Telemeter Spatial-Temporal Signal Selection
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Solution Overview
Problem
Current laser telemetry systems face limitations in range and accuracy due to noise interference and inefficient signal processing, particularly when detecting targets with small dimensions or in motion, where post-integration methods are ineffective and require excessive frame summation to achieve desired signal-to-noise ratios.
Innovation Solution
A telemeter device with spatial and temporal detection capabilities, utilizing a selective post-integration process based on spatial signal feedback to adaptively process frames, thereby reducing noise interference and improving signal detection efficiency by selectively transmitting frames for post-integration, and incorporating features like temporal labeling and target pursuit mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If post-integration is applied to all frames to improve signal-to-noise ratio, then detection sensitivity improves, but the number of frames required increases exponentially when target presence probability is low
Solution Approach 1:
The patent applies preliminary spatial detection and temporal labeling to frames before post-integration. By预先 marking frames with temporal labels indicating target presence probability, the system can selectively integrate only those frames likely to contain target echoes, avoiding the exponential increase in total frames needed when integrating all frames indiscriminately.
Solution Approach 2:
The system uses feedback from spatial detection results to guide the post-integration process. Frames are selected for integration based on spatial signal characteristics and temporal labels, creating a feedback loop where detection results inform subsequent integration decisions, thereby reducing the number of frames required compared to blind integration of all frames.
2Area of stationary object
If laser beam divergence is increased to cover larger target areas, then target coverage improves, but telemeter range deteriorates
Solution Approach 1:
The patent employs dynamic beam divergence control where the laser beam divergence is adjusted based on target distance and detected target characteristics. For distant targets, lower divergence maintains range; for closer or larger targets, divergence increases to ensure full coverage, optimizing the trade-off between range and coverage area dynamically rather than using fixed divergence.
Solution Approach 2:
The system changes the beam divergence parameter adaptively based on ranging results and target detection data. By modifying this critical parameter in response to real-time conditions, the system achieves both adequate target coverage and maintained telemeter range, resolving the contradiction between these two requirements.
3Length of stationary object
If pulse energy is increased to extend detection range, then telemeter range improves, but ocular safety constraints and device volume are worsened
Solution Approach 1:
The system performs preliminary spatial detection and temporal labeling at lower pulse energies to identify potential target locations and characteristics before committing to high-energy pulses. This preliminary action allows the system to extend range through intelligent signal processing rather than simply increasing pulse energy, thereby avoiding ocular safety risks while maintaining detection capability.
Solution Approach 2:
The patent replaces the mechanical approach of increasing pulse energy to extend range with an information-processing approach using spatial detection, temporal labeling, and selective post-integration. This substitution allows range extension through smarter detection algorithms rather than brute-force energy increase, eliminating the associated ocular safety hazards and device volume increases.
4Device complexity
If spatial detection and temporal detection are performed sequentially, then processing simplicity is maintained, but detection efficiency deteriorates for mobile targets
Solution Approach 1:
The patent performs preliminary spatial detection to identify target presence and characteristics before conducting temporal detection and post-integration. This preliminary spatial assessment allows the system to focus temporal processing only on relevant time windows and selected frames, maintaining processing simplicity while significantly improving detection efficiency for mobile targets by avoiding unnecessary processing of irrelevant data.
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
Enhances the detection of laser echoes by reducing noise interference and improving signal processing efficiency, allowing for more accurate distance measurement and target tracking with reduced operational complexity and increased accuracy, especially for mobile targets.
Implementation Method 1
An optical telemeter uses the propagation of light as measuring means
Implementation Method 2
The target reflects or backscatters this light
Implementation Method 3
The target reflects or backscatters this light
Implementation Method 4
The optical echo of the target is converted into an electrical signal by the detector
Implementation Method 5
a temporal detection device which comprises at least one photodiode coupled to a transimpedance circuit
Data Source
AI summary
A device for measuring a distance of a target by means of a telemeter comprises: a laser pulse emitter; a receiver of the laser echoes backscattered by the target, comprising, a spatial detection device which comprises at least one photodiode set up as integrator and is able to provide a spatial signal, and a temporal detection device which comprises at least one photodiode coupled to a transimpedance circuit and is able to provide a so-called temporal signal, means of processing of the spatial signal and of the temporal signal, comprising a unit for calculating the distance of the target, the temporal signal being in the form of a data frame which is the recording of data detected over a predetermined duration. The means of processing comprise: means of post-integration of temporal signals, linked at output to the unit for calculating the distance of the target, linked to the spatial detection device and to the temporal detection device, means for selecting the temporal signals to be transmitted to the post-integration means, as a function of the spatial signal.