Proceedings Article | 13 December 2024
KEYWORDS: Telecommunications, Microwave radiation, Photons, Design, Microwave photonics, Signal processing, Oscillators, Satellites, Satellite communications, Optoelectronics
Frequency hopping communication is a type of spread spectrum communication. It has the advantages of strong anti-interference ability, low interception probability, good confidentiality performance, and random access of multiple users. It has been widely used in military communications, electronic countermeasures, navigation, measurement and other fields. This technology controls the change of carrier frequency within a certain bandwidth through pseudo-random code, so as to disperse the enemy's interference power, thereby improving the system's anti-interference ability. Therefore, increasing the frequency hopping bandwidth is an important means to improve the performance of the frequency hopping communication system. Traditional military anti-interference satellite communication systems usually use microwave technology for on-board signal processing and forwarding. They are limited by the communication frequency band in terms of processing speed and transmission bandwidth, making it difficult to achieve multi-band, large bandwidth, and multi-granularity data transmission while taking into account the weight, volume and power consumption of the payload. This has become the biggest bottleneck for improving the anti-interference ability of the frequency hopping system[1]. Microwave photonics integrates the two major technologies of microwave and photon, and has the characteristics of wide working frequency band, large instantaneous bandwidth, no electromagnetic interference, flexible access, small size, and light weight. It is particularly suitable for ultra-wideband signal processing of satellite payloads. In the frequency hopping communication system based on the microwave photon , optical means are used to overcome the electronic bottleneck of the limited bandwidth of traditional microwave technology, which greatly improve the anti-interference performance of the frequency hopping communication system with multi-band and large bandwidth transmission, and provide a new idea for satellite communication anti-interference. In view of the limitations of the traditional microwave frequency hopping communication system, this paper explores the future new ultra-wideband frequency hopping anti-interference communication system based on microwave photons. First, the article analyzes the mechanism of improving the anti-interference and anti-interception performance of the frequency hopping system by the cross-band and ultra-wideband characteristics of microwave photon technology, and analyzes the impact of the broadband characteristics of microwave photon technology on communication signal processing. Then, this paper studies the architecture of the frequency hopping anti-interference satellite communication system based on microwave photons, and adopts a hybrid optoelectronic two-level ultra-wideband frequency hopping scheme to realize a multi-dimensional joint anti-interference architecture. On this basis, an adaptive anti-interference technology based on ultra-wideband spectrum measurement and interference avoidance is proposed, and the key adaptive anti-interference technologies adapted to ultra-wideband systems are explained in detail, including the key technologies of ultra-wideband satellite anti-interference system payload design, ultra-wideband interference prediction technology based on deep learning, adaptive interference avoidance technology, waveform design technology adapted to microwave photon ultra-wideband system, and ultra-wideband channel characteristic compensation technology. Finally, the development route of ultra-wideband frequency hopping technology based on microwave photons and the key and difficult problems to be solved are summarized and prospected, providing important theoretical reference and key technical support for the design of cross-band, ultra-wideband frequency hopping anti-interference communication systems.
