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SDI-151 is a North seeker with digital display,constituted with dual degree of freedom dynamically tuned gyro,mechanical transmission and signal decoding circuit.Dual degree of freedom gyro has two basic features, procession and stable spin axis .Rotation axis of gyro remains the orientation relative to inertial space, oppositely, the earth rotates for its angular velocity . If take the earth as standard, the gyro's axis will be found rotating relative to the earth. Therefore, the gyro can track and measure the angular velocity of the earth.North seekers take advantage of this different component of angular velocity on X and Y axis, then get the reference axis position info/then get the system's position info by the rate difference on X and Y sensitive axis.

Feature 
1.Easy to operate
2.Automated north-seeking
3.With digital display
4.Meet vehicle-mounted environment

Applications
1.Antenna positioning
2.Vehicle positioning
3.Radar positioning

Performance
Azimuth measurement range    0°~360°
Azimuth measurement accuracy    0.06°1σ
Azimuth resolution        0.01°
North seeking time    3min
Prepare time    10min
Operation state    static
Tilt angle measurement range(option)    ±8°
Tilt angle measurement accuracy(option)    ±0.06°
Digital display    LCD

Communication ports
Serial ports    RS-422/RS-232
Baud rate    9600bps

Environmental
Operating temp    -40ºC~60ºC
Bump    3g   8~11ms half-sine wave

Electrical
Input voltage    24~36VDC
Operating current    1A

Physical
Size    180×170×185 mm
Weight    <10kg