Station electronic reconnaissance

 

(57) Abstract:

The invention relates to electronic reconnaissance. The technical result of the invention is to increase the dynamic range of the station's signals intelligence. This technical result is achieved by the fact that the radio station exploration, consisting of the input channel, frequency-selective coupler, and an adder for N-channel mixer with a local oscillator, a receiving device, the analysis device and the device memory and information processing in each channel also includes two mixer, two filters and the second lo. 1 Il., table 1.

The invention relates to electronic reconnaissance.

Known station signals intelligence, which contains the input path, the receiving device, the unit of analysis and the unit of storing and processing information (see, for example, C. A. akin, L. N. Shustov "basics of jamming and radio", Moscow, "Sov.radio", 1968, page 382). The received signal through the input path is delivered to the receiving device, the output of which is formed by the video signal coming into the analysis device, remember and process information .

The disadvantage of this station is a narrow band input frequency determined by the parameters of the constituent elements of the station.

Closest to the proposed technical solution is a multi-station electronic reconnaissance containing the input path, the receiving device, the analysis device, memory and information processing, frequency-selective coupler, a mixer with lo and summing device (see , for example, C. B. Hofmann, A. R. Baron. "Wideband ESM Receving Systems", Part II, "Microwave Journal, No. 2, 1981, p. 57).

The received signals through the input path are received in a frequency-selective splitter, which divides the operating frequency range of the station on the adjacent sub-bands. The frequency of the input signal corresponding subrange is converted using a mixer and local oscillator to the base intermediate frequency range, in which the receiving device. The frequency of the local oscillators are selected so that the reference range is a range of intermediate frequencies of all of the faucets, and the converted signals, regardless of which sub-range lay the initial values of their frequencies, by using the adder summed up in a single channel. Output sommaire device and the input device memory and information processing.

The disadvantage of the described device is the possibility of falling into the frequency band of the output signals of the mixer (basic range) Raman frequencies and frequencies of harmonic components of the input signals of low order, which limits the possibility of accurate determination of parameters of the received signals are narrow dynamic range. The most unfavorable case is when the base frequency is directly adjacent to the frequency range of input signals.

For example, if the base band boundary frequencies of 2-4 GHz, it is necessary to convert the frequency of the input signals from the band boundary frequencies of 4 to 6 GHz, while the frequency of the lo signal 8 GHz output frequency range of the mixer gets Raman frequency (2fwith-fg), the power level which is less than the power level of the useful signal by approximately 10 dB (see, for example, Orlov "analysis of the mutual modulation arising from the use of the crystal mixer, "Proceedings ot the IEEE", v.52, No. 2, 1964).

If in the basic range with boundary frequency 2 4 GHz it is necessary to convert the signal frequencies in the range of 0.1 - 2 GHz, the range of output frequency will be the frequency vtoi about 10 dB.

The aim of the present invention is to increase the dynamic range of the station's signals intelligence.

This objective is achieved in that the radio station exploration, consisting of the input channel, frequency-selective coupler, and an adder for N-channel mixer with a local oscillator, a receiving device, the analysis device and the device memory and information processing in each channel also includes two mixer, two filters and the second lo.

The specified implementation of the present invention provides a simultaneous increase of the input frequency and the local oscillator, which reduces the relative bandwidth of the output signals. This decreases the likelihood that the Raman frequencies of the low-order band of the input mixer, which in combination with selectable frequencies of the local oscillators and the output frequencies of the mixer allows to exclude from band output frequencies of the Raman frequencies of the low-order and solves the problem.

The applicant is unknown to the use of distinctive signs for the implementation of the technical reception that can make you station signals intelligence, consisting of input channel 1, multichannel frequency-selective splitter 2, each channel of which contains the first mixer 3 and a filter 4, the second mixer 5, the third mixer 6 with the filter 7, the first local oscillator 8 and the second local oscillator 9, and multi-channel adder 10, a receiver 11, an analyzing device 12 and device memory and information processing 13.

Receiving the signal through the input path 1 flows in a frequency-selective coupler 2, which divides the working frequency range of the station sub-bands. On the block diagram, shown in the drawing, shows a diagram of only one channel of the station. Schemes other channels similar to those shown.

Output frequency-selective splitter 2 signal is input to the first mixer 3 and after conversion through the filter 4 to the input of the second mixer 5. The signal frequency of the second local oscillator 9 via the third mixer 6 with the filter 7 and the first local oscillator 8 is converted up along the frequency axis and fed to the heterodyne input of the first mixer 3.

In the result of the first conversion in the mixer 3 and a filter 4 frequency signal is converted up along the frequency axis. The mixer 5, heterodyne input cat-axis frequency to the base frequency range (frequency range of the receiving device 11), and the signal through the adder 10 is delivered to the receiving device 11 and then to the device 12 and device for storing and processing information 13.

If f1and f2accordingly, the frequency of the first and second local oscillators 8 and 9, the output of the third mixer 6 with the filter 7 is allocated oscillation with frequency f1f2. (Here and below the symbol indicates the possibility of implementing two options conversion types). In the present case are oscillations with frequency f1+f2or with frequency f1-f2. The selected oscillation through the filter 7, which is designed to suppress the signal of the first local oscillator 8 and harmonic signals of the first and second local oscillators, is input to the first mixer 3, the output of which by means of the filter 4 is allocated the frequency (f1f2)+fcor frequency (f1f2)-fcwhere fcthe frequency of the input signal. This signal is input to the second mixer 5, the output of which produces a signal with a frequency of

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The filter 4 is designed to highlight the signal frequency (f1f2)+fcor frequency (f1f2)-fcand also to suppress the signal of the first local oscillator 8 to the Noi signal with frequency fcis converted into a signal with frequency f2fcor fc-f2i.e. input frequency range can be moved up or down along the frequency axis.

For sufficiently large values of the frequency of the first local oscillator 8 and the output frequency of the first mixer 3, the relative band width of the output frequencies of the mixer 3 is substantially narrows. In the band of operating frequencies of the mixers 3 and 5 will not get the frequency of the Raman components and harmonics of low order, which will provide a large excess of the level of the useful signal on the parasitic components of the spectrum of the output signals of the converters in excess of 60 dB.

The instability frequency of the first local oscillator 8 does not affect the accuracy of determination of the frequency of the input signals, because the result of the inverse transformation carried out by the first and second mixers 3 and 5, the error in the first mixer 3 is compensated for by the error of the opposite sign, resulting in the second mixer 5.

The proposed solution was implemented in the ranges of 0.5-1.0 GHz 1.0 To 1.9 GHz And 3.6-5.0 GHz and a basic range of 2.1-3.6 GHz.

In the table (see the end of the description) is given in GHZ frequency of the first and second getoriginalid first and second mixers 3 and 5. The frequency of the first local oscillator 8, the frequency of the output signals of the first mixer 3 and, respectively, the input signals of the second mixer 5 lie in the millimeter wavelength range.

The table shows that in this example, the frequency of the second local oscillator 9 and the input signal resulting from the conversion increase in order. Thus, the relative band width of the input frequency after the conversion in the first mixer 3 is reduced by about an order. This significantly reduces the probability of Raman frequencies of the components of low orders in output frequency range of mixers 3 and 5.

The bandwidth of the filter 7 is equal 30,6 of 34.6 GHz and filter 4 - 34,1-of 35.6 GHz. As the second local oscillator 9 was used highly stable oscillator, and as a first local oscillator 8 - generator on the Gunn diode type M. The instability frequency of the first local oscillator 8 will not affect the accuracy of the determination of the frequencies of the input signals, since this error will be compensated at the double-conversion mixers 3 (up conversion) and 5 (down conversion).

Studies have shown that when the selected frequency of the first local oscillator is dB. At the base range of 2.1-3.6 GHz and the ranges of input frequencies of 0.5-1.0 GHz 1.0 to 1.9 GHz width of the dynamic range of the prototype is limited to values of the order of 10-15 dB, because the band of output frequencies of the mixer in addition to the useful signal frequency falls within the frequency harmonics of the input signals of the low-order (second, third, etc.).

Thus, the use of the proposed solution will allow you to create a broadband station surveillance high dynamic range of input signals in excess of 60 dB, which find wide application in the technique of radio reconnaissance and jamming.

Station electronic reconnaissance contains the input path, frequency-selective coupler, N channels, each of which included the first mixer connected to the first local oscillator, connected in series adder, receiving device, the unit of analysis the unit of storing and processing information, and the input path connected to the input of frequency-selective splitter, the output of the first mixer each channel is connected with the corresponding input of the adder, wherein, to increase the dynamic range of the station, in to the than sequentially connected to the second mixer and the first filter connected between the corresponding output multichannel frequency-selective coupler and the signal input of the first mixer, signal input of the third mixer connected to the output of the first heterodyne, heterodyne input - output of the second local oscillator, and the output through the second filter with heterodyne input of the second mixer.

 

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