Unlock instant, AI-driven research and patent intelligence for your innovation.

Signal demodulation method, device, equipment and medium with variable transmission rate

A technology of transmission rate and signal demodulation, which is applied in the field of satellite communication, can solve problems such as the inability to accurately search and compensate the frequency offset change rate, and achieve precise search and compensation and reduce the effect of impact

Active Publication Date: 2021-11-26
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a signal demodulation method, device, equipment and medium with variable transmission rate, which is used to solve the defect that the frequency offset cannot be accurately searched and compensated for the frequency offset change rate in the prior art, and realize the detection of low-orbit satellites. Accurate search and compensation for the frequency offset caused by the Doppler phenomenon caused by motion

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Signal demodulation method, device, equipment and medium with variable transmission rate
  • Signal demodulation method, device, equipment and medium with variable transmission rate
  • Signal demodulation method, device, equipment and medium with variable transmission rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] In the present embodiment, take the duty section to include 384 symbols, the rate 2Ksps is example, and wherein first 32 symbols are synchronous head; Take 256ksps as an example; firstly, the received data is segmented and buffered, and the service segment is divided into 6 segments with 64 symbols, and the service segment can be divided into 6 segments, while the data segment is divided into 256 symbols according to the speed gear of different service rates below 2k. The part of 2k and above is divided into sections of 128 symbols. Then generate the templates needed to search for the rate of change of frequency offset in the duty segment and the data segment. Due to the large dynamic range of the residual frequency offset in the service section, a relatively coarse template is used for searching. In this solution, the ±64Hz residual frequency offset is taken as an example, so 64 can be generated, the frequency range is -64Hz~+64Hz, and the interval is 2Hz sine wave. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a signal demodulation method, device, equipment and medium with variable transmission rate. The method includes: capturing the spread spectrum signal sent by the user; dividing the duty segment of the spread spectrum signal into a plurality of sub-duty segments for caching in sequence, and demodulating the cached sub-duty segment data; After the demodulation is completed, according to the data transmission rate of the data segment of the spread spectrum signal, the data segment of the spread spectrum signal is divided into a plurality of sub-data segments for sequential buffering, and the buffered sub-data segment data is demodulated. The present invention can perform real-time iterative demodulation on the spread spectrum signal whose data transmission rate is not constant, and has low complexity.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a signal demodulation method, device, equipment and medium with variable transmission rate. Background technique [0002] In recent years, with the rapid development of aerospace technology, satellite communication has gradually become an important direction for the development of the communication field. Among them, low-orbit satellites cover a large area of ​​the world, can achieve full global coverage without dead spots, and have a short transmission distance, and are an important part of satellite communications. However, low-orbit satellites move very fast. When they communicate with the ground, they will be affected by a strong Doppler phenomenon. At the same time, affected by factors such as distance, terrain, and weather, low-orbit satellites will The signal-to-noise ratio is low. Due to the limited transmission power of the satellite, a communication sy...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7077H04B1/7087H04L27/00
CPCH04B1/7077H04B1/7087H04L27/0014H04L2027/0026
Inventor 王帅陈超安建平卜祥元宋哲闫伟豪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY