SU1700754A1 - Broadband signals correlation processing unit - Google Patents

Abstract

The invention relates to radio engineering and can be used in the processing of broadband signals. The purpose of the invention is to improve noise immunity when exposed to strong interference. The device contains serially connected subtractor, first cutter, notch filter, second multiplier and phase synchronous filter, signal copy generator, delay line and first filter. From the incoming input mix of the wideband signal and the narrowband interference, the first multiplier, a resistor filter tuned to the carrier frequency, and the second multiplier generate an interference voltage, which is fed to the reference input of the synchronous-phase filter, the output of which is due to the narrowband filtering interference evaluation voltage that compensates for the latter in the subtractor. 1 il.

Description

The invention relates to the field of radio engineering and can be used in the processing of broadband signals.

The purpose of the invention is to improve noise immunity when exposed to strong interference.

The drawing shows a structural electrical circuit of the device.

The device for the correlation processing of broadband signals contains a calculator 1, the first multiplier 2, the generator 3 copies of the signal, the notch filter 4, the second multiplier 5, the delay line b, the synchronous phase filter 7, the first filter 8.

The synchronous phase filter 7 contains a phase shifter 7.0, a third multiplier 7.1, a second filter 7.2, a fourth multiplier 7.3, a fifth multiplier 7.4, a third filter 7.5, a sixth multiplier 7.6, and an adder 7.7.

The device works as follows.

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An additive mixture of a broadband signal and a quasi-harmonic interference is fed to the input of the device at the first subtractor 1. At the output of the first multiplier 2, the broadband signal is multiplied with a copy of the modulating pseudo-random sequence generated by the generator of the 3 copies of the signal and converted into a narrowband signal whose frequency has notch filter 4. And the noise component, on the contrary, acquires an additional modulation, due to which its spectrum becomes broadband and practically doesn’t claim zhaets rezhektorchym filter 4. At the output of the second multiplier 5 occurs howling noise-recovery component by multiplying the secondary with the pseudorandom sequence. Line 6 Delay Required

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The signal is taken into account in units 2 and 4. Thus, the voltage at the frequency of the disturbance is restored at the multiplier output. At the same time, there is no signal voltage, since the latter is filtered by notch filter 4. In the synchronous-phase filter 7, which has the restored voltage interference from the multiplier 5 output, the voltage is filtered out by narrowband filters 7.2 and 7.5. the broadband signal and at the output of the adder 7.7, the voltage clutter is restored. Last, fed to the second input of the subtractor 1, provides compensation for interference in the received signal. The transmission ratio of the noise reduction copy circuit, blocks 4-7, is selected from the condition of maximum interference suppression. Multipliers 7.1. 7.3, 7.4 and 7.6 operate in the limiting mode on their reference inputs and linear mode on the signal inputs. Filter 8

provides filtering of the signal after removing the pseudo-random modulation on multiplier 2.

Claims (1)

Invention Formula A device for the correlation processing of broadband signals, containing series-connected signals, the first multiplier, notch filter and the second multiplier, the output of the first multiplier is connected to the input of the first filter, the second input of the first multiplier is connected to the output of the generator copies of the signal and through the delay line with the second input of the second multiplier, characterized in that, in order to improve immunity, a synchronous-phase filter is introduced, the signal input of which is connected to the first input of the subtractor, and the output with the second input of the subtractor, the reference input of the synchronous-phase the filter is connected to the output of the second multiplier.