SU1511716A1 - Apparatus for automatic measurement of sensitivity of receiver of discrete signals - Google Patents

Abstract

The invention can be used to automatically measure the parameters of discrete signal receivers. The purpose of the invention is the extension of functionality, which consists in measuring the sensitivity of a discrete signal receiver in the course of its operation for its main purpose, achieved by automating the measurement process. The operation of the device is synchronized by pulses arriving at the input of the control unit 6. In the first cycle, the signal conversion unit 4 and the digital processing unit 5 analyze the signal from the receiver output 3 discrete signals to the input of which antenna 1 is connected via the directional coupler 2. In the second cycle, the signal generator 7 switches on the signal generator 7, the output of which is connected to the second the input of the directional coupler 2. From the difference in voltage from the output of the receiver 3 in the first and second cycles, the digital processing unit 5 calculates the sensitivity value of the receiver 3 discrete signals. 3 il.

Description

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The invention relates to electrical measurements and can be used to automatically measure the parameters of receivers of discrete signals.

The purpose of the invention is to expand the functionality, which is to provide a measurement of the sensitivity of the receiver of discrete signals during the operation of the receiver for its main purpose.

FIG. 1 is a block diagram of the device; in fig. 2 - functional diagrams of a signal conversion unit, a control unit and a digital processing unit; in fig. 3 - diagrams describing the operation of the device.

The device contains serially connected antenna 1, directional coupler 2, receiver 3 of discrete signals, signal conversion unit 4 and digital processing unit 5, as well as control unit 6, the first output of which is connected to the second input of the directional coupler through signal generator 7, The other outputs of the control unit 6 are connected to the corresponding control inputs of the signal conversion unit A and the digital processing unit 5. .

The signal conversion unit 4 (FIG. 2) contains the first key 8 connected in series, the control input of which is connected to the corresponding control input of the control unit 6, and the information input is connected to the output of the receiver 3 of the discrete signals, the operational amplifier 9, analog a digital converter, the clock input of which is connected to the clock output of the control unit 6, the second key 10 and the first integrating chain 11 connected in series, the information input of the second key 10 connected to the information at the output of the first key 8, and a control input connected to a corresponding control output of a control unit 6, the output

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the first integrating chain 11 is connected to the information input of the analog-digital converter, the third key 12 and the second integrating chain 13 are connected in series, and the information input of the third key 12 is connected to the information input of the first key 8, and the control input is connected to the corresponding input

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corresponding to the control output of the control unit 6, the output of the second integrator 1 of the chain 13 is connected to the input of the analog-digital converter 14, the information outputs of which are the information inputs of the digital processing unit 5.

The digital signal processing unit 5 and the control unit 6 are implemented on the microcontroller 15, which can be used as a serial microcontroller K1816BE48,

The device for automatically measuring the sensitivity of the receiver of discrete signals operates as follows:

During operation, the receiver 3 discrete signals under the influence of various factors and causes (changes in the parameters or characteristics of the elements, the impact of external active noise interference, etc.) changes the sensitivity, which in turn affects the performance of the radio system as a whole. This is the reason for the need to automate the measurement of the sensitivity of a discrete signal receiver during its operation.

functioning according to the main purpose.

The device for automatic measurement of the sensitivity of a discrete signal receiver synchronizes the pulses delayed relative to the synchronization pulses of the radio engineering system for time f (Fig. 3, diararma 2) arriving at the synchronization input of the device (INT of the microcontroller 15). 15 executes the program stored in the memory of the microcontroller, starting with the first command

At time t, the microcontroller 15 forms a positive voltage at outputs 16, 17 and 18, corresponding to a logical unit.

The logical unit at the output of the microcontroller 15 (diagram 3, fig. 3) is fed to the control input of the first key 8 and switches on its „First key B connects the input of the operational amplifier 9 to the output of the receiver 3 discrete signals,

The logical unit at the output P13 of the microcontroller 15 (diagram 4) is fed to the control input of the second key 10 and turns it on. Second

The key 10 connects the first integrating switch 11 to the output of the first key 8.

An integrator consisting of an operational amplifier 9 and the first integrating chain 11 integrates the receiver output voltage of 3 discrete signals during a time interval {,, The voltage value at the integrator output characterizes the average noise voltage level at the receiver output 3 discrete signals. The constant time of the first integrating chain 11 is chosen longer than the useful signal duration.

At time t, the negative pulse front at output 18 of the microcontroller 15 (diagram 7) starts analog-digital converter 14, which converts analog voltage 11 at the integrator's output into digital form and hty supplies the number code to the information inputs 20-27 of the microcontroller 15 "B t the microcontroller 15 generates a positive voltage at the output 19, which synchronizes the operation of the signal generator 7 The signal generator 7 generates a control signal. A directional coupler 2 sends a pilot signal to the receiver input of 3 discrete signals.

At t, the controller 15 forms at the output (diagram 5) a logical unit that goes to the control input of the third key 12. The third key 12 connects to the output of the first key 8 a second integrating chain 13, the time constant of which is chosen equal to the duration of the useful signal. At this time, the second key 10 disables the first integrating chain 11 from the output of the first key 8

The integrator, consisting of an operational amplifier 9 and a second integrating chain 13, integrates the output voltage of the receiver 3 discrete signals in the time interval Dj. At this time, the voltage at the output of the receiver 3 discrete signals represents the sum of the voltages of the mind and the control signal.

In t analog-to-digital converter, the device 14 converts the analogue output U into a digital code and t

supplies it to the information inputs 20-27 of the microcontroller 15 ;,

The microcontroller 15 processes the received data (U ,, U) according to the following algorithm.

After entering the values of U, and U ,, the difference is calculated, and, - and, and is stored at A.

Further, the voltage value U is multiplied by a constant C. Its value is calculated for a specific type of receiver 3 discrete signals. The value C is numerically equal to the voltage,

generated on the input impedance of the input circuit of the receiver generator 7 signals about

The receiver sensitivity is then calculated. 3 discrete

signals and results in digital processing to the radio system

Upon arrival at the sync input of the device pulse from

Claims (1)

radio system, the microcontroller 15 starts performing the tools. from the first command and the device operation is repeated. The formula of the invention Device for automatic measuring the sensitivity of a receiver of discrete signals, containing a signal generator, terminals for connecting a receiver of discrete signals Catching and control unit, characterized in that, in order to expand its functionality, serially connected signal conversion unit and digital processing unit, serially connected antenna are introduced into it Their directional coupler, the second input of which is connected to the generator output signals, and the output through the terminals for connecting the receiver of discrete signals is connected to the input of the signal conversion unit, and you. strokes, control unit connected to corresponding to 1-5M control inputs of the signal generator, signal conversion unit and digital processing unit, the input of the control unit being the control input the device, the input of the conversion unit is the first output, and the output of the digital processing unit is the second output of the device. RTS 5 / .3 Editor A. Dolinich Compiled by N. Mikhalev Tehred M.Dndyk Proofreader M. Sharoshi Order 5900/50 Circulation 714 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab, d 4/5 3 tf t. Subscription