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Sparse measurement method for complete spatial baseline VLBI system

A space baseline and measurement method technology, applied in the aerospace field, can solve the problems of measurement accuracy, atmospheric attenuation and time delay, and achieve the effect of reducing the amount of collected data, reducing operating costs, and reducing construction costs

Active Publication Date: 2019-02-01
NO 63921 UNIT OF PLA
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Problems solved by technology

[0004] However, the current space VLBI is based on the measurement mode of the space-ground baseline. The system only includes a space VLBI station, and its observation is based on the space-ground baseline composed of the space-borne antenna and the ground antenna. The measurement of this incomplete space baseline Accuracy is still affected by Earth's atmospheric attenuation and time delay

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  • Sparse measurement method for complete spatial baseline VLBI system
  • Sparse measurement method for complete spatial baseline VLBI system
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Embodiment Construction

[0027] The present invention proposes a spacecraft orbit sparse measurement method based on the space baseline VLBI system, which includes two steps of system measurement modeling and sparse measurement. The specific implementation of the invention will be described in detail below.

[0028] Step 1. Complete spatial baseline VLBI system measurement modeling

[0029] The steps refer to establishing a mathematical model between spacecraft orbit and interferometric information based on the principle of VLBI interferometry and the law of orbital motion of the space VLBI platform. The measurement modeling here is after the signal correlation processing, so the key is to analyze the functional relationship between the VLBI delay and the space position of the spacecraft. figure 1 The schematic diagram of the measurement geometry of the complete spatial baseline VLBI system is given, and the strategy of step-by-step refinement is adopted in the modeling. The modeling process can be d...

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Abstract

The invention relates to the aerospace field and is a sparse measurement method for a complete spatial baseline VLBI system. The purpose is to reduce the burden of data acquisition, storage and communication when the spatial VLBI system is used for spacecraft orbit measurement by the sparse measurement of VLBI signals. The method is as follows: according to the VLBI measurement principle, constructing the measurement model of the complete spatial baseline VLBI system, and giving a delay calculation method; further according to the sparse prior characteristics of the spacecraft orbital parameters, designing the sparse measurement mode of the spatial VLBI navigation signals, and establishing the sparse sampling and reconstruction method of navigation measurement signals. This method can significantly reduce the scale of VLBI measurement data, and provide reference for the constellation configuration design and data processing of the complete spatial baseline VLBI system.

Description

technical field [0001] The invention relates to the field of aerospace technology, and relates to a space vehicle orbit sparse measurement method for a space VLBI system. Background technique [0002] Precise and reliable orbit determination results are the basis for ensuring the execution of spacecraft missions, and are also the key content of space science applications. With the expansion of the scope of spacecraft activities, especially the needs of deep space exploration missions, the traditional ground-based observation systems that target earth satellite measurement and control are widely used in ranging and speed measurement systems. Due to the sensitivity of the single radial constraint to the flight distance, It is becoming more and more difficult to complete the measurement and control tasks of deep space spacecraft alone. [0003] Very Long Baseline Interferometry (VLBI) obtains the distance difference and its rate of change from the spacecraft to the two baselin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/06
CPCG01S5/06
Inventor 刘也曹建峰刘磊陈略胡松杰
Owner NO 63921 UNIT OF PLA
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