for u03b8 0 n 1 for all vectors in the 360 u00b0 sweep d when the maximum range break point has been determined all related u03b4x u03b4y and r sub u03b8 values are stored in a read only memory rom look up table fig4 shows the aggregate scan pattern that is generated by the described embodiment at a particular location on the screen this showing is of course only illustrative of the generated aggregate radial scan pattern since the radials making up the pattern will actually be separated by angular spacing differences that are so small they can not be illustrated in the figure in the representative scan pattern of fig4 the circled numbers 1 to 8 indicate the sequence in which the radial lines are produced by the described embodiment for example the 4k acp resolution line 1 starts at the origin and extends to the edge of the display area the 32k acp resolution radial line 2 i e the one that begins at the 32k resolution boundary and extends to the edge of the display area is generated next then in sequence the 16k acp resolution line 3 a second 32k acp resolution line 4 the 8k acp resolution line 5 a third 32k acp resolution line 6 a second 16k acp resolution line 7 and a fourth 32k acp resolution line 8 the 4k acp resolution line then moves from the acp0 direction to the acp1 direction and the aggregate scan pattern is regenerated as noted above fig5 shows data pattern of the look up table rom that is used to generate the aggregate radial scan pattern of.