Systems and methods for using velocity measurements to adjust Doppler filter bandwidth are provided herein. In certain embodiments, a method for adjusting bandwidth for at least one Doppler filter in a Doppler beam sharpened radar altimeter comprises receiving a velocity measurement; adjusting the bandwidth of the at least one Doppler filter based on the velocity measurement; and transmitting a radar beam, wherein the radar beam is aimed toward a surface. The method further comprises receiving at least one reflected signal, wherein the at least one reflected signal is a reflection of the radar beam being reflected off of at least one portion of the surface; and filtering the at least one reflected signal with the at least one Doppler filter to form at least one Doppler beam.

A method for correcting Doppler shift-based speed measurements of a projectile where the correction is based upon a two-parameter model for the projectile speed. In one example application, the method is used for correcting the well-known cosine measurement error endemic in Doppler shift-based speed measurements is accomplished by comparing the received projectile speed data with parametric curves that are computed in a low-cost microprocessor, and selecting a set of two parametric curves that bound the received projectile data within a sufficiently narrow parametric range so that the initial projectile speed can be computed with the desired accuracy.

A systems of sensors used for navigation in which the system performs real-time dynamic adjustments of the sensor configuration including scan pattern and sensor output characteristics. For an airborne radar system, the radar system may adjust the scan pattern and/or adjust the waveform characteristics based on the phase of flight. Radar waveform characteristics may include frequency, chirp length, modulation type, dwell duration and other characteristics. The scan pattern and radar beam direction may be based on any combination of the transmit beam, or transmit beams, as well as adjustments to receive beams, e.g., by digital beam forming done by signal processing circuitry of the radar system. Similar techniques may also be applied to other sensors or combinations of sensors such as sonar, lidar, visual, infrared, and other sensors.