Ranging Sensor Doppler Shift Compensation
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Solution Overview
Problem
Conventional remote sensing systems, such as LADAR and LiDAR, face measurement uncertainties and errors due to Doppler shifts caused by motion between the sensing system and the target, leading to inaccurate target information, particularly when the system and target are in motion relative to each other.
Innovation Solution
A remote sensing system utilizing frequency-modulated continuous wave (FMCW) techniques with dual sensor channels emitting correlated but mutually incoherent beams to accurately determine Doppler components and generate reliable target information, including range, direction, and velocity, by processing reflected beam sensor signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional remote sensing systems are used to detect targets, then basic ranging capability is provided, but measurement precision deteriorates due to Doppler shifts caused by relative motion between the sensing system and target
Solution Approach 1:
The patent divides the sensing system into multiple sensor channels (at least two channels) that emit separate modulated sensor beams toward the target. Each channel independently measures Doppler-shifted reflected beams, allowing the system to segment the measurement process and compute accurate target information by combining results from multiple channels, thereby overcoming the limitations of conventional single-channel systems under relative motion conditions
Solution Approach 2:
The system employs feedback mechanisms where the controller continuously processes reflected beam sensor signals from multiple channels, identifies Doppler components, and adjusts measurements in real-time. This feedback loop enables the system to compensate for relative motion between the sensing system and target, maintaining high measurement precision and reliability dynamically
2Measurement precision
If Doppler shift compensation techniques are implemented, then target information accuracy improves, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies preliminary action by pre-modulating sensor beams with known frequency modulations before emission. This allows the system to anticipate and prepare for Doppler shift effects, enabling simpler subsequent processing where the controller only needs to identify and compare the pre-modulated frequency components in the reflected beams rather than performing complex real-time Doppler compensation
Solution Approach 2:
The system introduces an intermediary processing stage where the controller identifies Doppler components as a separate intermediate step between receiving reflected beams and generating final target information. This intermediary approach simplifies the overall processing by breaking down the complex task into manageable stages: first identify Doppler shifts, then use those results to compute accurate target range, direction, and velocity
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 system provides highly accurate and reliable target information, reducing errors and improving interpretation of target position and motion, even under conditions of relative motion between the sensing system and the target.
Implementation Method 1
determine Doppler components associated with the first and second reflected beams based, at least in part, on the first and second reflected beam sensor signals
Implementation Method 2
frequency-modulated continuous wave (FMCW) techniques
Data Source
AI summary
Techniques are disclosed for systems and methods to provide accurate and reliable target information when there is relative motion between a remote sensing system and the target. A remote sensing system includes a multichannel ranging sensor assembly and a controller. The ranging sensor assembly includes multiple sensor channels configured to emit modulated sensor beams towards a target and to detect corresponding reflected beams reflected from the target, where the modulated sensor beams are selected to be correlated to each other and mutually incoherent with respect to each other. The controller is configured to receive reflected beam sensor signals corresponding to the detected reflected beams, to determine Doppler components associated with the reflected beams based, at least in part, on the first and second reflected beam sensor signals, and to generate target information based, at least in part, on the determined Doppler components.