MTI Radar

• US 4,617,568 A
• Filed: 06/13/1984
• Issued: 10/14/1986
• Est. Priority Date: 06/16/1983
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Mutoh, Norio
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/620,029
• Time in Patent Office: 853 Days
• Field of Search: 343/7.7
• US Class Current: 342/160
• CPC Class Codes: G01S 13/526 performing filtering on the whole spectrum without loss of range information, e.g. using delay line cancellers or comb filters G01S13/5244 takes precedence

Abstract

An MTI radar provided with a MTI processor which includes a single erasing circuit for erasing a vector signal due to a stationary target from among all the input vector signal of reflected waves both from a moving and a stationary target; and an arithmetic circuit for removing any other variations than ones from the moving target by calculating the inner product of the post-single-erasing vector signal and a pre-erasing vector signal.

Claims

1. An MTI radar provided with a MTI processor which comprises:

a single erasing means for erasing a vector signal received from a stationary target among a plurality of pre-erasing vector signals that include reflected waves received both from a moving and a stationary target producing a post-single erasing vector signal; and

arithmetic means for removing any other variations than variations from the moving target by calculating the inner product of the post-single-erasing vector signal and one of the pre-erasing vector signals.

2. The MTI radar as defined in claim 1, further comprising a means for decomposing said input vector signals into orthogonal components, and inputting same to the MTI processor.

3. The MTI radar as defined in claim 2, wherein said arithmetic means comprises a first arithmetic circuit for calculating the inner product of the vector signals, and a second arithmetic circuit for normalizing the inner product by the amplitude of the pre-erasing vector signal.

4. An MTI radar as defined in claim 3, wherein said first arithmetic circuit comprises a pair of multipliers whereby each of the orthogonal components of the post-single-erasing vector signal is multiplied by each of those in the pre-erasing state, and an adder for adding the outputs from the pair of multipliers.

5. An MTI radar as defined in claim 3, wherein said second arithmetic circuit comprises first multipliers whereby each of the orthogonal components in the pre-erasing state is multiplied by itself, first arithmetic unit which adds the outputs of said first multipliers and calculates the square root of the added value, and a second arithmetic unit whereby the output of the first arithmetic circuit is divided by the output of the first arithmetic unit.