An Analysis of Spacecraft Data Time Tagging ErrorsAn indepth examination of the timing and telemetry in just one spacecraft points out the genesis of various types of timing errors and serves as a guide in the design of future timing/telemetry systems. The principal sources of timing errors are examined carefully and are described in detail. Estimates of these errors are also made and presented. It is found that the timing errors within the telemetry system are larger than the total timing errors resulting from all other sources. |
Contents
INTRODUCTION | 1 |
ERRORS IN SPACECRAFT CLOCK TIME | 9 |
ERROR IN STATION TIME | 17 |
1 other sections not shown
Common terms and phrases
16 minor frames analog apparent event Automatic gain control base error BCD time code BINARY DIVIDER bit period bit rate board the spacecraft CHANNEL 11 CHANNEL circuitry clock time error Command verification computed Coordinated universal craft clock crystal oscillator data are sampled data signals decoding system determine Digital Subcommutator dynamic skew emission delay encoder equipment error of station estimate experimental data flutter format frame counter FRAME SYNCHRONIZATION ground network station ground station ground wave signals group repetition period GSFC input interval Loran-C chains Loran-C pulse Loran-C stations Loran-C system major master station measured millisecond modulated Momentum wheel observation data obtained orbit oscillator output playback mode played back position vector propagation Pulse jitter real-time data real-time mode SAS-C sky waves slave stations space data spacecraft clock spacecraft position spacecraft telemetry system split phase station clock T₁ tape speed telemetry data tion tracking station transmission uncertainty USNO