Three-dimensional and four-dimensional mapping of space using microwave and MM-wave parallax

A method of determining an object's distance, the method comprising:

• delivering a first RF signal from a first transmitter to the object;
• changing a direction of the first transmitter along both azimuth and elevation until the first transmitter reaches a first direction defined by first and second angles at which a power of a first reflected RF signal reflected off the object and received by a receiver reaches a maximum value;
• delivering a second RF signal from a second transmitter to the object;
• changing a direction of the second transmitter along both azimuth and elevation until the second transmitter reaches a second direction defined by third and fourth angles at which a power of a second reflected RF signal reflected off the object and received by the receiver reaches a maximum value;
• determining a distance between the object and the first transmitter in accordance with a distance between the two transmitters, and the first, second, third and fourth angles;
• deactivating the second transmitter while delivering the first RF signal from the first transmitter;
• and
• deactivating the first transmitter while delivering the second RF signal from the second transmitter.