Cellular Satellite Device Chirp Spread Spectrum Modulation
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Solution Overview
Problem
Existing satellite phones have limitations such as requiring large and powerful antennas, poor performance indoors or in terrain like mountains or forests, low connection speeds, significant communication latency, and vulnerability to signal propagation loss and interception.
Innovation Solution
A compact communication device that uses satellites and cellular networks to enable reliable and rapid global communication, capable of operating standalone or paired with a smartphone app. The device employs chirp spread spectrum modulation, specifically the LoRa standard, to efficiently transmit messages over a narrow bandwidth, allowing for multiplexing within a standard satellite channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional satellite phones use large and powerful antennas with direct line-of-sight, then signal strength is improved, but device portability and ease of use in various terrains deteriorates
Solution Approach 1:
The patent changes the modulation parameter from traditional GSM to chirp spread spectrum (CSS), which allows signals to be transmitted effectively without requiring large antennas or direct line-of-sight. This parameter change enables reliable communication while maintaining device portability and ease of operation in various terrains.
2Adaptability or versatility
If conventional satellite phones use GSM with 200 kHz channel spacing, then communication compatibility is improved, but resource efficiency and multiplexing capability deteriorates
Solution Approach 1:
The patent changes the channel spacing parameter from 200 kHz (GSM) to much narrower bandwidth using CSS modulation. This allows multiple signals to be multiplexed within a single satellite channel, dramatically improving resource efficiency and multiplexing capability while maintaining communication functionality.
3Adaptability or versatility
If conventional satellite communication protocols are used, then global coverage is achieved, but signal propagation loss and communication latency increase
Solution Approach 1:
The patent changes the modulation technique to chirp spread spectrum, which provides resistance to signal propagation loss through its inherent processing gain and ability to penetrate obstacles. This enables reliable global coverage communication while mitigating the effects of signal degradation.
4Reliability
If conventional satellite phones are used, then satellite communication capability is provided, but connection speed and communication delay deteriorates
Solution Approach 1:
The patent changes the modulation parameter to chirp spread spectrum with optimized bandwidth utilization, which improves connection speed by enabling more efficient data transmission within the available satellite channel bandwidth, reducing communication delay while maintaining reliable satellite communication capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides reliable communication from any location, including areas where conventional networks are unavailable, with low latency and high signal-to-noise ratio, ensuring effective communication in adverse conditions without the need for precise satellite aiming.
Implementation Method 1
The transceiver unit uses chirp spread spectrum modulation or similar and modulates the carrier wave with the packet and sends the signal to the satellite
Data Source
AI summary
A device for communicating via satellite includes a transceiver unit operable to transmit a signal comprising a packet encoded by modulation of a carrier wave from the device to a satellite, a controller unit coupled to the transceiver unit and operable to control operations of the transceiver unit; and a personal area network (PAN) connection that communicatively couples the device with a smartphone. The transceiver unit modulates the carrier wave with the packet via chirp spread spectrum modulation or similar and sends the signal to the satellite within a designated band of frequency such as the L-, S-, C-, X-, Ku, Ka, Q-, or V-Band of spectrum.