System for evaluating disturbance rejection rate parasitical loop of strap down infrared seeker

Abstract

The invention discloses a system for evaluating the disturbance rejection rate parasitical loop of a strap down infrared seeker. The system comprises a target simulator, a three-axis rotary table, the seeker and an emulation computer, wherein the target simulator simulates the movement relation of a target; the strap down infrared seeker detects the infrared signal source of the target simulator, and outputs a missile-target LOS (Line of Sight) rate obtained after decoupling filtering to the emulation computer, the emulation computer calculates the attitude and position information of a missile according to a practical kinetic model of the missile and transmits the attitude angle of a missile body to the three-axis rotary table to simulate the movement of the missile body; the emulation computer figures out a theoretical missile-target LOS rate and transmits the theoretical missile-target LOS rate to the target simulator to simulate the movement of the missile-target to form an entire closed-loop testing system. In the whole process, the emulation computer stores test data for final disturbance rejection rate calculation. The system eliminates the problem of singular point in the traditional disturbance rejection rate testing method, and enables that the disturbance rejection rate test is more accurate and a testing system is closer to the practical combat mode of the missile.

Description

technical field [0001] The invention relates to the technical field of missile guidance, in particular to a strapdown infrared seeker isolation parasitic loop evaluation system. Background technique [0002] With the development and progress of science and technology, in the current missile technology, the strapdown infrared seeker cancels the mechanical frame structure, directly connects with the missile body, increases the reliability of the system, and saves the cost greatly by eliminating the inertial stabilization platform . Compared with the traditional seeker, the line-of-sight angular velocity of the strapdown seeker is not limited, which eliminates the cross-coupling of the pitch / yaw channel due to friction, and is small in size and low in price, which meets the requirements of modern precision-guided weapons on the seeker new requirements. [0003] In the strapdown system, the projectile motion information is completely coupled into the seeker output signal. In o...

AI Technical Summary

Problems solved by technology

[0003] In the strapdown system, the projectile motion information is completely coupled into the seeker output signal. In order to isolate the projectile motion, the usual method is to decouple the projectile attitude based on the mathematical platform. However, the scale coefficient error, inertial device dynamics The existence of the science and detector delay will affect the decoupling accuracy of the projectile, and then cause the isolation parasitic loop, resulting in the stability of the isolation parasitic loop, and will also affect the performance of the guidance system, thereby affecting the guidance accuracy of the missile, so the strapdown The seeker has new requirements for isolation, and an effective method to evaluate the isolation parasitic loop of the strapdown seeker is particularly important

[0004] The traditional open-loop isolation test method, such as the seeker isolation test system disclosed in the Chinese patent application No. 201110415516.9, can evaluate the isolation level of the platform seeker to a certain extent, but the strapdown seeker The isolation degree of the missile is closely related to the attitude movement of the missile. If a single sinusoidal movement is used to simulate the attitude of the missile body, the isolation degree of the strapdown infrared seeker cannot be accurately evaluated.

At the same time, since the three-axis turntable simulates the swing of the projectile attitude according to the sine or cosine, when the angular velocity of the projectile attitude crosses zero, a singular point will be generated, and even when it is close to zero, the isolation level will be enlarged, making the test data inaccurate and unable to be effective. Engineering application of guidance seeker

Moreover, due to the cancellation of the mechanical frame structure of the strapdown seeker, the isolation problem is more serious, and the traditional test isolation method is no longer applicable.

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