Method and apparatus for recognising a radar target
First Claim
1. A method of recognising a radar target comprising receiving radar returns from a scene and processing the returns to produce a Doppler spectrum characterised in that the method also includes processing the Doppler spectrum to produce a Doppler feature vector and using hidden Markov modelling (HMM) to identify the Doppler feature vector as indicating a member of a particular class of targets.
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Abstract
A method of recognizing a radar target comprises producing a sequence of Doppler spectra of radar returns form a scene and producing therefrom a sequence of Doppler feature vectors for a target in the scene. Hidden Markov modelling (HMM) is then used to identify the sequence of Doppler feature vectors as indicating a member of a particular class of targets. HMM is used to identify the sequence of Doppler feature vectors by assigning to each feature vector an occurrence probability by selecting a probability distribution or state from a set thereof associated with a class of targets, multiplying the occurrence probabilities together to obtain an overall probability, repeating for other probability distributions in the set to determine a combination of probability distributions giving highest overall probability for that class of target, then repeating for at least one other class of targets and selecting the target class as being that which yields the highest overall occurrence probability.
36 Citations
14 Claims
- 1. A method of recognising a radar target comprising receiving radar returns from a scene and processing the returns to produce a Doppler spectrum characterised in that the method also includes processing the Doppler spectrum to produce a Doppler feature vector and using hidden Markov modelling (HMM) to identify the Doppler feature vector as indicating a member of a particular class of targets.
- 8. Apparatus for recognising a radar target comprising a radar receiver for receiving radar returns from a scene and processing means for processing the returns to produce a Doppler spectrum characterised in that the processing means also includes means for processing the Doppler spectrum to produce a Doppler feature vector and hidden Markov modelling (HMM) means for identifying the Doppler feature vector as indicating a member of a particular class of targets.
Specification