Performance gyros

The procedure for determining the initial values of the DCM for a strapdown-con-figuration does not differ conceptually from the well-known self-levelling and gyro-compassing procedure used for gimballed platform systems. Of course in the former it is performed analytically. 

In the analysis for this study a fifteen-dimensional state-vector was considered besides the nine states necessary to describe a complete three-dimensional inertial positioning system three additional gyro drifts and three accelerometer biases were introduced. For the filter based on zero-velocities as measurements a numerical observability analysis was performed, using the 5in(/ /ar-Vh/ue-Decomposifionapproach, see, e.g., Kothe (1987), Bolcsvolgyi-Ban and Schroder (1990). It turned out that each state (with the exception of the well-known singularity of the longitude) is observable. 

An example of a commercial LoaD platform based on FLISA is the GyroLab workstation (Gyros AB, Uppsala, Sweden) [5]. Lee et al. have reported a portable, fully automated lab-on-a-disc-based ELISA system to test infectious diseases from whole blood [6] which utilizes an optical detection module made up of two sets of matched LEDs and photodiodes to perform absorbance measurements at 430 and 630 nm, respectively (Fig. 2). 

Dimensional instability, a major contributor to the degradation of gyro performance, is virtually eliminated in materials at low temperatures where expansion coefficients approach zero. 

---