CN116068484A - Direction finding method for realizing multi-beam monopulse signal by using amplitude comparison direction finding table - Google Patents
Direction finding method for realizing multi-beam monopulse signal by using amplitude comparison direction finding table Download PDFInfo
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/16—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived sequentially from receiving antennas or antenna systems having differently-oriented directivity characteristics or from an antenna system having periodically-varied orientation of directivity characteristic
- G01S3/22—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived sequentially from receiving antennas or antenna systems having differently-oriented directivity characteristics or from an antenna system having periodically-varied orientation of directivity characteristic derived from different combinations of signals from separate antennas, e.g. comparing sum with difference
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Abstract
The invention discloses a direction finding method for realizing multi-beam monopulse signals by using a amplitude comparison direction finding table, and belongs to the field of electronic reconnaissance. Firstly, after antenna unit arrays are assembled, an automatic test device is used for controlling a turntable to measure antenna patterns of all channels of the antenna arrays; secondly, because each microwave channel is relatively independent, the self-checking source designed in the microwave front end is utilized to finish amplitude correction on the microwave front end and the frequency conversion channel at the same time; thirdly, extracting the data of the N antenna pattern, subtracting the data of the N-1 antenna pattern and the data of the N+1 antenna pattern respectively to obtain the data of the amplitude comparison direction-finding table of the wave beam N, and loading the data into digital signal processing; and finally, according to the multi-beam digital channelized detection result, forming full pulse information of the beam N pulse signal, simultaneously guiding N-1 and N+1 beams by single pulse to perform amplitude measurement, calculating the amplitude difference of the single pulse signal between the beam N and the beam N-1 or between the beam N+1, and searching a corresponding amplitude comparison direction-finding table by using the amplitude difference to obtain a single pulse incident signal direction-finding result.
Description
Technical Field
The invention belongs to the field of electronic reconnaissance, and particularly relates to a direction finding method for realizing multi-beam monopulse signals by using a amplitude comparison direction finding table.
Background
With the continuous development of software radio technology and the increasing complexity of electromagnetic environment, the role and position of electronic countermeasure in modern war are more and more important, and in particular, the performance requirement on a direction-finding system is higher and higher. The single-pulse passive direction finding precision is one of key indexes with highest confidence in the electronic reconnaissance technology, and directly influences the judgment of target azimuth information, wherein the target azimuth information is an important parameter of functions such as signal sorting, guiding interference, radiation source positioning and the like. Currently used monopulse direction finding methods include a contrast direction finding method, an interferometer direction finding method and a contrast direction finding method.
The interferometer direction finding method has the advantages of high direction finding precision and low volume weight and cost, but the single-base-line interferometer has the problem of phase ambiguity, and a plurality of base lines are required to be combined for ambiguity resolution, so that the requirement on phase consistency among all channels is high, and meanwhile, the space domain co-vision among the antenna arrays is required. The ratio-amplitude ratio phase direction finding method has the advantages of higher direction finding precision, low volume weight, low cost and the like, but similar to the direction finding of an interferometer, the space domain common view between the array antennas is required, and the space domain common view can highlight the contradiction between the antenna gain and the coverage space domain. Compared with the direction finding of an interferometer and the direction finding of a ratio, the direction finding method of the ratio has the characteristics of simple structure, stable performance, strong adaptability to complex environments and the like under the same coverage airspace condition, and meanwhile, the direction finding method of the ratio can greatly improve the antenna gain, thereby improving the detection distance, having the beyond-view-range reconnaissance capability, and simultaneously having stronger anti-interference (multipath effect) capability and multi-beam simultaneous processing capability.
Fan Zhongliang in the article of array monopulse amplitude comparison and interferometer direction finding accuracy comparison, a conventional amplitude comparison direction finding method is studied with great importance, and the method needs to correct antenna processing distortion, mechanical installation errors, beam gain inconsistency, beam normal deviation, beam width change and the like. However, the method greatly increases the correction workload of the system and is not beneficial to the later maintenance and upgrading.
Disclosure of Invention
The invention provides a direction finding method for realizing multi-beam monopulse signals by using a comparison amplitude direction finding table, wherein the conventional comparison amplitude direction finding method is used for correcting antenna processing distortion, mechanical installation errors, beam gain inconsistency, beam normal deviation, beam width change and the like, so that the correction workload of a system is greatly increased, and the later maintenance and upgrading are not facilitated. After the antenna units are assembled, antenna pattern measurement is carried out on all channels of the antenna array, and amplitude correction is carried out on all microwave front ends and frequency conversion channels. And generating a comparison direction-finding table by utilizing the difference value of the actually measured directional diagrams of the channels and the adjacent channels, loading the comparison direction-finding table into digital signal processing, and carrying out comparison direction-finding table by the digital signal processing according to the amplitude difference value between the channels in the detection data, thereby solving the problems.
The technical scheme for realizing the invention is as follows: a direction finding method for realizing multi-beam monopulse signals by using a amplitude comparison direction finding table comprises the following steps:
step 1, measuring all channel antenna patterns, and correcting the amplitudes of the microwave front end and the variable frequency channel at the same time:
after the antenna units are assembled, the control rotary table performs antenna pattern measurement on all channels of the antenna array; storing antenna pattern data of L frequency points of K channels into K multiplied by L data files in dat format, naming the data files in dat format according to the channel+frequency point mode, and transferring to step 2; meanwhile, the amplitudes of the front end of the microwave and the variable frequency channel are corrected, and the step 4 is carried out.
Step 2, generating a left-right beam difference value according to the antenna pattern data:
extracting all channel antenna pattern data files of each frequency point by utilizing Matlab, subtracting the beam channel antenna pattern data from the adjacent left and right channel antenna pattern data to obtain the difference value between all beam channels and the left and right beams, and turning to the step 3.
Step 3, generating all beam amplitude comparison direction-finding tables according to adjacent beam difference values:
searching a linear region of the adjacent beam difference by utilizing Matlab, and extracting and generating an effective data segment of a comparison range direction-finding table; and (6) fitting out the angle according to the amplitude resolution, generating a comparison amplitude direction-finding table, and turning to the step (6).
And 4, completing amplitude correction on the microwave front end and the variable frequency channel by utilizing a self-checking source designed in the microwave front end, generating a channel amplitude calibration table, and turning to step 5.
Step 5, calibrating the beam amplitude obtained by digital channelized detection and the left and right beam amplitudes according to the channel amplitude calibration table to obtain a left and right beam amplitude difference value:
and (3) forming full pulse information of a beam N pulse signal according to a multi-beam digital channelized detection result, simultaneously guiding N-1 and N+1 beams by a single pulse to carry out amplitude measurement, calibrating the beam amplitude and the left and right beam amplitudes by using a channel amplitude calibration table to obtain a left and right beam amplitude difference value, and turning to step 6.
Step 6, searching a comparison amplitude direction-finding table by utilizing the left and right wave beam amplitude difference values to obtain a single pulse incident signal direction-finding result:
and calculating the amplitude difference of the single pulse signal between the beam N and the beam N-1 or between the beam N and the beam n+1, and searching a corresponding amplitude comparison direction-finding table by utilizing the single pulse frequency information and the amplitude difference to obtain a single pulse incident signal direction-finding result.
Compared with the prior art, the invention has the remarkable advantages that:
1) By measuring each beam pattern of the antenna array units after the array is assembled, the amplitude correction is independently carried out on the front end of the microwave and the variable frequency channel, so that the normal workload of the conventional amplitude comparison direction finding method is reduced, and meanwhile, the equipment maintenance and the equipment upgrading are facilitated.
2) The current beam amplitude and direction finding table can be extracted by subtracting the current beam from the antenna pattern data of the left and right adjacent beams.
3) The current beam full pulse information is used for guiding the left and right beams to measure the amplitude and calculating the amplitude difference between the current beam and the left and right beams, and the amplitude difference is used for searching the corresponding amplitude comparison direction-finding table, so that the direction-finding result of the single pulse incident signal can be obtained.
Drawings
Fig. 1 is a flow chart of a direction finding method for realizing multi-beam monopulse signals by using a amplitude-comparison direction finding table.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without creative efforts, are within the scope of the present invention based on the embodiments of the present invention.
The technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to base the implementation of those skilled in the art, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the scope of protection claimed by the present invention.
The following describes the specific embodiments, technical difficulties and inventions of the present invention in further detail in connection with the present design examples.
According to the direction finding method for realizing the multi-beam single pulse signal by using the amplitude comparison direction finding table, firstly, after antenna units are assembled, an automatic test device is used for controlling a turntable to carry out antenna pattern measurement on all channels of the antenna array, and as each microwave channel is relatively independent, a self-detection source designed in a microwave front end is used for simultaneously completing amplitude correction on the microwave front end and a frequency conversion channel. Then, the N-th antenna pattern data is extracted, the N-1 antenna pattern data and the N+1 antenna pattern data are subtracted to obtain the amplitude comparison direction-finding table data of the wave beam N, and the amplitude comparison direction-finding table data is loaded into digital signal processing. And finally, according to the multi-beam digital channelized detection result, forming full pulse information of the beam N pulse signal, simultaneously guiding N-1 and N+1 beams by single pulse to perform amplitude measurement, calculating the amplitude difference of the single pulse signal between the beam N and the beam N-1 or between the beam N+1, and searching a corresponding amplitude comparison direction-finding table by using the amplitude difference to obtain a single pulse incident signal direction-finding result.
According to the method, the wave beam patterns of the antenna array units after the array is measured, the amplitude correction is independently carried out on the microwave front end and the frequency conversion channel, the normal workload of a conventional amplitude comparison direction finding method is reduced, equipment maintenance and upgrading are facilitated, the current wave beam amplitude comparison direction finding table is extracted through subtracting the current wave beam and the left and right adjacent wave beam antenna pattern data, the left and right wave beam amplitude measurement is guided through the current wave beam full pulse information, the amplitude difference between the current wave beam and the left and right wave beams is calculated, and the corresponding amplitude comparison direction finding table is searched by the amplitude difference, so that the single-pulse incident signal direction finding result can be obtained.
Referring to fig. 1, the direction finding method for realizing the multi-beam monopulse signal by using the amplitude comparison direction finding table comprises the following steps:
and step 1, after the antenna units are assembled, controlling the rotary table to measure the antenna pattern of all channels of the antenna array. And (2) storing antenna pattern data of L frequency points of the K channels into K multiplied by L data files in dat format, naming the data files in dat format according to the channel+frequency point mode, and turning to step (2). Meanwhile, the amplitudes of the front end of the microwave and the variable frequency channel are corrected, and the step 4 is carried out.
And 2, reading antenna pattern data, generating left and right beam differences, extracting all channel antenna pattern data files of the current frequency point by utilizing Matlab software frequency point by frequency point, and subtracting all beam channel antenna pattern data from adjacent left and right channel antenna pattern data to obtain all beam channels and left and right beam differences.
And 21, selecting a frequency point, and reading all channel antenna pattern data files of the current frequency point by utilizing Matlab.
And 22, extracting antenna pattern data of a left near side lobe, m direction-finding beams and a right near side lobe.
And step 23, subtracting the antenna pattern data of the left and right beams from the m direction-finding beams to obtain the difference value between the m direction-finding beams and the left and right beams.
And step 3, generating all beam amplitude comparison direction-finding tables according to the adjacent beam difference values. And searching a linear region of the adjacent beam difference by utilizing Matlab, and extracting and generating effective data segments of the amplitude comparison direction-finding table. And fitting out the angle according to the amplitude resolution, and generating a comparison amplitude direction-finding table.
And 31, respectively drawing difference directional diagrams of m direction-finding beams and left and right beams of the current frequency point.
And step 32, respectively searching linear regions in the m left and right difference directional diagrams, and manually extracting the direction coordinates of three points, namely a cross point a, a left difference curve minimum point b and a right difference curve minimum point c of the left and right difference curves in the linear regions.
And 33, calculating the difference value between the point a direction coordinate and the point b direction coordinate of each left and right difference value directional diagram, calculating the difference value between the point c direction coordinate and the point a direction coordinate of the left and right difference value directional diagram, and selecting one section with smaller difference value of two sections of coordinates as the angle range of the left and right beam ratio width for each direction-finding beam.
And step 34, extracting effective data segments of the left-right beam differences according to the angle ranges of the left-right beam ratio of each direction-finding beam.
And 35, performing linear interpolation fitting on the effective data segments of the left and right beam differences of each direction-finding beam according to the amplitude resolution.
And 36, intercepting a part of corresponding angle values of which the amplitude difference value data is greater than 0 after fitting as effective data of the amplitude comparison direction-finding table, and filling the left side direction-finding table and the right side direction-finding table of the beam with the maximum value and the minimum value of the corresponding angles of the part respectively to ensure that the amplitude comparison direction-finding table is continuous in the traversing range of the amplitude difference value.
And 37, generating a ratio amplitude direction-finding table of all direction-finding beams of the current frequency point according to the left-to-right order of the beams.
Step 38, selecting the next frequency point, and repeating the steps 31-37 until the comparison range direction-finding table of all the frequency points is completed.
And 39, converting all the amplitude comparison direction-finding table data into complementary codes to generate a coe format file.
And 4, completing amplitude correction on the microwave front end and the variable frequency channel by utilizing a self-checking source designed in the microwave front end, and generating a channel amplitude calibration table.
Step 41, selecting P frequency points in the measurement bandwidth according to fixed frequency stepping, and measuring all channel amplitudes of the P frequency points in the bandwidth by utilizing a self-checking source designed in the microwave front end.
And 42, obtaining amplitude differences between other beams and the direction-finding beam 1 by taking the amplitude of the direction-finding beam 1 as a reference, and generating an amplitude calibration table of P frequency points in all beam bandwidths.
And step 5, calibrating the beam amplitude obtained by digital channelized detection and the left and right beam amplitudes according to the channel amplitude calibration table to obtain a left and right beam amplitude difference value.
And step 51, forming full pulse information of the beam N pulse signals according to the multi-beam digital channelized detection result.
And 52, guiding the left and right beams and the side lobe beams by the beam N pulse signals to measure the amplitudes, and calibrating the beam amplitudes and the left and right beam amplitudes by using a channel amplitude calibration table.
And 53, eliminating false information of the beam N pulse signal according to the amplitude magnitude relation of the beam N pulse signal, the left beam, the right beam and the side lobe beam.
And step 54, calculating the amplitude difference between the beam N and the beam N-1 or the beam n+1 of the single pulse signal to obtain a left-right beam amplitude difference.
And step 6, searching a comparison amplitude direction-finding table by utilizing the single pulse frequency information and the left and right wave beam amplitude difference values to obtain a single pulse incident signal direction-finding result.
Step 61, finding out a comparison amplitude direction-finding table of the corresponding frequency band according to the frequency information of the single pulse signal.
And step 62, searching a comparison direction-finding table of the corresponding frequency band according to the left-right wave beam amplitude difference value of the single pulse signal to obtain a direction-finding result of the single pulse incident signal.
By the method, extraction of the amplitude-comparison direction-finding table and acquisition of the single-pulse direction-finding result in the multi-beam amplitude-comparison direction-finding system can be realized, the normal workload of the conventional amplitude-comparison direction-finding method is reduced, equipment maintenance and upgrading are facilitated, and the beyond-vision-distance detection capability of equipment is improved.
Examples:
the 1 amplitude comparison direction-finding system is provided with 3 direction-finding beams, 1 left near side lobe and 1 right near side lobe, the detection frequency range is 300MHz to 2000MHz, and signals are incident from the beam 1. The amplitude comparison direction-finding system enters a direction-finding method for realizing multi-beam single-pulse signals by using an amplitude comparison direction-finding table, and the method comprises the following steps of:
and step 1, after the antenna units are assembled, 171 frequency points in a measurement bandwidth are selected according to 10MHz frequency stepping, and the rotary table is controlled to measure the antenna pattern of all channels of the antenna array. And storing antenna pattern data of all 5 channels 171 frequency points into data files of 5 multiplied by 171 dat formats, naming the data files of the dat formats according to the channel+frequency point mode, and turning to step 2. Meanwhile, the amplitudes of the front end of the microwave and the variable frequency channel are corrected, and the step 4 is carried out.
And 2, reading antenna pattern data, generating left and right beam differences, extracting all channel antenna pattern data files of the current frequency point by utilizing Matlab software frequency point by frequency point, and subtracting all beam channel antenna pattern data from adjacent left and right channel antenna pattern data to obtain all beam channels and left and right beam differences.
And 21, selecting a frequency point, and reading all channel antenna pattern data files of the current frequency point by using Matlab software.
And 22, extracting antenna pattern data of a left near side lobe, 3 direction-finding beams and a right near side lobe.
And step 23, subtracting the antenna pattern data of the left and right beams from the 3 direction-finding beams respectively to obtain difference data of the 3 direction-finding beams and the left and right beams.
And step 3, generating all beam amplitude comparison direction-finding tables according to the adjacent beam difference values. And searching a linear region of the adjacent beam difference by utilizing Matlab, and extracting and generating effective data segments of the amplitude comparison direction-finding table. And fitting out the angle according to the amplitude resolution, and generating a comparison amplitude direction-finding table.
And 31, respectively drawing difference directional diagrams of 3 direction-finding beams and left and right beams of the current frequency point.
And step 32, respectively searching the linear regions in the 3 left and right difference directional diagrams, and manually extracting the direction coordinates of the three points, namely the intersection point a, the minimum value point b and the minimum value point c of the left and right difference curves in the linear regions.
And 33, calculating the difference value between the point a direction coordinate and the point b direction coordinate of each left and right difference value directional diagram, calculating the difference value between the point c direction coordinate and the point a direction coordinate of the left and right difference value directional diagram, and selecting one section with smaller difference value of two sections of coordinates as the angle range of the left and right beam ratio width for each direction-finding beam.
And step 34, extracting effective data segments of the left-right beam differences according to the angle ranges of the left-right beam ratio of each direction-finding beam.
And 35, performing linear interpolation fitting on the effective data segments of the left and right beam differences of each direction-finding beam according to the amplitude resolution.
And 36, intercepting a part of corresponding angle values of which the amplitude difference value data is greater than 0 after fitting as effective data of the amplitude comparison direction-finding table, and filling the left side direction-finding table and the right side direction-finding table of the beam with the maximum value and the minimum value of the corresponding angles of the part respectively to ensure that the amplitude comparison direction-finding table is continuous in the traversing range of the amplitude difference value.
And 37, generating a ratio amplitude direction-finding table of all direction-finding beams of the current frequency point according to the left-to-right order of the beams.
Step 38, selecting the next frequency point, and repeating the steps 31-37 until the comparison range direction-finding table of all the frequency points is completed.
And 39, converting all the amplitude comparison direction-finding table data into complementary codes, generating a coe format file, and downloading the file to the signal processing FPGA software.
And 4, completing amplitude correction on the microwave front end and the variable frequency channel by utilizing a self-checking source designed in the microwave front end, and generating a channel amplitude calibration table.
Step 41, selecting 171 frequency points in the measurement bandwidth according to the frequency step of 10MHz, and measuring all channel amplitudes of the 171 frequency points in the bandwidth by using a self-checking source designed in the microwave front end.
And 42, obtaining amplitude differences between other beams and the direction-finding beam 1 by taking the amplitude of the direction-finding beam 1 as a reference, and generating an amplitude calibration table of 171 frequency points in all beam bandwidths.
And 43, downloading the amplitude calibration table to a beam digital channelized detection FPGA program.
And step 5, calibrating the beam amplitude obtained by digital channelized detection and the left and right beam amplitudes according to the channel amplitude calibration table to obtain a left and right beam amplitude difference value.
And step 51, forming full pulse information of the beam 1 pulse signal according to the multi-beam digital channelized detection result.
And 52, guiding the left and right beams and the side lobe beams by the beam 1 pulse signals to measure the amplitudes, and calibrating the beam amplitudes and the left and right beam amplitudes by using a channel amplitude calibration table.
And 53, eliminating false information of the beam 1 pulse signal according to the amplitude magnitude relation of the beam 1 pulse signal, the left beam, the right beam and the side lobe beam.
And 54, transmitting the wave beam full pulse information with the false comparison amplitude removed to the signal processing FPGA software in real time through a high-speed serial port.
And step 55, calculating the amplitude difference between the single pulse signal and the left side lobe or the beam 2 to obtain a left-right beam amplitude difference.
And step 6, searching a comparison amplitude direction-finding table by utilizing the single pulse frequency information and the left and right wave beam amplitude difference values to obtain a single pulse incident signal direction-finding result.
Step 61, finding out a comparison amplitude direction-finding table of the corresponding frequency band according to the frequency information of the single pulse signal.
And step 62, searching a comparison direction-finding table of the corresponding frequency band according to the left-right wave beam amplitude difference value of the single pulse signal to obtain a direction-finding result of the single pulse incident signal.
Claims (6)
1. A direction finding method for realizing multi-beam monopulse signals by using a amplitude comparison direction finding table is characterized by comprising the following steps:
step 1, measuring all channel antenna patterns, and correcting the amplitudes of the microwave front end and the variable frequency channel at the same time:
after the antenna units are assembled, the control rotary table performs antenna pattern measurement on all channels of the antenna array; storing antenna pattern data of L frequency points of K channels into K multiplied by L data files in dat format, naming the data files in dat format according to the channel+frequency point mode, and transferring to step 2; meanwhile, correcting the amplitudes of the front end of the microwave and the variable frequency channel, and switching to the step 4;
step 2, generating a left-right beam difference value according to the antenna pattern data:
extracting all channel antenna pattern data files of each frequency point by utilizing Matlab, subtracting the beam channel antenna pattern data from the adjacent left and right channel antenna pattern data to obtain the difference value between all beam channels and the left and right beams, and turning to the step 3;
step 3, generating all beam amplitude comparison direction-finding tables according to adjacent beam difference values:
searching a linear region of the adjacent beam difference by utilizing Matlab, and extracting and generating an effective data segment of a comparison range direction-finding table; fitting an angle according to the amplitude resolution ratio, generating a comparison amplitude direction-finding table, and turning to the step 6;
step 4, completing amplitude correction on the microwave front end and the variable frequency channel simultaneously by utilizing a self-checking source designed in the microwave front end, generating a channel amplitude calibration table, and turning to step 5;
step 5, calibrating the beam amplitude obtained by digital channelized detection and the left and right beam amplitudes according to the channel amplitude calibration table to obtain a left and right beam amplitude difference value:
according to the multi-beam digital channelized detection result, forming full pulse information of a beam N pulse signal, simultaneously guiding N-1 and N+1 beams by a single pulse to perform amplitude measurement, calibrating the beam amplitude and the left and right beam amplitudes by using a channel amplitude calibration table to obtain a left and right beam amplitude difference value, and turning to step 6;
step 6, searching a comparison amplitude direction-finding table by utilizing the left and right wave beam amplitude difference values to obtain a single pulse incident signal direction-finding result:
and calculating the amplitude difference of the single pulse signal between the beam N and the beam N-1 or between the beam N and the beam n+1, and searching a corresponding amplitude comparison direction-finding table by utilizing the single pulse frequency information and the amplitude difference to obtain a single pulse incident signal direction-finding result.
2. The direction finding method for realizing multi-beam monopulse signals by using a ratio amplitude direction finding table according to claim 1, wherein in step 2, a left-right beam difference value is generated according to antenna pattern data, specifically:
step 21, selecting a frequency point, and reading all channel antenna pattern data files of the current frequency point by utilizing Matlab;
step 22, extracting antenna pattern data of a left near side lobe, m direction-finding beams and a right near side lobe;
and step 23, subtracting the antenna pattern data of the left and right beams from the m direction-finding beams to obtain the difference value between the m direction-finding beams and the left and right beams.
3. The direction finding method for realizing multi-beam monopulse signals by using a ratio amplitude and direction finding table according to claim 2, wherein in step 3, all beam ratio amplitude and direction finding tables are generated according to adjacent beam difference values, specifically:
step 31, respectively drawing difference directional diagrams of m direction-finding beams and left and right beams of the current frequency point;
step 32, respectively searching linear regions in the m left and right difference directional diagrams, and manually extracting the direction coordinates of a cross point a, a left difference curve minimum point b and a right difference curve minimum point c of a left difference curve and a right difference curve in the linear regions;
step 33, calculating the difference value between the point a direction coordinate and the point b direction coordinate of each left and right difference value directional diagram, calculating the difference value between the point c direction coordinate and the point a direction coordinate of each left and right difference value directional diagram, and selecting one section with smaller difference value of two sections of coordinates as the angle range of the specific amplitude of the left and right beams for each direction-finding beam;
step 34, extracting effective data segments of the difference values of the left beam and the right beam according to the angle range of the ratio of the left beam to the right beam of each direction-finding beam;
step 35, performing linear interpolation fitting on the effective data segments of the left and right beam differences of each direction-finding beam according to the amplitude resolution;
step 36, intercepting a part of corresponding angle values of which the amplitude difference value data is greater than 0 after fitting as effective data of the amplitude comparison direction-finding table, and filling the left side direction-finding table and the right side direction-finding table of the wave beam with the maximum value and the minimum value of the corresponding angles of the part respectively to ensure that the amplitude comparison direction-finding table is continuous in the traversing range of the amplitude difference value;
step 37, generating a ratio amplitude direction-finding table of all direction-finding beams of the current frequency point according to the left-to-right order of the beams;
step 38, selecting the next frequency point, and repeating the steps 31-37 until the comparison range direction-finding table of all the frequency points is completed;
and 39, converting all the amplitude comparison direction-finding table data into complementary codes to generate a coe format file.
4. The direction finding method for realizing multi-beam single pulse signal by using amplitude comparison direction finding table according to claim 3, wherein in step 4, amplitude correction is simultaneously completed for microwave front end and frequency conversion channel by using self-checking source designed in microwave front end, and channel amplitude calibration table is generated specifically as follows:
step 41, selecting P frequency points in the measurement bandwidth according to fixed frequency stepping, and measuring all channel amplitudes of the P frequency points in the bandwidth by utilizing a self-checking source designed in a microwave front end;
and 42, obtaining amplitude differences between other beams and the direction-finding beam 1 by taking the amplitude of the direction-finding beam 1 as a reference, and generating an amplitude calibration table of P frequency points in all beam bandwidths.
5. The direction finding method for realizing multi-beam monopulse signals by using a ratio amplitude direction finding table according to claim 1, wherein in step 5, according to a channel amplitude calibration table, the beam amplitude obtained by digital channelized detection and the left and right beam amplitudes are calibrated to obtain a left and right beam amplitude difference value, specifically comprising:
step 51, forming full pulse information of a beam N pulse signal according to the multi-beam digital channelized detection result;
step 52, the beam N pulse signal guides the left and right beams and the side lobe beams to carry out amplitude measurement, and the beam amplitude and the left and right beam amplitudes are calibrated by utilizing a channel amplitude calibration table;
step 53, eliminating false information of the beam N pulse signal according to the amplitude magnitude relation of the beam N pulse signal, the left beam, the right beam and the side lobe beam;
and step 54, calculating the amplitude difference between the beam N and the beam N-1 or the beam n+1 of the single pulse signal to obtain a left-right beam amplitude difference.
6. The method for realizing direction finding of multi-beam single pulse signals by using a comparison amplitude direction finding table according to claim 1, wherein step 6 finds the comparison amplitude direction finding table by using single pulse frequency information and left and right beam amplitude difference values to obtain a single pulse incident signal direction finding result, specifically comprising:
step 61, finding out a comparison amplitude direction-finding table of the corresponding frequency band according to the frequency information of the single pulse signal;
and step 62, searching a comparison direction-finding table of the corresponding frequency band according to the left-right wave beam amplitude difference value of the single pulse signal to obtain a direction-finding result of the single pulse incident signal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110980A (en) * | 2023-10-23 | 2023-11-24 | 中国航天科工集团八五一一研究所 | FPGA-based self-adaptive monopulse direction finding method |
| CN117289202A (en) * | 2023-11-27 | 2023-12-26 | 中国航天科工集团八五一一研究所 | Self-adaptive phase difference measurement method |
| CN118226374A (en) * | 2024-05-27 | 2024-06-21 | 中国航天科工集团八五一一研究所 | Multi-pulse accumulation positioning method based on single-station interferometer system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110980A (en) * | 2023-10-23 | 2023-11-24 | 中国航天科工集团八五一一研究所 | FPGA-based self-adaptive monopulse direction finding method |
| CN117110980B (en) * | 2023-10-23 | 2024-01-12 | 中国航天科工集团八五一一研究所 | FPGA-based self-adaptive monopulse direction finding method |
| CN117289202A (en) * | 2023-11-27 | 2023-12-26 | 中国航天科工集团八五一一研究所 | Self-adaptive phase difference measurement method |
| CN117289202B (en) * | 2023-11-27 | 2024-02-13 | 中国航天科工集团八五一一研究所 | Self-adaptive phase difference measurement method |
| CN118226374A (en) * | 2024-05-27 | 2024-06-21 | 中国航天科工集团八五一一研究所 | Multi-pulse accumulation positioning method based on single-station interferometer system |
| CN118226374B (en) * | 2024-05-27 | 2024-09-17 | 中国航天科工集团八五一一研究所 | Multi-pulse accumulation positioning method based on single-station interferometer system |
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