iChidori-Crest¶

iChidori-Crest is a compact Raspberry Pi HAT designed for high-precision GNSS positioning and embedded applications. It integrates a Septentrio mosaic-G5 GNSS receiver module with an mPCIe interface for an LTE modem, onboard power management, SD card logging, and additional connectivity and expansion interfaces.

Designed for Raspberry Pi 4/5, iChidori-Crest provides a flexible hardware platform for RTK positioning, remote monitoring, and GNSS-based applications. It is available in variants — P1, P3, P3H, and P6 — sharing the same board hardware while offering different GNSS receiver capabilities.

iChidori-Crest Board

Powered by the Next-Generation Septentrio mosaic-G5¶

At the heart of iChidori-Crest is the Septentrio mosaic-G5, a new generation of ultra-compact, high-performance GNSS receiver modules. Combining multi-constellation, multi-frequency satellite tracking with centimeter-level RTK positioning, mosaic-G5 brings advanced positioning capabilities to space- and power-constrained systems.

Compared with the mosaic-X5, mosaic-G5 offers a 60% smaller module footprint and 40% lower power consumption, while maintaining high-precision positioning performance. Depending on the receiver variant, the series supports tracking of up to four frequencies, output rates of up to 100 Hz, and AIM+ Premium, advanced GNSS+ algorithms for enhanced resilience against interference and spoofing.

These capabilities make mosaic-G5 well suited for compact RTK systems, robotics, autonomous platforms, and other applications where positioning performance, reliability, size, and power efficiency are critical.

What's on the Board¶

Component	Description
GNSS Module	Septentrio mosaic-G5 — multi-constellation, multi-frequency GNSS receiver
Antenna Connectors	Main and auxiliary MMCX antenna connections
LTE mPCIe Slot	PCI Express Mini Card slot for an LTE modem, with an onboard nano-SIM socket
MicroSD Card Slot	On-board microSD slot for GNSS data logging
40-Pin GPIO Header	Standard Raspberry Pi HAT connector — fits Raspberry Pi 4 and 5
Power Supply	USB-C 5V, External VIN 6–24V, or Pi 5V rail