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Technical specifications and complete product details are available on the DSP-3000 product page.

The Integrated CommBox Modem (ICM) is the streamlined all-in-one belowdecks unit that drives the TracPhone V7-HTS. It features a browser-based user interface and a convenient iPhone® app for system status, updates, and support. Replacing a full rack of components required for competitors’ systems, the 2U-high ICM contains:
  • IP-enabled antenna control unit
  • CommBox™ Network Manager
  • High-throughput modem
  • Voice over IP (VoIP) adapter
  • Built-in Wi-Fi and Ethernet switch
  • Content storage and access for IP-MobileCast™ and Videotel™ training content
  • Support for over-the-air software updates for the ICM and antenna unit
KVH's E-Core fiber offers a number of advantages, including high polarization maintaining ability (greater than 40 dB-m) and low sensitivity to stress and temperature. These features make E-Core fiber ideal for fiber splicing and pigtailing to other optical components in applications where preserving the state of light polarization is critical to the operation of the device.

The geometrical birefringence created by the elliptical core is the key to the E-Core fiber's outstanding polarization-maintaining abilities. Because of its design, it is able to maintain its polarization and low-loss characteristics when exposed to physical stresses and temperature-induced changes far better than PM fiber created using stress-induced birefringence. It is the E-Core fiber's stability that makes it an excellent choice for pigtailing optical components.

The elliptically shaped core region within an E-Core fiber has a significantly higher index than the surrounding cladding, creating the geometrical birefringence necessary to maintain the polarization of the light within the fiber. The E-Core fibers are manufactured using high-grade silica materials and various high-purity dopants. A dual UV-cured acrylate coating is applied to standard fibers, thereby preventing moisture from penetrating the fiber, preserving its strength, and improving its handling characteristics.
The output of a fiber optic gyro contains a broadband random noise component (sometimes called "white noise") which may result either from "shot noise" or thermal noise in the photodetector. Within the gyro output bandwidth, the noise power spectral density is flat. Two equivalent units of measurement are used to describe this performance: "deg/sq.rt.-hr" or "deg/hr/sq.rt.-Hz." The conversion factor between the two is a factor of 60, and we prefer the latter unit since it directly relates the noise power to the processing bandwidth.

The output bandwidth of our gyro is set in the signal processing electronics to 100 Hz; the random noise decreases as the bandwidth is narrowed in any subsequent signal processing, with the noise decreasing as the inverse of the square root of the integration time (Alternately, the noise is proportional to the square root of the effective bandwidth). The digital output version integrates the gyro signal for 0.1 second before analog-to-digital conversion, improving the noise performance by 3.33 with respect to the analog version, without reducing the instantaneous bandwidth. A user can accomplish the same thing by integrating the analog version output for 0.1 second. The full analog gyro output bandwidth may be necessary for dynamic applications where the angular rate change is rapid or the phase response is critical, as in servo control applications.

The ARW can be measured simply by determining the root-mean-square (RMS) signal output value in the 100 Hz bandwidth, dividing by 10 (sq. root of 100) and interpreting it as an angular rate by applying the scale factor (deg/sec/mv). A more sophisticated method of determining the ARW is the Allan variance method described in IEEE Std. 647-1995.
Bias instability is the fluctuation in indicated angle rate at a constant temperature when the gyro is not rotating. This term is sometimes called bias drift, but sometimes what is meant is the Bias Offset described later. For short data samples, it is not usually possible to determine the Bias Instability as it is masked by the Angle Random Walk. For a fiber optic gyro, bias instability is a zero mean process, and the value quoted in the specification is the RMS. Along with ARW, this fluctuation in bias places a lower limit on the accuracy to which the Bias Offset can be measured, since the bias will wander during the integration time necessary to estimate the Bias Offset accurately. Measurement of this parameter is done at room temperature with a long time series of data subjected to Allan variance.
The Bias Offset is the apparent rotation rate when the gyro is not rotating about its sensitive axis (In precision applications, the user should note that the gyro does measure rotation in inertial space, and the gyro may be measuring a component of the Earth's rotation, of up to 15 deg/hr). The E-Core 1000 is a low-cost product, and uses analog components in the signal processing electronics. There are temperature-dependent offsets in some of the circuits, and this results in a deterministic relationship between bias offset and temperature for each gyro. Bias Offset is the long-term mean indicated rate at a constant temperature when the gyro is not rotating.

The gyro has a temperature sensor whose output is available in both the analog and digital versions. In a land navigation application, the bias offset can be estimated by measuring the apparent rotation rate when the vehicle is stationary. This can be subtracted from the gyro output to yield the true rotation rate. The accuracy of the estimate is dependent on the ARW, since the measurement will have a noise component for short times.
The deviation from the best fit straight line through the input rate-indicated rate data. We describe this in percentage of full-scale reading. The attached figure shows the input-output relationship of the gyro, which is desired to be a straight line, and the percentage error as a function of input rate.
This is the constant of proportionality between the actual gyro rotation about its sensitive axis and the gyro indicated output. In our gyro the output is either in volts/degree/sec (analog) or degrees/bit (digital). The digital gyro output can also be interpreted as the average rotation rate in degrees/sec/bit by multiplying the value by a factor of 10.
The DSP-3000 family is a commercial-grade gyro.  It was not designed specifically or adapted to military use. Further, no government funds were used in its development. Many of our designs are made robust with MIL STD specifications in mind but the DSP-3000 has not been tested or qualified to meet military standards.

The DSP-4000 is an example of a gyro with the same performance characteristics as the DSP-3000. In this case the gyro has been repackaged specifically for military end use and as such falls under Category XII (e) State Department Classification. It also has undergone military qualification testing.
The DSP-3000 Fiber Optic Gyro (FOG) is a single axis open-loop FOG that offers either a digital or an analog output. With a 1 deg/hr bias stability at a constant temperature (digital output version), small package size, and robust modular design, the DSP-3000 is the best value for the money.

For complete product details, visit the DSP-3000 product page.
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