A Fusion Method of External Measurement Data of Rocket Sled Test

Abstract

The invention discloses a rocket sled test exterior data fusion method. The rocket sled test exterior data fusion method has high measurement accuracy of a radar system, high positional accuracy of a shadow shield system, and positioning and speed measurement accuracy of a differential GPS system, solves the problem of water brake section data loss, realizes better integrity of exterior data, realizes whole-course data coverage of a rocket sled test, realizes data fusion, realizes time synchronization of the radar system, the shadow shield system and the differential GPS system, and can produce data having the highest accuracy in the section. Compared with the existing error separation or function judgment method adopting a single exterior measurement technology, the rocket sled test exterior data fusion method provides more data points, solves the problem of the existing error separation method adopting the single exterior measurement error separation technology, and realizes more accurate precision analysis. The rocket sled test exterior data fusion method provides basis for higher-order term separation of an inertial measuring unit error model.

Description

technical field [0001] The invention relates to a method for fusing external measurement data of a rocket sled test, in particular to a method for fusing external measurement data of a rocket sled test based on an inertial measurement device, and belongs to the technical field of aerospace testing. Background technique [0002] The rocket sled is a retrievable test method that uses a rocket engine as power and runs along a specially constructed track. The previous rocket sled speed measurement method used the old-fashioned target breaking trigger method, that is, on the side of the rocket sled, a start target and a stop target were arranged at every other distance, and the sled body touched the start target and the stop target were recorded by the sled recording equipment. The time when the target is stopped, and then the speed of the sled body is known, and the position information of the sled body is obtained according to the position of the target, but because this method...

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Problems solved by technology

The differential GPS system provides navigation data from navigation satellites in the sky. Since the receiving antenna is installed on the top of the skid and is not affected by the environment, it can complete positioning, speed measurement and other measurement functions, making up for the data loss in the water brake section. However, due to technical limitations , in the large overload section of the rocket sled test, its positioning and speed measurement functions failed

[0006] Previous accuracy tests and analysis methods used a single external measurement method for error separation, such as using only radar data for error separation or only using shading plate data for error separation. The result is that the evaluation of the rocket sled test and the The analysis is not comprehensive enough. The radar is used for evaluation, and the speed measurement accuracy in the low-speed area is not high, so the quality of the evaluation is also poor. However, the evaluation using the visor can only evaluate the data of the acceleration section and the taxiing section, and cannot perform the water braking section. The accuracy analysis of the entire process limits the accuracy analysis of the rocket sled test and restricts the progress of rocket sled error separation. Therefore, it is urgent to find a method that can achieve full coverage of the rocket sled test and provide accurate external test system data. , providing a guarantee for the separation of higher-order terms in the IMU error model

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