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Spirent GSS7725 User Manual

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GSS7725 INTERFERENCE GENERATOR USER MANUAL
DGP01448AAA Issue 6-00 August 2017
Document status: APPROVED

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  • Page 1 GSS7725 INTERFERENCE GENERATOR USER MANUAL DGP01448AAA Issue 6-00 August 2017 Document status: APPROVED...
  • Page 2 PROPRIETARY INFORMATION THE INFORMATION CONTAINED IN THIS DOCUMENT IS THE PROPERTY OF SPIRENT COMMUNICATIONS PLC. EXCEPT AS SPECIFICALLY AUTHORISED IN WRITING BY SPIRENT COMMUNICATIONS PLC, THE HOLDER OF THIS DOCUMENT SHALL KEEP ALL INFORMATION CONTAINED HEREIN CONFIDENTIAL AND SHALL PROTECT SAME IN WHOLE OR IN PART FROM DISCLOSURE AND DISSEMINATION TO ALL THIRD PARTIES TO THE SAME DEGREE IT PROTECTS ITS OWN CONFIDENTIAL INFORMATION.

  • Page 3: Table Of Contents

    6.4 Remote command syntax 6.5 Remote commands CHAPTER 7: CALIBRATION 7.1 Equipment required 7.2 Testing the output level 7.3 Calibrating the output level TERMS & ABBREVIATIONS A.1 Simulator terms GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017 General...
  • Page 4 DGP01448AAA 6-00 A.2 Abbreviations and acronyms SPIRENT CUSTOMER SUPPORT INDEX AND LIST OF FIGURES AND TABLES INDEX LIST OF FIGURES LIST OF TABLES GSS7725 Interference Generator User Manual General © Spirent Communications plc 2002-2017...

  • Page 5: Chapter 1: General

    Calibration procedure change 2017 1.2 Referenced documents a) DGP00686AAA SimGEN Software User Manual. b) MS7725 GSS7725 Interference Generator Datasheet with Product Specification. c) DGP00792AAA SimREMOTE User Manual. 1.3 Copyright notices This document may use the following trademarks or registered trademarks: Microsoft and Windows - trademarks or registered trademarks of Microsoft Corporation.

  • Page 6: Document Format

    Completely isolate mains power by removing the plug from the mains socket, which should be close to the signal generator and readily accessible Wait 10 seconds before re-applying mains power to avoid blowing the mains fuses NOTICE GSS7725 Interference Generator User Manual General © Spirent Communications plc 2002-2017...

  • Page 7: Chapter 2: Overview

    6-00 DGP01448AAA 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...

  • Page 8: Environmental & Safety

    1) DC Isolation can withstand a maximum DC level of ±60V and reverse RF levels to a maximum of 1W. 2.3 Environmental & Safety The GSS7725 is suitable for operation only in a typical office or laboratory environment. Table 2-3 GSS7725 Environmental & Safety parameters...

  • Page 9: Test Waveforms

    Address Controller to GSS7725 IP 192.168.10.1 (default motherboard) addresses 2.5 Test Waveforms Four test waves forms are contained within the install. Table 2-5 GSS7725 Default Waveform Definitions Waveform Description 0x7FFF.bin 16 MS/s, big endian, CW signal, full power 0x4000.bin 16 MS/s, big endian, CW signal test_full.bin...

  • Page 11: Chapter 3: Introduction

    You can combine up to four units to allow multiple vehicles/multiple antennas or multiple L1/L2 vehicle/antenna combinations. The GSS7727 has a single RF input and a single combined RF output. A single GSS7725 may only be associated with one scenario antenna. Between scenarios, you can switch the GSS7725 between scenario antennas.

  • Page 13: Chapter 4: Hardware Configuration

    1) This chapter describes the GSS7725 using single signal generator with one RF output 2) If the GSS7725 is being added to an existing Spirent GSS signal generator a new sig_gen.txt file is required to describe the new configuration as well as a new licence file lservrc.txt 3) For use with GSS9000 a Cal_9 will also be supplied.

  • Page 14: Gss6700

    DGP01448AAA 6-00 4.4 GSS6700 Ethernet GSS7725 Controller GSS6700 Controller Figure 2 GSS6700 & GSS7725 Hardware Connectivity 4.5 GSS7000 GSS7725 Controller Figure 3 GSS7000 & GSS7725 Hardware Connectivity GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017...

  • Page 15: Gss9000

    If this error is seen check the Ethernet connections and if necessary re-power the GSS7725 controller. If the error is still seen you will need to power cycle the Spirent GSS signal generator and any additional controller.

  • Page 17: Chapter 5: Scenario Definition

    2 when interference, as defined by the currently selected hardware configuration, is only available on antenna 1. After you have selected Antenna Signal Types - Interference, you must specify the GSS7725 operating mode from: a) Use File (see Section 5.2).

  • Page 18: Use File

    Either click Select to select an existing file from the Select File dialog (shown in Figure 7) or create a new file by clicking New. Then set SimGEN to use the interference file you specify by selecting the checkbox in the scenario tree. GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017...

  • Page 19: Interference Simulation File Editor

    0 00:00:00 indicates that the action specified will take place at the start time of the scenario, 0 00:00:10 will take place 10 seconds into the scenario, and so on. GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017...

  • Page 20: Using The Interference Simulation File Editor

    The only parameter that can be changed immediately without briefly interrupting the interference RF of the GSS7725 is the power level (note that the GNSS RF path will not be interrupted). Other changes you make in the Interference dialog propagate as commands to the GSS7725 when you click “Update CWI”.

  • Page 21: Interference Commands

    Figure 10 Command type - Comment Interference Custom Waveform 7725 Use this command see Figure 11, to setup the GSS7725 to output the IQ data as RF at the given sample rate, frequency and power. GSS7725 Interference Generator User Manual...
  • Page 22 Reference Level, the data entered in Level directly equates to the J/S ratio. Centre frequency Centre frequency that the IQ signal is to be produced around, default is L1 (1575.42 MHz) GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017...

  • Page 23: Interferer Rf On/Off

    25 MS/s. The output sample rate achievable is reliant upon the specification of the controller machine that the GSS7725 controller software is running upon. i.e. dedicated Ethernet with no other traffic, number and clock speed of CPU cores, SSD vs HDD.

  • Page 24: Interferer Level

    Level and Reference Level Notes: 1) Select Check so that SimGEN determines if: (Level + Reference Level) is less than -130.0 dBm (Level + Reference Level) exceeds -20.0 dBm GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017...

  • Page 25: Interferer Delta Level

    Table 5-1 Mode of operation with a user action file and an interference file User action file Interference file Mode of operation (*.act) (*.itf) none none Interactive interference mode none present Replays the interference file commands GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017...

  • Page 26: Remote Control Interference Commands

    5.5 Remote control interference commands Interference commands can be actioned remotely. Reference b) outlines the syntax for sending remote interference commands to SimGEN to operate the GSS7725. The remote commands are also briefly outlined below for convenience. Table 5-2 GSS7725 SimGEN remote commands...
  • Page 27 1, antenna 1, channel 1 and would adjust the <timestamp>, RF signal level. If the previous level was -20 dBm then the adjustment Delta Level, of -13 would make the signal power output of the GSS7725 be -37 <vehicle>, dBm for the current loaded/played IQ data. <antenna>, <channel>,...
  • Page 28 ::= time in to run specified by: [d] <timestamp> <rf_on_off> hh:mm:ss <vehicle> ::= integer starting at 1 <antenna> ::= integer starting at 1 <channel> ::= integer starting at 1 <rf_on_off> ::= “on” | “off” 5-12 GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017...

  • Page 29: Chapter 6: Independent Remote Control

    As well as using the GSS7725 as part of a SimGEN scenario and controlling it through the SimGEN remote interface, the GSS7725 can be used standalone as an IQ to RF player. To do this the GSS7725 must be commanded via its remote-control interface. Note that the GSS7725 controller software provides the remote interface.

  • Page 30: Remote Command Syntax

    = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect(('192.168.5.30', 13100)) 6.4 Remote command syntax The GSS7725 controller accepts the standard command syntax for programming instruments (SCPI). The full syntax of the commands should be used. Every command apart from “:STATus” returns a standard command return value.
  • Page 31 :OUTput:STArt Start the RF output Stop the RF output :OUTput:STOp Note that when you disconnect from the GSS7725 controller the RF output will stop automatically. Returns the current status of the GSS7725 Controller. The following states can be returned: CONNECTED ...

  • Page 33: Chapter 7: Calibration

    Run the following command as administrator: Calibrate_test.bat A script will now run to test the GSS7725 output level. At each frequency the power output of the GSS7725 will be read from the power meter. The power, if calibrated correctly should be -20dBm +/- 1dB.

  • Page 34: Calibrating The Output Level

    C:\Users\xxxx\AppData\Roaming\.uhd merging with the directory and C:\Windows\System32\config\systemprofile\AppData\Roaming\ .uhd replacing any files at this location. Restart the controller PC, this will automatically load the new calibration file GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017...

  • Page 35: Terms & Abbreviations

    A scheduled change in the navigation data set transmitted by a Cut-over satellite. Equipment Under Test. See "UUT" A computer that controls the Spirent signal generator. It prepares data to drive the signal generator, analyses the results of the Host Computer simulation and performs related housekeeping and miscellaneous functions.

  • Page 36: Appendix Table A-2 Abbreviations And Acronyms

    Galileo carrier frequency Galileo carrier frequency ECEF Earth Centred Earth Fixed Earth Centred Inertial Electronic Counter Measures EGNOS European Geo-stationary Navigation Overlay System EVTP Enhanced Validation Test Program GSS7725 Interference Generator User Manual Terms & Abbreviations © Spirent Communications plc 2002-2017...
  • Page 37 Megahertz (106 Hz) MSAS MTSAT Satellite Augmentation System MTSAT Multi-functional Transport Satellite Most Significant Bit Mean Sea Level Nav Data Navigation data message Nanosecond (10-9 second) National Security Agency GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017 Terms & Abbreviations...
  • Page 38 Vertical Dilution Of Precision VHF Data Broadcast WAAS Wide Area Augmentation System WGS84 World Geodetic System, 1984 Y code Precise Code, A-S mode 1 PPS 1 Pulse Per Second GSS7725 Interference Generator User Manual Terms & Abbreviations © Spirent Communications plc 2002-2017...
  • Page 39 Services staff will create a System Report (SR) and copy you with the SR reference number. Spirent Global Services request you use the SR reference number in all correspondence relating to that incident. All responses from Spirent in relation to your incident will contain the SR reference number.
  • Page 40 Contact Global Support: Tel: + 44 1803 546333 Fax: + 44 1803 546302 E-mail: help@spirent.com Go to http://support.spirent.com for access to Spirent’s Global Support, FAQ and document databases. GSS7725 Interference Generator User Manual Customer support © Spirent Communications plc 2002-2017...
  • Page 41 Frequency Stability, 2-1 FRPA, A-3 Nav Data, A-3 FRPAGP, A-3 Navigation Data (Nav. Data), A-3 ns, A-3 NSA, A-3 Galileo, A-2, A-3 NSC, A-4 GDOP, A-3 GSS7725 Interference Generator User Manual © Spirent Communications plc 2002-2017 Index, figures and tables...
  • Page 42 WAAS, A-4 SAAS, A-4 WGS84, A-4 SBAS, A-4 Scenario, 3-1, 5-2, 5-3, 5-4, A-1 Signal Level, 5-8, 5-9 Y code, A-4 SPS, A-4 Y Code, A-4 GSS7725 Interference Generator User Manual Index, figures and tables © Spirent Communications plc 2002-2017...
  • Page 43 6-00 DGP01448AAA List of Figures Figure 1 GSS6300Mi & GSS7725 Hardware Connectivity .............. 4-1 Figure 2 GSS6700 & GSS7725 Hardware Connectivity ..............4-2 Figure 3 GSS7000 & GSS7725 Hardware Connectivity ..............4-2 Figure 4 GSS9000 & GSS7725 Hardware Connectivity ..............4-3 Figure 5 Antenna Signal Types dialog .....................
  • Page 44 Table 1-1 Formats used in this document ..................1-4 Table 2-1 GSS7725 Technical Performance ................... 2-1 Table 2-2 GSS7725 Connectivity ....................2-1 Table 2-3 GSS7725 Environmental & Safety parameters ............... 2-2 Table 2-4 GSS7725 Operating parameters ..................2-2 Table 2-5 GSS7725 Default Waveform Definitions ................. 2-3 Table 5-1 Mode of operation with a user action file and an interference file ........
  • Page 45 Paignton Devon TQ4 7QR So far as Spirent Communications plc is aware the contents of this document are correct. However, such contents have been obtained from a variety of sources and Spirent Communications plc can give no warranty or undertaking and make no representation as to their accuracy.

  • Page 46: Gss7725 Interference Generator User Manual

    Navigation Simulation Products Copyright © 2016-2017 Spirent Communications plc The copyright of this publication is the property of Spirent Communications plc. Without the written consent of Spirent Communications plc, given by contract or otherwise, this document must not be copied, reprinted or...

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