1. A method for detecting one or more changes in a monitored environment, the method comprising: transmitting a plurality of interrogation signals to one or more sensors distributed in a monitored environment at a substantially constant power, wherein a first set of the plurality of interrogation signals is transmitted to a first sensor of the one or more sensors; receiving one or more first response signals from the first sensor in response to the first set of the plurality of interrogation signals transmitted to the first sensor; determining an average parameter of the one or more first response signals from the first sensor; comparing the average parameter of the one or more first response signals to an average parameter of a plurality of baseline signals corresponding to the first sensor; determining a statistical significance of the average parameter of the one or more first response signals based on the comparison; and generating a change detection indicator based on the statistical significance.