Doppler data processor with digital computing pulse rate filter

• US 3,912,915 A
• Filed: 05/01/1973
• Issued: 10/14/1975
• Est. Priority Date: 05/01/1973
• Status: Expired due to Term

• Current Assignee: Billy J. Mcclure, Donnie J. Inglish, Edward B. Harding, Frank L. Crosswy, Henry T. Kalb, Jim A. Mcclure
• Original Assignee: Billy J. Mcclure, Donnie J. Inglish, Edward B. Harding, Frank L. Crosswy, Henry T. Kalb, Jim A. Mcclure
• Inventors: Kalb, Henry T., Crosswy, Frank L., Harding, Edward B., McClure, Jim A., McClure, Billy J., Inglish, Donnie J.
• Primary Examiner(s): Malzahn, David H.
• Application Number:
  US05/356,269
• Time in Patent Office: 896 Days
• Field of Search: 235/156,152 343/5DP,8 328/167
• US Class Current: 708/307
• CPC Class Codes: G01S 17/50 Systems of measurement based on relative movement of target

Abstract

A doppler data processor apparatus utilizing a digital computing pulse rate filter for processing frequency burst type data produced by a laser doppler velocimeter.

Claims

1. A doppler data processor apparatus for processing frequency burst type data produced to a laser doppler velocimeter comprising in combination:

an analog filter unit to receive an output doppler data burst, said analog filter unit filtering said input doppler data burst to attenuate extraneous noise, said analog filter unit providing doppler burst data in response to said input doppler data burst, a sampling unit connected to said analog filter unit to receive said doppler burst data, said sampling unit providing a D pulse and a Delta pulse signal of four and eight doppler time periods respectively, a time base unit to provide clock pulses, and a digital pulse rate computing filter connected to said sampling unit to quantize the time interval of said D and Delta pulse signals, said digital pulse rate computing filter receiving said clock pulses to provide a time base, said digital pulse rate computing filter utilizing said time base and said time interval of said D and Delta pulse signals to establish predetermined doppler period limits, said digital pulse rate computing filter comparing the time interval difference between the D and Delta pulse signals with said predetermined doppler period limits, said digital pulse rate computing filter accepting valid doppler period data.

2. A doppler data processor as described in claim 1 wherein said digital pulse rate computing filter computing filter comprises in combination:

an A counter to receive and store said D pulse signal, said A counter having an output signal A, a B counter to receive and store said Delta pulse signal, and B counter having an output signal B, an adder unit receiving said output signals A and B, said adder unit processing said output signals A and B to provide a predetermined limit, said predetermined limit being the quantity (A-2B). a digital comparator to compare said doppler burst data with said quantity (A-2B), said digital comparator determining whether said doppler burst data is equal to, less than or greater than said predetermined limit, said digital comparator providing a control output signal, and a logic unit connected to said digital comparator to receive said control output signal, said control output signal being a recycle signal when said doppler burst data is equal to or less than said predetermined limit, said control output signal being an error reset signal when said doppler burst data is greater than said predetermined limit.