unicorecomm UM482 High Precision GNSS Module User Manual

unicorecomm UM482 High Precision GNSS Module

Product Information

This user manual provides information on the features, installation, specifications, and use of the UNICORECOMM UM482 product. The UM482 is a high- precision positioning and heading module that supports GPS L1/L2+BDS B1I/B2I+GLONASS L1/L2+Galileo E1/E5b and QZSS L1/L2 constellations. It has a dual antenna input with supporting antenna signal detection, 20Hz data output rate, and adaptive recognition of RTCM input data format.

Technical Specifications

Galileo E1/E5b QZSS
L1/L2| Horizontal: 1.5m Vertical: 2.5m| Horizontal: 0.4m Vertical: 0.8m| Horizontal: 1cm+1ppm Vertical: 1.5cm+1ppm

Installation and Operation
Before installing the UM482 module, please refer to the appropriate part of this manual depending on your purchased product configuration, concerning CORS, RTK, and Heading. The installation and configuration process is described in detail in Chapter 4 of the manual.

Usage Instructions

The UM482 module supports precise RTK positioning and heading. It has a fast RTK initialization time of fewer than 5 seconds. The module has a dual antenna input, and it is recommended to use high-performance antennas for accurate positioning. The module can also support odometer input and external high- performance IMU interface if required. To configure the module, refer to Chapter 5 of the manual which lists the configuration commands. Additionally, Chapter 6 describes the antenna detection process, Chapter 7 describes firmware upgrades, and Chapter 8 provides soldering recommendations.

Revision History

time

Add the related description to clarify the VCC restrictions

| 2019-08-26
R3.2| Chapter 2.1: delete the legacy parameter and add pin mechanical spec

Chapter 2.2: add the working current info of No.17 pin

| 2019-10-14
R3.3| 1.2 Technical Specifications: update the weight value from 8.8 to 9.2

1 Overview: update the product diagram

| 2020-02-26
R3.4| 1.2 Technical Specifications: add QZSS| 2020-07-01
R3.5| Update BDS frequencies in section 1.2| 2020-10-21
R3.6| Add external antenna feed reference design| 2020-12-17
R4| Remove information on the MEMS device and add RF

input power consumption of the antenna

| 2021-04-13
R4.1| Modify pin definition in Figure 2-2| 2021-06-30
R4.2| Update Figure 3-4 and fix typo| 2021-07-06

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 offers you information on the features of the hardware, the installation, specifications and use of the UNICORECOMM UM482 product.

For the generic version of this manual, please refer to the appropriate part of this manual depending on your purchased product configuration – concerning CORS, RTK and Heading.

Readers it applies to
This is written for technologists who have knowledge of GNSS Receivers to some extent – it is not for general readers.

Overview

UM482 is the smallest, all-constellation, multi-frequency, high-precision RTK and heading module developed by Unicore Communications Inc. The module is targeted for use in robots, UAVs and intelligent driving applications.

The UM482 provides reliable centimeter-level accuracy and a high-accuracy heading output at high update rates. By employing a single UC4C0 (432 channel tracking) baseband chip with an internal RF front-end in a single-sided SMD package, UM482 can achieve very small size (30×40 mm). It can simultaneously track GPS L1/L2 + BDS B1I/B2I + GLONASS L1/L2+Galileo E1/E5b+QZSS.
The UM482 adopts UNICORECOMM’s new-generation “UGypsophila” RTK processing technology and takes advantage of the high-performance data-sharing capability and the extremely 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.

Key Features

• 30×40 mm, small footprint multi-frequency RTK and heading module, SMD package
• Supports GPS L1/L2+BDS B1I/B2I +GLONASS L1/ L2+Galileo E1/E5b and QZSS L1/L2
• Precise RTK positioning and heading
• RTK Initialization time < 5s
• Dual antenna input with supporting antenna signal detection
• 20Hz data output rate
• Adaptive recognition of RTCM input data format
• May also support odometer input and external high-performance IMU interface*

Specifications

Performance Specifications

Channels| 432 channels, based on

NebulasII SoC chip

| Cold Start| ＜25s
---|---|---|---

Frequency

| GPS L1/L2

BDS B1I/B2I1 GLONASS L1/L2

Galileo E1/E5b

QZSS L1/L2

| ****

RTK Initialization Time

| ****

＜5s (typical)

Single Point

Positioning (RMS)

| Horizontal: 1.5m Vertical: 2.5m| Initialization Reliability| ＞99.9%

DGPS (RMS)

| ****

Horizontal: 0.4m Vertical: 0.8m

| Differential Data| RTCM 3.0/3.2/3.3
Data Formats| NMEA-0183，

Unicore Binary

RTK (RMS)

| Horizontal: 1cm+1ppm Vertical: 1.5cm+1ppm| Update Rate| 20Hz
Time accuracy

(RMS)

| 20ns
Heading Accuracy

(RMS)

| 0.2 degree/1m baseline| Data Accuracy

(RMS)

| 0.03m/s
Size| 30×40×4 mm| Power Consumption| 2.4W (Typical)
Weight| 9.2g| |

Functional Ports

Interfaces

• RF Part
  GNSS signals received from the antenna via a coaxial cable are filtered and enhanced. The RF part converts the RF input signals into the IF signal, and then IF analog signals are converted into the digital signals required for NebulasII digital processing.

• NebulasII SoC (UC4C0)
  The UM482 incorporates the processing from the NebulasII (UC4C0), UNICORECOMM’s a new generation high precision GNSS SoC using 55nm low power design. It supports up to 12 digital intermediate frequencies or 8 analog intermediate frequency signals and can track 12 navigation signals with 432 channels.

• 1PPS
  UM482 outputs a 1 Pulse-per-second time strobe with a corresponding time and positioning tag. The pulse width/polarity is configurable.

• Event
  UM482 provides a 1 Event Mark Input with adjustable pulse width and polarity.

• Reset (RST_N)/Factory Default (FRESET_N)
  The reset signal RST_N should be set active low for no less than 20ms effective time.

When the FRESET_N is activated, the user parameters in NVM will be cleared and the module is restored to factory default settings. The FRESET_N is active low. Please pull FRESET_N pin to low for more than 5s to ensure a successful reset.

Hardware

Dimensions

Pin Definition (Top View)
The UM482 has 2×30 pins, shown below.

Pin Function

ANT1_PWR

| ****

I

| GNSS antenna power supply (for separate heading

antennae)

6| GND| –| Ground

7

| ****

ANT_NLOD

| ****

O

| Primary GNSS antenna open circuit indicator 1: normal

0: antenna is open circuit

8

| ****

ANT_FFLG

| ****

O

| Primary GNSS antenna short circuit indicator 1: normal

0: antenna is short circuit

9| GND| –| Ground
10| RSV| –| RSV
11| RSV| –| RSV
12| RSV| –| RSV
13| RSV| –| RSV
14| GND| –| Ground
15| SPEED| I| odometer- pulse (reserved)
16| FWR| I| odometer- direction (reserved)

17

| ****

V_BACKUP

| ****

I

| When the main power supply of the module VCC is cut off, V_BCKP enables a separate power supply if provisioned to RTC and SRAM. Level requirements: 2.0~ 3.6 V, and the working current is about 10uA.

Leave it open without using the hot start function

18| GND| –| Ground

19

| ****

PVT STAT

| ****

O

| PVT positioning indicator, active-high. The module outputs high level when positioning is available and

outputs low level when no positioning is proceeded.

20| GPIO2| I/O| General IO
21| RSV| –| RSV
22| ****

FRESET_N

| ****

I

| Reset to factory default (clear all user settings),

LVTTL active-low, activate for longer than 5 seconds

23

| ****

ERR_STAT

| ****

O

| Abnormal indicator, active-high. When the module self-diagnosis system fails, it outputs high level. Following completion of successful self-test ERR-STAT

outputs low level

24

| ****

RTK_STAT

| ****

O

| RTK positioning indicator, active-high. When the RTK solution is fixed, it outputs high level, alternatively it outputs low level when in other positioning states or

no positioning is proceeded.

25| GND| –| Ground
No| Pin| I/O| Description
---|---|---|---
26| SPI_MISO| I| SPI data master input slave output
27| SPI_MOSI| O| SPI data master output slave input
28| SPI_CLK| O| SPI clock
29| SPI_SS0| O| SPI chip select 0
30| SPI_SS1| O| SPI chip select 1
31| 3.3V_VCC| Power| Power Supply (+3.3V)
32| 3.3V_VCC| Power| Power Supply (+3.3V)
33| GND| –| Ground
34| GND| –| Ground
35| TXD1| O| COM 1 transmit
36| RXD1| I| COM 1 receive
37| TXD2| O| COM 2 transmit
38| RXD2| I| COM 2 receive
39| TXD3| O| COM 3 transmit
40| RXD3| I| COM 3 receive
41| I2C_SDA| I/O| I2C data
42| I2C_SCL| I/O| I2C clock
43| GND| –| Ground
44| PPS| O| 1 Pulse per second
45| EVENT| I| Event Mark
46| ****

RST_N

| ****

I

| Fast reset, will not clear user configurations. Active

Low

47| GND| –| Ground
48| RSV| –| RSV
49| RSV| –| RSV
50| RSV| –| RSV
51| RSV| –| RSV
52| GND| –| Ground

53

| ****

ANT2_FFLG

| ****

O

| Secondary GNSS antenna short circuit indicator 1: normal

0: antenna is short circuit

54

| ****

ANT2_NLOD

| ****

O

| Secondary GNSS antenna open circuit indicator 1: normal

0: antenna is open circuit

55| GND| –| Ground
56| ANT2_PWR| I| Secondary GNSS antenna power supply
57| GND| –| Ground
58| GND| –| Ground
59| ANT2_IN| I| Secondary GNSS antenna signal (for Heading antenna)
60| GND| –| Ground

Electrical Specifications

Absolute Maximum Ratings

Primary GNSS Antenna Power

Supply

| ANT1_PWR| -0.3| 6| V
Primary GNSS Antenna Signal Input| ANT1_IN| -0.3| ANT1_PWR| V
Secondary GNSS Antenna Power

Supply

| ANT2_PWR| -0.3| 6| V
Secondary GNSS Antenna Signal

Input

| ANT2_IN| -0.3| ANT2_PWR| V
RF Input Power Consumption of

Primary antenna

| ANT1_IN input power| | +15| dBm
RF Input Power Consumption of

Secondary antenna

| ANT2_IN input power| | +15| dBm
VCC Ripple (Rated Max.)| Vrpp| 0| 50| mV
Voltage Input (pins other than

RXD1, RXD2, RXD3)

| Vin| -0.3| 3.6| V
Maximum ESD stress| VESD(HBM)| | ±2000| V

Operational Conditions

Inrush current* (impulse

current during power-up)

| ****

Iccp

| | | ****

8.8

| ****

A

| ****

Vcc = 3.3 V

LOW-Level Input Voltage

| ****

Vin_low_1

| ****

-0.3

| | VCC*

0.3

| ****

V

|

High-Level Input Voltage

| ****

Vin_high_1

| VCC*

0.7

| | VCC+

0.3

| ****

V

|
LOW-Level Output Voltage| Vout_low| 0| | 0.45| V| Iout= 4 mA

High-Level Output Voltage

| ****

Vout_high

| VCC-

0.45

| | ****

VCC

| ****

V

| ****

Iout =4 mA

Antenna Gain| Gant| 20| 30| 36| dB|
Noise Figure| Nftot| 2.5| 3| 3.5| dB|
Primary GNSS Antenna

Power Supply

| ****

ANT1_PWR

| ****

3.3

| ****

5

| ****

5.5

| ****

V

| ****

< 100mA

Secondary GNSS Antenna| ANT1_PWR| 3.3| 5| 5.5| V| < 100mA
Item| Pin| Min| Typical| Max| Unit| Condition
---|---|---|---|---|---|---
Power Supply| | | | | |
Operating Temperature| Topr| -40| | 85| °C|
Power Consumption| P| | 2.0| | W|

NOTE:
Since the product contains capacitors at the input, 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.

Physical Specifications

Storage: -55℃～+95℃
Humidity| 95% No condensation
Vibration| GJB150.16-2009, MIL-STD-810
Shock| GJB150.18-2009, MIL-STD-810

Hardware Design

Design in Considerations

• Supply stable power to the VCC pin. Connect all the GND pins to ground
• 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 +3.3~5.5 V feed. Fifty (50) ohm impedance matching for ANT1 and ANT2 is strongly recommended
• Ensure COM1 is connected to the host. COM1 is required for firmware upgrades.
• Only connect the module’s reset pin FRESET_N to ensure complete reset of the module. It will restore the module to the manufacturing configuration.
• When ANT_NLOD, ANT_FFLG and antenna detection indication signal are connected, the IO of the client MCU terminal should be set as input and without any pull-up/down.

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 the layout
  • Widen the tracks of power circuit or use a 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 UM482 module
• Antenna interface: Make sure the antenna impedance matches and the cable is short without any kinks, try to avoid all acute angles
• Try to avoid designing in any circuits underneath UM482

This module is a temperature-sensitive device, so dramatic changes in temperature will result in reduced performance. Keep it away as far as possible from any high-power high-temperature air and heating devices

UM482 Reference Design

Pins

Pin Sequence

| Pin Name| Pin| I/O| Description| Integration Notes
---|---|---|---|---|---
| ****

VCC

| ****

31, 32

| ****

power

| ****

Voltage Supply

| Stable, clean, low ripple power supply – peak ripple power lower than 50mV is preferred
Power Supply| ANT1_PWR ANT2_PWR| 5, 46| power| Antenna Power Supply| Voltage supply for active antenna
| 1, 3, 4,

6, 9, 14,

| | |
| ****

GND

| 18, 25,

33, 34,

43, 47,

52, 55,

| ****

power

| ****

Ground

| Connect all the GND signals to ground. Better to use copper pour surface.
| | 57, 58,| | |
| | 60| | |
| Pin Name| Pin| I/O| Description| Integration Notes
---|---|---|---|---|---

Antenna

| ANT1_IN, ANT2_IN| ****

2, 59

| I| Satellite

signal input

| ****

50 Ω impedance matching

UART

| ****

TXD1

| ****

35

| ****

I

| COM1

Transmit

Data

| COM1 output, leave unconnected if not used
RXD1| 36| O| COM1

Receive Data

| COM1 input, leave unconnected if not used
TXD2| ****

37

| ****

I

| COM2

Transmit

Data

| COM2 output, leave unconnected if not used

RXD2

| ****

38

| ****

O

| COM2

Receive Data

| COM2 input, leave unconnected if not used

TXD3

| ****

39

| ****

I

| COM3

Transmit Data

| ****

COM3 output, leave unconnected if not used

RXD3| 40| O| COM3

Receive Data

| COM3 input, leave unconnected if not used

System

| ****

FRESET_N

| ****

22

| ****

I

| Hardware Reset (low effective)| FRESET_N requires more than 5s to reset the module to factory default.

Don’t connect it if not used

PPS| 44| O| PPS signal|
EVENT| 45| I| EVENT signal|

PCB Packaging

Reset Signal
If the user resets the module via the RST_N pin after power on, the pin should be used correctly in order for the UM482 module to perform normally. The RST_N and power supply must meet the following timing sequence requirement. The RST_N reset signal should last more than 5ms to be effective.

External Antenna Feed Design
UM482 feeds the antenna signals to the required circuits internally, but in order to effectively prevent damage from lightning and surges, circuit protection should be installed externally to protect the module. High voltage and high-power protection chips should be used to feed the antenna from the outside of the module. Gas discharge tube, varistor, TVS tube and other high- power protective devices may be used in the antenna circuit to effectively improve the prevention against lightning stroke and surge.

Remarks:

• L1 and L2, feed inductor, 68nH RF inductor in 0603 package is recommended
• C1 and C3, decoupling capacitor, it is recommended to connect two capacitors of 100nF/100pF in parallel;
• C2 and C4, DC blocking capacitor, recommended 100pF capacitor.

Installation and Configuration

ESD Handling Precautions
UM482 Module 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 module, and do NOT directly touch the electronic components

The users may assemble UM482 flexibly according to the following application scenarios. The following figure shows a typical installation of the UM482 with Evaluation Kit (EVK).

Hardware Installation

Please inspect the shipping cartons for any signs of damage or mishandling before unpacking the UM482 package. The following items are required to install the UM482 correctly:

• UM482 EVK suite (or evaluation board)
• User manual
• UPrecise software
• Qualified antenna
• MMCX antenna cable
• PC or laptop with serial ports (Windows 7 or above), with UPrecise installed

Follow the steps below to install:

• Step 1: Fix UM482 board on the EVK with the holes and pins aligned accurately.

• Step 2: Choose the correct location for the antenna- this is critical for a high-quality 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 UM482 EVK;
  NOTE:
  The RF connector on the board is MMCX – the suitable connecting wire should be selected according to the package. The input signal gain at the antenna interface is optimally between 20 and 36 dB. Please select the appropriate antenna, antenna cable and online LNA accordingly.

• Step 3: Connect the PC to the EVK serial port through the 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 to log data.

Power On
The UM482 power supply is 3.3V DC. Connect the corresponding serial ports and GNSS antenna before power up. After power-on, the receiver starts and can quickly establish communication. It also provides special testing tools for module testing.

Configuration and Output
UNICORECOMM UPrecise software provides a 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 the Position of satellite, PRN, and Signal/Noise Ratio
• Trajectory View: The trajectory view for displaying the present point and the last point of the Receiver
• Logging Control View: Graphic interface for data logging
• Console View: Console window for sending commands to the receiver
• Upgrading the firmware
• TTFF test

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 first configure GPGGA, GPGSV, and other statements. 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 this UPrecise view.
6. Use various views of UPrecise to configure or input commands as required.

Configuration Commands

UM482 supports abbreviated ASCII format. All commands are composed of a log heading and configuration parameters.

Common instructions are shown in the following table:

freset

| Reset to factory settings.

Note: the factory set baud rate is 115200 bps.

version| Query the hardware version, firmware version of receivers
config| Current configuration of each port of the receiver

mask BDS

| Mask (disable) tracking of Beidou satellite system. BDS, GPS,

GLONASS and Galileo can be disabled separately

unmask BDS

| Unmask (enable) tracking of Beidou satellite system. BDS, GPS, GLONASS and Galileo can be enabled separately.

By default, all satellite systems are enabled.

config com1 115200

| Set the baud rate of com1 to 115200. Baud rates of com1, com2

and com3 can be set to any of the following: 9600, 19200, 38400, 57600, 115200, 230400,460800

unlog| Disable all output of the current serial port
saveconfig| Save configuration to NVM (nonvolatile memory)

mode base time 60 1.5 2.5

| Derive an average coordinate after 60 seconds, or after a “better than 1.5 meter horizontal and less than 2.5 meter vertical

accuracy” is achieved within 60 seconds.

When restarting after power off, the calculations will repeat and a new coordinate will be generated.

mode base lat Lon height

| Mode base lat Lon height:

Manually configure the coordinate: lat, lon, height Example:

lat=40.07898324818, lon=116.23660197714,

height=60.4265

Note: The latitude and longitude coordinates can be obtained through the command best pos. Lat or lon Negative means the location is in the southern hemisphere or in the western

hemisphere

mode base| Config as base station
mode movingbase| Config as moving base
mode rover| Config as rover (default mode)
Command| Description
---|---
rtcm1033 comx 10

rtcm1006 comx 10

rtcm1074 comx 1

rtcm1124 comx 1

rtcm1084 comx 1

rtcm1094 comx 1

| Set COMX, ICOMX, NCOMX to send differential message under base station mode. COMX could be either com1, com2, or com3.
NMEA0183 Output Message

gpgga comx 1

| Output GGA in 1Hz.

Output data rate could be: 1, 0.2, 0.1, which corresponds to 1Hz, 5Hz, 10Hz respectively;

Message types could be GGA, RMC, ZDA, VTG, NTR

gphdt comx 1

| Output current heading information

Heading information includes: HDT, TRA

Reference Station Configuration
The RTK base station should be 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:
   Base Station Mode Number| Command| Description
   ---|---|---
   1| mode base 40.078983248 116.236601977 60.42| set latitude, longitude, and height
   2| rtcm1006 com2 10| Reference station coordinate

(including antenna height)

3| rtcm1033 com2 10| receiver and antenna description
4| rtcm1074 com2 1| GPS correction data
5| rtcm1124 com2 1| BDS correction data
6| rtcm1084 com2 1| GLO correction data
7| rtcm1094 com2 1| Galileo differential correction data
8| saveconfig| Save configuration
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 of time, and will then use the derived value as the base station coordinates. The most usual instructions are as follow:

Self-Optimizing Base Station Mode

of the receiver, or when the standard deviation of horizontal positioning is no more than 1.5 m and that of vertical positioning is no more than 2.5 m, set the average value of horizontal and vertical positioning results as the fixed base station

coordinates.

2| rtcm1006 com2 10| Reference station coordinates, including the antenna height
3| rtcm1033 com2 10| receiver and antenna description
4| rtcm1074 com2 1| GPS correction data
5| rtcm1124 com2 1| BDS correction data
6| rtcm1084 com2 1| GLO correction data
7| rtcm1094 com2 1| Galileo differential correction data
8| saveconfig| Save configuration

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 positioning becomes available. Common instructions for RTK rover configuration are as follows:

MODE ROVER
GNGGA 1
SAVECONFIG

Moving Base Configuration
Different from RTK fixed base station, the moving base station is in motion and simultaneously sends satellite information to the rover station. The rover station receives both satellite observations and differential correction data sent from the moving base station to determine the relative position between the rover station and the moving base station. UM482 can adaptively recognize RTCM data input interface and format. Frequently used instructions for the moving base station are as follows:

Moving Base Station Mode

2

| ****

rtcm1006 com2 1

| Base station antenna coordinates

(include antenna height)

3| rtcm1033 com2 1| Description of receiver and antenna
4| rtcm1074 com2 1| GPS system correction data
5| rtcm1124 com2 1| BDS system correction data
6| rtcm1084 com2 1| GLONASS system correction data
7| rtcm1094 com2 1| Galileo system correction data
8| saveconfig| Save configuration

Heading Configuration
This command is used for dual-antenna receivers (UB482, UM482, 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

5- 1 Heading Schematic for the schematic. Frequently used commands are as follows:
GPHDT 1
SAVECONFIG

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 5- 1 Heading Schematic for the detailed schematic.

Frequently used commands are as follows:

MODE HEADING2
GPHDT2 ONCHANGED
SAVECONFIG

Antenna Detection

UM482 supports dual-antenna detection. The 2-bit detection signals are described below:

2-bit Detection Signals

If the ANT_PWR is not powered correctly or if the antenna is not fed by ANT_PWR, the detection results are invalid.

Firmware Upgrade

Upgrading UM482 may be done using UPrecise software:
Click “…” to browse the firmware update package, and click the “Start” button to start the firmware upgrading process (don’t select the “Reset” checkbox ):

In general, the upgrade time is within 5minutes.

Soldering Recommendation

Recommended thermal cycle curve is as follows:

• Temperature rising Stage
  • Rising slope: Max. 3℃/s
  • Rising temperature range： 50℃-150℃
• Preheating stage
  • Preheating time: 60 – 120 s
  • Preheating temperature range: 150 – 180℃
• Reflux Stage
  • Over soldering temperature (217℃) time: 40 – 60 s Peak temperature: no higher than 245℃
• Cooling Stage
  • Cooling Slope: Max. 4℃ / s

Notes:

• In order to prevent fall-off during the soldering of modules, please avoid soldering the module in the back of the Board during design, that is, better not to go through the soldering cycle twice
• The setting temperature depends on many factors – such as the type of Board, solder paste type, solder paste thickness, etc. Please also refer to the relevant IPC standards and indicators for solder paste.
• Since the lead-free soldering temperatures are relatively low, if using this soldering method, please give priority to other components on the Board.

Packaging

There are 150 pcs UM482 modules inside the package box.

Packaging Instructions

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
info@unicorecomm.com.

References

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• 和芯星通北斗导航芯片-北斗导航模块北斗高精度定位板卡国内外领先的芯片、OEM板卡和产品解决方案提供商

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