When a deep space probe is launched, corrections may be necessary to place the probe on a precisely calculated trajectory. Radio telemetry provides a stream of vectors, x1,…, xk giving information at different times about how the probe’s position compares with its planned trajectory. Let Xk be the matrix [x1… xk]. The matrix
is computed as the radar data are analyzed. When xk+ 1 arrives, a new Gk+1 must be computed. Since the data vectors arrive at high speed, the computational burden could be severe. But partitioned matrix multiplication helps tremendously. Compute the column–row expansions of Gk and Gk+1, and describe what must be computed in order to update Gk to form Gk+1.
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