SU517984A1

SU517984A1 - Device for forming a sequence of coherent radio pulses

Info

Publication number: SU517984A1
Application number: SU2047258A
Authority: SU
Inventors: Анатолий Павлович Дятлов; Юрий Федорович Евдокимов; Эдуард Михайлович Колесников; Владимир Евгеньевич Сметанко
Original assignee: Таганрогский радиотехнический институт им.В.Д.Калмыкова
Priority date: 1974-07-09
Filing date: 1974-07-09
Publication date: 1976-06-15

Description

Изобретение относитс к радиотехнике и может использоватьс в радиолокации, системах передачи информации и радиоизмерительной технике.The invention relates to radio engineering and can be used in radar, information transmission systems and radio measuring equipment.

Известно устройство дл формировани последовательности когерентных радиоимпульсов , содержащее последовательно соединенные генератор опорной частоты, коммутатор, фазовый детектор и фильтр, при этом выход генератора модулирующих импульсов соединен с управл ющим входом коммутатора, к выходу которого подключен фазовращатель.A device for forming a sequence of coherent radio pulses is known, comprising a series-connected reference frequency generator, a switch, a phase detector and a filter, and the output of the modulating pulse generator is connected to the control input of the switch to the output of which the phase shifter is connected.

Однако известное устройство имеет ограниченный диапазон перестройки несущей частоты и начальной фазы радиоимпульсов.However, the known device has a limited range of tuning the carrier frequency and the initial phase of the radio pulses.

С целью расширени диапазона перестройки несущей частоты и начальной фазы радиоимпульсов в устройство введены перестраиваема лини задержки, включенна между фазовращателем и вторым входом фазового детектора, и блок управлени , вход которого подключен к выходу генератора модулирующих импульсов, а каждый из двух выходов - к управл ющим входам фазовращател и перестраиваемой линии задержки.In order to expand the range of tuning the carrier frequency and the initial phase of the radio pulses, a tunable delay line is inserted in the device, connected between the phase shifter and the second input of the phase detector, and a control unit whose input is connected to the output of the generator of modulating pulses and each of the two outputs to the control inputs phase shifter and tunable delay line.

На чертеже приведена структурна схема устройства.The drawing shows a block diagram of the device.

Устройство дл формировани последовательности когерентных радиоимпульсов соержит последовательно соединенные генератор 1 опорной частоты, коммутатор 2, фазовый детектор 3 и фильтр 4, а также генератор 5 модулирующих импульсов, соединенный с, управл ющим входом коммутатора 2, к выходу которого подключен вход фазовращател 6, перестраиваема лини задержки 7, включенна между фазовращателем 6 и вторым входом фазового детектора 3, и блокA device for forming a sequence of coherent radio pulses will contain a series-connected reference frequency generator 1, switch 2, phase detector 3 and filter 4, as well as a modulating pulse generator 5 connected to the control input of the switch 2, to the output of which the phase shifter 6 is connected, a tunable line delays 7, connected between the phase shifter 6 and the second input of the phase detector 3, and the unit

8 управлени , вход которого подключен к выходу генератора 5 модулирзющих импульсов, а каждый из двух выходов - к управл ющим входам фазовращател б и перестраиваемой линии задержки 7.8 of the control, the input of which is connected to the output of the generator 5 of the modulating pulses, and each of the two outputs to the control inputs of the phase shifter b and the tunable delay line 7.

Устройство работает следующим образом. На входах фазового детектора 3 имеютс два сигналаThe device works as follows. At the inputs of the phase detector 3 there are two signals

и, (f) - И (f) cos and, (f) - and (f) cos

U (f) - U, (t) cos (o), t -h - (0 + }U (f) - U, (t) cos (o), t -h - (0 +}

при 0 г г,at 0 g g

где T:(t)it - текущее изменение задержки перестраиваемой линии задержки 7;where T: (t) it is the current change in delay of the tunable delay line 7;

Дт - задержка, вносима фазовращателем 6;Dt - the delay introduced by the phase shifter 6;

Claims

T is the duration of the modulating pulse, coinciding with. the period of reorganization of the LINE of a delay 7; After multiplying in the phase detector 3 and filtering at the input of the filter 4, a radio pulse "x (O - U (t) (i + Ar)" is obtained at about 4 O. whose parameters can be varied over a wide range (carrier frequency by adjusting the tuning rate, and initial phase by setting the corresponding delay value of the phase shifter 6). When forming a sequence of coherent radio pulses T const, Dt ;; const, the modulating pulse generator 5 generates a sequence of video pulses with a repetition period Tn, while the output device receives WL (O out (02j (t + At - / r7n) with (Ta + T), the tuning delay rate changes when switching to another carrier frequency in min. To reduce transient processes when the sequence of radio frequency pulses is affected by the radio path, the radio pulse phases must be minimized, which is performed under the condition cucAT 2iiA, where K is an integer. The device is used to form frequency-and phase-manipulated radio pulses. In addition, when using a random signal for controlling the phase shifter O, a sequence of radio pulses with a random initial phase with a given distribution law is obtained; when forming frequency-controlled manipulating radio pulses, At const the modulating generator generates a sequence of video pulses with a duty cycle 01; 1, and T const is constant for the duration of one pulse and varies from pulse to pulse. The output voltage of the device at the same time has the form of an output (O out (O 2j ° S He (a + at pT (n + 1) T. To reduce transients when the frequency-manipulated radio pulses affect the radio path, it is necessary for phase switching was minimal, which is performed under the condition o) s (tmax, g + Dt) 2 / C), where / C is an integer. When forming t-const phase-shifted radio pulses, the modulating pulse generator produces a sequence of video pulses with (, At constant for the duration of a single pulse and pulse to pulse. In this case, the output voltage of the device has the form t / o (O (O 2i COS (t +) 1 at LG), 4 ("+ 1) 7. The delay tuning rate t changes as it passes another gusher Frequency through tG The overlap factor of the frequency range of the generated signals K. n depends on the magnitude of gmax / tmish where T max and T min is the maximum and minimum values of the delay retuning rate., Taking into account the possibility of occurrence of combinational components at the output of phase detector 3 using one filter 4 exceeds oct you. The device generates a sequence of coherent radio pulses at a fixed reference frequency of the signal in a wide frequency range from audio frequencies to (L4 with pulses from nanoseconds to ten seconds. Formula for generating a sequence of coherent radio pulses containing a series-connected reference frequency generator, switch, phase detector and a filter, while the output of the modulating pulse generator is connected to the control input of the switch, to the output of the cat A phase shifter is connected, characterized in that, in order to expand the carrier frequency tuning range and the initial phase of the radio pulses, a tunable delay line is inserted into the device, connected between the phase shifter and the second input of the phase detector, and the control unit, the input of which is connected to the output of the modulating pulse generator, and each of the two outputs is to the control inputs of the phase shifter and the tunable delay line.