The present invention discloses a hydraulic jack for long-term support. The floor element comprises at least one attachment means, which can be reached from the top, for attaching items of equipment, and on the underside at least one retaining means for attaching the floor element at a positioning space in a vehicle. A local oscillator offset ratio is calculated based on a measured frequency shift of the reference burst and the Doppler offset ratio. In some implementations, the method further comprises applying an electric potential on an antenna electrode interfaced at the port to induce a corona discharge into the chamber, in which the corona discharge ignites the ionized fuel particles within the chamber.