SU1062889A2 - Device for receiving signals with combined frequency-shift and relative-phase-shift keying - Google Patents

Abstract

DEVICE FOR SIGNALS WITH A COMBINATION OF FREQUENCY AND RELATIVE-PHASE 11 ANSWER ON AUTH.S. No. 809643, characterized in that, in order to receive frequency-phase-manipulated signals with frequency manipulation by four, a third multiplier is introduced, a frequency multiplier to an additional adder, the output of the first multiplier is connected to the input of the first narrow-band filter through an additional adder, the second input of which is connected with the output of the third multiplier, one input of which is connected to the output of the bandpass filter, and the other input is connected to the output of the frequency divider by a frequency multiplier of three.

Description

ate

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IfaoepeiTeHHe refers to communication.

According to ocHOBHOfiy avt.ev, no. 809643, a device is known for receiving signals with combined frequency and relatively phase manipulation, comprising a band filter whose output is connected to the input of the frequency detector and the first input of the first multiplier, the outputs of which are connected respectively through the first manipulation filter and the first narrowband filter with the input of the first pulse generator and the first input of the second multiplier, the output of which is connected via the second manipulator to the dion filter connected to the input of the second importer The output of the first narrowband filter is connected to the input of the delay element whose output is connected to the second input of the first multiplier in series-connected adder, the second narrowband filter and frequency divider whose output is connected to the second input of the first multiplier, the first pin of which is connected to the input of the frequency doubler the output of which is connected to the first inputs of the additional multipliers and to the input of the delay unit, the output of which is connected to the second inputs of the additional multipliers, the outputs of the KOT optix are connected to the input of the adder l,

However, the known device does not allow receiving signals with frequency manipulation at four times.

The purpose of the invention is to receive frequency-phase-shift keyed signals with frequency tuning by four.

The goal is achieved by the fact that in a device for receiving signals with a combined frequency and relative-phase manipulation, which contains a bandpass filter whose output is connected to the input of the frequency detector and the first input of the first multiplier, the outputs of which are connected respectively through the first manipulation filter and the first narrow-band filter with the input of the first pulse shaper and the first input of the second jumper, the output of which is connected to the second formate through the second manipulation filter l pulses, while the output of the first narrow-band filter is connected to the input of the delay element, the output of which is connected to the second input of the first multiplier, serially connected adder, second narrow-band filter and frequency divider whose output is connected to the second input of the first multiplier, the first input of which is connected to the input a frequency doubler, the output of which is connected to the first inputs of the additional multiplier and to the input of the delay unit, the outputs of which are connected to the second inputs of the additional multiplication the third multiplier, the frequency multiplier by three and an additional adder, the output of the first multiplexer is connected to the input of the first narrow-band filter through an additional adder, the second input of which is connected to the output of the third multiplier, one input is connected to the output the band-pass filter, and the other input through three frequency multiplier connected to the output of the frequency divider.

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

A device for receiving signals with combined frequency and phase-shift manipulation contains a band-pass filter 1, a frequency detector 2, a first manipulation filter 3, a first driver of 4 pulses, a first multiplier 5, a third multiplier 6, an additional sug-1 math 7, the first narrow-band filter O, delay element 9, second multiplier 10, second manipulation filter 11, second driver 12 pulses, frequency doubler 13, frequency multiplier 14 by three, delay block 15, additional multipliers 16-18, sum; mat 19, the second narrowband filter 20 and the divider 21 frequency.

The device works as follows.

Let the input signal to the device

V-cos (cOotk jl., Tr,

V

VC

where, 3,

those. input signal can have

four frequencies.

The received signal is fed to - the input of a bandpass filter 1, the bandwidth of which is selected taking into account the Doppler frequency shift. Further signal processing is performed on the phase and frequency components.

In frequency detector 2, frequency detection is performed and the detected signal is filtered in the first manipulation filter 3 and fed to the first driver 4 pulses. The quaternary sequence from its output, transmitted with the help of a frequency-controlled (FM) carrier, arrives to the recipient of the information. To process the input signal in phase, the input signal is preliminarily adjusted to the frequency C i) o. For this, frequency doubler 13 is cleared with respect to phase shift manipulation (OOM). The signal from frequency doubler 13 is fed simultaneously to delay unit 15 with ttl outputs so that the delay between the signals at two adjacent outputs is equal to Lc the first inputs of additional multipliers 16-18, the second inputs of KOTOPI X receive signals from the corresponding outputs of block 15. V As a result, at the inputs of additional multipliers 16–18, at any interval of 0– T, either the signals of the same frequencies (200, or 2Cj), 2t or 2 (j, or 2034) or signals of different frequencies can be present at the same time. In the first case, among the products of the multiplication, the component is missing at a frequency of 2 icj, if the inputs of the multiplier are signals of neighboring frequencies, (2 Ie and 2 (0 or 2oOi and 2ы2 or 2 (Oil and 2cjij), such component is selects from a narrowband filter 20. If you choose the number of outputs of a delay block 15 (q such that at least one frequency change of the frequency of the 1st volt from the gray one (2Ga to 200 or 2y) occurs on the time interval T (by 2x2 or 2 GOij) ), then at any moment of time at the output, one of the additional multipliers 16-18, and therefore The output of sum / iaTopa 19 and narrowband filter 20 will have a voltage of 2DCo. From the output of narrowband filter 2, the signal goes to a 21h divider of the clock, in which the frequency is divided into four.When the input signal arrives at the input signal with frequencies of & W u ,,, cool-V at the output of the first repamphitol, we obtain the voltage with the frequency of COO and (V: VBx "-Vo-VCo K b -Vcoe Vc06 (coOot 1f ll VC05 (Uo t WH and. At the same time, at the output of the third multiplier b after the multiplication,. A -, DY of the oscillations with the frequencies u (jt Q will be the voltage with the frequencies of COD lo) and Wo i 2 4СО. .co5 (uot lbiff -V.cos i V-cos (WotuG)) ttii - -V cos (Uo -2 amp wH +. From the cyr-ir-tti high-frequency oscillations with a narrowband filter 8, the voltage is filtered at the oo V.V.cos (. When a signal arrives at the device input with a frequency (+. I, the output of the first multiplier 5 is v; w.co9 (). Cos-t.: V-co5 6Job + i + V-cos (Wo -t3 & w) t + fl. At the output of the third multiplier 6, there will be oscillations with frequencies of II g / PI - ibCO V V-C05 (Wot - 7) T V-COs (, Wc,) V.C05UoOot NCO.) In this case, at the output of narrow-band filter 8, we obtain v ;;, - v.coB (woMi). Thus, at the output of narrow-band filter 8, regardless of the frequency The pulsing signal is always present (OFP) at a constant frequency of COO, which is fed to the phase demodulator formed by the second multiplier 10, delay element 9 and the second manipulation filter 11. The binary sequence from its output through the second pulse generator 12 goes to the receiver of information. Thus, the introduction of a frequency multiplier into the device into three, a third multiplier and an additional adder allows demodulation of signals with frequency manipulation by four.

Claims (1)

COMBINED FREQUENCY RECEIVER AND RELATIVE PHASE MANIPULATION by ed. No. 809643, characterized in that, in order to receive frequency-phase-shifted signals with frequency manipulation by four, a third multiplier is introduced, a frequency multiplier by three_and an additional adder, the output of the first multiplier connected to the input of the first narrow-band filter through an additional adder, the second input of which is connected to the output of the third multiplier, one input of which is connected to the output of the bandpass filter, and the other input, through the frequency multiplier, is connected by three to the output of the frequency divider. SU 1962889