KVH Industries DSP-3000 User manual

DSP-3000
KVH®DSP-3000
Fiber Optic Gyro
Technical Manual

DSP-3000 Fiber Optic Gyro
Technical Manual
This manual provides detailed guidelines for the proper installation
and operation of the KVH DSP-3000 fiber optic gyro (FOG).
Throughout this manual, important information is marked for your
attention by these icons:
A helpful tip that either directs you to
a related area within the manual or
offers suggestions on getting the
highest quality out of your system.
An alert to important information
regarding procedures, product
specifications, or product use.
An electrical safety warning to help
identify electrical issues that can be a
hazard to either this KVH product or
a user.
Information about installation,
maintenance, troubleshooting, or
other mechanical issues.
Please direct questions, comments, or suggestions to:
KVH Industries, Inc.
50 Enterprise Center
Middletown, RI 02842-5279 USA
Tel: [phone]
Fax: [phone]
If you have any comments regarding this manual, please e-mail
them to [email protected]. Your input is greatly appreciated!
KVH Part # 54-0215 Rev. C
© 2005-2007 KVH Industries, Inc. All rights reserved.
Protected by U.S. and foreign patents

KVH®is a registered trademark of KVH Industries, Inc.

54-0215 Rev. C i
Table of Contents
1Introduction ........................................................... 1
1.1 Scope of this Manual.....................................................................1
1.2 Product Description ......................................................................1
1.2.1 Output Orientation ...............................................................5
1.2.2 Interface Connector .............................................................5
2Digital 100 Hz Asynchronous Interface............................ 7
2.1 Description ...................................................................................7
2.1.1 User Commands..................................................................8
2.2 Wiring the Gyro for Digital Asynchronous Operation ................9
2.2.1 Wiring Guidelines ................................................................9
2.3 Preliminary Testing .....................................................................10
2.3.1 Test Procedure ..................................................................10
3Digital 1000 Hz Asynchronous Interface .........................12
3.1 Description .................................................................................12
3.1.1 Message Structure ............................................................13
3.1.2 Message Content ..............................................................13
3.1.3 Message Rates..................................................................14
3.1.4 Synchronization .................................................................14
3.2 Wiring the Gyro for Digital Asynchronous Operation ..............15
3.2.1 Wiring Guidelines ..............................................................15
3.3 Preliminary Testing .....................................................................16
3.3.1 Test Procedure ..................................................................16
4Digital 1000 Hz Synchronous Interface...........................18
4.1 Description .................................................................................18
4.1.1 Message Structure ............................................................19
4.1.2 Message Content ..............................................................20
4.1.3 Message Rates..................................................................20

ii 54-0215 Rev. C
4.2 Wiring the Gyro for Digital Synchronous Operation ................21
4.2.1 Wiring Guidelines ..............................................................21
4.3 Preliminary Testing .....................................................................22
4.3.1 Test Procedure..................................................................22
5Analog Interface .................................................... 24
5.1 Description .................................................................................24
5.1.1 Analog Output Voltage Generation.................................... 24
5.1.2 Rate Scaling ......................................................................24
5.2 Wiring the Gyro for Analog Operation.......................................25
5.2.1 Wiring Guidelines ..............................................................25
5.3 Preliminary Testing .....................................................................27
5.3.1 Test Procedure..................................................................27
6Mounting the Gyro .................................................. 28
7Troubleshooting..................................................... 29
Appendix A Patent Protection*......................................... 30

54-0215 Rev. C 1
1 Introduction
1.1 Scope of this Manual
This technical manual supports KVH Industries’ DSP-3000 series fiber optic gyros with
digital or analog output. Technical and performance specifications, interfaces, installation
and testing guidelines, and a brief troubleshooting guide are included. This manual covers
the DSP-3000 model gyros with the following part numbers:
Table 1: Gyro Part Numbers
Part No. Output
02-1222-01 Digital, 100 Hz asynchronous
02-1222-02 Digital, 1000 Hz synchronous
02-1222-03 Analog
02-1222-04 Digital, 1000 Hz master synchronous
02-1222-07 Digital, 1000 Hz asynchronous
1.2 Product Description
The DSP-3000 is a single-axis interferometric fiber optic gyro for use in a wide range of
applications, including antenna and optical stabilization, navigation, positioning,
aerospace (AHRS), IMUs, robotics, and instrumentation. Based on proprietary
polarization-maintaining fiber and precision FOG technology, the DSP-3000 employs a
digital signal processor and an all-fiber, open loop optical circuit. The gyro measures
angular rate of rotation, which can be integrated to allow turning angle to be measured
accurately. Operating from a nominal 5 VDC, it outputs a digital or analog message with
input rates of up to ±375 degrees per second for digital versions, or ±100 degrees per
second for the analog version. The DSP-3000 is self-initializing and ready for use
approximately 5 seconds after power is applied.

2 54-0215 Rev. C
Product specifications are listed in Table 2. Please read the entire manual prior to making
connections between the unit and your system.
Table 2: Product Specifications
Attribute Rating
Performance
Digital Analog
Maximum Input Rate ±375°/sec ±100°/sec
Scale Factor
1000 ppm, 1σof full scale,
for ±375°/sec
Linearity (room temp)
500 ppm, 1σof full scale,
for ±150°/sec
500 ppm, 1σof full scale
Temperature Sensitivity 500 ppm, 1σ500 ppm, 1σ
Error (full rate & temp) 1500 ppm, 1σ1000 ppm, 1σ
Bias
Offset (room temp) ±20°/hr ±100°/hr
Stability (room temp)* 1°/hr, 1σ3°/hr, 1σ
Temperature Sensitivity
(<1°C/min)
6°/hr, 1σ20°/hr, 1σ
>40 Hz,
100 Hz asynchronous
Bandwidth (3 dB)
>400 Hz,
1000 Hz synchronous or
asynchronous
100 Hz
100/sec,
100 Hz asynchronous
Update Rate
1000/sec,
1000 Hz synchronous or
asynchronous
2000/sec
Angle Random Walk (noise)* 4°/hr/√Hz
0.0667°/√hr
6°/hr/√Hz
0.1°/√hr
Initialization Time (valid data) <5 sec
* Bias Stability and Angle Random Walk determined by Allan variance method.

54-0215 Rev. C 3
Table 2: Product Specifications (Continued)
Attribute Rating
Electrical
Digital Analog
Input Voltage +5 VDC ±10%
Power Consumption 3 watts maximum (2 watts typical)
Output
38,400 Baud (RS-232),
100 Hz asynchronous
±2 VDC full scale,
differential
115,200 Baud (RS-232),
1000 Hz asynchronous
Type
3.072 MHz serial,
1000 Hz synchronous
±1 VDC full scale,
single-ended
Format (selectable) Rate, Incremental Angle, or
Integrated Angle
Rate
Physical
Dimensions 3.5" x 2.3" x 1.3"
(88.9 mm x 58.42 mm x 33.02 mm)
Weight 0.6 lbs (0.27 kg)
Environmental
Operating Temperature -40°F to +167°F (-40°C to +75°C)
Storage Temperature -58°F to +185°F (-50°C to +85°C)
Shock (functional) Functional sawtooth 40 g, 6-10 msec
Random Vibration 20 to 2000 Hz, 8 g rms, operational
MTBF >55,000 hours, ground mobile
In all cases while operating, input rate must not exceed ±500°/second. If
the input rate exceeds ±500°/second, physical damage will not occur but
the output data will become unreliable, regardless of the validity BIT.

4 54-0215 Rev. C
An interface control drawing (ICD) illustrating the dimensions, connector placement, and
mounting holes is provided in Figure 1.
All dimensions are shown in inches [millimeters] format.
Figure 1: Interface Control Drawing

54-0215 Rev. C 5
1.2.1 Output Orientation
The DSP-3000 senses rotation on an axis perpendicular to the plane of the baseplate. An
arrow on the product’s serial number label (located on the side of the unit) shows the
rotational direction corresponding to a positive output. Looking at the gyro from overhead,
a clockwise rotation will produce a positive output.
Figure 2: Clockwise Rotation
To minimize output errors and cross-coupling to the sensitive axis of the gyro, the
mounting surface should be parallel to the plane normal to the rotational axis. If this
alignment is not observed, the output data will vary as a function of the cosine of the
misalignment angle.
1.2.2 Interface Connector
The DSP-3000 is equipped with a 15-pin interface connector of the following type: Tyco
Electronics’ single-row Dualobe connector (Tyco part number SSM015L2HN). With the
connector positioned at the top of the gyro wall (as shown in Figure 1), pin 1 is located on
the right side when viewing the connector head-on. Figure 3 shows the gyro interface
connector pins, and Table 3 on the following page lists the function of each pin.
Figure 3: Gyro Connector Pins (Head-on View)
Pin 1Pin 15