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The distance measurement data processing method under the non-coherent measurement system

A data processing and non-coherent technology, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve the problems affecting the ranging accuracy of the system, achieve simple and easy implementation, eliminate the problem of distance skipping, and occupy less FPGA resources Effect

Active Publication Date: 2016-07-06
10TH RES INST OF CETC
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Problems solved by technology

Generally, the pseudo-code clock is in the order of MHz, and the corresponding distance jump is in the order of m, which seriously affects the ranging accuracy of the system. For example, if the code rate is equal to 10Mcps, the corresponding distance jump value is 15m; if the code rate is equal to 20Mcps, the corresponding The distance jump value is 7.5m

Method used

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  • The distance measurement data processing method under the non-coherent measurement system
  • The distance measurement data processing method under the non-coherent measurement system

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Embodiment Construction

[0012] refer to figure 1 . In the following embodiments, the distance measurement data processing method of the non-coherent measurement system is realized by the digital circuit in the programmable gate array chip FPGA.

[0013] In the programmable gate array FPGA circuit of the transponder, the FPGA digital circuit divides the externally input digital intermediate frequency signal into two channels, one channel is sent to the uplink ranging pseudo code capture and tracking module to complete the uplink pseudo code synchronous tracking, and the other channel is synchronized with the synchronized Pseudo-codes are multiplied to complete the despreading function. The despread intermediate frequency signal is sent to the uplink carrier tracking loop for carrier synchronization and tracking, thereby obtaining data demodulation and bit synchronization signals from the output of the uplink carrier tracking loop, and extracting uplink frame synchronization according to the demodulat...

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Abstract

The invention provides a distance measuring data processing method under an incoherent measuring system. By the method, cycle skipping in distance measuring of the incoherent measuring and control system, and distance measuring precision of the system is guaranteed. According to the technical scheme, the method includes: in an FPGA (field programmable gate array) circuit of a responder, using digital circuits to perform capture tracking, carrier synchronization tracking, data demodulation, bit synchronization and frame synchronization to uplink pseudo codes; extracting frame count value from uplink demodulated data; using a pseudo code clock counting method to convert chip counting into bit counting, code cycle counting and code counting through simple mathematic conversion, using a double code clock sampling method with a phase difference of 180 degrees to perform sampling and time difference comparison to code counting and code phase sampling, distinguishing distance skipping value for algorithm correction, eliminating distance cycle skipping corresponding to code counting, filling pseudo distance information of the acquired uplink pseudo codes into downlink measuring frames in real time, and sending back to a ground measuring and control station to cooperatively complete incoherent distance measuring.

Description

technical field [0001] The invention relates to a distance measurement data processing method under a non-coherent measurement system in the field of measurement and control. Background technique [0002] In the measurement and control system, the transponder is a ranging method that measures the distance between the aircraft target and the ground station by measuring the round-trip delay of the signal, mainly including multi-side tone ranging, pseudo-random code ranging and sound code mixed ranging. In the measurement and control system, spread spectrum pseudo-code two-way pseudo-range measurement is usually used, and both uplink and downlink distance measurement adopt pulse code modulation-code division multiple access-binary phase shift keying (PCM-CDMA-BPSK), PCM-CDMA-BPSK It is independent from uplink remote control and downlink telemetry, uses code division multiple access, and shares the same carrier frequency point. The ground station in the non-coherent measurement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00
Inventor 陈霞
Owner 10TH RES INST OF CETC
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