Patent ID: 8102303
Filing Date: 2012-01-24
Classification: G01S

Abstract:
1. A method for distance measurement and data transmission in a continuous wave radar system in which a transmit and receive module and a transponder device are disposed, comprising: generating an unmodulated continuous wave signal at a selected frequency band in the transmit and receive module, the unmodulated continuous wave signal to be broadcast over-the-air in a predefined frequency spectrum allocated to wireless radio frequency communication to interrogate a transponder, wherein before the unmodulated continuous wave signal is broadcast over-the-air to interrogate the transponder device, performing an over-the-air monitoring of the frequency spectrum allocated to wireless radio frequency communication to determine at least one frequency band available in the predefined frequency spectrum to broadcast the unmodulated continuous wave signal without mutual interference with a further transmit and receive module, and wherein the selected frequency band of the unmodulated continuous wave signal corresponds to said at least one available frequency band; searching for the transponder device with the aid of the unmodulated continuous wave signal as an interrogation signal; sending a radio response signal in response to the interrogation signal from a transponder device to the transmit and receive module; generating a frequency-modulated continuous wave signal in the transmit and receive module in response to the radio response signal; and measuring a distance between the transmit and receive module and the transponder device with the aid of the frequency-modulated continuous wave signal.