A Circuit for Improving Code Division Ranging Accuracy under Multi-User Conditions

Abstract

The invention provides a circuit for improving code division ranging precision in a multi-user condition. The circuit for improving code division ranging precision in a multi-user condition can solve the problem about ranging error drift. The circuit for improving code division ranging precision in a multi-user condition can be realized by the technical scheme: an interference target carrier wave passes through a frequency converter; one channel demodulates the interference target information through a dispreading device and takes the demodulated interference target information as the input for an interference cancellation module, and the other channel tracks and demodulates the interference target PN code through an interference target receiver; the obtained local PN code of the interference target is sent to an interference target regeneration base-band module together with the demodulation information, and compensate the delay caused by demodulation of the interference target information after through a fixed delay module 1, and then completes regeneration of the interference target baseband signal together with the demodulation information; the obtained local PN code of the interference target enters an adjustable delay module together with a delay correction module; the delay correction module can adjust the retardation of the adjustable delay module, and compares the relevant processing results after every time of adjustment and searches the maximum relevant output after traversing each retardation so as to obtain the optimum retardation; and the operation results output a baseband signal after interference elimination through the interference cancellation module.

Description

technical field [0001] The invention proposes a method for improving ranging accuracy under the condition of code division multi-users by using cancellation technology, and mainly relates to application fields related to code division multiple access ranging and the like. Background technique [0002] In the distance measuring system composed of the ranging machine and the transponder, the ranging machine transmits the ranging pseudo-code to the transponder, and the transponder captures and tracks the received pseudo-code, completes the regeneration of the receiving clock, and transmits the signal with the regenerated clock. Respond to the pseudo-code to the rangefinder, and the rangefinder also captures and tracks the received pseudo-code, and performs ranging by the time difference between the transmitted pseudo-code frame and the received pseudo-code frame. Commonly used ranging methods include pulse ranging and phase ranging. The pulse method has high pulse power and lo...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the above-mentioned technical problems, and propose an effective, stable and reliable circuit capable of eliminating multi-user interference and improving the accuracy of code division ranging under multi-user conditions, so as to solve the problem of ranging error drift

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