| 摘要 |
Emission values of existing broadband pulse echo methods, particularly those used in industrial metrology for level measuring, frequently reach the permissible limit values. In order to avoid possible radio permissions of the relevant measuring instrument, the invention provides a method and a circuit for optimizing the emission of broadband transmit pulses of a pulse echo method, during which the transmit pulses are transmitted with a pre-selected pulse repetition frequency. The inventive method and the circuit provide that the polarity of a pulse is, with each cycle of the pulse repetition frequency, reversed according to a random sequence or that individual pulses are, with each cycle of the pulse repetition frequency, suppressed according to a random sequence. |
