TTL signal frequency hopping monitoring system and method

Abstract

The invention discloses a TTL signal frequency hopping monitoring method. The method is characterized in that the method comprises the following steps: the frequency doubling operation is performed on a reference clock to obtain a clock I; the frequency division operation is performed on a clock to be monitored to obtain a clock II; a trigger is controlled by the clock I to delay the clock II for N ns and 2N ns separately to obtain a clock III and a clock IV; the xor operation is performed on the clock III and the clock IV to obtain a clock V; counting is performed on the clock I by using a counter; when the clock V is in the high level state, the counter is cleared; when the clock V is in the low level state, the counter start to perform counting; when the rising edge of the clock V reaches, the counting value is latched; the latched counting value is delayed for a period through the clock V to obtain a value II; and comparison is performed between the latched counting value and the value II at each rising edge of the clock V so as to obtain a frequency difference value between the current period and the last period of the clock V, and if the difference value is greater than or equal to a given value, then the signal is hopped for one time. The system and method can be widely used in communications, radar and electronic countermeasure.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to a TTL signal frequency hopping monitoring system and method. Background technique [0002] With the rapid development of modern communication, radar and electronic countermeasure technology, in various complex electromagnetic environments, the count value of the counting frequency divider may jump, so it is necessary to test the sum of the number of jumps of the device in the complex electromagnetic environment , to calculate the reliability of the device in a complex electromagnetic environment. The first traditional test method is to use a spectrum analyzer to monitor, and when the frequency spectrum changes, it means that the count value of the frequency divider has a jump in the electromagnetic environment. During the test, expensive instruments and control software are required for counting; the second is to use a frequency meter for the test, which needs to accumu...

AI Technical Summary

Problems solved by technology

During the test, expensive instruments and control software are required for counting; the second is to use a frequency meter for testing, which needs to accumulate the number of pulses for a period of time during the test, which fails to achieve the purpose of real-time monitoring

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