SU1259823A1 - Receiver device of single-pulse radar - Google Patents

Description

"

IsoSorttle belongs to radio engineering and can be used in receiving devices of man-impulse tracking radar stations.

The purpose of the invention is to improve noise immunity.

Fig. 1 shows a monopulse radar structural electrical receiver; in fig. 2 is a converter circuit, an example of execution.

The receiver of a radio pulse radar contains a ring bridge | 1, the first channel 2, the second channel 3j each of which contains a high-frequency amplifier 4, a mixer 5, an intermediate-frequency amplifier 6, and an envelope detector 7, an amplifier 8, a comparison unit 9 , block 10 amplitude match, selector 11 short pulses, selector 12 radins of the pulses, first block 13 matches, second block 14 coincident ™, element Ш1И-НЕ 15, 16 pulses of pulses, counter 17, converter 18, analog digital converter (D / A) 19. Converter 19. (Fig. 2) contains the counter 20, szppmator 21 and the register 22.

The receiving device of the pulse - radar (Fig. 1) operates in a manner 0 and 1.

A ring bridge 1 is installed at the input of a monopulse radar receiver, on which simultaneous addition and subtraction of signals received by monopulse phase direction finder antennas takes place. From the output of the ring bridge 1, the signals arrive at the inputs of the first and second channels 2 and 3, where they are amplified, converted in frequency to the detectors. From the outputs of the detec- tion 7 of the first and second channels 2 and 3, the signals are fed to the inputs of the unit 10 as well as reasonable comparison. If the inputs of block 10 of amplitude are comparable to two signals of the same amplitude, then a signal appears at its output, otherwise there is no signal. If the amplitude of the signal from the output of the first channel 2 is greater than the threshold,

Pulse signals generated in amplitude pass the short pulse selector 11 and the first block 13 matches, are fed to the converter 18. In the case of the prohibition of equal time intervals, the information from the converter 18 in the form of the difference of the number of pulses entering the converter input and the support goes to D / A converter 19. Then the digital code is converted into a constant voltage by means of a D / A converter 19. The level of the receiver’s own noise levels, i.e. a feedback loop is implemented. In the case of the presence of a ban (

40 signal at the output of the element IPI-NOT 15), the converter 18 does not receive input signals, and the counting time of the converter 18 is automatically increased. It is observed for the same time interval 45 HHj during which an external disturbance acts, because no signals from the generator of 16 clock pulses are received at the input of the converter. In this way, the constancy of

JQ time counting (integration) signal35

received by a monopulse radar receiver.

The working signals of the receivers in the first and second channels have a difference

In Comparison Unit 9, the signals form 5 phases of about 2 and are less short in amplitude and fall on the input, the selector pulses 11 short pulses n the selector 12 longitudinal pulses. WITH

Therefore, if the interfering signals of arbitrary duration

ten

IS

20

259823I

the output of the short pulse selector 11, the signals arrive at the input of the first block 13 of coincidence, to the second input (prohibiting) of which signals come from the output of the OR-NB element. . 15. In the absence of a prohibition, signals are fed to the converter 18, which is used to count the number of pulses in a time equal to the interval between pulses from the counter 17. Signals from the generator 17 receive signals from the generator 16 clock pulses passed through the second block 14 matches, to the second input of which (prohibiting) signals come from the output of the element OR NOT 15. Signals from the output of converter 18 according to the pickup signal received from counter 17 are fed to the input of the DAC 19. The output voltage from the DAC 19 goes to control input of the amplifier 6 intermediate frequency of the first channel.

Pulse signals generated in amplitude pass the short pulse selector 11 and the first block 13 matches, are fed to the converter 18. In the case of the prohibition of equal time intervals, the information from the converter 18 in the form of the difference of the number of pulses entering the converter input and the support goes to D / A converter 19. Then the digital code is converted into a constant voltage by means of a D / A converter 19. The level of the receiver’s own noise levels, i.e. a feedback loop is implemented. In the case of the presence of a ban (

40 signal at the output of the element IPI-NOT 15), the converter 18 does not receive input signals, and the counting time of the converter 18 is automatically increased. It is observed for the same time interval 45 HHj during which an external disturbance acts, because no signals from the generator of 16 clock pulses are received at the input of the converter. In this way, the constancy of

JQ time counting (integration) signal 25

thirty

35

received by a monopulse radar receiver.

phases of about / 2 and less than the specified duration,

Therefore, if the interfering signals of arbitrary duration

arrive on. the input of the monopulse radar receiver, the time of the external signal will be controlled by the regulating voltage received before the moment of interference. This is ensured by the fact that the prohibition signal is generated from the output of the HJBi-HE 15 element by using signals from the outputs of the selector 12 long pulses and the amplitude comparison block 10, the input of which receives signals from the first and second channels 2 and 3. If the phase difference between Since the signals received using the main and differential patterns are about G / 2, then at the output of the first and second channels the amplitudes of the signals will be approximately the same. In the event that signals from several sources appear at the receiver input at the same time, selection by phase difference becomes

Fi.2

Compiled by V.Rodzivilov Editor A.Kuprov Kova Tehred E.Chkmar Corrector V. But ha

Order 1895 Circulation 380 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

598234

inefficient, but at the same time the duration of the received signal is expanded and the selector 11 of short signals will not allow them to exit. 5 Converter 18 (FIG. 2) operates as follows. The purpose of the converter 18 is to introduce the digital code for the difference in the number of pulses arriving at its input and for some given 10 given number (support),.

In counter 20, a support code is recorded. Counter 20 is operating in subtraction mode. This ensures that on the counter of counter 20, the code of the difference between the incoming number and the support. Next, through the adder 21, this number is fed to the input of the register 22, the removal signal, which is served by the signal

The 20 outputs of the counter 17, is applied to the second input of the register 22. At the same time, the support code is set at the counter 20, Opfz

FIG.

Claims (1)

A RECEIVER OF A MONOPULSE RADAR, containing a ring bridge, the first and second outputs of which are connected to the inputs of the first and second channels, each of which consists of a series-connected high-frequency amplifier, a mixer, an intermediate frequency amplifier and an envelope detector, a local oscillator, the first and second outputs of which are connected with the second inputs * · of the mixers of the first and second channels, the comparison unit and the first coincidence unit, and the outputs of the amplifiers of the intermediate frequency of the first and second channels are These are the outputs of the device, which is unique in that, in order to increase the noise immunity, an amplitude comparison unit, a short pulse selector, a long pulse selector, a second coincidence unit, an OR-HE element, a converter, a counter, a digital-to-analog converter, and a clock generator are introduced pulses, and the output of the envelope detector of the first channel is connected to the first inputs of the amplitude comparison unit and the comparison unit, the output of which through the selector of short pulses is connected to the first input of the first coincidence unit and four es selector long pulses, to the first input element; OR NOT, - the output of the clock is connected to the first input. the second coincidence block, the output of the OR-HE element with the second inputs of the first and second coincidence blocks, the output of the first coincidence block with the first input of the converter, the output of the second coincidence block through the counter is connected to the second input of the converter, the output of which is connected to the control input via a digital-to-analog converter amplifier 'intermediate frequency of the first .channel, the output of the envelope detector of the second channel is connected to the second input of the amplitude comparison unit, the output of which is connected to the second input of the IL element -HE. > 1 1259823