A solution for space-based Internet of Things signal processing with variable message rate

Abstract

The present invention provides a space-based Internet of Things signal processing solution with a variable message rate, which is characterized in that it includes the following steps: Step 1, the antenna receives the signal transmitted by the satellite end of the space-based Internet of Things system, and the ground terminal sends the radio frequency signal down Frequency conversion to intermediate frequency signal step 2, sampling the intermediate frequency signal in step 1 to obtain signal s(n); step 3, capturing the sampled signal s(n) to obtain the code phase and code Doppler of the m1 leading segment Le, Carrier Doppler; Step 4, track the m1 leading segment, deframe and find the end sign message of the m1 lead segment; step 5, continue to track and analyze the m2 lead segment, find the end sign message of the m2 lead segment, when the m2 lead segment Immediately after the end, switch the local pseudo-code to the GOLD sequence segment; step 6, continue to track and analyze the GOLD sequence segment, and extract the required data packet message, etc. The present invention can greatly reduce the capture time through the hierarchical parallel search capture method, and then can greatly reduce the duration of the m1 leading segment, thereby increasing the number of terminal access.

Description

technical field [0001] The invention belongs to the field of communications, and in particular relates to a signal processing solution for a space-based Internet of Things with a variable message rate. Background technique [0002] In recent years, the Internet of Things technology has developed rapidly and has been widely used in smart home, industrial automation and other fields. It is regarded as the third wave of the development of the world's information industry after computers and the Internet. With the development of mobile communication technology, global telecom operators have built mobile cellular networks covering the whole world. However, if the mobile cellular communication technology is directly applied to the Internet of Things, there will be problems such as high power consumption and high cost of the equipment. In order to adapt to the development trend of the Internet of Everything, a low-power, long-distance, low-cost, and large-capacity IoT connection t...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of long time for terminals to access satellites and a small number of accesses per unit time in the space-based Internet of Things system, and propose a method based on code division multiple access + space division multiple access + frequency division multiple access + Time-division multiple access space-based IoT signal system, and the proposed signal system has the characteristics of variable message rate, and a signal processing solution is proposed for this signal system

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