SU849124A1 - Fm radio pulse processing device - Google Patents

Description

Ieobretenve relate to the radio technician in can be used to process tea-modulated signals. A device for processing a frequency modulated radio pulse, a high frequency accelerator, and a frequency module sequentially connected, an LO, a mixer, an intermediate frequency amplifier, and an spectrum expander are known. However, in a retrofitting device, as the linearly-partly-mouted (LFM) pulses are removed from the center of the resolution section to the edges, a lateral lepespec of the demodulated pulse spectrum is observed. The purpose of the invention is to reduce the side lobe of the output spectrum of the signal. The delivered pell is achieved by the fact that a frequency-modulated frequency pulse and a frequency amplifier were included in the device for the frequency-modulated radio pulse (and the teiibHo included a frequency-modulated heterodyne, mixer, intermediate frequency amplifier and spectrum analyzer, a frequency-weight unit connected between the high-frequency amplifier frequency and the second input of the mixer.In addition, the frequency-weight blzh contains the first delay line, the serially connected deadhead divider, the second delay line, the first attenuator, the phase rotation The adder and the adder and the series-connected inputs (an attenuator and a second phase shifter, the second output of the power splitter is connected to the input of the second attenuator, the output of the second phase shifter is connected to the second input of the adder, the third output of the power splitter is connected to the third input of the adder via the first delay line. The drawing shows Structural electrical circuit of the device. The device contains a high-frequency amplifier 1 (UHF), a frequency-modulated local oscillator 2, a mixer 3, an intermediate-frequency amplifier 4 (U IF), analyz 5 spectrum, frequency and weight block 6, consisting of the first delay line 7, splitter 8 traffic control, second line 9 backside, first attenuator 10, first phase shifter 11, adder 12, second attenuator 13, second phase shifter 14.

The device works as follows.

The transmission line, established between UHF 1 and smesigepem 3, has the form of amping-hourly characteristics in the ymede of the Hamming function. For this value, the delay lines 7 and 9 are chosen from the condition that the delay in the channel with delay line 9 is the value in the channel with delay line 7 - the value of §7 relative to the channel with attenuator 13 and phase shifter 14, the ratio in transmission coefficients the specified channels are set as 1; O, 425j 6.425 using attenuators GO and 13. The initial phases in the channels are selected with the help of bazoschs) of the shells 11 and 14. Segments of a regular waveguide, the length of the coils, for example, with Sh / ZOO M / Ha does not exceed 0, 3 and 0.6 m.

Since the product of the deviation of the frequency and the duration of the chirp pulse is large, the spectrum and the envelope of the pulse at the input of the mixer 3 has the shape of the Hamming function and does not depend on the location of the target in the placement area. GneKtp of all of the processed, demodulated pulses has a symmetric FSMA with small tank lobes.

Thus, the proposed device differs from the known one in that between UHF 1 and mixer 3 a transmission line is included with the amplitude-frequency characteristic as. Hamming functions, while UHF 1 and UPCH 4 operate in a constant mode, and the module qqp weight function -1 -1 is absent.

The invention makes it possible to reduce the side lobes of the spectrum of signals positioned throughout the resolution resolution - 25 to the level of side lobes of the spectrum.

The signal located in the center of the resolution section is 40; moreover, the resolution is increased at a selected distance section and the dynamic range of the device is increased by increasing the signal-to-noise ratio by 10-15 dB.

F

formula of invention

Claims (2)

1. A device for processing frequency-modulated radio pulses containing a high-frequency amplifier and a series-connected frequency-modulated local oscillator, a mixer, an intermediate frequency amplifier and a spectrum analyzer, characterized in that, in order to reduce the side lobes of the output signal spectrum, a frequency-weight unit is introduced , connected between the amplifier of the high frequency and the second input of the mixer. 2. The device according to claim 1, that is, with the fact that the frequency-weight ratio is the first line / delay; a power splitter, a second delay line, a first attenuator, a first phase shifter and an adder, and a second attenuator and a second phase shifter connected in series; the output of the power divider is connected to the input of the second attenuator, the output of the second phase shifter is connected to the second input of the adder The third power splitter with the third input of the adder through the first delay line. Sources of information taken into account in the examination 1. Timis et al. Pulse squeezer for radar tracking. Foreign radio electronics, 1964, No. 11, p. 36 inc. 7 (prototype).