1. A false lock filter circuit for a pulsed altimeter, the circuit comprising: a low pass filter having a relatively low bandwidth (LBW LPF) having an input coupled to receive a detector output; a low pass filter having a relatively high bandwidth (HBW LPF) having an input coupled to receive the detector output; and a false lock controller coupled to receive outputs from the LBW LPF and HBW LPF, the false lock controller configured to sample outputs of the HBW LPF and apply a statistical analysis to the samples to determine if a valid target has been detected.