RU177562U1 - Receiving device - Google Patents

Abstract

The utility model relates to the field of radar technology, namely to receiving devices that are part of the secondary surveillance radar (SSR). The technical result is aimed at creating a receiving device with integrated health monitoring, with a high degree of suppression of out-of-band signals, providing high-quality reception of a pulsed microwave signal at frequency 1030 MHz. For this, the receiving device contains identical first and second receiving channels, each of which includes a power limiter, bandpass Filter and the first linear amplifier. In addition, the device contains a test signal generation unit, a frequency synthesizer and a detection unit, and each of the receiving channels further comprises a switch, a mixer, a second linear amplifier, an intermediate frequency filter, a third linear amplifier, a divider and a converter. The input of the power limiter is the input of the receiving channel, and its output is connected to the first input of the switch, the output of which is connected to the input of the bandpass filter. 1il.

Description

The utility model relates to the field of radar technology, namely, to receiving devices that are part of the secondary surveillance radar (SSR), which is designed to perform the functions of monitoring the aircraft with ground-based air traffic control devices (ATC) in modes A, C, S ( standard modes for receiving address request signals at a frequency of 1030 MHz).

The prior art multichannel microwave receiver with double frequency conversion (RF patent No. 2452089, IPC: Н04В 1/06, publ. 05.27.2012) containing a power divider, control circuit, frequency multiplier, switch and n receiving channels, each of which contains a cyclotron protective device, a low noise amplifier, a valve, two frequency mixers, a first bandpass filter, a first amplifier of a first intermediate frequency, a first switch, a second bandpass filter, a first attenuator, a second switch, a second amplifier numerator of the first intermediate frequency, a second attenuator, the third attenuator, the third power of the first intermediate frequency stage of thermal stabilization, the fourth attenuator, third, fourth and fifth switches, the fourth power of the first intermediate frequency, a third band-pass filter, the amplifier of the second intermediate frequency and the fifth attenuator.

As a prototype for the claimed utility model, a transceiver module was selected (module MAIA-009992-000000 of the SOVNAM company, Internet: http://www.cobham.com/sensorsystems), the microwave receiving part of which consists of two receiving channels, each of which contains sequentially connected power limiter, linear amplifier and bandpass filter.

This module provides signal reception at a frequency of 3.1 GHz. It should be noted that for the operation of receiving devices as part of the aforementioned SSR, it is necessary that the reception of address request signals at a frequency of 1030 MHz be ensured.

The technical problem solved by the creation of this utility model is the lack of built-in health monitoring, as well as insufficient suppression of out-of-band signals. In addition, the above counterparts work with reception frequencies other than 1030 MHz.

The technical result is aimed at creating a receiving device with integrated health monitoring, with a high degree of suppression of out-of-band signals, providing high-quality reception of a pulsed microwave signal at a frequency of 1030 MHz.

The technical result is achieved in that the receiving device contains identical first and second receiving channels, each of which includes a power limiter, a bandpass filter and a first linear amplifier. In addition, the device contains a test signal generation unit, a frequency synthesizer and a detection unit, and each of the receiving channels further comprises a switch, a mixer, a second linear amplifier, an intermediate frequency filter, a third linear amplifier, a divider and a converter. The input of the power limiter is the input of the receiving channel, and its output is connected to the first input of the switch, the output of which is connected to the input of the bandpass filter. The output of the bandpass filter is connected to the input of the first linear amplifier, the output of which is connected to the first input of the mixer. The output of the mixer is connected to the input of the second linear amplifier, the output of which is connected to the input of the intermediate frequency filter. The output of the intermediate frequency filter is connected to the input of the third linear amplifier, the output of which is connected to the input of the divider. The first output of the divider is connected to the input of the converter, the output of which is the output of the receiving channel. The second inputs of the switch and mixer are connected to the test signal generation unit and the frequency synthesizer, respectively, and the second divider output is connected to the detection unit.

The essence of the claimed utility model is illustrated in the figure, which shows the functional diagram of the receiving device.

The receiving device comprises a first receiving channel (PC1) 1, an identical second receiving channel (PC2) 2, a test signal generating unit (UFTS) 3, a frequency synthesizer (MF) 4, and a detection unit (UD) 5.

Each of the two receiving channels includes a power limiter (OM) 6, a switch (K) 7, a bandpass filter (PF) 8, a first linear amplifier (LU1) 9, a mixer (C) 10, a second linear amplifier (LU2) 11, intermediate frequency filter (FPF) 12, the third linear amplifier (LU3) 13, the divider (D) 14 and the converter (Pr) 15. The input OM 6 is the input of the receiving channel, and its output is connected to the first input K 7, the output of which connected to the input of PF 8. The output of PF 8 is connected to the input of LU1 9, the output of which is connected to the first input C 10. The output of C 10 is connected to the input of LU2 11, Exit of which is connected to the input 12. The output FPH FPH 12 is connected to LU3 entry 13 whose output is connected to the input 14. A first output 14 is connected to the D input of Ex 15, whose output is the output of the reception channel. The second inputs K 7 and C 10 are connected to UFTS 3 and MF 4, respectively, and the second output D 14 is connected to the UD 5. At the same time, the outputs PK1 1 and PK2 2, as well as the output of UD 5, are designed to connect a control device to them.

Consider the operation of the receiving device as an example of the passage of the received signal through PC1 1. Since the construction of PC2 2 is identical to PC1 1, the passage of the received signal through it will be similar.

The signal received by the antenna is fed to the input OM 6, which performs the function of protecting the input stages from a powerful microwave signal. From the output of OM 6, the signal is supplied to the first input K 7, which acts as a switch between the input and test signals. In this case, the test signal is generated using UFTS 3 in the internal health monitoring mode and is supplied to the second input K 7. This signal is equivalent to the input signal from the antenna and is generated at a frequency of 1030 MHz with amplitude-phase modulation. From the output of K 7, the signal is fed to PF 8 to form a preliminary amplitude-frequency characteristic (AFC) and suppress out-of-band (background) signals. After PF 8, the signal is amplified in LU1 9 to the desired level, and then fed to the first input C 10 to generate an intermediate frequency signal. At the same time, a signal from MF 4 is supplied to the second input C 10, which generates a signal for the mixers of both receiving channels (provides the formation of an intermediate frequency signal). From output C 10, the signal passes through LU2 11, where it is amplified again, after which it enters the PLL 12, which provides the required selectivity and also helps to suppress out-of-band (background) signals. After the FPF 12, the signal is additionally amplified in LU3 13 and through D 14 it enters Pr 15, where it is converted into a pulsed DC voltage output signal. From the second output D 14, a pulse phase-modulated (FM) intermediate frequency signal is supplied to UD 5, by means of which it is converted into a pulsed constant voltage signal. The inclusion of this node in the phase demodulation mode occurs automatically according to the results of decoding the input signal. The output signals from both receiving channels and from the UD 5 enter the control device for further processing.

To confirm the implementation of the proposed technical solution, a prototype of the receiving device was assembled.

This receiver is functionally a microwave signal transceiver with one frequency conversion to an intermediate frequency (IF) signal and its subsequent conversion into pulsed DC voltage signals. The device contains two identical receiving channels 1 and 2, in which the input signal is switched, selection, amplification and conversion into a pulse signal of constant voltage. OM 6 of each channel is a limiter made on diodes CLA4601-219. K 7 is made on a HMC284AMS8GE chip, PF 8 is made on a surfactant (880367), LU1 9 is made on an ERA-8SM + chip. As C 10, an RMS-30 + mixer is used. LU2 11 is the primary stage of the amplifier, made on the chip ERA-3SM +. The FPF 12 is made on discrete elements with characteristics that provide a high degree of suppression of out-of-band signals. LU3 13 is a secondary stage of the amplifier, made on the chip ERA-2SM +. D 14 is made on the SBTC-2-10L + microassembly, Pr 15 is made on the AD8310ARMZ chip.

In addition, the receiving device contains UFTS 3, MF 4 and UD 5, operating on both receiving channels.

The UFTS 3 of this receiver includes: a broadband frequency synthesizer with an integrated voltage-controlled oscillator; amplitude and phase modulators designed to modulate the synthesizer signal; step attenuators to adjust the signal level; output signal switch for switching the output test signal to the switch PK1 1 or to the switch PK2 2. UFTS 3 provides the ability to monitor the health of the claimed device by generating a signal equivalent to the input signal from the antenna (test mode).

MF 4 generates a signal for the mixers of both receiving channels and includes a broadband frequency synthesizer with an integrated voltage-controlled generator, a microwave amplifier to amplify the synthesizer signal to the desired level, and a microwave signal divider designed to separate the amplified signal into two channels.

UD 5 is a node for detecting a signal with relative phase modulation and includes: an input signal switch designed to switch the input FM signal from PC1 1 or from PC2 2; limiting amplifier with AGC for amplifying the FM IF signal to the required level; an amplifier for additional amplification of the FM IF signal; a 250 ns delay line necessary to form the required phase shift along one of the inputs of the phase demodulator mixer; an amplifier for additional amplification of the FM IF signal after the delay line; a mixer for summing two signals and generating a pulsed constant voltage signal depending on the phase ratio in the IF signal; an amplifier for additional amplification of a pulsed DC signal after the mixer.

Thus, the claimed receiving device includes a health monitoring function, and also provides effective suppression of out-of-band signals. The receiving device provides stable signal reception at a frequency of 1030 MHz and can be used as part of an SSR operating in modes A, C, S. In addition, this device uses radioelements with characteristics that allow it to work in an extended operating temperature range from -40 ° C to + 55 ° C.

The receiver was tested in the decimeter frequency range and showed the following results (in accordance with the specified requirements):

- input sensitivity - no more than (-110) dB;

- dynamic range in all operating modes - not less than 50 dB;

- suppression of a mirror channel of reception - no more (-70) dB;

- operating temperature range - from -40 ° С to + 55 ° С;

- isolation between channels - no more than (-50) dB.

Claims (1)

A receiving device containing identical first and second receiving channels, each of which includes a power limiter, a bandpass filter and a first linear amplifier, characterized in that, in addition, the device includes a test signal generation unit, a frequency synthesizer and a detection unit, and each from the receiving channels further comprises a switch, a mixer, a second linear amplifier, an intermediate frequency filter, a third linear amplifier, a divider and a converter, while the input of the power limiter is is the input of the receiving channel, and its output is connected to the first input of the switch, the output of which is connected to the input of the bandpass filter, the output of the bandpass filter is connected to the input of the first linear amplifier, the output of which is connected to the first input of the mixer, the output of the mixer is connected to the input of the second linear amplifier, the output which is connected to the input of the intermediate frequency filter, the output of the intermediate frequency filter is connected to the input of the third linear amplifier, the output of which is connected to the input of the divider, the first output of the divider n from the transducer input, the output of which is the output of the receiving channel, the second inputs of the switch and the mixer are connected to a node generating a test signal and a frequency synthesizer, respectively, and the second divider output coupled to the detection node.

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