CN115508803B - Beam sharpening processing method and system based on DSP digital signal processing board - Google Patents
Beam sharpening processing method and system based on DSP digital signal processing board Download PDFInfo
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- CN115508803B CN115508803B CN202211469969.4A CN202211469969A CN115508803B CN 115508803 B CN115508803 B CN 115508803B CN 202211469969 A CN202211469969 A CN 202211469969A CN 115508803 B CN115508803 B CN 115508803B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
Abstract
The invention relates to the field of signal processing, in particular to a beam sharpening processing method and a beam sharpening processing system based on a DSP (digital signal processing) board. The method comprises the steps of obtaining echo amplitude signals, wherein the echo amplitude signals present edge peaks at two side lines; extracting first input voltage data corresponding to the edge peak and second input voltage data of a middle line of the echo amplitude signal according to the extraction frequency by using the first beam width; performing weighted difference operation on the first input voltage data and the second input voltage data to realize that the first beam width is converted into a second beam width, wherein the first beam width is greater than the second beam width; and adjusting the extraction frequency according to the relation between the signal peak value corresponding to the first result and the echo amplitude signal. The beam sharpening process is completed by extracting two signals and performing superposition operation on one signal, so that the calculated amount in the beam sharpening process is greatly reduced, the data processing amount before image imaging is greatly reduced, and the image processing speed is improved.
Description
Technical Field
The invention relates to the field of image processing, in particular to a beam sharpening processing method and a beam sharpening processing system based on a DSP (digital signal processing) board.
Background
Generally, the main indicators for measuring the radar image effect are distance resolution and azimuth resolution. For azimuth resolution, it is mainly determined by the azimuth beamwidth, which generally depends on the horizontal width of the antenna front.
In practical application, when a radar imaging effect is improved, a conventional means for improving azimuth resolution is to sharpen a beam, and a general processing idea starts with signal processing to realize sharpening of beam width and further realize azimuth super-resolution. It is based on the fact that: the radar in the azimuth direction echo is the result of convolution of the antenna directional diagram horizontal plane information and the target azimuth information, and the range direction echo is the result of convolution of the antenna directional diagram vertical plane information and the target distance information, so that the convolution inversion can be realized by obtaining the inverse system of the system by utilizing the deconvolution method to reconstruct the accurate position of the target theoretically. Deconvolution is common, and there are generalized inverse filtering algorithms in the time domain and windowed wiener filtering algorithms in the frequency domain.
Because the calculation related to time domain frequency domain transformation, deconvolution operation and the like needs stronger hardware support, the method has no realizable condition for low-cost radars such as shipborne navigation radars and the like. Therefore, in the prior art, beam sharpening needs a large amount of operation and has high requirements on hardware, so that the improvement of radar imaging quality has limitations.
Disclosure of Invention
Therefore, the invention provides a beam sharpening processing method based on a DSP digital signal processing board, which can solve the limitation problem caused by sharpening by carrying out a large amount of operation in the prior art.
In order to achieve the above object, an aspect of the present invention provides a beam sharpening method based on a DSP digital signal processing board, including:
acquiring an echo amplitude signal, wherein the echo amplitude signal presents edge peaks at two side lines;
extracting first input voltage data corresponding to the edge peak and second input voltage data of a middle line of the echo amplitude signal according to the extraction frequency by using the first beam width;
performing weighted difference operation on the first input voltage data and the second input voltage data to obtain a first operation result, so as to convert a first beam width into a second beam width, wherein the first beam width is greater than the second beam width;
adjusting the extraction frequency through a set adjustment coefficient according to whether the phase information of the signal peak value corresponding to the first operation result and the phase information of the first peak value in the echo amplitude signal have an inclusion relationship or not so as to correct the first operation result and obtain a target operation result;
presetting a judgment threshold, and comparing the target operation result with the judgment threshold;
if the target operation result is larger than the judgment threshold, performing logarithmic calculation on voltage data corresponding to the target operation result, performing data reduction, and storing line data subjected to data reduction in a first cache region;
and judging whether the width of the line data in the first cache region reaches a preset threshold, and if the width of the line data is greater than the preset threshold, performing delay operation on the line data to form a radar image.
Further, adjusting the extraction frequency according to the relationship between the signal peak value corresponding to the first operation result and the echo amplitude signal includes:
acquiring a first peak value of an echo amplitude signal and a signal peak value corresponding to a first operation result, and if the signal peak value corresponding to the first operation result does not comprise the first peak value, improving the extraction frequency according to the phase information phi 1 where the first peak value is located and the relationship between the phase information phi 2 where the signal peak value is located in a waveform signal corresponding to the first operation result and a preset phase standard range phi 10-phi 20;
if the signal peak value corresponding to the first operation result includes the first peak value, the extraction frequency does not need to be adjusted.
Further, a phase standard range phi 10-phi 20, a first adjusting coefficient k1, a second adjusting coefficient k2 and a third adjusting coefficient k3 are preset, wherein phi 10 represents a phase minimum value, and phi 20 represents a phase maximum value;
when the extraction frequency is improved, comparing phase information phi 1 where the first peak value is located with phase information phi 2 where the signal peak value is located in the waveform signal corresponding to the first operation result;
and selecting an adjusting coefficient according to the relation between the comparison result and the phase standard range to adjust the extraction frequency.
Further, if | φ 1- φ 2| < φ 10, selecting a first adjustment coefficient k1 to adjust the extraction frequency;
if phi 20 is more than or equal to | phi 1-phi 2| is more than or equal to phi 10, selecting a second adjustment coefficient k2 to adjust the extraction frequency;
and if the | phi 1-phi 2| is larger than phi 20, selecting a third adjustment coefficient k3 to adjust the extraction frequency.
Further, recording a first time length T1 for converting the first beam width into a second beam width and a second time length T2 for carrying out data recovery;
acquiring an image quality parameter Q of the radar imaging, and presetting imaging standard quality Q0;
if the image quality parameter Q is not less than the imaging standard quality Q0, the radar imaging quality is in accordance with the requirement;
if the image quality parameter Q is smaller than Q0, the radar imaging quality is unqualified, and after the radar imaging quality is determined to be unqualified, the first time length T1 and the second time length T2 are prolonged in the next imaging period.
Further, when the first time length T1 and the second time length T2 in the next imaging period are extended;
if Q0-Q is less than or equal to 0.2 XQ 0, the first time length T1 is prolonged;
if 0.8 XQ 0 is not less than Q0-Q >0.2 XQ 0, the second time length T2 is prolonged;
if Q0 is not less than Q0-Q >0.8 XQ 0, the first time length T1 and the second time length T2 are simultaneously extended.
Further, when the first time length is prolonged, the actual amplitude of the prolonging is determined according to the extracted data volume D;
presetting a standard data quantity D0 and a standard data quantity difference value delta D0;
if the extracted data volume | D-D0| is more than or equal to Δ D0, adopting a first correction index alpha 1 to prolong the first time length;
if the extracted data amount | D-D0| < Δ D0, the first time duration is extended by using a second correction index α 2, where the first correction index α 1> the second correction index α 2.
Further, when the second time span is prolonged, the actual amplitude of the prolonging is determined according to the historical data reduction efficiency;
a standard reduction efficiency P0 is preset, and if the historical data reduction efficiency is smaller than the standard reduction efficiency P0, a first compensation coefficient beta 1 is adopted to prolong the second time length;
and if the historical data reduction efficiency is greater than the standard reduction efficiency P0, extending the second time length by adopting a second compensation coefficient beta 2.
Further, the first time length T1 and the second time length T2 are simultaneously extended;
if the first time length T1 is the first correction index alpha 1, selecting a second compensation coefficient beta 2 for the second time length;
if the first time length T1 is the second correction index alpha 2, selecting a first compensation coefficient beta 1 for the second time length;
setting a weight coefficient according to the proportion of the first time length to the second time length in the sharpening process, and respectively adjusting a first compensation coefficient and a second compensation coefficient by using the weight coefficient;
the weight coefficient corresponding to the first time length is set as a first weight coefficient, and the weight coefficient corresponding to the second time length is set as a second weight coefficient;
the first weight coefficient is T1/(T1 + T2); the second weight coefficient is T2/(T1 + T2).
In another aspect, the present invention further provides a beam sharpening processing system based on a DSP digital signal processing board, which applies the beam sharpening processing method based on a DSP digital signal processing board as described above, and the system includes:
the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring an echo amplitude signal which presents edge peaks at two side lines;
the extraction module is used for extracting first input voltage data corresponding to the edge peak and second input voltage data of a middle line of the echo amplitude signal according to the extraction frequency by using the first beam width;
the conversion module is used for performing weighted difference operation on the first input voltage data and the second input voltage data to obtain a first operation result, so that the first beam width is converted into a second beam width, the conversion time is set to be a first time length T1, and the first beam width is larger than the second beam width;
the adjusting module is used for adjusting the extraction frequency through a set adjusting coefficient according to whether the phase information of the signal peak value corresponding to the first operation result and the phase information of the first peak value in the echo amplitude signal have an inclusion relationship or not so as to correct the first operation result and obtain a target operation result;
the comparison module is internally provided with a judgment threshold in advance and compares the target operation result with the judgment threshold;
the restoring module is used for carrying out logarithmic calculation on the voltage data corresponding to the target operation result if the target operation result is greater than the judgment threshold, carrying out data restoration, setting the time for carrying out the data restoration as a second time length T2, and storing the line data subjected to the data restoration in a first cache region;
and the judging module is used for judging whether the width of the line data in the first cache region reaches a preset threshold, and if the width of the line data is greater than the preset threshold, performing time delay operation on the line data to form a radar image.
Compared with the prior art, the method has the advantages that the conversion from the wide beam to the narrow beam is realized by extracting the edge peak signal from the acquired echo amplitude signal, extracting the first input voltage of the echo amplitude signal and the second voltage signal of the middle line and performing the weighted difference operation on the first input voltage data and the second input voltage data, and further the beam sharpening process is completed.
Particularly, the adjustment of the extraction frequency is determined by setting the relationship between the phase standard range phi 10-phi 20 and the phase information phi 1 where the first peak value is located and the phase information phi 2 where the signal peak value is located in the waveform signal corresponding to the first operation result, so that the extraction quantity of the first input voltage data and the second output voltage data is more accurate, the first peak value is made to be in line with the signal peak value in the waveform signal corresponding to the first operation result, the reduction of the signal extraction accuracy caused by inaccuracy of the extraction frequency is avoided, the extraction frequency is greatly improved, the extraction accuracy of the signal is higher, and the image quality after image conversion is performed based on the extraction signal is further improved.
Particularly, the adjustment coefficient is determined according to the relation between phi 1 and phi 2, the extraction frequency is adjusted according to the adjustment coefficient, so that the extracted signals are more accurate, the imaging quality of the signals is greatly improved, the number and the accuracy of the signals are improved through the adjustment of the extraction frequency, and the imaging quality is further improved.
In particular, different adjustment coefficients are selected according to the relationship between the difference value of the two phases and the standard difference value, so that the determination of the extraction frequency is more accurate and efficient, in practical application, for | phi 1-phi 2| < phi 10, the first adjustment coefficient is selected to adjust the extraction frequency, the coefficient for adjustment does not need to be too large because the error is not large, and the third adjustment coefficient k3 which is relatively large is selected to adjust the extraction frequency when | phi 1-phi 2| > phi 20 is large because the error is large, so that the extraction frequency of the signal is more accurate, and the imaging quality of the image is effectively improved.
Particularly, effective suppression of noise in a radar picture is achieved by setting a decision threshold, the imaging quality of a similar large picture is greatly improved, sharpened voltage data need to be subjected to data reduction through logarithmic operation and are stored in a 1.5-degree wave beam width output buffer area, and zero clearing suppression is performed when the line data width after wave beam sharpening does not reach the threshold of 1.5 degrees. And directly outputting data for the data passing through the 1.5-degree threshold line. And for the state that the accumulated number of lines exceeds the threshold of 1.5 degrees and the current line does not meet the threshold, performing output buffer emptying output processing.
In particular, by evaluating the image quality and evaluating the radar imaging quality in the current period, the operation of the signals is determined to be performed twice before the image imaging conversion is performed in the next period, and the time with the proper length is allocated for signal processing, so that the effective processing of the signals in the processing time length is facilitated, the processing efficiency and the accuracy of the imaging signals are greatly improved, and the image quality is effectively improved in the next imaging period.
Particularly, the adjustment amplitude of the first time length and the second time length is determined according to the relation between the actual imaging quality and the standard imaging quality, so that the imaging quality is more accurately controlled in practical application, more fine adjustment and control on the imaging quality are realized, the image quality meeting the actual requirement is output, and the balance between the image quality and the signal processing time is realized.
Particularly, the data volume of the extracted signal after the extraction frequency is adjusted is evaluated, the relationship between the absolute value of the difference value of the data volume and the standard data volume D0 and the standard data volume difference value delta D0 is determined, and the amplitude of the adjustment of the first time length is determined according to the corresponding relationship, so that the image signal processing quantity in the embodiment of the invention meets the actual requirement, the excessive reduction of the processing efficiency of the processed signal is avoided, the effective time of signal processing is ensured through the adjustment of the time length in the embodiment of the invention, the processing and the filtering of the signal are conveniently completed within the processing time length, and the efficiency of data processing and the improvement of the imaging quality are improved.
Particularly, the signal reduction efficiency in the current signal processing process is predicted by determining the historical signal reduction efficiency, the extension amplitude of the second time length is determined according to the signal reduction efficiency and the signal data amount, if the signal reduction efficiency is high, the processing efficiency is high, a smaller compensation coefficient is selected to extend the second time length, and if the historical data reduction efficiency is low, more time is needed in the signal processing process, so that the second time length is extended by a larger compensation coefficient, the time length in the data reduction process is consistent, the signal data can be reduced in a proper time length range, the signal quality after the signal reduction is greatly improved, and the imaging quality is improved.
Through the increase of the weight coefficient of setting up first compensation coefficient and second compensation coefficient for to the definite more accurate of first time length and second time length, more can embody the requirement in the treatment effeciency of the signal of signal processing in-process, make first time length and the second time length of revising through the weight coefficient more accurate, guarantee when guaranteeing to carry out signal processing, improve data processing efficiency and signal precision, make image imaging quality promote greatly.
Drawings
Fig. 1 is a schematic flowchart of a beam sharpening processing method based on a DSP digital signal processing board according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating an implementation of a beam sharpening processing method based on a DSP digital signal processing board according to an embodiment of the present invention;
FIG. 3 is a system diagram of a beam sharpening process in an embodiment of the invention;
fig. 4 is a schematic diagram of signal processing based on the DSP board according to the embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in conjunction with the following examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a beam sharpening processing method based on a DSP digital signal processing board according to an embodiment of the present invention includes:
step S100: acquiring an echo amplitude signal, wherein the echo amplitude signal presents edge peaks at two side lines;
step S200: extracting first input voltage data corresponding to the edge peak and second input voltage data of a middle line of the echo amplitude signal according to the extraction frequency by using the first beam width;
step S300: performing weighted difference operation on the first input voltage data and the second input voltage data to obtain a first operation result, so as to convert a first beam width into a second beam width, wherein the first beam width is greater than the second beam width;
step S400: adjusting the extraction frequency through a set adjustment coefficient according to whether the phase information of the signal peak value corresponding to the first operation result and the phase information of the first peak value in the echo amplitude signal have an inclusion relationship, so as to correct the first operation result and obtain a target operation result;
step S500: presetting a judgment threshold in advance, and comparing the target operation result with the judgment threshold;
step S600: if the target operation result is larger than the judgment threshold, performing logarithmic calculation on voltage data corresponding to the target operation result, performing data reduction, setting the time length for performing data reduction as a second time length, and storing line data subjected to data reduction in a first cache region;
step S700: and judging whether the width of the line data in the first cache region reaches a preset threshold, and if the width of the line data is greater than the preset threshold, performing delay operation on the line data to form a radar image.
Specifically, in the embodiment of the invention, the acquired echo amplitude signal is subjected to edge spike signal extraction, the first input voltage of the echo amplitude signal and the second voltage signal of a middle line are extracted, and the first input voltage data and the second input voltage data are subjected to weighted difference operation, so that the conversion from a wide beam to a narrow beam is realized, and the beam sharpening process is further completed.
Specifically, the embodiment of the invention realizes effective suppression of noise in radar pictures by setting the decision threshold, greatly improves the imaging quality of similar large pictures, ensures that sharpened voltage data needs to complete logarithmic operation for data recovery, stores the data in a 1.5-degree beam width output buffer area, and performs zero clearing suppression when the width of the sharpened line data does not reach 1.5 degrees of the threshold. And directly outputting data for the data passing through the 1.5-degree threshold line. And for the state that the accumulated number of lines which pass the threshold of 1.5 degrees and the current line does not meet the threshold, performing output buffer emptying output processing.
Specifically, as shown in fig. 2, step S400 includes:
step S401: acquiring a first peak value of an echo amplitude signal and a signal peak value corresponding to a first operation result, and if the signal peak value corresponding to the first operation result does not comprise the first peak value, improving the extraction frequency according to the phase information phi 1 where the first peak value is located and the relationship between the phase information phi 2 where the signal peak value is located in a waveform signal corresponding to the first operation result and a preset phase standard range phi 10-phi 20;
step S402: if the signal peak value corresponding to the first operation result includes the first peak value, the extraction frequency does not need to be adjusted.
Specifically, the embodiment of the invention determines the adjustment of the extraction frequency by setting the relationship between the phase standard range phi 10-phi 20 and the phase information phi 1 where the first peak is located and the phase information phi 2 where the signal peak is located in the waveform signal corresponding to the first operation result, so that the extraction quantity of the first input voltage data and the second output voltage data is more accurate, the first peak is made to be in line with the signal peak in the waveform signal corresponding to the first operation result, the reduction of the signal extraction accuracy caused by the inaccuracy of the extraction frequency is avoided, the extraction frequency is greatly improved, the extraction accuracy of the signal is higher, and the image quality after image conversion based on the extraction signal is further improved.
Specifically, a phase standard range phi 10-phi 20, a first adjusting coefficient k1, a second adjusting coefficient k2 and a third adjusting coefficient k3 are preset, wherein phi 10 represents a phase minimum value, and phi 20 represents a phase maximum value;
when the extraction frequency is improved, comparing phase information phi 1 where the first peak value is located with phase information phi 2 where the signal peak value is located in the waveform signal corresponding to the first operation result;
and selecting an adjusting coefficient according to the relation between the comparison result and the phase standard range to adjust the extraction frequency.
Specifically, the embodiment of the invention determines the adjustment coefficient according to the relation between phi 1 and phi 2, adjusts the extraction frequency according to the adjustment coefficient, so that the extracted signals are more accurate, the imaging quality of the signals is greatly improved, and the quantity and the accuracy of the signals are improved by adjusting the extraction frequency, so that the imaging quality is further improved.
Specifically, if | φ 1- φ 2| < φ 10, a first adjustment coefficient k1 is selected to adjust the extraction frequency;
if phi 20 is more than or equal to | phi 1-phi 2| is more than or equal to phi 10, selecting a second adjustment coefficient k2 to adjust the extraction frequency;
and if the | phi 1-phi 2| is larger than phi 20, selecting a third adjusting coefficient k3 to adjust the extraction frequency.
Specifically, in the embodiment of the present invention, different adjustment coefficients are selected according to a relationship between a difference value of two phases and a standard difference value, so that determination of an extraction frequency is more accurate and efficient, in practical applications, for | Φ 1- Φ 2| < Φ 10, a first adjustment coefficient is selected to adjust the extraction frequency, since an error is not large, the coefficient to be adjusted does not need to be too large, and when | Φ 1- Φ 2| > Φ 20, since an error is large, a relatively large third adjustment coefficient k3 is selected to adjust the extraction frequency, so that the extraction frequency of a signal is more accurate, and further, imaging quality of an image is effectively improved.
Specifically, a first time length T1 for converting a first beam width into a second beam width and a second time length T2 for performing data recovery are recorded;
acquiring an image quality parameter Q of the radar imaging, and presetting imaging standard quality Q0;
if the image quality parameter Q is not less than the imaging standard quality Q0, the radar imaging quality is in accordance with the requirement;
if the image quality parameter Q is less than Q0, the radar imaging quality is unqualified, and after the radar imaging is determined to be unqualified, the first time length T1 and the second time length T2 are prolonged in the next imaging period.
Specifically, the embodiment of the invention determines that the operation of the signals is performed twice before the image imaging conversion is performed in the next period to perform the time adjustment by evaluating the image quality and evaluating the radar imaging quality in the current period, and allocates the time with the proper length for the signal processing, so that the effective processing of the signals in the processing time length is facilitated, the processing efficiency and the accuracy of the imaging signals are greatly improved, and the image quality is effectively improved in the next imaging period.
Specifically, when the first time length T1 and the second time length T2 in the next imaging period are extended;
if Q0-Q is less than or equal to 0.2 XQ 0, prolonging the first time length T1;
if 0.8 XQ 0 is not less than Q0-Q >0.2 XQ 0, the second time length T2 is prolonged;
if Q0 is not less than Q0-Q >0.8 XQ 0, the first time length T1 and the second time length T2 are simultaneously extended.
Specifically, in the embodiment of the present invention, the adjustment ranges for the first time length and the second time length are determined according to the relationship between the actual imaging quality and the standard imaging quality, so that in practical application, the control on the imaging quality is more accurate, the imaging quality is more finely adjusted and controlled, the image quality meeting the actual requirement is output, and the balance between the image quality and the signal processing time is realized.
Specifically, when the first time length is extended, the actual extension amplitude is determined according to the extracted data volume D;
presetting a standard data quantity D0 and a standard data quantity difference value delta D0;
if the extracted data volume | D-D0| is more than or equal to Δ D0, extending the first time length by adopting a first correction index α 1;
if the extracted data amount | D-D0| < Δ D0, the first time duration is extended by a second correction index α 2, wherein the first correction index α 1> the second correction index α 2.
Specifically, in the embodiment of the present invention, the data volume of the extracted signal after the extraction frequency is adjusted is evaluated, the relationship between the absolute value of the difference between the data volume and the standard data volume D0 and the standard data volume difference Δ D0 is determined, and the amplitude of the adjustment of the first time length is determined according to the corresponding relationship, so that the image signal processing amount in the embodiment of the present invention meets the actual requirement, and the reduction of the processing efficiency due to excessive signal processing is avoided.
Specifically, when the second time length is prolonged, the actual amplitude of the prolonging is determined according to the historical data reduction efficiency;
presetting standard reduction efficiency P0, and if the historical data reduction efficiency is lower than the standard reduction efficiency P0, adopting a first compensation coefficient beta 1 to prolong the second time span;
and if the historical data reduction efficiency is greater than the standard reduction efficiency P0, extending the second time length by adopting a second compensation coefficient beta 2.
Specifically, in the embodiment of the present invention, the signal reduction efficiency in the current signal processing process is predicted by determining the historical signal reduction efficiency, the extension amplitude for the second time length is determined according to the signal reduction efficiency and the signal data amount, if the signal reduction efficiency is high, the processing efficiency is high, a smaller compensation coefficient is selected to extend the second time length, and if the historical data reduction efficiency is low, more time is required in the signal processing process, so that a larger compensation coefficient is used to extend the second time length, so that the time lengths in the data reduction process are consistent, the signal data reduction is completed in a suitable time length range, the signal quality after the signal reduction is greatly improved, and the imaging quality is improved.
Specifically, the first time length T1 and the second time length T2 are simultaneously extended;
if the first time length T1 is the first correction index alpha 1, selecting a second compensation coefficient beta 2 for the second time length;
if the first time length T1 is the second correction index alpha 2, the second time length is the first compensation coefficient beta 1;
setting a weight coefficient according to the proportion of the first time length to the second time length in the sharpening process, and respectively adjusting a first compensation coefficient and a second compensation coefficient by using the weight coefficient;
specifically, the weight coefficient corresponding to the first time length is set as a first weight coefficient, and the weight coefficient corresponding to the second time length is set as a second weight coefficient;
the first weight coefficient is T1/(T1 + T2); the second weight coefficient is T2/(T1 + T2).
Specifically, by setting the weight coefficients of the first compensation coefficient and the second compensation coefficient to be increased, the embodiments of the present invention make the determination of the first time length and the second time length more accurate, and can better reflect the requirement on the processing efficiency of the signal in the signal processing process, so that the first time length and the second time length corrected by the weight coefficients are more accurate, thereby ensuring that the signal processing is performed, improving the data processing efficiency and the signal accuracy, and greatly improving the image imaging quality.
The embodiment of the invention also provides a beam sharpening processing system based on the DSP digital signal processing board, which comprises: the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring an echo amplitude signal which presents edge peaks at two side lines;
the extraction module is used for extracting first input voltage data corresponding to the edge peak and second input voltage data of a middle line of the echo amplitude signal according to the extraction frequency by using the first beam width;
the conversion module is used for performing weighted difference operation on the first input voltage data and the second input voltage data to obtain a first operation result, so that the first beam width is converted into a second beam width, the conversion time is set to be a first time length T1, and the first beam width is larger than the second beam width;
the adjusting module is used for adjusting the extraction frequency through a set adjusting coefficient according to whether the phase information of the signal peak value corresponding to the first operation result and the phase information of the first peak value in the echo amplitude signal have an inclusion relationship;
the comparison module is internally provided with a judgment threshold in advance and compares the first operation result with the judgment threshold;
the restoring module is used for carrying out logarithmic calculation on the voltage data corresponding to the first operation result if the first operation result is greater than the judgment threshold, carrying out data restoration, setting the time for carrying out the data restoration as a second time length T2, and storing the line data subjected to the data restoration in a first cache region;
and the judging module is used for judging whether the width of the line data in the first cache region reaches a preset threshold or not, and if the width of the line data is greater than the preset threshold, performing delay operation on the line data to form a radar image.
The beam sharpening processing system based on the DSP digital signal processing board provided by the embodiment of the present invention can achieve the same technical effect by applying the technical scheme of the sharpening processing method, and is not described herein again.
Specifically, if the first operation result is less than or equal to the decision threshold, the first cache is emptied.
Specifically, before the echo amplitude signal is acquired, the method further includes: receiving an echo signal, and compressing the dynamic range of the echo signal by using an intermediate frequency amplifier;
the echo signals are anti-log processed.
Specifically, when the dynamic range of the echo signal is compressed by the intermediate frequency amplifier, the input and output of the echo signal satisfy the following relationship:
po =0.033254 × lg (Pi) +0.37838; po, pi units: w;
vo = ((0.033254 × lg (Vi ^ 2/50) + 0.37838) × 50) ^0.5; logarithmic Vo, vi units: v;
vi = (10 ^ ((Vo ^ 2/50-0.37838)/0.033254) x 50) ^0.5, antilog Vo, vi unit: and V.
Specifically, the first antenna horizontal beam width is 4 ° beam width, and the second beam width is 1.5 ° beam width.
Specifically, as shown in fig. 3 and 4, the beam sharpening in the embodiment of the present invention is performed in the digital board DSP, and the processed signal is amplitude data (azimuth sampling interval is 0.25 degrees) output by the intermediate frequency board and then accumulated by the digital board FPGA. To compress the dynamic range of the echo signal, if amplifiers typically use logarithmic amplification, which destroys the linear nature of the receiver. In the beam sharpening process, the system needs to meet the linear requirement, and the amplitude data needs to be subjected to inverse logarithmic processing. As shown in fig. 4, in the sharpening process, in the embodiment of the present invention, the radar antenna real horizontal beam is 4 °, the azimuth sampling interval is 0.25 °, and 17 line input buffers are reserved for the algorithm. The decision threshold AzS _ diff _ temp =5.0e-5 for the weighted difference of the input signals is then drawn up in connection with the actual echo diagram effect.
And the sharpened voltage data needs to be subjected to data reduction by logarithm operation and stored in a 1.5-degree beam width output buffer area, and zero clearing inhibition is carried out when the data width of the sharpened line of the beam does not reach 1.5 degrees of a threshold. And directly outputting data for the data passing through the 1.5-degree threshold line. And for the state that the accumulated number of lines exceeds the threshold of 1.5 degrees and the current line does not meet the threshold, performing output buffer emptying output processing.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A beam sharpening processing method based on a DSP digital signal processing board is characterized by comprising the following steps:
acquiring an echo amplitude signal, wherein the echo amplitude signal presents edge peaks at two side lines;
extracting first input voltage data corresponding to the edge peak and second input voltage data of a middle line of the echo amplitude signal according to the extraction frequency by using the first beam width;
performing weighted difference operation on the first input voltage data and the second input voltage data to obtain a first operation result, so as to convert a first beam width into a second beam width, wherein the first beam width is greater than the second beam width;
adjusting the extraction frequency through a set adjustment coefficient according to whether the phase information of the signal peak value corresponding to the first operation result and the phase information of the first peak value in the echo amplitude signal have an inclusion relationship, so as to correct the first operation result and obtain a target operation result;
presetting a judgment threshold, and comparing the target operation result with the judgment threshold;
if the target operation result is larger than the judgment threshold, performing logarithmic calculation on voltage data corresponding to the target operation result, performing data reduction, and storing line data subjected to data reduction in a first cache region;
and judging whether the width of the line data in the first cache region reaches a preset threshold, and if the width of the line data is greater than the preset threshold, performing delay operation on the line data to form a radar image.
2. The beam sharpening processing method based on the DSP digital signal processing board of claim 1, wherein adjusting the extraction frequency according to a relationship between a signal peak value corresponding to the first operation result and the echo amplitude signal comprises:
acquiring a first peak value of an echo amplitude signal and a signal peak value corresponding to a first operation result, and if the signal peak value corresponding to the first operation result does not comprise the first peak value, improving the extraction frequency according to the phase information phi 1 where the first peak value is located and the relationship between the phase information phi 2 where the signal peak value is located in a waveform signal corresponding to the first operation result and a preset phase standard range phi 10-phi 20;
if the signal peak value corresponding to the first operation result includes the first peak value, the extraction frequency does not need to be adjusted.
3. The beam sharpening processing method based on the DSP digital signal processing board according to claim 2,
presetting a phase standard range phi 10-phi 20, a first adjusting coefficient k1, a second adjusting coefficient k2 and a third adjusting coefficient k3, wherein phi 10 represents a phase minimum value, and phi 20 represents a phase maximum value;
when the extraction frequency is improved, comparing phase information phi 1 where the first peak value is located with phase information phi 2 where the signal peak value is located in the waveform signal corresponding to the first operation result;
and selecting an adjusting coefficient according to the relation between the comparison result and the phase standard range to adjust the extraction frequency.
4. The beam sharpening processing method based on the DSP digital signal processing board according to claim 3,
if the | phi 1-phi 2| is less than phi 10, selecting a first adjustment coefficient k1 to adjust the extraction frequency;
if phi 20 is more than or equal to | phi 1-phi 2| is more than or equal to phi 10, selecting a second adjustment coefficient k2 to adjust the extraction frequency;
and if the | phi 1-phi 2| is larger than phi 20, selecting a third adjusting coefficient k3 to adjust the extraction frequency.
5. The beam sharpening processing method based on the DSP digital signal processing board of claim 4, wherein the conversion time is set to a first time length T1, and the time for performing the data reduction is set to a second time length T2;
recording a first time length T1 for converting the first beam width into a second beam width and a second time length T2 for carrying out data restoration;
acquiring an image quality parameter Q of the radar imaging, and presetting imaging standard quality Q0;
if the image quality parameter Q is not less than the imaging standard quality Q0, the radar imaging quality is in accordance with the requirement;
if the image quality parameter Q is less than Q0, the radar imaging quality is unqualified, and after the radar imaging is determined to be unqualified, the first time length T1 and the second time length T2 are prolonged in the next imaging period.
6. The beam sharpening processing method based on the DSP digital signal processing board according to claim 5,
when the first time length T1 and the second time length T2 in the next imaging period are extended;
if Q0-Q is less than or equal to 0.2 XQ 0, the first time length T1 is prolonged;
if 0.8 XQ 0 is not less than Q0-Q >0.2 XQ 0, the second time length T2 is prolonged;
if Q0 is not less than Q0-Q >0.8 XQ 0, the first time length T1 and the second time length T2 are simultaneously prolonged.
7. The beam sharpening processing method based on the DSP digital signal processing board according to claim 6,
when the first time length is prolonged, determining the actual amplitude of the prolonging according to the extracted data volume D;
presetting a standard data quantity D0 and a standard data quantity difference value delta D0;
if the extracted data volume | D-D0| is more than or equal to Δ D0, extending the first time length by adopting a first correction index α 1;
if the extracted data amount | D-D0| < Δ D0, the first time duration is extended by using a second correction index α 2, where the first correction index α 1> the second correction index α 2.
8. The beam sharpening processing method based on the DSP digital signal processing board according to claim 7,
when the second time length is prolonged, the actual amplitude of the prolonging is determined according to the historical data reduction efficiency;
presetting standard reduction efficiency P0, and if the historical data reduction efficiency is lower than the standard reduction efficiency P0, adopting a first compensation coefficient beta 1 to prolong the second time span;
and if the historical data reduction efficiency is greater than the standard reduction efficiency P0, extending the second time length by adopting a second compensation coefficient beta 2.
9. The beam sharpening processing method based on the DSP digital signal processing board according to claim 8,
simultaneously extending the first time length T1 and the second time length T2;
if the first time length T1 is the first correction index alpha 1, selecting a second compensation coefficient beta 2 for the second time length;
if the first time length T1 is the second correction index alpha 2, the second time length is the first compensation coefficient beta 1;
setting a weight coefficient according to the proportion of the first time length to the second time length in the sharpening process, and respectively adjusting a first compensation coefficient and a second compensation coefficient by using the weight coefficient;
the weight coefficient corresponding to the first time length is set as a first weight coefficient, and the weight coefficient corresponding to the second time length is set as a second weight coefficient;
the first weight coefficient is T1/(T1 + T2); the second weight coefficient is T2/(T1 + T2).
10. A DSP-based beam sharpening processing system to which the DSP-based beam sharpening processing method of any one of claims 1 to 9 is applied, comprising:
the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring an echo amplitude signal which presents edge peaks at two side lines;
the extraction module is used for extracting first input voltage data corresponding to the edge peak and second input voltage data of a middle line of the echo amplitude signal according to the extraction frequency by using the first beam width;
the conversion module is used for performing weighted difference operation on the first input voltage data and the second input voltage data to obtain a first operation result, so that the first beam width is converted into a second beam width, the conversion time is set to be a first time length T1, and the first beam width is larger than the second beam width;
the adjusting module is used for adjusting the extraction frequency through a set adjusting coefficient according to whether the phase information of the signal peak value corresponding to the first operation result and the phase information of the first peak value in the echo amplitude signal have an inclusion relationship or not so as to correct the first operation result and obtain a target operation result;
the comparison module is internally provided with a judgment threshold in advance and compares the target operation result with the judgment threshold;
the restoring module is used for carrying out logarithmic calculation on the voltage data corresponding to the target operation result if the target operation result is greater than the judgment threshold, carrying out data restoration, setting the time for carrying out the data restoration as a second time length T2, and storing the line data subjected to the data restoration in a first cache region;
and the judging module is used for judging whether the width of the line data in the first cache region reaches a preset threshold or not, and if the width of the line data is greater than the preset threshold, performing delay operation on the line data to form a radar image.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4387373A (en) * | 1977-04-21 | 1983-06-07 | Westinghouse Electric Corp. | Synthetic monopulse radar |
| US6563451B1 (en) * | 2002-01-16 | 2003-05-13 | Raytheon Company | Radar imaging system and method |
| CN102176018A (en) * | 2011-03-15 | 2011-09-07 | 西安电子科技大学 | Doppler wave beam sharpening rapid imaging method of mechanical scanning radar |
| CN103323854A (en) * | 2012-03-22 | 2013-09-25 | 中国科学院电子学研究所 | Doppler beam sharpening imaging method and device |
| CN105182332A (en) * | 2015-09-15 | 2015-12-23 | 上海无线电设备研究所 | Two-dimensional wave beam sharpening method |
| CN106970386A (en) * | 2017-03-31 | 2017-07-21 | 西安电子科技大学 | A kind of optimization method of RADOP beam sharpening |
| CN109613532A (en) * | 2019-01-02 | 2019-04-12 | 电子科技大学 | A kind of airborne radar Real Time Doppler beam sharpening super-resolution imaging method |
| CN112034459A (en) * | 2020-08-14 | 2020-12-04 | 宋千 | Linear synthetic aperture radar imaging method and system based on antenna directional diagram compensation |
-
2022
- 2022-11-23 CN CN202211469969.4A patent/CN115508803B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4387373A (en) * | 1977-04-21 | 1983-06-07 | Westinghouse Electric Corp. | Synthetic monopulse radar |
| US6563451B1 (en) * | 2002-01-16 | 2003-05-13 | Raytheon Company | Radar imaging system and method |
| CN102176018A (en) * | 2011-03-15 | 2011-09-07 | 西安电子科技大学 | Doppler wave beam sharpening rapid imaging method of mechanical scanning radar |
| CN103323854A (en) * | 2012-03-22 | 2013-09-25 | 中国科学院电子学研究所 | Doppler beam sharpening imaging method and device |
| CN105182332A (en) * | 2015-09-15 | 2015-12-23 | 上海无线电设备研究所 | Two-dimensional wave beam sharpening method |
| CN106970386A (en) * | 2017-03-31 | 2017-07-21 | 西安电子科技大学 | A kind of optimization method of RADOP beam sharpening |
| CN109613532A (en) * | 2019-01-02 | 2019-04-12 | 电子科技大学 | A kind of airborne radar Real Time Doppler beam sharpening super-resolution imaging method |
| CN112034459A (en) * | 2020-08-14 | 2020-12-04 | 宋千 | Linear synthetic aperture radar imaging method and system based on antenna directional diagram compensation |
Non-Patent Citations (3)
| Title |
|---|
| RADAR BEAM SHARPENING USING AN OPTIMUM FIR FILTER;Firooz Sadjadi;《Circuts Systems Signal Process》;20000228;第19卷(第2期);第121-129页 * |
| 基于单脉冲技术的雷达前视成像算法研究及硬件实现;吴飞;《中国优秀硕士学位论文全文数据库信息科技辑(月刊)》;20120815(第8期);第I136-764页 * |
| 高帧率雷达成像系统设计与算法研究;徐众;《中国博士学位论文全文数据库信息科技辑(月刊)》;20220415(第4期);第I136-86页 * |
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