The invention discloses a radar work channel acquisition system based on two-stage digital down conversion. A radio frequency direct sampling module obtains radar echo digital signals including n channels, and a digital orthogonal frequency mixing module obtains baseband digital signals including n channels; a half-band filter module obtains the baseband digital signals including n channels after the first stage of digital down conversion, and a data transmitting interface module obtains frame data; a radar parameter information module is used for providing parameter information of the current radar work channel; the corresponding frequency mixing control word is outputted of a channel mapping table module, and a data receiving interface module acquires the baseband digital signals including n channels after the first stage of digital down conversion and corresponding to the frame data; and the frequency-variable digital orthogonal frequency mixing module obtains the baseband digital signals of which the work channel is at zero frequency after digital orthogonal frequency mixing, and a multiphase extraction filter module obtains the baseband digital signals only including the work channel after the second stage of digital down conversion and then outputs the baseband digital signals to a data transmitting optical fiber module to be outputted.

Radar work channel acquisition system based on two-stage digital down conversion and method thereof

The present invention discloses a dual-band four-channel responder microwave link test device. The device comprises a directional coupler A (1), a directional coupler B (2), a directional coupler C (3), a detector A (4), a detector B (5), a detector C (6), a power divider A (7), a power divider B (8), a power divider C (9), a signal circulation branch 1, a signal circulation branch 2, a circulatorA (20), a circulator B (21), an attenuator A (22) and an attenuator B (23), wherein the signal circulation branch 1 and the signal circulation branch 2 are the same in structure and are respectivelyformed by a plurality of adjustable attenuators and isolators. The device ensures the test of the dual-band four-channel responder antenna switching function and solves the test problem that a traditional microwave link test device cannot meet the dual-band four-channel responder.

Dual-band four-channel responder microwave link test device

The utility model provides a digital high frequency radar receiver of multifrequency multichannel based on multiplex mode, including transmission signal synthesis part, receiving part, clock subtotal PC, transmission signal synthesis part is including consecutive numerical control vibration module, digital analog conversion module and wave filter module, receiving part includes consecutive wave filter, analog -to -digital conversion module, digit frequency conversion module, USB data transmission module down, clock part respectively with numerical control vibration module, digital analog conversion module, receiving part's the analog -to -digital conversion module of transmission signal synthesis part, frequency conversion module, USB data transmission module link to each other the numeral down. The USB data transmission module links to each other with the PC. The utility model discloses analog circuit is few, and digit frequency conversion module down adopts the time division multiplex mode, has effectively saved hardware resource, and small, internal noise is little, and the passageway uniformity is good, and the platform commonality is strong.

Digital high frequency radar receiver of multifrequency multichannel based on multiplex mode

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Digital high frequency radar receiver of multifrequency multichannel based on multiplex mode