A multi-path downlink system for all-track 16kbps telemetry data

Abstract

The invention discloses an all-track 16Kbps telemetering data multi-path downloading system which comprises a star service center computer, lower computers, a star service data storage module, an S-band responder, a relay control unit, a data transmission system data repeater, a solid-state memory, a controller area network (CAN) bus and a low voltage differential signaling (LVDS) bus, wherein the star service center computer is connected with each star online lower computer through the CAN bus and is used for collecting and formatting the whole-satellite telemetering data and transmitting the formatted telemetering data to the S-band responder, the relay control unit and the star service data storage module; the star service data storage module receives and stores important data of a global position system (GPS) and an attitude control lower computer and the whole-satellite telemetering data through the CAN bus and transmits the data to a data repeater of a data transmission subsystem through the LVDS bus; meanwhile, all the data stored in the star service data storage module is transmitted back to the star service center computer through the CAN bus. According to the system, lots of telemetering data can be rapidly downloaded in real time and downloaded through multiple paths during satellite transit, and the needed time of downloading the key telemetering data is reduced.

Description

technical field [0001] The invention relates to a system and method for multi-path downlinking of satellite telemetry data, which is particularly suitable for downlinking of satellite full-orbit, full-time and a large amount of telemetry data. Background technique [0002] Satellite telemetry data is the only way for the ground to understand the working status and health status of the satellite. The commonly used satellite telemetry data download method is mainly to collect the telemetry parameters of each subsystem through the on-board bus by the computer of the star service center, package them, form a common telemetry data format, modulate it into a DPSK signal, and then download it through the measurement and control channel . [0003] Due to the constraints of our country's geographical location and measurement and control system, for sun-synchronous orbit satellites, only 6-7 orbits pass the border of our country every day, and the time for each transit is only about ...

AI Technical Summary

Problems solved by technology

However, this method has the following problems: (1) The downlink code rate of the measurement and control channel of this method is 4096bps, the capacity of the data storage module is 128M, and the transmission code rate of the LVDS interface is 1Mbps, which cannot meet the storage and download of telemetry data at a higher code rate; (2) This method focuses on the downloading of telemetry data, and does not fully consider the multi-path transmission of on-board information. In this method, the data in the data storage module can only be downlinked through the digital transmission channel. When the digital transmission channel fails to work, the stored The telemetry data cannot be downlinked; (3) Limited by the storage capacity of the FLASH chip, this method can only store 36 hours of satellite telemetry data, and the data not downloaded for more than 36 hours will be overwritten; (4) The telemetry data stored by this method can only wait until Data transmission can only be applied after power-on and downloading, and can only be applied after a series of ground processing. After the abnormality of the satellite in orbit, the relevant telemetry data cannot be analyzed in time

[0005] In summary, the existing technology has disadvantages such as low telemetry downlink code rate, single downlink path, and small data storage capacity, which is not conducive to the monitoring of satellite full-orbit operation status, and affects the analysis and timely positioning of satellite in-orbit problems.

Images