CN106202801A - Target travel hangover emulation mode in a kind of space-based optical space fragment monitoring picture - Google Patents

Abstract

The invention discloses target travel hangover emulation mode in a kind of space-based optical space fragment monitoring picture, comprise the steps: that (1) obtains space motion fragment move distance pixel count in imaging detector image planes within the given time of integration；(2) according to move distance pixel count, an area image is set up；Fragment motion smear is the pixel of process on this area image, is the pixel that this fragment motion smear is resident in time of integration Δ T；(3) using each resident on imaging surface for fragment hangover pixel as a sub-goal, by each sub-goal R_iA diffusion simulations is carried out according to Gauss model；(4) region of energy supposition between the diffusion of adjacent sub-goal Gauss point is added, simulates the hangover of motion fragment；In the space-based optical space fragment monitoring picture that the present invention provides, target travel hangover emulation mode, possesses the advantage that energy phantom is accurate, do not have breakpoint under fragment targeted cache moving condition.

Description

Target travel hangover emulation mode in a kind of space-based optical space fragment monitoring picture

Technical field

The invention belongs to space-based optical imagery simulation technical field, more particularly, to a kind of space-based optical space fragment Target travel hangover emulation mode in monitoring picture.

Background technology

Space-based optical space fragment monitoring picture refers to the space image in the shooting of employing sky, exoatmosphere based optical systems, Owing to imaging process is not affected by air, cloud layer scattering and atmospheric attenuation, there is no the system that ground based observa tion platform geographical position is disposed About, it is one of Main Means obtaining space motion patch information.In recent years, many space junk optical imaging probe also lands Continue and succeed in developing and come into operation, such as: the space-based visible sensor (SBV) of the U.S., European Space Situation Awareness System (ESSAS), Canadian terrestrial space surveillance satellite (NESS).Due to space motion fragment anti-mainly by the sun in space Penetrating and just can be captured by a camera, and shooting distance is farther out, so energy is faint, space motion fragment is on optical system imaging face The form of expression is point target.In the space-based optical imaging system design phase, the design of all of information processing algorithm is with checking all The image of untrue shooting, as Data Source, can only be verified by emulating image.Therefore, based on space-based optical imagery The space motion fragment monitoring picture emulation technology of system spatial visualization sensor design with manufacture in occupy the heaviest The status wanted.

The imaging process of space junk optical imagery is by optical system parameter, image device noise, time of exposure, celestial sphere Coordinate is to the impact of the factors such as the conversion of sensor coordinates, target travel angular velocity.Therefore, space junk optical imagery emulation skill Art is faced with an a lot of difficult problem.Existing research concentrates on star sensor star chart emulation technology, but the star motions in star sensor Angular velocity is relatively low, is not particularly suited for the space junk hangover emulation of high-speed motion, can produce breakpoint and form mistake hangover； The method solving simulation space high-speed motion fragment point target monitoring picture problem is less, for U.S.'s space-based visible sensor (SBV) tail energy phantom that Space Target Surveillance image simulation method is proposed inaccuracy；Some are for static The emulation mode of extraterrestrial target, do not consider the smearing effects that target travel causes.

Summary of the invention

For disadvantages described above or the Improvement requirement of prior art, the invention provides a kind of space-based optical space fragment and monitor In image, target travel hangover emulation mode, its object is to emulate the smearing of space high-speed motion fragment.

For achieving the above object, according to one aspect of the present invention, it is provided that a kind of space-based optical space fragment watch circle In Xiang, target travel hangover emulation mode, comprises the steps:

(1) space motion fragment move distance picture in imaging detector image planes within the given time of integration is obtained Element；

(2) according to move distance pixel, (a M is set up_X,M_Y) area image of pixel size；Fragment motion smear is at this The pixel of process on area image, is the pixel that this fragment motion smear is resident in time of integration Δ T；

Wherein, Δ T=T/N, N refer to fragment motion smear number of pixels of process on area image；

(3) fragment each resident on imaging surface pixel of hangover is regarded as a sub-goal, by each sub-goal R_i A diffusion simulations is carried out according to Gauss model；

(4) region of energy supposition between the diffusion of adjacent sub-goal Gauss point is added, simulates the hangover of motion fragment.

Preferably, target travel hangover emulation mode in above-mentioned space-based optical space fragment monitoring picture, space junk exists Move distance pixel count in image planes is respectively M_X、M_Y；M_X=V_X·T/P；

M_Y=V_Y·T/P；

Wherein, T is the given time of integration, V_XRefer to that fragment angular velocity of satellite motion V (degrees second) on imaging surface is in X side Angular velocity component upwards, V_y(degrees second) refers to that fragment angular velocity of satellite motion V on imaging surface angular velocity in the Y direction divides Amount.

Preferably, target travel hangover emulation mode in above-mentioned space-based optical space fragment monitoring picture, its step (3) has Body is, by each sub-goal R_iA diffusion simulations is carried out according to following Gauss model

$R_i(x,y)=\frac{\mathrm{\Φ}}{\sqrt{2\mathrm{\π}}\mathrm{\σ}}\exp (-\frac{{(x-x_0)}^2+{(y-y_0)}^2}{2{\mathrm{\σ}}^2});$

Wherein, σ refers to the size of Gauss disc of confusion size, Φ refer to the Δ T time of integration in space junk at camera imaging Energy on face, i=1,2,3..., N.

In general, by the contemplated above technical scheme of the present invention compared with prior art, it is possible to show under acquirement Benefit effect:

In existing space motion fragment optical imagery emulation technology, lack effective space motion fragment smearing and imitate True method；Target travel hangover emulation mode in the space-based optical space fragment monitoring picture that the present invention provides, possesses energy and imitates The advantage that true mode is accurate, do not have breakpoint under fragment targeted cache moving condition；Use the sky that this emulation mode obtains Space motion fragment smearing in base optical imagery is applicable to the information processing of supporting and space visible sensor.

Accompanying drawing explanation

Fig. 1 is the target travel region of streaking image schematic diagram in the embodiment of the present invention；

Fig. 2 is the continuous Gaussian disc of confusion schematic diagram in the embodiment of the present invention；

Fig. 3 is the energy envelope area schematic in the embodiment of the present invention；

Fig. 4 is the extraterrestrial target hangover emulation schematic diagram of the high angular velocity of satellite motion in the embodiment of the present invention；

Fig. 5 is the simulation of space debris image schematic diagram in the embodiment of the present invention.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and It is not used in the restriction present invention.If additionally, technical characteristic involved in each embodiment of invention described below The conflict of not constituting each other just can be mutually combined.

Target travel hangover emulation mode in the space-based optical space fragment monitoring picture that embodiment provides, including walking as follows Rapid:

(1) high-speed motion fragment smearing area image is built；Build the target travel region of streaking image obtained such as Shown in Fig. 1, the row and column number of area image represent respectively high-speed motion fragment target space-based optical system imaging face X-axis with Motion pixel number in Y direction；Each lattice represents a pixel, and the square of black represents extraterrestrial target at this picture Element position resides a period of time Δ t, thinks that extraterrestrial target point is a static target in this Δ t time period；

(2) continuous Gaussian disc of confusion is built；Build the continuous Gaussian disc of confusion obtained as in figure 2 it is shown, wherein, each black The gross energy Φ of the static sub-goal that square represents is the electronics that this target produces in Δ t in the time of integration on resident pixel Number；

(3) energy of cumulative Gauss disc of confusion overlapping region；

As a example by Fig. 2, label is respectively pixel 1. and 2., the Gaussian Energy diffusion zone between the two pixel is sent out Give birth to overlap；Owing to space junk itself is the most luminous, the reflection fully relying on sunlight can be visited by sky based optical systems Measure, therefore can simulate according to the punctate opacity of the cornea model under the conditions of ideal image；

Fig. 3 be comprise point target 1. with point target exemplary plot region M 2., the most 1. with the most respectively with 3 × 3 pixel sizes Gauss punctate opacity of the cornea model representation, and ensure that their central energy accounts for more than the 60% of fixed star point gross energy, they are at administrative division map As the position on M is respectively M (x_i, y_j), i=1,2,3j=4,5,6 and M (x_m,y_l), m=2,3,4l=3,4,5；

Point target 1. and point target 2. between exist four pixels energy envelope region, lay respectively at M (2,5), M (3, 5), at four pixels of M (2,4), M (3,4), by point target, 1. energy with point target pixel overlapping region 2. all adds up After, it is assigned to M'(2 as new pixel energy, 5), M'(3,5), M'(2,4), M'(3,4), it is thus achieved that the picture of final overlapping region Unit's energy；

(4) the Gauss disc of confusion region of the adjacent all energy envelope shown in Fig. 2 is carried out energy accumulation, obtain Fig. 4 institute Simulation objectives smearing after the linear fit shown, moving target in Fig. 4 supposes to be initially positioned in the center of image, and to The lower right corner moves rapidly, and final one hangover of formation on image.

The smearing that the emulation mode using embodiment to provide obtains has taken into full account the energy under the conditions of ideal image Distribution, and do not affected by target travel angular velocity in simulation process, breakpoint will not be produced and simulate mistake hangover；Will The high-speed moving object hangover that emulation obtains is put in the star background analogous diagram that with the addition of imaging noise, obtains such as Fig. 5 institute The space junk optical simulation image shown, the emulating image in Fig. 5 takes into full account the influence factor of space-based optical table imaging, bag Include imaging noise, unsaturation fixed star punctate opacity of the cornea, the hangover that the space junk of saturated fixed star punctate opacity of the cornea and rapid movement produces, substantially connect Nearly real optical imagery, it is possible to the research for space junk detection method provides data supporting.

As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention, not in order to Limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, all should comprise Within protection scope of the present invention.

Claims (3)

1. target travel hangover emulation mode in a space-based optical space fragment monitoring picture, it is characterised in that include as follows Step:

(1) space motion fragment move distance pixel count in imaging detector image planes within the given time of integration is obtained；

(2) according to move distance pixel count, (a M is set up_X,M_Y) area image of pixel size；Fragment motion smear is in this district The pixel of process on area image, is the pixel that this fragment motion smear is resident in time of integration Δ T；

Wherein, Δ T=T/N, N refer to fragment motion smear number of pixels of process on area image；

(3) using each resident on imaging surface for fragment hangover pixel as a sub-goal, by each sub-goal R_iAccording to height This model carries out a diffusion simulations；

(4) region of energy supposition between the diffusion of adjacent sub-goal Gauss point is added, simulates the hangover of motion fragment.

2. target travel hangover emulation mode, its feature in space-based optical space fragment monitoring picture as claimed in claim 1 Being, described space junk move distance pixel count in image planes is respectively M_X、M_Y；M_X=V_X·T/P；M_Y=V_Y·T/P；

Wherein, T is the given time of integration, V_XRefer to that fragment angular velocity of satellite motion on imaging surface angular velocity in the X direction divides Amount, V_yRefer to fragment angular velocity of satellite motion on imaging surface angular velocity component in the Y direction.

3. target travel hangover emulation mode, its feature in space-based optical space fragment monitoring picture as claimed in claim 2 Being, described step (3) is specifically, by each sub-goal R_iA diffusion simulations is carried out according to following Gauss model so that

Wherein, σ refers to the size of Gauss disc of confusion size, Φ refer to the Δ T time of integration in space junk on camera imaging face Energy, i=1,2,3..., N.