COMPUTERISED RADAR PROCESS FOR MEASURING DISTANCES AND RELATIVE SPEEDS BETWEEN A VEHICLE AND OBSTACLES IN FRONT OF IT

摘要

The invention relates to a computerised radar process to measure distances and relative speeds between a vehicle and several obstacles in front of it, in which a reliable distinction is made between actual and apparent obstacles with a brief evaluation time in four steps (A, B, C, D). The essential feature of the first three steps (A, B, C) is the transmission of constant-frequency signal bursts (20) which form a linearly rising, a linearly falling and a constant-frequency linear sequence on a time-frequency chart. At the end of every reflected signal burst, i.e. with the phase steady, a complex scanning value is determined and potential obstacles are determined on a relative speed-distance chart as the points of intersection of straight lines obtained from the reflected linear signal burst sequences. A special correlation is then used in the computer to extract phantom obstacles and only the received values for the remaining obstacles are processed further.