Device for jamming radar stations

 

(57) Abstract:

Usage: in radio engineering for electronic countermeasures radar detection and tracking. The inventive device for jamming radar stations contains a receiving antenna 1, the input key 2, the amplifier 3 high frequency (UHF), switch 4, the splitter 5, the band-pass filter 6, a detector 7, the amplifier 8, the imaging unit 9 of the control signal, the key 10, a decoder 11, the adder 12, the output UHF 13, the generator 14, the gate pulses, transmitting antenna 15, block 16 measuring the length of the review cycle of the radar station, unit 17 of the control and synchronization , channel key. The technical result - improving the efficiency of station radar detection and tracking. 4 Il.

The invention relates to electrical engineering and can be used for jamming radar detection and tracking.

Known station interference with the lock on the frequency of the suppressed agent containing the receiving-transmitting antenna switch of acceptance, the pulse generator UHF transceiver, mixer, receiver, amplifier, limiter, discriminator, cascades of sound frequency, frequency, frequency, modulator and a frequency modulator, performing alternate switching on of the transmitter and receiver determines the frequency of the radar signals of the enemy and automatically rebuild the transmitter frequency to the frequency of the received signal [1]

A disadvantage of the known station interference (JV) is the low channels, as in the situation when the directivity of the antenna (BOTTOM) JV is multiple radars operating at different frequencies will be suppressed only one of them.

Also known electronic jamming, containing the receiving antenna, a receiver, a filter, a generator of a continuous signal, the detector signal, pulse generator, a Gating scheme and transmitting antenna provides a CW signal at the operating frequency of the radar, interrupted simultaneously with each pulse repetition period of the radar received by the receiver [2]

A disadvantage of the known system of electronic jamming is odnogolosy to serve purposes in circumstances where the BOTTOM can be several of them.

The closest in technical essence to the proposed JV is a multi-channel avtomatizirovan the th antenna, the input switch, the amplifier high frequency (UHF), the switch, the output amplifier of high frequency and transmitting antenna and the splitter, the input connected to the output of the amplifier high frequency and the switch input and N outputs connected to respective inputs of chains, each of which consists of series-connected band-pass filter, a detector, an amplifier (WAC), the gate driver control, key switch circuit, a second input connected to the output of the corresponding bandpass filter, and the output is connected to respective of the N inputs of the adder, the output of which is connected to the output switch and the first input of the output amplifier high frequency, a second input connected to a second output of the shaper strobe, the first output of which is connected to a second input of the input switch [3]

A disadvantage of the known device is that it effectively creates interference airborne radar (radar), working in close frequencies (in one frequency channel). In the situation when at the BOTTOM of the JV is several radar and they work on different frequencies in different frequency channels) due to the increased width of the spectrum of the interference power density interference with the x, the power density of the interference posed by each of them, will be reduced in two times, and therefore the range of suppression will decrease 1.4 times.

The purpose of the invention increase the efficiency of the station radar detection and tracking.

In Fig.1 shows a structural electrical circuit station interference; Fig.2 block diagram of the unit of measurement of the cycle duration of the review radar station (radar), and Fig.3 is a graph according to the probability of correct tracking of targets on the signal to noise ratio = q2(1+V2in terms of UWB and SPP; Fig.4 the algorithm for determining the parameters of noise intermittent noise (l the number of suppressed ESBL, m(l) numbers of frequency channels, p(l) the duration of the intermittent interference, Tp(l) the repetition period of intermittent interference).

Device for jamming radar stations contains a receiving antenna 1, the input key 2, the amplifier 3 high frequency (UHF), switch 4, the splitter 5, the band-pass filter 6, a detector 7, the amplifier 8, the imaging unit 9 of the control signal, the key 10, a decoder 11, the adder 12, the output UHF 13, the generator 14, the gate pulses, transmitting antenna 15, block 16 measuring the length of the review cycle, radar, block 17 UI element 19, the key 20, the trigger 21 separate run, a differentiating circuit 22, a diode limiter 23, standby multivibrator 24, the trigger 25 managed accounts running, the meter 26 time intervals.

Device for jamming radar stations operates as follows.

The signals taken by the receiving antenna 1 through the opened in exploration mode input key 2, amplified UHF input 3, in accordance with its carrier frequency through a band-pass filter 6 will get along with the noise signal in one frequency channel is detected by the detector 7 is amplified by the amplifier and fed to the generator 14 of the control signal channel and the block 16 measuring the duration of the cycle of the review radar. In response to the received signal, the amplitude of which exceeds a certain threshold level of the imaging unit 9 of the control signal U in this frequency channel is the closure of the key 10. In block 16 of the measurement of the cycle duration of the review radar signals, exceeded the threshold of threshold element 19, through the open in the initial state, the key 20 are received at the first input of the trigger 21 separate run, throw him down.

At the output of the differentiating circuit 22 is formed sharp pulse, which is sa standby multivibrator 24 is chosen from the condition of exceeding the duration of the radiation of the radar station interference in the review. The pulse output standby multivibrator 24 is fed to the trigger 25 managed accounts start to the second input key 20 and the second input of the trigger 21 separate run. Under the influence of the pulse output standby multivibrator 24 is tilting trigger 21 separate starting in the initial state, rollover trigger 23 managed by the counting starts, and the key 20 stops flowing to the input unit 16 of the measurement cycle time overview of radar pulses, radar during the time until the BOTTOM of the radar detection and tracking continues to be focused on SP.

At the next review cycle radar detection and tracking all described the work of the joint venture is repeated. When the trigger 25 managed accounts start re-tipped. At its output the results of two cycles of review radar detection and tracking is pulse equal in duration to the cycle of the review of this radar. This pulse is input to the meter 26 time slots of the channel.

Information about the duration of the review cycle radar detection and tracking in this frequency channel in the form of a digital code supplied from the output of the meter 26 temporary corresponding inputs of a block 17 with other frequency channels.

In block 17 on the basis of information received from the frequency channels produces a solution (one of the options implemented algorithm in block 17 shown in Fig. 4) the number of frequency channels on which there will be interference, and the interference parameters (duration, period) in each of the frequency channels suppressed.

In accordance with this decision unit 17 in the mode of jamming will issue sequentially in time with the cycle equal to the repetition period of the interference Tpin the form of parallel digital code information about the numbers of frequency channels on the decoder 11. The decoder 11, by recognizing the code combination, provides a corresponding output control signal to the corresponding code combination channel key 18. The duration of each control signal is determined by the duration of the interfering signal for the channel specified by the block 17.

Thus, the channel key 18 of the corresponding channel will be open for a time equal to the duration and repetition period of the interference in this frequency band.

The interference signal is formed by modulating the received signal radar thermal noise, passing through the public keys 10, which adopted the signals to the in the adder 12, and the gain in the output UHF 13.

Intermittent noise disturbance from the output of the output UHF 13 is fed to the transmitting antenna 15 and is emitted in the direction of the suppressed radar detection and tracking.

When entering the block 17 information about the operation of radar detection and tracking with multiple frequency channels it in accordance with its algorithm determines the number of suppressed radar, the order of their suppression and settings intermittent interference in the frequency channel.

1. DEVICE FOR JAMMING RADAR STATIONS containing connected in series receiving antenna, the input key, the amplifier high frequency (UHF), the switch output UHF and transmitting antenna and the splitter, the input connected to the output of the UHF and N outputs of the splitter connected to respective inputs of the N channels, the outputs of which are connected to the inputs of the adder, and the oscillator strobe pulses, the first and second outputs of which are connected respectively to the control inputs of the input key and UHF output, the output of which is connected the output of the adder, each channel contains a key and a serially connected band-pass filter, detector, amplifier, shaper signal upravlinnyalisovogo filter, characterized in that the input connected in series control unit and synchronization, performing the selection of the frequency channel and the formation of interference parameters, and the decoder, and each channel has been output channel key and the unit of measurement of the cycle duration of the review radar station (radar), an input connected to the second output of the amplifier, and the output unit of measurement of the cycle duration of the review radar is connected with the corresponding input of the control unit and synchronization, while the N outputs of the decoder are connected to control inputs of the respective output channel key information inputs which are connected to the outputs of the respective keys.

2. The device under item 1, characterized in that the unit of measurement of the cycle duration of the review radar contains serially connected threshold element, the input of which is the input unit of measurement of the cycle duration of the review radar, the key trigger with separate run, a differentiating circuit, a diode limiter, standby multivibrator trigger with managed accounts and start measuring time intervals, the output of which is the output of the measurement unit length of the review cycle, radar, and out of standby Multifibre

 

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