OBU positioning device and positioning method based on double receiving channels

The invention discloses an OBU positioning device and positioning method based on double receiving channels, and the device comprises an array antenna which is used for receiving a radio frequency signal transmitted by an OBU; the gating switch is used for controlling the connection relation between each selectable antenna unit and the public down-conversion receiving equipment; the local oscillator signal source is used for generating a local synchronization signal; the reference down-conversion receiving equipment is used for mixing the radio frequency signal received by the reference antenna unit and the local synchronization signal, and performing orthogonal transformation to complete down-conversion processing so as to obtain a first digital sequence formed by combining baseband signals I/Q; the public down-conversion receiving equipment is used for acquiring a second digital sequence formed by combining baseband signals I/Q; and the positioning equipment is used for determining a normalized cross-correl