Method and Device for Measuring Phase Noise of Microwave Receiver
A microwave receiver and phase noise technology, applied in receiver monitoring and other directions, can solve the problem of unsuitable measurement of phase noise of microwave receivers, and achieve the effects of high accuracy, ingenious conception and simple operation
Active Publication Date: 2020-12-25
HUNAN INST OF TECH
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[0004] At present, there are many techniques related to phase noise measurement, such as: direct spectrum analyzer method, frequency discrimination method, phase detection method, dual-channel cross-correlation method, etc. These methods have different characteristics and different scopes of application. However, they Both are test methods for measuring the phase noise of signal sources, which are not suitable for measuring the phase noise of microwave receivers. In the field of communication, there are no good standard methods and commercial instruments for measuring phase noise of microwave receivers.
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[0024] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.
[0025] In the prior art, according to the functional characteristics of the microwave receiver, it can be divided into four parts: microwave circuit, local oscillator source, mixer and intermediate frequency circuit. figure 1 is a structural block diagram of a typical microwave receiver, wherein the cable at the front end of the mixer 1, the adjustable amplifier 2, and the filter 1 constitute a microwave circuit, and the filter 2 and the adjustable amplifier 3 at the rear end of the mixer constitute an intermediate frequency circuit; The microwave circuit is used to transmit and process microwave signals; the local oscillator source is used to provide a single-frequency point oscillation sign...
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The invention provides a method and device for measuring the phase noise of a microwave receiver, and relates to the technical field of microwave communication. The method for measuring the phase noise of the microwave receiver comprises the following steps: firstly, uniformly dividing signals outputted by an auxiliary test source into an upper branch test signal and a lower branch test signal, transmitting the upper branch test signal into the microwave receiver of an upper branch to perform frequency conversion so as to output an upper branch intermediate frequency signal, transmitting the lower branch test signal into a lower branch to perform frequency conversion and phase shift so as to output a lower branch intermediate frequency signal, mixing the upper branch intermediate frequencysignal with the lower branch intermediate frequency signal, performing lowpass filtering, and finally performing Fourier analysis to obtain a phase noise value of the microwave receiver. The invention constructs the method and device for measuring the phase noise of the microwave receiver based on the microwave signal processing technology, so that the phase noise of the microwave receiver can beeffectively measured.
Description
technical field [0001] The invention relates to the technical field of microwave communication, in particular to a method and device for measuring the phase noise of a microwave receiver. Background technique [0002] Microwave communication systems have been widely used in the fields of communication, remote sensing and telemetry, radar, and precise measurement. Microwave receivers, as the core components of microwave communication systems, are crucial to the performance of the system. [0003] In the field of communication, phase noise (referred to as phase noise) is an important indicator of microwave receivers, and is often used to measure the degree of receiver interference to the carrier phase. Phase noise can be divided into two categories: phase noise of the signal and additional phase noise of the device or system. The phase noise of the device or system refers to the "transmission" or "processing" of the signal through the device or system (such as various radio fr...
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IPC IPC(8): H04B17/29
CPCH04B17/29
Inventor 洪俊俞斌彭志强刘海波王小虎张松华李祖林
Owner HUNAN INST OF TECH