Method for detecting wrong locking of downlink signal of deep space probe

The invention discloses a method for detecting wrong locking of a downlink signal of a deep space probe, and the method specifically comprises the following steps: 1, calculating the transmission time delay tsy of the downlink signal of the probe, and considering the wrong locking of the downlink signal if the downlink signal is locked on the ground before the time T0 + tsy; otherwise, turning to the step 2; 2, checking telemetering subcarrier locking conditions, locking carriers, and preliminarily judging that downlink signals are correctly locked if subcarrier locking time is less than 4-frame telemetering transmission time tau; otherwise, considering the carrier signal error locking possibility, and turning to the step 3; step 3, comparing a difference value between the Doppler actual measurement and the theory, if an absolute value of the difference value is greater than a limit value Kf, considering signal wrong locking, otherwise, turning to step 4; and step 4, comparing a difference value between the a