gss6450 - lange-electronic

GSS64503RF

V3 SW Improvement

Automotive Focus

Apr 2018, Issue 1.00

2Spirent Communications PROPRIETARY AND CONFIDENTIAL

GSS6450 - Record and Playback Solution

• 216 x 200 x 76mm

• Weight 2.2 kg

• Up to 16 bit Record / Playback

• 2TB or 4TB Recording options

• Full GNSS constellation support

• Portable with shoulder strap

• Battery or mains powered

• In-built PC with Linux

3RF

GSS6450 has 3 RF input ports

Frequency Ranges

RF1- GNSS signals, filtered (see previous slide)

RF2- Frequency Range 690 – 2400 MHz

RF3- Frequency range 100 – 6000 MHz

Channel and bandwidths

RF1- up to 4 Channels (10, 30, 50, 60 or 80MHz)

RF2- up to 4 Channels (10, 30, 50, 60 or 80MHz)

RF3- 1 Channel up to 80 MHz.


2 antennas recording into same box

RF 1

Record GPS L1 4bits 30 MHz and

GPS L2 4 bits 30 MHz

RF 2

Record GPS L1 4bits 30 MHz and (set as User defined 1575.42 MHz 30 MHz bandwidth)

GPS L2 4 bits 30 MHz (set as User defined 1227.6 MHz 30 MHz bandwidth)


Web Interface

Similar format but new look/feel

Config page better organised

Bigger buttons for easier use on tablets and phones


Spectrum Analysis

Can do Spectrum analysis without recording OR

While recording

Look at 4 signals

Or look at Spectrum in recorded files


Output Gain

Previously the output RF signal was always played back ‘high’ by around 20dB, to overcome any losses in cable, splitters, and the noise figure of the receiver front end. Ensured no loss in CNo of GNSS signal.

Now option

+ 20dB

+10 dB

0 dB

Note: with 0dB might get CNo loss


AGC compensation

During recording the 6450 AGC varies the input gain to optimise signal level for best recording.

Effectively sets recording at same level regardless of input signal levels. OK for GNSS as all signals are approx. the same strength.

Now we monitor and record the signal level during Recording and on Playback offer two options

1) AGC Compensation ON

Plays back the signal within 3dB of the original RF signal level

2) AGC Compensation OFF

Plays back at a nominal level. (As per last 6450 release and 6425)

For std GNSS tests use AGC off and +20dB output gain


Input Gain

Input Gain Setting

Automatic Gain set automatically on the received signal

Low Use for 8 or 16 bit recordings for signals in the range -80dBm to -30dBM

Medium Use for 8 or 16 bit recordings for signals in the range -100dBm to -40dBM

High Use for 8 or 16 bit recordings for signals in the range -120dBm to -55dBM

Note: Setting the input gain to anything other than Automatic is not recommended for 2

or 4 bit recordings as the dynamic range of the recording is low and it is likely that the

input signal will be outside of the normal recording range of the system.

Input Gain on RF1 (RF2 and RF3) can now be varied

For std GNSS tests leave as Automatic


Improved Phase noise

The attached plot shows the

phase noise from the live

signal in red, and the replayed

signal in blue. There is very

little additional phase noise

generated during the

record/replay process

Plot for GPS SV 02

Carrier phase cycles

In all 1RF units shipped 1 Jan and

3 RF units


Video recording

Record Video (up to 4 devices)

Recorded simply by inserting a WebCam into a USB port

Video stored synchronously. Within 0.5s of the GNSS signals

• Recorded at 640 x 480 pixels at a rate of 15 frames persecond

• Stored in .mp4 format

Plays back onto an attached display

Video can be controlled during playback using a keyboard


Built in High Speed CAN Interface

GSS6450 V3 hardware now includes 2 x HS CAN interface devices

Connected via the AUX port

Recorded synchronous with GNSS signals. Uses Sync 1a and Sync 1b,

Allows HS CAN up to 1Mbps

• Connects to Low Speed and Single Wire CAN via interface adapter

HS CAN requires no external interface box

Dumb interface

• No bus acknowledgements during recording

• No bus arbitration during playback


Optional CAN-FD Interface

External CAN-FD interface unit

Two High-speed CAN channels (ISO 11898-2)

Comply with CAN specifications 2.0 A/B and FD

CAN FD support for ISO and Non-ISO standards

CAN FD bit rates for the data field (64 bytes max.) from 25 kbit/s up to 12 Mbit/s

CAN bit rates from 25 kbit/s up to 1 Mbit/s

Status signalling with two 2-color LEDs

Connections via two 9-pin D-Sub connectors


Optional CAN-FD Interface

Supports

• CAN-FD

• High Speed CAN

• Low Speed CAN via interface adapter

• Single Wire CAN via interface adapter

Connects to the GSS6450 HS CAN interface

Operates as a bit rate speed changer, works up to 5Mbps full speed

• Changes slow-fast-slow FD speed to custom fixed speed protocol


© Spirent Communications, Inc. All of the company names and/or brand names and/or product names and/or logos referred to in this document, in particular the name “Spirent” and its logo

device, are either registered trademarks or trademarks pending registration in accordance with relevant national laws. All rights reserved. Specifications subject to change without notice.

spirent.com

Thank you

lange-electronic.comm

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