A method of using a radar sensor for a security system to determine a range of a sensed moving object or person, the method comprising: transmitting, from the radar sensor, a plurality of radar pulses and, when the object or person is present to reflect the radar pulses, receiving a corresponding plurality of pulses, the transmitting and receiving comprising: transmitting a first radar pulse having a first defined pulse duration; receiving a first reflected radar pulse, wherein the first reflected radar pulse is at least a portion of the first radar pulse that has reflected off of the object or person; determining, at the radar sensor, whether there is a first pulse overlap between the first radar pulse and the first reflected radar pulse; selecting a second defined pulse duration for a second radar pulse based on the determination of the first pulse overlap, wherein the second defined pulse duration is different from the first defined pulse duration; transmitting the second radar pulse having the second pulse duration; receiving a second reflected radar pulse, wherein the second reflected radar pulse is at least a portion of the second radar pulse that has reflected off of the object or person; and determining, at the radar sensor, whether there is a second pulse overlap between the second radar pulse and the second reflected radar pulse; and determining a range in which the object or person is located based on the determinations of whether there is said first pulse overlap and whether there is said second pulse overlap. transmitting, from the radar sensor, a plurality of radar pulses and, when the object or person is present to reflect the radar pulses, receiving a corresponding plurality of pulses, the transmitting and receiving comprising: transmitting a first radar pulse having a first defined pulse duration; receiving a first reflected radar pulse, wherein the first reflected radar pulse is at least a portion of the first radar pulse that has reflected off of the object or person; determining, at the radar sensor, whether there is a first pulse overlap between the first radar pulse and the first reflected radar pulse; selecting a second defined pulse duration for a second radar pulse based on the determination of the first pulse overlap, wherein the second defined pulse duration is different from the first defined pulse duration; transmitting the second radar pulse having the second pulse duration; receiving a second reflected radar pulse, wherein the second reflected radar pulse is at least a portion of the second radar pulse that has reflected off of the object or person; and determining, at the radar sensor, whether there is a second pulse overlap between the second radar pulse and the second reflected radar pulse; and transmitting a first radar pulse having a first defined pulse duration; receiving a first reflected radar pulse, wherein the first reflected radar pulse is at least a portion of the first radar pulse that has reflected off of the object or person; determining, at the radar sensor, whether there is a first pulse overlap between the first radar pulse and the first reflected radar pulse; selecting a second defined pulse duration for a second radar pulse based on the determination of the first pulse overlap, wherein the second defined pulse duration is different from the first defined pulse duration; transmitting the second radar pulse having the second pulse duration; receiving a second reflected radar pulse, wherein the second reflected radar pulse is at least a portion of the second radar pulse that has reflected off of the object or person; and determining, at the radar sensor, whether there is a second pulse overlap between the second radar pulse and the second reflected radar pulse; and determining a range in which the object or person is located based on the determinations of whether there is said first pulse overlap and whether there is said second pulse overlap. <EOS>