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Topic: Inertial Measurement Unit

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	Inertial Measurement Unit - Wikipedia, the free encyclopedia
		An Inertial Measurement Unit is a closed system that is used to detect attitude location and motion.
		Because an IMU is continually adding detected changes to the current position, any error in the measurement is accumulated.
		The term IMU is widely used to refer to a box, containing 3 accelerometers.
	en.wikipedia.org /wiki/Inertial_Measurement_Unit (588 words)

	Inertial measurement unit with aiding from roll isolated gyro - Patent 5067084
		In the present invention the inertial measurement unit system comprises a basic strapdown inertial measurement unit and an isolated fourth gyro strapped to a rotatable platform which is commanded to rotate at a rate equal to the spin rate of the vehicle body but in an opposition direction.
		A signal processing means operates on (i) the output of an inertial navigational system computer representative of the rate of rotation of the inertial measurement unit along the roll axis, (ii), the output of the isolation gyro, and (iii) an output of a counter which counts the complete revolutions of the rotatable platform.
		In the present invention the inertial measurement unit system comprises a basic strapdown inertial measurement unit and an isolated fourth gyro placed on a rotatable platform which is commanded to rotate at a rate equal to the spin rate of the vehicle body but in an opposite direction.
	www.freepatentsonline.com /5067084.html (2511 words)

	Inertial guidance system (Site not responding. Last check: 2007-10-15)
		A typical inertial navigation system uses a combination of accelerometers, and solves a large set of differential equations to convert these readings into estimates of position and attitude, starting off from a known initial position.
		Inertial navigation may also be used to supplement other navigation systems, providing a higher degree of accuracy than is possible with the use of any single navigation system.
		Inertial guidance systems are now usually combined with satellite navigation systems through a digital filtering system.
	www.hallencyclopedia.com /Inertial_guidance_system (1762 words)

	Inertial Measurement Unit (IMU)
		The IMU is a single unit in the electronics module which collects angular velocity and linear acceleration data which is sent to the main processor.
		This is due to the fact that the two sensors in the IMU are mounted in two different orientations in the housing, along with the fact that the axes of the IMU are not aligned with the vehicle axes.
		Using this information, along with knowledge of the orientation with which the IMU is mounted to the wall of the EM allows the formation of a direction cosine matrix that is used to convert the measurements from the IMU coordinate frame to the vehicle coordinate frame.
	www.ssl.umd.edu /projects/RangerNBV/thesis/2-4-1.htm (640 words)

	The desire for a fully independent system led to the design of a 14-inch long, 0 (Site not responding. Last check: 2007-10-15)
		Inertial systems provide an entirely automatic means of determining position for vehicles and weapons alike, and have a wide range of application from underwater to space environments.
		In this process, known distances traveled by the vehicle and their respective measured directions, determined by the accelerometers and gyros, are added to the estimated starting point in order to develop a track of the vehicle over time.
		Before the competition, the IMU will require further calibration in order to provide the most accurate positioning data available; this will be the focus of the guidance effort for the next two months leading up to the competition.
	www.usna.edu /AUVT/IMU.htm (1086 words)

	GUIDANCE, NAVIGATION AND CONTROL
		Actual attitude is derived from inertial measurement unit angles, aerosurface position is provided by feedback transducers in the aerosurface servoamplifiers, body rates are sensed by rate gyro assemblies, and accelerations are sensed by accelerometer assemblies.
		The velocity data measured by the IMU are the primary sources that propagate the orbiter state vector during ascent and entry.
		IMU alignment is accomplished by using the star trackers to measure the line-of-sight vector to at least two stars.
	science.ksc.nasa.gov /shuttle/technology/sts-newsref/sts-gnnc.html (11375 words)

	IMU (Site not responding. Last check: 2007-10-15)
		The accelerometers are measuring the earth gravity and the acceleration caused by changes in movement speed of MARVIN.
		Measuring the accelerometers is easy because a constant acceleration is available everywhere, earth gravity, and the angle between sensor and ground can be measured.
		A problem is, that the direction the helicopter is facing to, cannot be measured by an accelerometer and an uncompensated gyroscope drifts too much, therefore we needed a compass.
	user.cs.tu-berlin.de /~remuss/marvin_imu.html (389 words)

	Apparatus and method for determining velocity of a platform - Patent 5787384
		The resultant acceleration measurement and the GPS navigation data are used to calculate the velocity of the platform in conjunction with a second Kalman filter for removing GPS systematic errors that are normally removed by use of a ground reference station.
		An inertial measurement unit is located at the platform for outputting inertial navigation data relating to the inertial movement of the platform.
		Inertial navigation data is generated at step 214 from the inertial movement measured by the IMU 12.
	www.freepatentsonline.com /5787384.html (5290 words)

	Compact Inertial Measurement Unit (Site not responding. Last check: 2007-10-15)
		A pair of small, wireless, handheld, 6-axis inertial measurement units (as shown here) were constructed to capture gesture and test this framework.
		An Inertial Measurement Framework for Gesture Recognition and Applications, Ari Y. Benbasat and Joseph A. Paradiso.
		An Inertial Measurement Unit for User Interfaces, Ari Y. Benbasat, MS Thesis, MIT Media Lab, September 2000.
	www.media.mit.edu /resenv/imu.html (332 words)

	NEWS PACKAGE: The Cox Report [www.thesunlink.com]
		Rather than basing their claims of the inertial measurement unit’s reliability on the more slender record of space launches alone at the time the Long March was first offered to foreign customers for launch services, the PRC may have offered this information to enhance the record of reliability of the inertial measurement unit.
		Thus, the Long March 3B inertial measurement unit, as described and displayed by the PRC participants, is an essentially different subsystem from the inertial measurement unit of the Long March 3.
		Further, the failure in the inertial measurement unit was ascribed by the PRC participants to the loss of current to the torque motor of the inner frame gimbal axis.
	web.kitsapsun.com /packages/coxreport/aftertech.html (6049 words)

	Inertial measurement unit - Patent 4711125
		An inertial measurement unit which provides three axis acceleration and angular turning rate detection with a cubical magnetically suspended sensor mass disposed within a cubical outer assembly.
		Inertial navigation has long been recognized as an advantageous method of navigation inasmuch as no external reference is required.
		An accelerometer is a device that measures the acceleration of the vehicle in one direction relative to the stabilized frame or reference.
	www.freepatentsonline.com /4711125.html (5769 words)

	Inertial Measurement Unit (IMU) (Site not responding. Last check: 2007-10-15)
		The purpose of the IMU is to measure the total accelerations acting on and generated by the vehicle, the angular velocity of the vehicle, and report these to the main processor.
		The accelerometer and angular rate sensor triads are located within the IMU housing.
		The IMU is located in the upper port rear of the electronics module.
	www.ssl.umd.edu /Projects/RangerNBV/thesis/2-5-5.htm (121 words)

	Northrop Grumman Navigation Systems Division (Site not responding. Last check: 2007-10-15)
		The IMU 600 is a small, high-performance inertial sensor incorporating three FOG 600s and three accelerometers.
		The IMU 600 (0.01 deg/hr typical in-run drift stability) is designed for applications requiring higher accuracy than the IMU 200.
		A version of this IMU is deployed successfully aboard the F/A 18 fighter aircraft as part of the Advanced Targeted Forward Looking Infra-red (ATFLIR) program.
	www.ngnavsys.com /Html/IMU600 (69 words)

	3X IMU
		In hopes of moving beyond ad hoc gesture recognition method, we are building a generalized framework for filtering IMU data and using it for gesture recognition.
		While there are many three axis inertial measurement units on the market, most of them fail to meet our requirements.
		The acceleration is measured with two-axis Analog Devices ADXL202 MEMS accelerometers.
	www.media.mit.edu /resenv/imu (1093 words)

	Embedded inertial Measurement Unit (EiMU) (Site not responding. Last check: 2007-10-15)
		This is the on-line manual for the Embedded inertial Measurement Unit (EiMU), pronounced "emu" (like the bird).
		Below the processor board is the magnetometer board and above is the inertial sensor block.
		The inertial sensor block is a precision machined block of magnesium (very light weight 16g) that has five small circuit boards each containing an inertial sensor chip.
	www.cat.csiro.au /cmst/automation/eb/doc/eimu (660 words)

	Technical Afterword (Site not responding. Last check: 2007-10-15)
		March 3B failure was in the inertial measurement unit, and this was not cause for concern for the
		the failure was in the inertial measurement unit.
		measurement was flat, and remained skeptical of the PRC explanations for this anomaly
	www.house.gov /hunter/CoxReport-tech.htm (6398 words)

	MT6 Inertial Measurement Unit (Site not responding. Last check: 2007-10-15)
		The MT6 is a miniature inertial measurement unit, providing serial digital output of 3D acceleration data and 3D rate of turn (gyro) data.
		The MT6 is a miniature digital inertial measurement unit that measures 3D rate-of-turn and acceleration.
		The MT6 can easily be integrated in any system or application in biomedical and industrial applications, for measurement of body motion, balance and stabilization, navigation or control.
	www.omniinstruments.co.uk /gyro/imu_mt6.html (174 words)

	GPS World: Inertial measurement unit (Site not responding. Last check: 2007-10-15)
		Javad Navigation Systems Inc. recently unveiled its JNS inertial measurement unit (IMU) for use as an independent navigation device or for integration with multiple sensors.
		If the JNS IMU is combined with the JNSGyro-4 GPS receiver, the system can provide position accuracy of about 1.0 meter (3D rms) in stand-alone mode and approximately 0.005 meter (3DD rms) in the carrier phase differential mode.
		The JNS IMU combines a three degree-of-freedom gyro, three accelerometers with a processing communication board in a water-resistant aluminum housing.
	www.findarticles.com /p/articles/mi_m0BPW/is_8_15/ai_n6159923 (223 words)

	Inertial Measurement Unit Opens New Market Opportunities for KVH
		Measuring motion and acceleration precisely in three dimensions, the TG-6000 is ideal for applications that involve flight control, orientation, instrumentation, or navigation, such as torpedoes, smart munitions, and unmanned aerial vehicles.
		This highly reliable, strap-down inertial subsystem provides accurate measurement of angular rate and linear acceleration and achieves its excellent performance by employing proprietary algorithms to characterize and correct for the effects of temperature, linearity, and misalignment.
		KVH FOGs are used in diverse applications including IMUs for torpedos, precision tactical navigation systems for military vehicles, and image stabilization and synchronization for shoulder- or tripod-mounted weapon simulators.
	www.spacedaily.com /news/gps-03zd.html (509 words)

	LN-200 Inertial Measurement Unit (IMU)
		The LN-200 Inertial Measurement Unit (IMU) has been in high rate production since 1994.
		It is the latest in applied technology, utilizing state-of-art inertial fiber optic gyros and micro-machined accelerometers.
		The LN-200 IMU is produced in a fully complemented and highly robotic production facility.
	www.nsd.es.northropgrumman.com /Automated/products/LN-200.html (44 words)

	Observer-based coplanar gyro-free IMU
		This paper presents a novel design of a coplanar gyro-free inertial measurement unit (IMU) that consists of seven to nine single-axis linear accelerometers, and it can be utilized to perform the six DOF measurements for an object in motion.
		The alignment error from positioning accelerometers onto a measurement unit and the fabrication cost of an IMU can greatly be reduced.
		The sensing resolution of a gyro-free IMU depends on the sensing resolution of the employed accelerometers as well as the size of the measurement unit.
	stacks.iop.org /0960-1317/15/1664 (374 words)

	HT Inertial Measurement Unit
		At the heart of the Segway™ Human Transport is an Inertial Measurement Unit (IMU).
		We worked closely with the Segway™ engineering team to redesign the circuitry to include two microcomputers, which eliminated many discrete components, and to redesign the interfaces.
		Finally the design was transferred to Silicon Sensing Systems, who supplied the gyroscopes and mechanical hardware, for contract manufacturing.
	www.updesigns.com /inertial_measurement_unit1.htm (92 words)

	IMT Partners with L-3 Communications for MEMS-based Inertial Measurement Unit (Site not responding. Last check: 2007-10-15)
		The advanced Low-cost, High-G MEMS IMU device is an upgrade in performance to the currently implemented laser ring gyros at a fraction of the size and cost with huge improvements in robustness that allow survivability after 25,000 G shocks.
		John Foster, IMT's CEO added, "L-3 and IEC are well-known for their state-of-the-art global positioning system (GPS) and we are proud to be partnering with them on the IMU that will be coupled to that GPS.
		We think our unique suite of capabilities is an excellent match for the stringent requirements of this device and for manufacturing it economically and with high quality.
	www.memsnet.org /news/1033575476-1 (414 words)

	MSNBC
		They were also shown, in a partially opened state, units described by the PRC as the older Long March 3 inertial measurement unit and the newer Long March 3B inertial measurement unit.
		The PRC officials stated that they believed the failure mode was located in the inertial guidance system of the Long March 3B rocket.104 Specifically, they believed the failure was caused by a break in a wire to a torque motor controlling the inner gimbal in the inertial measurement unit.
		Its disadvantage would be that the Long March 3B inertial measurement unit would require modification to be rugged enough for use on the road-mobile DF-31.
	www.msnbc.com /specials/coxreport/6_victory.htm (17646 words)

	Measurement unit, inertial measurement unit, density measurement unit (Site not responding. Last check: 2007-10-15)
		Measurement unit, inertial measurement unit, density measurement unit
		Density measurement unit Strange unit of measurement Inertial measurement unit International measurement unit Length measurement metric unit Converting unit of measurement Unit of liquid measurement Light measurement unit Standard unit of measurement Ancient unit of measurement
		Measurement reference unit Measurement table unit Measurement unit unusual Mass measurement unit Metric unit of measurement Unit of measurement Measurement pressure unit Time measurement unit Basic measurement unit Measurement unit weight
	www.rentalday.com /measurement-unit.html (214 words)

	MEMS-based IMU (Inertial Measurement Unit)
		An Inertial Measurement Unit (IMU) provides full six-degree-of-freedom (6DOF) motion sensing for applications such as navigation and control systems.
		Angular rate and acceleration are measured about three orthogonal axes.
		The Crossbow IMU300 and IMU400 are solid-state IMUs utilizing the latest MEMS micro-machined sensing technology combined with digital signal processing to provide reliable, easy-to-use inertial systems in a small, lightweight package.
	www.xbow.com /Products/productsdetails.aspx?sid=26 (82 words)

	GPS World: Inertial Measurement Unit (Site not responding. Last check: 2007-10-15)
		The Multisensor Inertial Measurement Unit (MIMU) from BAE Systems provides fully compensated measurements of vehicle angular rates and linear accelerations that are suitable for stabilization, navigation, autopilot guidance, and control.
		The inertial sensing elements include two multi-sensor gyro-accelerometers, with spin axes 90 degrees to each other mounted on an internal sensor block.
		Autopilot/stabilization data are transmitted at an 1800 Hz rate in both analog and digital format, and inertial quality data are transmitted at an 100 Hz rate.
	www.findarticles.com /p/articles/mi_m0BPW/is_3_16/ai_n13471760 (195 words)

	Schoolforge News Journal - Mars
		Angular rate measurements are used to determine yaw attitude during the Mapping Phase.
		The Thermal Emission Spectrometer (TES) measures infrared radiation, and is used to determine the general mineral composition of patches of ground as small as 9.0 square km.
		RSS measurements include radio tracking of the spacecraft to improve the gravity field model of Mars and radio occultation observations to study the structure of the atmosphere [Tyler et al., 1992].
	opensourceschools.org /article.php?story=20030421045650984 (6100 words)

	Cloud Cap Technology -- Crista IMU
		The Crista Inertial Measurement Unit is a very small three axis inertial sensor that provides high resolution digital rate and acceleration data via serial interfaces.
		The Crista IMU does not provide a calculated attitude solution, but rather provides temperature compensated raw rate and acceleration data for the host algorithms.
		The Crista IMU Serial Developers Kit (p/n 900-90006-00) contains an IMU, a bench test harness, serial cable, and CD-ROM that contains documentation and software test and demo tools.
	www.cloudcaptech.com /crista_imu.htm (233 words)

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