Unicorecomm Ub482 All Constellation Multi Frequency High Precision Heading Board User Manual

INSTALLATION AND OPERATION
USER MANUAL

UB482
GPS/BDS/GLONASS/Galileo
All-constellation Multi-frequency
High Precision Heading Board
WWW.UNICORECOMM.COM

Revision History

Disclaimer
Information in this document is subject to change without notice and does not represent a commitment on the part of Unicore Communications, Inc. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose without the express written permission of a duly authorized representative of Unicore Communications, Inc. The information contained within this manual is believed to be true and correct at the time of publication.
© Copyright 2009-2021 Unicore Communications, Inc. All rights RSV.

Foreword
This <User Manual> provides information in the features of the hardware, the installation, specification and use of UNICORECOMM UB482 product.
This manual is a generic version. Please refer to the appropriate part of the manual according to your purchased product configuration, concerning CORS, RTK and Heading.
Readers it applies to
This <User Manual> is applied to the technicists who know GNSS Receiver to some extent but not to the general readers.

Overview

UB482 is a classic compact high-precision board developed by Unicore Communications, Inc., targeting precision agriculture, robots and intelligent driving applications. It supports all-constellation multi-frequency RTK and heading function.
The UB482 can provide reliable centimeter-level accuracy and high accuracy heading output at high update rate.
By employing a single UC4C0 (432 channel tracking) baseband chip and a single RF chip, using single-sided SMD packaging, UB482 has achieved very small size (30x40mm). It can simultaneously track GPS L1/L2 + BDS B1I/B2I + GLONASS L1/L2+Galileo E1/E5b+QZSS.
The UB482 adopts UNICORECOMM’s new-generation “UGypsophila” RTK processing technology and takes advantage of the high-performance data sharing capability and super-simplified operating system within the NebulasII GNSS SoC chip. It uses optimized multi-dimensional RTK matrix pipeline computation, resulting in much higher RTK processing capability.

1.1 Key Features

➢ All-constellation multi-frequency high-precision RTK and heading board, support BDS B1I/B2I + GPSL1/L2+GLONASS L1/L2+Galileo E1/E5b+QZSS L1/L2
➢ 46x71mm classic compact board
➢ Precise RTK positioning and heading
➢ Fast RTK Initialization time < 5s
➢ 20Hz data output rate
➢ Adaptive recognition of RTCM input data format
➢ Support LAN
➢ Support odometer input and external high-performance IMU interface*

1.2 Technical Specifications
Table 1-1 Performance Specifications

Functional Ports

1.3 Board Overview

• RF Part
  The receiver gets filtered and enhanced GNSS signal from the antenna via a coaxial cable. The RF part converts the RF input signals into the IF signal, and converts IF analog signal into digital signals required for NebulasII (UC4C0) digital processing.
   NebulasII SoC (UC4C0)
  The UB482 incorporates the processing from the NebulasII (UC4C0), UNICORECOMM’s new generation high precision GNSS SoC with 55nm low power design, which supports up to 12 digital intermediate frequency or 8 analog intermediate frequency signals and can track 12 navigation signals with 432 channels.
• 1PPS
  UB482 outputs 1 Pulse-per-second time strobe with corresponding time and positioning tag. The pulse width/polarity is configurable.
• Event
  UB482 provides 1 Event Mark Input with adjustable pulse width and polarity.
• Reset (RESETIN_N)/Factory Default (FRESET_N)
  The reset signal RESETIN_N should be set active low, no less than 5ms effective time.
  When the FRESETN_N is activated, the user parameter in NVM will be cleared and the board is restored to factory default settings. The FRESET_N is active low. Please pull FRESET_N pin to low level for more than 5s to ensure successful reset.

Hardware

2.1 Dimensions
Table 2-1 Dimensions

ANT1 is the primary antenna (positioning) and ANT2 is the secondary antenna (heading). The antenna is MMCX connector. When working as a base station, only ANT1 should be connected. When working as a rover, the direction output is the result of the anticlockwise angle between the vector (starting from ANT1, ending at ANT2) and True North.

2.2 Connector and Pin Definition
There are two dual rows of pin headers on UB482: 2×14 dual row, 2.0mm pitch

Note: The model number of the dual row pin header (28pin male) on the UB482 board is: CH71283V100 from CviLux. It’s recommended to mate with the Molex’s plug-in socket (28Pin female), of which the model number is: 79107-7013.

2.3 Pins Function Description
Table 2-2 Pins Function

2.4 Electrical Specifications
Table 2-3 Absolute Maximum Rating

2.5 Operational Conditions
Table 2-4 Operational Conditions

2 Since the product has capacitors inside, inrush current will occur during power-on. Evaluate in the actual
environment in order to check the effect of the supply voltage drop due to the inrush current.

2.6 Physical Specifications
Table 2-5 Physical Specifications

Hardware Design

3.1 Design in Considerations

• The module’s VCC should be monotonic when powered on, the initial level should be lower than 0.4V, and the undershoot and ringing should be guaranteed to be within 5% VCC
• ANT1 and ANT2 MMCX interfaces supply DC 4.8~5.4 V feed in no-load condition, and supply DC 4.6V±0.2V feed when the working circuit is 30~100mA tested in room temperature. Fifty (50) ohm impedance matching for ANT1 and ANT2 is strongly recommended
• Supply stable power to the VCC pin. Connect all the GND pins to ground
• Ensure COM1 is connected to the host. COM1 is required for firmware upgrades.
• FRESET_N resets the factory settings for the board. RESETIN is fast reset; please ensure the board is connected correctly to reset the board.

In order to obtain proper performance, special concerns should be paid during the design to the following:

• Power supply: A stable and low ripple power supply is necessary for good performance. Make sure the peak to peak voltage ripple does not exceed 50mVpp. It is recommended to use a power chip with current output capacity greater than 2A to power the board.
  − Use LDO to ensure the purity of the power supply
  − Try to place LDO close to the module in layout
  − Widen the tracks of power circuit or use copper pour surface to transmit current
  − Avoid walking through any high-power or high inductance devices such as a magnetic coil
• Interfaces: Ensure that the signals and baud rate of the main equipment match those of the UB482 board
• Antenna interface: Make sure the antenna impedance matches, and the cable is short without any kinks, try to avoid acute angles
• Try to avoid designing in any circuits underneath UB482
• Keep the board away from any high temperature air flow as far as possible

3.2 UB482 Reference Design
The reference design of UB482 LAN is as follow:

Note:
R2, R4, R6 and R7 are reserved for impedance matching. Generally, no soldering is required.

3.3 Pins

3.4 Antenna
The ANT1 and ANT2 MMCX are connected to active antennas directly and supply feed for the antenna. When the antenna interfaces of ANT1 and ANT2 connect no antennas, which means there is no load, the voltage tested by multimeter is DC 4.8~5.4 V; When the RF interface of the module connects an antenna and the working circuit is tested as 30~100 mA in room temperature, the voltage is DC 4.6V±0.2V. Fifty (50) ohm impedance matching for ANT1 and ANT2 is strongly recommended when the active antenna is connected.

Installation and Configuration

4.1 ESD Handling Precautions
UB482 Board is an ESD sensitive device and special precautions when handling are
required.

• Electrostatic discharge may cause damages to the device. All operations mentioned in this chapter should be carried out on an antistatic workbench,
  wearing an antistatic wrist strap and using a conductive foam pad
• Hold the edge of the board, and do NOT directly touch the electronic components

4.2 Installation Guide
The user may assemble UB482 flexibly according to the application scenarios and market needs. The following figure shows a typical installation of the UB482 using the Evaluation Kit (EVK).

Please inspect the shipping cartons for any signs of damage or mishandling before unpacking the UB482 package. The following items are required to install the UB482 board correctly:

1. UB482 EVK suite (or evaluation board)
2. User manual
3. UPrecise software
4. Qualified antenna
5.  MMCX antenna cable
6. A PC or laptop with serial ports (Win7 and above), with UPrecise installed

Follow the steps below to install:
➢ Step 1: Fix UB482 board on the EVK with the holes and pins accurately.
➢ Step 2: Choose the correct location for the antenna—this is critical for a highquality installation. Poor or incorrect placement of the antenna can influence accuracy and reliability and may result in damage during normal operation. Use the coaxial radio frequency cable to connect the antenna connector of   B482 EVK;

Note:
The RF connector on the board is MMCX, and the suitable connecting wire should be selected according to the package. The input signal gain at the antenna interface is optimal between 20 and 36dB. Please select the appropriate antenna, antenna cable and online LNA accordingly.

➢ Step 3: Connect the PC to the EVK serial port through direct serial cable;
➢ Step 4: Connect a 12V adapter to the EVK power input, and switch on the EVK;

➢ Step 5: Open the UPrecise software on the PC;
➢ Step 6: Configure the receiver through UPrecise software to send commands or log data.

4.3 Power On
UB482 power supply voltage is 3.3V. After power-on, the receiver starts and can establish communication quickly.

4.4 Configuration and Output
UNICORECOMM UPrecise software provides graphical interface to control and display the operation of the receiver. The features of UPrecise software include:

• Connecting and configuration of the receiver
• Constellation View: Graphic window to display Position of satellite, PRN, and Signal/Noise Ratio
• Trajectory View: The trajectory view for displaying the present point and the past point of the Receiver
• Logging Control View: Graphic interface for data logging
• Console View: Console window for sending command to the receiver
• Upgrading the firmware
• TTFF test

4.4.1 Operation Steps

1. Turn on the EVK. Click “file – > connect”. Set the baud rate: the default baud rate is 115200 bps
2. Click the “receiver settings” button to configure the NMEA message output
3. Click “send” button. It is recommended to configure GPGGA, GPGSV, and other messages. Or in the dialog window, click on “Send all Message” to complete all the NMEA message output (default update rate 1Hz).
4. In the data session window right click to adjust output log font size, to stop / resume log output, or to clear log content
5. Configure or type commands using the UPrecise view.

LED Indicators

LED indicators are installed on UB482 board to indicate the basic working status of the board, which includes:

The LED indicators are shown in the following figure:

Configuration Commands

UB482 supports abbreviated ASCII format. All commands are composed of a log heading and configuration parameters.
Common instructions are shown in the following table:

Table 6-1 Common Instructions

6.1 Reference Station Configuration
The RTK base station is static with a fixed and known position. The common instructions to set up an RTK base station configuration are:
1) If the precise coordinates are known, the precise coordinates could be set as in this example:
Table 6-2 Base Station Mode

2) Self-Optimizing Base Station Mode: If there are no precise coordinates already available, select auto-fix option and the receiver will work for a certain period, and will then use the derived value as the base station coordinates. The most usual instructions are as follow:
Table 6-3 Self-Optimizing Base Station Mode

6.2 Rover Station Configuration
The RTK rover receives the differential correction data from the base station and synchronously receives satellite signals to process an RTK solution, and finally RTK high precision heading becomes available. Common instructions to set up the rover stations are as follows:

MODE ROVER
GNGGA 1
SAVECONFIG

6.3 Moving Base Configuration
Different from RTK base station which has a fixed position, the moving base station is in motion and sends differential correction data to the receiver of the rover station.
UB482 can adaptively recognize RTCM data input interface and format. Frequently used instructions to set up the moving base stations are as follows:
Table 6-4 Moving Base Station Mode

6.4 Heading Configuration
This command is used for dual-antenna receivers (UB482, UM482, and UM442). The heading result is the angle from True North to the baseline of the ANT1 to ANT2 in a clockwise direction. The heading function is enabled by default settings. See Figure 6- 1 Heading Schematic for the schematic.
Frequently used commands are as follows:
GPHDT 1
SAVECONFIG

6.5 Heading2 Configuration
The heading2 result is the angle from True North to the baseline of the base to rover in a clockwise direction. Dual-antenna heading receiver (UB482, UM482, UM442) supports heading2. The heading2 for the dual-antenna receiver is the angle from True North to the baseline of the Base to ANT1 in a clockwise direction. Please refer to figure 6-1 for the detailed schematic.
Frequently used commands are as follows:
MODE HEADING2
GPHDT2 ONCHANGED
SAVECONFIG

Firmware Upgrade

Upgrading UB482 could be done using the UPrecise software: Click “…” to browse the firmware update package, and click “Start” button to start the firmware upgrading process (don’t select “Reset” checkbox): In general, the upgrade time is within 5minutes.
Note: Please use COM1 for firmware upgrade

Packaging

There are 100pcs UB482 boards inside the package box.

Unicore Communications, Inc.
F3, No.7, Fengxian East Road, Haidian, Beijing, P.R.China,
100094
www.unicorecomm.com
Phone: 86-10-69939800
Fax: 86-10-69939888
[email protected]

References

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