The present invention provides a method for transmitting and receiving ultra wide band (UWB) signals. By this method, application systems such as wireless UWB communication, wireless UWB positioning and UWB target detecting radar can be achieved. In this method, an UWB device periodically generates pulse signals. In each pulse repetition period, an output signal can be a positive-polarity pulse (positive pulse), or a negative-polarity pulse (negative pulse), or an empty signal (empty signal) without any change. A method of UWB device controlling the output signal to shift between the positive pulse, negative pulse and empty signal is very simple and easy to implement. A transmitter can transmit any variable pulse sequence (the arranging order of the positive pulse, negative pulse and empty signal; the length of the sequence). One or more definite pulse sequences are used to constitute wireless information frame according to certain rules, and functions such as communications, positioning and target detection between one or more transmitters and one or more receivers can be realized. The prevent invention provides a method for generating UWB signals, as well as a low-cost and a high-performance UWB signal receiving method. According to the UWB signal generating and receiving method disclosed in the present invention, the system can very conveniently change (by software control) a central frequency and signal bandwidth of the UWB signals, and therefore can satisfy application requirements in different fields. A plurality of such transceivers can simultaneously work at the same waveband or different wavebands.