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Related Manuals for WATSON INDUSTRIES AHRS-E304
Summary of Contents for WATSON INDUSTRIES AHRS-E304
- Page 1 ATTITUDE AND HEADING REFERENCE SYSTEM OWNER'S MANUAL PART NUMBER: AHRS-E304 WATSON INDUSTRIES, INC. 3041 MELBY ROAD EAU CLAIRE, WI 54703 Phone: (715) 839-0628 FAX: (715) 839-8248 email: support@watson-gyro.com AHRS-E304 Watson Industries, Inc 09/06/05...
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Page 2: Table Of Contents
OUTPUT FLAGS................................8 RS-232 INPUT COMMANDS............................8 ANALOG INPUTS ...............................9 INPUT LOGIC COMMANDS............................10 CONNECTIONS .................................11 WARNING..................................12 Appendix A .................................15 Appendix B..................................16 DETERMINING & SETTING OUTPUT CHANNELS ..................16 ADJUST TIME CONSTANTS ..........................17 SETTING OUTPUT FORMAT ..........................17 Appendix C..................................17 AHRS-E304 Watson Industries, Inc 09/06/05... -
Page 3: Introduction
Aircraft attitude and heading gyros need frequent correction to compensate for the 15º per hour of earth rotation. Watson Industries has produced a solid state gyro system, which models these functions for an attitude gyro and a slaved heading gyro. This system uses a microprocessor to integrate angular rate sensor data and provides a closed loop system of error correction to adjust biases from earth rotation and from instrument offsets. -
Page 4: Environment
Symmetry is very important in such mount designs (consult Watson Industries for application notes on this if needed). Environment: High level AC magnetic fields, such as from large transformers, motors, or soldering guns, are to be avoided as being potentially damaging to the circuitry, even if the system is not powered. -
Page 5: Specifications
(error correction is reduced or switched off during extreme maneuvers) 10) Error growth when error correction is switched off will be about 0.03º/second 11) No attitude limits (however, errors are likely to grow rapidly within 5º of vertical in elevation) *Assumes accurate velocity data AHRS-E304 Watson Industries, Inc 09/06/05... -
Page 6: Rs-232 Output Format
±799.9 Km/hr. The string is terminated by a carriage return. There will then be a short interval with no data transmission before the next string begins. AHRS-E304 Watson Industries, Inc 09/06/05... - Page 7 (in this case the rate would be 71.11 Hz) by using special commands to modify the EEPROM of the unit. This format is for highly experienced users only. Consult the factory for further details. AHRS-E304 Watson Industries, Inc 09/06/05...
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Page 8: Analog Outputs
This will also disable the logic input Reference Command, Coast Mode Command and Invalid Velocity Command until the next time the unit is powered up. Double spacebar at initialization is required for access to this command. AHRS-E304 Watson Industries, Inc 09/06/05... -
Page 9: Analog Inputs
The four analog user inputs as well as the velocity input have one megohm input impedance, 16 bit A/D conversion resolution, ±10 volt input range and have a bandwidth of DC to 25 Hertz. AHRS-E304 Watson Industries, Inc 09/06/05... -
Page 10: Input Logic Commands
INPUT LOGIC COMMANDS To aid in alignment and testing, the AHRS-E304 is equipped with a Reference Command input. By grounding this pin (pin 13), the mode of the unit is changed so that the pendulums and magnetometer generate the output in place of the usual gyro outputs. When not in use the pin is to be left unconnected. -
Page 11: Connections
Velocity Input Command Reference Output Command Heading North Heading South Bank Elevation Forward Velocity Analog Input User Channel 3 Input Heading Rate Roll Rate User Channel 4 Input Pitch Rate Yaw Rate Coast Mode Command FORWARD AHRS-E304 AHRS-E304 Watson Industries, Inc 09/06/05... -
Page 12: Warning
The non-magnetic connectors supplied with the unit must be used to preserve heading accuracy. The user must use non-magnetic hardware to install the unit. This unit should be protected against prolonged exposure to high humidity and/or salt air environments. AHRS-E304 Watson Industries, Inc 09/06/05... - Page 13 DISCLAIMER The information contained in this manual is believed to be accurate and reliable; however, it is the user's responsibility to test and to determine whether a Watson Industries' product is suitable for a particular use. Suggestion of uses should not be taken as inducements to infringe upon any patents.
- Page 14 SERVICE Watson Industries, Inc. has no service outlets. All service is performed at the factory. In order to insure prompt service, prior to returning a unit for repair please call, write or fax: Watson Industries, Inc. 3041 Melby Road Eau Claire, WI 54703...
- Page 15 ±10 VDC User Channel 4 ±9.99 VDC ±10 VDC Forward Velocity ±799.9 Km/hr ±800 Km/hr Temperature -40º to 88ºC -40º to 88ºC (7 bit) Status Bits 1 byte 1 byte Flag Bits 1 byte 1 byte AHRS-E304 Watson Industries, Inc 09/06/05...
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Page 16: Determining & Setting Output Channels
DO YOU WANT TO TRY TO SET DATA AGAIN? To accept channels type 'N', then hit space bar output data to resume. To make this channel selection the default the next time you power the unit on type in'"' (double quote) AHRS-E304 Watson Industries, Inc 09/06/05... -
Page 17: Adjust Time Constants
All of the data words have a high sign bit, but the delimiter byte is an ASCII carriage return character which has a low sign bit. The nominal interface settings are: 9600 Baud 8 Bit Data 1 Start Bit 1 Stop Bit No Parity AHRS-E304 Watson Industries, Inc 09/06/05...