Optoelectronic Rangefinder Angular Movement Sensor Signal Filtering
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Solution Overview
Problem
Hand-held observation and aiming devices with multi-shot pulsed lasers face challenges in maintaining precise laser targeting due to operator movement, leading to decreased signal-to-noise ratio and increased false echoes, especially when the target's angular size is comparable to the movement amplitude, making distance measurement difficult.
Innovation Solution
Incorporating an angular movement sensor to determine the angular radius of each laser pulse relative to the stabilized line of sight and a selector to process only signals from pulses within a defined angular radius, optimizing the signal-to-noise ratio by filtering out irrelevant echoes and allowing for real-time or post-processing signal weighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multi-shot pulsed laser is used for telemetry, then stealth capability is improved, but signal-to-noise ratio decreases and false echoes increase due to operator movement
Solution Approach 1:
The system performs preliminary stabilization of the line of sight using image processing before each laser pulse emission. The stabilizer continuously adjusts the optical axis based on detected image shifts, ensuring the laser is properly aimed at the target before firing, thereby preventing false echoes and improving signal quality while maintaining multi-shot stealth capability
Solution Approach 2:
The system uses feedback from the image sensor to continuously monitor and correct the line of sight position. The stabilizer receives real-time image data, processes it to detect movements, and adjusts the optical axis accordingly, creating a closed-loop control system that maintains accurate targeting throughout the multi-shot sequence
2Stability of the object's composition
If image stabilization is applied to observation channel, then stable image is obtained, but laser axis becomes unstable and aiming precision decreases
Solution Approach 1:
The stabilization function is segmented into two independent channels: the observation channel uses image processing stabilization to produce a stable image, while the laser channel uses separate angular movement sensing and correction to maintain aiming precision. This segmentation allows each channel to be optimized for its specific function without interfering with the other
3Measurement precision
If laser beam is sent in narrow sector for precise targeting, then aiming precision is improved, but difficulty in detecting and measuring increases due to operator movement
Solution Approach 1:
The system applies preliminary anti-action by continuously compensating for operator movements before the laser pulse is emitted. The stabilizer predicts and corrects for expected movements based on real-time image analysis, pre-aligning the laser axis with the target to maintain precision despite the narrow beam sector and operator vibrations
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 enhances the signal-to-noise ratio, reduces false echoes, and provides accurate distance measurements while maintaining stealth capabilities, allowing for improved target dimension and shape analysis.
Implementation Method 1
a multi-shot pulsed laser for emitting a plurality of outward laser pulses in the direction of the target to be telemetered
Implementation Method 2
a detector for a plurality of return laser pulses reflected by the scene in order to generate an electrical signal for each return laser pulse
Data Source
AI summary
The invention concerns an opto-electronic device for observing and/or aiming at a scene comprising a target (C), comprisingan observation module (1) comprisingan image sensor (10) anda stabiliser (11) for a line of sight (100) towards the target (C); anda telemeter (2) comprisinga multi-shot pulsed laser (20) for emitting a plurality of outward laser pulses (An) in the direction of the target (C) to be telemetered, anda detector (21) for a plurality of return laser echoes (Rn) reflected by the scene in order to generate an electrical signal for each return laser echo (Rn) in order to effect a measurement of the distance to the target (C), each return laser echo (Rn) corresponding to an outward laser pulse (An);characterised in that it also comprisesa sensor (3) of angular movement of the device with respect to the stabilised line of sight (100) in order to determine an angular radius (ρn) of each outward laser pulse (An) with respect to the stabilised line of sight (100); anda selector (4) for processing each electrical signal, corresponding to a return laser echo (Rn), according to the angular radius (ρn) of the corresponding outward laser pulse (An).The invention also concerns a telemetry method implemented on such a device.