SPIRENT SimINERTIAL Integrated gPS/InertIal teSt Introduction Spirent SimInertIal Inertial test Systems The testing of an Inertial navigation sensor presents a major The GSS8000 GPS simulator range uses Spirent’s state-of-the-art TM challenge in its own right, even before considering GPS integration. SimGEN application and modelling software to define and control The linear and angular sensors are usually characterised separately the test environment. This fully flexible tool is easy to use and is using centrifuges and angular rate tables respectively. Some equipped with a comprehensive range of trajectory generators limited integrated navigation testing can be performed using rate as well as supporting true hardware-in-the-loop applications via tables equipped with a lever arm but establishing full operational acceptance of external vehicle motion data in real time. performance usually requires expensive and time-consuming field SimINERTIAL is housed in a PC platform equipped with the test on an appropriate moving vehicle platform. appropriate data interface card. The simulated motion data is TM streamed from SimGEN via Ethernet to SimINERTIAL, which To reduce the need for field trials, operational performance of translates this simulated motion data into representative real-time an Integrated GPS/Inertial (IGI) system can be established in data streams at the data rate and with the data format appropriate the laboratory using a GPS RF Constellation simulator, such as to the unit being tested. Spirent’s GSS8000 product, along with a real-time emulation of the inertial sensor outputs that are coherently generated to SimINERTIAL is equipped with fully user-configurable sensor error exactly match the simulated GPS vehicle trajectory. Typical Inertial modelling and supports a range of popular Inertial formats via a sensor performance regarding bias and drift, for example, can be number of separately priced variants. All variants adopt the same established using traditional techniques, and then represented basic architecture as shown in Figure 1. by a sensor error model driven by the simulated motion with appropriate coefficients entered by the user. It is often necessary to All SimINERTIAL solutions are also equipped to deliver a barometric TM provide an altitude reference for Inertial-only navigation, such as a altitude output via a MIL-STD-1553B card installed in the SimGEN pressure altitude input. controller PC. The key benefit of this approach is that the stimuli to the navigation Control and data monitoring of the unit-under-test would normally algorithms, in the form of GPS pseudorange measurements made be via the user’s own instrumentation interface. Spirent’s optional by the GPS receiver under test and the emulated linear delta- SimDATA product can also be used to fulfil core control and display velocity and angular delta-theta inertial sensor outputs, are under unit (CDU) functions. SimDATA may user control in the lab and are extremely repeatable. This allows be specified with either 1553B or fine-tuning and debugging of the navigation algorithms across a RS422 interfaces. range of operational test scenarios. Spirent’s SimINERTIAL architecture For hybrid navigation sensors that are fully integrated into a is also available in configurations single unit, (such as Northrop Grumman’s LN100 and Honeywell’s to support transfer alignment and H-764G) the manufacturer will often provide a suitable test input multiple sensor architectures. port to accept the emulated sensor data streams, bypassing the physical sensors in the unit under test. For GPS/Inertial systems that have the Inertial Measurement Unit (IMU) and GPS in physically separate units, all that is required is to substitute the IMU with an inertial sensor stream conforming to the IMU’s defined data output interface, typically RS422 serial. SimINERTIAL testing at Spirent’s facility SPIRENT SimINERTIAL Integrated gPS/InertIal teSt Supported Variants egIs The SimINERTIAL architecture is readily adapted to other inertial TM ¢ Honeywell H-764G, SIGI and NAV100 IMU sensor simulations. Interfacing is via Honeywell’s proprietary Inertial Sensor Recorder Simulator ISRS2 card Please contact Spirent for more detailed information to meet your specified testing requirements. ¢ Northrop Grumman LN100G, LN250, LN251 and LN260 EGIs Interfacing is via the supplied RS422 card Product Specifications MS3008, MS3030, MS3033 and MS3034 IMU Emulation refer to the capabilities in this information sheet and are available ¢ Honeywell HG-1700, HG-1900 and HG-9900 on request. (as used in JDAM, for example) ¢ Northrop Grumman LN200 Performance figures and data in this document are typical and must be specifically confirmed in writing by Spirent ¢ AMRAAM-compliant Communications plc. before they become applicable to any ¢ NATO STANAG 4572 particu- lar order or contract. Interfacing is via the supplied RS422 card The publication of information in this document does not imply ¢ AIS SilMUO2 and SiNAV02 freedom from patent or other rights of Spirent Communications plc. Summary or others. Spirent supports Integrated GPS and Inertial performance testing by combining its powerful and flexible GPS simulation systems with For current product data, visit the Spirent websites at www.spirent. coherently generated inertial sensor delta-theta and delta-velocity com/positioning or www.spirentfederal.com data. Figure 1 Typical SimINERTIAL system configuration SALES AND INFORMATION Spirent Communications plc, Aspen Way, Paignton, Devon TQ4 7QR, UK T: +44 1803 546325 globalsales@spirent.com www.spirent.com/positioning US Government & Defense: Spirent Federal Systems Inc. 22345 La Palma Avenue, Suite 105, Yorba Linda, CA 92887 T: +1 714 692 6565 info@spirentfederal.com www.spirentfederal.com © 2012 Spirent Communications plc. All of the company names and/or brand names and/or product names referred to in this document, in particular the name “Spirent” and its logo device, are either regis- tered trademarks or trademarks pending registration in accordance with relevant national laws. All rights reserved. Specifications subject to change without notice. MCD00160 Issue 1-02 02/12