TERSUS PRECIS-BX316R User Manual

User Manual

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More details, please visit www.tersus-gnss.com

User Manual

Version V1.0-20170623

User Manual

Precis-BX316R

©2017 Tersus GNSS Inc. All rights reserved.

]

TERSUS-GNSS I

Proprietary Notice

All Information in this document is subject to change without notice and does not reflect the
commitment on Tersus GNSS. No part of this manual may be reproduced or transmitted by all
means without authorization of Tersus GNSS. The software described in this document must be
used in terms of the agreement. Any reverse software engineer or modification without permission
from Tersus GNSS is not allowed.

Revision History

Date

Major change

Version

2017-06-23

Initialization

1.0

© Copyright 2015-2017 Tersus GNSS,

All rights reserved

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TERSUS-GNSS II

Table of Content

1. Introduction ........................................................................................................................ 1

1.1 Overview of R Board ..................................................................................................... 1

1.2 Features of BX316R Board ............................................................................................ 1

1.3 System Overview ........................................................................................................... 1

1.4 Connectors and Indicator Locations .............................................................................. 2

1.5 BX316R Receiver .......................................................................................................... 3

2. Setting Up the Receiver ..................................................................................................... 6

2.1 Antenna installation ....................................................................................................... 6

2.2 SD card operation

1

......................................................................................................... 7

2.3 Reset button

1

.................................................................................................................. 8

3. Specifications ..................................................................................................................... 9

3.1 Performance Specification ............................................................................................. 9

3.2 Electronic Characteristics ............................................................................................ 10

3.2.1 Absolute Maximum Ratings .................................................................................... 10

3.2.2 Operation Ratings .................................................................................................... 11

3.3 Physical Specification .................................................................................................. 11

3.3.1 Physical Specification for BX316R board ............................................................... 11

3.3.2 Cables for BX316R receiver ................................................................................... 12

4. Trouble Shooting ............................................................................................................. 14

5. Terminology..................................................................................................................... 15

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TERSUS-GNSS III

List of Figures

Figure 1 Outlook of Precis-BX316R Board ...................................................................................... 1

Figure 2 BX316R board block diagram ............................................................................................ 2

Figure 3 Outlook of Precis-BX316R receiver ................................................................................... 4

Figure 4 Right panel .......................................................................................................................... 4

Figure 5 Left panel ............................................................................................................................ 4

Figure 6 Recommended GNSS Antennas for Precis-BX316R ......................................................... 7

Figure 7 BX316R receiver dimension ............................................................................................. 12

Figure 8 Power cable ....................................................................................................................... 12

Figure 9 Universal port cable .......................................................................................................... 13

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TERSUS-GNSS IV

List of Tables

Table 1 LED definition...................................................................................................................... 5

Table 2 Two models of BX316R receivers........................................................................................ 6

Table 3 Default Serial port parameter of Precis-BX316R COM1 and COM2 .................................. 6

Table 4 Performance specification of Precis-BX316R ...................................................................... 9

Table 5 Description of Absolute Maximum Ratings for BX316R board ........................................ 10

Table 6 Description of Operation Ratings for BX316R board ........................................................ 11

Table 7 Physical Specification of Precis-BX316R board ................................................................ 11

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TERSUS-GNSS 1

1. Introduction

1.1 Overview of BX316R Board

The Precis-BX316R board provides GNSS (Global Navigation Satellites System) raw
measurements from two antennas as well as single positioning. Max. 32G SD card on-board,
versatile interfaces and light weight make it especially suitable for the PPK (Post Processing Kinematic)
application, such as LiDAR, UAV (Unmanned Aerial Vehicles) mapping etc.

Figure 1 Outlook of Precis-BX316R Board

1.2 Features of BX316R Board

■ Support GPS L1/L2, GLONASS L1/L2, and Beidou B1/B2 from primary antenna;

■ Support GPS L1+GLONASS G2 or GPS L1+BDS B2 from secondary antenna;

■ Support single positioning;

■ Support up to 20Hz raw measurements output.

■ Support 2 COMs and 1 PPS (Pulse Per Second accuracy timing);

■ Support Ethernet port;

■ Support event mark input;

■ Powered by 5~12V for board;

■ Onboard 6DOF IMU, support integrated navigation system (INS).

1.3 System Overview

Precis-BX316R board block diagram is presented as follows

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TERSUS-GNSS 2

Figure 2 BX316R board block diagram

RF module: Receives GNSS signals from the primary and the secondary antennas, sends to
baseband module as IF signal after filtering and low noise amplifying.
Baseband: Demodulates GNSS IF signals into navigation message.
MPU: A microprocessor for PVT calculation, differential position processing, and data transfer to
and from peripherals.
IMU: an on-board 6 axis IMU can provide motion tracking information under obstacles
environment where GNSS signal is lost.
I/O interface: Includes two serial ports, an Ethernet port, event mark and power supply etc.

1.4 Connectors and Indicator Locations

The following connectors are installed on the board:
 Two SMA connectors, which are used for RF signals input and power output to the LNA in

the active antennas. P-Ant is connected to the primary and S-Ant to the secondary antennas.
If only one antenna is used, connect it to P-Ant and S-Ant is float.

 Four LEDs to show the status of the board, see Table 1 LED definition for the definition.
 Universal comm-port1, a 40-pin connector is used to communication between the receiver

and a computer or a controller. Two serial ports, two CAN ports, event input, PPS output and
an Ethernet are included in this connector, see Figure 9 for more detail.

 Power connector for power input, see Figure 8 for detail about the power cable.
 Data log button1, press to log the data to the SD card.
 SD card slot1, max 32G Micro SD card is supported.
 Reset button1. Reset the receiver anytime this button is pressed. The function is the same as

input „RESET‟ command to the receiver, see Log and Command reference manual for more
about this command.

Note 1 Contact Tersus support for more about these connectors.

RF module

GNSS

De-modulator

MPU

I/O

P-Ant

IMU

S-Ant

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TERSUS-GNSS 3

Top View

Bottom View

1.5 BX316R Receiver

To facilitate the use of the BX-316R board, Tersus provides a BX-316R receiver. After the specific
communication cable and power cable are installed, it will be easy for a customer to use this
receiver.

40-pin connector

for communication

S-Ant

Four LEDs

Power connector

Data log button

Reset button

SD card slot

P-Ant

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TERSUS-GNSS 4

Figure 3 Outlook of Precis-BX316R receiver

A power port and a universal comm port are on the panel at the right side; the LED, the reset & the
log buttons, and a Micro-SD card slot are also provided on the right panel. Table 1 gives the LED
definition.

Figure 4 Right panel

Two antennas connectors are on the left panel.

Figure 5 Left panel

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TERSUS-GNSS 5

Table 1 LED definition

LED

Description

Pwr & Log

Will ON after the receiver is power on, and flash during data collection

GPS

Will flash at the same frequency as the measurements output.

Base

Reserved

RTK

Reserved

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TERSUS-GNSS 6

2. Setting Up the Receiver

The main aim of Rrecis-BX316R is to save the raw measurements for post processing. In order to
output raw measurements, BX316R needs the GNSS signals input from the SMA connectors
P-Ant and S-Ant. If raw measurements from only one antenna are needed, connect the antenna to
P-Ant and leave S-Ant float.
COM1 port is used for configuration commands input and solution output. The level of COM1/2
can be LVTTL or RS-232; the level of the CAN bus can be LVTTL or ISO 11898, see Table 2 for
the two models of BX316R.

Table 2 Two models of BX316R receivers.

Part number

Description

BX316R-T

The serial level and CAN are LVTTL.

BX316R

The serial level is RS-232, CAN level is ISO 11898

Default parameters of COM1/2 are given in Table 3, which can be changed with COM command;
refer to Log & Command Reference document for detail about this command.

Table 3 Default Serial port parameter of Precis-BX316R COM1 and COM2

Serial port parameter

Default value

Baud rate

115200

Byte Size

8 bits

Parity

None

Stop Bits

1bit

Flow Control

None

2.1 Antenna installation

Precis-BX316R provides two SMA male connectors for connecting to GNSS antennas. Both
active and passive GNSS antennas are acceptable. For active antenna, BX316R board can provide
5V, up to 100mA current to the LNA in the antenna. Two recommended Antenna types are shown
in Figure 6. For more about the antennas, visit our accessories website at

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TERSUS-GNSS 7

https://www.tersus-gnss.com/collections/gnss-accessories.

Figure 6 Recommended GNSS Antennas for Precis-BX316R

The installation location for an antenna is supposed to have good view of sky and far away from
any potential transmitter.

Precis-BX316R can be accessed with a serial terminal tool, it‟s recommended to communicate it
with graphical tool Tersus GNSS Center, the link is here.

Refer to BX306 user manual or contact Tersus support for more about the setup of BX316R.

2.2 SD card operation

1

BX316R is supporting on-board Micro-SD card, which make it easy for customer to save data for
post processing.

Before the SD card is plugged, please ensure:

 The max. size of the SD card is 32GB.
 The SD card is formatted, and the file system is FAT32 or NTFS

The SD card can be inserted to the slot when the receiver is power on. Place the SD card into the
slot, and plug it gently toward the bottom of the slot until you feel a click. After the data collection
is finished, press the card gently toward the bottom of the slot until it‟s unplugged.

Note: Please ensure the data collection is finished before the SD card is unplugged, otherwise, the
files on the SD card may be corrupted, or even the SD card can be damaged.

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TERSUS-GNSS 8

Data collection:

Use the LOG command to specify the logs to send to the SD card. For example, a standard
logging configuration for GPS-GLONASS post-processing applications would be:

LOG FILE VERSIONB ONCE
LOG FILE RANGECMPB ONTIME 1

LOG FILE RAWEPHEMB ONNEW
LOG FILE GLOEPHEMERISB ONNEW

A file name is automatically generated based on the PSN of receiver and an automatically incrementing
number beginning at one. If a log in the sequence number is deleted, the number is recycled for use in
order.
When the data-saving is ongoing, press the log button to stop the data saving and press once again to
continue data-saving.

2.3 Reset button

1

The BX316R can be reset by press the reset button on the right panel, this operation is like input
„RESET‟ command to the receiver, refer to Tersus Log & Command Reference document for more
about this command.

Note 1: These two sections are not finalized; please contact Tersus support for the latest information
about the operation of the SD card.

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TERSUS-GNSS 9

3. Specifications

The detailed performance and physical specification of Precis-BX316R is introduced in this
chapter.

3.1 Performance Specification

The performance of BX316R board is listed in Table 4.

Table 4 Performance specification of Precis-BX316R

Feature

Specification

Channel Number

192

Supported Signals by P-Ant

GPS L1/L2/+GLONASS G1/G2+Beidou B1/B2

Supported Signals by S-Ant

GPS L1+GLONASS G2 or GPS L1+BDS B2

Standard Positioning Accuracy

Horizontal (RMS)

1.5m

Vertical (RMS)

3.0m

Observations Accuracy

C/A Code (zenith direction)

10cm

P Code (zenith direction)

10cm

Carrier Phase (zenith direction)

1mm

Time to First Fix (TTFF)

Cold start

<50s

Warm start

<10s

Initialization

<10s (typically)

Initialization reliability

>99.9%

Timing Accuracy (RMS)

20ns

Velocity Accuracy (RMS)

0.05m/s

Max. Update Rate

20Hz

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TERSUS-GNSS 10

3.2 Electronic Characteristics

3.2.1 Absolute Maximum Ratings

Table 5 Description of Absolute Maximum Ratings for BX316R board

Note: Stressing the device beyond the “Absolute Maximum Ratings” may cause permanent

damage. These are stress ratings only. The product is not protected against overvoltage or reversed
voltages. If necessary, voltage spikes exceeding the power supply voltage specification, given in
table above, must be limited to values within the specified boundaries by using appropriate
protection diodes.

Parameter

Symbol

Condition

Min

Max

Unit

Power Supply Voltage

Vin 5

12

V

Input pin applied DC Voltage

RXD_UART

3.6 V Vin

3.6 V

DC current through any digital
input pin

Ipin

10

mA

Input power at RF_IN

Prfin

Source

impedance =

50 Ω,

continuous

wave

13

dBm

Antenna bias voltage

V_ANT

6

V

Antenna bias current

I_ANT

100

mA

Storage temperature

Tstg

-40

85

°C

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TERSUS-GNSS 11

3.2.2 Operation Ratings

Table 6 Description of Operation Ratings for BX316R board

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Power Supply Voltage

VCC

5

12

V

Power (typical)

P 3.5

W

Digital IO Pin Low
level input voltage

RXD_UART

0 0

0.66

V

Digital IO Pin High
level input voltage
Digital EVENT input
voltage
Digital PPS output
voltage

TXD_UART

VIL

V

IH

VOL
VOH

2.3

2.0

2.3

3.3

0.8

0.55

V

V
V
V
V

Output Power voltage

Vout

3.135

3.3

3.465

V

Output Power current

Iout 200

mA

Antenna bias current

I_ANT

100

mA

RF Input Level

Prf

-122 -85

dBm

Operation
temperature

Topt

-40 85 °C

Note: All specifications are at an ambient temperature of 25°C. Extreme operating temperatures
can significantly impact specification values. Applications operating near the temperature limits
should be tested to ensure the specification.

3.3 Physical Specification

3.3.1 Physical Specification for BX316R board

Table 7 Physical Specification of Precis-BX316R board

Feature

Specification

Power

5~12VDC

Power Consumption

3.5W (Typical)

Active Antenna Input Impedance

50Ω

Max. Antenna Bias Current Draw

100mA

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TERSUS-GNSS 12

GNSS input sensitivity

-85 dBm ~ -122 dBm

Size

108×54×1 2mm

Weight

44g

Temperature

-40℃～+85℃

Humidity

95% non-condensing

Vibration

TBD

Shock

TBD

Figure 7 BX316R receiver dimension

Note: Dimensions are in milli-meters

3.3.2 Cables for BX316R receiver

Power cable

Tersus provides a power cable as the accessory of the BX316R receiver. The other end is an USB
male type-A connector, which can be inserted into the USB port in a computer.

Figure 8 Power cable

Universal comm cable

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TERSUS-GNSS 13

A specific cable assembly is used to connect to the universal comm port. The 40-pin connector at
one end of the cable is Mouser‟s DF50S-40DS-1V or equivalent, the connectors at the other end
includes:

Mouser‟s 798-DF1EA-8EP-2.5C 1pcs
Mouser‟s 798-DF1EA-6EP-2.5C 2pcs
Mouser‟s 798-DF1EA-5EP-2.5C 1pcw
Mouser‟s 798-DF1EA-4EP-2.5C 2pcs
Mouser‟s 798-DF1EA-2EP-2.5C 3pcs

Figure 9 Universal port cable

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TERSUS-GNSS 14

4. Trouble Shooting

4.1 Why my configuration lost after the board is power off?

You need execute „saveconfig‟ command to save your configuration to the

non-volatile memory before power off; otherwise, your configuration will lost as long
as it is powered off.

4.2 Why I can receive NMEA data from the board, but I cannot configure it?

It depends on the serial tool you are using. The board can only recognize the

command end up with „\r\n‟ (carriage and line feed) and these two characteristics

need to be added automatically by the serial tools, which is often referred as „new line

mode‟. In order to avoid this case, we recommend you configure the board with

Tersus GNSS Center, which can be downloaded from our website.

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TERSUS-GNSS 15

5. Terminology

ASCII

American Standard Code for Information Interchange

CMR

Compact Measurement Record

DC

Direct Current

ESD

Electro Static Discharge

ECEF

Earth Center Earth Fixed

GLONASS

GLObal NAvigation Satellite System

GNSS

Global Navigation Satellite System

GPS

Global Positioning System

IF

Intermediate Frequency

IMU

Inertial Measurement Unit

IO

Input/Output

LED

Light Emitting Diode

LNA

Low Noise Amplifier

MPU

Micro Processing Unit

NMEA

National Marine Electronics Association

PC

Personal Computer

PPS

Pulse Per Second

RF

Radio Frequency

RINEX

Receiver Independent Exchange format

RMS

Root Mean Squares

RTK

Real-Time Kinematic

RTCM

Radio Technical Commission for Maritime Services

SMA

Sub-Miniature-A interface

TTFF

Time to First Fix

TTL

Transistor-Transistor Logic level

UART

Universal Asynchronous Receiver/Transmitter

USB

Universal Serial BUS

WGS84

Word Geodetic System 1984