RU148018U1 - INTERFERENCE WIDTH-BAND SEMI-DUPLEX RADIO COMMUNICATION STATION WITH NOISE-LIKE SIGNALS WITH EXPANSION OF THE SPECTRUM BY THE DIRECT SEQUENCE METHOD - Google Patents

Abstract

Interference-protected broadband half-duplex radio communication station with noise-free signals with direct-spread spectrum spreading, which contains a series-connected antenna, a switching and low-noise amplification device, a radio signal transceiver, a digital processing module, including a noise-like signal generator and a correlation digital receiver, as well as an electronic computer and a network adapter, characterized in that it contains a unit for calculating the received desync time a needle and a signal at the output of a noise-like signal generator, including a memory module connected to the processor of the electronic computer, a digital quadrature signal converter and a single-bit comparator, and the electronic computer provides initial initialization of the heterodyne signal sources of the transceiver and the programmable integrated circuit of the digital signal processing module, in initial synchronization mode calculates the inter-correlation function of the signal from the output of the transceiver after e about analog-to-digital conversion in the digital signal processing module with a reference signal, determining the signal delay value relative to the beginning of the pseudo-random sequence from the position of the maximum of the inter-correlation function relative to the recording start, carried out in the digital processing module, and transmitting it to the broadband signal generator of the digital processing module, in the mode the reception registers the signals of the correlation digital receiver in the memory module and determines the values for

Description

The present utility model relates to communications, namely, to an interference-protected broadband half-duplex radio communication station with noise-free signals and spreading of the spectrum by the direct sequence method.

A mobile duplex radio communication device is known RU 81022 U1, H04B 7/12 (2006.01) H04K 1/00 (2006.01), comprising an antenna connected via a microwave switch to a transmitter and a receiver of broadband radio signals, respectively connected via modulating and demodulating inputs to the output of a noise-like generator signals, the first control input of which by the time delay of demodulation through the tracking unit is connected to the output of the receiver of broadband radio signals and the input of the recording unit of the incoming information, characterized in that it additionally contains a GPS signal receiver connected in series, a unit for calculating the propagation time of radio signals to the base station, a temporary scanning device and an electronic switch, the output of which is connected to the second control input of the noise-like signal generator, and the control input of the switch according to the presence of a capture signal for auto-tracking of the information signal - with a signal the output of the tracking unit.

The disadvantages of the known device are:

increased time of entering into radio communication with the base radio station, due to the need to clarify the delay value, calculated on the basis of data from the GPS receiver, by using iterative delay adjustment algorithms in the scanning device based on the analysis of the signal level at the receiver output;

- the dependence of the health of the device on the health of a third-party system.

The objective of the utility model is to ensure the operability of a communication station, regardless of the operability of third-party systems and to ensure a minimum time for entering into communication.

The technical result of the utility model is to reduce the half-duplex radio communication establishment time by accurately calculating the timing of the received signal and the signal at the output of the noise-like signal generator without using global positioning tools.

The achievement of the claimed technical result, and as a result, the solution of the technical problem is ensured by the fact that the noise-proof broadband half-duplex radio communication station with noise-free signals with spectrum spreading using the direct sequence method contains a series-connected antenna, a switching and low-noise amplification device, a radio signal transceiver, a digital processing module, including a noise-like signal generator and a correlation digital receiver, as well as an electro but computers and the network adapter. The station is characterized in that it contains a unit for calculating the time of the synchronization of the received signal and the signal at the output of the noise-like signal generator, including a memory module associated with the processor of the electronic computer, a digital quadrature signal converter and a single-bit comparator.

The utility model is illustrated in the drawing (Fig. 1).

A radio communication station comprises an antenna 1 connected through a switching device and low noise amplification 2 with a radio transceiver 3. The input of the radio transceiver 3 is connected to the output of the noise-like signal generator 5 from the digital processing module 4. The output of the radio transceiver 3 is connected to the input of the correlation digital receiver 7 from the digital processing module 4.

The digital processing module and the transceiver at the control inputs are connected to an electronic computer (computer) 8, which through a network adapter 10 can be connected to an external control device.

The unit for calculating the time of the desync of the received signal and the signal at the output of the noise-like signal generator consists of a memory module associated with the processor of the electronic computer. The unit provides registration of the received signal from the output of a one-bit comparator and calculation of the delay value according to the data of the registered signal.

The generator 5 is made in a programmable logic integrated circuit (FPGA) for forming a pseudo-random sequence of rectangular, phase-code-manipulated pulses. One of the generator outputs (connected to a correlation digital receiver) provides the ability to track the time delay of radio signals.

The correlation digital receiver is made in the FPGA in the form of a multiplier of the signals of the transceiver 3 and generator 5, the output of which is connected to three stages of digital filters.

The output of the correlation digital receiver is connected to a computer.

The output signal of the correlation digital receiver is recorded in the computer memory and processed by special software (STR) 9.

The introduction of a unit for calculating the time of desynchronization of the received signal and the signal at the output of the noise-like signal generator, made in the form of a memory module associated with the processor of the electronic computer and providing an accurate calculation of their cross-correlation function using the fast convolution method based on the fast Fourier transform (FFT), allows get in touch with the base station without using a GPS signal receiver and iterative methods for refining the calculated delay. This additionally reduces the time spent on getting into communication, ensures the independence of the station’s operability from the operability of third-party tools, and ensures the solution of the technical task.

In FIG. 1 is a functional diagram of a radio communication station with noise-free signals with spreading of the spectrum by the direct sequence method.

A radio communication station comprises an antenna 1 connected through a switching device and low noise amplification 2 with a radio transceiver 3. The input of the radio transceiver 3 is connected to the output of the noise-like signal generator 5 from the digital processing module 4. The output of the radio transceiver 3 is connected to the input of the correlation digital receiver 7 from the digital processing module 4.

A radio communication station with noise-free signals with spreading of the spectrum by the direct sequence method works as follows.

When the station is turned on, the computer operating system 8 is loaded and the station management program from the STR is launched. The control program initializes the sources of the heterodyne signal (not shown in the diagram) of the transceiver 3, FPGA (not shown in the diagram) of the digital signal processing module 4.

In the transmission mode, the transmitted data is transmitted from a computer to a digital processing module in which the transmitted data is modulated by a digital pseudo-random sequence generated by a noise-like signal generator 5. From the generator output, a digital pseudo-random sequence is fed to the input of the transceiver 3 in which its spectral characteristics are transferred to the carrier frequency and transmission of the resulting signal to the input of the switching device and low noise amplification (UKMShU). In UKMShU the signal is amplified to the required level and enters the antenna, which carries out its radiation into space.

In the reception mode, the signal received by the antenna is fed to the input of the MCU, in which it is amplified. From the output of the UKMShU, the signal is fed to the input of the transceiver in which it is quadrature transferred to zero frequency. From the output of the transceiver, the quadrature signal enters the correlation digital receiver of the digital signal processing module, where its analog-to-digital conversion and correlation reception are performed. Three signals are generated at the output of the correlation digital receiver, which are the results of the correlation reception of the signal with three pseudorandom reference sequences delayed relative to each other, and then transferred to the computer memory where they are processed by the station control program. The station control program determines the settings for the signal delay value at the output of the noise-like signal generator from the ratio of signal levels in the three received channels. One of the three received signals having a maximum level is demodulated by a software demodulator and decoded.

In the initial synchronization mode, the signal received by the antenna is input to the UKMShU, in which it is amplified. From the output of the UKMShU, the signal is fed to the input of the transceiver in which it is quadrature transferred to zero frequency. From the output of the transceiver, the quadrature signal enters the digital signal processing module where it is analog-to-digital converted, registered (the moment the registration begins coincides with the moment the pseudorandom sequence generated by the broadband signal generator begins) and transmitted to the computer memory, where it is processed by the station control program by calculating its cross-correlation functions with a reference signal by the method of fast convolution using FFT. The position of the maximum of the cross-correlation function relative to the beginning of the registration determines the signal delay value relative to the beginning of the pseudo-random sequence, the corresponding command of the delay value is received from the computer to the broadband signal generator of the digital signal processing module, and the station enters the reception mode.

Claims (1)

Interference-protected broadband half-duplex radio communication station with noise-free signals with direct-spread spectrum spreading, which contains a series-connected antenna, a switching and low-noise amplification device, a radio signal transceiver, a digital processing module, including a noise-like signal generator and a correlation digital receiver, as well as an electronic computer and a network adapter, characterized in that it contains a unit for calculating the received desync time a needle and a signal at the output of a noise-like signal generator, including a memory module connected to the processor of the electronic computer, a digital quadrature signal converter and a single-bit comparator, and the electronic computer provides initial initialization of the heterodyne signal sources of the transceiver and the programmable integrated circuit of the digital signal processing module, in initial synchronization mode calculates the inter-correlation function of the signal from the output of the transceiver after e about analog-to-digital conversion in the digital signal processing module with a reference signal, determining the signal delay value relative to the beginning of the pseudo-random sequence from the position of the maximum of the inter-correlation function relative to the recording start, carried out in the digital processing module, and transmitting it to the broadband signal generator of the digital processing module, in the mode the reception registers the signals of the correlation digital receiver in the memory module and determines the values for signal holding at the output of the noise-like signal generator.

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