CAOCET GPS Code Multiplexing Power Optimization

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Solution Overview

Problem

Existing GPS code multiplexing methods require ternary adjustment (T/A) codes to maintain constant envelope transmission, which consumes power and is inefficient.

Innovation Solution

Implementing Channel-Amplitude-Optimized Constant Envelope Transmission (CAOCET) for GPS code multiplexing, eliminating the need for T/A codes by optimizing code power fractions and using a majority vote scheme, allowing for power savings and efficient signal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional GPS interplex code combining methods are used, then constant envelope transmission is maintained, but T/A code is required which consumes power

Engineering Contradiction:

Improvepower consumptionVSAvoidsystem complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the T/A code from the GPS signal transmission system by using CAOCET methodology. The system separates the constant envelope requirement from the code combining process, allowing multiple GPS codes to be combined without requiring the additional T/A code that traditionally balanced the signal envelope.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the transmission parameters by optimizing code power fractions for each QPSK modulated channel. Instead of using equal power fractions and requiring T/A code for envelope balancing, the system applies different optimized power fractions to I and Q channels, maintaining constant envelope through parameter optimization rather than additional balancing code.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If T/A code is added to balance GPS signals for constant envelope transmission, then signal distortion is prevented, but power is consumed and system complexity increases

Engineering Contradiction:

Improvesignal transmission reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by pre-calculating and storing optimized code power fractions in lookup tables before transmission. The system prepares the optimal power distribution for all possible code combinations in advance, allowing the transmitter to simply look up and apply the pre-determined power fractions without real-time calculation or T/A code balancing.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If multiple GPS codes are combined using conventional methods, then signal coverage is improved, but T/A code power allocation reduces available RF output power

Engineering Contradiction:

Improvecode multiplexing capabilityVSAvoidRF output signal power

Core Design Contradiction:

Adaptability or versatilityVSPower

Solution Approach 1:

The patent applies dynamics by making the code power fractions adjustable and adaptive rather than fixed. The system can dynamically optimize the power distribution among multiple GPS codes based on transmission conditions, allowing flexible code multiplexing while maximizing RF output power without being constrained by fixed T/A code power allocation.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP2942889B1System and method for code multiplexing

Publication Date: 2019.01.02 THE BOEING CO

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AI summary

A system and method include a modulator to combine satellite codes with a carrier signal on an I-Channel and a Q-Channel. A processor applies a code power fraction to the combined codes on the I-Channel and the Q-Channel to provide a unity amplitude while maintaining a phase angle so that a signal constant envelope transmission can occur without a balancing code.