Racelogic VBOX SIGMA Bedienungsanleitung

VBOX Sigma User Manual

•01 - VBOX Sigma Introduction

•02 - VBOX Sigma Hardware Overview

•03 - VBOX Sigma Getting Started

•04 - VBOX Sigma Configuration

•05 - VBOX Sigma Display

•06 - VBOX Sigma Data Analysis Software

•VBOX Sigma - CAN Output Format

•VBOX Sigma - PIN OUTS

•VBOX Sigma - RS232 Output Format

•VBOX Sigma - Technical Specification

•How to Update the VBOX Sigma Firmware

01 - VBOX Sigma Introduction

VBOX Sigma (RLVBSIGMA) is a cost-effective, RTK enabled 10 Hz data logger with integrated NTRIP modem. Its multi-

constellation, multi-frequency GNSS engine offers outstanding RTK performance even in areas with poor and multi-path

satellite coverage.

When used in conjunction with an RTK base station or NTRIP correction service, VBOX Sigma is accurate to within a

centimetre and is the ideal reference for ground truth.

The in-built NTRIP modem makes it easy to receive RTK correction messages from an NTRIP network, either via Wi-Fi

or a 4G cellular connection. In order to use this type of correction you have to register and subscribe to a cellular data

plan with your local NTRIP provider, such as Topnet in the UK and Germany, Swepos in Sweden or Unavco in the USA.

Features

•Accuracy - When used in conjunction with an RTK

base station or NTRIP correction service, VBOX

Sigma is accurate to within a centimetre and is the

ideal reference for ground truth.

•Reliable GNSS Reception - Its multi-constellation,

multi-frequency GNSS engine offers outstanding

RTK performance even in areas with poor and

multi-path satellite coverage.

•Cost-effective - Using the latest GNSS receiver,

VBOX Sigma is an incredibly cost-effective solution

for reliable PNT measurement.

•In-built NTRIP Link - The integrated NTRIP

modem makes it easy to receive RTK correction

messages from an NTRIP network, either via Wi-Fi

or a cellular connection.

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•Data Recording - VBOX Sigma records data at 10

Hz and saved it to an SD card for data analysis.

•CAN Bus Output - VBOX Sigma has a CAN Bus

output for connection to a 3rd party data logger or

another device.

•Live Data Display - VBOX Sigma has a serial

output for live data display on your PC (running

VBOX Test Suite software).

•Integration - VBOX Sigma can be used as an add-

on product or built into your own solution to provide

accurate ground truth. Please ask us for options to

integrate.

Inputs

Unit Power

Input Voltage Range (automotive)

• 7 V to 30 V DC (Hirose)

• 5 V (USB-C)

Power Consumption <5 W

GNSS Antenna Supply

Supply Voltage 3 V DC

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Outputs

CAN Bus

Output Data Rate 125 kbit/s, 250 kbit/s, 500 kbit/s and 1 Mbit/s selectable

baud rate. Software controlled CAN termination

Data available

Satellite count, time, position, speed, heading, altitude,

vertical velocity, longitudinal acceleration, lateral

acceleration, solution type, date, correction age, serial

number

RS232

Output Data Rate 10 Hz

Data available

Satellite count, time, position, speed, heading, altitude,

vertical velocity, longitudinal acceleration, lateral

acceleration, solution type, date, correction age

How Does RTK Work

Standard GNSS looks for changes in the signal codes sent by each satellite. This is done by measuring the times of

signal edges, and then calculating the time for the signal to arrive.

When comparing two signals, we are measuring a time delay of about ~0.07 s. This is the time delay from satellite to

receiver, which is about 20,000 km.

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To obtain accuracy up to 1 cm, we need to measure the time delay between these signals down to 0.00000000003 (1/

30th of a nanosecond). The picture below shows a single rise between 0 and 1 (highlighted in the image above).

It is difficult to compare this with the reference to 1/30th of a nanosecond, as we do not know at which exact point along

this rise, the change from 0 to 1 happened.

This means that the positional accuracy when using corrected GNSS signals (called code-phase signals) alone is

around 0.5 m.

To obtain a higher level of accuracy, up to 1 cm, another technique needs to be used in conjunction.

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We use a GNSS ‘carrier wave’ signal, transmitted at a very high frequency (1575 MHz) to pinpoint the exact moment

the signal rises from 0 to 1.

You can see from the image above that the phase of the carrier signal flips when the data signal changes.

Because this signal is being transmitted at such a high frequency, it means that we can measure with far greater

precision, exactly when the signal change occurred.

This provides a much higher timing resolution, so, when we are lining up our real time and corrected signals, we know

with a much greater accuracy, when that signal changed. Therefore, we know to a much greater accuracy what the true

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distance is between the satellite and the receiver.

The difference this makes is shown on a 24 hour plot below. The un-aided GNSS is shown in red, while the RTK is

shown in green at the centre.

RTK versus un-aided GNSS

NTRIP Guidance

In order for some NTRIP Casters to work, they require your position. This is true if the service you are using has multiple

reference stations over a large area, in which case it will need to know which one is closest to you.

This is achieved by your GNSS engine sending a GGA NM A message to the caster, which needs to be enabled on

your GNSS engine. This message can be set to transmit every 10 s, it is not necessary to send it more often than that.

Note that if the NTRIP service you are using requires a GGA message, and it is not sent, you will not receive any data. If

you are using your own Base Station, or a service with only one Base Station, then the GGA message is not needed.

NTRIP delivered RTCM v3 messages are usually sent once a second or once every two seconds. RTK can usually still

be accurate even if the message is up to 60 s old, but for best performance, keep this as short as possible.

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The VBOX Sigma GNSS engine can use the following signals:

• GPS L1/L2C

• Glonass L1OF, L2OF

• Galileo 1B/C, 5b

• Beidou B1I, B2I

Therefore it is important that the NTRIP service you use transmits all of these corrections.

The transmission of these correction signals at 1 Hz uses approximately 1 kB per second depending on how many

satellites are visible, so if you are intending to use a SIM card to connect to the NTRIP server, ensure that you have

enough data available.

Registration

So that Racelogic can continue to provide you with notification of the latest software releases, firmware upgrades and to

offer technical support, please register your VBOX Sigma.

Standard Inventory

Product Code Quantity Description

VBSIGMA-V1 1 VBOX Sigma Unit

RLACS308 1 GNSS Antenna

TTV1AM20MB31 1USB-A to USB-C Fast Data/Power

Cable

RLCAB010H 1Hirose 3 W Plug to Cigar Plug

Power Cable, 2 m

8 GB SD Ultima Pro UHS-1

Memory Card 1 RLACS313

ANTMSTUBSMAM 1 Multi Band Antenna

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Optional Accessories

Product Code Description

RLCAB170 6 Way Hirose to 5 Way Lemo - 2 m

RLCAB001-H 6 Way Hirose to 9 Way D-Connector - Serial cable

RLCAB181 6 Way Hirose to 9 Way D-Connector - CAN cable

RLCAB164 6 Way Hirose to Unterminated

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02 - VBOX Sigma Hardware Overview

VBOX Sigma has various connections/ sockets on the top and bottom of the unit, along with an OL D display and

buttons.

Front

OLED Display

The front panel of the unit contains an OL D screen

which displays status and connection information. Three

screens are available to view, more information on these

is available here.

Buttons

Back Button

Pressing the Back Button on the left will return to

the Home Display Screen if currently on another

display screen.

Up/Down Buttons

The Up and Down Buttons are used to navigate

between the three different display screens, more

information on these is available here.

Square Button

Pressing the Square Button on the right will start/stop

logging irrespective of the Logging Strategy selected

within the VBO Log Settings area of the Wi-Fi hotspot

configuration interface. More information on logging is

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Andere Handbücher für VBOX SIGMA

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