Two dimension RF location method and apparatus

A method of generating information identifying a two-dimensional location of objects in within a space, the method comprising:

• a) transmitting from a first location a first signal having a parameter corresponding to a first object of a plurality of objects within the space;
• b) receiving a first responsive signal from the first object;
• c) determining first distance information based on a relationship between the first signal and the first responsive signal;
• d) transmitting from a second location a second signal having a parameter corresponding to the first object;
• e) receiving a second responsive signal from the first object;
• f) determining second distance information based on a relationship between the second signal and the second responsive signal;
• g) determining a two-dimensional location of the first object within the space based on the first distance information and the second distance information.

A system for generating information identifying a two-dimensional location of an animal cage in within a space having a plurality of animal cages, comprising:

• a plurality of cage modules, each of the plurality of cage modules corresponding to one of the animal cages;
• first and second radio transceiver systems spaced apart by a predetermined distance, the first and second radio transceiver systems disposed proximate the space, each of the first and second radio transceiver systems operable to selectively transmit a signal to select cage module, receive a response signal from the select cage module, and generate first information based on a detected relationship between the selective transmission and the receipt of the response signal;
• and
• a device operable to calculate a two-dimensional location of the select cage module based on the first information generated by the first radio transceiver system and the first information generated by the second radio transceiver system;
• a display operable to display information representative of the calculated two-dimensional location.