Spaceborne navigation receiver, zero value signal gain control method and storage medium

Abstract

The invention discloses a spaceborne navigation receiver, a zero-value signal gain control method and a storage medium. The zero-value signal gain control method is applied to a spaceborne navigation receiver. The spaceborne navigation receiver includes a radio frequency front end, an analog-to-digital converter, Digital-to-analog converters and signal processing blocks. The radio frequency front end is provided with an antenna for receiving the uplink analog signal; the analog-to-digital converter is electrically connected to the output end of the radio frequency front end, and is used to sample the uplink analog signal and the zero value analog signal output by the radio frequency front end and output the uplink digital signal and the second Zero-valued digital signal; the digital-to-analog converter is electrically connected to the input terminal of the radio frequency front-end, and is used to convert the first zero-valued digital signal into a zero-valued analog signal and output it to the radio frequency front-end; the signal processing module is connected with the analog-to-digital converter and the digital-to-analog The converter is electrically connected, and the signal processing module is used to receive the uplink digital signal and the second zero-value digital signal from the analog-to-digital converter, and output the first zero-value digital signal to the digital-to-analog converter.

Description

technical field [0001] The invention relates to the field of satellite communications, in particular to a satellite-borne navigation receiver, a zero-value signal gain control method and a storage medium. Background technique [0002] The satellite-borne navigation receiver is the core equipment to complete the communication between satellites and satellites and between satellites and the ground. It is the key equipment to ensure that the satellites are controlled by the ground. The stars are processed accordingly. Satellites move around the ground. For MEO (Medium Earth Orbit) satellites, the distance from the earth's surface is constantly changing, so the intensity of the ground signal received by the MEO satellite's onboard navigation receiver also changes accordingly. The received signal of the satellite-borne navigation receiver has a large dynamic range. Taking the Beidou satellite-borne navigation receiver as an example, the dynamic range of the received signal can r...

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Problems solved by technology

[0004] However, the zero-value signal also brings problems. Since the bandwidth and frequency points of the zero-value signal and the uplink signal are consistent, there will be mutual multiple access interference effects between the zero-value signal and the uplink signal, that is, the zero-value signal will affect The reception of the uplink signal and the uplink signal will also affect the reception of the zero value signal

In addition, due to the influence of satellites orbiting the earth, the uplink signal strength generally has a large dynamic range, and its dynamic range can reach 30dB. Assuming that at the lowest level of the uplink signal, the zero-value signal and the uplink signal can be received stably, if The strength of the zero-value signal does not change. When the uplink signal reaches the maximum level, it is equivalent to the zero-value signal facing a same-frequency broadband interference with a 30dBc interference-to-signal ratio strength, resulting in the failure of the zero-value signal to be received normally.

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