Trimble SPS855 GNSS Receiver & SPS751 Antenna Set Unit

Module Feature

SPS855 is Trimble modular GNSS receiver, SPS751 is its matched GNSS antenna. The combination forms a complete RTK positioning system. It supports GPS, GLONASS, Galileo, BeiDou multi-satellite constellation tracking, can be configured as base station or rover. Built-in optional 450MHz / 900MHz UHF radio for wireless RTK correction transmission. Supports Location RTK and Precision RTK license upgrade, positioning accuracy can reach centimeter level. Front panel with display and keypad, local parameter setting without controller. Rugged waterproof housing, anti-shock and anti-vibration, suitable for construction site, earthwork machinery, dredging and marine engineering positioning. Widely matched with Trimble Earthworks, GCS900 machine control systems.

Working principle

SPS751 antenna receives satellite GNSS signals and transmits to SPS855 receiver. The receiver resolves raw satellite observation data. When working in RTK mode, base station sends differential correction data through internal radio, rover calculates high-precision coordinate after correction. It outputs position, heading and pulse signals to machine controller for automatic grading and navigation control.

Onboard components

SPS855:GNSS mainboard, internal UHF radio module, display & keypad, Bluetooth, serial/Ethernet communication circuit, data logging memory, power regulation circuit. SPS751:GNSS antenna element, LNA low noise amplifier, weatherproof antenna housing, antenna mounting base.

LED indicators

Front panel LED indicators for power, satellite tracking, RTK fix, radio link and fault alarm.

Hardware self‑diagnosis

Self-diagnosis covers satellite signal loss, antenna open/short circuit, radio link failure, overvoltage, overtemperature and license abnormality. Fault codes display on local screen.

Programming software

Configuration and diagnosis use Trimble SCS900 / Siteworks software; post-processing uses Trimble Business Center.

Electrical & Process Parameters

Model:SPS855 + SPS751 Brand:Trimble Device type:Modular RTK GNSS receiver and antenna kit Constellation:GPS, GLONASS, Galileo, BeiDou Positioning mode:SBAS, DGPS, Location RTK, Precision RTK Radio option:403~473MHz UHF / 900MHz Update rate:Up to 20Hz Output:NMEA, 1PPS, differential RTCM Function:Centimeter-level GNSS positioning for construction machine control and surveying

Mechanical & Structure

SPS855 mounting:Cabinet / pole mount SPS751 mounting:Survey pole / roof / mast mount Protection class:IP67 Housing:Rugged reinforced plastic housing

Environmental

Operating temperature:-40℃ ~ +65℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:CE, FCC compliant Status:Trimble original GNSS spare set

Installation

Install SPS751 antenna at open sky position, avoid shelter and multipath reflection. Connect antenna cable to SPS855 RF port. Power the receiver, set base/rover mode, radio frequency and RTK license. Check satellite tracking and RTK fixed status before use.

Interface

Antenna RF port, serial port, Ethernet, Bluetooth, radio antenna port, power terminal, 1PPS signal output.

Diagnostic

No satellite tracking:Antenna cable broken, antenna damage or obstruction. RTK cannot fix:Radio frequency mismatch, correction signal loss, baseline too long. Position drift:Multipath interference, antenna installation position unreasonable.

Product Brief

Trimble SPS855 modular GNSS receiver with SPS751 antenna, multi-constellation centimeter RTK, built-in UHF radio, rugged IP67 design, used for construction machine control, earthmoving and hydrographic survey.