SPD1200ZG 905 nm SPAD Laser Rangefinder Module with Six-Axis Inertial Sensing - GST inc

austarsmodel@yahoo.com (Austars Model Pty Ltd) — Fri, 06 Nov 2026 17:21:26 +0800

Distance, Attitude, and Relative 3D Measurement

The SPD1200ZG combines compact 905 nm pulsed laser ranging with integrated inertial angle sensing for OEM systems that need distance, attitude, and relative three-dimensional point-to-point measurement in one lightweight module.

It supports single and continuous ranging, configurable angle reporting, and UART-TTL communication for host integration.

Nominal body dimensions are 7.2 × 14.7 × 22.3 mm and weight is no more than 5 g; the complete installation envelope is governed by the current mechanical drawing.

SPAD-based pulsed ranging

905 ± 5 nm direct time-of-flight ranging with single-photon reception for weak optical returns.

0.1–1200 m specified range

Rated with visibility ≥10 km, humidity ≤60%, and a building target.

Integrated six-axis inertial sensing

Configurable roll, pitch, and relative yaw/heading reporting for angle-enabled builds.

Relative 3D point-to-point measurement

Combines local range and angle information for target-point coordinates and spatial separation.

Compact OEM package

Nominal body size 7.2 × 14.7 × 22.3 mm, 6061 aluminum-alloy housing, and weight ≤5 g.

Flexible host integration

UART-TTL communication, 115200 bps default baud rate, and a 2–10 Hz measurement update rate.

TECHNICAL DATA

SPD1200ZG Specifications

Read each performance value with its stated target, environmental, operating, and installation conditions.

Optical and ranging

Parameter	Value	Conditions / notes
Laser wavelength	905 ± 5 nm	�
Beam divergence	<6 mrad; small beam spot	�
Optical element	Aspheric lens	�
Receiver aperture	Ø6.5 mm	�
Measurement range	0.1–1200 m	Visibility ≥10 km; humidity ≤60%; building target
Ranging accuracy	±0.5 m at d ≤100 m; ±(0.5 m + 0.0007d) for 100 m < d <1200 m	�
Measurement update rate	2–10 Hz	�
Measurement success rate	≥98%	�
False alarm rate	≤1%	�
Laser safety class	IEC Class 1	�

Electrical and environmental

Parameter	Value	Conditions / notes
Communication interface	UART-TTL; customizable	�
Default baud rate	115200 bps	�
Supply voltage	3.3–5 V	�
Startup time	≤200 ms	�
Peak startup current	≤200 mA	�
Standby power consumption	≤0.3 W	�
Average power consumption	≤0.7 W	�
Operating temperature	−20 to +60 �C	�
Storage temperature	−30 to +70 �C	�
Ingress protection	IP67 within the lens cavity	�

Mechanical

Parameter	Value	Conditions / notes
Nominal module body	7.2 × 14.7 × 22.3 mm; rectangular	The complete installation envelope includes protruding features; use the current mechanical drawing.
Housing material	6061 aluminum alloy	�
Weight	≤5 g	�
Width across protruding features shown in drawing	9.8 ± 0.2 mm	�
Core width shown in drawing	7.2 +0.01/−0.03 mm	�
Height shown in drawing	14.7 +0.01/−0.03 mm	�
Axial dimensions shown in drawing	22.3 ± 0.1 mm and 21.3 mm	�
Mounting features shown in drawing	2 × M1.6; 5.2 ± 0.02 mm spacing feature	�
Optical features shown in drawing	2 × Ø6.5; 7.5 ± 0.01 mm spacing feature	�
Center-of-gravity coordinates shown in drawing	7.1, 4.8, 10.7	�

Inertial measurement

Parameter	Value	Conditions / notes
Roll range, X axis	±180�	�
Pitch range, Y axis	±90�	�
Yaw range, Z axis	±180�	�
X/Y tilt accuracy	0.3�	�
Z-axis heading accuracy	≤0.75� within a 10 s dynamic measurement interval	Integration error accumulates during motion; this is relative heading, not an absolute north reference.
Axis orientation	Y axis points toward the lenses	�

3D point-to-point � radial error

Parameter	Value	Conditions / notes
d ≤500 m	±1 m	Distance variable d follows the product specification.
500 m < d <1200 m	±(1 m + 0.001d)	Distance variable d follows the product specification.

3D point-to-point � static maximum absolute error

Parameter	Value	Conditions / notes
<100 m	≤1 m	�
100–500 m	≤3 m	�
500–1000 m	≤5 m	�

3D point-to-point � dynamic maximum absolute error

Parameter	Value	Conditions / notes
<50 m	≤1 m	�
50–100 m	≤3 m	�
100–500 m	≤6 m	�
500–1000 m	≤10 m	�

HOW IT WORKS

Pulsed Time of Flight and SPAD Reception

Pulsed Time-of-Flight Ranging

The module transmits a short optical pulse and detects light reflected from the target. If the measured round-trip transit time is Δt, the geometric one-way range is R = cΔt / 2. The factor of two accounts for the outbound and return paths.

Timing resolution, pulse width, receiver bandwidth, target reflectivity, incidence angle, background illumination, and beam divergence influence practical ranging performance. [1]

R = c × Δt / 2R: one-way geometric distance · c: speed of light along the path · Δt: measured round-trip transit time

SPAD-Based Single-Photon Reception

This SPD1200ZG configuration uses SPAD-based single-photon reception. A single-photon avalanche diode can register individual photon events.

In direct-ToF systems generally, repeated photon detections may be organized in time bins so that a return concentrated around one delay can be distinguished from background detections. Ambient illumination, detector dead time, pile-up, and finite timing resources are recognized constraints. [2] [3]

The standard customer interface reports processed measurements; it does not claim access to raw photon timing data or a particular internal processing algorithm.

INERTIAL + 3D

Six-Axis Inertial Measurement Explained

A conventional six-axis IMU comprises three orthogonal gyroscope angular-rate channels and three orthogonal accelerometer specific-force channels. Six-axis describes six sensing channels, not six independent rotational axes. [6]

Angle reporting is configurable and does not imply that the standard customer interface exposes all six raw sensor channels. Available outputs are defined by the configuration-matched interface protocol.

For a fixed single-axis rotation, the conceptual relationship is θ(t) = θ₀ + ∫ω(t)dt. Angular-rate bias and noise create accumulated angle drift. Three-axis attitude estimation requires an appropriate coordinate convention. [5]

Measurement	Rating
Roll	±180� about the X axis
Pitch	±90� about the Y axis
Relative yaw / heading	±180� about the Z axis
X/Y tilt accuracy	0.3�
Z-axis heading accuracy	≤0.75� within a 10 s dynamic measurement interval

Integration error accumulates during motion. This is relative heading, not an absolute north-referenced compass specification.

Coordinate Convention

Use the current manual's X/Y/Z convention when interpreting angle-enabled output.

Coordinate AxesThe Y axis points toward the lenses. Use the coordinate convention in the current user manual.

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