What is an IMU
The Applied Analytics record already described this topic in product notes. The figures below stay with those notes; later pages can add government source tables without changing the numbers.
Position and Attitude Data System (PADS) The Position and Attitude Data System (PADS) is a high accuracy, near real time, long range airborne direct georeferencing system. [1]
It integrates GPS and inertial sensor measurements using Kalman filtering techniques to precisely determine multiple target locations on the ground.
It consists of an Inertial Measurement Unit (IMU), GPS receiver, and Integration Computer System (ICS) running the Applied Analytics Real Time Navigator (RTN) software package.
Features Hardware/software for precision roll, pitch, heading and navigation Complete inertial navigation solution at IMU data rate (e.g.
200Hz, WGS-84) Initial heading and leveling alignment accomplished with Kalman Filter In-air alignment capability (re-start) Navigator calibrated with Multi-State Kalman filter using GPS observations UTC event timing to 1 microsec System Description Kearfott KI-4901 Inertial Measuremment Unit NovAtel ProPak-LB GPS system using Omnistar to achieve <0.2 m accuracy in real time QNX operating system Standard RS-422 IMU interface with data validity interrupt PADS/C, Ethernet controller Data can be collected for Post processing Removable I/O panel Swappable 1-36 VDC Volt Lambda Power Supply.
Industry standard VME power can be replaced with alternative units using any input power Easy to Read Power Supply Status Lights Removable/Replaceable Euro Card GPS receiver Space for additional 4HP Euro Card (Optional) Fully Functional Computer uses Ampro LB700 EBX processor with Sealevel PC-104 8 port communications Robust I/O connection availability.
The GPS Inertial Data Simulator (GIDS) The GPS Inertial Data Simulator (GIDS) is a dynamic testing tool for systems using imbedded Inertial Navigation Systems (INS) or GPS.
It is a low-cost, simulation-based alternative to physical testing that requires the actual movement of the system under test.
GIDS is a hardware device that simulates the dynamic motion of the GPS and INS, generates the required data streams (in real time) and provides the data to the system under test.
As a result, the test system believes it is moving in three dimensional space.
Features Real-time, GPS/Inertial Measurement Unit (IMU) simulator Configurable output data stream Use for dynamic GPS/IMU system checkout on the bench Configuration, control and monitoring via standard internet browser User defined flight profiles can be varied, or repeated indefinitel Data provided on multiple interfaces including serial, Ethernet, ARINC 429 or Mil Standard 1553 Message structure tailored to the user’s requirements, e.g., NovAtel GPS serial messages System Description Software hosted on Ampro Ready System ATX computer (11x7.9x4.5 inches, 115 VAC power) QNX Operating System configured for remote login for software service and upgrades Uses internal processor clock, or built in GPS receiver for real-time synchronization Uses internal processor clock, or built in GPS receiver for real-time synchronization Different interfaces provided via PC-104 cards Accuracy GPS position and velocity exactly synchronized with IPPS pulse and IMU delta Vs and delta Thetas The GIDS Family GIDS is a hardware device that simulates the dynamic motion of the GPS and INS, generates the required data streams (in real time) and provides the data to the system under test.
Integrated Navigation Systems combine GPS and inertial sensors with sophisticated software to yield extremely accurate locational information.
Most systems are designed from the ground up, with proprietary hardware and software.
The Real Time Navigator (RTN) is a generalized software package that allows you to define your own suite of GPS and inertial sensors without having to write custom software.
RTN speeds up system development by allowing you to use off-the-self sensors without costly software engineering.
Features RTN is a flexible software package that can be integrated with any GPS and IMU hardware Software separate from the Navigation software provides explicit interfaces to any IMU and any GPS Full Strapdown Inertial Navigation solution at IMU data rate (e.g., 200Hz, WGS-84) Initial heading and leveling alignment accomplished with Kalman Filter Built-in in-air alignment capability (re-start) Navigator and instruments calibrated with Multi-state Kalman filter using GPS observations UTC event imaging to 1 microsec Interfaces with user IMU via RS422 port, including data strobe Interfaces with user GPS via RS232 or RS422 port, including 1PPS data strobe System Description RTN software is written with C++ constructs and a unique Publish/Subscribe Class providing easy inter-process communications with alternative hardware suites Kalman filter tuned to specific user hardware elements QNX or VxWorks operating systems Accuracy Please contact us for more information Real Time Navigator Data Flow Diagram The Real Time Navigator (RTN) is a generalized software package that allows you to define your own suite of GPS and inertial sensors without having to write custom software.