The method of controlling the quality of the lo signal multiband superheterodyne radio receiver

 

(57) Abstract:

The invention relates to electrical engineering and can be used in control systems of health multichannel receivers, local oscillators are tunable synthesizers frequency (MF), check the basic parametrov lo - inaccuracies of tuning frequency and level of spurious components in the spectrum of the lo signal. The purpose of the present invention provide control of the basic parameters of lo - inaccuracies of tuning frequency and level of spurious components in the spectrum of the lo signal for multi-channel RP. The method of controlling the quality of the lo signal multiband superheterodyne radio receiver, which serves a control signal to the input of the controlled channel radio (PKK), configure the PKK controlled by control signal to change the frequency settings of SPM in both directions from the frequency of the control signal determines the frequency of side receiving channels is the fact that one of the PKK, namely the first, is used as the analyzing, the output signal of the inverter controlled by the PKK transform frequency in the working frequency band of a multiband radio frequency converted signal from step equal to the smallest integer greater than the quotient of dividing the band of the converted signal by the number of points of the settings displayed on the indicator, for each frequency settings relieve samples of the amplitude of the signal, considering them samples of the amplitudes of the spectral components of the local oscillator, display of the amplitude of spectral components, placing them sequentially in descending order or ascending frequency, determines the frequency and amplitude of the main response of the output signal controlled by the PKK, determine the amplitude response spurious signal components at the output of the controlled PKK, determine the ratio of the amplitudes of the primary response and side components and compares the ratio with a threshold, by comparing the results, draw conclusions about the health of the local oscillator according to the criterion of the level of spurious components, compare the frequency of the main response of the output signal of the controlled PKK with known and by comparing the results, draw conclusions about the health of the local oscillator according to the criterion of accuracy frequency setting. 5 Il.

The invention relates to electrical engineering and can be used in control systems of health novocane check the basic settings of lo - inaccuracies of tuning frequency and level of spurious components in the spectrum of the lo signal.

A known method of measuring the amplitudes and phases of the harmonics of the signal, which compare the amplitude and phase of the harmonics of exemplary oscillation, amplitude, phase and frequency are known [1].

The disadvantages of this method is the length of the control, the complexity of the equipment, because you have to have additional frequency synthesizer as a source of reference voltage of known frequency and amplitude.

There is a method of measuring attenuation of sensitivity on the out-of-band channels receiving the radio (RP), educated side components in the spectrum of the heterodyne voltage that is closest to the proposed and adopted for the prototype, which set narrow bandwidth amplifier SPM, serves a control signal from the signal generator to the input of SPM, configure the path PN on the control signal, fix the level of the output signal path RP on the main receive channel, change the frequency settings of SPM in both directions from the frequency of the control signal determines the frequency of side receiving channels increase the amplitude of the control signal at the input of the tract RP that is fixirovannomu the level of the output signal path when configuring the main receive channel, determine the attenuation of the sensitivity for each of the out-of-band channels as the ratio of the amplitude of the control signal at the input of the path PN on the frequency of out-of-band channel and receive on the frequency of the main receive channel [2].

The disadvantage of this method is the lack of functionality for monitoring the operating conditions, because it is not possible to control such an important parameter lo is made in the form of a frequency synthesizer, as the inaccuracy of the frequency settings. This means that for a full quality control of the lo signal addition device that implements the method-prototype, you want to use other devices that implement other ways. In addition, the prototype method requires sophisticated equipment for its implementation, as it requires control signal with a calibrated attenuator.

The purpose of the present invention to increase the functionality by providing control of the main parameters of lo - inaccuracies of tuning frequency and level of spurious components in the spectrum of the lo signal for multi-channel RP.

To achieve the above purpose, the method of controlling the quality of the signal getcontrollername channel radio (PKK), configure the PKK controlled by control signal to change the frequency settings of SPM in both directions from the frequency of the control signal determines the frequency of side receiving channels, wherein one of the PKK, namely the first, is used as the analyzing, the output signal of the inverter controlled by the PKK transform frequency in the working frequency band multi-channel receiver, serves the converted signal to the input of the analyzing of the first PKK, rebuild analyzing the PKK in the frequency band of the converted signal with a step equal to the smallest integer greater than the quotient of dividing the band of the converted signal by the number of points of the settings shown on the display, at each frequency relieve samples of the amplitude of the signal, considering them samples of the amplitudes of the spectral components of the local oscillator, display of the amplitude of spectral components, placing them sequentially in descending order or ascending frequency, determines the frequency and amplitude of the main response of the output signal controlled by the PKK, determine the amplitude response spurious signal components at the output of the controlled PKK, determine the ratio of the amplitudes osnovnoj which indicate the conclusion about the health of the local oscillator according to the criterion of the level of spurious components, compare the frequency of the main response signal at the output of the controlled PKK with known and by comparing the results, draw conclusions about the health of the local oscillator according to the criterion of accuracy frequency setting.

The combination of distinctive features and characteristics of the present invention from the literature are not known, therefore it meets the criteria of "novelty" and "inventive step".

In Fig. 1 shows a functional diagram of a device that implements the proposed method, Fig. 2 is a functional diagram of the first power amplification and conversion (epmo) 3; Fig. 3 is a functional diagram of the second unit BUP 4; Fig. 4 is a block diagram of the control unit 7 of Fig. 5 is a block diagram of the connection unit 8, 9.

The proposed method includes the following steps:

applying the control signal to the input of the controlled channel radio (PKK);

- configure the PKK controlled by the control signal;

- convert in frequency the output signal of the inverter controlled by the PKK in the working frequency range of the multi-channel radio;

applying the converted signal to the input of the analyzing of the first PKK multi-channel radio;

- Perez, exceeding the quotient of the band of the converted signal on the number of points of settings that are displayed on the display;

- at each frequency relieve samples of the amplitude of the signal at the output of the analyzing of the PKK, considering them samples of the amplitude of the spectral components of the signal of the local oscillator;

- display of the amplitude of spectral components, placing them sequentially in descending order or ascending frequency,

- determine the frequency and magnitude of the primary response of the output signal controlled by the PKK,

- determine the amplitude of the response side of the spectral components of the signal at the output of the controlled PKK,

- determine the ratio of the amplitude of the primary response and side components,

- compare the ratio with a threshold, by comparing the results, draw conclusions about the health of the local oscillator according to the criterion of the level of spurious components,

- compare the frequency of the main response of the output signal of the controlled PKK with known and by comparing the results, draw conclusions about the health of the local oscillator according to the criterion of accuracy frequency setting.

The device implementing the method of controlling the quality of the signal Goethe x input which is the input device, to the second input connected to the control signal generator 2, and the output connected to the series-connected first 3 and second 4 blocks amplification and conversion (epmo). The output of the second BUP 4 is connected to series-connected amplitude detector (AD) 5 and an analog-to-digital Converter (ADC) 6. Input and output control unit 7 is connected to the first input and the output of the first interface block (BS) 8, the second input and the output of which is connected to the first output and the input of the second BS 9. The second input and the output of the second BS 9 is connected to the first output and the input of the third BS and so on up to BS 9.N. The third and fourth outputs of the first BS 8 are connected, respectively, with the control input of the control signal generator 2 and the control input of the first BUP 3. The third and fourth outputs of the second BS 9 are connected, respectively, with the control input of the second BUP 4 and the output of the ADC 6.

The outputs of the second BUP 4.2 - 4.N is connected with the first - N-1-th inputs of the switch 10, respectively. The output switch 10 through the mixer 11 to the second input of which is connected an auxiliary local oscillator 12 connected to the input of the directional coupler 1.1.

The directional coupler 1, the control signal generator 2, the first BUP 3, the second BUP 4, AD 5, ADC 6P> First BUP 3 contains (Fig. 2) connected in series amplifier high frequency (UHF) 14, which input is the input of the mixer 15 to the second input of which is connected to the local oscillator 16 and amplifier 17 whose output is the output of the block. Control inputs of the local oscillator 16, amplifier 17 and UHF 14 are input to the control unit.

Second BUP 4 contains (Fig. 3,a) connected in series UHF 18, the inlet of which is the entrance block, the adder 19 to the second input of which is connected to the local oscillator 20 and amplifier 21 whose output is the output of the block. Control inputs lo drive 20, amplifier 21 and UHF 18 are input to the control unit.

Second BUP 4 (Fig. 3b) may also contain connected in series amplifier 22, the inlet of which is the entrance BUP 4 and block filters (BF) 23 whose output is the output BUP 4. Control inputs of the amplifier 22 and BF 23 are managing input BUP 4.

The control unit 7 (Fig. 4) contains a clock 24, a processor 25, a controller 26, 27, 28, the driver 29, the decoders 30, 31, 32, 33, permanent memory (ROM) 34, a random access memory (RAM) 35, the indicator 36, the data bus (SM), the control bus (SHU), address bus (SHA). The control unit can provide the Oia 8, 9 (Fig. 5) contains the first 37 and second 38 receivers, the inputs of which are respectively the first and second inputs BS 8 and 9, the first 39 and second 40 transmitters, the outputs of which are, respectively, the first and second outputs BS 8 and 9. In BS 8, 9 also includes a transmitter 41 and the Converter serial code to parallel and parallel to serial 42. The third input and output BS 8 and 9 are the second input and output of the Converter 42.

The block 42 may be performed on the chip KUG [3, S. 236].

Blocks 32-36 are designed to align with and can be performed on the chip CAP [3, S. 272].

Proposed method of control works as follows. When the control uses the control signal with a fixed frequency with a known lower fluctuations than level fluctuations and side components of the lo signal x(t) tract of the PKK. The mixer is controlled by the PKK (blocks 15 and 19) is linear plot its characteristics, so it is a linear multiplier of the input signal with the lo signal.

Power spectral density (SPM) phase fluctuations of the signal at the output of the PKK in this scenario will repeat type SPM phase fluctuations with the presence of lo - inaccuracies of tuning frequency and the level of spurious components in the spectrum of the lo signal.

Modern RP is performed with local oscillators, made in the form of frequency synthesizer [6] . This allows the frequency code. In the microwave frequency range midrange usually include several rings PLL with a fixed stand, when this major step of measuring the frequency of the local oscillator, for example, hundreds of MHz, is performed by switching the frequency of the stand [7, 8]. Practice shows that one of the main problems with heterodyne microwave range is the lack synchronize the output ring PLL, the frequency of the local oscillator, and therefore, the frequency SPM shifted with respect to its true value. The proposed method, unlike the prototype, controls this problem.

Consider a device that implements the proposed method of control.

The multi-channel SPM are identical device frequency conversion using a mixer 15, 19 and local oscillators 16, 20. Breeding frequency and amplification are performed using the if amplifier 17, the filters 21 and 23. The channels differ only addresses blocks, and can be controlled independently.channel. In the process control RP VHF - and UHF-band, intended for reception of signals with a bandwidth units-tens of MHz in a controlled PKK included a wide filter to not weakened side components in the spectrum of the control signal, and the first CRC is enabled the narrowband filter available in BUP 4 (amplifier 21 or block filters 23).

The processor 25 operates according to the program recorded in the ROM 34. Control codes restructuring channel SPM 13, the trigger signal ADC 6 are formed in the processor 25 and transmitted to the controller 27, where they are converted into sequential code, for example, type "Manchester", amplified and transmitted to connected in series BS 8, 9

BS 8 and 9 allows remote control units via the serial line and eliminate many of the control circuits necessary to control the parallel bars. This is especially effective when you explode in space blocks of multi-channel radio.

The control code consists of two code packages: command word (CS) and data word (IP). Each BS 8 and 9 has its own address, consisting of 6 digits and converts the serial code received at its first input, in parallel crashed parallel code in a consistent and passes it through the transmitter 40 to the next BS. The BS 8 or 9, in which the address code coincides with the address part of the management package, sends via transmitters 41 and 39 to the control unit 7 answer for admission information. The principles of application interface kit BIS usual, as described, for example, in [3, S. 239-243].

In BS 8, 9 control code converted from serial to parallel code and transmitted from the BS 8: generator control signal 2 (enabled before the measurements) and the first BUP 3; from the second BS 9: on the second BUP 4 and ADC 6. Features of the ADC control 6 is determined by its type, for example, when using ADC type CPV they are described in [5, S. 72].

The control unit 7 generates code to set the frequency of the control channel is equal to the frequency control signal ftoafter this BU 7 generates code to set the frequency analyzing channel equal to the lower (or upper) frequency f1the analyzed frequency band, which is fed to the lo 16.1 and, if available, heterodyne 20.1, thereby adjusting BF 23.1 or upch 21.1 frequency f1.

The control unit 7 generates the code setting the lower frequency f1the analyzed frequency band, which is supplied to the local oscillator 16 and, if present, the local oscillator 20, thereby adjusting BF 23 the BUP 3.1 thus, to the frequency analyzing the PKK has changed in the frequency range fn- finequal to the bandwidth of the if amplifier 21 or one of the filters of the filter unit 23.

At each frequency f1analyzing the KRG allocates filter spectral component of the control signal generator at a frequency fi. ADC 6 start signal with BU 7 generates the amplitude envelope of X(fi), which through BS 9 arrives at BU 7 and is filled in the RAM 35.

After removal of the samples in the band of the measured frequency response, determined by the frequency and amplitude of the primary response of the control signal, the amplitude of the response side of the spectral components of the lo signal, the ratio of the amplitude of the primary response and side components.

According to the results of a comparison of the ratio with a threshold, make a conclusion about the efficiency of the local oscillator according to the criterion of the level of spurious components, and the results of the comparison frequency of the main response of the control signal with known make a conclusion about the efficiency of the local oscillator according to the criterion of accuracy frequency setting.

The proposed method provides, unlike the prototype, the main control pgina for multi-channel RP.

In MIERS developed a model of the device that implements the proposed method, tests showed the achievement of this goal.

The sources of information.

1. Skripnik Yu A. Modulation of measurement and circuits, M: Owls. radio, 1975, S. 133.

2. Golubev, C. N. The frequency selectivity of the radio of AM signals, M: Communications, 1970, S. 189.

3. Horsetail S. T. and other Microprocessors and microcomputers in automatic control systems. - Leningrad: Mashinostroenie, 1987.

4. Malakhov, A. N. Fluctuations in self-oscillating systems. - M.: Nauka, 1968, 660 S.

5. High-speed integrated circuits DAC and ADC and measurement of their parameters. Under the editorship of Marcinkevicius. M.: Radio and communication, 1988.

6. Golovin, O. C. Professional receiving device decameter range. M.: Radio and communication. 1985.

7. Manasevich Century. frequency Synthesizers. - Theory and design, M.: Communication, 1979.

8. Galin, A. C.-Band-quartz stabilization of the microwave. M: Communications, 1976, 56 S.

The method of controlling the quality of the lo signal multiband superheterodyne radio receiver, which serves a control signal to the input of the controlled channel radio, nestruev is in both sides of the frequency control signal, determine the incidence of side receiving channels, wherein one channel radios, namely the first, is used as the analyzing, the output signal from the intermediate frequency controlled channel convert radio frequency in the working frequency band multi-channel receiver, serves the converted signal to the input of the analyzing of the first channel radio, rebuild analyzing channel radio in the frequency band of the converted signal with a step equal to the smallest integer greater than the quotient of dividing the band of the converted signal by the number of points of the settings displayed on the indicator, for each frequency settings relieve samples of the amplitude of the signal, considering them samples of the amplitudes of the spectral components of the local oscillator, display of the amplitude of spectral components, placing them sequentially in descending order or ascending frequency, determines the frequency and amplitude of the main response of the output signal of the controlled channel receiver, determine the amplitude response spurious signal components at the output of the controlled channel receiver, determines are appropriate to the comparison make a conclusion about the efficiency of the local oscillator according to the criterion of the level of spurious components, compare the frequency of the main response of the output signal of the controlled channel radio with known and by comparing the results, draw conclusions about the health of the local oscillator according to the criterion of accuracy frequency setting.

 

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