SU656401A1 - Device for measuring parameters of radio impulses - Google Patents

Description

The invention relates to radio engineering and can be used, for example, in vertical, off-platform and on-chip-on ionospheric stations, in multi-frequency radar and in some HF communication systems for the automatic detection and measurement of parameters of the radio pulses under study. A device for measuring the parameters of radio pulses is known, comprising an antenna connected via an adder to a radio receiver, which is connected to the main input of the amplifier-limiter, the output of which is connected to the first input of the first element I, the generator of reference signals, the output of which is connected to the second input of the adder samples, the first output of which is connected. to the second input of the first element I and to the first inputs of the second and third elements I, the outputs of the first and second elements I are connected to the corresponding named for the inputs of the reversing counter, and vg) the input of the third element I is connected to the first input of the counter of the number of readings, the information output of the reversible counter is connected to one of the inputs of the indicator l. However, the accuracy of measuring radio pulses with an unknown temporal position in such a device is not high. The purpose of the invention is to improve the measurement accuracy of radio pulses with an unknown temporal position. In order to reach the device, the rapioimpuce parameter measuring device contains an antenna connected via an adder to a radio receiver, the output of which is connected to the main amplifier amplifier input, the output of which is connected to the first input of the first element And, a generator of reference signals, the output of which is connected to the second input of the adder, a counter the number of samples, the first output of which is connected to the second input of the first element And to the first inputs of the second and third elements And, the outputs of the first and second elements And connected to with The current inputs of the reversible counter, and the output of the third element I are connected to the first input of the counter, and the information counter is connected to one of the indicator inputs, an analog integrator, a series connected time selector and a trigger, a programmer, a chronic lamp, an accumulator are entered. signals, a decision unit, a delay line, an OR element, an additional AND element and a shift register, while the analog integrator is connected between the main and control inputs of the limiting amplifier, the output of which is connected to the time selector input, the trigger output is connected to the second input of the second element AND, the output of the delay line is connected to the third input of the first e-mail and the second output of the count counter through the programmer is connected to the control inputs of the reversible counter, the signal accumulation unit is on between the information output and the input of the reversible counter, and the output of the reversing counter through the serially connected shift register, the additional AND element and the OR element, to the second inputs of which The first and second outputs of the chroniser are connected respectively, connected respectively to the second and third inputs of the third and second elements And to the input of the delay line, the corresponding synchronizing outputs of the chroniator are connected to the corresponding input of the signal heating unit and to the control inputs the selector, the reset inputs of the analog trigger integrator, the count number counter, the reversing counter, the indicator and the signal accumulation unit are connected to the third output xp The analyzer, the fourth output of which is connected to the third input of the shift register, the information decision input unit is connected to the information output of the signal accumulation box, and the control inputs to the output of the signal accumulation unit and the third output of the shift register. The drawing shows a structural electrical circuit of the proposed device. The device for measuring the parameters of radio pulses contains an antenna 1, co-amped via an adder 2 with a radio receiver 3, the output of which is connected to the main input of the amplifier-limiter 4, the output of which is connected to the first input of the first element 5, the generator 6 of reference signals, the output of which is connected to the second the input of the adder 2, the counter 7 of the number of samples, the first output of which is connected to the second input of the first element And 5 and to the first inputs of the second and third elements And 8.9, the outputs of the first and second elements And 5, 8 are connected to respectively the reversible counter inputs 10, and the output of the third element 9 I is connected to the first input of the counter 7, the number of counts, the information output of the reversible counter 10 is connected to one of the indicator inputs C, an analog integrator 12 connected in series by the time selector 13 and the trigger 14, the programmer 15, chronizator 16, signal accumulation block 17, decision block 18, delay line, OR 2 O element, additional element 21 And to the shift register 22. An analog integrator 12 is connected between the main and control inputs of the amplifier - limiter 4, the output of which is connected to the time selector 13, the output of the trigger 14 is connected to the second input of the second element And 8, the output of the delay line 19 is connected to the third input of the first element And 5 , the second output of the counter 7 of the number of counts through the programmer 15 is connected to the control inputs of the reversible counter 10. The signal accumulation unit 17 is connected between the information, the output and the reversing counter 10, and the output of the reversing counter Chika 10 through serially connected shift register 22, additional element 21 and element OR 2O, to the second inputs of which the first and second outputs of the chroniser 16 are connected, respectively, is connected respectively to the second and third inputs of the third and second elements 9, 8 to the inputs of line 19 delays, the corresponding synchronization outputs of the chroniser 16 are connected to the corresponding input of the signal accumulation unit 17 and to the control inputs of the generator 6 of the reference signals and the time selector 13. Reset inputs of the analogue integral - rator 12, trigger 14, counter 7, the number of counts of the reversible counter 1O, indicator 11, signal accumulation unit 17 is connected to the first output of chronizer 16, the third output of which is connected to the third input of shift register 22, information input of decision unit 18 is connected to the information output of the signal accumulation unit 17, and the control inputs to the output of the signal accumulation unit 17 and to the third output of the chroniser 16, whose input is connected to the output of the shift register 22, and the control accumulator 23 enters the signal accumulation unit The mutator 24, the RAM block 25 and the output block 26. The device operates as follows. Radio pulses with noise received by antenna 1 are reflected from the ionosphere and are transmitted through adder 2 to radio receiver 3. Adder 2 before. assigned for undistorted transmission of the signals under study with interference and for summing additive noise and interference with a radio pulse of reference amplitude from the generator 6 reference signals. In radio receiver 3, these signals are preselected and amplified. From the output of the radio receiver 3, a high-frequency voltage containing the etalosh 1st and the signals being investigated with interference, the main input of the amplifier limiting 4 and the analogue integrator 12. The output of the radio receiver 3 is equipped with an RC transition circuit for filtering the constant component. Analog integrator 12 produces a voltage proportional to the average value of the intensity of additive interference associated with the signals under study. The voltage proportional to the noise level from the output of the analog integrator 12 is applied to the control input of the amplifier limiter 4. This output voltage of the integrator 12 is the level of the quantization threshold. The operation of the limiting amplifier 4 is enclosed in the binary quantization of the signal coming from the output of the radio receiver 3. If the input process is greater than the quantization threshold level, then the output of the limiting amplifier 4 produces a normalized amplitude signal +1 over the entire interval of excess, if it is lower than the quantization level, then at the peak of its potential is zero. Thus, amplifier 1: -O1p, chitol 4 converts the input signal into a burst of rectangular pulses at intervals exceeding the quantization level. The quantization threshold (limit) varies in accordance with the change in the interference intensity and automatically maintains a constant number of noise emissions, exceeding this quantization threshold, over a certain time interval. Such adaptive quantization threshold adjustment contributes to improved detection performance and increases noise immunity to spurious reflections. Limited oscillations from the output of the limiter amplifier 4 are applied to the serially connected time selector 13 and trigger 14, as well as to the first input of the first element AND 5. The time selector 13 is a control key for selecting a time interval that does not contain the signals under study. The selection of the jamming section is made by submitting a gate selector 13 from the chroniser 16 to the control input. If the quantized mix is positive from the noise at the time the pulse is fed to the time selector 13, the trigger 14 remembers this excess and at its output a high potential. The inputs of the delay line 19 of the second and third elements And 8.9 through the element 2O OR short gating pulses from the chroniser 16 are fed. The gating pulse detained by the delay line 19 arrives at the third input of the element 5. With the help of these delayed gates, the working distance is sampled and also, if at the moment of gating, for example, if pulses, the banned mixture arriving at the first input of the element AND 5 from the signal under study and interference, is positive, then at the output of the element 5 and there is a pulse that The one will be written into the reversible counter 1 with the value +1. If there is a negative value of the mixture, the signal at the output of the element And 5 is zero and the information in the reversible counter XP does not change. The duration of the gating pulses from the chronizer 16 to the time selector 13 and to the inputs of the delay line 19 and 7) and throttle 1X) a.ioMiMiTOB And 8, 9, juiBHp.i ioriotsu repeat. With the arrival of the Chgkpchlch. + 1 strobe pulse of the I1G pulse |} After subtracting the difference of information in the form of double parallel codes, the code goes to the reversing counter 1O on the indicator 11 and block 17 on accumulating signal / gov. For N periods of aeonation in a reverse counter 1O nyi-em, the summation by the implementation can be on; rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr Abb al-I1 The number of instrumentation of the quantization level in the strobe in the presence of the signal under study and interference; hi j is the number of translations of the quantization level in the strobe in the presence of interference only. In indicator 11, the njxmocca accumulation and extraction of the signal is carried out and the information on the number of accumulated pulses in the quantum of distance is read. The signal accumulation unit 17 is a x-signal signal alternation period accumulator, in which the information on the number of signals is stored, the information is read and written for each distance quantum. For the time interval corresponding to one distance quantum, two calls are made to accumulation block 17; Signals. G1) and the first access to the signal accumulation block 17 from the selected count) P; a, corresponding to the distance quantum, is made to count the number of e-codes (binary-o-number) of the newscopic pulses from the sounding periods, and c. With a delay of 1 µs, the recording is made of the IT code for the following: Fourth slot 10. Quantized pulses from the first and BTOX) Elements I 5 and 8 enters 1U1 in the reporter 10 for the interval BpeMejui, determined by the gate action and - the pul. ) corresponding to the beginning of the selected distribution quantum. ta P reversible counter 10 HJXJ is the summation of the number of accumulated signals for J-1 sounding periods with differential (prevalence in the strobe with the signal under test and interference, minus excess in the strobe with only interference) with the j -he signal of the sounding period. The second call to the signal accumulation unit 17 is overwritten into it (into the same counter of the selected quantum of distance) from the reversible counter 10 of the total number of signals for j periods of sounding in the form of a double parallel code. Then, with a delay of 0.5 ISS, the switch 24 accumulates & h switches to the next distance quantum and the procedure for summing the difference signals repeats as described. By a command from the chroniser 16, the reset in the reversible counter 10, the counter 7, the number of counts, the indicator 11, the shift register 22 is set in the initial pollace block 17.:; accumulation of shifts, analog integrator 12, trigger 14 and the first, second and third elements AND 5, 8, 9 open. The process of selecting and measuring the signal under study starts from the moment when the command is sent to the control unit 23 from the chronizer 16 and through the element 2O OR gating pulses to the inputs of the delay line 19 of BTOpoix) and the third element are And 8, 9. The process of detecting the investigated signals from interference involves comparing the number of accumulated signals for N., Ng and N3 sounding periods with the corresponding the detection threshold K from H, K and Mg and Co from No, coming from the programmer 15. The programmer 15 is controlled by count 7 of the number of samples, which opens its corresponding control outputs only on Nt, Ng and No, the sample implementation . If the number of accumulated signals in N periods of calling (in one of the distance quanta) exceeds K, the first control output is opened, and a pulse is generated at the output of the reversing counter O, pulse Fia arrives at the shift register 22. Laglog-ichno 1-iisodiscise detection of the signals under study at other thresholds of loading K j ia

ig, K of q, it is only in these ways that the second, third inputs of the reversible counter and O are opened, respectively. The detection threshold for Kf from S is preliminarily for extracting signals from the signal-type signal ratio at the 1H1-X) output of path 2 is greater than 1, the threshold is K 2 of 4 2 for selecting signals at from-Hour VNII signal-interference about 1 and K 5, from N to isolate signals at a signal-to-noise ratio of cubic 1.

The shift register 22 compensates for the ader / lock forwarding line with a delay time equal to the period of 1 P1. Such a delay in the shift register 22 is determined by the choice of the number 1) of the numbers in the register and the frequency of the clock pulses received from the chronizer 16, From the output of the shift register 22 produced by a pulse with a duration 20 proportional to the ratio of the test sipsala, (since a priori the duration of the pulse studied is known). This signal arrives at an additional element AND 21 and permits strobe pulses J passing through it to increase the repetition rate from the chronioator 16. From the register of the 22-shift, there is also a signal of the clock 16, which prohibits direct impulses from the element OR 20 Packs of gated proportional pulses of the additional element 21 AND, the passage through the element 20, are received35 at the inputs of the delay line 19 and the second

and the third elements And 8, 9. Tatsim zom, after the detection of the studied signals further them; isolation and izmenen e produced at the expense of the stat- Go uvesh.eshshsh in a pack of gates. The use of averaging function of a sufficiently large number of samples in a packet of gates allows one to obtain a high accuracy of reproduction of the shape and amplitude of the signals under study.

When in the counter 7 the number of samples recorded number. 1 (equal to the selected number of samples), elements AND 5.8.9 are closed and the gating process is terminated. Block 7 accumulation of signals peresodptts; to the reset mode, where the accumulated accumulator is counted - is available through the reversible counter: at 10 to the indicator 11,

The display 11 reproduces the shape of the selected signals. Block 18 make decisions using information about the

The value of the signal-to-noise ratio and the intrinsic interference (calculated using ethyl signal) is determined by the value of OMiunttudy. The information input (the number of accumulated pulses code) of the block 18 of the penie-ni is connected to the output of the block 17 of the accumulation of signals, and the inputs of the block 18 of the decision-making are connected to the outputs of the chroniatator 16 and the block 17 of the accumulator

laziness of signals (pulse of quantization end),

The device allows you to automatically detect and measure the parameters of several signals with an accuracy not lower than

Claims (1)

The inputs of the reversible counter, and the output of the third element I are connected to the first input of the counter of the number of counts, the informodion output-reversible counter is connected to one of the indicator inputs, characterized in that, in order to improve the accuracy of the radio pulses with an unknown time position, an analog integrator is entered , serially connected time selector and trigger, programmer, chronator, signal accumulation unit, decision block, delay line, OR element, additional AND and register shift, while the analog integrator is connected between the main and control inputs of amplifiers-grants, the output of which is connected to the time selector, the output of the trigger is connected to the second input of the second element And, the output of the delay line is connected to the third input of the first 1% in a wide range signal-to-noise ratio at the output of sources of snnga-, artifacts with arbitrary dynamic characteristics „Formula of the Invention A device for the paramotor of radio pulses, containing an antenna, connected via a radio the one whose output is connected to the main input of the amplifier-limiter, the output of which is connected to the first input of the first element And, the generator of reference signals, the output of which is connected to the second input of the adder, the count of samples, the first output of which is connected to the second input of the first element And to the first inputs of the second and third elements I. The outputs of the first and second elements I are connected to the corresponding element I, the second output of the counter of the number of readings through the programmer is connected to the control inputs of the reversing center A signal accumulator, a signal accumulation unit is connected between the information M11 output and the input of the reversible counter, and the output of the reversible counter through successively. the connected shift register, the additional element AND and the OR element, to the second inputs of which the first and second outputs of the chronizer are connected, respectively, are connected respectively to the second and third inputs of the third and second elements AND, and to the input of the aderzhki, the corresponding synchronized outputs of the chroniser connected to the corresponding input of the signal accumulation unit and to the control inputs of the generator of the reference signals and the time selector, the fault inputs of the knowledge-based integrator, trigger, count counter, eversivnogo counter, indicator signals and the storage unit are connected to the third output hronizatora whose fourth output soe-. It is connected to the third input of the shift register, the information input of the decision block is connected to the information1} ion output of the α-block, signal accumulation, and the control inputs are connected to the output of the signal accumulation block and to the third output of the chroniser, whose input is connected to the output of the shift register. Sources of information taken into consideration. During examination 1. A. Lutchenko, et al. Digital device for measuring parameters of signals at the output of radio devices (deposited manuscript 3-3513), 1972, East. RIR, 1973, 17-203.