RU190736U1 - TRANSMITTER FOR HIGH-FREQUENCY SIGNAL TRANSFER - Google Patents

Abstract

The utility model relates to radio engineering and can be used in a mobile radio measuring complex for measuring the parameters of radio signals in a space containing an unmanned aerial system (UAS) and in various methods of conducting flight inspections of ground-based radio-technical flight support facilities (such as ILS, VOR, DME, Marker, NDB, RDF, lighting equipment and others) and flight radio measurements in space using at least one BAS.Technical result is to increase the reliability of signal transmission . To ensure the achievement of this technical result, a transmitter for transmitting an RF signal is configured to generate an RF signal by direct digital synthesis, wherein the signal is modulated by multiplying in digital form the amplitude of the carrier frequency by the modulation signal. 1 bp, 1 ill.

Description

TECHNICAL FIELD

The utility model relates to radio engineering and can be used in a mobile radio-measuring complex for measuring parameters of radio signals in space containing an unmanned aircraft system (BAS) and in various methods of conducting flight tests of ground-based radio equipment for flight operations (such as ILS, VOR, DME, Marker, NDB, RDF, lighting equipment, etc.) and flight radio measurements in space using at least one UAS.

BACKGROUND

The prior art transmitting device (patent RU 2282944 "Methods and devices for transmitting and receiving information, MPKH04L 27/10, publ. 08/27/2006 is a prototype) for transmitting a high-frequency (RF) signal, containing a generator for generating carrier waves, with at least one continuous and smooth frequency change, which is a carrier sweep, a modulator for generating or coding an information signal, a mixing device for modulating a carrier wave with an information signal and a transmitting transducer connected to it The transmitter, as well as, if necessary, a filtering device, connected between the mixing device and the transmitting transducer, made in the form of a bandpass filter, a control module for controlling the shape, height, time sequence of carrier sweeps and / or modulation of the information signal.

The disadvantages of this technical solution are: the need to change the frequency at a given time interval, filtering the transmitted signal after reception in the frequency domain.

DISCLOSURE OF USEFUL MODEL

The technical result of the proposed utility model is aimed at improving the reliability of signal transmission in the mobile radio-measuring complex.

To ensure the achievement of this technical result, a transmitter has been developed for transmitting an RF signal, configured to generate an RF signal by direct digital synthesis, and contains a central processor, configured to control the carrier frequency of a digital synthesizer (DDS), as well as generate modulating signals; digital synthesizer (DDS), consisting of series-connected: block generating signal carrier frequency; amplitude, frequency and phase modulator; and a digital-to-analog converter (DAC), with the input of the carrier frequency signal conditioning unit connected to the output of the central processor; filter low pass filter, the input of which is connected to the output of the DAC; the signal amplifier, whose inputs are connected to the central processor and the low-pass filter, and output to the transmitter antenna via an attenuator controlled by the central processor, the signal being modulated by digitally multiplying the amplitude of the carrier frequency by the modulation signal, while modulating the signal by the formula:

, где

where

- модулированный сигнал,

- modulated signal

- закон модуляции,

- the law of modulation,

- номер отсчета,

- reference number

- интервал дискретизации отсчетов несущей частоты,

- sampling interval of samples of the carrier frequency,

- интервал дискретизации отсчетов модулирующего сигнала,

- sampling interval of samples of the modulating signal,

- частота несущей.

- carrier frequency.

Also, the technical result is achieved by the modulation of the signal, depending on the specified modulation law, the reference number, the sampling interval of the carrier frequency samples and the sampling interval of the modulating signal samples.

Also, the technical result is achieved by the fact that the transmitter is additionally configured to filter the amplitude analog spectrum of the modulated signal.

BRIEF DESCRIPTION OF THE DRAWINGS

The essence of the useful model is explained in the attached graphic material, where an example of the technical scheme of the transmitter is presented.

IMPLEMENTATION OF THE USEFUL MODEL

As is known (RU2501031, RU2282944), a mobile radio-measuring complex for measuring parameters of radio signals in space contains an unmanned aircraft system (BAS), which is equipped with a transmitter and receivers for transmitting and receiving an RF signal. To conduct flight testing of ground-based radio equipment for flight operations, such as ILS, VOR, DME, Marker, NDB, RDF, lighting equipment, etc., and conduct flight radio measurements in space, the UAS operator sets the flight route.

A UAS can perform a flight along a given route in an automated mode for conducting flight inspection and flight radio measurements, or the operator can manually perform a UAS flight control along a given route.

To test the receivers that are part of the ground-based radio equipment for flight operations, UAS is equipped with an appropriate transmitter for transmitting the RF signal.

In order to increase the reliability of signal transmission from the UAS transmitter to the ground flight radio equipment receivers, the transmitter is configured to generate an RF signal using direct digital synthesis, the signal being modulated by multiplying in digital form the amplitude of the carrier frequency by the modulation signal.

To ensure this possibility, the transmitter, in the particular case of its implementation, in accordance with the example shown in FIG. amplitude, frequency and phase modulator 2.2; and a digital-to-analog converter 2.3 (D / A converter), with the input of the carrier frequency signal generating unit 2.1 connected to the output of the central processor 1; low pass filter 3 (LPF), the input of which is connected to the output of the DAC 2.3; signal amplifier 4, the inputs of which are connected to the central processor 1 and the low-pass filter 3, and output to the transmitter antenna via an attenuator 5 controlled by the central processor 1; a clock pulse generator 6, connected to the central processor 1, the block 2.1 of the signal generation of the carrier and the DAC 2.3; and keyboard 1 connected to the central processor 1, indicator 8, USB 9 unit, data storage unit 10, power supervisor 11 (PowerSupervisor).

The transmitter elements can be powered by means of a voltage stabilizer shown in FIG. 1. The voltage stabilizer forms the supply voltages of all transmitter nodes, in combination with the power supervisor 11 (PowerSupervisor) stabilizer, certain sequences of supply and discharge of the supply voltages are formed when switching on and off, as well as device reset signals

The central processor 1, in accordance with a predetermined flight test program, of the receivers of ground-based radio equipment for flight operations, sends commands of 2.1 blocks to generate a carrier frequency signal in accordance with the parameters specified by the program. The generated carrier signal is then fed to an amplitude, frequency, and phase modulator 2.2, which is designed to modulate the signal by multiplying in digital form the amplitude of the carrier frequency by the modulation signal. The parameters of the modulation signal to the specified modulator 2.2 are received from the central processor 1.

, где The modulation of the signal by the modulator 2.2 is carried out according to the formula:

where

- модулированный сигнал,

- modulated signal

- закон модуляции,

- the law of modulation,

- номер отсчета,

- reference number

- интервал дискретизации отсчетов несущей частоты,

- sampling interval of samples of the carrier frequency,

- интервал дискретизации отсчетов модулирующего сигнала,

- sampling interval of samples of the modulating signal,

- частота несущей.

- carrier frequency.

Next, the modulated signal is fed to the DAC 2.3, where it is converted into an amplitude analog spectrum. Synchronization in the work of the central processor, block 2.1 signal carrier and DAC 2.3 is provided by means of a clock pulse generator 6. To filter the amplitude analog spectrum of the modulated signal and suppress frequencies above the main Nyquist zone, the low-pass filter 3 is used. The formed and filtered signal is fed to an adjustable amplifier signal 4. By using the gain control performed by the central processor in accordance with a given program, the initial value is set to output on signal when calibrating. Attenuator is used to set the desired output level. The resolution is 0.5 dB. The RF signal processed by the attenuator is fed to the transmitter output.

The generated HF signal is registered by the receivers of ground-based radio equipment for flight operations, processed by a computing system to determine the parameters of the received HF signal. The obtained parameters of the RF signal are compared with the reference values of the parameters and a decision is made on the status of the receivers of ground-based radio flight support equipment.

Thus, since the RF signal is generated by direct digital synthesis, which provides the most accurate signal synthesis, and the signal modulation is performed by multiplying in digital form the carrier frequency amplitude by the modulation signal, the claimed device does not require additional filters and signal amplifiers, which simplifies the design and increases the reliability of transmission of signals from both the transmitter and the mobile radio-measuring complex, in which this transmitter is used.

Claims (8)

1. A transmitter for transmitting a high-frequency signal, configured to generate a high-frequency signal by direct digital synthesis, and containing a central processor, configured to control the carrier frequency of the digital synthesizer, as well as generate modulating signals; digital synthesizer, consisting of series-connected: block generating the signal of the carrier frequency; amplitude, frequency and phase modulator; and a digital-to-analog converter, with the input of the carrier signal conditioning unit connected to the output of the central processor; a low-pass filter whose input is connected to the output of a digital-to-analog converter; the signal amplifier, whose inputs are connected to the central processor and low pass filter, and the output to the transmitter antenna through an attenuator controlled by the central processor, the signal being modulated by digitally multiplying the carrier frequency amplitude by the modulation signal, while modulating the signal by the formula :

where

- modulated signal

- the law of modulation,

- reference number

- sampling interval of samples of the carrier frequency,

- sampling interval of samples of the modulating signal,

- carrier frequency.

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