A device for receiving signals from a pseudo-random operating frequency tuning

 

The device relates to electrical engineering and can be used in communication systems with pseudorandom change the operating frequency. The technical result - increased robustness to narrowband interference. In the device of the reception signal with pseudorandom change the operating frequency due to the introduction of the second, third and fourth bandpass filters, second and third multiplier products, unit impulse noise blanking, attenuator, the first and second myCitadel, limiter, synchronous-phase filter and the first, second, third and fourth delay elements is achieved by the formation of the assessment of narrow-band interferences with their subsequent compensation, using the obtained evaluation result information symbols transmitted at frequencies affected narrowband interference, not distorted. 2 Il.

The invention relates to the field of radio and may find application in communication systems with pseudorandom change the operating frequency.

The known device for receiving signals with pseudorandom change the operating frequency, as described in the article by C. I. Borisova "radio System with expansion of the range of signals, Theory and technique radios the Moscow, "Communication", 1979, pp. 191-192, the lack of which is a low immunity to narrowband interference.

The closest to the technical nature of the present device is a device for receiving signals from a pseudo-random operating frequency tuning, described in the monograph by C. I. Borisov and other "noise Immunity of radio communication systems with expansion of the range of signals, the method of pseudo-random adjustment of the operating frequency, the publishing house "Radio I Svyaz', Moscow, 2000, page 24, Fig. 1.7 b, taken as a prototype.

Structural diagram of the prototype is shown in Fig.1, where indicated: 1, 3, the first and second bandpass filters; 2 - multiplier (mixer); 4 - demodulator; 5 - generator pseudo-random code; 6 - tunable frequency synthesizer.

The device prototype includes serially connected first band-pass filter 1, the inlet of which is the input of the multiplier 2, the second band-pass filter 3, a demodulator 4, the output of which is the output of the device, and the generator of pseudo-random code 5, n outputs connected to the n control inputs tunable frequency synthesizer 6, an output connected to the second reference input of the multiplier 2.

Device-prototype works SL is raikou operating frequency, representing a sequence of N radio pulses durationomodulated information whose carrier frequencies are changed by a given pseudo-random code (adjustment program), and narrowband interference frequencies which coincide with the frequencies of the signal.

The input mixture is fed to the input of unit 1, where it is filtered in the frequency band occupied by the signal with pseudorandom change the operating frequency. From the output of block 1 input mixture is supplied to the first signal, the input unit 2, the second reference input of which receives the reference signal 1 with pseudorandom change the operating frequency generated by the unit 6, the control inputs of which is pseudo-random code from the outputs of the block 5, which defines the law of frequency tuning unit 6.

In the result of multiplying the input signal with synchronous with him a reference signal is convolution of the input signal to an intermediate frequency.

The signal on the intermediate frequency is filtered in block 3 in the frequency band, consistent with duration, and is demodulated in block 4, the output of which is fed to the output device.

Narrowband interference at somehi, durationo.

The disadvantage of this device is the low immunity to narrowband interference.

To eliminate this drawback in the device for receiving signals, pseudo-random adjustment of the operating frequency, containing the first band-pass filter, whose input is an input of the generator of pseudo-random code, the n outputs of which are connected with the n control inputs tunable frequency synthesizer, and connected in series to the first multiplier, the second bandpass filter and demodulator whose output is the output of the device is entered serially connected second multiplier, a third band-pass filter, the unit impulse noise blanking, a third multiplier, a fourth band-pass filter and attenuator; connected in series, the first delay element, the first myCitadel, limiter, synchronous phase filter and the second myCitadel, the output of which is connected to the first signal input of the first multiplier; connected in series, the third delay element, the input connected to the output of the tunable frequency synthesizer and the second reference input of the second multiplier, and the fourth e is the delay elements is connected to a second, the reference input of the first multiplier. Entered the second delay element, the output of which is connected to the first input of the second vicites and the first signal input of the synchronous-phase filter. In this case, the output of the attenuator is connected to the second reference input of the first myCitadel. In addition, the output of the first bandpass filter connected to the first signal input of the second multiplier and to the first inputs of the first and second delay elements.

The structural scheme of the device is shown in Fig.2, where indicated: 1, 3, 8, 11 - first, second, third and fourth bandpass filters; 2, 7, 10 first, second and third multiplier products (faucets); 4 - demodulator; 5 - generator pseudo-random code;
6 - tunable frequency synthesizer;
9 is a block blanking (registrovani) impulse noise;
12 - attenuator;
13, 16, the first and second myCitadel;
14 - limiter;
15 - synchronous phase filter;
17, 18, 19 and 20 of the first, second, third and fourth delay elements.

The proposed device comprises a first band-pass filter 1, the inlet of which is an input device; sequentially connected to the second multiplier 7, the third band-pass filter 8, the unit impulse noise blanking 9, the third PE is acetates 13; connected in series generator pseudo-random code 5, n outputs of which is connected to the n control inputs tunable frequency synthesizer 6, the output of which is connected to the second reference input of the second multiplier 7 and the input of the third delay element 19, the output of which is connected to the second reference input of the third multiplier 10 and to the input of the fourth delay element 20, the output of which is connected to the second reference input of the first multiplier 2; connected in series, the first delay element 17, the first myCitadel 13, the limiter 14, the output of which is connected to the second reference input synchronous-phase filter 15, the output of which is connected to the second input of the second vicites 16, the first input connected to the output of the second delay element 18 and the first signal input of the synchronous-phase filter 15 and the output of the second vicites 16 is connected to series-connected first multiplier 2, the second band-pass filter 3 and a demodulator 4, the output of which is the output of the device; in addition, the first signal input of the second multiplier 7 and the inputs of the first and second delay elements 17 and 18 interconnected with the output of the first bandpass filter 1.

Th is al with pseudorandom change the operating frequency, representing a sequence of N radio pulses durationomodulated information whose carrier frequencies are changed by a given pseudo-random code (adjustment program), and narrowband interference frequencies which coincide with the frequencies of the signal. The input mixture is fed to the input of unit 1, where it is filtered in the frequency band occupied by the signal with pseudorandom change the operating frequency. From the output of block 1 input mixture is supplied to the first signal, the input unit 7, the second reference input of which a reference signal with pseudorandom change the operating frequency, synchronous with the input signal generated by the block 6. Block 7 is the multiplication of the input mixed with a reference signal.

The result of multiplying (mixing) of the input and reference signals is a sequence of N radio pulses durationothat intermediate (differential) frequency filtered by the block 8. Thus the bandwidth of the block 8F agreed with duration. At the same time, narrowband interference and frequency coincide with the position reference signal with pseudorandom change the operating frequency also turn into the radio, durationothat is also filtered by the block 8. The amplitude of the impulses of durationoformed from narrow-band interference at the output of block 8 greatly exceed the amplitude of the radio signal.

From the output of block 8 of the radio signal and the radio pulses generated from narrowband interference, proceed to block 9, where the Overscan of radio pulses, the amplitude of which significantly exceed the expected level of the useful signal. The Overscan is accomplished by locking the tract on the time during which the voltage at the input of block 9 exceeds the threshold value.

From the output of the block 9, the sequence of radio pulses from which are excluded the impulses caused by the influence of powerful narrowband interference, served on the first signal, the input unit 10, the second reference, the input of which is fed through the block 19 reference signal generated by the block 6. Program frequency tuning unit 6 is determined by the code sequence forming unit 5, which is supplied in parallel code with n outputs of block 5 on the n control inputs of the block 6.

The result of multiplying (mixing) radionu the term frequency in the block 11, bandwidth which is equal to the frequency band occupied by the input signal with pseudorandom change the operating frequency. The output of block 11 is the signal reconstructed signal with pseudorandom change the operating frequency, from which are excluded the radio, struck a powerful narrowband interference. The signal output unit 11 through the block 12 is supplied to the second input unit 13, where compensates for the signal in the input mixture fed to the first signal input unit 13 from the output of the block 1 through block 17.

The delay unit 17 is selected in the device configuration process so as to ensure alignment at the time of arrival of the signal with pseudo-random operating frequency tuning and evaluation unit 13.

The coefficient of transmission block 12 is selected in the device configuration process so as to ensure the alignment of the amplitudes of the input signal and its evaluation so as to ensure effective compensation signal at the output of block 13.

Due to the subtraction unit 13 from the input mixture of the evaluation signal at its output estimation of narrowband interference, which through the blocks 14 and 15 is supplied to the second input unit 16, the first input is pout, signal input unit 15.

In block 14 due to restrictions implemented rationing levels estimates of narrow-band interferences supplied to the second reference input unit 15, which is necessary for the permanence of his transfer ratio changing levels of narrowband interference on the input device.

At the same time due to limitations in the block 14 is the suppression of narrowband interference (selected at the output of block 13), the uncorrected unit 13 of the radio signal corresponding to the radio signal, which were orientirovany.

Thus the second reference input unit 15 is served normalized by the level of assessment of narrowband interference, and at first, its signal input the input mixture. The output unit 15 are only narrowband interference, so as soon as they are served on the second, the reference input, while their phase and amplitude coincide with the phases and amplitudes of the respective input noise of the mixture supplied to its first signal input, that is, the block 15 provides automatic adjustment of the amplitude and phase of the interference assessment under the amplitude and phase of the corresponding noise in the input mixture.

From the output of block 16 signal with pseudorandom change of working chastnogo served the reference signal with pseudorandom change the operating frequency from block 6 connected in series through the blocks 19 and 20. In unit 2 by multiplying (mixing) of the input and reference signals by convolution of the input signal with pseudorandom change the operating frequency in the sequence of radio pulses, which is the intermediate frequency is filtered by unit 3 and demodulated unit 4, the output of which is fed to the output device.

The block 15 may be performed as described in the monograph by C. M. Svistov "Radar signals and their processing", M., "Sov. radio", 1977, page 123.

Unit 17 provides the alignment in time of arrival of a signal and its estimation on the input unit 13.

Block 18 provides iraniana the arrival time of the narrowband interference and evaluation at the input unit 16.

Blocks 19 and 20 provide synchronization of the input and reference signals at the inputs of the blocks 7 and 2 respectively.

The magnitude of the delay units 18, 17, 19, 20 are selected in the device configuration process.

The block 7 may be performed as outlined in the monograph "mobile radio communications". /Edited by I. M. Pushkina. Moscow, Radio I Svyaz", 1986, page 190, Fig. 4.34.


Claims

A device for receiving signals with pseudorandom change the operating frequency, containing the first floor is connected with the n control inputs tunable frequency synthesizer, serially connected to the first multiplier, the second bandpass filter and demodulator whose output is the output of the device, characterized in that the introduced sequentially connected to the second multiplier, a third band-pass filter, the unit impulse noise blanking, a third multiplier, a fourth band-pass filter and attenuator, connected in series, the first delay element, the first myCitadel, limiter, synchronous phase filter and the second myCitadel, the output of which is connected to the first signal input of the first multiplier, connected in series, the third delay element, the input connected to the output of the tunable frequency synthesizer and the second reference input of the second multiplier, and the fourth delay element, the input of which is connected to a second reference input of the third multiplier and the output of the fourth delay element is connected to a second reference input of the first multiplier, introduced the second delay element, the output of which is connected to the first input of the second vicites and with the first signal input of the synchronous-phase filter, and the output of the attenuator is connected to a second reference input of the first myCitadel, in addition, the output of the first bands what about the elements of the delay.

 

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