Interference time measurement and distance measurement method

Abstract

The invention provides an interference time measurement and distance measurement method that has the following steps: measuring antenna phase center coordinates of a ground station; setting the included angle between a connecting line vector of the two satellites and a connecting line direction vector of the ground station and the satellites as alpha 1; setting the included angles between the phase centers of the ground station antennas and the connecting line direction of the phase centers of the two satellite antennas as alpha 2, obtaining initial satellite orbit information of the two satellites by converting the number of double orbits of the satellites or installing receivers on the ground, and calculating included angles alpha 1 and alpha 2; and calculating the delay inequality of the ground station signal reaching the two satellites, and calculating the inter-satellite baseline distance. According to the method, a traditional satellite navigation system is not used, signals do not need to be demodulated, no requirement is needed for a signal system, the method has excellent anti-interference performance, and the defects of an existing autonomous measurement method and a non-autonomous measurement method for measuring the relative state of the satellite at present can be effectively overcome; the measurement method is independently developed in China, and potential safetyhazards do not exist.

Description

technical field [0001] The invention relates to a distance measuring method, which belongs to the field of satellite formation flight. Background technique [0002] The application of small satellite formations in synthetic aperture radar, three-dimensional high-resolution observation, meteorological observation, autonomous navigation, space-based interferometer and other fields has brought human spaceflight activities into a new era. Inter-satellite precision ranging has very high scientific value and application prospects. [0003] Although satellite formation flight can effectively overcome the defects of long development period, high cost, small aperture, and low measurement accuracy of a single large satellite, it also brings many new and challenging technical problems to researchers. The relative state of formation satellites includes the relative position, relative velocity and relative attitude between satellites in a certain coordinate system. The satellite's posi...

AI Technical Summary

Problems solved by technology

[0004] These methods have their own advantages and disadvantages: the GPS method has two problems, one is the real-time solution of the ambiguity of the whole week; the other is that it relies on the GPS satellite positioning system, which limits the application of my country's military satellites

The ground measurement and control station or tracking relay satellite system is characterized by low measurement accuracy and slow response time, and cannot be used for autonomous cooperative control between satellites

Pseudo-lite relative positioning technology is directly used for relative positioning between small satellites, and a large number of ground launch systems need to be established, which is very difficult in terms of funding and operation, and the practicability is not good

The advantages of the radio measurement method are long distance, high measurement coverage, strong real-time performance, all-weather work, and information communication function while measuring, meeting the requirements of miniaturization, low power consumption, and relative measurement of multiple spacecraft. is the accuracy is not very high

Laser measurement has the advantages of good confidentiality, strong anti-interference ability, good monochromaticity, high measurement accuracy, small size of measurement equipment, and high power; the disadvantage is that the beam is narrow, it is difficult to achieve simultaneous measurement of multiple targets, and other Measurement system to guide

Infrared measurement has the characteristics of simple structure, small size, light weight, high resolution, good concealment, and strong anti-interference ability. The disadvantage is that it is greatly affected by space background radiation and strong light, and the measurement accuracy is unstable. Distance information between targets

Visible light measurement is a passive detection technology. The disadvantage of this method is that it is difficult to fit multiple cameras on the satellite and maintain a long-term high-precision configuration. And the stability is reduced, and the measurement accuracy is poor in the environment with strong light

[0005] The ranging accuracy of the existing differential navigation receiver baseline measurement method and microwave measurement method cannot meet the ranging accuracy required by the dual-frequency interferometric SAR system.

Images