Communication link used for telemetry and telecontrol communication system

Abstract

The invention provides a communication link used for a telemetry and telecontrol communication system. An uplink broadcasing and downlink TDMA (time division multiple access) mode is adopted to solve the measurement and control problems of a single ground station for multiple aircrafts. A downlink adopts hybrid spread spectrum BPSK (binary phase shift keying) with multiple stages of adjustable gain for modulation, an uplink adopts coded spread spectrum QPSK (quadrature phase shift keying) with fixed gain for modulation, so that the anti-interference, anti-interception and anti-capturing capacity of a wireless link is improved, and asymmetry of the uplink and the downlink is considered. Both the uplink and the downlink adopt a single-pulse modulation symbol packet transmission mode, a fixed interval is inserted into every two adjacent symbol pulses, and accordingly, the spread spectrum signal capturing, tracking and synchronizing complication of receivers is reduced. Non-coherent demodulation is adopted, a complicated carrier synchronization problem is avoided, and the design and project realization of the receivers are further simplified. The complicated carrier synchronization problem is avoided, and wireless communication between a single ground station device and multiple telecontrol terminal devices is realized.

Description

technical field [0001] The invention belongs to the technical field of aircraft measurement and control communication, and in particular relates to a communication link used in a remote measurement and remote control communication system. Background technique [0002] The purpose of the aircraft measurement and control communication system based on ground station equipment is to establish a remote control data link for uploading control command information from the ground control station to the target aircraft and for downloading various airborne equipment from the target aircraft to the ground control station Telemetry data link for status information and payload generated payload. Such as figure 1 as shown, figure 1 It is a schematic diagram of aircraft measurement and control communication in the prior art. The traditional aircraft measurement and control communication system usually uses a single ground station to measure and control a single target aircraft, that is,...

AI Technical Summary

Problems solved by technology

[0003] As issues such as formation multi-aircraft measurement and control and unmanned aerial vehicle ground station system miniaturization and rapid deployment are raised, the limitations of traditional aircraft measurement and control communication systems appear: the use of "one station, one machine" for multi-aircraft measurement and control requires at least the same A large number of ground station equipment makes the ground station system huge and complex; for formation aircraft measurement and control, multiple ground station beams overlap, such as figure 2 as shown, figure 2 It is a schematic diagram of multi-target aircraft measurement and control in the one-station-one-machine measurement and control mode in the prior art; the FM pulse code modulation system must pass strict frequency division to solve the inter-link interference problem, and the spectrum utilization rate is low; the spectrum resources in the lower frequency band are tight, The limited channel bandwidth cannot meet the real-time delivery of large-scale telemetry data; there is a lack of effective anti-interference and anti-interception technical means; the long wavelength of the carrier leads to a large antenna size, and it is difficult to miniaturize the ground station and airborne equipment

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