Single line array is usually used by towed line array to measure target’s bearing

but it can’t acquire information of target’s range or there is a problem of port/starboard discrimination.Aiming at the characters of sound wave in the near-field zone

according to the theory of time domain beam-forming

the target function whose parameters are target’s bearing and range is established.When the towed line array distorts

target’s bearing and range can be acquired according to the parameters related to the maximum value of target function through two-dimensions searching

the target location is realized.target’s bearing and mirror source bearing could be discriminated according to the change of target function’s grey-scale picture.The problem of port/starboard discrimination is solved.The validity of this method is verified by simulations.