Abstract: A ground-control system for a fleet of satellites provides a highly reliable means that automatically recognizes undesirable telemetry state changes and automatically transmits the required commands to the proper satellite to place the satellite operational parameters into the desired state. The ground-control system utilizes hardware, software and two redundant ground-control sites: a Control site and a Monitor site. There may also be a number of disabled sites to replace one of the redundant ground-control sites, at a moment's notice, if necessary. Both redundant sites constantly and independently monitor and verify validity of satellite telemetry. Upon occurrence of an undesired state change (event) upon a particular satellite, ground-control computers at both sites independently recognize the event and automatically begin a response.

Abstract: The specification describes a portable exercising mat comprising a first portion and a second portion integral with one another. The second portion is constructed from a soft resilient material and is thickened relative to the first portion. The arrangement is such that when a person is lying in a supine position on the mat, with the person's head resting on the first portion, the person's back is supported by and arched over the second portion. The first portion is preferably provided with a pair of hand grips and may also be constructed from the same material as the second portion. This preferred arrangement is especially suitable for performing repeated tumbling exercises.