SU369722A1 - RADIO-RECEIVABLE DEVICE OF COMPLEX PERIODIC - Google Patents

Description

one

The invention relates to radio receivers and can be used in communication systems, radar and radio control.

A radio receiving device of complex periodic signals is known, comprising a periodic filter with a multiplier, a balanced mixer, a generator of complex periodic oscillations, and an amplifier, the output of which is the output of the device.

A disadvantage of the known device is the difficulty of obtaining an amplitude response close to the relay using simple radio means.

In order to obtain the amplitude response of the device close to the relay, the output of the amplifier is connected to the inputs of the multiplier of the periodic filter and the generator of complex periodic oscillations through the additionally introduced phase shifters.

FIG. 1 is given a functional diagram of the proposed device; in fig. 2 - its amplitude characteristic.

The radio receiving device of complex periodic signals (Fig. 1) contains a series-connected periodic filter / with multiplier 2, a balanced mixer 3 and a generator 4 of complex periodic oscillations with a multiplier 5, an amplifier 6 and phase shifters 7 and 8.

Periodic filter / and generator 4 complex periodic oscillations are made according to the same structural scheme and consist of amplifier 9, inductors W and 1, resistor 12, capacitor 13 and corresponding multipliers. The output of the periodic filter / connected to the balanced mixer 3, the second input of which receives a signal from the output of the generator 4 periodic oscillations. The output of the amplifier 6, which is the output of the device, is connected to the inputs of the multiplier 2 of the periodic filter / and the multiplier 5 of the generator 4 of complex periodic oscillations through the phase rotation 8 or 7, respectively.

The principle of operation of the receiving device of complex periodic signals is based on the control of the amplitude structure

and the phase spectrum of natural oscillations of a periodic filter / and generator 4 complex periodic oscillations. In the periodic filter 1, the voltage change on the capacitor 13 occurs in accordance with

following differential equation

(J + a,) - i- co2f 1 + sh b, x (f),

where Ci, (oo, bo are some constant values; JJ (t) is the voltage across the capacitor;

X (i) is the radio signal at the receiver input;

/ (t) is the oscillation supplied to the input of the multiplier and determining the form of the filter's natural oscillations.

The processors in the generator 4 complex periodic oscillations are described by the Hill’s differential equation.

Under the action of a complex radio signal at the input of the device, the central component of the spectrum of which coincides with the resonant frequency of periodic filter 1, a harmonic oscillation occurs at the output of amplifier 6, changing the form of natural oscillations of periodic filter / and generator 4 of complex periodic oscillations. If the amplitude spectrum of the signal at the input of the device corresponds to the amplitude spectrum of the natural oscillations of the periodic filter / and generator 4, the intensity of the harmonic oscillation at the output of the amplifier 6 increases due to the addition of the energy of the side components of the input oscillation spectrum. By increasing the intensity of a complex radio signal at the input of the device, the amplitude of oscillations at the output of amplifier 6 increases, which leads to a change in the phase spectra of natural oscillations of the periodic filter 1 and generator 4, which approach the structure of the phase spectrum of the radio signal at the input of the device.

At a certain intensity of the radio signal at the input, the structure of its phase spectrum coincides with the structure of the phase spectrum of natural oscillations of the periodic filter 1 and generator 4, resulting in an abrupt coherent transformation of the spectrum of a complex input signal into a harmonic oscillation, which determines the relay form of the amplitude characteristic of the device (Fig 2). Here, the magnitude is plotted on the abscissa, proportional to the square root of the signal power at the input, but the ordinate axis is the amplitude of the harmonic oscillation at the device output. A further increase in the intensity of the radio signal at the input practically does not lead to a change in the amplitude of the harmonic oscillations on the output of the amplifier 6; amplitude stabilization occurs due to control

the phase spectrum of the natural oscillations of the periodic filter / and generator 4. The amplitude is stabilized only within certain limits of the input signal intensity at the output, for which a breakdown occurs

coherent spectrum conversion of the complex input signal, and the amplitude of the harmonic oscillations at the output of amplifier 6 is reduced. Stabilizing the amplitude of the harmonic oscillation is provided not only

when you change the intensity of the input signal, but also while changing its parameters.

The initial phase relationships in the device are set using phase shifters 7 and S by changing the phase to within 3 °.

Subject invention

A radio receiver of complex periodic signals containing a series-connected periodic filter with a multiplier, a balanced mixer, the second input of which is connected to the output of a generator of complex periodic oscillations, and an amplifier whose output is a device output, characterized in that, in order to obtain the amplitude response of the device, close to the relay, the output of the amplifier is connected to the inputs of the multiplier of the periodic filter and the generator of complex periodic oscillations through an additional Introduced phase shifters.

FIG. one

Rig. 2