| Radar is widely used in military and civilian fields due to its excellent detection capability,and pulse compression radar is the most widely used type among numerous radar types.In pulse compression radar systems,pulse compression signals are typically used as the transmission signals,and pulse compression techniques are used for reception processing,enabling large-scale and highresolution target detection simultaneously.Therefore,linear chirp signals,as the most common pulse compression signals,have long been the focus of attention in terms of their generation and reception technologies.With the development of the times,the electromagnetic environment has become increasingly complex,causing the linear chirp signals of a single format and frequency band to no longer meet the requirements of modern radar for high-precision detection.At the same time,the increasing bandwidth of communication transmission and the diversification of radar functions have made the integration of radar and communication a trend in future development.This paper studies the generation and reception technology of linear chirp signals based on microwave photonics,proposes a photon generation technology for anti-dispersion power fading and multi-format chirp signals in response to the needs of multi-functional radar and multi-base station applications,and presents a microwave photonics radar-communication integration system architecture,providing a new solution for future radar-communication integration systems.The main contributions and innovations of this paper are as follows:1.In response to the needs of multi-functional radar and multi-base station applications,a photon generation scheme for anti-dispersion power fading and multi-format chirp signals is proposed,which can achieve free switching between multi-format chirp signals and can eliminate power fading caused by fiber dispersion.The scheme is subjected to detailed theoretical analysis,and the generation of upper,lower,and dual chirp signals with center frequencies of 15 GHz and 25 GHz,bandwidths of 1GHz,and time widths of 1 μs is simulated.The generation of upper,lower,and dual chirp signals with center frequencies of 2.5 GHz and 5.2 GHz,bandwidths of 500 MHz,and time widths of 1 μs is experimentally realized,and its anti-dispersion power fading capability is verified.The scheme has the advantages of unbiased control and optical filtering,compact structure,stable operation,and tunable frequency.2.A design of a microwave photonics radar-communication integration system is proposed,which uses binary phase-shift keying linear chirp continuous wave signals to achieve radar and communication functions in the same frequency band simultaneously,providing a potential solution for future radar-communication integration systems.The design scheme is subjected to detailed theoretical analysis and simulation modeling.At the signal generation end,binary phase-shift keying linear chirp continuous wave signals with a center frequency of 20 GHz,a bandwidth of 4 GHz are generated using photon doubling technology.At the radar reception end,the dechirping reception technology is used,and targets at distances of 0.6 m,0.9 m,1.5 m,and 1.8 m are effectively detected,verifying a radar distance resolution of 3.75 cm.At the communication reception end,demodulation recovery of 40 Mbit/s communication code element signals is achieved through mixing,matching filtering,and sampling decision-making.By changing the parameters of the input signal,tuning of the communication rate,detection distance,and distance resolution of the system is realized. |
