SU1381404A1 - Digital method of measuring frequency deviation of a frequency-modulated signal with harmonic modulation - Google Patents
Digital method of measuring frequency deviation of a frequency-modulated signal with harmonic modulation Download PDFInfo
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- SU1381404A1 SU1381404A1 SU833610724A SU3610724A SU1381404A1 SU 1381404 A1 SU1381404 A1 SU 1381404A1 SU 833610724 A SU833610724 A SU 833610724A SU 3610724 A SU3610724 A SU 3610724A SU 1381404 A1 SU1381404 A1 SU 1381404A1
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Abstract
Изобретение относитс к радиоизмерительной технике и служит дл повышени точности определени девиации частоты. Согласно предлагаемому способу измер ют частоту модулирующего сигнала и величину частоты несущего сигнала. Затем формируют два интервала времени Т «ачс И Тдлин между наход щимис на временной оси в окрестности точек перехода девиации фазы ЧМ-колебани через нуль и максимум и Ш1нимум соответственно, и измер ют интервал времени. После это- но подсчитывают koличecтвo периодов ЧМ-сигнала. Величину девиации частоты определ ют по соотношени м, приведенным в тексте описани . 1 ил. юThe invention relates to a radio measuring technique and serves to increase the accuracy of determining the frequency deviation. According to the proposed method, the frequency of the modulating signal and the magnitude of the frequency of the carrier signal are measured. Then, two time intervals T а AChs and Tdlins are formed between being on the time axis in the vicinity of the transition points of the phase deviation of the FM oscillation through zero and maximum and 11 minimum, respectively, and the time interval is measured. After this, the number of periods of the FM signal is calculated. The magnitude of the frequency deviation is determined by the ratios given in the description text. 1 il. Yu
Description
Изобретение относитс к радиоиз- мерительной технике и предназначено дл измерени девиации частоты.The invention relates to a radio measuring technique and is intended to measure frequency deviation.
Целью изобретени вл етс повышение точности определени девиации частоты.The aim of the invention is to improve the accuracy of determining the frequency deviation.
На фиг. а представлен график модулирующего сигнала; на фиг. 16 - график полной фазы ЧМ сигнала; на фиг. 1в - график ЧМ-колебани .FIG. a graph of the modulating signal is presented; in fig. 16 is a graph of the total phase of the FM signal; in fig. 1c is a graph of the FM oscillation.
Предлагаемый способ характеризуетс следующими операци ми: измер ют частоту модулирую1це го сигнала; измер ют величину частоты несущего сигнала; формируют два интервала времени , и Тд,,„ между положительными нул ми ЧМ-сигнала, наход щимис на временной оси в окрестности точек перехода девиации фазы ЧМ- колебани через нуль и максимум и минимум соответственно, измер ют интервалы времени; подсчитывают количество периодов ЧМ-сигнала п. , п д,,ц за эти интервалы; вычисл ют величину девиации фазы ЧМ-колебани мокс J МИ врем по формулам ,с,кс 21Г() 2 ;г( - ); определ ют величину пиковой девиации частоты ЧМ-сигнала по формулеThe proposed method is characterized by the following operations: measure the frequency of the modulated signal; the frequency of the carrier signal is measured; two time intervals are formed, and TD, „between the positive zeroes of the FM signal located on the time axis in the vicinity of the transition points of the phase deviation of the FM oscillation through zero and maximum and minimum, respectively, measure the time intervals; calculate the number of periods of the FM signal p., p d ,, .. for these intervals; calculate the value of the phase deviation of the FM oscillation Mox J MI time using the formulas, sec, cc 21g () 2; g (-); determine the magnitude of the peak frequency deviation of the FM signal by the formula
f К sin(2irFf«a c- 0o) -sinep f To sin (2irFf "a c- 0o) -sinep
где QO 2 iTFTo(T(j - интервал времени ме;кду максимумом модулирующего сиг- напа и ближайшим к нему нулем ЧМ- сигнала) - отклонение фазы модулирующего сигнала от (fr/2+2k H ) на начало измерени - определ етс через известные величины по формулеwhere QO 2 iTFTo (T (j is the time interval I; by the maximum of the modulating signal and the closest zero of the FM signal to it) is the deviation of the phase of the modulating signal from (fr / 2 + 2k H) at the beginning of the measurement — formula values
г г Г- l- ij i22ilFTMu«J l ii j 2ii /sin2irFT i.,,;H2g g - l- ij i22ilFTMu "J l ii j 2ii / sin2irFT i. ,,; H2
arc Lg /„„,, тс-тгт 1 л/лf - „ о-т-тг-г ТТarc Lg / „„ ,, ts-tgt 1 l / lf - „o-t-tg-g TT
йфyf
максMax
(,,-1)-й(, (cos2uFT,, -1)(,, - 1) th (, (cos2uFT ,, -1)
По сравнению с базовым, предложенный способ позвол ет расширить диапазон модулирующих частот вниз на всю ось частот, а также диапазон индексов модул ции от значений /3, стрем щихс к oi., до значений, ограниченных выражениемCompared to the baseline, the proposed method allows to extend the range of modulating frequencies down to the whole frequency axis, as well as the range of modulation indices from values of / 3, tending to oi., To values limited by the expression
5„. ЮЛ,,,. five". YuL ,,,.
Врем измерени уменьшаетс до периодов модулирующей функции.The measurement time is reduced to periods of the modulating function.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU833610724A SU1381404A1 (en) | 1983-06-24 | 1983-06-24 | Digital method of measuring frequency deviation of a frequency-modulated signal with harmonic modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU833610724A SU1381404A1 (en) | 1983-06-24 | 1983-06-24 | Digital method of measuring frequency deviation of a frequency-modulated signal with harmonic modulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU1381404A1 true SU1381404A1 (en) | 1988-03-15 |
Family
ID=21070349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU833610724A SU1381404A1 (en) | 1983-06-24 | 1983-06-24 | Digital method of measuring frequency deviation of a frequency-modulated signal with harmonic modulation |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU1381404A1 (en) |
-
1983
- 1983-06-24 SU SU833610724A patent/SU1381404A1/en active
Non-Patent Citations (1)
| Title |
|---|
| Авторское свидетельство СССР № 580521, кл. G 01 R 23/10, 1970. Приборы и техника эксперимента, 1982, № 1, с. 140. * |
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