SU640423A1 - Digital sine-cosine converter for shaping radial-circular sweep - Google Patents

Description

code from O to 90 °, a code switch is entered, while the outputs of the code switches are connected to the input of the converter by a code-time interval through the code switch, and to the corresponding input of a digital generator of a reference sinusoidal code from O to 90 ° by the most significant bits , the outputs of the binary parallel code of which are connected to the inputs of the parallel recording of pulse counters, and the control inputs of the code switch are connected to the outputs of the synchronizer.

The drawing shows a structural electrical circuit of the proposed converter.

The converter contains sensor 1 of direct and inverted codes, phase shifter 2, switches of codes 3 and 4, converter 5 "code-time interval, digital generator 6 of the reference sinusoidal code from O to 90 °, triggers 7 and 8, elements 9 and 10, pulse counters And and 12, the synchronizer 13 and the switch code 14.

The digital generator 6 contains a pulse counter 15, a decoder 16, a persistent storage device (ROM) 17, and a number-pulse duplicating unit 18.

The Converter operates as follows.

Sensor 1, depending on the angular position of the antenna, generates a parallel binary code. The most significant bit of this code is the sign bit of the sina function. To form the sign bit of the cosa function, a digital phase shifter 2 is used. The input of the converter 5 is a code-time interval code comes from the output of code switch 14, which, by synchronizer pulses 13, the sina operation or the cosa operation switches the code from one of the code 3 switches or 4, which commute the direct and inverted sensor code 1 within 90 °, which is necessary to form the sina (or cosa) code in the range from 0 to 180 °.

A digital generator 6 of a reference sinusoidal code from 0 to 90 ° generates sina or cosa codes in one of the approximation sections, the number of which is determined by the number of most significant code bits from the output of code switch 14. At the output of the parallel code, the function appears in the nodes approximations, and at the output of the number-pulse code - function increments between nodes. Only the lower bits of the code, which are compared with the linear sweep code within the approximation interval, arrive at the input of the code-time interval 5.

The operations of converting code a into codes sina and cosa are performed sequentially in time. At the first time, the pulse counter 15 of the generator 6 is set to the zero state, and a parallel code is written to one of the counters 11 or 12. With the same pulses, trigger 7 is set to one position and opens element E 9, which passes the number-pulse code from the generator output of b and counter 11. The pulses in counter 11 accumulate until

With a pulse from the converter 5, the code-time interval trigger 7 will be set to the zero position. Similarly, the conversion is carried out on another component. At the outputs of the counters 11 and 12, codes sina and cosa are formed, the values of which are remembered before the next conversion operation.

The drawing shows a converter for converting a 12-bit code to

10-bit code sina and cosa. The 12th bit of the input code a is indicative of the sina code. From the 11th and 12th bits, the phase shifter 2 forms a sign bit for the cosa code, the 7, 8, 9, and 10th bits of the input code and, after the switches 3 and 4 and the switch 14, control the decoder 16, the outputs which form with the help of ROM 17 the speed codes of the sine function at each approximation area

and function value codes at approximation nodes.

The six bits of the linear sweep code are fed to the multiplier block 18 for multiplying with the ROM code 17, as a result of which the output of the generator 6 forms the number-pulse code of the function increment. Switches 3 and 4 control the direct and inverted bits of the input code a. The response speed of the predol converter increased by 8–16 times in comparison with the known transducer.

Claims (1)

Invention Formula A digital sine-cosine converter for generating a radial-circular scan, containing a forward and inverted code sensor, to the corresponding outputs of which two code switches are connected directly and via a phase shifter, elements And, some inputs of which are connected to the output of the digital pulse code of a digital generator of a reference sinusoidal code from O to 90 °, other inputs through triggers to the first output of the converter “code-time interval, and outputs to the counting inputs of pulse counters, and the synchronizer, the corresponding outputs of which are connected to the inputs of the trigger setup, pulse counters and a digital generator of a reference sinusoidal code from O to 90 °; the second output of the converter is a code-time interval connected to the input of a linear sweep code of a digital generator of a reference sinusoidal code from O to 90 °, characterized in that, in order to improve speed, a code switch is introduced into it, while the outputs of the code switches are connected to the input of the converter by means of a code switch in the code-time interval, and by the higher bits to the corresponding bits; its input to the digital generator of the reference sinusoidal code from O to 90 °, the outputs of the binary parallel the code of which is connected to the inputs of parallel recording of pulse counters, and the control inputs of the code switch are connected to the outputs of the synchronizer. Sources of information taken into account in the examination 1st Second Certificate of the USSR 325719, cl. N OZK 5/156, 1970. 2 USSR author's certificate No. 362448, cl. N OZK 5/156, 1970.