Microwave Frequency Source Circuit and Its Signal Isolation Method for Main Oscillation Signal and Local Oscillation Signal
A technology of microwave frequency and local oscillator signal, which is applied in the field of microwave frequency source, can solve the problems of unable to effectively filter out mixing and intermodulation components and local oscillator leakage, reduce the volume and weight of the filter, and achieve a large degree of freedom and flexibility , reduce volume and weight, improve the effect of isolation
Active Publication Date: 2017-06-13
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology
[0003] The present invention provides a microwave frequency source circuit and a method for isolating the signal of the main oscillator signal and the local oscillator signal, which solves the problem that in the microwave frequency source circuit of the radar system, the frequency of the main oscillator signal is very close to the frequency of the received local oscillator signal, resulting in filtering The filter cannot effectively filter out the mixing and intermodulation components and the leakage of the local oscillator, improve the isolation between the transmitting main oscillator signal and the receiving local oscillator signal, and reduce the volume and weight of the filter
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[0026] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0027] The invention discloses a microwave frequency source circuit in a radar system and a method for isolating signals of a main vibration signal and a local vibration signal. When the Le frequency is within ±500 kHz, the frequency of transmitting the main oscillator signal is very close to the frequency of the receiving local oscillator signal, resulting in a very large filter volume at the main oscillator signal port and the local oscillator signal component becomes difficult to suppress. To solve this problem , The Doppler system radar disclosed by the present invention includes a microwave frequency source circuit for improving the isolation between the transmitted signal and the local oscillator signal.
[0028] Such as figure 1 As shown, it is a microwave frequency source circuit suitable for a Doppler system radar system, the circuit i...
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The invention discloses a microwave frequency source circuit, comprising: a local oscillator signal source, which outputs a local oscillator signal; a low-frequency voltage-controlled oscillator signal source, which outputs a low-frequency voltage-controlled oscillator signal; and the second auxiliary oscillation source, which respectively output the first auxiliary oscillation signal and the second auxiliary oscillation signal; the first-stage mixer, after mixing the received local oscillation signal and the first auxiliary oscillation signal, outputs the first down-conversion signal a second-stage mixer, which mixes the low-frequency voltage-controlled oscillator signal and the second auxiliary oscillator signal and outputs a second down-conversion signal; a second-stage mixer, which mixes the first down-conversion signal and the second down-conversion signal After the signal is mixed, the main vibration signal is output. The present invention introduces two coherent auxiliary oscillation sources to avoid the problem that each intermodulation component and the local oscillator signal component cannot be effectively filtered out at the main oscillation signal port due to the direct mixing of the received local oscillator signal and the low-frequency voltage-controlled oscillator signal. Isolation of the transmitting main oscillator signal and the receiving local oscillator signal.
Description
technical field [0001] The invention relates to a microwave frequency source technology, in particular to a microwave frequency source circuit in a radar system and a signal isolation method for a main vibration signal and a local vibration signal. Background technique [0002] In the Doppler system radar, since the echo signal and the transmitted signal differ by one Doppler frequency, and the Doppler frequency is often within ±500kHz, the frequency of the transmitted main oscillator signal and the frequency of the received local oscillator signal are very close. If the received local oscillator signal is directly mixed with a low-frequency VCO signal to generate the main oscillator signal, since the frequency of the local oscillator signal is very close to the frequency of the main oscillator signal, the volume of the filter at the main oscillator signal port is very large and the component of the local oscillator signal becomes In addition, as the size of the current rada...
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IPC IPC(8): H04B1/525
Inventor 苏坪杨冬何波蒋开创
Owner SHANGHAI RADIO EQUIP RES INST