SU1018043A1 - Digital radio pulse phase meter - Google Patents

Abstract

DIGITAL RADIO IMPULSE PHASOMETER containing serially connected transducer phase shift - time interval, time-pulse transducer and pulse counter, as well as overlapping pulse shaper connected by its inputs to the phase meter inputs or additional transducer outputs phase shift - time interval, and output to the start block, its output is connected to a time-pulse converter and a pulse counter, containing also series-connected additional frequency divider and bl approx. matches, in order to increase noise immunity, a memory block is inserted into the phase meter, the input and output of which are connected respectively to the output and the installation input of the pulse counter, and the control input to the output of the coincidence block, the output of the time-pulse converter S is often connected to the divider (Lt. through the coincidence unit, the second input; which is connected to the output of the overlap pulse generator, and the third to the output of the frequency divider.

Description

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00 The invention relates to a radio measuring technique and can be applied in the development of digital phase-measuring devices of radio direction finders. A digital phase meter is known that contains amplifiers, limiters, drivers, a generator of counting pulses, a frequency divider keys, in which the measurement of the phase difference is made over a constant time ij. A disadvantage of the known phase meter is the impossibility of measuring the phase difference between the radio pulse signals. The closest in technical terms to the proposed phase meter is a digital radio pulse phase meter with a constant measurement time, containing a phase shift converter - a time interval connected to a time pulse converter connected to a pulse counter, an override pulse generator connected to the start unit which is connected to a pulse counter and to a time-to-pulse converter 2. In the radar and radio navigation systems, there are noises in the pauses between the radio pulses. These impulse noises generate, at the output of the pulse shaper, overlapping spurious overlap pulses, which produce false starts of the phase meter. In this case, the measurement results will be false. The purpose of the invention is to increase the noise immunity of the phase meter. This is achieved by the fact that in a phase meter containing successively connected transducer a phase shift is a time interval, a time-pulse converter and a pulse counter, as well as an overlapping pulse shaper connected by its inputs to the phase meter inputs or an additional output of the phase shift converter — time interval,, and an output to the start-up unit, its output connected to a time-pulse converter and a pulse counter, also containing a series-connected additional frequency divider and a block with A memory unit is inputted, the input and output of which are connected respectively to the output and installation input of the pulse counter, and the control input to the output of the coincidence unit, while the additional time-pulse output converter is connected to the frequency divider through the coincidence unit, the second input which is connected to the output of the override pulse shaper, and the third - to the output of the frequency divider. . The drawing shows the structural diagram of the proposed phase meter. The phase meter contains a converter 1 connected in series. Phase shift - time interval, time pulse converter 2, pulse counter 3 and memory block 4, as well as pulse generator 5 connected to the phase meter or additional outputs of converter 1 an overlap connected to the start-up unit 6, the output of which is connected to the converter 2 and the counter 3, the output of the driver 5 is also connected to the first input of the noise-free averaging unit 7, o One of which is connected to block 4, and the second input with an additional output of converter 2. Block 7 contains a block of 8 matches, connected by an output to a frequency divider 9, the output of which is connected to the third input of block 8. The phase meter operates as follows. The radio pulse signals, the phase shift between which is measured, are fed to the input of the converter 1, the output of which is a sequence of rectangular pulses, the duration of which is proportional to the measured phase shift tp. These pulses arrive at the first input of the quantizing device of the converter 2, to the second input of which, at the beginning of each overlapping of the signals, with the time of the driving unit of the converter 2 receives a pack of M pulses. With a duration of this pack less overlap of signals, the output of converter 2 from each pack will pass only N (/ 36O pulses recorded in counter 3. After the pack of pulses ends, a short pulse arrives at the input of block 7 from the additional output of converter 2. If the duration of the packet is shorter than the duration blocking the signals, then this pulse passes through block 7 to the input of block 4 and writes to block 4 the readings of counter 3. By the beginning of the next blocking of signals by pulse from block 6, the results are recorded This is done in order to exclude the participation in the averaging process of measurement results caused by the false starts of the converter 2. The measurement results caused by false overlaps are recorded in the counter 3, but are not recorded in the memory. in the proposed phase meter it consists of K (K is set by a block of 7 measurements, carried out in the initial part of the radio impulses that is not affected by reflected waves. The averaging is carried out by the counter G and recorded in block 4 using block 7. After the K – rO measurement is performed, block 4 will write the number 1 (H (| / 360). phase shift. Before starting the measurement process, zero is recorded in block 4. Block 7 selects signal overlaps by duration and limits the number of measurements to be averaged. It does not pass a write pulse to output of block 8 if the duration of the measurement is pain

above the duration of the overlap of the signals. This is achieved by applying to the second input of the block 8 an overlap pulse from the output of the driver. Limiting the number of measurements of K to be averaged is carried out by the signal from divider 9 at the third input of block 8.

Introduction of the memory unit 4 and the new connections with the averaging unit 7 allows one to eliminate errors caused by impulse noise, the overlap duration of which is less than the measurement duration in a separate radio pulse.

Claims (1)

A DIGITAL RADIO-PULSE PHASOMETER containing a phase shift transducer - a time interval, a time-pulse transducer and a pulse counter, as well as an overlap pulse shaper connected by its inputs to the inputs of the phase meter or additional outputs of the transducer - a phase interval, and an output to the start block, its output connected to a time-pulse converter and a pulse counter, which also contains additional frequency divider and block coincidently connected In order to increase the noise immunity, a memory block is inserted into the phase meter, the input and output of which are connected respectively to the output and the setting input of the pulse counter, and the control input is connected to the output of the coincidence block, and the additional time The pulse converter is connected to the frequency divider through the coincidence block, the second input of which is connected to the output of the overlap pulse generator, and ζ the third to the output of the frequency divider.