Broadband rapid frequency measuring method based on cluster period phase process

Abstract

The invention discloses a broadband rapid frequency measuring method based on cluster period phase process. The method is characterized by comprising the steps of firstly regulating and shaping a measured signal and a reference signal so as to stabilize the measured signal through regulation and change the reference signal into a high frequency reference pulse suitable for being sampled through shaping; secondly carrying out standardization phase shift on the high frequency reference pulse, using the pulse subjected to phase shift and the original pulse as clocks of an AD converter for intensive sampling at the zero place so as to recover phase overlapping and information where error happens to the overlapping, and to control and process the phase detection information; then using the processed phase detection information as a switch signal for controlling a measuring gate, and carrying out gapless counting measurement of high resolution between the phase overlapping points; finally processing the gate time measuring information and displaying the frequency measurement result.

Description

technical field [0001] The invention relates to a broadband fast frequency measurement method based on group period phase processing. Background technique [0002] With the technological development of aerospace, laser ranging, precision positioning, particle flight detection and other high-tech fields, higher requirements are put forward for the measurement accuracy of frequency signals, especially high-frequency point-frequency signals. At present, there are many methods for frequency measurement, and the accuracy of frequency measurement mainly depends on the measured frequency range and the characteristics of the measured object. The accuracy that can be achieved in measurement depends not only on the accuracy of the frequency source used as a standard, but also on the measurement equipment and measurement methods used. Commonly used frequency measurement methods include direct counting method, multi-cycle synchronization method, analog interpolation method, and vernier...

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Problems solved by technology

[0019] (2) When the frequency of the measured signal is low

[0036] It can be seen that the multi-period synchronous frequency measurement method has made obvious progress compared with the direct frequency measurement method in the entire measurement frequency range, but it also has its disadvantages: first, it cannot perform continuous frequency measurement; Under the requirements of measurement, due to the requirement of higher measurement accuracy, a higher standard frequency must be used, which makes the number of digits counted by the standard frequency more (usually 24 or 32)

[0066] Although the above scheme has high measurement resolution, it can only measure point frequency signals, and cannot measure arbitrary signal frequencies in a wide frequency range, because the scheme is based on the equivalent phase detection frequency and the group phase law Therefore, it is difficult to form a measurement gate for signals with complex frequency relationships or large frequency differences. Not only the measurement rate is slow, but also when the frequency relationship is not fixed, the measurement will fail.

This scheme is only suitable for high-resolution measurement of point frequency signals with fixed frequency relationship and multiples of each other, and cannot realize fast high-resolution measurement of arbitrary signals in a wide frequency range

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