Acquiring information regarding a volume using wireless networks

A system for acquiring information regarding terrain and/or objects within a volume, said system comprising:

• a wireless network (“subject network”), including at least two nodes, wherein one or more of the nodes of the subject network (“transmitting subject network nodes”) transmit signals over time (“node signals”);
• one or more receiving units (“node signal receivers”), configured to receive the node signals after their traversing a medium (“node resultant signals”);
• and
• one or more processing units (“mapping units”), configured to perform at least the following:
• (a) Measure one or more physical attributes (“signal attributes”) for one or more of the node resultant signals, wherein at least one of the signal attributes is of at least one of the following types:
• (i) Time difference between node signal transmission by the applicable transmitting subject network node and node resultant signal reception by the applicable node signal receiver;
• (ii) Phase difference between the transmitted node signal and the received node resultant signal;
• (iii) Power ratio between the transmitted node signal and the received node resultant signal;
• (iv) Frequency difference between the received node resultant signal and the transmitted node signal (Doppler shift);
• and/or
• (v) Direction from which the node resultant signal has arrived, and/or its projection on one or more predefined axes;
• (b) Estimate the spatial location as a function of time for one or more of the transmitting subject network nodes and/or one or more of the node signal receivers;
• and
• (c) Analyze one or more of the node resultant signals and/or one or more of the signal attributes to extract information regarding objects along the signal's paths (“mapping information”).