Method for acquiring and tracking telesignaling carrier wave under high dynamic

Abstract

The invention discloses a method for acquiring and tracking a telesignaling carrier wave under high dynamic. The method adopts a structure combining a frequency locked loop (FLL) and a phase locked loop (PLL) and utilizes the two-stage two-order FLL and the one-stage three-order PLL to acquire and track the signal carrier wave. By monitoring an input control signal of a loop voltage controlled oscillator (VCO), the band width of a loop filter is regulated in a self-adaption mode to meet needs of a frequency dynamic range of the signal carrier wave. The method can acquire and track the telesignaling carrier wave of a spacecraft under the high-dynamic condition, and the horizontal pitching position and the flying speed of the spacecraft can be measured. Therefore, the method has strong theoretical significance and wide application value.

Description

technical field [0001] The invention creates a high dynamic telemetry signal carrier acquisition and tracking method, which is suitable for capturing and tracking the telemetry signal carrier of a space vehicle under high dynamic conditions, so as to complete the measurement of the orientation and flight speed of the aircraft. Background technique [0002] Under high dynamic conditions, the carrier wave of the telemetry signal has the characteristics of large Doppler frequency and large change rate of Doppler frequency. Since the frequency-locked loop (FLL) has a larger dynamic range than the phase-locked loop (PLL), the PLL has higher tracking accuracy than the FLL. For the carrier capture and tracking problem under high dynamic conditions, the FLL is usually used to perform coarse capture on the carrier, so that the frequency difference is small to a certain threshold, and then switch to the PLL for fine capture, so as to achieve high-precision tracking of the carrier. In...

AI Technical Summary

Problems solved by technology

In order to make the FLL and PLL have a larger dynamic range, the bandwidth of the loop filter needs to be set larger, but in order to achieve higher tracking accuracy, the bandwidth of the loop filter needs to be set smaller. The loop filter bandwidth requirements are a set of contradictory

Images