CN102169179A - Ground staring imaging system for hovering platforms - Google Patents
Ground staring imaging system for hovering platforms Download PDFInfo
- Publication number
- CN102169179A CN102169179A CN 201110000522 CN201110000522A CN102169179A CN 102169179 A CN102169179 A CN 102169179A CN 201110000522 CN201110000522 CN 201110000522 CN 201110000522 A CN201110000522 A CN 201110000522A CN 102169179 A CN102169179 A CN 102169179A
- Authority
- CN
- China
- Prior art keywords
- random
- radiation field
- unit
- module
- ground
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention puts forward a ground staring imaging system for hovering platforms. The system comprises a transmitter module, a signal processing module and a receiver module. The transmitter module generates and transmits random signals at a predetermined observation visual angle to form a space-time bidimensional random radiation field. The signal processing module calculates and obtains distribution data of the space-time bidimensional random radiation field through emission signal form of a random radiation source unit, configuration distribution of a transmitter antenna, elevation distance from a transmitter to an overlay region and the observation visual angle. The receiver module is used for receiving scattering echo signals through a receiving antenna unit, associating the scattering echo signals with corresponding input radiation field information, and outputting high resolution inversion image. The above scheme put forward by the invention can realize a ground staring high resolution radar imaging function applied in the hovering platforms, and the function is not supported by the prior art. Large scale staring imaging over the ground can be completed through designing a plurality of work modes.
Description
Technical field
The present invention relates to the imaging technique in radar, microwave remote sensing and precise guidance field, particularly, the gaze imaging system over the ground of the platform that the present invention relates to be used to hover.
Background technology
The platform that hovers carries platform as various electronic equipments, is applied in practice at aspects such as space early warning, battlefield surveillance, electronic countermeasures.The platform that hovers can carry systems such as various remote sensing, early warning, interference, scouting, has long, advantage such as load-carrying ability is strong, and the overlay area is wide, expense is cheap of hang time.
Staring under the image-forming condition of observation, radar system and observation area internal object keep relative static conditions, and this moment, real aperture radar system was a kind of known radar system.Traditional real aperture imaging radar system comprises beam scanning radar system, phased array radar system and focal plane imaging radar system etc.The reality aperture radar system is provided with the extensive true array of transmitting-receiving array element, comes target is carried out imaging by the big observation aperture of the synthetic formation of wave beam.Because the influence of array antenna beam effect will obtain high-resolution inversion chart picture, need to increase the horizontal aperture of array, cause the array scale excessive, cost is too expensive.Under the restricted situation of the volume and weight of the platform that hovers, beam scanning radar system applies in the realizability of the platform that hovers a little less than.In addition, because the restriction of beam coverage, the beam scanning radar system need utilize the mechanical scanning mode to change beam direction; Phased array radar system the computerized control formation and the scanning of wave beam; The focal plane imaging radar system is then utilized the burnt partially multi-beam that realizes of antenna array, utilizes a plurality of " feeds " that the observation area is shone simultaneously then.As if the staring imaging of finishing with traditional real aperture radar system over the ground on a large scale, systems technology requires and the cost cost will increase greatly, and imaging resolution is limited by the aperture of antenna.
Therefore, be necessary to propose a kind of otherwise effective technique scheme, what solve the platform that is difficult in the prior art to support to be applied to hover stares high resolution radar imaging, the problem of staring imaging on a large scale over the ground.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly by introducing at the platform that hovers based on the space-time bidimensional high-resolution microwave staring imaging method of radiation field at random, being embodied as the platform that hovers provides the imaging function of high spatial resolution on a surface target.
The embodiment of the invention has proposed a kind of gaze imaging system over the ground of the platform that is used to hover, and comprises transmitter module, signal processing module and receiver module,
Described transmitter module, described transmitter module comprises radiation source unit and transmission antenna unit at random, described radiation source unit at random is used for producing and the emission random signal with predetermined observation visual angle, described transmission antenna unit is by the actinal surface field of heterogeneous centrical antenna to external radiation formation stochastic distribution, with forming space-time bidimensional radiation field at random in beam coverage area behind the spatial transmission;
Described signal processing module, link to each other with described transmitter module, the form that transmits, transmitter antenna configuration by radiation source unit at random distributes, transmitter to the elevation distance of areal coverage, observe the visual angle, calculate the described space-time bidimensional distributed data of radiation field at random, by to the described space-time bidimensional precise calibration of radiation field distribution at random, with described space-time bidimensional at random the radiation field distribution data be input to described receiver module;
Receiver module, be used for receiving the scatter echo signal according to the receiving antenna unit of described receiver module, to the described space-time bidimensional of described scatter echo signal and described signal processing module input at random radiation field distribution information carry out the association process cell processing, output high-resolution inversion image.
According to embodiments of the invention, described radiation source unit at random is used for comprising following any one pattern with predetermined angle of view generation and emission random signal:
Described radiation source unit at random is to look mode of operation emission random signal just down;
Described radiation source unit at random is with stravismus mode of operation emission random signal;
Described radiation source unit at random is with big stravismus mode of operation emission random signal.
According to embodiments of the invention, the described mode of operation of looking just down is observation visual angle γ≤1.72 °;
Described stravismus mode of operation is the observation 1.72 °＜γ in visual angle≤75 °;
Described big stravismus mode of operation is the observation 75 °＜γ in visual angle≤86.8 °.
According to embodiments of the invention, described receiver module comprises the receiving antenna unit, echo storage and pretreatment unit and association process unit,
Described receiving antenna unit is used to receive the scattered field rec (t) of described beam coverage area,
Wherein, the area of described beam coverage area is s ',
Be total space-time bidimensional radiation field at random, the target scattering coefficient of described beam coverage area is
Described echo storage and pretreatment unit are used to receive the information and the storage of the output of described receiving antenna unit, the described association process of input unit after the pre-service;
Described association process unit is used for the output radiation field information of described receiving antenna unit output echoed signal and radiation field calculation unit module is carried out the association process unit, obtains high resolution target information by the information reorganization again.
According to embodiments of the invention, the radiation field of single emissive source is:
Described total space-time bidimensional radiation field at random is:
According to embodiments of the invention, under the stravismus mode of operation, high resolving power staring imaging after geometry correction is realized in remote zone:
At first carry out sub-spatial domain and decompose, be equivalent to according to range gate scatter echo is cut apart, obtain a series of sub-echoes;
To each sub-spatial domain, be the transmitter module emission space-time two-dimension radiation field at random of core with radiation source unit at random, sub-echoed signal is exported with described signal processing module carried out the association process unit.Inverting obtains the scattering strength size in each sub-spatial domain so successively;
All sub-spatial domains are spliced, obtain the high resolution radar image in whole stravismus zone.
According to embodiments of the invention, under big strabismus mode, high resolving power staring imaging behind geometry correction and radiometric calibration is carried out in the overlength distance zone:
Beam coverage area is obtained altitude figures, obtain the distortion range of corresponding flat overlay area;
Carry out radiometric calibration, in described signal processing module,, obtain revised inversion chart picture corresponding folded covering, carrying out the association process unit after the radiation field distribution zero setting of shade distortion zone;
Look like to carry out image registration according to elevation map and revised inversion chart, obtain final inversion chart picture.
The such scheme that the present invention proposes, can realize prior art can not support be applied to hover the function of staring the high resolution radar imaging over the ground of platform, by the design of multiple mode of operation, can finish staring imaging on a large scale over the ground.Compare with traditional imaging radar system, the such scheme that the present invention proposes has following one or more advantage:
On the platform that hovers, carry this radar system, utilize, improved staring imaging resolution over the ground based on the space-time bidimensional high-resolution microwave staring imaging of radiation field at random;
The scatter echo signal that signal processing module receives difference constantly and corresponding space-time bidimensional radiation field information at random carry out the association process unit, solved tradition stare in the radar in the same wave beam can not high-resolution imaging a difficult problem;
Imaging system has multiple mode of operation, can finish on a large scale, the staring imaging of high-resolution over the ground in the wide visual field.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is an application scenarios synoptic diagram of the present invention;
Fig. 2 is a radar system block diagram of the present invention;
Fig. 3 is for looking the observation visual angle synoptic diagram of pattern just down;
Fig. 4 is stravismus, the big sub-spatial domain of strabismus mode decomposing schematic representation;
Fig. 5 is the geometry correction synoptic diagram;
Fig. 6 is for because foldedly covering of causing of landform, shadow effect synoptic diagram;
Fig. 7 is the observation visual angle synoptic diagram of big strabismus mode;
Fig. 8 (a) is desirable white Gaussian noise time domain waveform figure at random
Fig. 8 (b) is desirable white Gaussian noise frequency-domain waveform figure at random;
Fig. 9 is the areal coverage radiation field distribution figure of certain gaze duration sampling;
Figure 10 distributes for the areal coverage scattering coefficient;
Figure 11 (a) is the desirable white noise irradiation imaging synoptic diagram of gaze duration sampling 2000 times down;
Figure 11 (b) is the desirable white noise irradiation imaging synoptic diagram of gaze duration sampling 5000 times down;
Figure 12 (a) is the noise FM signal irradiation imaging synoptic diagram of gaze duration sampling 2000 times down;
Figure 12 (b) is the noise FM signal irradiation imaging synoptic diagram of gaze duration sampling 5000 times down.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
Based on the space-time bidimensional microwave staring imaging method of radiation field and association process unit at random, have the actinal surface field of extraordinary random distribution characteristic by structure, form the space radiation field at random that meets specific (special) requirements through propagating in beam coverage area.This moment, aerial radiation was not simple point source radiation, but leggy center radiation, and radiation signal is the random signal through complex modulation, this radiation field has space-time bidimensional random character: in the beam coverage area, radiation field on any two resolution elements all has irrelevant feature, thereby makes different resolution elements show complicated otherness distribution characteristics; Has irrelevant feature equally between the different moment radiation field, this feature has guaranteed on the target object plane the different irradiations that can be subjected to having the radiation field of different otherness distribution characteristicss constantly, and space-time bidimensional random character has constituted the adequate condition of the spatial resolution that realizes surmounting the aperture.When space-time bidimensional when radiation field and target interact at random, target modulation this radiation field with otherness distribution characteristics, therefore not only comprised target scattering characteristics in the scattered field, carried space-time two-dimension radiation field information at random simultaneously, be scattered field when being constant target scattering characteristics to the time radiation field at random that becomes spatial modulation, but make the interior scattered field of wave beam contain the identification space distribution information of target, this information is with the radiation field abundant information degree variation that is directly proportional at random of space-time bidimensional, and this is the core concept that realizes surmounting the spatial resolution of antenna aperture.At this space-time bidimensional at random under the radiation field effect, scattered information receives and treatment technology adopts the related information disposal route of the space-time bidimensional random field that adapts with it, extraction and the decoupling zero of realization to lying in target information in the scattered field.Under equal observation condition, increase along with the irradiation number of times, it is the increase of staring imaging time, but the target identification information that is comprised in the scattered field also increases thereupon, repeatedly the fusion of related information has brought the lifting of spatial resolution, and it provides necessary condition for realizing the spatial resolution that surmounts antenna aperture.
As embodiments of the invention, concrete imaging scene as shown in Figure 1.Radiation field has guaranteed the otherness of association process unit of the different moment used " sample " at random, increases the sampling sample number by the gaze duration accumulation and obtains the high-resolution inversion image.The main body of system constitute comprise with radiation source unit at random be core transmitter module, be the signal processing module of core, be the receiver module of core with the association process unit with radiation field calculation unit.System is by aforementioned body module and corresponding supplementary module, and for example platform control, range observation, image demonstration etc. constitute imaging system jointly.The output terminal of described radiation source unit at random links to each other with the input end of radiation field calculation unit, the output terminal of described radiation field calculation unit links to each other with an input end of association process unit, the output scatter echo of described receiver module links to each other with another input end of association process unit module, and the output terminal of described association process unit module links to each other with image display.The block diagram that system body constitutes as shown in Figure 2.
In order to realize the present invention's purpose, the embodiment of the invention has proposed a kind of gaze imaging system over the ground of the platform that is used to hover, and comprises transmitter module, signal processing module and receiver module.
Described transmitter module comprises radiation source unit and transmission antenna unit at random.Described radiation source unit at random is used for producing and the emission random signal with predetermined observation visual angle, described transmission antenna unit is by the actinal surface field of heterogeneous centrical antenna to external radiation formation stochastic distribution, with forming space-time bidimensional radiation field at random in beam coverage area behind the spatial transmission.
Described signal processing module links to each other with described transmitter module, the form that transmits, transmitter antenna configuration by radiation source unit at random distributes, transmitter to the elevation distance of areal coverage, observe the visual angle, calculate the described space-time bidimensional distributed data of radiation field at random, by to the described space-time bidimensional precise calibration of radiation field distribution at random, with described space-time bidimensional at random the radiation field distribution data be input to described receiver module.
Receiver module is used for the receiving antenna unit and receives the scatter echo signal, and the described space-time bidimensional that receives the input of the described signal processing module intensity distribution data of radiation field at random, described scatter echo signal and corresponding radiation field information are carried out association process unit output high-resolution inversion image.
Particularly, transmitter module: be different from traditional imaging system, the transmitter module of this imaging system is a core with radiation source unit at random, produce and the emission random signal, and by the actinal surface field of heterogeneous centrical antenna, with forming space-time bidimensional radiation field at random in beam coverage area behind the spatial transmission to external radiation formation stochastic distribution.
Signal processing module: this module is a core with radiation field calculation unit.The output terminal of radiation source unit links to each other with the input end of radiation field calculation unit at random, with the form that transmits, the transmitter antenna configuration of radiation source unit at random distribute, transmitter calculates unit module to parameter input radiation fields such as the elevation distance of areal coverage, radar observation visual angles, obtain the distributed data of radiation field, then by to the precise calibration of radiation field distribution, after obtaining at last revising accurately the radiation field distribution data to be used for follow-up imaging processing.
Receiver module: this module is a core with the association process unit.Receive the scatter echo signal by the receiving antenna unit, all scattered information all can be received in the whole receiving antenna beam of unit irradiation area, and the information that receives all is coupled.Traditional imaging system is only utilized the scatter echo signal in imaging process, radiation information is eliminated via modes such as matched filterings the effect of target, so radiation field information quilt " assimilation " in the imaging refutation process, constructed space-time bidimensional radiation field at random among the present invention, formed uncorrelated radiation field in beam coverage area.The scatter echo signal that difference is received constantly carries out the association process unit with the radiation field information of corresponding radiation field calculation unit gained, again by the information reorganization, thus output high-resolution inversion image.
As embodiments of the invention, the mode of operation setting of system can for:
According to the difference of radar observation visual angle γ, system is provided with looks, looks side ways just down and look side ways three kinds of mode of operations greatly.The pattern of looking just down realizes near the regional high-resolution staring imaging the subpoint; Strabismus mode has been broken through and has been looked fixing, the inflexible shortcoming in radar observation zone under the pattern just down, at any time the arbitrary region in the bilateral strabismus angular coverage before and after the platform is surveyed; Thereby can to rear area target imaging once more, have the maneuverability of height to the imaging in advance of the place ahead target.The multiple mode of operation of platform imaging system has strengthened the disguise of carrier aircraft, has improved the viability of carrier aircraft largely, has also brought very big dirigibility simultaneously, can in time adjust observation mode zones of different is carried out imaging.According to the size of angle of squint, be divided into strabismus mode and big strabismus mode.Strabismus mode is used for the high resolving power staring imaging of remote zone realization after geometry correction; Big strabismus mode is used for the high resolving power staring imaging of overlength distance zone realization behind geometry correction and radiometric calibration.
Being set as follows of concrete various mode of operations:
(1) looks mode of operation just down
The pattern of looking just down realizes near the regional high-resolution staring imaging the subpoint, utilizes system body mentioned above to constitute the radar high-resolution imaging function that can finish under this mode of operation.By near the zone the subpoint of ground is shone, with radiation source unit at random is the transmitter emission space radiation field at random of core, the radiation field calculation unit module utilization radiation field that aligns down viewed area with platform subpoint range information that transmits is calculated, and carry out the association process unit with scatter echo, realize looking just down the high-resolution imaging under the pattern.If radar observation visual angle angle is less, this moment, geometric distortion was less, need not to carry out geometry correction, and also can work looking under the pattern just down this moment.
For the observation visual angle of looking pattern just down, as shown in Figure 3, b is a n+1 range unit, and a is a n range unit, has:
Because the ground distance that the different distance unit causes expands to δ r.
Then the platform control module should be provided with podium level according to following formula:
As the platform that hovers is apart from floor level H=10km, and transmitted signal bandwidth B is 1GHz, and resolution requirement is δ r≤10m, then looks radar observation visual angle γ under the pattern≤1.72 ° just down.
(2) stravismus mode of operation
Increase to the picture visual angle, system switches to the stravismus mode of operation, 1.72 °＜γ of strabismus mode restriction angle of squint scope≤75 °.This pattern is used for the high resolving power staring imaging of remote zone realization after geometry correction.Under the observation configuration of stravismus, because there is bigger angle in the center of inspection surface (scattering atural object) and radar, so scatter echo signal arrival radar receiver will produce bigger extended distance.Under this mode of operation, on the basis that system body constitutes, promoter spatial domain decomposing module, utilize the space-time bidimensional at random the randomness of radiation field time dimension realize the expansion of echo apart from dimension.The decomposition of sub-spatial domain is equivalent to according to range gate to be cut apart scatter echo, obtains a series of " sub-echoes ".And,, discrete region to be measured being changed into the sub-spatial domain of arc shape according to shown in Figure 4 for each sub-echo, the surface in sub-spatial domain is made of the azimuth dimension vertical with the distance dimension.Utilize sub-spatial domain decomposing module, the sub-spatial domain of overlay area is the different arc of density bunch, closely with respect to the compressed characteristic of remote speech appearance.As shown in Figure 5, in the imaging refutation process, need carry out geometry correction, the sub-spatial domain that obtains rule is divided, and the geometry correction process need is realized by methods such as resampling and interpolation.
To each sub-spatial domain, adopt system body to constitute again, with radiation source unit at random is the transmitter module emission space-time two-dimension radiation field at random of core, with sub-echoed signal and radiation field calculation unit module output carrying out association process unit, just can inverting obtain the scattering strength size of a spatial spreading unit.At last all discrete units are spliced, thereby obtain the regional high resolution radar image of whole stravismus.
Under strabismus mode, high level blocks, atural object rises and falls, and cause folded covered, shadow effect can be ignored, and does not therefore need elevation information, can obtain high-resolution inversion chart picture by above-mentioned expansion of distance dimension and geometry correction.
(3) look side ways mode of operation greatly
Continue to increase the angle of squint, system will switch to big stravismus mode of operation.Big strabismus mode is used for high resolving power staring imaging behind geometry correction and radiometric calibration is carried out in the overlength distance zone.Seemingly also there are geometric distortion in this mode of operation and routine work mode class, need carry out corresponding geometry correction.The increasing of angle of squint has simultaneously brought new problem.It is big that the radar observation visual angle becomes, overlength distance observation imaging meeting produces very strong geometric deformation, as shown in Figure 6 since the fluctuating on ground or mountain peak block that cause folded covered, shadow effect, these distortions can not be corrected, and can cause the acute exacerbation of overlay area two dimensional surface resolution.Folded cover, the inverting data of shade distortion zone do not comprise the target scattering characteristics on the corresponding flat overlay area, therefore should delete these zones from quantitative data analysis.For this reason, need calibration as follows: (1) obtains altitude figures to beam coverage area, obtains the distortion range of corresponding flat overlay area.Can obtain altitude figures by digital elevation figure (DEM) or wave beam interference technique.(2) carry out radiometric calibration, in radiation field calculation unit module,, obtain revised inversion chart picture foldedly covering accordingly, carrying out the association process unit after the radiation field distribution zero setting of shade distortion zone.(3) look like to carry out image registration according to elevation map and revised inversion chart, obtain final inversion chart picture.
For the observation visual angle of big strabismus mode, as shown in Figure 7, the plan range floor level of hovering is H, and earth radius is R.
Then the platform control module should be provided with podium level according to following formula:
As the podium level H that hovers is 10km, and R is an earth radius, then
Below in conjunction with accompanying drawing, the present invention is described in further detail:
This example is an example to look mode of operation just down, uses the described radar system of front summary of the invention, adopts the form of analog simulation, has verified the correctness and the realizability of system of the present invention.Instantiation is as follows.
Concrete imaging scene as shown in Figure 1, the platform that hovers is positioned at Z
0The high-altitude of=20km, center with this platform radar system is that initial point is set up coordinate system, by setting the emission parameter of radiation source unit at random of transmitter module, be equivalent at the bore face by the emission array of forming by 4 emissive sources, its equivalent spatial arrangement is: 4 emissive sources constitute a square, and neighbor distance is D
0=60m.The receiver module coordinate position still is (0,0,0), and the sampling rate of receiver is f
s=10GHz.Imaging plane (areal coverage) is the x-y plane among the figure, and areal coverage is divided into 800 * 800 resolution element, its coordinate range be (0m, 0m)～(D
Obj=3200m, D
Obj=3200m), complete imaging process is as follows:
Transmitter module adopts desirable white Gaussian noise as transmitting, and its time domain waveform and frequency-domain waveform are shown in Fig. 8 (a), Fig. 8 (b).
The radiation field of single emissive source is:
The total radiation field in space is the non-coherent addition of each emissive source in the space radiation field, and therefore total radiation field is:
Radiation style on the areal coverage:
If the target scattering coefficient of areal coverage is
The scattered field that receiver receives can represent that the scattered field that obtains is with following formula
Exist at the receiver receiving position
Situation under, revised radiation field
Following formula is the computing formula of radiation field calculation unit module.
Radiation field distribution figure on the areal coverage that process radiation field calculation unit module draws is as figure (6) (at certain time slice of determining).
The echoed signal that receiver module obtains is
As seen, target information all is coupling in the target information of gained.
Fig. 9 is the areal coverage radiation field distribution figure of certain gaze duration sampling; Figure 10 has provided the areal coverage scattering coefficient and has distributed.
The space-time bidimensional that the unit module of output scattered field echoed signal by the joint receiver module and radiation field calculation at last calculates gained is radiation field at random, change with space diversity at random in time by radiation field at random, according to the space-time bidimensional difference of the statistical dependence characteristic of radiation field at random, association process module in the receiver adopts different processing modes, the target information that feasible script is coupled is separated, and then the information of carrying out is recombinated and acquisition high resolution target information.
In the emulation, two kinds of different radiation signals at random of the radiation source unit at random of transmitter module emission, with the random signal of desirable white noise signal as emission, the image such as Figure 11 (a), 11 (b) that sample and obtain under 2000 times, 5000 times at gaze duration; Utilize the random signal of noise FM signal, image such as Figure 12 (a), Figure 12 (b) of under gaze duration sampling 2000 times, 5000 times, obtaining as emission.
The such scheme that the present invention proposes, can realize prior art can not support be applied to hover the function of staring the high resolution radar imaging over the ground of platform, by the design of multiple mode of operation, can finish staring imaging on a large scale over the ground.Compare with traditional imaging radar system, the such scheme that the present invention proposes has following one or more advantage:
On the platform that hovers, carry this radar system, utilize, improved staring imaging resolution over the ground based on the space-time bidimensional high-resolution microwave staring imaging of radiation field at random;
The scatter echo signal that signal processing module receives difference constantly and corresponding space-time bidimensional radiation field information at random carry out the association process unit, solved tradition stare in the radar in the same wave beam can not high-resolution imaging a difficult problem;
Imaging system has multiple mode of operation, can finish on a large scale, the staring imaging of high-resolution over the ground in the wide visual field.
Those skilled in the art are appreciated that and realize that all or part of step that the foregoing description method is carried is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be a ROM (read-only memory), disk or CD etc.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle 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 (7)
1. the gaze imaging system over the ground of the platform that is used to hover is characterized in that, comprises transmitter module, signal processing module and receiver module,
Described transmitter module, described transmitter module comprises radiation source unit and transmission antenna unit at random, described radiation source unit at random is used for producing and the emission random signal with predetermined observation visual angle, described transmission antenna unit is by the actinal surface field of heterogeneous centrical antenna to external radiation formation stochastic distribution, with forming space-time bidimensional radiation field at random in beam coverage area behind the spatial transmission;
Described signal processing module, link to each other with described transmitter module, the form that transmits, transmitter antenna configuration by radiation source unit at random distributes, transmitter to the elevation distance of areal coverage, observe the visual angle, calculate the described space-time bidimensional distributed data of radiation field at random, by to the described space-time bidimensional precise calibration of radiation field distribution at random, with described space-time bidimensional at random the radiation field distribution data be input to described receiver module;
Receiver module, be used for receiving the scatter echo signal according to the receiving antenna unit of described receiver module, to the described space-time bidimensional of described scatter echo signal and described signal processing module input at random radiation field distribution information carry out association process, output high-resolution inversion image.
2. the gaze imaging system over the ground of the platform that is used to hover as claimed in claim 1 is characterized in that, described radiation source unit at random is used for producing and the emission random signal comprises following any one pattern with predetermined angle of view:
Described radiation source unit at random is to look mode of operation emission random signal just down;
Described radiation source unit at random is with stravismus mode of operation emission random signal;
Described radiation source unit at random is with big stravismus mode of operation emission random signal.
3. the gaze imaging system over the ground of the platform that is used to hover as claimed in claim 2 is characterized in that,
The described mode of operation of looking just down is observation visual angle γ≤1.72 °;
Described stravismus mode of operation is the observation 1.72 °＜γ in visual angle≤75 °;
Described big stravismus mode of operation is the observation 75 °＜γ in visual angle≤86.8 °.
4. the gaze imaging system over the ground of the platform that is used to hover as claimed in claim 2 is characterized in that described receiver module comprises the receiving antenna unit, echo storage and pretreatment unit and association process unit,
Described receiving antenna unit is used to receive the scattered field rec (t) of described beam coverage area,
Wherein, the area of described beam coverage area is s ',
Be total space-time bidimensional radiation field at random, the target scattering coefficient of described beam coverage area is
Described echo storage and pretreatment unit are used to receive the information and the storage of the output of described receiving antenna unit, the described association process of input unit after the pre-service;
Described association process unit is used for the output radiation field information of described receiving antenna unit output echoed signal and radiation field calculation unit module is carried out the association process unit, obtains high resolution target information by the information reorganization again.
5. the gaze imaging system over the ground of the platform that is used to hover as claimed in claim 4 is characterized in that the radiation field of single emissive source is:
Described total space-time bidimensional radiation field at random is:
Wherein, N is the number of radiation source.
6. the gaze imaging system over the ground of the platform that is used to hover as claimed in claim 2 is characterized in that, under the stravismus mode of operation, remote zone is realized comprising high resolving power staring imaging after geometry correction:
At first carry out sub-spatial domain and decompose, be equivalent to according to range gate scatter echo is cut apart, obtain a series of sub-echoes;
To each sub-spatial domain, with radiation source unit at random is the transmitter module emission space-time two-dimension radiation field at random of core, with sub-echoed signal and described signal processing module output carrying out association process unit, inverting obtains the scattering strength size in each sub-spatial domain so successively;
All sub-spatial domains are spliced, obtain the high resolution radar image in whole stravismus zone.
7. the gaze imaging system over the ground of the platform that is used to hover as claimed in claim 2 is characterized in that, under big strabismus mode, high resolving power staring imaging behind geometry correction and radiometric calibration is carried out in the overlength distance zone, comprising:
Beam coverage area is obtained altitude figures, obtain the distortion range of corresponding flat overlay area;
Carry out radiometric calibration, in described signal processing module,, obtain revised inversion chart picture corresponding folded covering, carrying out the association process unit after the radiation field distribution zero setting of shade distortion zone;
Look like to carry out image registration according to elevation map and revised inversion chart, obtain final inversion chart picture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110000522 CN102169179B (en) | 2011-01-04 | 2011-01-04 | Ground staring imaging system for hovering platforms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110000522 CN102169179B (en) | 2011-01-04 | 2011-01-04 | Ground staring imaging system for hovering platforms |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102169179A true CN102169179A (en) | 2011-08-31 |
| CN102169179B CN102169179B (en) | 2013-01-30 |
Family
ID=44490409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110000522 Expired - Fee Related CN102169179B (en) | 2011-01-04 | 2011-01-04 | Ground staring imaging system for hovering platforms |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102169179B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399315A (en) * | 2013-07-13 | 2013-11-20 | 西安电子科技大学 | High-resolution detecting and imaging method for real-aperture phased array radar |
| CN103837873A (en) * | 2014-03-14 | 2014-06-04 | 中国科学技术大学 | Microwave and stare correlated imaging system and method based on floating platform and intensive array antennae |
| CN107422321A (en) * | 2017-07-25 | 2017-12-01 | 中国科学技术大学 | Microwave stares relevance imaging earth observation method |
| CN108181624A (en) * | 2017-12-12 | 2018-06-19 | 西安交通大学 | A kind of Difference Calculation imaging device and method |
| CN108828593B (en) * | 2018-04-26 | 2020-06-02 | 电子科技大学 | Random radiation radar correlation imaging method |
| CN111257871A (en) * | 2020-03-09 | 2020-06-09 | 中国科学技术大学 | Single-antenna radiation source design method for microwave staring correlated imaging |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6996292B1 (en) * | 2002-04-18 | 2006-02-07 | Sandia Corporation | Staring 2-D hadamard transform spectral imager |
| CN101776749A (en) * | 2010-01-14 | 2010-07-14 | 北京理工大学 | Vehicle-mounted staring imaging laser radar synchronous triggering system |
-
2011
- 2011-01-04 CN CN 201110000522 patent/CN102169179B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6996292B1 (en) * | 2002-04-18 | 2006-02-07 | Sandia Corporation | Staring 2-D hadamard transform spectral imager |
| CN101776749A (en) * | 2010-01-14 | 2010-07-14 | 北京理工大学 | Vehicle-mounted staring imaging laser radar synchronous triggering system |
Non-Patent Citations (3)
| Title |
|---|
| 《APMC2005 Proceedings》 20051231 Lan zhao 等 Study on Mechanism of Radiometer Staring Imaging 全文 1-7 , * |
| 《电子与信息学报》 20071031 韩兴斌 等 分布式多通道雷达成像技术 2354-2358 1-7 第29卷, 第10期 * |
| 《红外与激光工程》 20061031 刘兆军 等 面阵凝视型成像空间应用技术 541-545 1-7 第35卷, 第5期 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399315A (en) * | 2013-07-13 | 2013-11-20 | 西安电子科技大学 | High-resolution detecting and imaging method for real-aperture phased array radar |
| CN103399315B (en) * | 2013-07-13 | 2015-06-17 | 西安电子科技大学 | High-resolution detecting and imaging method for real-aperture phased array radar |
| CN103837873A (en) * | 2014-03-14 | 2014-06-04 | 中国科学技术大学 | Microwave and stare correlated imaging system and method based on floating platform and intensive array antennae |
| CN103837873B (en) * | 2014-03-14 | 2016-08-17 | 中国科学技术大学 | A kind of microwave based on floating platform closely spaced array antenna stares relevance imaging system and formation method |
| CN107422321A (en) * | 2017-07-25 | 2017-12-01 | 中国科学技术大学 | Microwave stares relevance imaging earth observation method |
| CN107422321B (en) * | 2017-07-25 | 2020-05-15 | 中国科学技术大学 | Microwave staring associated imaging ground observation method |
| CN108181624A (en) * | 2017-12-12 | 2018-06-19 | 西安交通大学 | A kind of Difference Calculation imaging device and method |
| CN108181624B (en) * | 2017-12-12 | 2020-03-17 | 西安交通大学 | Difference calculation imaging device and method |
| CN108828593B (en) * | 2018-04-26 | 2020-06-02 | 电子科技大学 | Random radiation radar correlation imaging method |
| CN111257871A (en) * | 2020-03-09 | 2020-06-09 | 中国科学技术大学 | Single-antenna radiation source design method for microwave staring correlated imaging |
| CN111257871B (en) * | 2020-03-09 | 2023-06-16 | 中国科学技术大学 | Single-antenna radiation source design method for microwave staring correlated imaging |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102169179B (en) | 2013-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7341526B2 (en) | mmWave and/or microwave imaging systems and methods, including examples of segmented inverse, extended resolution modes and imaging devices; | |
| CN102169179B (en) | Ground staring imaging system for hovering platforms | |
| DE112016000274B4 (en) | System for generating virtual radar signatures | |
| US8040273B2 (en) | Radar for imaging of buildings | |
| US9041587B2 (en) | Apparatus and method for assisting vertical takeoff vehicles | |
| JP7034164B2 (en) | Radar target emulator with switching device for radar target emulator and such switching device | |
| CN107656253B (en) | Electromagnetic vortex synthetic aperture radar echo signal simulation method and device | |
| CN107422321B (en) | Microwave staring associated imaging ground observation method | |
| CN102221697A (en) | Airborne multi-antenna SAR chromatography three dimensional imaging system and imaging method thereof | |
| CN109188434B (en) | SAR system based on frequency modulation continuous wave system and processing method thereof | |
| US20090289833A1 (en) | Sparse array millimeter wave imaging system | |
| CN104267400B (en) | For the microwave signal receive-transmit system of MIMO-SAR imaging, method and imaging system | |
| CN104280735A (en) | MIMO-SAR imaging method and device based on arc-shaped array antenna | |
| CN108008380A (en) | A kind of microwave based on satellites formation stares relevance imaging method and system | |
| KR102420978B1 (en) | System and method for simulation and image quality analysis of sar payload for micro-satellite | |
| CN105891825A (en) | Multiple-input multiple-output array radar staring imaging method based on tensor compression perception | |
| CN107192992B (en) | Radar calibration method, calibrator, radar device and system | |
| CN111103583B (en) | Three-dimensional radio frequency imaging system and method with real-time calibration | |
| CN202735513U (en) | Holographic active microwave imaging device | |
| Laviada et al. | Multistatic millimeter-wave imaging by multiview portable camera | |
| US9348022B1 (en) | Identifying obstacles in a landing zone | |
| CN102798858B (en) | Holographic active microwave imaging method | |
| CN106707253A (en) | Networking radar and networking jammer countermeasure test device and method in test room | |
| CN110118956B (en) | Bistatic SAR anti-interference performance evaluation method for immune ground jammer area | |
| CN106291476A (en) | The Radar Clutter acquisition methods of airborne three-dimensional isomery battle array |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20210104 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |