**6. Conclusions**

468 Modern Telemetry

Fig. 10. The residual of the difference between telemetry and tracking velocity.

Fig. 11. The residual of the difference between telemetry and tracking position.

initial errors are exact and precise.

*<sup>T</sup> T T <sup>a</sup>* **KDP** and letting

Selecting vector =

the

It is clearly seen from Figs. 8 and 10 that the differences between telemetry velocity and tracking velocity obtained by the two methods agree well. When the third stage engine shut down, the difference between telemetry velocity and tracking velocity is ( ) 3.46, 1.34, 0.90 m/s − , while the largest residual computed by the two methods is ( ) −− − 0.0015, 0.0019, 0.006 m/s , which is quite smaller than the difference between telemetry velocity and tracking velocity. Similarly, as seen in Figs. 5 and 7, when the third stage engine shut down, the difference between telemetry position and tracking position is ( ) − − 400, 25, 672 m , while the largest residual computed by the two methods is ( ) 0.29, 0.19, 0.19 m , which is quite smaller than the difference between telemetry position and tracking position. It follows that the separation model of instrumentation errors and

The instrumentation errors and initial errors are estimated by using the above data.

*<sup>T</sup> T T*

*ss s* = − **HS G** , the in the position domain,

In this chapter, the separation model of initial launch parameter errors and guidance instrumentation systematic errors are formulated based on telemetry and tracking data. The calculation of difference between telemetry and tracking data is discussed in detail. It is generally considered that the telemetry data contain instrumentation errors while tracking data contain systematic errors and random measurement errors of exterior measurement equipment. Numerical examples are given for the verification of the separation by using sixdegree-of-freedom trajectory program. Simulation results indicate that the separation model of initial errors and guidance instrumentation systematic errors can estimate the error coefficient well and is exact.

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