SU873452A1 - Frequency-phase manipulated signal receiving device - Google Patents

Description

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The invention relates to radio and can be used in communication systems with frequency-phase shift signals.

A device for receiving frequency-phase-shift keyed signals is known, comprising a series-connected first blender and a first band-pass filter, a search and synchronization unit, the output of which is connected to the input of a pseudo-random sequence generator, the outputs of which are connected to the corresponding inputs of the search and synchronization unit, the decoder and the first input of the multiplier, the second the input and output of which are connected respectively to the first input of the first displacer. and the first input of the second displacer, the output of which through the second hollow filter is connected to the second input of the first displacer, while the decoder output is connected to the first one. tl3 software block input.

However, the known device with a large number of frequency jumps of the signal becomes cumbersome due to the large number of band-pass filters, which is equal to the number of frequency jumps. In addition, with a large number of fIa-

It is difficult to keep their parameters constant over time.

The purpose of the invention is to simplify the device by eliminating hetero-. dyne, switch and narrowband filter unit.

The goal is achieved by the fact that, in a device for receiving frequency-phase-controlled signals, containing 10 serially connected first blender and first bandpass filter, a search and synchronization unit whose output is connected to the input of a pseudo-random sequence generator, whose outputs are connected to the corresponding inputs of the search and synchronization unit , the decoder and the first input of the multiplier, the second input and output of which are connected

20, respectively, with the first input of the first offset and the first input of the second offset, whose output through the second bandpass filter is connected to the second input of the first one, displace 25 liters, while the output of the decoder is connected to the first input of the program block, a frequency synthesizer and the third blender connected in series are entered whose output is connected to

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the signal input of the search and synchronization unit, the auxiliary output of which is connected to the second input of the program block, the output of which is connected to the input of the frequency synthesizer, the output of which is connected to the second input, the second offset and the first input of the third offset, to the second input of which the output of the first band filter is connected.

The drawing shows a structural electrical: scheme of the proposed device.

The device contains a displacer 1, a band-pass filter 2, a displacer. 3, a band-pass filter 4, a search and synchronization unit 5, a pseudo-random sequence generator (PSP), a multiplier 7, a displacer 8, a band-pass filter 9, a frequency synthesizer 10, a program block 11 and a decoder 12.

The device works in the following way.

The device receives a high-frequency signal, which is a vibration, the phase of which is manipulated by 0.180 according to the law of the memory bandwidth, and the carrier frequency varies in steps. The law of another PSP is synchronous with the first PSP. Before starting the reception of a signal from a frequency synthesizer 10, a heterodyning signal is applied to the mixer 8, the frequency and phase of which is constant. In block 5, a search is performed for the time delay of the SRP. At the moment of coincidence in the time delay of the memory bandwidth of the received signal and the reference memory bandwidth, at the output of the multiplier 7, a signal without phase shift keying is generated, containing only frequency jumps. This signal is converted by an offset device 8 into an intermediate frequency signal. If the number of the frequency jump of the received signal corresponds to the frequency of the heterodyning signal applied to the second input of the offset 8, then the intermediate time signal% ft f, passes through

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band-pass filter 9 to the second input of the displacer 1, resulting in a phase-shift keyed signal at a frequency fj; + .ffip through a band-pass filter 2 is fed to the input of the offset 3, to the second input of which a frequency signal f is fed from the synthesizer 10 frequencies. Band-pass filter 4 is tuned to frequency. 2ff, p 2 (f, - fg) The signal of this frequency is fed to block 5, in which the signal is captured. The output of block 5 sends a signal to program block 11 to begin switching frequencies of the synthesizer 10 in time with the frequency jumps of the received signal. The switching times are determined by pulses from the output of the decoder 12 supplied to block 11. These pulses are generated

at the end of each period, the SRP, which determines the law of phase signal manipulation. At block 5, from the outputs of the n-th and (nl) -ro stages of the generator 6 of the bandwidth bandwidth, the reference synchronization bandwidth cdspl is supplied, and to the second input of the multiplier 7, the memory bandwidth is delayed relative to the sequence from the output (p-1) of the cascade for half the duration cap symbol. .

The elimination of the influence of the phase shift of the received signal resulting from transmission at different frequencies occurs as a result of the fact that signals from the same input phase 1 are with the same phase shift: the first signal directly from the device input, the second signal through the multiplier 7, the offset device 8 and the band pass signal filter 9. Thus, the output signal of the displacer 1 does not have parasitic phase shift keying in frequency hopping, which makes it possible to reduce signal loss during reception and, therefore, will increase the accuracy of for the received signal. The use of a frequency synthesizer 10 and a band-pass filter 9 instead of a set of band-pass filters and a switch used in a known device simplifies the circuitry of the device, which is noticeable when receiving signals with a large number of frequency jumps.

Claims (1)

1. USSR author's certificate No. 708531. cl. H 04 L 27/14, 1978 (prototype).