Device for measuring the amplitude-frequency characteristics of the paths of n-channel superheterodyne receiver complex

 

(57) Abstract:

The invention relates to the field of radio and can be used to measure the amplitude-frequency characteristics (AFC) of the tract as a single-band superheterodyne radio receiver (RP), and a multichannel receiver complex (TOC), the local oscillators are tunable synthesizers frequency (MF). The purpose of the invention is the provision of independent automatic measurement of the frequency response amplifier of each of the N channels RPK microwave range and reduce measurement error. Device for measuring the frequency response paths of N-channel RPK contains N channels, the first channel includes a serially connected first interface unit, the generator control signal of a fixed frequency and a directional coupler. connected in series detector and analog-to-digital Converter and the second connection unit, the first output and the second input of which is connected respectively to the first input and the second output of the first connection unit, and the analog-digital Converter connected to the output of the amplitude detector. All other channels are identical to the first, with the input of the directional coupler is input is, I can pay tithing block pair of the first channel, the second output and the third input of the second connection unit of each channel, except the last, are connected respectively with the second input and the third output of the first connection unit of the next channel, the output of the directional coupler in each channel connects the inlet channel of the radio and the input of the amplitude detector is input to connect an output channel of the radio receiver, the first and second control inputs of which are connected respectively with the fourth output of the first connection unit and the third output of the second connection unit. 6 Il.

The invention relates to the field of radio and can be used to measure the amplitude-frequency characteristics (AFC) of the tract as a single-band superheterodyne radio receiver (RP), and a multichannel receiver complex (TOC), the local oscillators are tunable synthesizers frequency (MF).

It is known device for measuring the frequency response comprising a generator with fixed frequency settings and the meter [1, page 29].

A disadvantage of this device is the long measurement time, since the frequency response is built on the values of the individual measurements at each frequency.

Issuesa frequency (GCC), the amplitude detector and the meter [1, page 29].

A disadvantage of this device is the high measurement uncertainty frequency response narrowband filters the intermediate frequency amplifier (if amplifier) controlled RPK microwave range.

Own frequency instability of the oscillator of the microwave range is of the order of 10-3[2], i.e. in the range above 1 GHz, it will be the value of more than 10 kHz. This circumstance does not allow to measure end-to-end frequency response of the tract RPK UHF range with a bandwidth unit - hundreds of kHz.

The second disadvantage of the prototype is the width limit of the measured strip when it is used for measurements in automatic mode, because of the instability strip boundaries swing GCC and the impossibility of accurate frequency setting GCC.

A significant reduction of instability installation strip boundaries swing GCC and increase the accuracy of frequency setting GCC is only possible through the use of frequency synthesizers. However, produced by domestic industry two types of frequency synthesizer C-31 and C-71 do not provide a measurement of the frequency response narrowband filter amplifier UHF range when using them as GCC, because the synthesizer C-31 has a range of REGO C-2 (the maximum multiplication factor 8). Synth C-71 has a range of frequencies up to 1.3 GHz, step frequency from 1 kHz to 100 MHz, which does not allow to measure the frequency response of filter amplifier with a bandwidth less than hundreds - tens of kHz.

The purpose of the invention is the provision of independent auto amplifier frequency response of each of the N channels RPK microwave range and reduce measurement errors.

To achieve this goal a device measuring the frequency response paths of N-channel superheterodyne RPK, containing the first channel that includes amplitude detector.

According to the invention, the first channel has been consistently connected to the first connection unit, the generator control signal of a fixed frequency and a directional coupler, connected in series analog-digital Converter and the second connection unit, the first output and the second input of which is connected respectively to the first input and the second output of the first connection unit, and the analog-digital Converter connected to the output of the amplitude detector, and entered the control unit and the N-1 channels, identical to the first, with the input of a directional coupler is the input of each channel, input and output control unit connected to appropriate the course of the second unit pair each channel, except the last, are connected respectively with the second input and the third output of the first connection unit of the next channel, the output of the directional coupler in each channel connects the inlet channel of the radio and the input of the amplitude detector is input to connect an output channel of the radio receiver, the first and second control inputs of which are connected respectively with the fourth output of the first connection unit and the third input of the second connection unit.

In Fig. 1 shows a functional diagram of the proposed device.

In Fig. 2 shows a functional block circuit diagram of the amplification and conversion (epmo) 9.

In Fig. 3 shows a functional diagram BUP 10.

In Fig. 4 shows a functional diagram of the control unit 6.

In Fig. 5 shows a functional diagram of the block pair 7, 8.

Structural diagram of the algorithm of operation of the device shown in Fig.6.

Device for measuring the frequency response paths of N-channel RPK contains (Fig. 1) directional coupler 1, the first input which is the input device, the second input connected to the oscillator control signal with a fixed frequency (HKSFC) 2, and the output with the output of the amplitude detector (AD) 4 and an analog-to-digital Converter (ADC) 5. Input and output control unit 6 is connected to the first input and the output of the first interface block (BS) 7, the second input and the output of which is connected to the first output and the input of the second BS 8. The second input and the output of the second BS 8 is connected with the first output and the input of the third BS, and so on up BS 8.N. The third and fourth outputs of the first BS 7 are connected respectively to the input control GXFC 2 and the first control input channel RP 3. The third and fourth outputs of the second BS 8 are connected respectively with the second control input channel RP 3 and the output of the ADC 5. Channel RP 3 contains a serially connected first 9 and second 10 blocks amplification and conversion (epmo).

The directional coupler 1, GXFC 2, the first BS 7 combined in a high frequency unit 11, and AD 4, the ADC 5 and BS 8 are combined in amplifier is demodulated block 12.

First BUP 9 contains (Fig. 2) connected in series amplifier high frequency (UHF) 13, an input is an input unit, a mixer 14, the second input of which is connected to the local oscillator 15 and amplifier 16 whose output is the output of the block. Control inputs lo drive 15, amplifier 16, and the UHF 13 are input to the control unit.

Second BUP 10 includes (Fig. 3A), the United States is the inverter 20, the output which is the output of the block. Control inputs of the local oscillator 19, amplifier 20 and UHF 17 are input to the control unit.

Second BUP 10 (Fig. 3b) may also contain connected in series amplifier 21, the inlet of which is the entrance BUP 10, and the block filters (BF) 22 whose output is the output BUP 9. Control inputs of the amplifier 21 and BF 22 are managing input BUP 10.

The control unit 6 (Fig. 4) contains a clock 23, a processor 24, a controller 25, 26, 27, shaper 28, decoders 29, 30, 31, 32, ROM 33, RAM 34, the indicator 35, a data bus (SM), the control bus (SHU), address bus (SHA). The control unit can be performed, for example, based on microprocessor kit series 580 [3, page 64 - 114].

The interface block 7, 8 (Fig. 5) contains the first 36 and second 37 receivers, the inputs of which are the first and second inputs of the BS, respectively, the first 38 and second 39 transmitters, the outputs of which are respectively the first and second outputs BS 7, 8. In BS 7, 8 also includes a transmitter 40 and Converter serial code to parallel and parallel to serial 41. The third input and output BS are the second input and output of the inverter 41.

The block 41 may be the issue is Alov, buffering data bus and can be performed on the chip KRUK.

The block 27 is designed to provide management indicator 35. It can be executed on the chip KRUG for the case when the indicator 35 is made in the form of a cathode-ray tube.

The blocks 31 to 35 are designed to align with and can be performed on the chip CAP [3, page 272].

The proposed device operates as follows.

Channels RPK are identical device frequency conversion using the mixers 14, 18 and local oscillators 15, 19. Breeding frequency and amplification are performed using amplifier 16, 20 and filter 22. Channels RPK differ in address blocks and can be independently configured for different frequencies with different bands filter selection. Each unit has its own address.

In the ROM 33 of the control unit 6 written programme of work of the device and the following constants:

the boundaries of the frequency range of the measured frequency response of the lower Fyand the top Fin;

the number of points of settings in the analysis of NN;

tuning step as the difference between two adjacent frequency setting FW= (Fin- Fn)/NN.

The processor 24 then cityfeetlocal 29, filing a read command on the control bus (SHU) and receive data on the data bus (SM) via the controller 25. After receiving the command, the processor 24 executes it in accordance with its contents, that is, performs or processing operation or operations for sending control commands to the units of the device, or receive operation information from block devices, or surgery for sending information in the RAM 34 and back.

Command control blocks of the device are two 16-bit binary code (command word and an information word) that the controller 26 is converted into a serial bi-phase unipolar type code "Manchester", these signals are transmitted through the serial communication line with the BU 6 BS 7.1 channel 1, broadcast later on BS 8.1, and then arrive at the BS 7.2, BS 8.2 and so on until the last channel.

The received signal at each BS 7, 8 is converted in block 41 in 16-bit binary control code, which is in accordance with [3, pp. 239 - 242] contains the address of the BS receiving this command, and information for execution. Each BS address portion of the command word from the accepted parcel is compared with its own address BS, if there is a match this BS sends about on GXFC 2 and the first BUP 9, from BS 8 on the second BUP 10 and the ADC 5.

Structural diagram of the algorithm of operation of the device shown in Fig. 6.

In accordance with a control algorithm, the processor 24 via the controller 26 sends to BS 7 of the control channel command to enable GXFC 2. This command goes through connected in series BS 7.1, BS 8.1, BS 7.2, BS 8.2 and so on until the last BS in the device, the BS whose address coincides with the address part of the command, sends in BU 6 command confirmation command to enable GXFC 2, which passes through all connected in series BS in the opposite direction to the BU 6.

After that, the CPU 24 through the controller 25 sends to BS 7 of the control channel command to set the frequency BUP 9 of the control channel is equal to the lower frequency of the measured frequency response Fn. This command goes through connected in series BS 7.1, BS 8.1, BS 7.2, BS 8.2 and so on until the last BS in the device, the BS whose address coincides with the address part of the command, sends in BU 6 command confirmation command to set the frequency that passes through all connected in series BS in the opposite direction to the BU 6.

Next, the CPU 24 through the controller tit through connected in series BS 7.1, BS 8.1, BS 7.2, BS 8.2 and so on until the last BS in the device, the BS whose address coincides with the address part of the command, sends in BU 6 command confirmation command for withdrawal of reference amplitude and a reference X(Fi) amplitude of the ADC 5 of the control channel. The processor 24 via the controller 26 receives the code of the amplitude of X(Fi) and stores it in the RAM 34.

Installation of frequency, which is incremented every time step FWand removing the amplitude at each frequency Firepeat up until the frequency becomes equal to the upper frequency of the measured frequency response Fin. Then BO 6 sends a command to BS 7 of the control channel on off GXFC 2.

After removal of samples of the amplitude of X(Fi) in the band of the measured frequency response, when the RAM 34 recorded NN samples of the measurements is determined by the maximum Xmaxand minimum XminADU. For this purpose, the processor 24 reads the codes of the samples of the amplitude of X(Fifrom RAM 34 by setting the cell address of the RAM 34 by the address bus of the SHA through the shaper 28 and the decoder 32, the supply of the read command on the control bus (SHU) and receive data on the data bus (SM) via the controller 25. Initially Xminand Xmaxand if it is less Xminthen the value of Xmin= X(Fi), and if it is greater than Xmaxthen Xmax= X(Fi). After an exhaustive search of all NN frequency is determined by the difference Xmax- Xmin.

Literature

1. Correction of distortion in the transmission channels and the channels of communication /edited Popova N. C. - M.: Communication, 1979.

2. The design of radio receivers /Ed. by Sievers. - M: C. 11.

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

4. High-speed integrated circuits DAC and ADC and measurement, Ed. of Marcinkevicius. - M.: Radio and communication. 1988.

Device for measuring the amplitude-frequency characteristics of the paths of N-channel superheterodyne receiver of the complex containing the first channel that includes amplitude detector, wherein the first channel has been consistently connected to the first connection unit, the generator control signal of a fixed frequency and a directional coupler, connected in series analog-digital Converter and the second connection unit, the first output and the second input is connected to CE the El is connected to the output of the amplitude detector, and entered the control unit and the N-1 channels, identical to the first, with the input of a directional coupler is the input of each channel, the input and output control unit are connected respectively with the third output and the second input of the first connection unit of the first channel, the second output and the third input of the second connection unit of each channel, except the last, are connected respectively with the second input and the third output of the first connection unit of the next channel, the output of the directional coupler in each channel connects the inlet channel of the radio and the input of the amplitude detector is input to connect an output channel radio the first and second control inputs of which are connected respectively with the fourth output of the first connection unit and the third output of the second connection unit.

 

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