Heading Reference SHR-360

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 mGaussBinary 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: Operating5g rms20 Hz to 2 kHz
Vibration: Survival10g rms20 Hz to 2 kHz
Shock: Survival500g10mS ½ sine wave

Electrical

Frame Rate:71.1HzMaximum
Startup Time: Data5 sec
Startup Time: Fully operational10 sec
Input Power:10 to 30VDC3.6W
Input Current:300mA @ 12VDC150mA @ 24VDC
Digital Output:RS-232
Analog Output:±10VDC

Physical

Axis Alignment:< 0.25°
Size: Including Mounting Flanges3.24”W x 5.78”L x 2.6”H8.2 x 14.7 x 6.6 (cm)
Weight:22oz (1.4lb)620 grams (0.6Kg)
Connection: RS-2329 pin female "D" subminiature
Connection: Power / Analog Outputs9 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

Heading Reference SHR-360

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


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