KVH Industries DSP-3000 Tehnical Manual
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KVH Industries DSP-3000 Tehnical Manual

Fiber optic gyro
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DSP-3000
Fiber Optic Gyro
Technical Manual

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  • Page 1 ® DSP-3000 Fiber Optic Gyro Technical Manual...
  • Page 2 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...
  • Page 3 ® is a registered trademark of KVH Industries, Inc.

  • Page 4: Table Of Contents

    Table of Contents Introduction ............1 Scope of this Manual..............1 Product Description ..............1 1.2.1 Output Orientation ...............5 1.2.2 Interface Connector .............5 Digital 100 Hz Asynchronous Interface......7 Description ...................7 2.1.1 User Commands..............8 Wiring the Gyro for Digital Asynchronous Operation ....9 2.2.1 Wiring Guidelines ..............9 Preliminary Testing ..............10...
  • Page 5 Wiring the Gyro for Digital Synchronous Operation ....21 4.2.1 Wiring Guidelines .............. 21 Preliminary Testing ..............22 4.3.1 Test Procedure ..............22 Analog Interface ............ 24 Description ................. 24 5.1.1 Analog Output Voltage Generation........24 5.1.2 Rate Scaling ..............24 Wiring the Gyro for Analog Operation........

  • Page 6: Introduction

    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.
  • Page 7 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 Linearity (room temp) 1000 ppm, 1σ...
  • Page 8 Table 2: Product Specifications (Continued) Attribute Rating Electrical Digital Analog Input Voltage +5 VDC ±10% Power Consumption 3 watts maximum (2 watts typical) Output Type 38,400 Baud (RS-232), ±2 VDC full scale, 100 Hz asynchronous differential 115,200 Baud (RS-232), ±1 VDC full scale, 1000 Hz asynchronous single-ended 3.072 MHz serial,...
  • Page 9 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...

  • Page 10: Output Orientation

    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.
  • Page 11 Table 3: Gyro Connector Pin-outs Function Type Characteristics +5 V PWR Power Positive +5 VDC supply +5 V RTN Power Return Ground Chassis Gnd Shield Ground Rate + Analog Differential with Rate - Rate - Analog Differential with Rate + Analog Gnd Ground Ground Reference for Rate + / Rate -...

  • Page 12: Digital 100 Hz Asynchronous Interface

    2 Digital 100 Hz Asynchronous Interface 2.1 Description (KVH Part No. 02-1222-01) Connector pins 9 (transmit) and 10 (receive), with ground pin 11, provide an asynchronous serial interface to the gyro. This interface has the following characteristics: Type: RS-232 Baud Rate: 38,400 Baud Parity: None...

  • Page 13: User Commands

    2.1.1 User Commands The following single-character user commands to the gyro are supported: Table 4: Single-character User Commands Command Function Switch output to Rate Switch output to Incremental Angle Switch output to Integrated Angle Zero the Integrated Angle value These single ASCII characters are input without a carriage return or line feed. A command may need to be sent more than once for the command to execute.

  • Page 14: Wiring The Gyro For Digital Asynchronous Operation

    2.2 Wiring the Gyro for Digital Asynchronous Operation Use the wiring diagram below as a guide to connect the gyro to your application. Figure 4: Wiring Diagram (Asynchronous Operation) DC SUPPLY +5 VDC 5 VDC POWER COMMON RETURN CASE GROUND COMPUTER COM PORT SIG GND...

  • Page 15: Preliminary Testing

    Follow the steps below to test the gyro for proper operation. 1. Place the DSP-3000 module on a flat surface with the mounting surface down. 2. Connect the +5 VDC (±10%) power supply positive to pin 1; connect the negative to pins 2 and 3.
  • Page 16 5. Grasp the gyro and slowly rotate it in the direction of the arrow on its serial number label. The output data should indicate a positive change. 6. Slowly rotate the gyro in the opposite direction. The output data should indicate a negative change.

  • Page 17: Digital 1000 Hz Asynchronous Interface

    3 Digital 1000 Hz Asynchronous Interface 3.1 Description (KVH Part No. 02-1222-07) Connector pin 9, with ground pin 11, provides an asynchronous serial interface to the gyro. This interface has the following characteristics: Type: RS-232 Baud Rate: 115,200 Baud Parity: None Data Bits: Stop Bits:...

  • Page 18: Message Structure

    3.1.1 Message Structure A basic message is 32 bits (4 bytes) long. The most significant byte (MSB) is sent first. Table 5 and Figure 5 define the bits in the message. Table 5: Message Bits Bit(s) Usage Values Message Validity 0 = Hardware BIT signal is low or contents are invalid 1 = Hardware BIT OK and contents are valid 30, 29...

  • Page 19: Message Rates

    Integrated Angle Data When the Type bits indicate Integrated Angle data, the contents can be interpreted based on the table below. Table 6: Message Contents (Type Bits = Integrated Angle Data) Bit(s) Usage Values 25, 24, 23 Increment when crossing from 359 to 0. 360°...

  • Page 20: Wiring The Gyro For Digital Asynchronous Operation

    3.2 Wiring the Gyro for Digital Asynchronous Operation Use the wiring diagram below as a guide to connect the gyro to your application. Figure 6: Wiring Diagram (Asynchronous Operation) DC SUPPLY +5 VDC 5 VDC POWER COMMON RETURN CASE GROUND COMPUTER COM PORT SIG GND...

  • Page 21: Preliminary Testing

    Follow the steps below to test the gyro for proper operation. 1. Place the DSP-3000 module on a flat surface with the mounting surface down. 2. Connect the +5 VDC (±10%) power supply positive to pin 1; connect the negative to pins 2 and 3.
  • Page 22 5. Grasp the gyro and slowly rotate it in the direction of the arrow on its serial number label. The output data should indicate a positive change. 6. Slowly rotate the gyro in the opposite direction. The output data should indicate a negative change.

  • Page 23: Digital 1000 Hz Synchronous Interface

    4 Digital 1000 Hz Synchronous Interface 4.1 Description (KVH Part No. 02-1222-02 & 02-1222-04) The high-speed transistor-to-transistor level (TTL) synchronous serial interface provides the same performance as the asynchronous interface, but with a standard output rate of 1000/sec. Figure 7 shows the typical signal timing for the interface. Figure 7: High-speed Synchronous Signal Timing Tclk (T=325ns) Msync...

  • Page 24: Message Structure

    The BIT signal operates independently of the other signals in the interface. The Clock rate is 3.072 MHz. The Serial Data and Frame Sync are stable when the clock signal’s rising edge occurs. The Data and Frame Sync change states when the clock signal’s falling edge occurs. The Frame Sync signal becomes active high for the duration of the data message.

  • Page 25: Message Content

    4.1.2 Message Content Use of the 26-bit Content field depends on the Type bits, as noted below. Rate Data When the Type bits indicate Rate Data, the contents are in two’s complement format. The LSB represents 60 µ°/s, or 0.216°/hr. Incremental Angle Data When the Type bits indicate Incremental Angle Data, the contents are in two’s complement format.

  • Page 26: Wiring The Gyro For Digital Synchronous Operation

    4.2 Wiring the Gyro for Digital Synchronous Operation Use the wiring diagram below as a guide to connect the gyro to your application. Figure 8: Wiring Diagram (Synchronous Operation) DC SUPPLY +5 VDC 5 VDC POWER COMMON RETURN CASE GROUND SIGNAL COMMON CUSTOMER Tclk...

  • Page 27: Preliminary Testing

    Follow the steps below to test the gyro for proper operation. 1. Place the DSP-3000 module on a flat surface with the mounting surface down. 2. Connect the +5 VDC (±10%) power supply positive to pin 1; connect the negative to pins 2 and 3.
  • Page 28 4. With the gyro held stationary, the indicated mean (30-second average) input rate should be less than 0.005°/s, excluding Earth rate. If no data is received, check the wiring for proper data line connection. If a parity error occurs, check your terminations.

  • Page 29: Analog Interface

    5 Analog Interface 5.1 Description (KVH Part No. 02-1222-03) Connector pins 4 (rate +) and 5 (rate -), with ground pin 6, provide an analog interface to the gyro. This interface provides a linear rate range of ±100°/second. Temperature compensation tables are used to minimize bias drift and improve scale factor accuracy and linearity versus temperature.

  • Page 30: Wiring The Gyro For Analog Operation

    GROUND REFERENCE 5.2.1 Wiring Guidelines Wiring interfaces are critical in a gyro such as the DSP-3000, particularly for analog signals. Be sure to follow the guidelines below to ensure optimum performance. • The chassis ground, pin 3, as well as the housing, should be coupled to the system ground with minimum impedance.
  • Page 31 • Twisted-shielded-pair should be used to connect the gyro output to the user interface. The shield may be connected to analog ground at the gyro and signal ground in the user’s electronic interface. • Due to the low-level analog voltages from the gyro, cables longer than 12" (30 cm) to the user’s interface are not recommended without buffering.

  • Page 32: Preliminary Testing

    Follow the steps below to test the gyro for proper operation. 1. Place the DSP-3000 module on a flat surface with the mounting surface down. 2. Connect the +5 VDC (±10%) power supply positive to pin 1; connect the negative to pin 2.

  • Page 33: Mounting The Gyro

    6 Mounting the Gyro The DSP-3000 gyro is easily mounted to a structure using the four #8-32 tapped mounting holes on the base of the enclosure (see Figure 11). The mounting surface should be flat, less than 0.005" (0.127 mm) peak-to-peak, pad-to-pad. The material should be greater than 0.2"...

  • Page 34: Troubleshooting

    7 Troubleshooting This section is intended to provide a simple means of determining if a problem exists in the KVH DSP-3000 gyro and assumes that the unit has passed the bench testing described in previous sections. The DSP-3000 is supplied as a sealed unit. Breaking the QA seals voids the warranty and may violate the contract under which the unit was supplied.

  • Page 35: Appendix A Patent Protection

    Appendix A Patent Protection* One or more of the following U.S. and international patents protect the technology in KVH fiber optic gyros: Patent Numbers AU 728699 US 5,340,371 AU 750301 US 5,444,534 DE 0 254 462 US 5,481,358 DE 60002436 US 5,512,904 DE 69509587 US 5,552,887...
  • Page 36 DSP-3000 LIMITED WARRANTY ON HARDWARE KVH Industries, Inc. warrants the KVH Fiber Optic Gyro purchased against defects in materials and workmanship for a period of ONE (1) year from the date of original retail purchase by the original purchaser. If...
  • Page 37 ® KVH Industries, Inc. 50 Enterprise Center • Middletown, RI 02842-5279 • U.S.A. ® is a registered trademark of KVH Industries, Inc.

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