Patent ID: 7202778

Claim:
A wireless tire pressure sensing system for an aircraft, said system comprising: dual resonant circuits mounted to a wheel of the aircraft, one resonant circuit comprising: a first variable capacitance sensor for monitoring the pressure of a tire mounted to said wheel; and a first wire loop of a first predetermined inductance coupled to said first variable capacitance sensor, and the other resonant circuit comprising: a second variable capacitance sensor operative as a reference to said first variable capacitance sensor; and a second wire loop of a second predetermined inductance coupled to said second variable capacitance sensor; an interrogating circuit magnetically coupleable to said dual resonant circuits and operative to induce magnetically a variable frequency current in the dual resonant circuits, said one resonant circuit responding to said induced current with an E-field signal at a first resonant frequency commensurate with the capacitance of said first variable capacitance sensor, and said other resonant circuit responding to said induced current with an F-field signal at a second resonant frequency commensurate with the capacitance of said second variable capacitance sensor; a receiving circuit F-field coupleable to said dual resonant circuits and operative to receive said E-field signals at said first and second resonant frequencies and to generate first and second signals representative thereof; and a processing circuit coupled to said receiving circuit for processing said first and second signals to generate a compensated pressure reading of said tire.