SU729597A1 - Arrangement for transformation of rectangular coordinates into polar coordinates - Google Patents

Description

(54) DEVICE FOR CONVERSION OF RECTANGULAR COORDINATES TO POLAR The invention relates to computing technology and can be used in radar, navigation and other computing complexes. A similar device is known for converting rectangular coordinates to polar coordinates, which contains coordinate potentiometers, a range potentiometer, two sine-cosine potentiometers, and two tracking systems associated with them 1. The device is characterized by low rapidity and cumbersomeness due to the use of electromechanical assemblies. The closest in technical essence to the invention is a device containing two blocks of multiplicity connected by the first inputs to the sources of rectangular coordinates, and the second inputs to the outputs of a sine-cosine converter, the input of which through a counter is connected to the output of the comparator, the inputs which are connected to the outputs of the corresponding multiplication blocks 2. The device balances the projections of the rectangular coordinates by changing the value of the argument, after which the values of the argument and the magnitude of the vector post fall on the way out. However, the accuracy of the device lies in a certain loss of accuracy when balancing the projections of X sin. Y cos СЛ, since the factors sin сК and cos t decrease the steepness of the error matching characteristic. In addition, it is necessary to calculate another pair of projections, the total value of the modulus 0 X COS dL in the sum. + Y sine. This requires the introduction of two more multipliers and an adder. The aim of the invention is to increase | precision and simplification. This is achieved by the fact that the device for converting rectangular coordinates to polar coordinates, containing the first comparator connected in series, a counter and a sine-cosine converter, contains two division units, a second comparator and a switch, the rectangular coordinate inputs of the device are connected to the first inputs of the corresponding division blocks and with the corresponding inputs of the second comparator, the second inputs of the division units are connected to the corresponding outputs of the sine-cosine converter, the outputs of the division units WMOs connected to respective rows of the first comparator and -pereklyuchatel controlling kschiyVHOD which is connected to the output of the second comparator, the outputs of the switch and the counter are output devices.

The drawing is a block diagram of the device.

The proposed device contains input buses of rectangular coordinates 1 and 2, division blocks 3 and 4, sine-sinus converter 5, counter 6, comparators 7 and 8, switch 9. Device outputs 10 and 11.

The device works in the following way.

Tires 1 and 2 supply voltages corresponding to the X and Y coordinates to the device input.

The signal from the comparator 7 in the counter b counts the angle code 3L. Converter 5 generates sine and cosine codes supplied to blocks 3 and 4 of the division. The signals from the outputs of blocks 3 and 4. and - are compared in comparator 7. When they are equal, comparator 7 stops the operation of the counter b of the argument value.

With the help of a comparator 8 and a control of the switch 9, the value -if is supplied to the output if, and.

if y's ,

This is done to reduce the error in determining the modulus caused by the discrete nature of the change in the argument Ot. about

The dividing units 3 and 4 can be pea alized on an operational amplifier with a digital controlled resistor in the feedback circuit. Newly introduced

the comparator 8 and switch 9 also do not require large hardware costs. In terms of hardware, they correspond to a one-bit switch. A digital dongle converter converter.

It can be considered that the technical and economic effect from the use of the invention is due to the savings in instrumental costs while increasing the accuracy of the conversion.

Claims (2)

1. Authors (Certificate of the USSR No. 339920, class G 06 G 7/22, 1972. 2.Patent of France No. 2209147, cl. G 06 G 7/22, publ. 1974 (prototype).