A method of processing the ranging sound in fpga-based side tone ranging

Abstract

The invention discloses a method for processing ranging sounds in side tone ranging based on FPGA, which belongs to the field of electronic testing and measurement, and mainly uses FPGA to complete the generation of ranging sounds, the receiving of ranging sounds and the phase difference between transmitting and receiving sounds. calculate. The present invention adopts the dual-channel ranging sound processing technology, and uses the transmitting channel and the receiving channel of the main sound and the secondary sound with a low sampling rate of 2MSPS to work at the same time in the capture stage, which can solve the problem that the FPGA resources are difficult to meet when the Hz-level low-frequency original sound is restored, and at the same time Ensure that the capture of high-speed moving satellites does not produce phase ambiguity; in the tracking phase, the main tone transmitting channel and receiving channel with a high sampling rate of 100MSPS are used, and the single measurement accuracy can reach 10ns, which improves the tracking rate and measurement accuracy; the phase difference test of cycle average is adopted The method generates a phase difference, which reduces the complexity of calculating the phase difference between two single tones. This method is suitable for the realization of all sidetone ranging standards and has a wide range of applications.

Description

technical field [0001] The invention belongs to the field of electronic test and measurement, in particular to a method for processing ranging sounds in FPGA-based side tone ranging. Background technique [0002] At present, the side-tone ranging method and the pseudo-code ranging method are the two most commonly used ranging methods when measuring the distance between satellites and spacecraft on the ground. Among them, the side-tone ranging method has fast measurement speed and high test accuracy. , The required signal bandwidth is narrow, etc., and it is widely used in ranging. In the side tone ranging method, there are multiple ranging standards, including INMARSAT, ESA, ESA-like, etc. These ranging standards are based on the ranging sound for distance calculation, just for different measurement distances or In the application of testing speed, the frequency and number of ranging audio used are different. The side tone ranging method is to send the ranging tone at the ...

AI Technical Summary

Problems solved by technology

[0006] Existing side tone ranging methods based on FPGA are mainly realized by low sampling rate ranging sound or adopting different ways of processing primary and secondary sounds at the capture stage. These two methods are relatively simple and easy to implement in FPGA. However, there is a problem that the single-time ranging accuracy is not high. When the measurement accuracy needs to be improved, only a long-term average method can be adopted, resulting in too long measurement time, poor real-time performance when tracking and measuring the distance of high-speed satellites, and the difference between the main sound and the secondary sound. Simultaneous transmission is prone to problems such as phase ambiguity in the capture phase

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