Ground test system and method targeting to space application isomerism IMU initial alignment

Abstract

The invention provides a ground test system and a ground test method targeting to space application isomerism IMU initial alignment. A plurality of sets of isomerism IMUs with different systems are simultaneously mounted on a three-axis rotary table; the rotary table is driven to realize a maneuvering process of an aircraft where the IMUs are mounted; and an inertia posture of the aircraft is calculated by a remote terminal through using postures, relative to an east, north and up geographic coordinate system, of a rotary table frame angle and the rotary table, and a posture, relative to an instant solidification inertia system, of the east, north and up geographic coordinate system. After a GNC controller is subjected to time calibration, the inertia posture is sent to the GNC controller in real time. Output data of the IMUs are collected by the GNC data; meanwhile, inertia posture data are obtained; and an on-planet alignment procedure is operated to carry out alignment calculation so that the data obtained by the GNC controller are consistent with an actual on-orbit flying process. An external optical collimation calibration subsystem is used for obtaining an alignment parameter real value and an alignment result of an on-planet system is estimated. The reality of simulating an alignment process is high, ground tests of a plurality of alignment methods can be adapted, and the project is easy to realize.

Description

technical field [0001] The invention relates to a ground test system and method for initial alignment of space-oriented heterogeneous IMUs, belonging to the technical field of space inertial navigation. Background technique [0002] Space vehicles generally have a strapdown inertial navigation system. In order to ensure the reliability of the system, a combination of heterogeneous IMUs of different systems is usually used. With the development of space vehicles, the number of lightweight structures is increasing, which brings the problem of large installation deformation. At the same time The mission has higher and higher requirements for navigation accuracy, which greatly increases the complexity of the initial alignment in the GNC system and poses new challenges to the ground verification of the alignment navigation system. [0003] Because the parameters of the IMU have repeated power-on errors, the performance differences of IMUs of different systems and different config...

AI Technical Summary

Problems solved by technology

Traditional mathematical simulation tests are difficult to accurately simulate and verify the alignment process. A ground test verification system and method that can not only realize the simulation of traditional alignment methods, but also realize the new multi-parameter alignment algorithm has become an urgent problem to be solved.

[0004] The traditional alignment method is simple to implement, and usually can be verified only by mathematical simulation. When it comes to the alignment method of heterogeneous IMUs with different systems in complex situations such as unknown installation deformation, due to the complexity of the system, the mathematical simulation test cannot be accurately simulated.

The problems that need to be solved in the ground verification system are: new test object, complex object process, high test sequence requirements, many test tasks, and high reliability evaluation of test results

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