SU1688416A1 - Correlation processing unit for broadband signals affected by narrow- band interference - Google Patents

Abstract

The invention relates to radio engineering and can be used in communication systems with broadband signals. The purpose of the invention is to increase the power ratio of a wideband signal to the power of narrowband interference. The device for the correlation processing of a broadband signal in the presence of E-band interference contains multipliers 1. 3, 15, generator 2 copies of the broadband signal, notch filter 4, output filter 5, attenuators 6, 12, calculator 7, elements 8, 9, 16, 13 delays, bandpass filters 10, keys 11, narrowband interference detectors 14, frequency channels 17. The device almost completely suppresses narrowband interference at the output, thus ensuring the achievement of the circuit. 1 il.

Description

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The invention relates to radio engineering and can be used in communication systems with broadband signals.

The purpose of the invention is to increase the power ratio of a wideband signal to the power of narrowband interference.

The drawing shows a block diagram of a device for the correlation processing of a wideband signal in the presence of high-band interference

The device for the correlation processing of a broadband signal in the presence of narrowband interference contains the first multiplier 1, the generator 2 copies of the broadband signal, the second multiplier 3, the notch filter 4, the output filter 5, the first attenuator 6, the subtractor 7, the first delay element 8, the second delay element 9, bandpass filters 10,

the keys 11, the second attenuators 12, the fourth delay elements 13, the narrow-band interference detectors 14, the third multiplier 15, the third delay element 16, the frequency channels 17.

The device works as follows.

The wideband noise-freezing input signal (PSS) and the disturbance are fed to the input of multiplier 1. where it is multiplied with a copy of the PTS synchronized with the incoming PSS formed in the generator 2. Due to this, the PSS is minimized into a narrow-band signal that is rejected by a notch filter 4 and narrowband interference is smeared into wideband interference, which, through a notch filter 4, cutting out the band L F (where L F is the band of the minimized useful signal), post 00 00

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It goes to multiplier 3. In multiplier 3, the broadband interference is multiplied with a synchronous copy of the PSS supplied to it from the output of the generator 2 through the element 8, which ensures the equalization of the delays in the path of the common PSS and the copy of the PSS.

By multiplying the copy of the PSS, the wideband interference is minimized to narrowband interference, which is fed to the N frequency channels 17. In each frequency channel 17, the narrowband interference is filtered in a partial band of the bandpass filter 10 equal to

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where Af is the PSS band, after which it is sent to key 11, which is opened only if the detector 14 makes a decision to detect interference in this pair of channels. Interference through the key And through the attenuator 12 and the delay element 13 is fed to one of the inputs in subtraction 7, where it compensates for the interference to the other input of the subtractor 7 from the device input through the attenuator 6 and element 9. Elements 9,13 and attenuators 6 and 12 provide amplitude and time alignment of the noise coming to the different inputs of the subtractor 7. As one input of the subtractor 7 receives a wideband signal and a narrowband interference, and the other only a narrowband interference, the interference will be compensated for dit the output of the subtractor 7. When multiplication in multiplier 15 with copy PNS output from the generator 2 through the element 16, the wideband signal svo- rachivaets a narrowband signal which is filtered in an output filter 5 and then supplied to the output device. The delay of the element 16 is chosen in such a way as to ensure synchronism of the broadband signal and the copy of the PSS at the inputs of the multiplier 15

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Thus, narrowband interference is almost completely suppressed at the output of the device.

Claims (1)

Claims A wideband signal correlation device in the presence of narrowband interference, comprising a subtractor, a first multiplier connected in series, a notch filter and a second multiplier, an output filter connected in series to a generator of a copy of the broadband signal whose output is connected to the first input of the first multiplier, and the first a delay element, the output of which is connected to another input of the second multiplier, characterized in that, in order to increase the power ratio a narrowband signal to the power of narrowband interference at the output of the device, the first attenuator connected in series is inputted into it, the input of which is connected to the second input of the first multiplier and is the input of the device, and the second delay element whose output is connected to the input of the decrement subtractor connected in series the third delay element , the input of which is connected to the output of the generator of a copy of the broadband signal, and the third multiplier, the other input of which is connected to the output of the subtractor, and the output is connected to i home of the output filter, N frequency channels whose inputs are connected to the output of the second multiplier, and the outputs are connected to the corresponding inputs of the subtracted subtractor, each frequency channel contains a narrowband interference detector and a series-connected band-pass filter whose input is the input of the frequency channel, and the output is connected the input of the narrowband interference detector, the key whose control input is connected to the output of the narrowband interference detector, the second attenuator and the fourth delay element, the output of the This is the output of the frequency channel. GN1N