Smart Antenna HX-ME404A Integrated with RTK Module UM980

Introduction
Key Features
Parameters
Applications
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Introduction

HX-ME404A is an embedded multi-band multi-constellation smart antenna developed by Harxon. Combining Harxon’s world leading antenna technology with Unicore’s full-constellation full-frequency RTK positioning module UM980, HX-ME404A delivers precise positioning performance in a compact and integration-ready structure. It's able to provide single point meter level accuracy, DGPS sub-meter level accuracy and RTK centimeter/millimeter level accuracy, very suited for robotic lawn mower and unmanned aerial vehicle (UAV) applications that require precise location and precise heading.

Full-band Multi-constellation GNSS Support
Smart Helix Antenna Integrated with RTK Module UM980
RTK Accuracy: Horizontal: 0.8cm+1ppm, Vertical: 1.5cm+1ppm
DGPS Accuracy: Horizontal: 0.4m, Vertical: 0.8m
Small size, light weight (≤15g) and integration-ready structure
Single Point Accuracy: Horizontal: 1.5m, Vertical: 2.5m

Key Features

Integrated Design and Compact Form Factor

The compact smart antenna, weighing ≤15g and measuring Φ46*H19.2mm, greatly reduces the weight of UAVs and features low power consumption. Additionally, the antenna and board are well compatible with each other, simplifying the development process.
Precision-Tuned OEM GNSS Antenna

The main part of HX-ME404A is an ultra-low profile Harxon helix antenna designed for high precision positioning of UAV. It excels in offering superior satellite signal tracking. The antenna provides excellent axial ratios, enables excellent multipath mitigation and a very precise phase center.
High Performance RTK Positioning Module

Integrated with Unicore’s full-constellation full-frequency RTK positioning module, which integrates RF, baseband and high precision algorithm, it can track multiple frequencies of all GNSS systems, enabling the module to output high-precision RTK positioning.
Strong Anti-Interference Performance

HX-ME404A is capable of offering superior positioning performance in challenging environments. The antenna equips a robust pre-filtered LNA that features an excellent out-of-band interference rejection performance, and the module features 60 dB narrowband anti-jamming.

Parameters

Signal Received	GPS L1C/A, L2C, L2P(Y), L5 GLONASS G1, G2 BDS B1I, B2I, B3I, B1C, B2a GALILEO E1, E5a, E5b, E6 SBAS L1C/A QZSS L1C/A, L2C, L5
Nominal Impedance	50Ω
Polarization	RHCP
Axial Ratio (@Zenith)	≤3dB
Azimuth Coverage	360°
Peak Gain	3dBi

RTK Connection
Positioning Module	UM980
Single Point Accuracy	Horizontal: 1.5m Vertical: 2.5m
DGPS Accuracy	Horizontal: 0.4m Vertical: 0.8m
RTK Accuracy	Horizontal: 0.8cm+1ppm Vertical: 1.5cm+1ppm
Timing Accuracy (RMS)	20 ns
Velocity Accuracy (RMS)	0.03 m/s
Channels	1408
Time to First Fix	Cold Start＜30s
Initialization Time	＜5s (Typical)
Initialization Reliability	＞99.9%
Data	Data Refresh Rate: 50Hz Positioning Differential Data: RTCM 3.X Data Format: NMEA-0183, Unicore

LNA Gain	23±2dB
Noise Figure	≤2dB
Output VSWR	≤2
Passband Ripple	±2dB

Dimensions	Φ46*H19.2mm (Shield cover and connectors not included)
Connector	GH1.25-6P
Weight	≤15g
Mounting	4 x M1.6 Screws
Interface Pin Order	1：GND 2：TX1 3：RX1 4：RX2 5：TX2 6：VCC