Minimum Time-Domain Tap Determination Algorithm Using Satellite Anti-Jamming Channel Characteristics

Abstract

Space-time adaptive processing (STAP) is a classic anti-interference algorithm for satellite navigation. In engineering applications, the number of time-domain taps of STAP not only determines the anti-jamming performance, but also determines the FPGA logic resource required for engineering implementation. In order to reduce application costs, it is urgent to predict the minimum number of time-domain taps required to achieve specified anti-interference indicators, so as to select the lowest cost FPGA chip. Unlike traditional dimensionality reduction algorithms such as Multistage Wiener Filter (MSWF), this paper proposes a method for determining the minimum number of time-domain taps without digital sampling data. To provide such a method, this paper construct an optimization problem and a solution method that determines the minimum number of time-domain taps based on the amplitude-frequency and phase-frequency characteristics of the specific receiver channels. Moreover, this method use interference to noise ratio (INR) to estimated minimum number of time-domain taps, which ensure the minimum number meet anti-interference performance. Finally, this paper verifies the effectiveness of the method through simulation by collecting amplitude-frequency and phase-frequency characteristics of 30 sets channels, and engineering test with three 2-element space time anti-jamming receivers.

Keywords

• Space-time adaptive processing
• receiver channel evaluation criterion
• determination of the number of time-domain taps