CN105137403A - Quick detection method for high-frequency sky wave radar of moving object at sea - Google Patents
Quick detection method for high-frequency sky wave radar of moving object at sea Download PDFInfo
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- CN105137403A CN105137403A CN201510490920.0A CN201510490920A CN105137403A CN 105137403 A CN105137403 A CN 105137403A CN 201510490920 A CN201510490920 A CN 201510490920A CN 105137403 A CN105137403 A CN 105137403A
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- threshold
- range
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- isolated
- range gate
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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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
Abstract
The invention discloses a quick detection method for a high-frequency sky wave radar of a moving object at sea, and the method comprises the following steps: building a monitoring threshold G; searching all distance units passing through the detection threshold G, and passing the step 1; judging whether the distance units at step 1 are adjacent to each other or not; passing the step 2 if the distance units are isolated; determining whether the isolated distance units passing the step 2 are located at positive and negative Bragg peaks or at a position of '0 Doppler frequency ' or not; passing the step 3 if the isolated distance units passing the step 2 are not located at positive and negative Bragg peaks or at the position of '0 Doppler frequency ', and determining that there is the moving object within a distance threshold. The method can effectively reduce the echo broadening and ghost caused by ionized layer pollution, eliminates all false alarms, and can detect any one moving object quickly.
Description
Technical field
The present invention relates to movement overseas order object detection method, be specifically related to a kind of method for quick of the HF skywave radar to movement overseas target.
Background technology
The difficulty that HF skywave radar is used for detecting Ship Target is mainly reflected in: ship velocity is far below aircraft, and its Doppler's peak value often just near Bragg peak, and is usually flooded by sea clutter; The intensive use of high band (3-30MHz) in most of time section, causes frequently " Radio frequency interference (RFI) (RFI) "; Atmospheric noise and thunder and lightning " glitch " can be subject to during sky wave propagation, ionosphere " pollution " can be subject to through ionosphere; This radar range resolution and bearing resolution are all poor.
HF skywave radar also has its favourable one side: the pulse coherency of transmitting is good, frequency and phase stabilization.Echo signal distinguishes at frequency domain by the Doppler shift that target travel can be utilized to produce.The naval vessel of current HF skywave radar detects and has been proved to be a feasible technology, to ship navigation, prevents the aspects such as ship collision from can play a role; And in Radio oceanography field, also need the signal distinguishing belonging to naval vessel in the echo spectrum of high frequency sea out, again to eliminate.
Because sky-wave OTH radar monitoring area is vast, the data of collection are very huge often, how from the data gathered, to detect that moving target is that HF skywave radar naval vessel detects the subject matter faced fast and accurately.
Summary of the invention
For solving the problem, the invention provides a kind of method for quick of the HF skywave radar to movement overseas target, can monitor from folded Clutter in Skywave Radars large area and accurately differentiate with or without moving target the huge data that obtain, and then determine the speed that target travels
For achieving the above object, the technical scheme that the present invention takes is:
To a method for quick for the HF skywave radar of movement overseas target, comprise the steps:
S0, utilize the sample frequency of 5.6MHz, collect the two paths of data that odd even is alternate, mutually orthogonal; Extract 512 echoes from each resident wave beam, weighting function Chebyshev window is carried out fast Flourier g conversion to it, is obtained the power spectrum chart of each range gate after suppressing pulse pressure secondary lobe; Choosing 8 adjacent range gate is averaged as real-time threshold G;
S1, find out all by detecting the range unit of threshold G, by step S1;
S2, judge whether by the range unit of step S1 be neighbor distance unit, if isolated range unit is by step S2, otherwise return step S1;
S3, determine whether by the isolated range unit of step S2 be positive and negative Bragg peak position or " 0 Doppler frequency " position, if not, by step S3, determine there is moving target in this range gate simultaneously.
The present invention has following beneficial effect:
Effectively can reduce the echo broadening because ionosphere contamination causes and ghost image, all false-alarms are excluded, and any one moving target can detect fast.
Accompanying drawing explanation
Fig. 1 is testing result when threshold level is 0.2 in the embodiment of the present invention.
Fig. 2 is the testing result (part) when threshold level is 0.15 in the embodiment of the present invention.
Fig. 3 is the doppler spectral containing target of certain range unit in the embodiment of the present invention.
Fig. 4 deducts the doppler spectral spectrum after comparison threshold containing the range unit of target in the embodiment of the present invention.
Fig. 5 is the process flow diagram of the embodiment of the present invention.
Embodiment
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 5, embodiments provide a kind of method for quick of the HF skywave radar to movement overseas target, comprise the steps:
S0, utilize the sample frequency of 5.6MHz, collect the two paths of data that odd even is alternate, mutually orthogonal; Extract 512 echoes from each resident wave beam, weighting function Chebyshev window is carried out fast Flourier g conversion to it, is obtained the power spectrum chart of each range gate after suppressing pulse pressure secondary lobe; Choosing 8 adjacent range gate is averaged as real-time threshold G;
S1, find out all by detecting the range unit of threshold G, by step S1;
S2, judge by step S1 range unit whether be neighbor distance unit, if isolated range unit is by step S2, otherwise return step S1;
S3, determine whether by the isolated range unit of step S2 be positive and negative Bragg peak position or " 0 Doppler frequency " position, if not, by step S3, determine there is moving target in this range gate simultaneously.
In the data having thousands of range gate (across more than 1,000 kilometers), if getting threshold level is 0.2, detect to only have 2 range gate to exceed comparison threshold after working procedure at once, a, b as Fig. 1 are the doppler spectral spectrogram of the 1st range gate be detected before and after comparing, and c, d of Fig. 1 are the doppler spectral spectrogram of the 2nd range gate be detected before and after comparing; But by analysis, b, d of Fig. 1 are not moving target, but due to detected range gate land return peak value and close on the variant result caused of land return peak value of range gate.If getting threshold level is 0.15,14 range gate are had to be detected very soon, similar wherein except some and Fig. 1, outside the difference of land return peak value causes, other is then formed, as shown in a, b of Fig. 2 by the peak value difference at the left and right Bragg peak of different distance unit.Be cause by the left side Bragg peak value of detected unit is different with the Bragg peak value closing on range unit, c, d of Fig. 2 cause by the right Bragg peak value of detected unit is different with the Bragg peak value closing on range gate.These 14 range gate exceeding comparison threshold have many places to be that neighbor distance door is detected simultaneously, and target can not occupy several range gate, also illustrates that they can not be that moving target causes.
Further reduction detects threshold, using 0.1 as threshold level, after working procedure, 64 range gate are had to show especially out very soon, 4 range gate are wherein had to be isolated, other 60 have neighbor distance door to be together detected its threshold level position or in " zero-frequency " position, or at left and right Bragg peak value place, all with not moving target similar shown in Fig. 1 or Fig. 2; And detect 4 isolated range gate only have the threshold level position of 1 range gate not at these specific positions, it is exactly range gate shown in Fig. 3.Be that 0.167Hz place has a signal in the Doppler frequency of this range gate, because there is the Doppler frequency difference of 0.185Hz at this signal and nearer positive Bragg peak, this frequency difference much larger than Doppler frequency resolution (0.03Hz), therefore can regard as a moving target.
Two Bragg peaks of all range gate are all the same, and left and right Bragg peak is respectively at-0.44Hz and 0.43Hz place, and two peak mid point-0.005Hz are " zero-frequency " point.And the theoretical value at the Bragg peak calculated by formula (1) is ± 0.436Hz, Actual measurement value and calculated value are substantially identical.The Doppler frequency of target and " zero-frequency " differ 0.611Hz, are 18.00 kms by the be easy to get speed per hour of this moving target of (2) formula.
The doppler spectral of Fig. 3 composes the broadening remaining with ionosphere contamination and cause, now need not take measures in addition to eliminate them, because there is similar ionosphere " pollution " in comparison threshold, can effectively eliminate this broadening after directly subtracting each other by Fig. 3 spectrum and comparison threshold, testing result Fig. 4 demonstrates this point.
Utilize this judgement trace routine, after given threshold level, substantially can accomplish real-time judge has how many suspicious object, then to suspicious object examination one by one again, get rid of false-alarm.If have continuous several range gate to exceed comparison threshold, and doppler position is that generally can get rid of is naval vessel at positive and negative Bragg peak or " zero-frequency " these three specific positions.Only have isolated range gate and position again not in positive and negative Bragg peak and " zero-frequency " part, be only real moving target.Although the broadening having ionosphere contamination to cause is composed in the sea echo of HF skywave radar, but because just consider reduction ionosphere effect when carrying out radar parameter and arranging, when utilizing CFAR treatment technology to carry out judgement detection, again " impact " that ionosphere is caused is removed.Testing result illustrates that CFAR effectively can not only reduce sea clutter, effectively can also reduce the broadening that ionosphere causes, and CFAR is that HF skywave radar carries out naval vessel and detects effective method the most; Signal detection program can be carried out quick judgement to mass data and its rationality designed also is described.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. to a method for quick for the HF skywave radar of movement overseas target, it is characterized in that, comprise the steps:
S0, utilize the sample frequency of 5.6MHz, collect the two paths of data that odd even is alternate, mutually orthogonal; Extract 512 echoes from each resident wave beam, weighting function Chebyshev window is carried out fast Flourier g conversion to it, is obtained the power spectrum chart of each range gate after suppressing pulse pressure secondary lobe; Choosing 8 adjacent range gate is averaged as real-time threshold G;
S1, find out all by detecting the range unit of threshold G, by step S1;
S2, judge whether by the range unit of threshold be neighbor distance unit, if isolated range unit is by step S2, otherwise return step S1;
S3, determine whether by the isolated range unit of step S2 be positive and negative Bragg peak position or " 0 Doppler frequency " position, if not, by step S3, really there is moving target in this range gate simultaneously.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106569188A (en) * | 2016-11-01 | 2017-04-19 | 中国航天科工集团八五研究所 | Ionosphere phase pollution correction algorithm based on improved PGA |
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| US9297886B1 (en) * | 2013-03-12 | 2016-03-29 | Lockheed Martin Corporation | Space time adaptive technique for suppression of spaceborne clutter |
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| CN102967854A (en) * | 2012-12-07 | 2013-03-13 | 中国人民解放军海军航空工程学院 | Multi-fractal detection method of targets in FRFT (Fractional Fourier Transformation) domain sea clutter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106569188A (en) * | 2016-11-01 | 2017-04-19 | 中国航天科工集团八五研究所 | Ionosphere phase pollution correction algorithm based on improved PGA |
| CN106569188B (en) * | 2016-11-01 | 2019-03-05 | 中国航天科工集团八五一一研究所 | Based on the ionosphere phase perturbation correction algorithm for improving PGA |
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