Polar to rectangular coordinate converter
AssigneeRCA Corporation
InventorKazuo Katagi
Life of this patent
Estimating the term…
Abstract
A memory for a coordinate converter stores, for each azimuth at which information from an information source may be received in a polar coordinate system, the incremental X and Y coordinate values, .DELTA.X and .DELTA.Y, for an incremental change in range along the azimuth. For each azimuth these incremental coordinate values .DELTA.X and .DELTA.Y are retrieved from memory and entered into summing devices which are incremented respectively by .DELTA.X and .DELTA.Y for each increment of range. The integers of the values of the summing devices represent X and Y coordinate values in a rectangular coordinate system and may be utilized to address an information reception device such as a random access memory.
Claims10
A polar to rectangular coordinate converter which produces, for azimuth values and range values in a polar coordinate system, corresponding row and column values in a rectangular coordinate matrix comprising in combination:
- means receptive of a signal indicative of a desired one of said azimuth values for producing fractional trigonometric sine and cosine values corresponding thereto;
- first and second storage means;
- first summing means receptive of said sine value and the value in said first storage means for computing the sum thereof and for storing the fractional part of said sum in said first storage means and for producing a pulse indicative of the integer part, if any, of said sum and for repeating said sum computing operation with said sum and said sine value a number of times corresponding to the number of ranges of interest for said desired azimuth;
- first counter means responsive to said integer indicative pulses for counting the same, the count in said counter at the completion of each sum computing operation representing the value of one of said row and column;
- second summing means receptive of said cosine value and value in said second storage means for computing the sum thereof and for storing the fractional part of said sum in said second storage means and for producing a pulse indicative of the integer part, if any, of said sum and for repeating said sum computing operation with said sum and said cosine value a number of times corresponding to the number of ranges of interest for said desired azimuth;
- and
- second counter means responsive to said integer indicative pulses from said second summing means for counting the same, the count in said counter at the completion of each sum computing operation representing the value of the other of said row and said column.
Dependencies are inferred from the claim text.