SU362448A1 - DIGITAL-COSINUS CONVERTER - Google Patents

Description

one

The invention relates to the field of radio engineering and can be applied in indicators of a circular view of radar stations (radar) with a uniform all-round view, and with programmed control of the angle of rotation of the radar beam.

A digital device is known for forming a radial-circular scan on a screen of a cathode ray tube (CRT), into a rotor, splitting the coordinates into the sine and cosine components is done using the piecewise linear approximation method using a digital approximator. This device contains a direct and inverted code sensor, a digital phase shifter, two code switches, a code modifier and an arithmetic unit (interpolator).

In order to increase the allotment, logic transducers “And for two inputs. Some inputs of the circuits “And are connected to the output of a digital generator of a reference sinusoidal number pulse code from 0 to 90 °, and others through triggers - to the outputs of the transducers“ code - time interval. The transducer inputs “code - time interval are connected to the outputs of the code switches. The outputs of logic circuits “And connected to the newly entered pulse counters.

The drawing shows a diagram of a digital sine-cosine converter.

Digital sine-cosine converter FOR shaper radial-circular

sweep contains a direct and inverted code 1 sensor, phase shifter 2, two code 3 switches, two code “time interval 4” transducers, qi) oscillator 5 of the reference sinusoidal code

from O to 90 °, two triggers 6, two schemes “And 7, two pulse counters 8, source of clock pulses 9. The digital generator of the reference sinusoidal number of pulse code from O to 90 ° contains counter 10, a decoder 11,

Permanent memory device (ROM) 12, a multiplying device 13. The output of the digital generator 14 is connected to the first inputs of the "I 7" circuits. The digital sine-cosine converter works as follows. Digital generator 5 generates a reference impulse sinusoid code ranging from 0 to 90 °, which is accumulated in counters 8. Radar antenna rotation code input code

(outputs 15) are compared in converters "code - interval 4 with linear scan code of digital oscillator 5. The resulting pulses (at outputs 16 and 17) stop counters 8.

Thus, at the output of the counters 8, the code sin a and cos was formed. For the simultaneous formation of the codes sin a and cos and in the circuit there are two transducers — the interval 4 and two counters 8 (sine n and cosine). The input of the transducers 4, the input code, comes from the code 3 switches, which commute the direct and inverted code (outputs 15, within 90 °, which is necessary to form the sin a and cos sat codes) in the range from 0 to 180 °. The most significant bit of the input code (at outputs 15) is significant and is used as a sign since. To form the sign of cos a shifted by 90 °, digital phase shifter 2 is used in the circuit.

The drawing shows a diagram of a device that converts a 12-bit code for the angle a of antenna rotation to a 10-bit code sin a and cos a. The 12th bit of the input code a is significant. The linear sweep code of the digital generator 5 is represented by a 10-bit parallel code; The 7th, 8th, 9th, and 10th bits of this code control the decoder) /, which has sixteen outputs, equal to the number of approximation segments. ROM 12 is six OR.

The first six bits of the linear sweep code (output 18) are fed to the multiplying device 13 for multiplying with the ROM 12 code, as a result of which the output of the generator 14 forms the number pulse code of the reference sinusoid. In the range from O to 90 °. The frequency of generating the reference sinusoid code is equal to the frequency of the radar probe pulses.

Switches 3 control the forward and inverted 11th bits of the input code a (output 15).

Subject invention

Digital sine-cosine converter for radial-circular imager

a sweep, containing two commutators of codes, the inputs of which are connected to a forward and inverted codes sensor and a phase shifter, and two converters "code - time interval, characterized in that

in order to increase reliability, logic “And to two inputs, one inputs of which are connected to the output of a digital generator of a reference sinusoidal number of pulse code from O to 90 °, are entered into it

the others through the triggers to the outputs of the converters "code - time interval, the inputs of each of which are connected to the outputs of the code switches, while the outputs of the logic circuits" And connected to the newly introduced pulse counters.