Method and device for sending and receiving frequency sweep laser beacon

Abstract

The invented method consists of two parts: laser beacon transmission and the beacon receiving. The corresponding device includes the laser beacon emitter and the beacon receiver. The beacon receiver is a Faraday effect device for filtering. The laser beacon emitter uses the frequency sweep type semiconductor laser beacon emitter. The invention has the advantages of low power consumption, high output efficiency, easy to realize large power, more narrow bandwidth, visual field extended to 3 times, as well as simple structure, high automation degree and reliable operation etc.

Description

Technical field: [0001] The present invention relates to laser beacons, and more particularly to laser beacon transceivers. Background technique: [0002] Laser beacons are an important part and prerequisite of the space laser communication system, and they are a bridge for communication between the two parties, especially in satellite laser communication. Since the divergence of the communication laser beam is very small, the beacon is the satellite to find important symbol of the opponent. The atomic beacon invented by the United States in the mid-to-late 1990s is used in the STRV-2 satellite. The atomic beacon is composed of a beacon emitting laser and a beacon receiver. Because the optical filter in the beacon receiver adopts the Faraday effect The receiving bandwidth of the device is 2 orders of magnitude narrower than that of ordinary optical filters, so it realizes the large field of view reception under the condition of low-power transmitting beacons, which not only...

AI Technical Summary

Problems solved by technology

The atomic beacon invented by the United States in the mid-to-late 1990s is used in the STRV-2 satellite. The atomic beacon is composed of a beacon emitting laser and a beacon receiver. Because the optical filter in the beacon receiver adopts the Faraday effect The receiving bandwidth of the device is 2 orders of magnitude narrower than that of ordinary optical filters, so it realizes the large field of view reception under the condition of low-power transmitting beacons, which not only greatly reduces the search and capture time of both communication parties, but also improves the search and acquisition time. capture success rate, but because of the narrow receiving bandwidth, the laser Doppler frequency shift between the two high-speed moving satellites makes the frequency of the beacon laser fall outside the transmission band of the atomic filter, thus To make the beacon receiver unable to receive the beacon laser signal, the technology currently used is: dual-frequency emission of the laser and multi-peak transmission reception of the atomic filter. Although this method is technically simple, it uses two emitting lasers The frequency compensates for the four transmission peaks of the receiving atomic filter, so there is a disadvantage that the transmission rate changes under different Doppler frequency shifts, and there may be transmission dead spots at individual Doppler frequency shift points that affect the overall capture performance

In addition, the maximum frequency shift compensation of this Doppler frequency shift compensation technology is generally only about ±10 GHz, but the frequency shift of low-orbit-low-orbit satellite laser communication often exceeds ±10 GHz. Therefore, the Doppler frequency of the existing beacon system Frequency shift compensation technology cannot meet the requirements of Doppler frequency shift compensation for many satellite laser communications

Images