Distance measuring data processing method under incoherent measuring system

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...

AI Technical Summary

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

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