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Method for inhibiting high power pulse radar band exterior transmission

A technology of pulse radar and out-of-band emission, which is applied in the direction of radio wave measurement systems, instruments, etc., can solve the problems of interference with electronic equipment, uselessness, radio frequency pollution, etc., and achieve the effect of simple circuit, small and flexible structure size

Inactive Publication Date: 2009-05-27
ANHUI SUN CREATE ELECTRONICS
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Problems solved by technology

[0003] At present, almost all pulse radars use a rectangular pulse modulation system, and the RF spectrum of an ideal rectangular transmitted pulse has the shape of (sinx) / x, such as figure 1 , energy other than 1 / t is useless to the radar system, and it will produce radio frequency pollution and interfere with other electronic equipment

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  • Method for inhibiting high power pulse radar band exterior transmission
  • Method for inhibiting high power pulse radar band exterior transmission
  • Method for inhibiting high power pulse radar band exterior transmission

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Experimental program
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Embodiment Construction

[0019] see Figure 2-3 .

[0020] The method of suppressing the out-of-band emission of high-power pulse radar is to remove the RF pulse input cable from the RF input end of the linear injection tube of the radar system, directly connect it to the input end of the narrowband bandpass filter, and then use a cable to filter the narrowband bandpass The output end of the device is connected to the RF input end of the linear injector.

[0021] Experimental data:

[0022] Experimental data one:

[0023] see Figure 4-5 .

[0024] For a pulse radar, the final launch tube is a klystron: the working frequency is 5430MHz, the pulse width is 1μs, and the peak output power is 250kW.

[0025] The output spectrum characteristics before the method of the present invention is not suppressed, such as Figure 4 :B -40dB About 100MHz; the bottom width of the spurious output is about 250MHz. The output spectrum characteristics suppressed by this method, such as Figure 5 :B -40dB About ...

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Abstract

The invention provides a method for inhibiting the out-of-band emission of high power pulse radar, which comprises the steps: arranging a narrowband band pass filter in the front of a linear injection tube; filtering the radio-frequency pulse input signal of the linear injection tube; inputting the filtered signal to the linear injection tube to be amplified. The method can apparently inhibit the pulse radar taking the linear injection tube as a final transmitting tube and output the useless frequency spectrum energy generated in the modulated process. By adopting filter technology in the low-power circuit of a radar system, the method of the invention can effectively control the output of useless frequency spectrum. A filter with small and flexible structure and size and convenient addition is a passive device which is not required to synchronize signal with the power supply, thus ensuring simple line. Even if the filter fails, the hardware devices of the radar system are free from loss, thus ensuring safety and reliability.

Description

Technical field: [0001] The invention relates to a pulse radar system using a vacuum launch tube, specifically a method for suppressing out-of-band emission of a high-power pulse radar. Background technique: [0002] With the development of science and technology in our country and the gradual construction of military power, radar is increasingly widely used in various civil and military fields. In order to make full use of limited spectrum resources, radar systems must take measures to control the output of useless spectrum. [0003] At present, almost all pulse radars use a rectangular pulse modulation system, and the RF spectrum of an ideal rectangular transmitted pulse has the shape of (sinx) / x, such as figure 1 , the energy other than 1 / t is useless to the radar system, and it will produce radio frequency pollution and interfere with other electronic equipment. [0004] In a modern microwave communication system, a bandpass filter is an important functional device that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/282
Inventor 范青
Owner ANHUI SUN CREATE ELECTRONICS