We study analytically the detection and tracking of rockets and payloads by microwave or millimeter-wave passive radio temperature measurements, using radio astronomical tech-niques. Such targets may be viewed from synchronous equatorial orbit against either the warm earth or cold sky as background. Their observability depends on the temperature difference between target and background. Simultaneous measurements of output power of multiple antenna beams are processed by spatial filters, to yield a reconstructed image. The image model consists of multiple point targets, viewed against a uniform background. We assume stationary targets in the present work. For background measurements of the warm earth without targets, or for multiple targets that are not well-resolved, Wiener spatial filters are appropriate. In contrast, the best linear processor for well-resolved targets uses matched spatial filters. We relate the system performance to the target, background, antenna, and receiver parameters, for these different types of linear processors.