Radio receiver

 

The invention relates to radio engineering. The technical result is to reduce the probability of missing signals due to a faulty receiver tract. The invention consists in that in the known device, containing preselector, block frequency conversion, the block main selectivity, demodulator, frequency synthesizer, the block adjustment tract, block software control unit interfaces and the control unit is additionally introduced a switch and a dummy. The use of the proposed circuit designs allows you to continuously monitor the health of a receiving device. 1 Il.

The invention relates to electrical engineering and can be used in the communication links. Decreases the probability of missing signals due to a faulty receiver paths.

A characteristic feature of receiving devices is a passive mode of operation when the signal is not known, and its duration is small. In this case, the malfunction of the intake tract can lead to missed signals, and therefore has great importance to the problem of rapid fault detection of a receive path. In [1] Priaulx. It is also noted that while reducing the time intervals between the control operations and the availability of backup equipment probability increases and approaches unity for continuous monitoring. However, proposed in [1] solution for monitoring the health of the radio using exciter transmitter has the following disadvantages: requires significant material costs for the organization of such control, it is possible to defeat a powerful signal of the exciter adjacent receiving channels, which at this point, the information received by the other radio communication equipment, and the failure of the pathogen.

Known radio receiver [2], containing the preselector, block frequency conversion, the block main selectivity, demodulator, frequency synthesizer, the power adjustment channel, control unit, block programme management and block interfaces. A disadvantage of the known device is that the control is carried out on the received signal, i.e. in the absence of the useful signal monitoring of the condition of the radio is not possible.

The objective of the invention is eliminate the possible loss of information due to the skip signal when a malfunction of the intake tract. Put the, the unit of frequency conversion, the block main selectivity and the demodulator, and the frequency synthesizer, the block adjustment tract, block software control unit interfaces, and a control unit containing a detector connected in series, the input of which is the input of the control unit, and an analog-to-digital Converter whose output is the output of the control unit, and the output of the frequency synthesizer connected to heterodyne the input unit of frequency conversion, the outputs of block adjustment path are connected with the inputs of the setting of the preselector, block frequency conversion unit selectively to the output of the main unit selectively connected to the input of the control unit, unit software control via control bus connected to the control inputs of the preselector unit selectivity, demodulator, frequency synthesizer, a power adjustment circuit and the output of the control unit, on a separate bus unit software control is connected to the block interfaces, put the switch and the equivalent antenna, and one input of the switch is input receiving unit and the second input switch connected to the dummy, the output switch connected to the input of the preselector.

On corteggiani preselector 1, unit 2 frequency conversion, unit 3 main selectivity and the demodulator 4, and the synthesizer 5 frequency, block 6 regulation tract, block 7 program control unit 8 interfaces and the control unit 9 containing connected in series detector 10 effective value of the signal input which is the input of the control unit, and an analog-to-digital Converter whose output is the output of the control unit, and the output of the synthesizer 5 frequency connected to heterodyne the input unit 2 frequency conversion, the output unit 6 of the control path connected to the inputs adjust the preselector 1, unit 2 frequency conversion unit 3 main selectivity, the output unit 3 main selectively connected to the input of the control unit 9, block 7 software control via control bus connected to the control inputs of the preselector 1, unit 3 main selectivity, the demodulator 4, synthesizer 5 frequency, block 6 adjustment circuit and to the output of the control unit 9, on separate bus unit 7 software control is connected to the unit 8 interfaces, and the switch 12 and the equivalent of 13 antenna, and one input of the switch 12 is input receiving device, and the second input of the switch 12 is connected with what follows: when a receiving device, unit 7 software control includes control mode, a receiving device, and the entrance of the preselector 1 through the switch 12 is connected to the equivalent of 13 antenna, the block 6 adjustment path sets the path maximum transfer rate, and the output of block 3 of the main selectivity appear intrinsic noise of the radio operating frequency band, which is fed to the input of the control unit 9, it is detected by detector 10 effective value of the signal using analog-to-digital Converter 11 is converted into a digital value proportional to the noise level a receiving device in the operating frequency band with a maximum transfer rate of the intake tract. This value is fed to the block 7 software management, where remembered. This operation is repeated for all the allowed frequencies stored in the memory unit 7 software control. Then the receiver device using the block 7 program control is transferred to an operating mode, it is input through the switch 12 is connected to the input of the preselector 1, preselector 1 and synthesizer 5 frequency command control unit 7 software configured to control one of represenatative frequency and the unit 3 main selectivity, to the input of the control unit 9. It is detected by the detector 10 effective value of the signal using analog-to-digital Converter 11 is converted into a digital value proportional to the sum of signal and noise at the input of the radio receiver with antenna. This value is also fed to a block 7 software management, which is compared with the previously recorded value corresponding to the control mode taking into account entered in the receiving path of adjustment of the gear ratio, the details of which are received in block 7 software control unit 6 regulation tract. As shown in [3], even under calm atmospheric conditions, the level of atmospheric and galactic noise in the short wavelength range of not less than three times the noise level a receiving device. Therefore, if the received block 9 of the control unit 7 software control the effective value of the sum of signal and noise in the operating mode and the effective value of noise receiving device in a control mode differ less than three times, the decision on the failure receiving device, and the command of the fault through the block 8 interfaces post is istwa. Thus, health monitoring, a receiving device is carried out continuously without disrupting radio communications.

Sources of information

1. Sartakov N. A., Edany C. M., Gribin Century Century main Shortwave radio receiver. - M.: Communication, 1971.

2. A receiving device. Patent No. 2080739, 27.05.97, BI, 15.

3. World Distribution and Characteristics of Atmospheric Radio Noise. Report 322 CCIR, Geneva, 19693.

Claims

A receiving device that contains one United preselector, block frequency conversion, the block main selectivity and the demodulator, and the frequency synthesizer, the block adjustment tract, block software control unit interfaces, and a control unit containing a detector connected in series, the input of which is the input of the control unit, and an analog-to-digital Converter whose output is the output of the control unit, and the output of the frequency synthesizer connected to heterodyne the input unit of frequency conversion, the outputs of block adjustment path are connected with the inputs of the setting of the preselector, block frequency conversion and block selectivity, to the output of the main unit selectively connected to the input of the control unit, the STI block, demodulator, frequency synthesizer, a power adjustment circuit and the output of the control unit, on a separate bus unit software control is connected to the block interfaces, characterized in that it introduced a switch and a dummy, and one input of the switch is input receiving unit and the second input switch connected to the dummy, the output switch connected to the input of the preselector.

 

Same patents:

The invention relates to a communication system

The invention relates to a method of controlling the transmission associated with temperature, in Radiocommunication systems

The invention relates to the field of radio communications and computer engineering and can be used to transfer information to the computer network radio

The invention relates to automatic control systems for organizing links in the trunk interfaces for signaling code Manchester-2"

The invention relates to the field of radio and can be used in communication systems with broadband signals

The invention relates to the field of telecommunications and computer technology, in particular to methods and devices for data transmission in the computer network by radio with pseudorandom change the operating frequency

The invention relates to the field of discrete information transmission and can be used in radio channels to transmit information in space and terrestrial communication systems using pseudonoise signals

The invention relates to radio engineering

FIELD: radio engineering; construction of radio communication, radio navigation, and control systems using broadband signals.

SUBSTANCE: proposed device depends for its operation on comparison of read-out signal with two thresholds, probability of exceeding these thresholds being enhanced during search interval with the result that search is continued. This broadband signal search device has linear part 1, matched filter 2, clock generator 19, channel selection control unit 13, inverter 12, fourth adder 15, two detectors 8, 17, two threshold comparison units 9, 18, NOT gates 16, as well as AND gate 14. Matched filter has pre-filter 3, delay line 4, n attenuators, n phase shifters, and three adders 7, 10, 11.

EFFECT: enhanced noise immunity under structural noise impact.

1 cl, 3 dwg

FIELD: radio engineering for radio communications and radar systems.

SUBSTANCE: proposed automatically tunable band filter has series-connected limiting amplifier 1, tunable band filter 2 in the form of first series-tuned circuit with capacitor whose value varies depending on voltage applied to control input, first buffer amplifier 3, parametric correcting unit 4 in the form of second series-tuned circuit incorporating variable capacitor, second buffer amplifier 5, first differential unit 6, first amplitude detector 7, first integrating device 9, and subtraction unit 9. Inverting input of subtraction unit 9 is connected to reference-voltage generator 10 and output, to control input of variable capacitors 2 and 4. Automatically tunable band filter also has series-connected second amplitude detector 11, second integrating unit 12, and threshold unit 13. Synchronous operation of this filter during reception and processing of finite-length radio pulses is ensured by synchronizer 14 whose output is connected to units 10, 8, and 12. This automatically tunable band filter also has second differential unit whose input is connected to output of buffer amplifier 3 and output, to second control input of variable capacitor of band filter 2.

EFFECT: enhanced noise immunity due to maintaining device characteristics within wide frequency range.

1 cl, 1 dwg

FIELD: radio communications engineering; mobile ground- and satellite-based communication systems.

SUBSTANCE: proposed modulator that incorporates provision for operation in single-channel mode with selected frequency modulation index m = 0.5 or m = 1.5, or in dual-channel mode at minimal frequency shift and without open-phase fault has phase-shifting voltage analyzer 1, continuous periodic signal train and clock train shaping unit 2, control voltage shaping unit 3 for switch unit 3, switch unit 3, switch unit 4, two amplitude-phase modulators 5, 6, phase shifter 7, carrier oscillator 8, and adder 9.

EFFECT: enlarged functional capabilities.

1 cl, 15 dwg

FIELD: electronic engineering.

SUBSTANCE: device has data processing circuit, transmitter, commutation unit, endec, receiver, computation unit, and control unit.

EFFECT: high reliability in transmitting data via radio channel.

4 dwg

FIELD: electronic engineering.

SUBSTANCE: method involves building unipolar pulses on each current modulating continuous information signal reading of or on each pulse or some continuous pulse sequence of modulating continuous information code group. The number of pulses, their duration, amplitude and time relations are selected from permissible approximation error of given spectral value and formed sequence parameters are modulated.

EFFECT: reduced inetrsymbol interference; high data transmission speed.

16 cl, 8 dwg

FIELD: communication system transceivers.

SUBSTANCE: transceiver 80 has digital circuit 86 for converting modulating signals into intermediate-frequency ones. Signal source 114 transmits first periodic reference signal 112 at first frequency. Direct digital synthesizer 84 receives second periodic signal 102 at second frequency from first periodic reference signal. Converter circuit affording frequency increase in digital form functions to convert and raise frequency of modulating signals into intermediate-frequency digital signals using second periodic signal 102. Digital-to-analog converter 82 converts intermediate-frequency digital signals into intermediate-frequency analog signals using first periodic reference signal 112.

EFFECT: reduced power requirement at low noise characteristics.

45 cl, 3 dwg

FIELD: radio engineering; portable composite phase-keyed signal receivers.

SUBSTANCE: proposed receiver has multiplier 4, band filter 6, demodulator 8, weighting coefficient unit 5, adding unit 7, analyzing and control unit 10, synchronizing unit 3, n pseudorandom sequence generators 21 through 2n, decoder 1, and switch unit 9. Receiver also has narrow-band noise suppression unit made in the form of transversal filter. Novelty is that this unit is transferred to correlator reference signal channel, reference signal being stationary periodic signal acting in absence of noise and having unmodulated harmonic components that can be rejected by filters of simpler design than those used for rejecting frequency band of input signal and noise mixture. Group of synchronized pseudorandom sequence generators used instead of delay line does not need in-service tuning.

EFFECT: facilitated realization of narrow-band noise suppression unit; simplified design of rejection filters.

1 cl, 8 dwg

FIELD: mobile radio communication systems.

SUBSTANCE: proposed method and device are intended to control transmission power levels for plurality of various data streams transferred from at least one base station to mobile one in mobile radio communication system. First and second data streams are transmitted from base station and received by mobile station. Power-control instruction stream is generated in mobile station in compliance with first or second data stream received. Power control signal is shaped in mobile station from first power control instruction stream and transferred to base station. Received power control instruction stream is produced from power control signal received by base station; power transmission levels of first and second data streams coming from base station are controlled in compliance with power control instruction stream received. In this way control is effected of transmission power levels of first data stream transferred from each base station out of first active set to mobile station and of transmission power levels of second data stream which is transferred from each base station out of second active set to mobile station.

EFFECT: enlarged functional capabilities.

80 cl, 21 dwg

FIELD: radio engineering.

SUBSTANCE: proposed method and device designed for fast synchronization of signal in wade-band code-division multiple access (WCDMA) system involve use of accumulations of variable-length samples, testing of decoder estimates for reliability, and concurrent decoding of plurality of sync signals in PERCH channel. Receiver accumulates samples required for reliable estimation of time interval synchronization. As long as time interval synchronization estimates have not passed reliability tests, samples are accumulated for frame synchronization estimates. As long as frame synchronization estimates have not passed reliability tests, samples are analyzed to determine channel pilot signal shift.

EFFECT: reduced time for pulling into synchronism.

13 cl, 9 dwg

FIELD: satellite navigation systems and may be used at construction of imitators of signals of satellite navigational system GLONASS and pseudo-satellites.

SUBSTANCE: for this purpose two oscillators of a lettered frequency and of a fixed frequency are used. Mode includes successive fulfillment of the following operations - generation of a stabilized lettered frequency, its multiplication with an oscillator's fixed frequency and filtration of lateral multipliers with means of filters of L1 and L2 ranges and corresponding option of a fixed and a lettered frequencies.

EFFECT: reduces phase noise and ensures synthesizing of lettered frequencies of L1 and L2 ranges of satellite navigational system from one supporting generator at minimum number of analogous super high frequency units.

3 cl, 1 dwg

Up!