Abstract
It is a requirement of all communications satellites that the transmit antenna boresight be aligned to a target station within a stated error bound. The paper discusses the individual error components and assesses the impact of each one upon the bore sight error. An error budget is derived in which each source is allocated a portion of the total allowable error. It is desirable to demonstrate in-orbit that the overall error budget has not been exceeded and to estimate the contribution of the major sources. A major problem in the error estimation is the quantity and quality of available measurements. The impact on the development and performance of the filter is examined in detail. Extensive tests indicate that the total error can be estimated accurately, but that apportionment is limited to major components due to lack of measurements.
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