SU1628208A1 - Device for wideband signal correlation processing - Google Patents

Abstract

This invention relates to a radio technology with broadband signals. The purpose of the invention is to increase the bandwidth and increase the noise immunity with constant speed and bit of the analog-digital converter. The device contains a blocking unit for impulse noise, bandpass filters 2, blocks 3 frequency converters, filters 4 low frequencies, analog-digital converters 5, registers 6, blocks 7 multiplication, blocks 8 fast Fourier transforms, adder 9. The device also turns on blocking 10 narrowband interference, the correlator 11, the reference signal generating unit 12, the threshold unit 13, the transfer signal generators 14, the 15 clock pulse generator and the 16 reference frequency synthesizer. The device suppresses powerful harmonic interference, and by pre-filtering the signal in filters 2 and 4 and blocks 3, the efficiency of using the dynamic range of the converters 5 is improved. 1 sludge. from h (L with

Description

The invention relates to the field of radio communications with broadband signals and can be used in receivers of broadband signals.

The aim of the invention is to increase the bandwidth and increase noise immunity with constant speed and bit depth of an analog-digital converter.

The drawing shows a structural electrical diagram of a device for correlation processing of a broadband signal "

The correlation processing device for a broadband signal contains a blocking unit 1 for pulse interference blanking, bandpass filters 2.1-2.N, frequency conversion units 3.1-3.N, ^ low-frequency filters 4.1-4.N, ADC

5.1-5.N, registers 6.1-6.N, multiplication blocks 7.17.N, fast Fourier transform blocks 8.1-8.N, adder 9, narrowband interference blanking unit 10, correlator 11, reference signal generating unit 12, threshold block 13 , shapers 14.1-14.N transfer signal, a clock generator 15, a synthesizer 16 reference frequencies.

A correlation processing device for a broadband signal operates as follows.

The input mixture of the fluctuation, impulse noise signal is supplied to the pulse interference blanking unit 1. From the output of blocking unit 1 and impulse noise, the mixture of the input signal, fluctuation and lumped interference goes simultaneously to bandpass filters 2.1-2.N, which divide the input signal range into N subbands. Band-pass filters must have a linear total frequency response and phase response. The signal from the output of the bandpass filters is fed to the inputs of the blocks 3.1-3.N frequency conversion.

From the output of the synthesizer 16 reference frequencies to the inputs of blocks 3.1-3.N receives a synchronous reference oscillation. Since the reference oscillation arrives at N blocks 3.1-3.N of the frequency conversion at the same time, the total signal at their outputs preserves the phase relationships of the input signal.

From the output of the frequency conversion blocks 3.1-3.N, the signal is fed to the inputs of N filters 4.1-4.N low frequencies with a cutoff frequency equal to fo / 2 and determined by the frequency band in the filters 4.1-4.N low frequencies. In this case, 2 · Δί, where Δί is the passband of the band-pass filter of the i-ro subband. The GVZ of filters 4.1-4.N of low frequencies should be identical on all bandwidth.

The signal from the output of filters 4.1-4.N low frequencies is fed to the input of the ADC

5.1-5.N, where the signal is converted to digital form.

The signal from the ADC output goes to registers 6.1-6.N, the first input of which receives a control signal with a frequency fa. The output signal of the registers 6.1-6.N is supplied to the first input of the multiplication blocks 7.1-7.N, the second input of which receives the signal from the output of the shapers 14.1-14.N of the transfer signal. In blocks 7.1-7.N of multiplication, the input signal is transferred back to the carrier frequency.

The signal from the output of the blocks 7.1-7.N of the multiplication is supplied to the second inputs of the blocks 8.1-8.N of the fast Fourier transform, in which the samples of the input signal in each channel are converted from time to frequency domain.

The samples of the spectrum of the signal from the output of blocks 8.1-8.N of the fast Fourier transform are simultaneously and simultaneously fed to the adder 9, in which the summation of the samples corresponding to the same frequencies at the output of N channels occurs.

The reconstructed spectrum of the original input signal is fed to the input _k of the narrow-band interference blanking unit 10, where the spectral components of these interference are suppressed. In the spectrum of a signal mixture, fluctuation and lumped interference, the spectral components of narrowband interference are pulses that are significantly superior in amplitude to other spectral components.

The samples of the signal from the output of block 10 blanking narrowband interference in parallel are fed to the first input of the correlator 11.

Claims (1)

Claim 55 A correlation processing device for broadband signals, comprising a pulse interference blanking unit, an analog-to-digital converter (ADC), a fast Fourier transform unit, series-connected narrowband interference blanking unit, a correlator, threshold block, the second input of the correlator is connected to the output of the generating unit reference signal, characterized in that, in order to increase bandwidth and improve noise immunity with constant speed and resolution of the analog-to-digital convert la, introduced N bandpass filters, N inverters, N low-pass filters, Ν-1 ADCs, -N registers, N multipliers, Ν-1 FFT blocks ^-, N formers carry signal, the synthesizer reference signal, a clock pulse generator and an adder whose outputs are connected to the inputs of the narrowband interference blanking unit, while the output of the pulse interference blanking unit through N bandpass filters is connected respectively to the first inputs of N frequency conversion units, the output of which is connected to the second inputs q synthesizer; reference signals, and the outputs of N frequency conversion blocks through the corresponding low-pass filter are connected to the first inputs of N ADCs, to the second inputs of which and the first inputs of registers the first output of the clock generator is connected, and the outputs of N ADCs are connected to the second inputs of the corresponding registers, the outputs of which are connected to the first inputs of the corresponding multiplication blocks, to the second inputs of which the outputs of the corresponding N shapers of transfer signals are connected, to the inputs of which and the first inputs of N blocks of fast conversion mations Fourier generator 20 connected to the second output. clock pulses, while the outputs of N multiplication units are connected to the second inputs of the corresponding blocks of the fast Fourier transform, the outputs of which are connected to the inputs of the adder.