An integrated receiving system and method for radar and communication reconnaissance with adjustable gain

Abstract

The invention discloses a gain adjustable radar and communication reconnaissance integrated receiving system and method. Several antenna units are used to form a radar and communication reconnaissanceintegrated receiving array, and an RF output end of each antenna unit is connected to an RF exchange network. According to the reconnaissance of target radiation sources of different types and different power intensities, an auxiliary measurement branch completes the preliminary measurement of bandwidth and power, simple calculation is performed in a threshold comparison unit, an integrated receiving array sub-array RF combiner is adaptively adjusted, a reconnaissance receiving gain is changed, thus a level outputted by an integrated receiving array to a down-conversion receiving channel input port is always within a relatively reasonable range, the requirement of a large dynamic range from an integrated reconnaissance receiver is alleviated, the unified reception of extremely strong power radar and extremely weak power communication signals is satisfied, and the interception probability and parameter measurement performance of the integrated reconnaissance system are significantly improved.

Description

technical field [0001] The present invention proposes a gain-adjustable radar and communication reconnaissance integrated receiving system and method, which is suitable for the realization of reconnaissance, reconnaissance, communication and multi-functional integrated loads, and belongs to the field of radar communication and electronic warfare integration. Background technique [0002] In the future information warfare, with the development of technology, the threats faced by combat platforms are increasing, and the electromagnetic environment for their work is also becoming more and more complex. To improve survivability, combat platforms have to be equipped with more and more electronics. The increase of radar, communication and electronic countermeasure equipment not only consumes a lot of energy and occupies more space, but also weakens the maneuverability of combat platforms, increases the reflection area of ​​radar targets, and reduces the anti-jamming ability and C...

AI Technical Summary

Problems solved by technology

In order to achieve large dynamic reception, the existing radar reconnaissance and communication reconnaissance integrated equipment usually set a limiting amplifier or a straight-through / attenuator at the first stage of the RF front-end to achieve integrated reception of radar and communication signals to avoid receiving strong signals. When the power of the radar signal is high, the RF front-end is saturated and cannot work

This has the following disadvantages: the use of clipping operation at the front end will lead to clipping distortion when receiving large signals, which will increase the measurement error of signal parameters; after using the through / attenuator, the noise figure of the entire receiving link will increase sharply, The signal-to-noise ratio of the receiver output is reduced, and the performance of signal parameter measurement is also reduced.

Moreover, this does not solve the integrated reception and processing of radar strong power signals and communication weak power signals. At present, a fixed-gain reconnaissance antenna is usually used for several key targets to ensure its effective reconnaissance and processing.

In this way, for the long-range early warning radar signal with extremely strong radiation power or the communication signal with extremely low rate and extremely weak power, unified and effective detection cannot be achieved, and it can only be discarded, which seriously weakens the performance of the detection system.

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