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Method for measuring parameters of secondary radar echo pulses

An echo pulse and secondary radar technology, applied in pulse characteristic measurement, radio wave measurement systems, instruments, etc., can solve the problems of cumbersome measurement operations, complicated connections, and numerous peripheral test equipment, and achieve simplified equipment configuration and simple operation. , The effect of simplifying the complicated testing process

Active Publication Date: 2012-11-28
10TH RES INST OF CETC
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Problems solved by technology

Therefore, the existing test methods have the disadvantages of numerous peripheral test equipment, complex connections, cumbersome measurement operations, and manual calculation and judgment of measurement results.

Method used

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  • Method for measuring parameters of secondary radar echo pulses
  • Method for measuring parameters of secondary radar echo pulses
  • Method for measuring parameters of secondary radar echo pulses

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Embodiment Construction

[0013] refer to figure 1 . According to the present invention, at first the radio frequency echo pulse of the secondary radar is detected, and the signal strength detection function of the logarithmic amplifier is used to complete the signal detection to obtain the video pulse; The video pulse is converted into a differential signal, and the differential signal is sampled by a high-speed A / D with a working clock of 300MHz. After being quantized by the A / D code, it enters the FPGA for detection.

[0014] In the FPGA, the trigger pulse signal is detected at any time, and once the signal is detected, it starts counting with a 300MHz working clock. When the FPGA detects the video pulse quantized by A / D, it will record the number of counting pulses N, and at the same time clear the counter to wait for the next trigger pulse, and start counting again. Considering that the maximum repetition period of the radar signal is 10ms, in order to ensure that the counter does not overflow ...

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Abstract

The invention provides a method for measuring parameters of secondary radar echo pulses, which is simple, convenient and reliable in operation and accurate in measurement, is independent of universal instruments, and can be used for accurately measuring the secondary radar echo pulses. According to the technical scheme, the method provided by the invention comprises the following steps of: firstly, detecting the secondary radar echo pulses by a log amplifier to obtain video pulse signals; converting the video pulse signals into differential signals, and then carrying out A / D (Analog / Digital) sampling after the differential signals enter an A / D converter; detecting trigger pulse synchronization signals after putting A / D sampling data into an FPGA (Field Programmable Gate Array); computing the number of clocks by a counter in the FPGA to obtain aircraft distance parameters; submitting the sampling data to computer analysis processing software after being subjected to coding and framing; resolving pulse power and the aircraft distance parameters to obtain the various parameters of the secondary radar echo pulses; and reconstructing measured time domain waveform to a human-computer interface and displaying parameter output. According to the invention, the universal instruments such as an oscilloscope, a power meter and the like are reduced and the complicated test process is simplified.

Description

technical field [0001] The invention relates to a method for reconstructing the time-domain waveform of the secondary radar echo pulse and completing the precise measurement of the pulse parameters, which is mainly used in the ballistic measurement equipment outside the aircraft. Background technique [0002] In the launch test of the spacecraft range, the secondary radar cooperates with the ground radar station to complete the measurement, measurement and control task of the aircraft, which is an important part of the aircraft. Before the secondary radar is loaded with arrows, the test system must perform accurate time-domain analysis on the secondary radar forwarding pulse signal, including pulse rise time, fall time (tens of ns order), pulse width, pulse arrival time, and pulse delay As well as the secondary radar power reflected by the pulse parameters, etc., it is necessary to reconstruct the pulse in time domain and complete its precise parameter measurement. Such as ...

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Application Information

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IPC IPC(8): G01S7/40G01R29/02
Inventor 冷建明王勤果张昌菊
Owner 10TH RES INST OF CETC
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