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A-GPS OTA Test System All Info

A-GPS OTA Test System

ETS-Lindgren's AMS-8000 system supports fully automated A-GPS receiver performance testing per Version 3.0 of the CTIA's Test Plan for Mobile Station Over the Air Performance. Instrumentation options are available to support A-GPS testing of GSM/UMTS and/or CDMA devices.

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A-GPSTesting Datasheet Product Datasheet

Key Features

  • Performs Over the Air A-GPS Measurements per Version 3.0 of CTIA Test Plan for Mobile Station O Over the Air Performance
  • Supports A-GPS Testing of GSM, UMTS, and CDMA Devices
  • Reduces TIS Measurement Time Using RSS-Based Measurement Methods
  • Supports Instrumentation from Major Equipment Suppliers
  • Upgrade Pathways Available for Existing AMS-8000 Series Customers
  • A Complete Integrated Solution with Optional Audit Assistance for Achieving Certification Status


A new receive signal strength (RSS) based test method uses the A-GPS carrier-to-noise ratio (C/N0) reported from the mobile device to determine its receive radiation pattern. An RSS linearization step is then performed to “calibrate” the reported signal strength and correct the pattern shape. Finally, an effective isotropic sensitivity search is performed at a single point on the pattern and normalized with the remaining pattern data to produce a full TIS pattern. This same test methodology can be used on other wireless protocols that support receive signal strength indication, including GSM and UMTS, to reduce TIS test times.

The provided EMQuest™ EMQ-100 Antenna Measurement Software also performs the Intermediate Channel Degradation test required to determine the effect of the cellular radio transmissions on the GPS receiver sensitivity. Measured performance parameters for A-GPS include TIS, Upper Hemisphere Isotropic Sensitivity (UHIS) and Partial Isotropic GPS Sensitivity (PIGS).

AMS-8000 systems include an anechoic chamber, device under test (DUT) positioning equipment, measurement and communication antenna, instrumentation, and EMQuest automated measurement software. Customers may also obtain optional audit assistance for their ISO 17025 and certification program audits. Optional assistance can include help with preparation of operating procedure and measurement uncertainty documents, and performance of a trial audit.

About Us

ETS-Lindgren has been manufacturing antennas and antenna measurement systems since the 1960’s. In 2000, ETS-Lindgren began developing systems for wireless over the air performance testing. In 2002, ETS-Lindgren became the first CTIA Authorized Test Lab (CATL) for Mobile Station Over the Air Performance Testing. Since then, ETS-Lindgren has supplied the OTA systems for over 80% of all CATLs. The company has also developed the RPT systems used by the majority of WiMAX Forum™ certification laboratories.

Typical A-GPS OTA Test System Shown with Optional Equipment

Typical A-GPS OTA Test System Shown with Optional Equipment 

Standard Configuration

  • ETS-Lindgren RF-shielded Anechoic Chamber, Including RF Shielding, Absorber and Installation
  • ETS-Lindgren Multi-Axis Positioning System (MAPSTM) with Both Light and Medium Duty Masts
  • Head and Hand Mounting Kit for Medium Duty Mast
  • Hand Only Mounting Kit for MAPS
  • SAM Phantom head
  • Four (4) Hand Phantoms as per CTIA Version 3.0 plus Carrying Case
  • CTIA Ripple Calibration Antenna RF Cable and Mount Kit
  • RF Cables For Test System Integration
  • ETS-Lindgren Model 2090 Positioner Controller
  • ETS-Lindgren Model 3164-08 Quad Ridge Horn Antenna, 700 MHz to 10 GHz Frequency Range
  • ETS-Lindgren Model 3102L Conical Log Spiral Communications Antenna Mounted on Ceiling Above MAPS
  • ETS-Lindgren Model 3126-1575 Precision Sleeve Dipole, 1425 MHz - 1725 MHz
  • ETS-Lindgren Model 3127-1575 Precision Center-Fed Loop, 1575 MHz
  • 5-Beam Laser with Tripod
  • Dell Computer with U.S. Version of Microsoft Windows™ Operating System with Display
  • ETS-Lindgren EMQuest™ EMQ-100 Antenna Measurement Software, Includes Three Optional Equipment Drivers and Protocol Drivers for A-GPS
  • Software Support for 1 Year
  • Limiting Amplifier
  • Shield Test per MIL-STD 285/ IEEE 299 at 1 GHz
  • Quiet Zone Ripple Test and Range Calibration at 1575.42 MHz, With Positioner System in Place as per CTIA OTA Test Plan
  • Integration of Test System Components and EMQuest Software Training for Lab Personnel


  • Rack for Test System
  • Heavy Duty MAPS
  • Laptop Mount for Medium Duty MAPS
  • Switch Module
  • Shielded control room
  • Agilent GS-9000 Instrumentation for A-GPS:
    -- 8960 Cellular Communication Test Set
    -- E4438C Vector Signal Generator
  • Rohde & Schwarz Instrumentation for A-GPS:
    -- CMU 200
    -- SMU
  • Spirent 8100 Test System for A-GPS:
    -- ULTS (UMTS Devices)
    -- PLTS (CDMA Devices)
Tel +1.512.531.6400 Tel +358.2.8383.300 Tel +44(0)1438.730700 Tel + Tel +8610.8275.5086 Tel+ 81.3.3813.7100
Fax +1.512.531.6500 Fax +358.2.8651.233 Fax +44(0)1438.730751 Fax + Fax +8610.8275.5537 Fax +81.3.3813.8068

Information presented is subject to change as product enhancements are made. Contact ETS-Lindgren Sales Department for current specification.