A Stochastic Fast Smooth Second-Order Sliding Mode Terminal Guidance Method

A second-order sliding mode and terminal guidance technology, applied in guidance methods, weapon accessories, offensive equipment, etc., can solve problems such as ignoring random characteristics, achieve the effect of suppressing large chattering, easy to implement, and wide application prospects

Active Publication Date: 2018-08-31
方洋旺
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method puts a lot of restrictions on the maneuverability of the target, treats it as a differentiable bounded disturbance and ignores its random characteristics

Method used

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  • A Stochastic Fast Smooth Second-Order Sliding Mode Terminal Guidance Method
  • A Stochastic Fast Smooth Second-Order Sliding Mode Terminal Guidance Method
  • A Stochastic Fast Smooth Second-Order Sliding Mode Terminal Guidance Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] The scenario where the missile intercepts the target in the longitudinal plane is selected for simulation. The stochastic fast smooth second-order sliding mode terminal guidance law (SFSS_SMG) simulation results are compared with the classic extended proportional guidance (APN), ordinary sliding mode variable structure guidance (SMG) and deterministic smooth second-order sliding mode terminal guidance law (SS_SMG )comparing. Simulation conditions: The initial position of the missile is (0,0)km, the initial velocity is 3Ma, the maximum overload is 30g, and the initial velocity direction is 0°; the local sound velocity is obtained by interpolation and fitting based on temperature and altitude. The target maneuver is to use the maximum n t The normal acceleration of the overload is used for maneuvering, and the direction and size of the maneuvering are randomly changed every 2s. The performance of the guidance law is simulated and compared in two cases:

[0145] 1. In t...

Embodiment 2

[0154] After 100 Monte-Carlo simulations in the head-on situation, get n t Table 2 shows the simulation comparison of the miss amount of the four guidance laws when different values ​​are taken.

[0155] Table 2 Comparison of the amount of misses in the head-on situation (meters)

[0156]

[0157] From the results in Table 2 and Table 1, it can be seen that the amount of misses in the head-on situation is generally larger than that in the tail-chasing situation. This is because in the head-on situation, the relationship between projectiles and targets changes faster, especially when the projectile-target distance becomes smaller. , a faster relative motion relationship will lead to a larger amount of miss. The results show that the performance of SFSS_SMG in the head-on situation is the best among the four guidance laws.

[0158] image 3 is the convergence of the sliding mode variables of each guidance law in the head-on situation. From image 3 It can be seen from th...

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Abstract

The invention relates to the technical field of weapon systems and utilization engineering, and discloses a random quick smooth second-order sliding mode terminal guidance method. The method comprises the steps that firstly, a random uncertain guidance model is built; secondly, a random quick smooth second-order sliding mode control law is made; and thirdly, the random quick smooth second-order sliding mode control law is applied to the random uncertain guidance model to obtain a finite-time convergence random quick smooth second-order sliding mode guidance law. The method has the beneficial effects that the sliding mode variable convergence speed of the provided random quick smooth second-order sliding mode guidance law is obviously superior to that of a non-finite time guidance law; random maneuvering of a target is considered, and compared with a certain quick smooth second-order sliding mode method, the miss distance is smaller; the provided guidance law can restrain great buffeting of the control quantity of the guidance middle segment, and therefore the control quantity is easier to achieve, and the line-of-sight rate is more stable; the guidance law has the high anti-jamming capacity and capacity of dealing with random maneuvering of the target; and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the field of weapon system and application engineering technology, in particular to a random fast smooth second-order sliding mode terminal guidance method. Background technique [0002] The process of missile interception will be affected by detection error, external interference, etc., coupled with the randomness of target maneuvering, the guidance system is actually a random and uncertain system. On the other hand, with the continuous development of targets, especially the emergence of hypersonic targets, the relative movement of projectiles and targets is very fast during the terminal guidance process of intercepting or striking targets. Moreover, in order to achieve the purpose of destroying the target, the missile is required to have higher precision, that is, the kinetic energy killing method (Hit-to-Kill), which is to use the huge kinetic energy of the high-speed and high-quality missile to hit the target to achieve the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F41G3/00
CPCF41G3/00
Inventor 方洋旺杨鹏飞伍有利张丹旭彭维仕
Owner 方洋旺
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