M21 RTK with IMU GNSS Raspberry PI HAT

M21 Deeply coupled IMU All-constellation Multi-frequency High Precision RTK GNSS receiver.

M21 is Bynav new-generation proprietary high-precision RTK positioning module based on the Alice 22nm high performance automotive SoC, designed on the basis of ISO26262 ASIL B functional safety. The module supports GPS L1C/A/L1C/L2/L5, BDS B1l/B2l/B3l/B1C/B2a/B2b, GLONASS G1/G2, Galileo E1/E5a/E5b/E6, QZSS L1/L2/L5/L6(CLAS), NavIC L5, SBAS L1C/A and L-band. The built-in anti-interference and anti-deception technologies enhances RTK calculation on multiple modes and frequencies, which significantly improves RTK initialization time, measurement accuracy and reliability in complex environments such as satellite signal interference and loss. Relying on the excellent performance, M21 is well suited for autonomous driving, lane-level navigation, drones and robots.

HAT features:

• Raspberry PI 40 pin extension header, supports all Raspberry PI compatible boards and Jetson Nano
• USB C connector
• Antenna input with IPEX connector
• On board low noise 3.3 V voltage regulator
• On board voltage level translators for 5V compatibility
• Time pulse LED, Power LED, RTK LED and GEO LED
• BY_Connect Evaluation Software
• Extensive visualization and evaluation features
• Backup supercapacitor
• Supports onboard battery holder for ML1220 rechargeable cell for long backup applications
• Dimensions 65x30.5x10 mm
• Fully assembled and ready to use
• ELT_RTKBase User Guide

M21 module features:

• Based on the new generation GNSS SoC - Alice, designed on the basis of ISO26262 ASIL B functional safety
• 17.0 x 22.0 x 2.75 mm LGA package
• Full-temperature calibrated high-precision IMU and deeply coupled combined navigation engine
• Supports on-chip RTK positioning calculation on all systems and multiple frequencies
• Supports GPS L1C/A/L1C/L2P(Y)/L2C/L5, BDS B1I/B2I/B3I/B1C/B2a/B2b, GLONASS G1/G2/G3, Galileo E1/E5a/E5b/E6, QZSS L1C/A/L1C/L2C/L5, NavIC L5 and SBAS L1C/A
• All-system multi-frequency RTK engine and advanced RTK technology
• Independent tracking of different frequencies and 60dB narrowband anti-jamming technology

Performance Specifications:

• Channels: 1507 channels, based on Alice

Frequency

• GPS L1C/A/L1C*/L2/L5
• BDS B1I/B2I/B3I/B1C*/B2a/B2b*
• GLONASS G1/G2
• Galileo E1/E5a/E5b/E6*
• QZSS L1/L2/L5/L6(CLAS*)
• NavIC L5
• SBAS* L1C/A

Single point positioning (RMS):

• Horizontal: 1.5 m
• Vertical: 2.5 m
• Data Update Rate 50 Hz Positioning

RTK (RMS):

• Horizontal: 1 cm + 1 ppm
• Initialization Reliability > 99.9%
• Vertical: 1.5 cm + 1 ppm
• Data Update Rate 2 Hz Positioning, 100Hz INS

Sensitivity:

• Acquisition: -146 dBm
• Re-acquisition: -156dBm
• Tracking: -156 dBm
• L-band: -133 dBm
• L-band BER: 10E-5

Accuracy:

• Carrier phase: <1mm (RMS)
• Pseudorange: <0.1m (RMS)
• Tracking: -156 dBm
• Time Accuracy(RMS): <20 ns
• Speed measurement: 0.03 m/s (RMS)
• Dead reckoning accuracy, typical: 0.8%

Anti-jamming protection:

• Jamming to signal ratio: 65dBc
• Multitone jamming: 6 or more pulses
• Narrowband jamming: 10% of the signal bandwidth
• Fast sweep jamming protection

Physical Characteristics:

• Packaging: 54 pin LGA
• Dimension: 17.0 × 22.0 × 2.75 mm
• Weight: 1.88 ± 0.03 g

Environmental Specifications:

• Working temperature: -40 °C ~ +105 °C
• Storage temperature: -55 °C ~ +150 °C
• Humidity: 95% No condensation
• Vibration: MIL-STD-810F
• Shock: MIL-STD-810F

Communication Interfaces:

• 3 × UART (LVTTL)
• 2 × CANFD (shared with UART0, UART1)
• 1 × SPI (shared with UART2 and RMII)
• 1 × RMII 100Mbit (shared with UART2 and SPI)

Note: Items marked with * are only supported by specific firmware.

Board can be used for a Base or Rover operation mode!

• Antenna for RTK BASE station which perfectly suitable with this module.
• Ultra Light Helix Antenna for drone

• M20 Product Summary
• M21 M22 Datasheet
• Bynav Interface Protocol
• BY_Connect Evaluation Software
• BY Connect User Manual