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DGP01448AAA
GSS7725 Interference Generator User Manual
© Spirent Communications plc 2002-2017
2-1
Overview
Chapter 2: Overview
This document describes the GSS7725 Interference Simulation System. It details the configuration
and operation of the GSS7725 using SimGEN
and standalone use.
It is an addendum to reference a), the SimGEN
User Manual.
2.1 Technical Performance
Table 2-1 GSS7725 Technical Performance
Parameter
GSS7725
Frequency Range
850MHz to 2.2 GHz
Frequency Resolution
100 Hz
Frequency Stability
<
± 1 ppm/yr, ± 1 ppm typical over 0 to +55
°
C
Bandwidth (3dB)
Up to 25 MHz
In band flatness
± 1.5 dB RSS
In band spurious
<-25 dBc
Harmonics
<-25 dBc
GNSS signal level
-130 dBm
GNSS signal level control
± 20 dB
GNSS signal level accuracy
± 1.0 dB RSS
I/S ratio relative to nominal GPS C/A signal
level
0 to +110 dB
Interference level expressed as absolute
power
1
-130 to -20 dBm
Interference accuracy (CW) – I/S 10 to 110
dB
± 2.0 dB RSS
Interference level resolution
1 dB (nominal)
Note:
1) Specified maximum interferer level in a20 to +30 °C. Typically the maximum level reduces by
0.2 dB/°C outside of this range.
2.2 Connectivity
Table 2-2 GSS7725 Connectivity
Port
Type
Detail
Description
RF OUTPUT
OUT
Coaxial Type ‘N’
Female
Front Panel
Provides the primary Combined GNSS
+ Interference signal output at specified
levels.
50 ohm VSWR <1.25:1 (in band).
DC isolated
1
GNSS IN
IN
SMA
Provides connectivity to GNSS input
source.
50 ohm VSWR <1.25:1 (in band).
DC isolated
1
10 MHz
IN
Coaxial Type ‘BNC’
Socket
Allows the GSS7725 to be locked to an
external reference of 10 MHz sine or
