Nano pulse signal acquiring method

Abstract

The invention relates to a nano pulse signal acquiring method. The novel acquiring method for nano pulse signals includes measuring the start and the end of a pulse to be measured in a sampling period in section and in group by matching an internal reference elapsed time clock with a sampling clock, dividing the pulse to be measured into a start section, a middle section and an end section, and obtaining the start pulse with and the end pulse width with high accuracy. Pulse counts t1, t2, t3, t4 and t5 at the front end and the rear end of the sampling clock can be accurately measured. An internal clock with high-frequency and high-accuracy chips is utilized as a reference clock, and the method of single chip integration guarantees miniaturization design of hardware and real-time of acquisition. The nano pulse signal acquiring method overcomes the defect that the front end and the rear end can not be acquired in a traditional method, and has high accuracy and real-time.

Description

technical field [0001] The invention relates to a method for collecting pulse signals with high precision requirements, in particular to a novel nanoscale pulse signal collection method. Background technique [0002] The pulse signal is a widely used signal and can be applied in many fields. For example, the inertial device widely used in the domestic strapdown inertial navigation system is an electromechanical inertial sensor. These sensors are generally equipped with an analog rebalance loop, and the loop output The analog signal is then quantized to obtain the pulse signal, so it is often necessary to collect the pulse signal in the strapdown inertial navigation system; at the same time, the output signal of the grating scale used in the environment requiring high-precision measurement is also a pulse signal, which needs to be The pulse signal is collected, and the frequency of this signal is often high, the pulse width can reach the nanometer level, and the required coll...

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Problems solved by technology

However, the higher the frequency, the higher the performance requirements of the chip. For example, when the measurement error of 1ns is required, the clock frequency needs to be increased to 1GHz. Selection, processing and many other issues

Second, a more advanced pulse acquisition method is to set two sets of gate valve pulse signals during the acquisition process. The pulse width of these two sets of gate valve signals is the same but there is a time delay of 90 degrees. The two sets of gate valve signals are respectively latched in the first half The count value of the pulse signal to be measured in the first half cycle and the second half cycle, and then the pulse number in a time period can be obtained by adding the pulse numbers of the two half cycles. Compared with the traditional method, this acquisition method has doubled, and has a certain Anti-interference, but this method has too much data processing in the face of high-frequency pulse signals and cannot be realized

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