Satellite-borne spread spectrum receiver and method for improving carrier wave capturing precision thereof

The invention discloses a method for improving carrier wave capturing precision of a satellite-borne spread spectrum receiver. Measurement and control work is completed through matching of the satellite-borne spread spectrum receiver and a ground measurement and control station, wherein the satellite-borne spread spectrum receiver comprises a power supply, an intermediate frequency processor and a radio frequency module, multichannel spread spectrum signals of the ground measurement and control station are received through the radio frequency module, the spread spectrum signals are transferred into intermediate frequency signals through the radio frequency module, the processes of digital downconversion, time domain parallel fast acquisition, threshold detection judgment, carrier frequency traversal searching and estimation after rough capturing are carried out on the intermediate frequency digital signals through the intermediate frequency processor, carrier wave frequency with a relative accurate spread spectrum signal is captured, estimated and obtained through a trigonometric interpolation method, the carrier wave frequency is supplied to a tracking unit of the intermediate frequency processor to achieve a fine capturing process, and therefore base band information is demodulated, and the uplink of the measurement and control communication between a satellite and the earth is established. More accurate capturing frequency values are calculated through an estimation method after the rough capturing, therefore, track locking time is shortened, and the work response speed of the satellite-borne spread spectrum receiver is accelerated.