An Analytical Solution Method for Hypersonic Smooth Glide Trajectory under Rotating Earth

A gliding ballistic and hypersonic technology, applied in the field of aerospace technology and weapons, can solve the problems of tracking error, low precision, difficult to meet precise guidance, analysis and correction, and achieve small calculation, high precision and strong universality Effect

Active Publication Date: 2022-04-01
BEIHANG UNIV
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Problems solved by technology

However, due to neglect of the earth's rotation and the influence of the earth's curvature on the heading angle, most of the analytical solutions have low precision in the background of the rotating earth, and there are tracking errors, which are difficult to meet the requirements of precise guidance, analysis and correction, and have certain limitations.

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  • An Analytical Solution Method for Hypersonic Smooth Glide Trajectory under Rotating Earth
  • An Analytical Solution Method for Hypersonic Smooth Glide Trajectory under Rotating Earth
  • An Analytical Solution Method for Hypersonic Smooth Glide Trajectory under Rotating Earth

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Embodiment example

[0549] In order to verify the accuracy of the algorithm, the CAV-H is used as the reentry vehicle model to carry out simulations under seven different target states. Simulations are performed in seven different target states. Reentry initial state is h 0 = 60km, V 0 =7200m / s, λ 0 = 0°, θ 0 = 45°, γ 0 = 0°. ψ 0 Take the value according to the target direction. Ballistic damping control technology is used to suppress ballistic oscillation, where the ballistic damping feedback item coefficient K γ =5. terminal bound to E TAEM =-5.5×10 7 J / kg. Simulation results such as Figure 5-Figure 6 .

[0550] Table 1 Terminal state quantity

[0551]

[0552]

[0553]

[0554] Figure 5 In , the trajectory of the eastward flight is curved due to the influence of the Coriolis force. From Figure 5 and Figure 6 It can be seen from the simulation results that the accuracy of the new analytical solution is also very high in the general case where the lift-to-drag rati...

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Abstract

The present invention is an analytical solution method for a hypersonic smooth gliding trajectory under a rotating earth, which is characterized in that it comprises the following steps: step 1: establishing an auxiliary geocentric rotation reference system; step 2: establishing a reentry based on generalized latitude and longitude coordinates Kinetic model; Step 3: Reentry analytical solution derivation method. The invention has the advantage of catering to the characteristic that the longitudinal distance of the hypersonic smooth gliding trajectory is much larger than the horizontal distance, and is more conducive to linear processing. A simplified dynamic model about longitudinal course, transverse course and generalized heading angle with energy as independent variable is obtained, which is beneficial for further decoupling processing. It has the characteristics of high precision, small amount of calculation, and strong universality, which is beneficial to be applied to various aspects such as ballistic planning, predictive guidance, and control design.

Description

technical field [0001] The invention provides an analytical solution method for a hypersonic smooth gliding trajectory under a rotating earth, and belongs to the fields of aerospace technology and weapon technology Background technique [0002] Hypersonic glide vehicle has the advantages of long range, strong defense penetration capability and great damage power, and has become a research hotspot in various countries. The hypersonic gliding vehicle has a very unique ballistic trajectory, most of the time it flies without power in the adjacent space at an altitude of 20km-100km, and its flight speed and altitude are between conventional fixed-wing aircraft and spacecraft. [0003] The research on the analytical solution of the reentry trajectory has important theoretical significance and application value for exploring the reentry flight mechanism, reentry guidance design, and aircraft performance evaluation. The high-precision analytical solution of reentry trajectory is ve...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F111/10G06F119/14
CPCG06F30/15G06F2111/10G06F2119/14
Inventor 陈万春张晚晴余文斌
Owner BEIHANG UNIV
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