Doppler Measurement Using Digital Phase Alignment
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Solution Overview
Problem
Conventional Doppler shift measurement techniques face limitations in accuracy, especially at low speeds, due to resolution constraints and the need for specialized hardware, which complicates precise measurement of frequency shifts and direction of movement.
Innovation Solution
The method employs RF Carrier Synchronization and Phase Alignment techniques using modulated carrier signals to accurately measure frequency shifts through digital signal processing, enabling high-resolution Doppler effect measurements without requiring specialized analog RF Front-End hardware, and allows for accurate relative speed and direction determination even in unsynchronized transceiver scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional Doppler shift measurement techniques are used, then measurement can be performed with simple hardware, but measurement precision deteriorates at low speeds due to resolution constraints
Solution Approach 1:
The patent replaces specialized analog RF Front-End hardware with digital signal processing techniques. Specifically, it uses RF Carrier Synchronization and Phase Alignment methods implemented in the digital domain to measure frequency shifts, eliminating the need for complex analog Doppler measurement hardware while achieving superior precision at low speeds.
Solution Approach 2:
The patent changes the measurement approach by using phase alignment techniques and digital signal processing parameters instead of analog frequency discrimination. By processing signals in the digital domain with appropriate algorithms, the system achieves high-resolution Doppler measurements without the hardware constraints of conventional analog methods.
2Measurement precision
If conventional Doppler measurement methods are used, then implementation is straightforward, but accuracy deteriorates due to resolution constraints
Solution Approach 1:
The patent substitutes analog RF measurement circuits with digital signal processing algorithms. The RF Carrier Synchronization and Phase Alignment methods are implemented through digital processing of baseband signals, replacing complex analog frequency measurement hardware with programmable digital algorithms that achieve superior accuracy.
Solution Approach 2:
The patent creates a universal measurement approach that can handle various scenarios (synchronized and unsynchronized transceivers, different speed ranges) using the same digital signal processing framework. The phase alignment technique provides a unified method for frequency shift measurement across different operating conditions, replacing multiple specialized analog circuits.
3Measurement precision
If conventional Doppler techniques are used, then hardware requirements are simple, but measurement accuracy deteriorates especially at low speeds
Solution Approach 1:
The patent replaces simple analog Doppler measurement circuits with sophisticated digital signal processing systems. The baseband processing stage implements RF Carrier Synchronization and Phase Alignment algorithms that provide high-precision velocity measurements, particularly at low speeds where conventional analog methods fail.
Solution Approach 2:
The patent moves the measurement process from the analog RF domain to the digital baseband domain, adding a dimension of computational processing. By converting RF signals to baseband and applying digital phase alignment techniques, the system achieves measurement capabilities in the digital domain that surpass analog hardware limitations.
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
This approach achieves high-precision Doppler shift measurements with accuracy up to 1 part per billion, effectively addressing the limitations of conventional methods by enabling accurate velocity and positioning calculations, including at low speeds and in dynamic networks.
Implementation Method 1
The Doppler effect is the observed shift in frequency caused by the relative motion of a target.
Implementation Method 2
generating a baseband information signal by mixing a received modulated carrier signal with a local oscillator (LO) signal
Data Source
AI summary
Described in this document are ways to accomplish high resolution and high dynamic range Doppler-Effect measurements for use in wireless communications and other applications such as positioning. Doppler Effect (interchangeably called Doppler shift or Doppler frequency shift) measurements have traditionally been done with purpose-built devices, such as pulse-based radars. Presented in this document are alternative ways to incorporate Doppler frequency shift measurement using modulated carrier signals with a conventional radio, without additional hardware.