An ultra-large dynamic, high-sensitivity spread spectrum measurement and control baseband receiving method and device

Abstract

The invention relates to the field of measurement and control navigation, and discloses an ultra-large dynamic and high-sensitivity spread spectrum measurement and control baseband receiving method, which comprises the following steps: a rough capturing stage: searching pseudo codes and frequency dimensions, and detecting an instant pseudo code phase and an information-modulated carrier frequency;a fine capturing stage: searching information edges, information combination and frequency dimensions, and detecting information edge positions and accurate carrier frequencies; code ring starting; afrequency locking stage: setting the cross-information integration duration of a tracking channel according to the fine capture frequency resolution; a phase locking stage: carrying out a Costas loopaccording to the frequency locking integration time length to calculate a locked carrier phase, and outputting matching module value information; a bit synchronization stage: a synthesis bit stream phase. The invention also provides a spread spectrum measurement and control baseband receiving device, which can realize the spread spectrum measurement and control baseband signal receiving with ultra-large dynamic, high sensitivity and multi-mode compatibility in a single FPGA (Field Programmable Gate Array) with limited resources, and meets the application requirements of multi-field ultra-large dynamic, high sensitivity and arbitrary information rate spread spectrum measurement and control baseband receiving.

Description

technical field [0001] The invention relates to a baseband receiving method and device for a spread spectrum measurement and control communication baseband with super large dynamics, high sensitivity and configurable arbitrary rate. It is suitable for the fields of radio spread spectrum ranging, speed measurement, measurement and control communication, including but not limited to spacecraft, aircraft and ground equipment. Background technique [0002] Spread Spectrum TT&C Communication System (Spread Spectrum TT&C System) is a covert measurement and control system developed rapidly in recent years. It has the characteristics of strong anti-interference ability, good confidentiality performance and code division multiple access. Its modulation method mostly adopts binary phase shift Keying (Binary Phase Shift Keying, BPSK), Quadrature Phase Shift Keying (QPSK) and their similar modulation methods, such as unbalanced quadrature phase shift keying (Unbalanced-QPSK), etc., spre...

AI Technical Summary

Problems solved by technology

[0009] The inadequacies of the existing classic spread spectrum measurement and control baseband receiving and processing architecture are mainly reflected in the following aspects. First, the single-mode acquisition algorithm cannot quickly detect the accurate synchronization code phase and carrier frequency under ultra-large dynamic conditions. Secondly, the acquisition cannot provide Approximately accurate information edge positions lead to false lock or loss of lock in the loop during capture and tracking, and then the tracking loop cannot break through the half-symbol integration time due to processing timing constraints, which reduces the sensitivity of receiving demodulation, and finally faces different spread spectrum measurement and control Due to the current status of different signal designs in application scenarios, the baseband receiving system cannot achieve high-performance and rapid porting applications

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