Device for measuring two-signal characteristics frequency selectivity of the radio to block and cross-distortion

 

(57) Abstract:

Usage: in the field of radio engineering, in particular in the development and adjustment of radio receivers. The inventive device has connected in series generator low frequency signals, the managed switch, the amplitude modulator, the signal input of which is connected to the signal generator and the output to the block matching, the output of which is the entrance of the investigated radio. The unit of comparison is connected to the studied radio and driver reference signal. Serially connected second controlled switch, an amplifier, a third controlled switch, a display unit, a controllable oscillator, a second amplitude modulator, an input connected to the first controllable switch. Controlled attenuator connected to the second switch and an electronic switch connected to a threshold element and unit coordination. Connected in series between a block of differentiation and counting trigger connected to the first, second and third switches. The input of frequency detector is the output of the intermediate frequency amplifier of the investigated radio. The output frequency de the ode threshold element. In the device excluded overload investigated radios and provides a definition of frequency side of the receiving channels, which is a technical result. 2 Il.

The invention relates to electrical engineering and can be used when developing and adjusting the radio.

A device for measuring two-signal characteristics frequency selectivity of the radio to block and cross-distortions (see and. C. the USSR N 1053722 on CL H 04 B 17/00, 1981), containing the display unit, the output of which is connected to the input of the controlled oscillator, connected in series, the first amplitude detector, an input connected to the output of the monitored receiver and a threshold element, and the output of the variable attenuator through the adder connected to the output of the monitored receiver, the second amplitude detector, the output of which is connected to the output of the logarithmic amplifier, the first and second generators of sinusoidal signals, the first and second amplitude modulators connected in series block comparison frequency and a trigger controlled attenuator, the amplifier and the switch, thus the output of the controlled oscillator connected to the input of block stavrowsky attenuator and managed key connected to the second input of the adder and the input of the second amplitude detector, the output of the first generator of sinusoidal signals is connected to another input of the comparison frequency and connected in series through the second amplitude modulator and a variable attenuator connected to the first input of the adder, the input unit comparison of frequencies through a trigger connected to the control input of the control key, the output of the second generator of sinusoidal signals through the switch is connected to the control inputs of the first and second amplitude modulators, the output of the threshold element via the amplifier is connected to the control input of the controlled attenuator output of the logarithmic amplifier connected to the input of the display unit, the block comparison of frequencies consists of series-connected phase detector, a narrow-band filter and the third amplitude detector.

However, this device has the disadvantage, due to low reliability and impossibility of simultaneous visual observations and measurements of two-signal characteristics frequency selectivity of the radio to block and cross the distortion associated with the translation of the accounts of the trigger at the moment of switching on the device or in the position of a logical "0" or logical position of its closest analogue to the technical essence and the achieved technical result is a device for measuring two-signal characteristics frequency selectivity of the radio through the blocking and cross-distortions (see A. with. USSR N 1702535, 1991, H 04 B 17/00) containing the threshold element, a controllable oscillator, the first amplitude modulator connected in series generator low frequency signals, the first controlled switch, the second output of which is connected to the modulating input of the first amplitude modulator, the second amplitude modulator, a signal input connected to the output of the controlled oscillator, controlled attenuator, managed key control input connected to the output of the threshold element, and the block matching, a second input connected to the output of the first amplitude modulator, and the output of block matching is the entrance of the investigated radio, the signal generator operating frequency, an input connected to the signal input of the first amplitude modulator, the first block of comparison, the logarithmic amplifier, and the audit trigger, the display unit, the output connected with the control input of the controlled oscillator, the differentiation block, the input and output of which are connected respectively with the output of the display unit and the input of the counting trigger, serially connected band-pass filter, whose input is connected to the output of the controlled oscillator, and a rectifier, the input of which is showing connected also to the first input of the first unit of comparison, the second block comparison and the second controlled switch, the other input and output of which are connected respectively with the output of the first unit of comparison and control input of the controlled attenuator, the third controlled switch, the first and second outputs and an input connected to the first and second inputs of the indication unit and the output of the logarithmic amplifier, the input connected to the output of the second controlled switch, the second inputs of the first and second units of comparison are combined and output the analyzed radio, while the control inputs of the first, second and third controllable switches are combined and connected to the output of the counting trigger.

However, this device also has significant drawbacks, due to the low functionality and high overload input circuits of the investigated radio associated with the inability of the measurement of the frequency of side channels receiving and applying to the input of the investigated radio signal in hundreds and thousands of times its susceptibility on the side receiving channels.

The blocking signal is manifested in a decrease in the gain in the input tructure basic receive channel and does not coincide with the frequency of the Raman channel reception.

The technical result of the invention is to eliminate the overload investigated radios and determine the frequency of side channels. To achieve the above technical result in the device for measuring two-signal characteristics frequency selectivity of the radio to block and cross distortion, containing connected in series generator low frequency signals, the first controlled switch, the first amplitude modulator, the signal input of which is connected to the output of the signal generator operating frequency, and the block matching, the output of which is the entrance of the investigated radio, connected in series, the first unit of comparison, the first and the second input of which is connected to the output of the detector is studied radio and shaper of the reference signal respectively, the second controlled switch, logarithmic amplifier, the third controlled switch, a unit of imitation, the second input is connected with the second output of the third switch controlled oscillator, the second amplitude modulator, the modulating input of which is connected to the second output of the first controlled switch controlled the Atta is the control input and the output of which is connected to the output of the threshold element and a second output block matching, respectively, the second block of comparison, the input and the output of which is connected to the output of the shaper reference signal and the second input of the second controlled switch, respectively, connected in series the differentiation block, the inlet of which is connected to the output of the display unit, and a counting trigger, the output of which is connected to control inputs of the first, second and third controllable switches, the entered frequency detector, the input of which is the output of the intermediate frequency amplifier of the investigated radio valve. The inverter and the element OR the second input and the output of which is connected to the output of the private detector and the input of the threshold element, respectively.

In Fig. 1 shows a block diagram of the device according to the invention, and Fig. 2 is a plot illustrating his work.

Device for measuring two-signal characteristics frequency selectivity of the radio through the block and cross the distortion comprises a generator 1 low frequency signals, first, second and third controllable switches 2.1, 2.2. 2.3, the generator 3 signals of the operating frequency, the first and second modulators 4.1 4.2, unit 5 coordination, performed, for example, in the form of high-frequency tee, the first and in the range of the generator 7, performed, for example, in the form of a sweep-controlled oscillator attenuator 8, made for example on p-i-n diodes, managed key 9 made, for example, to the transistor, the driver 10 of the reference signal is performed, for example, in the form of a constant voltage source, the inverter 11, the element OR 12, made for example on the diodes with the total load, the threshold element 13 made, for example, in the form of a Schmitt trigger, a logarithmic amplifier 14, the frequency detector 15, the valve 16, made for example in the form of a diode load, block 17 differentiation is made, for example, in the form of a differentiating circuit, a counting trigger 18, block 19 of the display, made for example in the form of a two-beam oscilloscope. Shown also investigated the radio 20. This series connected generator 1 low frequency signals, the first controlled switch 2.1, the first amplitude modulator 4.1, the signal output of which is connected to the output of the generator 3 signals of the operating frequency, and block 5 of the agreement, the entrance of which is the entrance of the investigated radio, 20, connected in series, the first unit 6.1 comparison of the first and second inputs of which are connected to the outputs of the detector studied radio 20 and forms the 14, the third controlled switch 2.3, block 19 of the display, a second input connected to the second output of the third switch 2.3-driven generator 7, the second amplitude modulator 4.2, the modulating input of which is connected to the second output of the first controlled switch 2.1, controlled attenuator 8, a control input connected to the output of the second controlled switch 2.2, and managed key 9, the control input and the output of which is connected to the output of the threshold element and a second input unit 5 approval, respectively, the first and second inputs and the output of the second block 6.2 comparison is connected to the outputs of the detector studied radio 20 and the imaging unit 10 of the reference signal and the second input of the second controlled switch 2.2, respectively, are connected to the block 17 differentiation, whose input is connected to the output unit 19 displays, and counting the trigger 18, the output of which is connected to control inputs of the first, second and third controllable switches 2.1, 2.2 and 2.3, are connected to the frequency detector 15, the inlet of which is the output of the amplifier studied radio receiver 20, the valve 16, the inverter 11 and the element OR 12, second input and the output of which is connected as follows.

The sawtooth voltage U1(Fig. 2A) generator horizontal scanner (not shown in Fig. 1) block 19 display at the input of the controlled oscillator 7, provides a smooth change its frequency f (Fig. 2B) in a given range f'-f" frequencies. With the help of the generator 1 low frequency signals, the generator 3 operating frequency and a first amplitude modulator 4.1 on the first input unit 5 approval level is set to amplitude modulated signal X0equal to the sensitivity of the investigated radio receiver 20, and using a controlled oscillator 7, the second amplitude modulator 4.2 and controlled attenuator 8 to the second input unit 5 approval is formed unmodulated amplitude signal X1with the level allowed for input circuits of the investigated radio 20.

In the initial moment of time counting the trigger 18 is in the state of logical "0" (logical "1"), leaving the normally closed contacts of the first, second and third controllable switches 2.1, 2.2 and 2.3 in the closed (open) state. As a result of forming the inputs of block 5 coordination of signals X0and X1at the output of the detector is studied radio 20 vyrabatyvayutsya 10 is supplied reference signal Y0corresponding to the level of the output signal of the investigated radio 20 fed to its input signal, corresponding to its sensitivity X0. The output of the first block 6.1 comparison produces a voltage Y = Y0-Y, which through the normally closed contacts of the second controlled switch 2.2 arrives at the input of the logarithmic amplifier 14 and controlled attenuator 8. However, as the level of the input signal X1the analyzed receiver 20 are positively correlated with the magnitude of the control voltage Y, then rebuilding operated generator 7 according to the frequency when changing the signal level X1corresponds to the frequency dependence of the dynamic range of the investigated radio 20 to block, change the control voltage Y also corresponds to the frequency dependence of the dynamic range of the investigated radio 20 to block. From the output of the logarithmic amplifier 14 voltage U2(Fig. 2B) through the normally closed contacts of the third controlled switch 2.3 routed to the first input unit 19 displays, on the screen which displayed the frequency dependence of the dynamic range of the investigated radio 20 on blakistone side or main receive channel of the investigated radio 20 on the output of its amplifier intermediate frequency voltage is formed intermediate frequency, which is fed to the input of the frequency detector 15 that is configured on the resonant frequency of the intermediate frequency amplifier of the investigated radio 20. The output of the frequency detector 15 is first generated voltage U3the negative half (Fig. 2G), which, passing through the valve 16 and the inverter 11, a negative voltage U4(Fig. 2D) is supplied to the first input of the OR element 12, and its output is input to the threshold element 13. The threshold element 13 is triggered and its output is formed by the voltage U5logic "1" (Fig. 2E), which is supplied to the control input of an electronic key 9. Electronic switch 9 is closed and its output voltage signal X1becomes equal to zero.

In case of reaching the input of the element 13 by the voltage U4(Fig. 2D) of the negative half its threshold voltage U5at its output becomes equal to a logical "0", electronic switch 9 is opened and the signal X1again fed to the input of the investigated radio 20.

In connection with the coincidence frequency of the oscillator 7 with the bandwidth of the investigated radio 20 voltage Y = Y-Y0becomes maximum and the display unit 19 load indication the ow characteristics of the corresponding receive channel of the investigated radio 20. When exceeding the frequency generator 7 resonant frequency of the investigated radio 20 on the output of the frequency detector 15 produces a voltage U3positive half-wave, which, through the OR element 12 is also fed to the input of the threshold element 13. In the case that the voltage level U3(Fig. 2G) threshold element 13 at its output is again generated voltage logical "1" which is fed to the control input of an electronic key 9. Electronic key 9 is locked and the high-frequency signal X1at the entrance of the investigated radio receiver 20 does not enter, and the screen of the indicator 19 electron beam is moved to the maximum level (Fig. 2B).

In the case that the input element 13 of the voltage U4(Fig. 2D) positive half its threshold voltage U5at its output assumes the value of logical "0", electronic switch 9 is opened and its output is again a signal X1that through the block 5 approval is input to the investigated radio receiver 20, and the formation of the frequency dependence of the dynamic range of the investigated radio 20-blocking continues.

At the end of perestroika cha is terenziani and in the form of a pulse U6(Fig. 2ZH) is supplied to the counting input of the trigger 18. Counting the trigger 18 is placed into the position of a logical "1" (logical "0") and outputs its voltage logical "1" which, by acting on the control inputs of the first, second and third controllable switches 2.1, 2.2 and 2.3, translate their normally open contacts in a closed position. This generator 1 low frequency signals is connected to the modulating input of the second amplitude modulator 4.2, and the input and output of the logarithmic amplifier 14 are connected respectively with the output of the second unit 6.2 comparison and the first input unit 19 of the display. On the second input unit 5 matching signal X0becomes unmodulated, and with the help of the generator 1 low frequency signals, operated generator 7, the second amplitude modulator 4.2 on the first input unit 5 matching set of modulated signal X1with the level allowed for input circuits of the investigated radio 20. The sawtooth voltage U1(Fig. 2A) generator horizontal scan block 19 display again provides smooth frequency f of the controlled oscillator 7 in the range of f'-f" frequencies.

The resulting formation on BX who shall serve at the first input of the second unit 6.2 comparison, on the second input is from the output of the shaper 10 is supplied reference signal Y0. The output of the second unit 6.2 comparison voltage is produced Y1= Y-Y0that through the normally open contacts of the second controlled switch 2.2 arrives at the inputs of the controlled attenuator 8 and the logarithmic amplifier 14. However, as the level of the input signal X1studied radio receiver 20 are positively correlated with the magnitude of the control voltage Y1when rebuilding operated generator 7 according to the frequency when changing the signal level X1corresponds to the frequency dependence of the dynamic range of the investigated radio on cross-distortion, changing the control voltage Y1also corresponds to the frequency dependence of the dynamic range of the investigated radio 20 on cross distortion.

From the output of the logarithmic amplifier 14 voltage U2(Fig. 2B, t1- t2through normally open contacts of the third controlled switch 2.3 is supplied to the second input unit 19 displays, on the screen is in logarithmic scale is displayed frequency dependence of the dynamic range of the generator 7 to the lower boundary of f1-f bandwidth side or main receive channel of the investigated radio 20 on the output of its amplifier intermediate frequency voltage is formed intermediate frequency, which is fed to the input of the frequency detector 15 that is configured on the resonant frequency of the investigated radio 20. The output of the frequency detector 15 is first generated voltage U3the negative half (Fig. 2G), which, passing through the valve 16 and the inverter 11, a positive voltage U4(Fig. 2D) is supplied to the first input of the OR element 12, and its output is input to the threshold element 13. The threshold element 13 is triggered and outputs its voltage logical "1" (Fig. 2E), which is supplied to the control input of the electronic signal X becomes equal to zero.

In case of reaching the input of the element 13 by the voltage U4(Fig. 2D) of the negative half its threshold voltage U5at its output becomes equal to a logical "0", electronic switch 9 is opened and the signal X1again fed to the input of the investigated radio 20. In connection with the coincidence frequency of the oscillator 7 with the bandwidth of the investigated radio 20 voltage walk the line fixing the top of amplitude-frequency characteristics of the corresponding channel of the investigated radio 20.

When exceeding the frequency generator 7 resonant frequency of the investigated radio 20 on the output of the frequency detector 15 produces a voltage U3positive half-wave, which, through the OR element 12 is also fed to the input of the threshold element 13. In the case that the voltage level U3(Fig. 2G) threshold element 13 at its output is again generated voltage logical "1" which is fed to the control input of an electronic key 9. Electronic key 9 is locked and the high-frequency signal X1at the entrance of the investigated radio receiver 20 does not enter, and the screen of the indicator 19 electron beam is moved to the maximum level.

In case of reaching the input of the element 13 by the voltage U4(Fig. 2D) positive half its threshold voltage U5at its output assumes the value of logical "0", electronic switch 9 is opened and its output back to a voltage signal X1that through the block 5 approval is input to the investigated radio 20 and the formation of the frequency dependence what about the voltage U1(Fig. 2A) horizontal scan block 19 indicating the frequency of the controlled oscillator 7 is stopped, the cutoff of the sawtooth voltage U1unit 15 differentiation differentiated in the form of voltage U6(Fig. 2ZH) is input to the counting of the trigger 18. Counting the trigger 18 is placed into the position of a logical "0" (logical "1") and outputs its voltage logical "0" which, by acting on the control inputs of the first, second and third controllable switches 2.1, 2.2 and 2.3, translate their normally open contacts in a closed condition. This generator 1 low frequency signals is connected to the modulating input of the first amplitude modulator 4.1, and the input and output of the logarithmic amplifier 14 respectively connected to the output of the first element 6.1 comparison and to the first input unit 10 of the display. Again starts rising sawtooth voltage U1and measurement of the frequency dependence of the dynamic range of the investigated radio 20 to block repeats.

The change of state of the accounts of the trigger 18 change the position of the contacts of the first, second and third controllable switches that bring the x dependency of the dynamic range of the investigated radio 20 for blocking and cross-distortion with cuts lines, fixing the peaks of the amplitude-frequency characteristics of the main and side channels. Pre outcalibrate scan indicator of frequency, determine the incidence of side channels, levels of susceptibility, which do not match the specified level.

Thus, the proposed technical solution in comparison with the prototype allows to exclude long-term overload input circuits studied radio and extend the capabilities of the device by determining the frequency of side receiving channels, the levels of sensitivity which exceeds the preset level.

Device for measuring two-signal characteristics frequency selectivity of the radio to block and cross distortion, containing connected in series generator low frequency signals, the first controlled switch, the first amplitude modulator, the signal input of which is connected to the output of the signal generator operating frequency, and the block matching, the output of which is the entrance of the investigated radio, connected in series, the first unit of comparison, the first and second inputs of which are connected to the outputs of the detector is analyzed for the cue amplifier, the third controlled switch, a display unit, a second input connected to the second output of the third switch controlled oscillator, the second amplitude modulator, the modulating input of which is connected to the second output of the first controlled switch controlled attenuator, a control input connected to the output of the second controlled switch, and an electronic key, the control input and the output of which is connected to the output of the threshold element and a second input of block matching, respectively, the second block of comparison, the first and second inputs and the output of which is connected to the outputs of the detector studied radio and shaper of the reference signal and the second input of the second controlled switch, respectively, connected in series the differentiation block, the inlet of which is connected to the output of the display unit, and a counting trigger, the output of which is connected to control inputs of the first, second and third controllable switches, wherein the entered serially connected frequency detector, the input of which is the output of the intermediate frequency amplifier of the investigated radio, a gate, an inverter and an element OR second input of the and you the

 

Same patents:

The invention relates to radio engineering and can be used in wireless systems for remote control of technical parameters of radio stations

The invention relates to the field of radio, namely transmitting technique

The invention relates to the field of radio and may find application in devices analysis jamming environment for systems of protection against interference

The invention relates to a method of forming a measure SQ quality vector signal signal packet received by the receiver, for systems in the mobile digital radio

FIELD: radio communications.

SUBSTANCE: pulse noise is detected upon conversion of signal received into intermediate frequency, noise active time is determined, information signal is disconnected from amplifier incorporated in superheterodyne receiver, noise-affected part of information signal is recovered by eliminating simulator signals during extrapolation, and superheterodyne receiver is checked for serviceability at intermediate frequency.

EFFECT: enhanced precision of superheterodyne receiver serviceability check.

1 cl, 1 dwg

FIELD: cellular code-division radio communication systems using variable-speed voice coders.

SUBSTANCE: proposed method for evaluating data transfer speed includes suggestion of m hypotheses on data transfer speed for each data frame received and generation of k data metrics for each of them. Relationship between truth estimate of each hypothesis and aggregate values of respective data quality metrics is specified for generating truth estimates of each hypothesis and value of this relationship is found for data quality metrics obtained for frame received. Data quality is checked and decision is shaped on adopted speed and quality of received-frame decoded data.

EFFECT: enhanced precision of evaluating data transfer speed in forward and backward communication channels and data frames received with errors.

14 cl, 1 dwg

FIELD: radio communications engineering.

SUBSTANCE: proposed device has information signal source, threshold unit, pulse shaper, AND gate, differentiating unit, radio station transmitter and receiver.

EFFECT: enhanced checkup precision.

1 cl, 2 dwg

FIELD: automated control and diagnostics systems.

SUBSTANCE: first variant of complex includes control computer, mating block, commutator, local data exchange main, tests forming block, logical analyzer, signature analyzer, synchronization block, digital oscillographs block, special form signals programmed generators block, programmed power-sources block. Second variant of complex additionally includes block for forming high-frequency test signals and block for measuring high-frequency signals.

EFFECT: broader functional capabilities, higher efficiency, higher reliability.

2 cl, 2 dwg

FIELD: communications.

SUBSTANCE: communication system has decoder and testing system for sending test data to decoder. Test data include signaling data field, sent via traffic channel, and speech signal parameters, encoded via channel encoding, are formed in form of frames by testing device and sent to decoder for decoding. Decoder extracts at lest a portion of signaling data field, sent along traffic channel, from decoded test data and sends at least a portion of signaling data, sent via traffic channel, back to testing device. Efficiency of decoding is measured by comparison of sent field of signaling data, sent along traffic channel, and signaling data field, sent along traffic channel, received in testing device.

EFFECT: higher quality, higher efficiency.

3 cl, 6 dwg

FIELD: communications engineering.

SUBSTANCE: method includes configuring a receiver with possible waiting for receipt of communication channel at full data transfer speed, and signal from transmitter is sent to receiver. Signal is sent via communication channel with data transfer speed, different from full speed of data transfer, and at level of power for receipt at full data transfer speed. As a result receiver can not receiver communication channel at full data transfer speed. In receiver relation of received signal to noise is determined. Value of quality coefficient bit is determined ion basis of certain relation of signal to noise. Determined value of quality coefficient bit is sent to transmitter.

EFFECT: higher efficiency.

3 cl, 3 dwg, 7 tbl

FIELD: measuring equipment.

SUBSTANCE: device additionally features microcontrollers, one of which generates gating pulses, guided into controlled fiber-optic line before test pseudo-random series, and second one, while receiving gating pulses, produces synchronization signals.

EFFECT: simplified construction, higher efficiency, broader functional capabilities.

5 dwg

FIELD: radio engineering.

SUBSTANCE: mobile station supports counter of serial bad frames, C1, and counter of serial good frames, C2. at the beginning of call C1 and C2 are set to zero value. For each received frame mobile station determines, whether the frame is good, bad or empty. If the frame is good, than C1 is dropped to zero value, and C2 is increased by one unit. If the frame is bad, than C1 is increased by one unit, and C2 is dropped to zero value. If received frame is empty, than C1 and C2 stay unchanged. When C1 reaches threshold value, T1, mobile station blocks its transmitter. Accordingly, if C2 reaches threshold value, T2, then mobile station activates its transmitter again.

EFFECT: higher efficiency.

3 cl, 3 dwg

FIELD: mobile telecommunication systems.

SUBSTANCE: system has decoder and testing device, for sending test data to decoder. Test data, containing signaling data in format of signaling frames are generated, and test data are shown in two serial frames and sent from testing device to decoder for decoding. Signaling data are decoded from received two frames of test data and sent back to testing device being encoded as one frame. Working parameters of decoding are determined by comparing sent data of signaling and received data of signaling in testing device.

EFFECT: higher efficiency.

3 cl, 6 dwg, 1 tbl

FIELD: radio engineering.

SUBSTANCE: method includes determining required values of energy parameters for each client station, predicting value of parameters, distributing temporal-frequency resource between client stations.

EFFECT: higher efficiency of use of temporal-frequency resource, decreased energy consumption during transmission of data.

9 cl, 3 dwg

Up!