SU459863A1 - Information extractor from the phase-shift keyed signal - Google Patents

Description

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FIELD OF THE INVENTION The invention relates to radio communications, radionavigation, and radar, in particular, to discrete information transmission lines with a phase-shift keyed signal.

There is a known information extractor from a phase-manipulated signal, the principle of action of which is based on measuring averaged values of trigonometric functions of a phase over an interval shorter than the duration of a message. This device allows determining both the sign of the information symbols by calculating the sum of pairwise products of the obtained values of the compared phases, and the sign of the correction signal for the symbolic Synchronization device by calculating the difference of the modules or their squares of the group signal vector, which are measured at the integration intervals that do not coincide with the above changes .

The known information extractor contains serially connected correlator, average phase calculator, phase difference calculator of adjacent parcels and a descriptor of phase-shifting signals and a clock signal generator, whose outputs are connected simultaneously to the corresponding one, their inputs of the correlator and middle phase calculator, and a phase output is connected to the clock generator input discriminator.

The purpose of the invention — improving the noise immunity of the device — is achieved by the fact that the phase discriminator of the proposed information extractor consists of a decoder for the sign of the phase difference of the compared packages, a multiplier and a calculator of the difference for the half-send and the entire package.

The block diagram of the device shown in the drawing.

The proposed information extractor contains a correlator 1, a middle phase calculator 2, a phase difference calculator of adjacent parcels 3, a phase-shifting signal decoder 4, a sync signal generator 5, a phase discriminator 6 consisting of a phase difference decoder -comparable parcels 7, a phase difference calculator for a parse pair and the whole parcel 8 and multiplier 9.

The correlator 1 and the calculator of the average phase 2, in contrast to the corresponding blocks of the known devices, provide a measurement of the values of the average phase for the semi-sending and all

the parcel. The operation of these devices is controlled by the reference signals of the clock signal generator 5. From the output 10 of the average phase calculator, 2 values of the average phases of the received packages are fed to the input of the phase difference calculator

neighboring parcels 3.

The phase-shifting signal decoder 4 converts the results of calculating the phase difference (output 11) into information symbols arriving at the output of the device.

The phase correction signal by which the symbol synchronization device 5 is tuned is generated by the phase discriminator 6. The phase discriminator device 8 calculates the difference of the averaged values of the phases measured by the average phase calculator 2 within the half-send and the whole package. The values of the phases for the half package and the entire package are removed from the outputs 12 and 10, respectively. The output signal of the device 8 is determined by both the absolute value and the sign of the phase mismatch, and the sign of the difference in the averaged values of the phases of the compared packages. The formation of the phase correction signal in the proposed information separator from the phase-shifted signal is performed by logical multiplying the output signal of the device 8 with the sign of the phase difference of the compared parcels obtained at the output of the decoder 7. This multiplication is performed by a multiplier 9, to the first input of which a signal comes from the decoder 7 and the second input is a signal from the phase difference calculator for the half-send and the whole package 8.

Subject invention

An information extractor from a phase-shift signal containing a series-connected correlator, an average phase calculator, a phase difference calculator of adjacent parcels and a phase-shifting decoder, and a clock generator, the outputs of which are simultaneously connected to the corresponding inputs of the correlator and middle phase calculator, and an output signal of the clock generator phase discriminator, characterized in that, in order to improve noise immunity while simplifying the equipment, AZOV discriminator consists of a decoder of the phase difference plate compared parcels multiplier and a phase difference calculator for poluposylku and the entire package, with

In this case, the output of the phase difference decoder of the compared parcels is connected to one of the multiplier inputs, to another input of which via the phase difference calculator for the half-sending and the whole package are connected respectively to the output of the average phase calculator and the input of the phase difference calculator of the neighboring packages, the other output of which is connected to the input of the sign decoder phase difference of the compared phase discriminator parcels, the output of the phase discriminator multiplier is the output of the latter.