A measurement method for microsatellite multi-satellite formation

Abstract

The invention discloses a measurement method for micro-satellite multi-satellite formation. Including: setting the number of satellites in the formation; dividing a single measurement period into K consecutive time periods and numbering them; in the time period numbered N, the satellite numbered N is responsible for sending signals, and other satellites are responsible for receiving signals. The satellites record the local signal transmission time and reception time; based on the bilateral two-way measurement method, combined with the local signal transmission and reception time, the signal flight time measurement value M tof Preliminary measurements with time difference M clk ; After ionospheric dual-frequency combination calibration and hardware delay calibration, the inter-satellite distance measurement value m is obtained r and mid-term measurements of time difference m Δt ; Finally, the measured value of the inter-satellite distance m r and mid-term measurements of time difference m Δt Perform dynamic compensation to obtain the final measured value r of the inter-satellite distance ij and time difference final measured value Δt ij . The invention is based on the multi-satellite measurement system of time division multiple access and bilateral two-way measurement, which can meet the requirements of distributed measurement while ensuring the measurement accuracy.

Description

technical field [0001] The invention belongs to a measurement method, in particular to a measurement method oriented to multi-satellite formations of micro-satellites. Background technique [0002] At present, inter-satellite relative measurement mainly includes GPS (Global Positioning System, Global Positioning System) / GNSS (Global Navigation Satellite System, Global Navigation Satellite System) measurement and RF (Radio Frequency, radio frequency) radio measurement. GPS technology is mature and widely used, but it cannot be applied to medium and high orbits and deep space environments, while RF autonomous measurement and relative navigation can overcome these shortcomings, and the measurement accuracy is high. But at present, the research on inter-satellite autonomous measurement is still mainly based on the double-satellite formation. In the existing multi-satellite formation multiple-access measurement scheme, the measurement scheme based on frequency division multiple a...

AI Technical Summary

Problems solved by technology

The inter-satellite link of GPS navigation satellites adopts a time-division system, but its physical layer adopts a two-way forwarding measurement method. This method must rely on atomic clocks to achieve high measurement accuracy, but the resources of tiny satellites are limited, and it is difficult to configure atomic clocks.

The bilateral two-way measurement method can solve this problem. However, this method is currently only used in low-precision and low-dynamic scenarios on the ground, and has not been used in high-dynamic and high-precision scenarios on the satellite.

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