Patent ID: 7659812

Claim:
An automotive tire pressure monitoring system comprising: a primary antenna disposed adjacent a vehicle window; a secondary antenna disposed adjacent a vehicle window distal said primary antenna: a receiver; switch means selectively coupling said primary and secondary antennas with said receiver; a processor; and a memory subsystem coupled to the processor, the memory subsystem storing code that when executed by the processor instructs the processor to perform the steps of: connecting the primary antenna to the receiver; detecting and measuring the strength of a message signal indicative of a vehicle tire condition received by the primary antenna; calculating the signal to noise ratio for the primary antenna; connecting the secondary antenna to the receiver; detecting and measuring the strength of a message signal indicative of a vehicle tire condition received by the secondary antenna; calculating the signal to noise ratio for the secondary antenna; comparing the primary antenna signal to noise ratio with the secondary antenna signal to noise ratio; connecting the antenna with the highest signal to noise ratio to the receiver; processing the received signal; and generating an output signal as a function of information contained in said received signal.