Spaceborne automatic gain switching phase-locked receiver

Abstract

The invention discloses a spaceborne automatic gain switching phase-locked receiver comprising a normal receiver body and an automatic gain amplifying device. The automatic gain amplifying device is arranged in front of the automatic gain amplifying device, and the automatic switching method is applied to the output power. Before received signals are locked, the automatic gain amplifying device is controlled to output small power, the loop phase discrimination gain is small, the loop bandwidth is small, and the signals are easy to lock; after the signals are locked, the automatic gain amplifying device is controlled to output large power, the loop phase discrimination gain is large, the loop bandwidth is large, the loop steady-state phase error is small, signal tracking is maintained easily, and the tracking sensitivity of the phase-locked receiver is improved. The large and small power output switching of the automatic gain amplifying device is controlled automatically through a switch according to locking indication signals. The phase-locked receiver is obtained through analog devices completely, circuits are simple and reliable, the steady-state phase error can be reduced, the loop dynamic performance and the receiver sensitivity can be improved, and the phase-locked receiver is particularly adaptive to the field of deep space exploration.

Description

technical field [0001] The invention relates to a space-borne phase-locked receiver, in particular to a space-borne phase-locked receiver with automatic gain switching. Background technique [0002] At present, the aerospace system can calculate the relative earth motion velocity of the satellite by measuring the Doppler frequency. Since the receiving power is very low, the Doppler frequency measurement is generally completed by a phase-locked receiver. The distance between the satellite and the ground station is constantly changing during the flight, and the signal power received by the antenna is not fixed. For example, during the flight of the lunar probe, the maximum received power can reach -50dBm. As the distance from the earth continues to increase, The received power will be lower than -125dBm, and the power range can vary by 75dB. Therefore, automatic gain switching is generally used in phase-locked reception to control the signal strength at a fixed level, which ca...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a phase-locked receiver with automatic gain switching on board to solve the problem of low sensitivity of the phase-locked receiver in the existing deep space exploration

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