I. NLM4000A 1535nm DPSS Eye-Safe Telemetry Core

Precision Sensing for Next-Generation UAV Detection and Strategic Platforms.

Engineering Constraints: In the evolving landscape of autonomous aerial operations, integrators often face a critical trade-off between ranging depth and payload weight. Traditional long-range sensors frequently suffer from atmospheric attenuation in coastal fog or high-humidity environments, while their bulk compromises gimbal stability and flight endurance.

Design Philosophy: The development of the UAV Laser Rangefinder Module NLM4000A was driven by the necessity for a high-fidelity 1535nm Erbium-glass (DPSS) laser source that maintains absolute Class 1 eye safety. This wavelength was specifically chosen for its superior performance within the 1.5μm atmospheric window, allowing for reliable 4km strategic detection and the tracking of 0.1m x 0.2m small-scale drone targets at distances exceeding 1km. By optimizing the optical resonance cavity, we reduced the total mass to a mere 90g.

Integration Impact: This mission-critical reduction in weight significantly lowers the moment of inertia for UAV gimbals, enhancing stabilization precision during high-speed tracking. The NLM4000A provides a SWaP-C optimized solution that ensures reliable distance data under conditions of visibility ≥ 15km and humidity ≤ 80% RH, closing the loop on strategic aerial sensing.

UAV Payload Integration

1535nm Eye-Safe Radar

C-UAV Tracking Sensor

Maritime Surveillance Engine

Strategic Border Security

II. Technical Superiority of the Strategic Telemetry Core

High-Frequency Acquisition: Supports up to 5Hz repetition rates for dynamic tracking of low-altitude UAV threats.
Advanced Signal Integrity: Delivers a ≥ 98% accuracy rate with a false alarm rate (FAR) minimized to ≤ 2%.
Proximity Mastery: Features a ≤ 20m blind zone, ensuring reliable target engagement in close-quarters C-UAV scenarios.
Mission-Critical Security: The covert 1535nm wavelength remains invisible to standard night-vision devices for secure border monitoring.

III. Application Scenarios for Strategic Sensor Platforms

C-UAV Tracking & Anti-Drone Systems

Optimized for counter-UAV missions, the NLM4000A provides precise ranging for dynamic targets as small as 0.1m x 0.2m at distances exceeding 1000m. This real-time telemetry is essential for automated interception and high-speed target acquisition.

Maritime Surveillance & Border Security

With its IP67-protected chassis, the module accurately measures medium-sized vessels (20m x 50m) at distances of ≥ 4000m. It is engineered to perform in coastal high-humidity and salt-spray environments without signal degradation.

Aerial Surveying & Industrial Automation

The combination of ≤ ±2m precision and a lightweight footprint allows for seamless UAV payload integration for infrastructure monitoring and autonomous robot navigation in complex outdoor terrains.

IV. NLM4000A Technical Specification Matrix

Parameter Item	NTRON Standard Technical Values
Dimensions & Weight	≤ 65mm × 49mm × 36mm; ≤ 90g
Laser Technology	1535nm Erbium-glass (DPSS) / Class 1
Range (UAV Target)	≥ 1000m (0.1m × 0.2m, Reflectivity 0.3)
Accuracy & FAR	≤ ± 2m Accuracy (≥ 98% Rate); ≤ 2% False Alarm Rate
Range (Maritime Target)	≥ 4000m (20m × 50m, Reflectivity 0.3)
Operating Temp.	-40℃ to +60℃ (Storage: -50℃ to +70℃)
Testing Conditions	Visibility ≥ 15km; Relative Humidity ≤ 80%
Blind Zone	≤ 20m
Pulse Frequency	Single-shot, 1Hz, 5Hz
Beam Divergence	≥ 1.5mrad
Electrical Supply	DC 12V
Power Consumption (Peak / Avg)	Peak ≤ 5W \| Avg ≤ 2W
Communication Interface	TTL
Baud Rate	38400bps (Default) / 9600 / 57600 / 115200 bps
Aperture (Tx / Rx)	Φ 11mm / Φ 26mm

V. OEM Integration & Electrical Interface

Power Consumption Profile: Average operation ≤ 2W; Peak power ≤ 5W.
Connector Models: Rangefinder-side: A1251WR-S-8P; Mating plug: A1251H-8P.
Communication: TTL serial interface with default baud rate of 38400bps (Supports up to 115200bps).

Pin No.	Label	Functional Remarks
P-1 / P-2	NC	No Connection
P-3	TTL-TXD	Serial Data Transmit
P-4	TTL-RXD	Serial Data Receive
P-5	TTL-GND	Interface Signal Ground
P-6	+12V	Main Power Input (+12V DC)
P-7	GND	Power Ground
P-8	Reserved	Reserved for Future Use

VI. Mechanical and Optical Interface Specifications for 4km Modules

The NLM4000A structural blueprint is designed for rigid fixation on aerospace platforms, utilizing a secure 4 × Φ 3mm threaded mounting pattern.

NLM4000A UAV Laser Rangefinder Module Dimensions and Optical Interface

NLM4000A dimensions (≤ 65x49x36mm) showing Φ 11mm transmitter and Φ 26mm receiver apertures.

Effective Aperture: Tx Φ 11mm, Rx Φ 26mm | Mounting: 4 × Φ 3mm threaded holes (30±0.1mm x 20±0.1mm anchoring centers).

Optical Window Orientation: Integrated Φ 11mm laser emission window and Φ 26mm large-aperture reception window for optimized signal-to-noise ratio.
Structural Blueprint: The rigid ≤ 65mm chassis length ensures a low profile within miniaturized UAV gimbal pods. Factory-calibrated optical axis stability is maintained under high-vibration conditions.
Optical Protection: To protect the mission-critical Erbium-glass core, avoid direct exposure of the receiver optics to high-intensity sunlight. ESD-safe handling is mandatory during installation.

VII. UAV Laser Rangefinder Module Universal Adaptability

The NLM4000A is engineered for a seamless fit across multiple strategic domains, providing a standardized telemetry solution for next-generation unmanned systems. Its lightweight 90g design ensures it remains the premier UAV Laser Rangefinder Module for payload integrators, while its robust 1535nm wavelength provides the covertness required for anti-drone tracking and coastal observation missions. With native support for secondary development through its SDK and versatile repetition rates up to 5Hz, it offers a future-proof solution for infrastructure monitoring, autonomous robotics, and advanced aerial surveying platforms worldwide.