A circuit arrangement is provided for processing satellite signals
comprising a first circuit part, which is made as a processor for
computing position and/or speed signals from satellite signals, a second
circuit part, which is made as a real-time clock to provide a time
signal, at least two voltage sources, which are provided to supply at
least one circuit part, and switching means, which are provided for
switching the supply of at least one circuit part between the first
voltage source and the second voltage source. According to an embodiment,
the switching means have at least one voltage monitor with a bandgap
voltage reference circuit to determine a switching voltage. The circuit
arrangement can be used for GPS-supported navigation systems.