Strapdown Heading Reference
SHR-360
Description:
The SHR-360 provides heading and sensor information. It includes a high
accuracy triaxial fluxgate magnetometer
and a triaxial accelerometer. This unit is a "strapdown" or "body-axis" sensor. The
sensitive axes of the magnetometer (like the accelerometers) will stay at a constant
relationship with the vehicle and move as the vehicle moves. Since the fluxgate sensors
rotate with the unit, the unit must use its angle sensors to calculate the rotation back
to level. The function is similar to a mechanical gimbal except that the rotations are
done using software. The SHR-360 has several advantages over using a traditional gimbal
including: no bearings to wear out, no fluid to leak and high shock survivability.
The Watson Industries strapdown solution provides a better magnetic
heading than other magnetic heading products using mechanical gimbals. A significant
problem with mechanically gimbaled compasses becomes apparent when trying to calibrate
the heading sensor in the field. With a strapdown system, the magnetometers are fixed
with respect to the vehicle in which it is mounted; Therefore, the constant soft and
hard iron field distortions can be fully calibrated out.
Applications:
Strapdown systems provide superior performance in installations including
automobiles, ships, buoys and aircraft.
Features:
| • Solid State, Strapdown System |
| • Low Cost, Low Power |
| • Rugged, High Reliability |
| • Vibration Resistant |
| • Analog and RS-232 Serial Outputs |
| • PC Heading Calibration |
| • Two Year Limited Warranty |
| • Engineering Support |
Strapdown Heading Reference
SHR-360 Specifications |
Attitude |
| Range: Bank | ±180° |
| Range: Elevation | ±90° |
| Resolution: | 0.02° | Binary mode (14 bit) |
| Analog Scale Factor: | 18°/V | ±10V Output |
| Accuracy: Static | ±0.5° |
Heading |
| Range: | 0° - 360° |
| Resolution: | 0.02° | Binary mode (14 bit) |
| Analog Scale Factor: | 18°/V | ±10V Output |
| † | Accuracy: Static | ±1.5° |
| * | Accuracy: Dynamic | ±2% |
Acceleration |
| Range: X, Y, Z | ±10g |
| Resolution: | 4mg |
| Scale Factor Accuracy: | 1% |
| Bias: X, Y, Z | < ±5mg |
| Non-Linearity: | < 1% | Full scale range |
| Bandwidth: | 20 Hz |
Magnetic |
| Range: X, Y, Z | ±1000 mGauss |
| Resolution: | 0.1 mGauss | Binary mode (14 bit) |
| Scale Factor Accuracy: | 1% |
| Bias: X, Y, Z | < ±5 mGauss |
| Non-Linearity: | < 0.01% | Full scale range |
| Bandwidth: | 10 Hz |
Environmental |
| Temperature: Operating | -40°C to +85°C |
| Temperature: Storage | -55°C to +85°C |
| Vibration: Operating | 5g rms | 20 Hz to 2 kHz |
| Vibration: Survival | 10g rms | 20 Hz to 2 kHz |
| Shock: Survival | 500g | 10mS ½ sine wave |
Electrical |
| Frame Rate: | 71.1Hz | Maximum |
| Startup Time: Data | 5 sec |
| Startup Time: Fully operational | 10 sec |
| Input Power: | 10 to 30VDC | 3.6W |
| Input Current: | 300mA @ 12VDC | 150mA @ 24VDC |
| Digital Output: | RS-232 |
| Analog Output: | ±10VDC |
Physical |
| Axis Alignment: | < 0.25° |
| Size: Including Mounting Flanges | 3.24”W x 5.78”L x 2.6”H | 8.2 x 14.7 x 6.6 (cm) |
| Weight: | 22oz (1.4lb) | 620 grams (0.6Kg) |
| Connection: RS-232 | 9 pin female "D" subminiature |
| Connection: Power / Analog Outputs | 9 pin male "D" subminiature |
| * |
Actual accuracy can be calculated as the listed percentage multiplied by the change in value over the entire dynamic maneuver. |
| † |
Static heading accuracy is dependent on the magnetic environment. This sensor will meet or exceed this spec within the 48 contiguous United States. |
| Specifications are subject to change without notice. |
|
Strapdown Gyro SHR-360 Dimensions |
 |
Connector Pinout:
| 9 Pin Female D-Sub |
| RS-232 Serial Connector |
| Pin |
Description |
| 1 |
No Connection |
| 2 |
TXD** |
| 3 |
RXD |
| 4 |
Shorted to pin 6 |
| 5 |
Signal Ground |
| 6 |
Shorted to pin 4 |
| 7 |
Shorted to pin 8 |
| 8 |
Shorted to pin 7 |
| 9 |
No Connection |
| **User receives data on this line |
|
|
| 9 Pin Male D-Sub |
| Power & Analog Output Connector |
| Pin |
Description |
| 1 |
Power Ground |
| 2 |
+12 or +24 VDC In |
| 3 - 5 |
No Connection |
| 6 |
Bank Analog Output |
| 7 |
Elevation Analog Output |
| 8 |
Heading Analog Output |
| 9 |
Signal Ground |
|
