Comparison of pure and Doppler-coupled range measurements for prediction
Abstract
The Doppler-coupled range measurements obtained from linear FM pulses can give better range prediction accuracy than can uncoupled ('pure') range measurements, under certain conditions. Doppler-coupled range is equivalent to pure range extrapolated to a shifted time along the tangent to the range-vs-time curve. The time shift depends on the parameters of the FM ramp, not on the target. By appropriate choice of those parameters the prediction errors can be minimized. Formulas and curves are presented for comparison of errors due to noise and to acceleration when first-degree polynomial prediction is obtained from a pair of range measurements with and without Doppler coupling. Three types of pulse pairs are analyzed: uncoded pulses, Chirp pulses with opposite ramp slopes, and Chirp pulses with the same ramp slope. An extension to higher-degree polynomial prediction is also shown.
- Publication:
-
International Radar Conference
- Pub Date:
- 1980
- Bibcode:
- 1980inra.conf..421S
- Keywords:
-
- Chirp Signals;
- Doppler Effect;
- Prediction Analysis Techniques;
- Rangefinding;
- Error Correcting Devices;
- Frequency Modulation;
- Polynomials;
- Range Errors;
- Communications and Radar