Patent ID: 8816822
Filing Date: 2014-08-26
Classification: H04B,H04Q

Abstract:
1. A wireless sensor system comprising: a plurality of sensor assemblies positioned remotely from each other, each sensor assembly comprising a radio frequency transceiver configured to wirelessly receive a sensor interrogation signal that includes an indication of a measured transmit power level, each sensor assembly of said plurality of sensor assemblies configured to: a sensor controller positioned remotely from said plurality of sensor assemblies, said sensor controller comprising a radio frequency transceiver configured to transmit a sensor interrogation signal at a first frequency and at a second frequency, the second frequency different than the first frequency, said sensor controller comprising a processor and a memory programmed with instructions that cause the sensor controller to: transmit a sensor interrogation signal into an aircraft fuselage at a frequency that varies over time; determine an output power of the transmitted sensor interrogation signal at a plurality of frequencies; receive a message from each said sensor assembly including the power ratio of the interrogation signal at the plurality of frequencies received by each said sensor assembly, the power ratio determined by each said sensor assembly; and select a transmit frequency for transmitting messages between each said sensor assembly and said sensor controller based on the received messages, wherein the transmit frequency is a frequency at which a power ratio of the input power level of the sensor interrogation signal measured by a particular sensor assembly and the transmitted output power is greater than power ratios determined at the others of the plurality of frequencies.