The electromagnetic wave signal involved therein may include at least one of radio waves, microwaves, infrared rays, visible light, ultraviolet rays, x-rays, and gamma rays.
A plurality of first signals with polarity received by the receiving array are processed uniformly according to a preset rule, so that the generated signals can avoid the situation that the total electric signals are reduced when the electric signals with different polarities are superposed and output, the phenomenon of fading coherence is inhibited, the loss of the signals is reduced, the total output of a coherent signal receiving device is improved, and the detection efficiency can be improved.
And through the processing of the preset rule, the first signal with polarity is subjected to polarity removal processing to obtain a second signal. The preset rule may be: performing even power processing on the first signal or a superposed signal of a plurality of first signals to obtain a second signal; or taking an absolute value of the first signal or a superposition signal of a plurality of first signals to obtain the second signal. The depolarization processing is completed through processing of a preset rule.
On this basis, referring to fig. 2, the coherent signal receiving apparatus 200 may further include an output unit 160, where the output unit 160 is communicatively connected to at least a part of the signal processing circuit 140, and is configured to output a third signal after superimposing the input signal including at least a part of the second signal. The signal of the input-output unit 160 may include only the second signal, or may include both the first signal and the second signal.
On this basis, the coherent signal receiving apparatus 100 may further include a determining module 180, configured to determine the polarity of each of the first signals based on a preset function and a preset parameter to obtain a determination result, where the determination result may be used to indicate the division of the multiple associated array units and/or whether each of the signal processing units performs the depolarization processing. Taking the coherent signal as an optical signal as an example, the preset parameters may include: the optical system comprises a transmitting light wavelength, a target detection distance, a signal light amplitude, a local oscillator light amplitude and a lens focal length.
The above determination result may be used to indicate the division of the plurality of associative array units. For example, when the polarities of the determination results are the same, the array cells may be divided into associated array cells. The plurality of associated array units may include any one of: a plurality of array units with the same polarity in the receiving array; a row or a portion of a row of the receive array; a column or a portion of a column of the receive array; the area of the receiving array comprises more than three array units.
The determination result may be used to indicate whether each of the signal processing units performs a depolarization process. For example, when the polarity of the first signal is not the preset polarity, the corresponding signal processing unit performs the depolarization processing according to the preset rule, otherwise, the depolarization processing is not performed. Thus, the polarity of the first signal can be known, and when the polarity is not preset to be acquired, the depolarization processing is performed. The specific manner of the depolarization processing may be performed in the manner of the depolarization processing described above.
On this basis, still disclose a coherent detection system, include: signal transmitting device, coherent signal receiving device and processing device.
The signal transmitting device is used for transmitting a detection signal, wherein one part of the detection signal is used for generating an echo signal after being reflected by a detection target, and the other part of the detection signal is used as a local oscillation signal to enter the coherent signal receiving device and is used for interfering with the echo signal to generate a coherent signal; and the above-mentioned coherent signal receiving means, are used for producing the corresponding third signal on the basis of the coherent signal received; and the processing device is used for obtaining the related information of the detection target based on the third signal. Wherein the relevant information here comprises speed and/or distance information.
Through depolarization processing of the coherent signal receiving device on the received signal, influence of interference factors can be shielded from multiple angles in a multi-level mode, loss of the signal is reduced, total output of the coherent signal receiving device is improved, and detection efficiency can be improved.
Exemplary devices
For better understanding of the present solution, the following describes the present solution in further detail by taking a coherent signal as an optical signal as an example. However, it should be noted that the coherent signal is an optical signal, which is only an exemplary illustration and not a limitation of the coherent signal, and other coherent signals in the art are within the protection scope of the present disclosure.
The optical signal transmitting device transmits a detection signal, one part of the detection signal is reflected by a detection target to generate an echo signal, and the other part of the detection signal is used as a local oscillation signal to enter the coherent signal receiving device and is used for interfering with the echo signal to generate a coherent signal.
The receiving array of the coherent signal receiving device may be a detector area array, and the corresponding array unit may be a surface element or a pixel in the detector area array. Wherein the bins may comprise at least one picture element. Referring to fig. 3 and 4, the detector area array includes a plurality of pixels, wherein a bin includes one pixel. As shown in fig. 5, the detector array includes a plurality of bins, wherein the bins include a plurality of pixels.
Regarding the division of the detector area array, as shown in fig. 4 and 5, a central surface element or a pixel element may be set with the central point of the detector area array as the center, and the whole area array may be divided outward based on the central surface element or the pixel element in turn according to a preset size; or as shown in fig. 3, the central point of the detector area array is taken as a common vertex of a plurality of central surface elements or pixels, and the whole detector area array is divided outwards according to a preset size based on the plurality of central surface elements or pixels.
Regarding the division of the bins or the pixels, the division of the areas can be performed according to the current distribution in the detector area array, and the areas of the bins or the pixels are controlled in the areas with the same current direction. Regarding the shape of the surface element or the pixel, considering the manufacturing process and saving the array area, the detector area array is mostly divided into square pixels, and the side length of the square pixels is less than or equal to the maximum distance corresponding to the phase change of the integrated current in the detector area array.
The following takes a square pixel or a bin as an example, and further explains how to judge the polarity of the pixel or the bin and how to perform depolarization.
Fig. 6 is a diagram showing an optical path system of a square pixel. The light emitted from the point A and the point O on the target is irradiated to the surface of the detector through the optical receiving system. L is the distance between the O point of the target object and the receiving system, L1The optical path from the optical receiving system to the detector surface at point O, i.e. the focal length of the optical receiving system, d is the optical path from the light emitted from point A to the receiving system, d1Is the optical path from the optical receiving system to the detector surface of point A, and the distance from point A to the optical axis is
The distance from the corresponding image point A' on the detector to the optical axis
The optical path difference between the two light rays is:
Δ＝d+d1-L-L1(formula 1)
The method is simplified and can be obtained:
neglecting the time characteristic, substituting the above formula into the formula
ωIFThe available current is 0:
when the wavelength is lambda, the detection distance is L, and the signal light amplitude is AsAmplitude of local oscillator light is AlDistance L from lens to detection plane1When the current distribution is determined, the current distribution of the detector area array can be obtained according to the formula 3.
Fig. 7 is a diagram of a change of current in a detector area array along with a radius R, where it can be seen that when the radius of the detector area array is within a certain range, the directions of currents generated by signal light and local oscillator light are the same, then the directions of the currents are opposite, the directions of the currents show periodic changes along with the increase of the radius of the area array, and the change frequency increases along with the increase of the radius.
As shown in fig. 8, the final output current of the detector area array and the size of the detector surface area can be obtained by integrating the current distribution curve. The integrated current, i.e. the final output current, decreases with increasing integration size. The main reason is that when the integral is square, the more the integral four right-angle sides cut the circular interference fringes with the increase of the integral area, the more the current is cut, the more the positive and negative are cancelled, and therefore the integral signal amplitude does not reach the maximum value of the first amplitude. As can be seen in fig. 8, as the detector size increases, the integrated current gradually rises from zero to the first maximum value, indicating that the direction of current flow is the same within that size range, and the output current increases as the size increases, but begins to fall after the maximum value, indicating that the current flow is in the opposite direction within a further increasing size range, resulting in a decrease in integrated current flow with further increase in size. Therefore, the positive and negative of each bin or pixel can be obtained by integrating the area of the bin or pixel according to equation 3 (refer to fig. 9 or 10).
As shown in fig. 9, the wavelength λ is 905nm, the detection distance L is 200m, and the signal light amplitude is as5mW, local oscillator amplitude Al10mW, focal length L of distance from lens to detection plane1When the pixel size is 1.25um × 1.25um, positive and negative currents are distributed on each pixel at 0.030 m.According to a preset rule, the positive currents and the negative currents can be added respectively to obtain a total I (+) and a total I (-) and then the total I (-) is reversed to obtain a total output current, so that the total output current on the area array is improved. Or respectively processed by even power and then added, thereby obtaining the total output current.
The depolarization processing has more practical effect and significance in practical operation.
For example, in the actual detection process, since the target object often has a certain roughness rather than a smooth surface, the following embodiment provides a rough surface target object detection implementation process.
The optical path difference of two light rays of the rough surface is delta d + d1-L-L1+ h (x, y) (formula 4)
h (x, y) is a rough surface distribution function, a detected square with the pixel size of 20um is set, the center of the pixel is taken as a 0 point, and coordinates at a position away from the pixel R1 are respectively
Carry over to formula 4 to
Neglecting the time characteristic, substituting the above formula into the formula
ωIFThe available current is 0:
and integrating the current in the x and y directions in the detection plane to obtain the final output current integral. As shown in FIG. 11, it can be seen from this figure that in the case of influence of rough surface, the integrated current has a change in amplitude with the change in the size of the detector, and the positive and negative of the current no longer appear regular as on the smooth surfaceThe period is changed. At this time, if the current direction is processed in the same direction, if the negative current is reversed, the obtained integrated current curve along with the size of the detector is shown in fig. 12, and the magnitude of the output current is 10 shown in fig. 11-12Is lifted to 10-9The method improves 3 orders of magnitude, and is beneficial to improving the signal-to-noise ratio and the detection efficiency.
In this case, the difficulty of judging whether the surface element or the pixel element is positive or negative increases in the area array, as shown in fig. 10. Therefore, the rule of depolarization at this time is preferably to perform even power processing on the output current of each bin or pixel, such as squaring and outputting; or the absolute value of the output current of each surface element or pixel is taken and then uniformly added to improve the output current.
Further, since the current itself has positive and negative offsets within each pixel, it is the final output current that is actually the sum of the integrated currents over each pixel. Therefore, the output current of each surface element or pixel can be further improved by reducing the positive and negative offsets in the surface elements or pixels, and the total output current of the whole area array is further improved.
In order to reduce the positive and negative offset in the pixel, the regions with the same current direction need to be divided into one pixel as much as possible, so that the current proportion with different directions is reduced, and the area of the pixel is reduced, which is favorable for realizing the requirement. Preferably, the bin or pixel edge length can be controlled to be less than or equal to the maximum distance corresponding to the integrated current phase change pi/2 in the detector area array. Since the change frequency of the integrated current increases with the increase of the size of the detector, the distance corresponding to the phase change pi/2 of the integrated current is shorter and shorter, and as shown in fig. 8, the maximum distance is the center of the detector area array, and the distance is D.
Therefore, the depolarization processing coherent signal receiving device provided by the scheme has a very obvious effect in actual operation, can be combined with different environments, can select different depolarization modes, and has high practicability.
Exemplary method
Based on the same design concept as the coherent signal receiving device, a coherent signal receiving method is also provided. The method comprises the following steps:
step S120: receiving a plurality of coherent signals and generating a corresponding plurality of first signals having a polarity based on the received coherent signals;
step S140: and performing depolarization processing on the corresponding first signal or the superposed signal of the plurality of first signals according to a preset rule to obtain a second signal.
The processing rule regarding the depolarization may include: performing even power processing on the first signal or a superposed signal of a plurality of first signals to obtain a second signal; or taking an absolute value of the first signal or a superposition signal of a plurality of first signals to obtain the second signal.
On the basis of the above, the method further comprises: and outputting a third signal after superposing the input signals including at least part of the second signal.
On the basis, the method further comprises the following steps: and judging the polarity of each first signal based on a preset function and preset parameters to obtain a judgment result, wherein the judgment result is used for indicating the division of a plurality of related array units and/or whether each signal processing unit executes the depolarization processing.
When the judgment result is used for indicating whether each signal processing unit executes the depolarization processing, the method comprises the following steps: and when the polarity of the first signal is not the preset polarity, the corresponding signal processing unit carries out the depolarization processing according to a preset rule, otherwise, the signal processing unit does not execute the depolarization processing.
When the judgment result is used for indicating the division of the plurality of related array units, the method comprises the step of setting the array units with the same polarity as the related array units. The plurality of associated array units described above, comprising any of: a plurality of array units with the same polarity in the receiving array; a row or a portion of a row of the receive array; a column or a portion of a column of the receive array; the area of the receiving array comprises more than three array units.
The depolarization processing of the received signal by the coherent signal receiving method can shield the influence of some interference factors from various angles in a multi-level manner, reduce the loss of the signal, improve the total output of the coherent signal receiving device and improve the detection efficiency.
The foregoing describes the general principles of the present disclosure in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present disclosure are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present disclosure. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the disclosure is not intended to be limited to the specific details so described.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The block diagrams of devices, apparatuses, systems referred to in this disclosure are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, and systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," comprising, "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
The methods and apparatus of the present disclosure may be implemented in a number of ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
It is also noted that in the devices, apparatuses, and methods of the present disclosure, each component or step can be decomposed and/or recombined. These decompositions and/or recombinations are to be considered equivalents of the present disclosure.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects, and the like, will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the disclosure to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (12)
1. A coherent signal receiving apparatus, comprising:
a receive array comprising a plurality of array elements for generating respective first signals of a polarity based on the received coherent signals;
and each signal processing unit is connected with one or more associated array units and is used for carrying out depolarization processing on the corresponding first signal or a superposed signal of the plurality of first signals according to a preset rule to obtain a second signal.
2. The apparatus of claim 1, wherein the preset rule comprises:
performing even power processing on the first signal or a superposed signal of a plurality of first signals to obtain a second signal; or
And obtaining the second signal by taking an absolute value of a superposed signal of the first signal or the plurality of first signals.
3. The apparatus of claim 1 or 2, further comprising a third signal output in communication with at least a portion of the signal processing circuitry for superimposing an input signal comprising at least a portion of the second signal.
4. The apparatus according to claim 1, further comprising a determining module, configured to determine a polarity of each of the first signals based on a preset function and a preset parameter to obtain a determination result, where the determination result is used to indicate a division of a plurality of associated array units and/or whether each of the signal processing units performs a depolarization process.
5. The apparatus according to claim 4, wherein the determination result is used for indicating whether each of the signal processing units performs a depolarization process, and the determination result includes:
and when the polarity of the first signal is not the preset polarity, the corresponding signal processing unit carries out the depolarization processing according to a preset rule, otherwise, the signal processing unit does not execute the depolarization processing.
6. The apparatus of any of claims 1 to 5, the plurality of associated array units comprising any of:
a plurality of array units with the same polarity in the receiving array;
a row or a portion of a row of the receive array;
a column or a portion of a column of the receive array;
the area of the receiving array comprises more than three array units.
7. A coherent detection system comprising:
a signal transmitting device, configured to transmit a probe signal, where a part of the probe signal is used to generate an echo signal after being reflected by a probe target, and another part of the probe signal enters the coherent signal receiving device according to any one of claims 1 to 8 as a local oscillation signal, and is used to generate a coherent signal by interfering with the echo signal;
a coherent signal receiving apparatus as claimed in any one of claims 1 to 8, arranged to generate a corresponding third signal based on the received coherent signal;
and the processing device is used for obtaining the related information of the detection target based on the third signal.
8. A coherent signal receiving method, comprising:
receiving a plurality of coherent signals and generating a corresponding plurality of first signals having a polarity based on the received coherent signals;
and performing depolarization processing on the corresponding first signal or the superposed signal of the plurality of first signals according to a preset rule to obtain a second signal.
9. The method of claim 8, wherein the preset rules comprise:
performing even power processing on the first signal or a superposed signal of a plurality of first signals to obtain a second signal; or
And obtaining the second signal by taking an absolute value of a superposed signal of the first signal or the plurality of first signals.
10. The method according to claim 8 or 9, characterized in that the method further comprises:
and outputting a third signal after superposing the input signals including at least part of the second signal.
11. The method of claim 8, further comprising:
and judging the polarity of each first signal based on a preset function and preset parameters to obtain a judgment result, wherein the judgment result is used for indicating the division of a plurality of related array units and/or whether to execute the depolarization processing.
12. The method of claim 11, wherein the determining result is used for indicating whether each signal processing unit executes the depolarization processing, and comprises:
and when the polarity of the first signal is not the preset polarity, performing the depolarization processing according to a preset rule, otherwise, not performing the depolarization processing.
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