Space target visibility region detection method based on hierarchical target function
An objective function and target technology, which is applied in the field of spatial target visibility area detection based on hierarchical objective functions, can solve the problems of small step size selection, complex detection airspace, and the calculation speed is difficult to meet the requirements of rapid evaluation, so as to avoid repeated calculation, The effect of improving analysis efficiency and speeding up visibility operations
Active Publication Date: 2020-06-19
NO 63921 UNIT OF PLA
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[0003] The actual detection airspace of most equipment is complex, and there are many parameter constraints. Typical constraints include: distance, orbital altitude, pitch angle, azimuth angle, search screen, rectangular field of view, target signal-to-noise ratio, etc., which will affect the visibility prediction. At the same time, the more constraints there are, the slower the calculation speed is, and it is difficult to meet the timeliness requirements of the evaluation.
The traditional point-by-point prediction comparison of target detection parameters, and then the dichotomy method to find the regional boundary, although the principle is simple, but for the multi-condition constraint calculation of a large number of targets, the step size selection must be small, and the calculation speed is basically difficult to meet the requirements of rapid evaluation
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[0057] Take the calculation of the distance constraint first and then the elevation angle constraint as an example to illustrate it. Assuming a ground-based radar, the radar front is vertical to the zenith, the main visibility constraints are Range≤6000Km within 7 days, and the elevation angle Elevator≥30°. First, through the coordinate rotation matrix R from the inertial system to the ground-fixed coordinate system ECI→ECF Convert the target position vector r(t) of the target at any time t into the ground coordinate system vector, and subtract the station ground-fixed coordinate system vector R to obtain the observation vector:
[0058] [x(t),y(t),z(t)] T =R ECI→ECF ×r(t)-R (5)
[0059] Among them, x(t), y(t), z(t) represent the three-dimensional observation vector at time t, [·] T Represents the matrix transpose. According to the above relationship, the objective function under the distance constraint is first established according to formula (3):
[0060]
[0061] ...
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The invention discloses a space target visibility region detection method based on a target function, belongs to the technical field of space target detection, and can perform visibility region detection under multiple types of constraint conditions. The method comprises the following steps: selecting any target according to to-be-analyzed time and more than two target visibility boundary conditions, and establishing a target function for each target visibility boundary condition; analyzing the shortest monotonous interval of each target function, and sorting the target functions according tothe shortest monotonous interval from long to short to obtain a hierarchical solving sequence; and sequentially selecting the current target functions according to the hierarchical solving sequence. And solving all zero points of the current target function, and for the adjacent zero points, if the target function value of the middle moment A is located in the target visibility boundary and is notequal to the target visibility boundary value, taking the adjacent zero points as the visibility region of the current target function; and combining the visibility regions of all the target functions to form a visibility detection time period.
Description
technical field [0001] The invention relates to the technical field of space target detection, in particular to a method for detecting a space target visibility region based on a hierarchical objective function. Background technique [0002] Wide-area space target detection equipment is the basis to support the improvement of space target surveillance capabilities. In all stages of equipment demonstration, design, simulation, development, testing, and evaluation, it is necessary to use the target orbit and size for the visibility of wide-area space surveillance equipment. Analysis, accurate prediction of measurement parameters such as the position, speed, and signal-to-noise ratio of the target relative to the device at the time of detection, providing a reference for comparison and analysis of detection data. Therefore, it is very important for wide-area space surveillance equipment to detect and calculate the visibility of space targets. On the one hand, it is necessary to...
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Login to View More IPC IPC(8): G06F30/20G06F17/11G05D1/08
CPCG06F17/11
Inventor 黄剑张兵段美亚李朋远路现立
Owner NO 63921 UNIT OF PLA