A shortwave prognosticator

Abstract

The invention relates to a short-wave pre-and-post-selector, which comprises a digital control circuit, transmitting-receiving switching circuits, band switching circuits, frequency hopping filters, a decoder, a broadband low noise amplifier and a receiving protection circuit, wherein the digital control circuit is electrically connected with an external short-wave radio station control unit through a control interface; serial codes sent by the short-wave radio station control unit are received by the digital control circuit and converted into parallel tuning codes respectively used for controlling the frequency hopping filters, the band switching circuits and the transmitting-receiving switching circuits so as to realize transmission on carrier signals different in frequency point and rapidly perform switching on carrier frequencies of useful signals; the transmitting-receiving switching circuits comprise a first transmitting-receiving switching circuit, a second transmitting-receiving switching circuit, a third transmitting-receiving switching circuit and a fourth transmitting-receiving switching circuit; the band switching circuits comprise a first band switching circuit and a second band switching circuit; the frequency hopping filters comprise a first frequency hopping filter and a second frequency hopping filter. The short-wave pre-and-post-selector disclosed by the invention has the advantages of being reasonable in structure, stable and reliable to use, strong in anti-jamming capability, low in cost, simple to control, fast in frequency hopping speed, low in power consumption, small in bottom noise and the like.

Description

technical field

[0001] The invention belongs to the technical field of digital tuning and frequency hopping, and in particular relates to a short-wave preselector. Background technique

[0002] With the development of frequency hopping technology, shortwave preselectors are widely used in military communication systems. It performs matching transmission for frequencies in the passband, and performs reflection attenuation for frequency mismatch in the stopband, thereby realizing signal spectrum filtering. The short-wave preselector is generally connected between the radio antenna switch and the RF amplifier, and is mainly used to improve the selectivity of the receiver. The preselector can effectively suppress out-of-band interference, improve and improve the receiver's electric field radiation sensitivity and other indicators, and ensure The receiver can work normally in complex electromagnetic environment. The short-wave post-selector is generally connected to the front en...

Examples

Embodiment Construction

[0018] like figure 1 As shown, the shortwave preselector of the present invention includes a digital control circuit 1, a transceiver conversion circuit 2, a band conversion circuit 3, a frequency hopping filter 4, a decoder 5, a broadband low noise amplifier 6 and a reception protection circuit 7.

[0019] The digital control circuit 1 is electrically connected with the external short-wave radio station control unit through the control interface 11, and the digital control circuit 1 is also electrically connected with the transceiver conversion circuit 2, the band conversion circuit 3 and the frequency hopping filter 4; wherein the digital control circuit 1 Receive the 2-bit serial code sent by the control unit of the shortwave radio station and convert it into an 11-bit parallel tuning code, respectively control the frequency hopping filter 4 by the control code in the 8-bit segment, and control the band conversion circuit 3 and the band conversion circuit by the 2-bit segmen...

technical field

[0001] The invention belongs to the technical field of digital tuning and frequency hopping, and in particular relates to a short-wave preselector. Background technique

[0002] With the development of frequency hopping technology, shortwave preselectors are widely used in military communication systems. It performs matching transmission for frequencies in the passband, and performs reflection attenuation for frequency mismatch in the stopband, thereby realizing signal spectrum filtering. The short-wave preselector is generally connected between the radio antenna switch and the RF amplifier, and is mainly used to improve the selectivity of the receiver. The preselector can effectively suppress out-of-band interference, improve and improve the receiver's electric field radiation sensitivity and other indicators, and ensure The receiver can work normally in complex electromagnetic environment. The short-wave post-selector is generally connected to the front en...

Examples

Embodiment Construction

[0018] like figure 1 As shown, the shortwave preselector of the present invention includes a digital control circuit 1, a transceiver conversion circuit 2, a band conversion circuit 3, a frequency hopping filter 4, a decoder 5, a broadband low noise amplifier 6 and a reception protection circuit 7.

[0019] The digital control circuit 1 is electrically connected with the external short-wave radio station control unit through the control interface 11, and the digital control circuit 1 is also electrically connected with the transceiver conversion circuit 2, the band conversion circuit 3 and the frequency hopping filter 4; wherein the digital control circuit 1 Receive the 2-bit serial code sent by the control unit of the shortwave radio station and convert it into an 11-bit parallel tuning code, respectively control the frequency hopping filter 4 by the control code in the 8-bit segment, and control the band conversion circuit 3 and the band conversion circuit by the 2-bit segmen...

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