Single-scan editor of bird echoes

Details Single-scan editor of bird echoes Single-scan editor of bird echoes

1988-11-03

1990-10-16

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Return signal controls radar system

Receiver

342105, 342159, G01S 13522, G01S 13536

Patent

active

049638882

ABSTRACT:
A single-scan editor of bird echoes uses range rate to aid in identifying bird echoes. The range rate is preferably calculated from change in phase between one interpulse period to the next interpulse period and both unfiltered and MTI filtered signals are used for the calculation of change in phase. The unfiltered phase difference is used if the logarithm of the total power of the phase difference exceeds a predetermined threshold during at least one of the interpulse periods and if not, the MTI filtered phase difference is used if the total power of the MTI filtered signal exceeds a corresponding predetermined threshold. If neither threshold exceeds the corresponding threshold, no calculation is made. Due to the relationship between phase difference and range rate, several possible range rates correspond to most phase differences. Therefore, an occurrence of each of the possible range rates is counted over the course of a cycle. The cycle covered is shifted one interpulse period at a time and the largest number of occurrences of sets of range rates for all such cycles are stored during the detection of a target. These largest number of occurrences are totaled to produce a total count which is used to produce a ratio of the largest number of occurrence of each of the sets of range rates to the total count. These ratios are individually compared with a threshold. If the threshold is exceeded an indication is produced that the target has a range rate within the set of range rates corresponding to bird speeds. In this case, the radar target data is edited to prevent display.

REFERENCES:
patent: 3787848 (1974-01-01), Laundry et al.
patent: 3972041 (1976-07-01), Howard
patent: 4529985 (1985-07-01), Sawyer et al.
patent: 4684950 (1987-08-01), Long

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