Test Solutions

GPS Test Solutions

Over the years a number of schemes have been developed to mitigate the effects of jamming and also the effects of unintentional interference effects. Testing such schemes requires specialized systems which stimulate the unit under test with GPS and simulated jamming/interference signals.

A-GPS offers significant performance advantages over autonomous GPS, particularly at low power levels often associated with consumer applications. Testing should simulate both UE-Based and UE-Assisted operating modes and synchronization to other systems such as network location servers. Conformance testing is often in accordance with standards from organizations such as 3GPP (IS-916), the Open Mobile Alliance (OMA) and leading carriers.

Tight cost constraints and a difficult signal environment conspire to make in-vehicle navigation system testing one of the most challenging GPS applications. Increasingly, designers are turning to hybrid systems using other dead reckoning (DR) sensors to complement satellite-derived positioning.

China's Global Navigation Satellite System, BeiDou, will provide both commercial and military navigation services utilizing 30 MEO satellites and five GEO satellites.

Spirent is an official provider of test systems to support the development and in-orbit validation of the Galileo project. Spirent's systems are being used to verify the Ground Mission Segment and Test User Segment receivers. Spirent is also involved with offering pre-Galileo receiver and technology development tools to support research and development activities.

We currently have a test product for receivers of the Russian GLONASS constellation at the L1 frequency and are developing an L1/L2 variant. Many of our customers use GLONASS in conjunction with GPS and have our integrated GPS/GLONASS test solution. The need for integrated GPS/GLONASS/Galileo testing is highly anticipated in the future.

Spirent's GPS simulators support testing of systems with up to 32 satellites at L1, L2 and L5 with C/A, L2C and SBAS codes. Classified testing using SAASM, Y-code and M-code signals can also be supported for authorized customers. We have a wide range of products offering simple single channel L1 C/A code testing all the way up to multi-chassis, multi-frequency, multi-code solutions.

An Inertial Navigation System (INS) provides position, velocity, orientation and angular velocity by measuring the linear and angular accelerations applied to the system. Spirent offers a number of systems designed to simulate the inertial sensor outputs coherently with simulated GPS RF, thus enabling the inertial receiver elements to be tested. In addition, Spirent has a turntable option available for stimulation of embedded inertial sensors, again coherent with simultaneous GPS simulation.

The Local Area Augmentation System (LAAS) allows a suitably equipped receiver to derive enhanced accuracy and integrity information in a local area, an airport, for example, to meet the stringent requirements necessary to land a commercial aircraft. We have a product which provides the VHF Data Broadcast (VDB) messages which, when used in conjunction with GPS RF, allow testing of LAAS systems.

The accuracy and integrity of GPS can be greatly enhanced by the use of information derived from observations on the ground in the area of interest to the GPS user. Wide Area Augmentation System (WAAS) provides GPS users with this enhancement provided that their receiver is capable of processing the WAAS signal.
Spirent offers proven and delivered test solutions for commercial, military and modernized navigation systems

   Spirent offers proven and delivered test solutions
   for commercial, military and modernized
   navigation systems

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