RU2713624C1 - Monopulse radar system - Google Patents

Abstract

FIELD: radar ranging and radio navigation.

SUBSTANCE: invention relates to radar systems (RS) with pulse phase-modulated sounding signal used on mobile carriers, mainly on unmanned aerial vehicles (UAV), and intended for detection and tracking by mono-pulse method of signals from objects of destination (targets). In order to achieve the above technical result before the RS is switched on to the active mode with the powerful probing signal and the antenna beam is scanned for the possible positions of the destination objects, it is proposed to perform the this area scanning in passive stealth mode, providing only detection of radio signals by receiving channel in extended frequency range without radiation of own sounding signal, and when selecting an assignment object, not only the power of the reflected echo signal but also the fact of detecting extraneous radio signals from the same direction along the azimuth is taken into account. Essence of the invention is that the monopulse radar system comprises an exciter, a synchroniser, a code generator, an amplitude modulator, a ultrahigh frequency (UHF) transceiver unit, signal processing, capture and tracking unit (SPCT), target object detection and selection unit, prelaunch preparation unit, pre-launch preparation signal sensor, speed sensor, start cancellation indicator, passive radio channel (PRC) signal processing unit, priority correction unit, an antenna scanning control unit, a broadband radio pulse detector, an antenna drive control code switch, a subtractor unit, an AND-OR element and an OR element connected to each other in a certain manner.

EFFECT: higher efficiency of radar systems during installation on UAV.

1 cl, 6 dwg

Description

The invention relates to radar systems (radar) with a pulsed phase-manipulated sounding signal used on mobile carriers, mainly on unmanned aerial vehicles (UAVs), and designed to detect and track in a single-pulse way signals from targets (targets).

In monopulse radars designed to detect and track targets, the received high-frequency signals after the sum-difference conversion are fed to the mixers of the total and difference channels and then to the intermediate-frequency amplifiers, from the outputs of which the signals are fed to the amplitude detector in the total channel and to the phase detector in the differential channel. As a result of phase detection, an angular mismatch signal is generated, which is used for angular tracking [1, p. 22, fig. 1.9], [2, p. 20, fig. fifteen]. The signal of the total channel is fed to a temporary discriminator, in which a signal is generated for tracking along the range.

The disadvantage of these devices is the low efficiency associated with insufficient noise immunity with respect to active and passive interference. Active interference leads to the detection of false objects and the masking of true destination objects. Passive interference in the form of reflections from local objects also mask a useful signal due to the inability to realize high resolution in angles at long ranges with limited sizes of radars mounted on mobile carriers, which therefore have a wide antenna pattern. These factors reduce the likelihood of the correct selection of the destination and the corresponding efficiency of the devices.

A device [3] is known which uses complex phase-shift keyed signals (hereinafter referred to as FM) for operation and contains a series-connected code generator, a phase manipulator, a power amplifier, an antenna switch and an antenna, a series-differential converter, a high-frequency amplifier, a mixer, an intermediate frequency amplifier, as well as an exciter, a pulse modulator, an antenna drive, blocks of phase detectors of the total and difference signals with amplitude quantizers, digital agreed filters of a complex signal containing two quadratures, a module calculation unit, a coordinate detection and calculation unit, a range discriminator, a time domain code converter, a frequency discriminator, an angle discriminator, Doppler frequency generators, Doppler frequency filters, a tracking object capture unit, adders, subtracters , gates and registers.

Thanks to the use of phase-shifted signals and the simultaneous operation of three object tracking loops: the radar resolution has been significantly increased in range, in Doppler frequency and in angle.

The disadvantage of a radar when it is mounted on a UAV is its low efficiency due to the fact that when the carrier speed increases, in particular when installing a radar on an unmanned aerial vehicle, significant phase distortion of the reflected signals occurs, which, when the probe signal is long, causes compression difficulties in digital matched filters and reduce the likelihood of detecting and choosing the right target, which directly affects the effectiveness of the radar.

In addition, any malfunction in the radar can lead to the fact that the UAV does not reach the destination and will be lost. This requires an increased consumption of UAV samples and also reduces the effectiveness of the radar.

Known radar [4], which is closest in technical essence to the proposed device and adopted as a prototype of the proposed system.

To increase reliability, a prelaunch unit was introduced into the radar according to the prototype, which performs a comprehensive test of the equipment and ensures the start of the UAV only if it is operational.

The prototype radar contains a synchronizer, an exciter, a code generator, an amplitude modulator, a speed sensor, a start cancellation indicator, and also the following blocks:

- a microwave transceiver unit including an antenna, antenna drive, antenna angle sensor, sum-difference converter, antenna switch (circulator), high-frequency amplifier, phase manipulator, directional coupler, power amplifier and power amplifier power switch with corresponding connections ;

- a prelaunch preparation unit, including a reference angle sensor, a reference speed sensor, an initial range sensor, a range change generator, a start trigger, a trigger cancellation trigger, two control and standard signal switches, a single pulse generator, a controlled delay element, an angle code comparison unit, range counter, AND element, delay element, and inverter with corresponding connections;

- a signal processing, capturing and tracking unit for the target, including mixers with bandpass filters, intermediate frequency amplifiers, quadrature phase detectors, digital matched filters, Doppler compensators, and also three discriminators (in range, frequency, and angle) for the total and difference channels ) combiner of quadrature channels, pulse generators, delay elements, valve block, code converter - time interval with corresponding connections;

- a unit for detecting and selecting a target, including a range counter, Doppler frequency filters, Doppler frequency generators, code buses, final code decoders, a comparison unit, frequency register, counter, switch, and trigger.

Thanks to the radar control by the prelaunch unit before launch, its reliability during flight has been significantly increased.

The disadvantage of a radar is its low efficiency, due to the fact that the only criterion used is the power of the reflected signal, which when using modern technologies for constructing destination objects (for example, stealth) does not always correspond to the importance of the object itself, and can also be easily simulated using corner reflectors.

The technical result of the invention is to increase the effectiveness of the radar when installed on a UAV.

To achieve the claimed technical result, before turning the radar into active mode with the radiation of a powerful probe signal and scanning the antenna beam with the area of the possible position of the target objects, it is proposed to perform preliminary scanning of this area in the passive stealth mode, which only provides for the detection of radio signals by the receiving channel in an extended frequency range without radiation of its own sounding signal, and when choosing a destination, to take into account not only powerfully them to be reflected echo signal, but also the fact of detection of foreign radio signals from the same direction in azimuth.

The essence of the invention lies in the fact that in a monopulse radar system containing a pathogen, a synchronizer, on the first output of which start-up pulses with a frequency of repetition of sounding intervals are formed, and on the second - synchronizing pulses with a sampling frequency of the processed signals, a code generator and an amplitude modulator, the inputs of which connected to the first output of the synchronizer, a microwave transceiver unit, a signal processing, capture and tracking unit (OSZS), a detection unit of the selection and selection of the target and the prelaunch unit, the first input of which is connected to the output of the prelaunch signal sensor, and the fourth input and fourth output are connected respectively to the output of the speed sensor and the input of the start cancellation indicator, a signal processing unit for the passive radio channel (PRK) is additionally introduced, a priority correction unit, an antenna scanning control unit, an antenna drive control code switch, and a subtraction unit, an AND-OR element and an OR element, the output of which is connected to the first, starting, input of the antenna scanning control unit, the first output of which is connected to the second input of the antenna drive control codes switch, the third output is connected to the fourth input of the PRK signal processing unit, the fourth output is connected to the second input of the AND-OR element, and the second output to which forms the signal to end the scan, is connected to the second input of the signal processing unit of the PRK and to the third input of the OR element, the first input of which is connected to the output of the prelaunch signal sensor, and the second input, with unified with the third input of the PRK signal processing unit, connected to the fifth output of the prelaunch unit, the exciter outputs at which the local oscillator frequency signal and the intermediate frequency reference signal are formed are connected respectively to the second and third inputs of the SPS unit, and the output of the carrier frequency signal is connected to the second the input of the microwave transceiver unit, the first input of which is connected to the second output of the prelaunch unit, on which the phase manipulation code value is generated, the third input - with the output an amplitude modulator, and the fourth input is with the output of the antenna drive control code switch, the first input of which is connected to the output of the subtraction unit, and the control input connected to the eighth input of the capture signal, the SPS unit, is connected to the output of the AND-OR element, the first output, signals of the total channel, the microwave transceiver unit is connected to the fifth input of the OSZS unit and to the input of the broadband radio pulse detector, the output of which is connected to the fifth input of the PRK signal processing unit, second output, difference channel signals, b the microwave transceiver lock is connected to the sixth input of the OSZS unit, and the third output, signals of the current angular position of the antenna, is connected to the third input of the unit for detecting and selecting the target, with the sixth input of the PRK signal processing unit and with the third input of the prelaunch unit, the second input of which is connected with the output of the code generator, the first output of the prelaunch unit, on which the speed value is generated, is connected to the first input of the SPSS block, and the third output is connected to the first inputs of the signal processing block PRK and an AND-OR element, the third input of which is connected to the first output of the PRK signal processing unit, the second output of the PRK signal processing unit, on which the power amplifier power-off signal is generated, is connected to the fifth input of the microwave transceiver unit, and its third output and eighth input connected respectively to the first input and second output of the priority correction unit, the second input and the first output of which are connected respectively to the third output and the fourth input of the unit for detecting and selecting the target, the first you One of which is connected to the first input of the subtraction unit, the second input of which is connected to the second output of the SES unit, the fourth input, phase manipulation code, which is connected to the output of the code generator, and the first output and seventh input are connected respectively to the second input and second output of the detection unit and selection of the target, while the second input of the antenna scanning control unit, the first input of the detection and selection block of the destination and the ninth input of the SES block are connected to the first output of the synchronizer, and to the second you the synchronizer is connected to the seventh input of the PRK signal processing unit, the fifth input of the detection and selection unit of the destination and the tenth input of the OSZS block.

The invention is illustrated by a further description and drawings, on which are indicated:

FIG. 1 is a structural diagram of a monopulse radar;

FIG. 2 is a block diagram of an antenna scanning control unit;

FIG. 3-block diagram of the signal processing unit of the passive radio channel;

FIG. 4 is a block diagram of a unit for detecting and selecting a target;

FIG. 5 is a block diagram of a priority correction block;

FIG. 6 is a block diagram of a prelaunch training unit.

In FIG. 1 structural scheme monopulse radar adopted the following notation:

1 - pathogen;

2 - synchronizer;

3 - block ultra-high frequency (microwave) transceiver, made according to the well-known scheme according to patent No. 2309430 (prototype), including in FIG. 1 antenna, sum-difference converter, antenna switch or circulator, phase manipulator, power amplifier, high-frequency amplifier, power switch, directional coupler, antenna drive and antenna angular position sensor with corresponding connections;

4 - prelaunch unit (BPP), the structural diagram of which is shown in FIG. 6;

5 - signal processing, capture for tracking and tracking of the target object (hereinafter referred to as the signal processing, capture and tracking block (SSC), the implementation scheme of which is known from the description of patent No. 2309430 (prototype), and includes in Fig. 1 the following blocks: signal mixer of the sum and difference channels with a local oscillator signal, with band-pass filtering of mixed signals, an intermediate frequency amplifier of the signals of the sum and difference channels, phase quadrature detectors of the sum and difference channels, digital e matched filters for the sum and difference channels, Doppler compensators, quadrature combining unit, signal discriminators by range, frequency, and angle, Doppler frequency filter, signal combiner, time-domain code converter, Doppler frequency generators, adders and signal subtraction unit, code bus, valve block, signal capture block, register and delay elements with corresponding connections;

6 - amplitude modulator,

7 - code generator,

8 - speed sensor,

9 - block subtraction,

10 - signal prelaunch signal in the form of a single pulse,

11 - start cancellation indicator,

12 - switch control codes drive the antenna,

13 - element OR,

14 - control unit for scanning an antenna (BUS);

15 - broadband detector of radio pulses;

16 - signal processing unit passive radio channel (PRK);

17 - block correction of priorities;

18 is a block for detecting and selecting a target (BOW), the block diagram of which is shown in FIG. 4;

19 - an AND-OR element, into three inputs (Bx ₁ , Bx ₂ , Bx ₃ ). implements a logical function: Out = In ₃ or Out = Bx ₁ and Bx ₂ .

According to the block diagram of FIG. 1, the outputs of the heterodyne frequency signal and the reference signal of the intermediate frequency of the pathogen 1 are connected respectively to the second and third inputs of the signal processing, capture and tracking unit 5, and the output of the carrier frequency signal is connected to the second input of the microwave transceiver unit 3, the first input of which is connected to the second output ( code FM) of prelaunch unit 4, the third input with the output of the amplitude modulator 6, and the fourth with the output of the switch 12 antenna drive control codes.

The first and second inputs of the switch 12 are connected respectively to the output of the signal subtraction unit 9 and to the first output of the antenna scan control unit 14, and the control input of the switch 12 and the eighth input (capture signal) of the OSZS unit 5 are connected to the output of the AND-OR 19 element.

The first output (signals of the total channel) of the microwave frequency converter unit 3 is connected to the fifth input of the SPSS unit 5 and to the input of the broadband detector 15 of the radio pulses, the output of which is connected to the fifth input of the signal processing unit 16 of the passive radio channel. The second output (signals of the difference channel) of the microwave transceiver unit 3 is connected to the sixth input of the SPSS unit 5, and the third output (signals of the current angular position of the antenna) is connected to the third input of the target detection and selection unit 18, with the sixth input of the passive radio channel signal processing unit 16 and with the third input of the prelaunch unit 4, the first input of which is connected to the output of the sensor 10 of the prelaunch signal (in the form of a single pulse), the second input is connected to the output of the code generator 7, and the fourth to Exit velocity sensor 8.

The first output (speed signal) of the prelaunch unit 4 is connected to the first input of the SPSS unit 5, the third output is connected to the first inputs of the signal processing unit 16 of the passive radio channel and the AND-OR element 19, the fourth output is connected to the input of the start cancellation indicator 11, and the fifth output connected to the third input of the PRK signal processing unit 16 and to the second input of the OR element 13, the first input of which is connected to the output of the prelaunch signal sensor 10, and the third input connected to the second input of the PRK signal processing unit 16 is connected to the second output of the antenna scanning control unit 14, the first input of which is connected to the output of the OR element 13, the third output is connected to the fourth input of the PRK signal processing unit 16, and the fourth output is connected to the second input of the AND-OR element 19, the third input of which is connected to the first output of the PRK signal processing unit 16. The second output (power amplifier power off signal) of the PRK signal processing unit 16 is connected to the fifth input of the microwave frequency converter unit 3, and the third output and eighth input of the unit 16 are connected respectively to the first input and the second output of the priority correction unit 17, the second input and the first output of which are connected respectively, with a third output and a fourth input of the unit 18 for detecting and selecting a target.

The first output of the target detection and selection unit 18 is connected to the first input of the subtraction unit 9, the second input of which is connected to the second output of the SES unit 5, the fourth input of which (phase shift keying code) is connected to the output of the code generator 7, and the first output and the seventh input are connected respectively, with the second input and second output of the unit 18 for detecting and selecting the target.

The input of the generator 7 codes, the second input of the antenna scanning control unit 14, the first input of the target detection and selection unit 18, and the ninth input of the OSZS unit 5 are connected to the first output of the synchronizer 2, on which the starting (starting) pulses of the PID are generated with the repetition frequency of the probing signals and the input of the amplitude modulator 6. To the second output of the synchronizer 2, on which the pulse sequence with the sampling frequency of the received signals is formed, the seventh input of the PRK signal processing unit 16 is connected, fifth the first input unit 18 and selecting the detection target object and the tenth input unit 5 CPAR.

The antenna scanning control unit 14 is configured as shown in FIG. 2, on which are indicated:

20 is a delay element,

21 is a pulse counter,

22 - valve

23 - initial angle sensor,

24 - adder

25 - final angle decoder,

26 - static trigger.

According to FIG. 2, the first input of the static trigger 26, the second (zeroing) input of the pulse counter 21 and the input of the delay element 20, the output of which, forming the third output of the block 14, are also connected to the second input of the static trigger 26 are connected to the first (starting) input of the antenna scanning control unit 14 the output of which forms the fourth output of block 14. The first input of the valve 22 is connected to the second input (triggering pulses of the sensing interval) of block 14, the second (control) input of which is connected to the output of the static trigger 26, and the output is connected to the first (counting) input of the pulse counter 21, the output of which is connected to the first input of the adder 24. The second input of the adder 24 is connected to the output of the initial angle sensor 23, and the output of the adder 24, forming the first output of block 14, is also connected to the input of the final angle decoder 25 the output of which forms a second output (scan end signal) of the antenna scan control unit 14.

The signal processing unit 16 of the passive radio channel is made according to the scheme of FIG. 3, on which are indicated:

27 - counter sources of radio pulses,

28 - counter time intervals between radio pulses,

29, 30 - registers of the initial and final angles of the packet of radio pulses, respectively,

31 - shaper half angles,

32 - RAM angles of the sources of radio pulses,

33 - decoder the end of the allowable interval between radio pulses,

34-36 - static triggers,

37 - static trigger, self-resetting to zero when the power is turned on;

38-40 - delay elements,

41-47 - valves

48-52 - OR elements,

53 - AND element with prohibitory input,

54 - amplitude-time quantizer.

According to FIG. 3, the fifth input of the signal processing unit 16 of the passive radio channel, to which the signals are received from the broadband detector 15 of the radio pulses, is connected to the input of the amplitude-time quantizer 54, the output of which is connected to the zeroing input of the counter 28 time intervals between radio pulses, the second input of the static trigger 34, through the element 38 delay, the first input of the static trigger 35 and the first inputs of the valves 42, 43, while the second input of the valve 42 is connected to the direct output of the static trigger 35, the inverse output of which is connected to the second input of the valve 43. The output of the valve 42 is connected to the recording input of the register 29 of the initial angles in the packet of radio pulses and to the second input of the OR element 51, the first input of which is connected to the output of the valve 43, and the output is connected to the input of the register 30 of the final catch in the packet of radio pulses . The information inputs of the registers 29, 30 are connected to the sixth input of the PRK signal processing unit 16, to which the current value of the antenna angular position code is received from the microwave transceiver unit 3.

The reset inputs of the registers 29, 30 are connected to the output of the delay element 39, which through the valve 44 is also connected to the first input of the OR element 48 and directly connected to the second input of the OR element 50, the output of which is connected to the installation (second) input of the static trigger 35, and the first an input connected to the first input of the OR element 49 and to the resetting input of the counter 27 of the sources of radio pulses is connected to the fourth input of the PRK signal processing unit 16.

The seventh input of block 16, which receives synchronizing pulses from the second output of synchronizer 2, is connected through a valve 41 to the counting input of the counter 28 time intervals between radio pulses, the output of which is connected to the input of the decoder 33 of the end of the allowable interval between radio pulses, the output of which is connected to the input of element 39 delays with the second inputs of the OR element 52 and the OR element 49, the output of which is connected to the first input of the static trigger 34, and the output of the latter is connected to the control input of the valve 41.

The outputs of the registers 29 and 30 of the initial and final angles of a packet of radio pulses are connected to the inputs of the half-sum generator of angles 31, the output of which is connected to the information input of the RAM 32 of the radio pulse sources, the output of which forms the third output of the PRK signal processing block 16. The address input of RAM 32 is connected to the output of the counter 27 of the sources of radio pulses, and the recording input is connected to the output of the valve 46, the first input of which is connected to the output of the OR element 52.

The second input of the PRK signal processing unit 16, to which the scan end signal is received from the antenna scanning control unit 14, is connected to the first input of the OR element 52, to the second input of the valve 47, and also, through the delay element 40, to the second input of the static trigger 36 , the first input of which and the first input of the static trigger 37 are connected to the third input of the PRK signal processing unit 16, to which the control signal from the fifth output of the prelaunch unit 4 is received.

The direct output of the static trigger 36 is connected to the first input of the valve 47, to the second input of the AND element 53 with the inhibit input and to the second input of the valve 45, the first input of which is connected to the eighth input of the PRK signal processing unit 16, to which the signal from the second output of the block 17 priority correction, and the output of the valve 45 is connected to the second input of the OR element 48.

The inverse output of the static trigger 36 is connected to the control inputs of the valves 44, 46. The first input and output of the And 53 element with the inhibit input form respectively the first input and the second output of the PRK signal processing unit 16, the first output of which is the output of the static trigger 37, the second input of which is connected to valve outlet 47.

The unit 18 for detecting and selecting the target is made according to the circuit shown in FIG. 4.

In FIG. 4 the following notation is accepted:

55 - shift register

56 - random access memory (RAM),

57 - adder single bits,

58 - threshold block

59 - RAM availability of the target,

60 - RAM target intensity,

61 - RAM initial angle of the target,

62, 63 - comparison blocks,

64 - block memory intensity

65 - range memory unit,

66 - block memory angle

67 - half-adder,

68 - switch

69 - multiplier,

70, 71 - delay elements,

72-74 - And elements,

75, 76 - inverters,

77 - priority multiplier sensor,

78 - threshold block

79 - range counter.

According to FIG. 4 to the first input of the BOVO 18, which is the input to which the triggering pulses of the sensing interval are received, the input of the zeroing of the range counter 79 is connected, the output of which is connected to the recording input of the range memory unit 65 and the address inputs of the RAM 59 of the presence of the target, RAM 60 of the target intensity, RAM 61 the initial angle of the target and RAM 56. The outputs of RAM 56 are bitwise connected to the inputs of the bits of the shift register 55, starting from the second, and the input of the first bit of the register 55 of the shift is connected to the output of the threshold block 78, the input of which forms the second input of the BOW 18.

The third input of the BOW 18 is connected to the first input of the half-adder 67 and the write input of the RAM 61 of the initial angle of the target. The input of the synchronization BOVO 18 is connected to the input of the delay element 70 and the synchronization input of the shift register 55, the output of which is connected to the write input of the RAM 56 and the input of the adder 57 single bits.

The output of the adder 57 is connected to the input of the threshold unit 58, the first input of the comparison unit 62 and the write input of the RAM 60 of the target, the output of which is connected to the second input of the comparison unit 62 and the first inputs of the switch 68 and the multiplier 69, the second input of which is connected to the sensor 77 of the priority multiplier and the output is connected to the second input of the switch 68, the control input of which is the fourth input of the BOVO block 18.

The output of the switch 68 is connected to the first input of the comparison unit 63 and the recording input of the intensity memory unit 64, the output of which is connected to the second input of the comparison unit 63.

The output of the delay element 70 is connected to the synchronization inputs of the elements And 72 and 73 and the input of the delay element 71, the output of which is connected to the synchronization inputs of the RAM 59 of the target, RAM 56, and the element And 74, the output of which is connected to the synchronization input of the RAM 60 of the target intensity. The first input of the And 74 element is connected to the output of the comparison unit 62, and the second is connected to the output of the threshold block 58, which is also connected to the write input of the RAM 59, with the first input of the And 72 element and through the inverter 75 to the second input of the And 73 element.

The output of RAM 59 is directly connected to the first input of the And 73 element and, through the inverter 76, to the second input of the And 72 element, the output of which is connected to the synchronization input of the RAM 61 of the initial angle of the target, the output of which is connected to the second input of the half adder 67. The output of the half adder 67 is connected to the input of the recording unit 66 of the angle memory, the output of which forms the first output of the BOW 18.

The third input of the And 73 element is connected to the output of the comparison unit 63, and the output is connected to the synchronization inputs of the intensity memory block 64, the angle memory block 66, and the range memory block 65, the output of which forms the second output of the BOW 18. The output of the half adder 67 forms the third output of the BOW 18.

Priority correction block 17 is made according to the circuit shown in FIG. 5.

In FIG. 5 adopted the following notation:

80 - sensor value Δ allowable spread between the measured angles of the object in the active and passive radio channels,

81 - shaper of the lower boundary of the permissible angle of the object in the active channel, made in the form of a code subtractor,

82 - shaper of the upper boundary of the permissible angle of the object in the active channel, made in the form of an adder codes,

83 - block comparison with the lower border,

84 is a block comparison with the upper limit,

85 - element And,

86 - element And, generating a single pulse,

87 - inverter.

According to FIG. 5, the first input of the priority correction block 17, to which the value ψ _{IR of the} azimuthal angle of the first fixed source of radio emission comes from the PRK signal processing block 16, is connected to the first inputs of the lower and upper boundaries of the permissible angle of the object in the active channel, the second inputs of which are connected to the output of the sensor 80 of the value Δ of the permissible spread between the measured angles in the active and passive channels. The outputs of the shapers 81, 82 are connected to the first inputs of the comparison block 83 with the lower boundary and the comparison block 84 with the upper boundary, the second inputs of which are connected to the second input of the priority correction block 17, to which the current target value ψ _{A of the} target azimuth is received from BOVO 18 active radio channel. The first inputs of the And 85 element and the And 86 element generating a single pulse are connected to the output of the comparison unit 83 with a lower boundary. The second input of the And 85 element is directly connected to the output of the comparison unit 84 with the upper boundary and, through the inverter 87, the second input of the And 86 element. The outputs of the And 85, 86 elements form the first and second outputs of the priority correction block 17, respectively.

Prelaunch unit 4 is made according to the circuit shown in FIG. 6.

In FIG. 6 the following notation is accepted:

88 - counter counting,

89 - sensor initial range, made in the form of a bus,

90 - master range calculation generator,

91 - element delay code signal,

92 - control speed sensor, made in the form of a tire,

93, 94 - switches, respectively, a code signal and a speed signal,

95 - trigger trigger

96 - trigger cancel trigger

97 - control angle sensor, made in the form of a tire,

98 is a block comparison

99 - an element of delay during prelaunch preparation,

100 - element And,

101 - valve cancel start

102 - inverter

103 - delayed single pulse generator.

According to FIG. 6 to the first input of the prelaunch unit 4, to which the prelaunch start signal is supplied from the sensor 10, a delay element 99 is connected, the first inputs of the start trigger 95 and the start cancel trigger 96 and the setup input of the countdown counter 88, the recording input of which is connected to the sensor 89 initial range, and the synchronization input is connected to the output of the master oscillator 90 accounts range. The output of the counter 88 is connected to the control input of the controlled code signal delay element 91, the output of which is connected to the second input of the code signal switch 93, the output of which forms the second output of the prelaunch unit 4, and the first input of the switch 93 and the second input of the controlled delay element 91 are connected to the second the input of block 4, which receives the output signal of the generator 7 code.

The third input of the prelaunch unit 4, to which the current angular position code of the antenna is received from the microwave transceiver unit 3, is connected to the first input of the comparison unit 98, the second input of which is connected to the control angle sensor 97, and the output is connected to the first input of the And 100 element, and, through the inverter 102, - with the input of the gate 101 cancellation of the start, the output of which is connected to the second input of the trigger 96 cancellation of the start. The inverted output of the trigger cancellation trigger 96 forms the fourth output of block 4, and the direct output is connected to the third input of the AND 100 element, the second input of which and the control input of the cancellation gate 101 are connected to the output of the delay element 99 for the prelaunch time.

The output of the And 100 element is connected to the second input of the start trigger 95, the direct output of which is connected to the input of the delayed single pulse generator 103, the output of which forms the fifth output of the prelaunch unit 4. The third output of the pre-launch preparation unit 4 is connected to the inverse output of the start trigger 95, to which are also connected the control inputs of the code signal switch 93 and the speed signal switch 94. The output of the speed signal switch 94 and its first input respectively form the first output and the fourth input of the prelaunch unit 4, and the second input of the switch 94 is connected to the control speed sensor 92.

Monopulse radar system operates as follows.

The main mode of operation of the radar is the active mode. In the active mode of operation, the exciter 1 generates a carrier frequency signal supplied to the second input of the microwave transceiver unit 3, a local oscillator frequency signal and an intermediate frequency reference signal supplied to the second and third inputs of the signal processing, capture and tracking unit 5.

Synchronizer 2 generates at the first output trigger pulses (PIP) with a frequency of repetition of sounding intervals and synchronizing pulses at the second output with a sampling frequency of the received signals. Starting pulses are received, including the inputs of the generator 7 codes and amplitude modulator 6. In this case, the generator 7 codes generates a binary phase-shift keying code (FM), which is fed to the fourth input of block 5 of the SES, and also transmitted through the second input of block 4 of the prelaunch preparation its second output, from which it enters the first input of the microwave transceiver unit 3. The amplitude modulator 6 generates an envelope pulse that determines the duration of the probe signal, which is fed to the third input of the microwave transceiver unit 3.

In this case, in block 3, in a known manner, using a phase manipulator, a power amplifier, a power switch and an envelope signal from the output of the amplitude modulator 6, a phase-manipulated signal of a given duration and power is emitted through the antenna into space.

The echo signal received by the antenna with the help of a sum-difference converter and an antenna switch (circulator) is divided into total and difference channels, amplified in high-frequency amplifiers and fed to the first (total) and second (difference) outputs of the microwave transceiver unit 3, and from them - respectively, to the fifth and sixth inputs of block 5 OSZS.

In block 5, these signals of the sum and difference channels are mixed in a known manner with the local oscillator signal (fed to the second input of block 5) in bandpass filtered mixers, amplified in intermediate frequency amplifiers, and detected in quadrature phase detectors using the intermediate frequency reference signal (fed to the third input of block 5), they are compensated for by Doppler shift using Doppler compensators controlled by the UAV speed signal supplied to the first input of block 5 of the OSZS from the first exit of block 4 prelaunch.

Next, the signals from the Doppler compensators in a known manner enter the digital matched filters tuned by the signal from the fourth input of the block 5 OSZS to compress the pulse with the code received in the filters from the generator 7 codes. The signal from the CSF of the total channel after combining quadratures enters through the first output of block 5 to the second input of block 18 for detecting and selecting a target (BOVO).

As a result of the operation of block 18 (BOVO), which will be described below, at its first and second outputs, an angle signal and a range signal of the selected object are generated respectively, which are received respectively at the first input of the subtraction unit 9 and at the seventh input of the OSZS block 5.

Upon receipt of the “capture” signal at the eighth input of block 5, the formation of which will be described below, block 5 implements the capture and tracking of the selected object in a known manner using a range discriminator, a frequency discriminator of the magnitude of the Doppler shift, and an angular discriminator whose signal is transmitted through the second output of the block 5 is fed to the second input of the subtraction unit 9, the output of which is the difference between the values of the angles coming from the first output of the BOVO unit 18 and from the second output of the OSZS unit 5.

The specified differential angular signal from the output of block 9 is fed to the first input of the switch 12, the control input of which is connected to the eighth input of the block 5 of the SPS and connected to the output of the AND-OR 19. In the mode of capture and tracking of the object, this signal has a single value and ensures the formation of the output of the switch 12 of the signal corresponding to the signal at its first input. The specified signal from the output of the switch 12 is supplied through the fourth input of the microwave transceiver unit 3 to the control input of the antenna drive and, thus, closes the object tracking loop in angle.

Before switching to the active mode described above, the radar sequentially operates in several preliminary modes.

Before the radar starts operation, the prelaunch signal sensor 10 generates a single prelaunch trigger, which arrives at the first input of the prelaunch unit 4 and, through the OR element 13, at the launch (first) input of the antenna scan control unit 14. In this case, in block 4 of the prelaunch preparation, the indicated pulse starts the delay element 99 for the time of the prelaunch preparation, enters the installation input of the counter 88 of the countdown and writes the initial range code from the sensor 89 into it. Pulses from the master oscillator 90 are supplied to the clock input of the counter 88, under the influence of which the range code in the counter 88 decreases at a given speed.

The specified range code is fed to the input of the controlled delay element 91, which delays the signal received from the code generator 7 through the second input of the prelaunch unit 4 for a time corresponding to the simulated range to the object, and feeds it to the control input of the switch 93.

At the same time, the signal from the sensor 10 sets the start trigger 95 to the zero state and the start cancel trigger 96 to the single state. In this case, the signal from the inverted output of the trigger 95 goes to the third output of the prelaunch unit 4 and sets the UAV speed signal switch 94 and the code signal switch 93 from the code generator 7 in the control state, which leads to the formation of the control signal at the first output of the BPP unit 4 speed, and at the second output of block 4, the signal from the code generator 7, delayed in the controlled delay element 91.

The signals from the first and second outputs of the prelaunch unit 4 are supplied to the first inputs of the SPSS unit 5 and the microwave transceiver unit 3, respectively, and a single signal from the third output of the unit 4 is fed to the first inputs of the AND-OR element 19 and the passive radio channel signal processing unit 16 )

The start signal received at the first input of the antenna scanning control unit 14 sets the trigger 26 and the counter 21 to zero, as a result of which the code generated by the initial angle sensor 23 is set at the first output of the block 14, and the zero signal is set at the second output of the block 14 coming, including, to the second input of the PRK block 16, which leads to the formation of a zero signal at its first output, which arrives at the third input of the AND-OR 19 element and generates a zero signal at its output.

The zero signal from the output of the AND-OR element 19 sets the switch 12 in the transmission position to the output of the signal from its second input connected to the first output of unit 14, as a result of which the drive control signal is generated at the output of the switch 12, which is transmitted to the fourth input of the microwave transceiver unit 3 and starting to move the antenna to the initial angle corresponding to the signal of the initial angle sensor 23 in block 14.

The start signal from the output of the OR element 13 in the antenna scanning control unit 14 also arrives at the delay element 20 and after a delay time sufficient to set the antenna to the initial position corresponding to the signal from the sensor 23, it passes through the third output of the block 14 to the fourth input of the block 16 , and also sets the trigger 26 into a single state, the output signal of which is supplied through the fourth output of block 14 to the second input of the AND-OR element 19. At the same time, a single signal is generated at the output of the AND-OR 19 element, which arrives at the eighth input (capture signal) of the OSZS unit 5 and at the control input of the switch 12 of the antenna drive control codes, translating it into a state in which the antenna drive control signal corresponds to the code coming from the subtraction unit 9 to its first input.

Thus, the SES unit 5 and the antenna drive in the microwave transceiver unit 3 are transferred to the object tracking mode, and the signal from the third output of the prelaunch unit 4 through the first input of the PRK block 16 is fed to the inhibitory input of the And 53 element, providing a zero signal at the second output of the block 16 PRK and at the fifth input of block 3 of the microwave transceiver, disconnecting the power from the transmitter power amplifier in it.

Unit 3 of the microwave transceiver in prelaunch mode when the power is disconnected from the power amplifier does not emit a probing signal in a known manner, and the signal received at its first input from the second output of prelaunch unit 4 and representing a delayed signal of code generator 7 is converted using a phase manipulator and a carrier frequency signal coming from the pathogen 1 into a phase-shifted microwave signal simulating an echo signal from an object approaching at a given speed. This signal in the microwave transceiver unit 3 through a directional coupler enters the control input of the sum-difference converter, which leads to a simulation at the first and second outputs of block 3 in the total and difference channels of the signal from the target located at an azimuth angle different from the initial angle of the antenna position , and at a varying range with a given speed.

These signals of the total and difference channels in a known manner enter block 5 of the SPSS similarly to the active mode of operation of the radar described above.

At the same time, in block 5 of the SES, the simulated signal is maintained similar to the active mode of operation of the radar with the participation of block 9 of subtraction, switch 12, and the drive of the antenna in block 3 of the microwave transceiver, which leads to angular displacement of the antenna and a change in the signal from the sensor of the angular position of the antenna at the third output of the block 3 microwave transceiver.

The specified signal is fed, inter alia, to the third input of the pre-preparation unit 4 and in it to the first input of the comparison unit 98, in which this signal is compared with the signal of the control angle sensor 97.

When the compared codes coincide within the tolerance determined by the bit depth of the sensor code 97, a single signal is generated at the output of the comparison unit 98, which remains in the time interval while the antenna drive moves the antenna at the angular boundaries specified by the tolerance.

The nominal time interval for the implementation of the prelaunch mode is laid down in the delay element 99, at the output of which a single pulse is formed after the specified interval from the start pulse received at the first input of block 4 from the sensor 10.

If the pulse from the output of the delay element 99 does not coincide with a single signal at the output of the comparison unit 98, then, taking into account the inverter 102, a single signal is generated at the output of the valve 101, which sets the trigger to cancel trigger 96, the inverse output of which is the fourth output of block 4 BPP, the signal from which is fed to the indicator 11 cancellation of the start. At the same time, the direct output of the trigger 96 with its signal blocks the element And 100.

If the pulse from the output of the delay element 99 coincides with the single signal of the comparison unit 98, which means that the entire equipment under test is operational, then a single signal is generated at the output of the And 100 element, which sets the trigger 95 of the trigger to a single state.

At the same time, a zero signal is generated at the third output of the prelaunch unit 4, opening the And 53 element in the passive channel signal processing unit 16 through its first input and also coming to the first input of the AND-OR 19 element, the output of which also produces a zero signal that cancels the mode capture-support from the eighth input of the block 5 OSZS and switching switch 12 to the passage of the signal from its second input.

In addition, the zero signal from the inverted output of the trigger 95 switches the switches 94 and 93 in the pre-launch preparation block 4 from the control state to the standard state, in which the signals from the standard speed sensor 8 are transmitted to the fourth input of block 4 to the first and second outputs of block 4 , and the signals of the code generator 7 directly, bypassing the delay element 91 transmitted from the second input of block 4 to its second output. Thus, all elements of the radar are in a state of readiness for regular work.

At the same time in the block 4 prelaunch preparation, the signal from the direct output of the trigger 95 is fed to the input of the generator 103 of the delayed single pulse. The delay in the generator 103 provides the movement of the UAV, on which the radar is installed, in the zone of regular operation. After the set delay time has passed, a single pulse is generated at the output of the generator 103, which arrives at the fifth output of block 4.

The pulse generated at the fifth output of block 4 transfers the radar into the passive radio channel operation mode. The specified pulse is supplied through the OR element 13 to the first input of the antenna scanning control unit 14 and directly to the third input of the PRK signal processing unit 16.

In block 14, at the same time, as described above, the counter 21 and the trigger 26 are set to zero and a delay is provided in element 20 for the time the antenna is set to the initial state determined by the sensor 23.

In the PRK signal processing block 16, the pulse received at the third input is transmitted to the zeroing inputs of the triggers 36 and 37. The zero signal from the direct output of the trigger 36 locks the valve 45 and the I 53 element, and a single signal from the inverse output of the trigger 36 opens the valves 44 and 46 .

After the delay time has passed, the output signal of the delay element 20 in the scan control unit 14 sets the trigger 26 to a single state, the output signal of which is supplied to the fourth output of the block 14, and also opens the valve 22 through which the clock input of the counter 21 from the second input of the scan control unit 14 pulses of the start of the sounding interval from the synchronizer 2 are received. The output signal of the counter 21 is added to the signal of the sensor 23 in the adder 24, the resulting code of which is supplied to the final decoder 25 ode on the first WCD output unit 14, from which through a second input of the switch 12 as a control signal to the switch output fed to a fourth input of the microwave transceiver unit 3, resulting in the antenna drive movement with a constant scanning velocity space.

Simultaneously with the start of scanning, the output pulse of the delay element 20 enters through the third output of block 14 to the fourth input of the PRK signal processing block 16, resetting the state of trigger 34 through the OR element 49, zeroing the counter 27 of the radio signal sources, and setting the trigger 35 to the single state via the OR element 50. The receipt of a single signal from the fourth output of the block 14 BUS for the second input of the AND-OR 19 element does not cause changes in its output signal.

The fifth input of the PRK signal processing unit 16 receives a signal from a broadband detector 15 of radio pulses connected to the first output (total channel) of the microwave transceiver unit 3, the sixth input of the unit 16 receives the signal of the antenna angle sensor from the third output of the microwave transceiver unit 3, and the seventh the input of block 16 receives a pulse sampling signal from the second output of the synchronizer 2.

Thus, the processing of the PRK signals in the scanning mode of the antenna space is started.

The signal of the detector 15 radio pulses from the fifth input of block 16 enters the amplitude-time quantizer 54, tuned to a threshold signal level above the noise background. In the case of the appearance of a radio pulse in the broadband receiving path of the radar, a positive pulse is generated at the output of the amplitude-time quantizer 54, which sets the trigger 34 to a single state, resets the counter 28, passes through the valve 42, opened by the signal of the trigger 35, and enters the register entry 29 of the initial angle the source of the radio signals and, through the OR element 51, to the recording input of the register 30 of the final angle of the source of the radio signals.

The information inputs of registers 29 and 30 are fed with the current value of the angle sensor code from the sixth input of the PRK signal processing unit 16.

Thus, the same current value of the angle of the antenna is recorded in the registers 29 and 30, after which, with the delay generated by the element 38, the pulse from the output of the amplitude-time quantizer 54 sets the trigger 35 to zero, closing the valve 42 and opening the valve 43.

If after this, a new pulse is detected at the fifth input of the PRK block 16 after a short time interval, then this pulse passes through the open gate 43, the OR 51 element and writes to the register 30 the new value of the final angle from the sixth input of the PRK signal processing block 16.

Each new pulse from the amplitude-time quantizer 54 resets the counter 28, to the clock input of which the clock pulses are received through the open valve 41. The contents of the counter 28 characterizes the time elapsed since the last pulse arrived and was detected from the radio signal source.

The output of counter 28 is connected to a decoder 33 configured for a time interval corresponding to the maximum sounding interval of typical radars.

If the counter 28 is not reset to zero for a longer period of time, then the decoder 33 is activated, forming a pulse of the end of the reception of pulses from the source of radio signals.

The specified pulse from the output of the decoder 33 passes through the element OR 49, resets the state of the trigger 34 and closes the valve 41.

In addition, the specified pulse passes through the OR element 52 and the open valve 46 to the write input of the RAM 32. In this case, the signals from the outputs of the registers 29 and 30 corresponding to the angles of the beginning and end of the pulse train from one radio signal source are sent to the half-summing unit 31 of the input codes.

The output signal of block 31, corresponding to the average angle of the packet of detected radio pulses, is fed to the information input of RAM 32 and is recorded by a pulse from gate 46 to the address formed by the counter 27 connected to the address input of RAM 32.

The output pulse of the decoder 33 is delayed by the delay element 39 and after performing the above operations, the output of the delay element 39 is supplied through the open valve 44, the OR element 48 to the counter clock input 27, increasing the RAM address 32 by one to record information about the next radio signal source.

In addition, the signal from the output of the delay element 39 goes to the resetting inputs and resets the registers 29 and 30, and also through the OR element 50 it goes to the installation input of the trigger 35, preparing the unit for receiving information about the next radio signal source.

The foregoing process continues throughout the scanning of the antenna. The end of the scan is determined by the decoder 25 in the block 14 of the scan control. When the adder 24 reaches the value corresponding to the final angle of rotation of the antenna, the decoder 25 is activated, and a single pulse of the end of the scan is generated at its output.

The specified pulse from the second output of the scanning control unit 14 enters the second input of the PRK signal processing unit 16, passes through the OR element 52 and the valve 46 to the write input of the RAM 32, and writes information about the last source of the radio signal into it, if the packet of the corresponding pulses was not completed earlier. After that, with a delay on the delay element 40, the signal from the second input of the PRK block 16 sets the trigger 36 to a single state, opening the valve 45, closing the valves 44 and 46 and forming at the second output of the PRK block 16 a single signal arriving at the fifth input of the microwave unit 3 transceiver and providing inclusion of the power amplifier in block 3.

Thus, after scanning the space with a passive radio channel in RAM 32, the average values of the angles from the bursts of radio pulses of the detected radio signal sources are recorded sequentially in the addresses starting from zero.

The pulse from the second output of the block 14 BUS also comes through the element OR 13 to the first input of the block 14, after which the scan begins in the active mode of operation of the radar.

At the same time, in the scanning control unit 14, the counter 21 and the trigger 26 are reset to zero, similar to the above procedures, a delay is provided in the delay element 20 for the antenna installation time determined by the sensor 23, after which the valve 22 opens, and the counter 21 starts to count incoming trigger pulses sounding intervals.

The output of the adder 24 is a gradual increase in the code, which is fed to the input of the switch 12 and converted into a control signal supplied to the fourth input (control the drive of the antenna) of unit 3 of the microwave transceiver.

Due to the fact that, as discussed above, at the end of the antenna scanning in the passive mode, the power amplifier was turned on in the microwave transceiver unit 3, during the turn of the antenna, a sounding pulse signal is generated in each sounding interval.

The echo signals reflected from objects in a known manner are received by the microwave transceiver unit 3, amplified in the sum and difference channels, and transmitted through the first and second outputs of the microwave transceiver unit 3 to the fifth and sixth inputs of the OSZS unit 5. In block 5 of the SES, these signals are processed in a known manner, as a result of which a signal compressed in a digitally matched filter is generated at the first output of block 5 of the SES, which is fed to the second input of the block 18 for detecting and selecting a target.

The first input of the BOVO 18 receives the pulses of the start of the sounding interval from the first output of the synchronizer 2, and the fifth input receives the sampling clock from the second output of the synchronizer 2, which respectively arrive at the zeroing and counting inputs of the counter 79, as a result of which the current range code is generated at its output.

The signal from the second input of the BOVO 18 is fed to the input of the threshold block 78, where it is compared with the threshold signal set in it, as a result of which the binary signal is generated at the output of the block 78 and fed to the input of the shift register 55. The clock signal from the fifth input of the BOVO 18 is fed to the clock input the shift register 55 and the delay element 70. In this case, the signal from the output of the threshold block 78 is recorded in the first bit of the shift register 55, and the signal from the output of the RAM 56 from the cell whose address is determined by the signal of the current range coming from the range counter 79 is recorded with a shift in the remaining bits, starting from the second .

The specified code of the current range element from the output of the counter 79 also arrives at the address inputs of the target availability RAM 59, the target intensity RAM 60, the target angle RAM 61 and the recording input of the range memory 65. The signal from the output of the shift register 55 is fed to the input of the RAM 56 and is written to it by a clock from the fifth input, which passed through the delay elements 70 and 71.

Thus, after a certain number of sounding intervals in the cells of RAM 56, a packet of single signals is formed corresponding to a packet of reflected pulses from the target, or a noise collection of random single signals against the background of a large number of zero bits.

The signal from the output of the shift register 55 is also fed to the input of the adder 57 single bits, the output of which at the same time generates a code equal to the number of single bits in the output signal of the register 55 shift. The output signal of adder 57 is input to a threshold block 58, where it is compared with a predetermined target detection threshold by the logic K from N, where K is the number of unit bits in register 55, and N is the total number of bits in it.

If the specified threshold is exceeded, which corresponds to target detection in the current range element, the single output signal of the threshold block 58 is supplied to the And 72 element, the second input of which through the inverter 76 receives a signal from the RAM 59 of the presence of the target. If in the previous sensing interval a zero signal was recorded in the current RAM cell 59, indicating the absence of detection, then the unit output signal of the inverter 76 coincides with the unit output signal of the threshold unit 58, which indicates the beginning of a packet of pulses reflected from the target. In this case, the clock pulse passes through the And 72 element from the output of the delay element 70, which is fed to the synchronization input of the RAM 61 and writes to its cell, corresponding to the current range element, the code of the angle of the beginning of the pulse train from the target, received from the antenna angular position sensor through the third input of the BOW 18 from the third output of the block 3 of the microwave transceiver.

The output signal of the adder 57 single bits, characterizing the intensity of the target in the current range element, also goes to the input of the RAM 60 of the target and to the first input of the comparison unit 62, to the second input of which comes from the RAM 60 the signal of the target intensity for the current range element recorded in it in the previous sensing interval. If the signal of the adder 57 exceeds the signal of the RAM 60, then a single signal is generated at the output of the comparison unit 62, which is fed to the first input of the And element 74, the second input of which receives the output signal of the threshold block 58. If this signal is single, which indicates When a target is detected, then a clock pulse passes through the AND element 74 from the output of the delay element 71 and records the target intensity in the target intensity RAM 60.

As a result of repeated repetition of the above operations in the RAM 60, the maximum target intensity for each element of the range is entered. In the case when in the current sounding from the threshold block 58 a zero signal is received, indicating the absence of detection, and from the RAM 59, the presence of the target is a single signal indicating the presence of detection in the previous sounding interval, this combination of signals indicates the end of the packet in the current element range. In this case, the unit And 73 receives two single signals: from RAM 59 and, through the inverter 75, from block 58.

At this time, from RAM 60, the signal of maximum target intensity for the current range element is supplied to the first information input of switch 68, to the second information input, which receives the same signal of maximum target intensity, but multiplied in multiplier 69 by a multiplier coefficient installed in the multiplier sensor 77 priority.

The control input of the switch 68 receives a signal from the fourth input of the BOW 18.

Through the switch 68, the BOVO 18 interacts with the PRK signal processing unit 16, which is implemented as follows. The pulse from the output of the delay element 20 through the third output of the scanning control unit 14 is fed to the fourth input of the PRK signal processing unit 16 and resets the counter code 27 to the address input of the RAM 32, in which the angular coordinates of the sources of radio emission detected on the previous scan are fixed.

In this case, the azimuthal angle of the first fixed source of radio signals Ψ _{IR is} supplied to the output of RAM 32 and, accordingly, to the third output of the PRK block 16. This signal is transmitted to the first input of the priority correction block 17, in which boundary signals arriving are formed using the sensor 80 of the allowable spread between the measured object angles in the passive and active modes, formers 81 and 82, respectively, of the lower boundary and the upper boundary of the permissible angle in the active mode to the first inputs of comparison blocks 83 and 84, respectively. The second inputs of the indicated comparison blocks receive the current value of the angle Ψ _{A of the} active radio channel from the third output of the detection and selection unit 18 of the destination through the second input of the priority correction block 17.

If the current value of the angle Ψ _A is between the lower and upper permissible boundaries, the output signals of the comparison blocks 83 and 84 through the And 85 element form a single control signal of the receiver, which through the first output of the block 17 is fed to the fourth input of the BOW 18 and from it to the control input switch 68.

At a zero value of this signal, the signal of maximum target intensity passes directly from the output of RAM 60 to the output of switch 68, and at a single value, the signal of maximum intensity is multiplied additionally in block 69 by the coefficient of block 77 of the priority multiplier.

Thus, if the current angle corresponding to the target detected in the ARC coincides within the specified tolerance with the azimuthal angle of the radio signal source detected in the receiver, then the priority of such a target is increased in a predetermined proportion.

If, as the antenna is scanned, the current value of the azimuthal angle of the target at the third output of the BOVO 18 is outside the upper acceptable limit, then in the priority correction block 17 at the output of the comparison unit 84 with the upper limit, a zero signal is generated, which resets the signal at the first output of the block through the And 85 element 17 and, accordingly, through the fourth input of the BOW unit 18, the control signal of the switch 68, as a result of which the priority of a possible detectable target is reduced.

At the same time, in the priority correction block 17, the zero signal from the output of block 84 through the inverter 87 opens the And 86 element, the output of which generates a single pulse, which through the second output of block 17 goes to the eighth input of the PRK block 16, passes through the open valve 45 and the OR element 48 to the sync input of the counter 27 of the radio signal sources and generates the address of the next source, arriving at the address input of the RAM 32. In this case, the angle of the next detected radio signal source is formed at the third output of the PRK block 16.

In the block 18 for detecting and selecting the target, the signal from the output of the switch 68, which is a signal of the maximum target intensity for the current range element, taking into account the information of the PRK channel about the detected sources of radio emissions, is sent to the intensity memory block 64 and to the comparison block 63. The second input of the comparison unit 63 receives a signal from the intensity memory unit 64 recorded in it in one of the previous sounding intervals. A single signal is generated at the output of the comparison unit 63 in the event that the current intensity signal from the output of the switch 68 exceeds the intensity signal recorded in the memory block 64 earlier. A single signal from the output of the comparison unit 63 is fed to the third input of the And 73 element, opening it to pass a clock from the output of the delay element 70.

Thus, an impulse is formed at the output of the And 73 element at the moment of the end of the packet of reflected pulses from the target, the intensity of which exceeds the intensity of the targets detected earlier, taking into account the information from the receiver.

The pulse from the output of the element And 73 is fed to the clock input of the intensity memory unit 64 and writes a signal of the current intensity into it. As a result of repeated repetition of the above operations, the maximum intensity of the target detected by the radar, taking into account the information of the ARC and PRK, is recorded in the intensity memory block 64.

The pulse from the output of the And 73 element also arrives at the sync input of the range memory unit 65 and records the range signal of the detected target with the highest priority in it.

The current value of the angle of rotation of the antenna through the third input of the BOW 18 also goes to the first input of the half-adder 67, the second input of which receives the angle code of the beginning of the pulse train from the target for the current range element from the RAM 61. At the output of the half-admitter 67, a signal is added to the half-sum of the angular positions of the antenna corresponding to the beginning of the packet of reflected pulses and the current time.

At the time of the formation of the pulse at the output of the And 73 element (the end of the pulse train from the target), the signal at the output of the half adder 67 is equal to the half sum of the coordinates of the beginning and end of the pulse train reflected from the target, which corresponds to the angular coordinates of the target. This signal enters the block 66 of the angle memory and is written into it by the output pulse of the element And 73.

After repeatedly performing the above operations, the coordinates of the target detected by the radar and having the maximum intensity taking into account the information of the receiver are recorded in blocks 65 and 66 of the range and angle memory.

Thus, by the end of the scan in active mode, the coordinates of the azimuthal angle and range of the highest priority of the detected targets are formed at the first and second outputs of the target detection and selection block 18.

Upon completion of the scan, as described above, a single pulse is generated at the second output of the scan control unit 14, which is supplied to the second input of the PRK unit 16. In block 16, this pulse passes through the open valve 47 to the installation input of the trigger 37, setting it in a single state. The output signal of the trigger 37 is supplied to the first output of the block 16 and from it through the AND-OR 19 element to the eighth input of the block 5 of the OSZS and to the control input of the switch 12.

In this case, the radar switches to the tracking mode of the selected target in a known manner similar to the prototype.

Based on the above description and drawings, the proposed device can be manufactured using well-known components and technological equipment known in the electronics industry and used on movable media as a radar for detecting and tracking targets.

Sources of information

1. Leonov A.I., Fomichev K.I., Monopulse radar. M., Sov. Radio, 1970

2. Reference radar. / Ed. M. Skolnik., M., Sov. Radio. - 1978 T. 4.

3. RF patent No. 2178896, IPC GO1S 13/44, publication January 27, 2002.

4. RF patent No. 2309430, IPC GO1S 13/44, publication October 27, 2007, prototype.

Claims (1)

A monopulse radar system containing an exciter, a synchronizer, at the first output of which trigger pulses with a frequency of repetition of sounding intervals are formed, and at the second - synchronizing pulses with a sampling frequency of the processed signals, a code generator and an amplitude modulator, the inputs of which are connected to the first output of the synchronizer, a microwave unit (UHF) transceiver, signal processing, capture and tracking (OSZS) unit, unit for detecting and selecting a target, and a presc block art preparation, the first input of which is connected to the output of the prelaunch signal sensor, and the fourth input and fourth output are connected respectively to the output of the speed sensor and the input of the start cancellation indicator, characterized in that a passive radio channel signal processing unit (PRK) is introduced into it, a correction unit priorities, the antenna scanning control unit, the antenna drive control code switch, as well as the subtraction unit, the AND-OR element and the OR element, the output of which is connected to the first, starting, input of the control unit scanning the antenna, the first output of which is connected to the second input of the antenna drive control code switch, the third output is connected to the fourth input of the PRK signal processing unit, the fourth output is connected to the second input of the AND-OR element, and the second output, on which the scan end signal is generated, connected to the second input of the PRK signal processing block and to the third input of the OR element, the first input of which is connected to the output of the prelaunch signal sensor, and the second input connected to the third input of the block signal processing PRK, connected to the fifth output of the prelaunch unit, the outputs of the pathogen, which generates the local oscillator frequency signal and the reference signal of the intermediate frequency, are connected respectively to the second and third inputs of the SPS unit, and the output of the carrier frequency signal is connected to the second input of the microwave transceiver unit, the first input of which is connected to the second output of the prelaunch unit, on which the phase manipulation code value is generated, the third input - with the output of the amplitude modulator, and the fourth the fourth input - with the output of the antenna drive control code switch, the first input of which is connected to the output of the subtraction unit, and the control input connected to the eighth input of the capture signal, the SPS unit, is connected to the output of the AND-OR element, the first output, of the signals of the total channel, the microwave transceiver unit is connected to the fifth input of the OSZS unit and to the input of a broadband radio pulse detector, the output of which is connected to the fifth input of the PRK signal processing unit, the second output, the difference channel signals, the microwave transceiver unit nen with the sixth input of the SPSA unit, and the third output, signals of the current angular position of the antenna, is connected to the third input of the detection and selection unit of destination, with the sixth input of the signal processing unit PRK and with the third input of the prelaunch unit, the second input of which is connected to the output of the generator code, the first output of the prelaunch unit, on which the speed value is formed, is connected to the first input of the SPSS block, and the third output is connected to the first inputs of the PRK signal processing block and the AND-OR element, the third input which is connected to the first output of the PRK signal processing unit, the second output of the PRK signal processing unit, on which the power amplifier power off signal is generated, is connected to the fifth input of the microwave transceiver unit, and its third output and eighth input are connected respectively to the first input and second output of the unit priority correction, the second input and the first output of which are connected respectively to the third output and the fourth input of the detection and selection unit of the destination, the first output of which is connected to the first input the house of the subtraction block, the second input of which is connected to the second output of the OSZS block, the fourth input, of the phase manipulation code, which is connected to the output of the code generator, and the first output and seventh input are connected respectively to the second input and second output of the detection and selection block of the target this connects to the first output of the synchronizer the second input of the antenna scanning control unit, the first input of the detection and selection unit of the destination and the ninth input of the SPS unit, and connected to the second output of the synchronizer the seventh input of the PRK signal processing block, the fifth input of the detection and selection block of the target, and the tenth input of the SES block.

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