SU1432792A1 - Device for automatic monitoring of radio receiver sensitivity - Google Patents

Abstract

The invention of the invention of radio measuring technique. The purpose of the invention is to reduce the time of control. The device contains a local oscillator frequency remover 1, a mixer 2, a band-pass filter 3, a voltage stabilization unit 4, a controlled attenuator 5, a data processing unit 6, a tunable frequency generator 7, a noise meter 8, a shaping unit 9, a predetermined signal ratio value / noise, iO key, memory element P, comparator 12, integrators 13 and 17, switch 14, reference voltage source 15, voltage driver 16 single pulses. The comparator 12 controls the operation of the integrators 13 and 17 through a switch 14, which alternately increase the voltage at the output when connected to the inputs through the switch 14 from the voltage source 15, the voltage of the integrator 13 acts simultaneously on the control inputs of the attenuator 3, providing at the output the radio receiver 18 has a voltage level equal to the reference one and to the measurement input of the processing unit 6 for measuring, processing and recording. The goal is achieved by the introduction of integrators 13 and 17 and the source 15. 2 Il. (L

Description

with N9 ×

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one

The invention relates to radio-noise technology and is used in automated control systems for radio receivers.

The purpose of the invention is to reduce the time control.

FIG. Figure 1 shows the structural electrical circuit of the device; in fig. 2 - voltage level shws, which remove his work.

The device for automated monitoring of the sensitivity of radio receivers contains a local oscillator frequency remover 1, a mixer 2, a band-pass filter 3, a voltage stabilization unit 4 (BSN), a controlled attenuator 5, a data processing unit 6 (WAT), a tuner frequency tuner 7 (HIT), a meter 8 noise, signal-to-noise ratio set-up unit 9, key 10, memory 11, comparator 12, first integrator 13, switch 14 voltage source 15, generator of 16 single pulses, second integrator 17, controlled by Adio receiver 18.

The device works as follows.

When any tuning range of the monitored radio receiver 18 is turned on, the voltage of its heteroad through puller 1 (Fig. 1} is fed to the input of the mixer 2, the other input of the mixer 2 is supplied from the generator 7, whose frequency can be tuned under the control of the output voltage of the second integra - torus 17 within the range of possible changes in the intermediate frequency of the monitored radio receiver 18; From the output of the mixer 2, two frequencies equal to the sum or difference of the frequencies of the reTeropine of the monitored radio receiver 18 and the generator 7 in the gap 3 are bandpass filter that passes the sum or difference frequency depending on whether the oscillator frequency is above or below a received signal, Taki, the output of the bandpass filter 3 is straight zhenye Ka frequency approximately rav10

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35 40 j sup and second integrators 13 and 17 provide alternate voltage rise at the output when connected to the inputs via a voltage switch 14 from source 15. Comparator 12, comparing the reference voltage from the output of the storage element 11 and the output voltage of the monitored radio receiver 18, through switch 14 controls the operation of the first and second integrators 13 and 17. The output voltage of the first integrator 13 acts through a control input on the controlled attenuator 5, providing, at the output of the controlled, diode The voltage level is equal to the reference voltage. The control voltage, equivalent to the voltage at the antenna input of the monitored radio receiver 18, is also output from the output of the first integrator 13 to the measurement input of the unit 6 for measurement, processing and recording.

At time t, the impulse Setting zero (Fig.2a) returns the storage element 11 to the initial state and starts the shaper 16, which with its impulse (fig.2b) leads and maintains the initial state of the first integrator 13 (fig.2d) and the second integrator 17 (FIG. 2e) and for a time up to tj connects storage element 1 to the output of the monitored radio receiver 18 through block 9 and key 10. Pulse duration of the generator of 16 times the time required to measure the noise level of the voltage level of the monitored radio receiver 18 It is measured by meter 8, changed by block 9 and stored through key 10 by memory element 11 and applied to one of the inputs of comparator 12. At time t, the falling front of the driver 16 allows the first and second integrators 13 and 17 to work. the moment is connected via switch 14 to the second integrator 17, the voltage build-up at its output begins (FIG. 2 e) and, therefore, the voltage frequency at the output of generator 7. At time tj, when voltage

The maximum frequency at which the gain outside the output of the monitored radio controlled radio receiver 18 is greatest is that Block 4 ensures that the voltage of this frequency is constant at the input of the controlled attenuator 5. The receiver 18 reaches the reference voltage Uoti (Fig. 2c), the comparator 12 is triggered (Fig. 2d), which by the switch 14 turns off the second inv at the output of the monitored radio receiver 18 reaches the reference voltage Uoti (Fig. 2b), a comparator 12 (Fig. 2d) is triggered, which by the switch 14 turns off the second integrator 17 from the source 15 and It connects to the first integrator. 13 The voltage increases from its output (Fig. 2d), acting on the control attenuator 5, and consequently, the output signal of the controlled radio receiver 18 decreases. This happens until the voltage at its output

reaches the release threshold of the comparator 12, which, returning to the initial state (Fig. 2d), reconnects the second integrator 17 to the source 15, disconnecting the first integrator 13 therefrom, while the level of the control voltage at its output remains. The leading edge of the pulse of the comparator 12 starts the block 6 into the cycle of measuring the frequency and output voltage of the first integrator 13. Next, the operation of the device cyclically repeats until time t corresponding to the tuning at the frequency at which the gain of the controlled radio receiver 18 is greatest (Fig. 2c). after the next switching of the source 15 to the second integrator 17, the comparator 12 will not change its state (Fig 2 g), since the voltage level at the output of the monitored radio receiver 18 will decrease c is less than op (2 The voltage at the output of the first integrator 13 will remain unchanged and will correspond to the receiver sensitivity parameter by tuning to the maximum gain frequency at a given signal-to-noise ratio.

Claims (1)

Invention Formula An automatic device for monitoring the sensitivity of radio receivers containing a data processing unit, a tunable frequency generator, a comparator, a single pulse shaper, and a switch. Q g 0 5 O 0 five 5 sequentially connected noise meter, unit for generating a predetermined signal / gaum ratio, key and storage element connected in series with a LO oscillator, whose input is a heterodyne output of a controlled radio receiver, a mixer, the second input of which is connected to the output of a tunable frequency generator, a bandpass filter, a stabilization unit voltage and controlled attenuator, the output of which is the input of the monitored radio receiver, the output of the bandpass filter is connected to the first inf A data input of the processing unit, characterized in that, in order to reduce the monitoring time, a reference voltage source is inputted, the output of which is connected to the information input of the switch, the first integrator, the information input and output of which are connected respectively to the first output of the switch and the control input controlled attenuator, the second integrator, information input and output of which are connected respectively to the second output of the switch and the control input of the tunable frequency generator the output of the single pulse generator is connected to the control inputs of the first and second integrators and the key, the first and second inputs and the output of the comparator are connected respectively to the outputs of the monitored radio receiver, the memory element and the control inputs of the switch and the processing unit, the second information input of which connected to the output of the first integrator, the input of the noise meter is the main output of the monitored radio receiver, the second input of the storage element and the input of the unit single mpulsov are usta- novochnm input device.