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Test setup

R&S

®

SMBVB-K362, R&S

®

SMW-K362

7

User Manual 1178.9126.02 ─ 04

3

Test setup

The following figure provides an overview of the test setup. In this example, the instru-
ment R&S

SMBV100B is used. The test setup with another supported instrument is

similar.

Controller PC

LAN

Serial

IVS

GNSS

Receiver

RF

R&S SMBV100B

LAN

Attenuator

The test setup comprises the following components:

●

An instrument, providing GNSS signals to the IVS for positioning.
Connect the RF output port of the instrument to the RF port of the IVS (GNSS
receiver).

●

A computer executing the R&S

CMWrun.

The computer controls the instrument via SCPI connections (typically LAN). It con-
trols the IVS typically via vendor-specific commands on a serial port interface.

●

External attenuator is recommended for levels below -120 dBm, refer to

Power Attenuation"

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Summary of Contents for SMBVB-K362

Page 1: ...R S SMBVB K362 R S SMW K362 Generic GNSS Test Suite User Manual 1178912602 Version 04 ÜéJ2 ...

Page 2: ...49 89 41 29 0 Email info rohde schwarz com Internet www rohde schwarz com Subject to change data without tolerance limits is not binding R S is a registered trademark of Rohde Schwarz GmbH Co KG Trade names are trademarks of the owners 1178 9126 02 Version 04 R S SMBVB K362 R S SMW K362 The following abbreviations are used throughout this manual Options R S SMBVB K362 and R S SMW K362 are abbrevia...

Page 3: ...eparation of controller PC 8 4 2 Preparation of instrument connection 8 4 3 Preparation of IVS connection 9 5 Test configuration 14 5 1 Connection setting 14 5 2 Vehicle simulation setting 15 5 3 GNSS simulation setting 16 5 4 Signal power setting 17 5 5 Test case setting 18 5 6 Advanced settings 22 6 Test results 24 7 Monitoring 26 8 Test module details 28 ...

Page 4: ...Contents R S SMBVB K362 R S SMW K362 4 User Manual 1178 9126 02 04 ...

Page 5: ...meris and almanac data from all satellites are cleared and thus the receiver has to gain all data and the time to first fix is measured One measurement step comprises signal acquisition at the TX level of 130 dBm and the cold start of the DUT until it can acquire the signal again The cold start is executed with specified repetitions The averaged measurement time must not exceed con figurable TPosF...

Page 6: ...R S SMBVB K66 Galileo R S SMBVB K94 GLONASS R S SMBVB K108 antenna pattern spinning and attitude simulation for test location accuracy with moving receiver blockage and environment model test case 4 Required equipment for R S SMW K362 R S SMW200A for GNSS simulation must be equipped with the following options Hardware HW option R S SMW B10 HW option R S SMW B13 HW option R S SMW B103 B203 Minimum ...

Page 7: ...LAN Attenuator The test setup comprises the following components An instrument providing GNSS signals to the IVS for positioning Connect the RF output port of the instrument to the RF port of the IVS GNSS receiver A computer executing the R S CMWrun The computer controls the instrument via SCPI connections typically LAN It con trols the IVS typically via vendor specific commands on a serial port i...

Page 8: ...ng no license is found 4 2 Preparation of instrument connection 1 For remote control of the instrument configure the resource settings Resources menu SCPI Connections Configure the SCPI resource settings compatible to the test instrument For the control of R S SMBV100B the entry with an alias SMBV is used For the control of R S SMW200A the entry with an alias SMW is used Refer to the sequencer use...

Page 9: ...s of test plan specific resources are saved within the test plan 4 3 Preparation of IVS connection 1 For the remote control of an IVS configure the resource settings in Resources menu Serial Port Use settings compatible to your IVS Refer to the sequencer user manual section Resources Serial Port 2 The following steps configure DUT attributes and properties Create your test plan a In the tab Test P...

Page 10: ...est plan in the directory created in step 2 4 Prepare your DUT s file a In the tab DUTs you find several pre defined DUT s configurations To create your own double click IVSTemplate xml to open configuration dialog Edit DUT Properties b Modify Manufacturer entry to assign DUTs name Otherwise you overwrite the pre defined template Preparation of IVS connection ...

Page 11: ...nd sending with COM port NMEA reading The default port is specified via Resources Serial Port Set all commands for which parameters are available Furthermore it is impor tant to set the control method for the IVS Read Back function to read the NMEA stream properly For AT commands map the serial ports accordingly to bi directional or two way usage Bidirectional uses common serial port for IVS confi...

Page 12: ...d commands to not in use to avoid automated stops for man ual input ASCII or hexadecimal notations are supported e Set all needed commands to control method default f Set all not needed commands to control method not in use During test case execution only command requests for all default commands show up 5 Assign a test plan to a DUT In the tab Test Plans select your test plan created in step 2 Se...

Page 13: ...w assigned to your DUT 6 Always start your tests from the tab DUTs by double clicking a test plan assigned to your DUT It guarantees that the test plan executes the vendor specific com mands of your DUT Otherwise the test plan is aborted with the error DUT type not found Preparation of IVS connection ...

Page 14: ...to Default resets all settings global settings the settings of all test cases and advanced settings Changing the default settings results in deviation from the recommendations of test specifications Any such change is indicated in the measurement report Test specifica tion parameter values are always shown in SCPI report Use the navigation tree on the left to open the corresponding configuration d...

Page 15: ...e geo position of the IVS and simulates its movement Simulation Start Date Time Specifies the time signaled within the generated positioning data Reference Vehicle Location Specifies the IVS location Select predefined location or specify geographical position manually in coordinate system WGS84 Set to Default Resets all settings in the dialog Vehicle simulation setting ...

Page 16: ...en the corresponding signals Tab Constellation Selects navigation files simulating satellite positions Current GNSS almanac data can be downloaded from Internet via https www navcen uscg gov Do gpsArchives exten txt ftp ftp glonass iac ru MCC ALMANAC RINEX files can be downloaded from http cddis gsfc nasa gov gnss_data sum html brdc Beidou files can be downloaded from http www csno tarc cn support...

Page 17: ...on External attenuator is recommended for levels below 120 dBm for the following rea sons The level uncertainty increases for lower levels The maximum attenuation of the internal step attenuator is 150 dBW Lower levels are achieved by reducing the internal amplification The signal level goes down but the noise floor remains at a constant level Applying an external attenuator instead decreases the ...

Page 18: ...nabled in this test module per GNNS standard including waiting time e g for acquisition The following description covers only remaining settings Test Case 1 18 Test Case 2 19 Test Case 3 19 Test Case 4 20 Test Case 5 21 Test Case 6 21 Test Case 7 22 Test Case 1 Verify NMEA transmission from DUT Data rate for NMEA messages transmission Maximum jitter NMEA block interval ratio maximal jitter allowed...

Page 19: ...ipti cal trajectory with changing velocity A user defined movement model can also be selected Error thresholds define the test limit values for a moving receiver see also Test Case 2 on page 19 Blockage model simulates a vehicle passing through two tunnels one after another To use the blockage model enable the Blockage and specify the time duration when the satellite is invisible tblocked and visi...

Page 20: ...Shield to the west C 5 to 30 30 to 150 40 dB Shield to the east remaining remaining 0 dB Open sky Test Case 4 Time to first fix under cold start conditions Configures the number of measurements and the power offset to the reference satellite system power One measurement comprises a configurable visibility interval cold start of the DUT while satellites are continuously available and the configurab...

Page 21: ...ied TPosFix Test Case 6 Tracking and acquisition sensitivity Start power The initial power in the acquisition phase Acquisition step timeout Wait duration for the position fix at a certain power level before increasing the level again The acquisition sensitivity is measured at increasing power steps and is stopped if IVS reports signal acquisition or the maxi mum output power of instrument is reac...

Page 22: ...itivity Test threshold utilized for the verdict Test Case 7 Functional RAIM test Error SV type The supported satellite systems depend on the selection in the GNSS simulation GPS Galileo GLONASS Beidou Number of SV Number of satellites with erroneous pseudorange Durations Duration before during and after pseudorange error ramp Total error Simulated position error in m 5 6 Advanced settings The foll...

Page 23: ... Parallel the configurations of the instrument and IVS are started in parallel SMx first the instrument is configured first afterwards the IVS is configured GNSS signal logging rate sets the rate for GNSS signal logging at R S CMWrun Tolerate position fix lost maximum tolerance time allows the 3D fix to be lost and sets its maximum time duration Timeout tracking mode maximum total time duration fo...

Page 24: ... K362 24 User Manual 1178 9126 02 04 6 Test results The measurement report contains results one table for each executed test case The tables list the test items and conditions the performed test steps their results and pass fail verdicts ...

Page 25: ...Test results R S SMBVB K362 R S SMW K362 25 User Manual 1178 9126 02 04 The last table lists all errors and warnings collected during the test execution ...

Page 26: ...rowser In the monitoring view you find a graphical representation of measured signal charac teristics The monitoring view consists of a main view Welcome to GNSS Testsuit Monitoring and several views that can be dragged and dropped to the main pane via buttons to the right The views can be opened using the buttons to the right via drag and drop to the main view A button of an opened view changes t...

Page 27: ... does not use their positioning data Planimetric Error displays the position estimation error in meters vs time Circular Error displays the position estimation error in meters vs angle Velocity Error displays the measured velocity error in meters per second vs time Altitude Error displays the altitude estimation error in meters vs time Trajectory Profile displays the trajectory length in km vs pos...

Page 28: ...ual 1178 9126 02 04 8 Test module details The tests configure and control the simulated GNSS For each test case the test automatically configures and controls the IVS as required for the test case The test executes all test cases listed with an enabled checkbox ...

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